KR102005670B1 - Laminate film for bonding, manudacturing method thereof and light transmitting layered product comprising of the same - Google Patents

Abstract

One embodiment of the present invention relates to a laminated film for bonding, which has a first end and a second end disposed to face the first end. According to one embodiment of the present invention, the laminated film for bonding comprises: a base layer containing polyvinyl acetal resin, sharing one surface with the first end, and having a shape with the thickness gradually increased toward the first end; and a reinforcement layer sharing one surface with the second end and having a shape with the thickness gradually decreased toward the second end. A sectional shape of the laminated film cut along a straight line connecting one point of the first end with one point of the second end is a polyhedral shape in which the thickness of the first end is greater than that of the second end. Accordingly, the laminated film provides excellent anti-shock, anti-penetration, and soundproof properties when being bonded with glass, thereby being used for a head-up display (HUD).

Description

TECHNICAL FIELD The present invention relates to a laminated film for lamination, a method for producing the laminated film, a laminated film for lamination, a method for producing the laminated film, and a light-

The present invention relates to a laminated film for bonding having a triangular or trapezoidal cross section, a method for producing the laminated film, and a light transmitting laminate usable as a windshield therefor, which is excellent in impact resistance and ductility, And a laminated film for bonding having a sufficient strength and a sufficient thickness and a sufficient strength.

Polyvinyl acetal is used as an intermediate layer of laminated glass (safety glass) or a light-transmitting laminate. The laminated glass is mainly used for windows, exterior materials and automobile window glass of a building. It does not scatter even when broken and does not allow penetration even with a certain intensity of impact. It is applied to an object or person located inside It is possible to secure stability that can minimize damage or injury.

Recently, automobiles are increasingly equipped with a head-up display (HUD). Specifically, when an image is projected onto a car windshield with a projector in the dashboard area or the loop area, the manner in which the projected image is perceived by the driver is applied. Such a front display device can obtain important data such as current driving information, navigation information and warning message at the same time while watching the road ahead of the driver, thus contributing to convenience of driving and traffic safety considerably.

The front display device reflects the image on both front and rear surfaces of the windshield as the projector image is projected onto the car windshield so that the driver can see both the desired primary image as well as the ghost image ) Are also perceived together with the basic problem. One way to solve this problem is to apply a wedge-shaped vertical cross section to the middle layer between the glasses.

However, such a wedge-type intermediate layer has a problem in that it does not satisfy sufficient impact resistance and puncture resistance performance required for automobile glass at a thin thickness, and does not sufficiently satisfy characteristics such as noise shielding.

The above-described background technology is technical information that the inventor holds for the derivation of the present invention or acquired in the process of deriving the present invention, and can not necessarily be a known technology disclosed to the general public prior to the filing of the present invention.

Korean Registration No. 10-1310022, wedge-shaped polymer intermediate layers for reducing sound Korean Patent Publication No. 10-2017-0131238, a laminated glass including a functional film

An object of the present invention is to provide a wedge-shaped multilayer film excellent in impact resistance and penetration resistance. Another object of the present invention is to provide a multilayered film having a sufficient sound-shielding property and a sufficient thickness to have a sufficient thickness.

In order to achieve the above object, a laminated film for bonding according to an embodiment of the present invention is a laminated film having a first end and a second end opposite to the first end, A base layer having a shape including a resin and having a thickness gradually getting closer to the first end; And a reinforcing layer having a thickness gradually becoming thicker toward the second end.

The reinforcing layer comprises an ionomer, a polyethylene terephthalate resin, or a polyimide resin.

Wherein the shape of the cross section of the laminated film cut along a straight line connecting one point of the first end and one point of the second end is such that the thickness at the first end is larger than the thickness at the second end Which has a larger value than the thickness of the triangular or trapezoidal shape.

Wherein the shape of the cross section of the laminated film is a triangular or trapezoidal shape having a bottom surface with a line corresponding to the thickness at the second end and a triangular or trapezoidal shape having a line corresponding to the thickness at the second end, And may include a cross-section of the reinforcing layer.

The base layer may further comprise a functional layer.

The functional layer may be located inside the base layer and not directly contact the reinforcing layer.

The functional layer may share one surface with the outer surface of the base layer and directly contact one surface of the reinforcing layer.

The functional layer may be one having sound insulation functionality.

At the first end, the base layer and the enhancement layer may have a thickness ratio of 10: 0 to 2.

At the second end, the reinforcing layer and the base layer may have a thickness ratio of 10: 0 to 4.

The base layer excluding the functional layer and the functional layer at the first end may have a thickness ratio of 1: 3 to 10.

The thickness of the second end may be less than 0.38 mm.

The thickness of the first end may be 0.95 mm or less.

The thickness at the first end may be 0.2 mm or more thicker than the thickness at the second end.

The laminated film for bonding may be one that satisfies the impact resistance property based on KS L 2007: 2008.

The lamination film for bonding may be one which satisfies the endurance characteristic according to KS L 2007.

A method for producing a combined laminated film according to another embodiment of the present invention includes the steps of extruding a composition for forming a base layer containing a polyvinyl acetal resin in a base layer extruding port and a step of extruding a composition for forming a base layer, A step of extruding a composition for forming a reinforcing layer comprising a phthalate resin or a polyimide resin; The coextruded composition for forming a base layer and the composition for forming a reinforcing layer are moved to a feed block and have a first end and a second end located in a direction perpendicular to an extrusion direction, A base layer having a thickness gradually increasing toward the first end and a reinforcing layer having a thickness gradually increasing toward the second end of the composition for forming a reinforcing layer, And a molding step for producing the molded article.

Wherein the lamination film for bonding has a shape in which the cross-sectional shape of the laminated film cut along a straight line connecting one point of the first end and one point of the second end is larger than a thickness at the first end A triangular or trapezoidal shape having a larger value.

The co-extruding step may further include pneumatically dispensing a composition for forming a functional layer containing 54 to 76% by weight of a polyvinyl acetal resin and 24 to 46% by weight of a plasticizer. At this time, in the forming step, the lamination film for bonding may further form a functional layer inside the base layer or between the reinforcing layer and the base layer.

A light-transmitting laminate according to another embodiment of the present invention includes a first light-transmitting layer; A laminated film for bonding according to an embodiment of the present invention which is positioned on one side of the first light transmitting layer; And a second light transmitting layer positioned on the lamination film for bonding.

The first light-transmitting layer and the second light-transmitting layer may be independently light-transmitting glass or light-transmitting plastic.

In order to achieve the above object, a laminated film for bonding according to an embodiment of the present invention is a laminated film having a first end and a second end opposite to the first end, the polyvinyl acetal resin A base layer having a thickness that gradually increases from the first end to the first end; And a reinforcing layer sharing a side of the second end and having a thickness gradually becoming thinner toward the second end, wherein the reinforcing layer has a point at a first end and a point at a second end The shape of the section of the laminated film cut along the straight line connecting the two ends is a polygonal shape having a thickness at the first end greater than a thickness at the second end.

The reinforcing layer may include a first reinforcing layer and a second reinforcing layer.

The first reinforcing layer may contain a resin for reinforcing layer which is one surface with the second terminal and is an ionomer, a polyethylene terephthalate resin, or a polyimide resin.

The second reinforcing layer may contain the polyvinyl acetal resin and the resin for the reinforcing layer, which are located between the base layer and the first reinforcing layer and are non-uniformly mixed with each other.

The base layer may further include a functional layer located inside the base layer.

The functional layer may be one having sound insulation functionality.

Wherein the shape of the cross section of the laminated film has a first end, a first side where one end is connected to the first end and a second end is connected to the second end, a second end, and one end is connected to the second end And the other end is connected to the first end, and the angle ( ₂ ) formed by the first surface and the plane parallel to the second surface at the second end is 1 to 4 mrad Can be.

Wherein the shape of the cross section of the laminated film has a first end, a first side where one end is connected to the first end and a second end is connected to the second end, a second end, and one end is connected to the second end And a second end connected to the first end is connected to the first end, and an angle (? ₁ ) formed by the first end and a plane parallel to the second end at the first end is 0.5 to 0.8 mrad Lt; / RTI >

The correction area P, which is a portion corresponding to one surface of the second reinforcing layer, may have a surface roughness of 30 to 90 탆 among the first surface or the second surface.

The height H ₅₀₀ of the reinforcing layer, which is a distance between one point of the second end to which the reinforcing layer is in contact and one point of the reinforcing layer that is the farthest from the second end, may be 1 to 250 mm have.

The thickness of the second end may be less than 0.38 mm.

The thickness at the first end may be 0.2 mm or more thicker than the thickness at the second end.

The laminated film for bonding may be one that satisfies the impact resistance property based on KS L 2007: 2008.

The lamination film for bonding may be one which satisfies the endurance characteristic according to KS L 2007.

A method for producing a laminated film for bonding according to another embodiment of the present invention comprises the steps of extruding a composition for forming a base layer containing a polyvinyl acetal resin in a base layer extruding port, Extruding a composition for forming a reinforcing layer comprising a terephthalate resin or a polyimide resin; The coextruded composition for forming a base layer and the composition for forming a reinforcing layer are moved to a feed block and have a first end and a second end located in a direction perpendicular to an extrusion direction, And a composition for forming a reinforcing layer, wherein the base layer has a shape that gradually increases in thickness as the first end is closer to the first end and the first end shares the first end, And a forming step for producing a laminated film for bonding comprising a reinforcing layer having a shape in which the thickness gradually becomes closer to the second end.

Wherein the lamination film for bonding has a shape in which the cross-sectional shape of the laminated film cut along a straight line connecting one point of the first end and one point of the second end is larger than a thickness at the first end It is a polygonal shape having a larger value.

Wherein the coextruding step further comprises pneumatically delivering a composition for forming a functional layer containing 54 to 76% by weight of a polyvinyl acetal resin and 24 to 46% by weight of a plasticizer, And further forming a functional layer inside the base layer.

A light-transmitting laminate according to another embodiment of the present invention includes: a first light-transmitting layer; A laminated film for bonding described above which is located on one side of the first light transmitting layer; And a second light transmitting layer positioned on the lamination film for bonding.

The laminated film for bonding according to the present invention and the light-transmitting laminated body comprising the laminated film have excellent soundproofing properties with a thin thickness while being excellent in impact resistance and ductility. Further, the light-transmitting laminated body including the laminated film for bonding of the present invention does not form a double image even when projecting display information using a projector, and thus its application to a front display system is also great.

The method for producing a laminated film for bonding according to the present invention can produce a laminated film having a laminated structure having an asymmetric specific cross-sectional shape by producing a laminated film having a triangular or trapezoidal cross section in a coextrusion manner.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a light-transmitting laminate produced according to an embodiment of the present invention. FIG.
2 is a conceptual view illustrating a cross-sectional view of a light-transmitting laminated body manufactured according to an embodiment of the present invention and a front display /
3 is a conceptual view illustrating a cross-sectional structure of a laminated film for bonding manufactured according to another embodiment of the present invention.
4 is a conceptual view illustrating a cross-sectional structure of a laminated film for bonding manufactured according to another embodiment of the present invention.
5 is a conceptual view illustrating a cross-sectional view of a light-transmitting laminate manufactured according to an embodiment of the present invention and a front display /
6 (a) and 6 (b) are conceptual diagrams illustrating a cross-sectional structure of a laminated film for bonding according to another embodiment of the present invention;
7 is a conceptual view for explaining a cross-sectional structure of a laminated film for bonding manufactured according to another embodiment of the present invention (a: height of the reinforcing layer, and b is an angle).
Fig. 8 is a conceptual view for explaining each section divided when evaluating endurance and impact resistance in an experimental example of the present invention. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like parts are designated with like reference numerals throughout the specification.

The terms "about "," substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation of, or approximation to, the numerical values of manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

Throughout this specification, the term "combination thereof " included in the expression of the machine form means a combination or combination of at least one element selected from the group consisting of the constituents described in the expression of the form of a marker, And the like.

Throughout this specification, the description of "A and / or B" means "A, B, or A and B".

Throughout this specification, terms such as "first", "second" or "A", "B" are used to distinguish the same terms from one another, unless otherwise specified.

In this specification, the position of B on A means that B can be located on A or on A, and B can be located on B or other layer between B and A, And is not interpreted.

In this specification, the singular < RTI ID = 0.0 > terms < / RTI > are to be interpreted as including the singular or plural unless context dictates otherwise.

In the present specification, the sizes of the respective constituent elements may be exaggerated for explanatory purposes of the invention, and may differ from the actually applied size.

The inventors of the present invention have found that when a wedge-shaped bonding film is formed, the thickness of the bonding film is inevitably reduced. When such a bonding film is applied to a laminated glass, It has been recognized that there is a problem that the properties related to the stability of the tempered glass such as penetration are worsened, and while studying a method for solving these problems, it is possible to solve such a problem by applying a heterogeneous resin to a specific structure And completed the present invention.

FIG. 1 is a schematic view for explaining a top view of a light transmitting laminate 700 manufactured according to an embodiment of the present invention, FIG. 2 is a schematic view illustrating a light transmitting laminate 700 manufactured according to an embodiment of the present invention, And FIG. 4 is a conceptual view illustrating a cross-sectional structure of the laminated film for bonding 100 manufactured according to another embodiment of the present invention . Hereinafter, the present invention will be described more specifically with reference to Figs.

A laminated film 100 for bonding according to an embodiment of the present invention is a laminated film having a first end 120 and a second end 140 facing the first end, A base layer 300 having a thickness gradually increasing toward the first end 120; And ii) a reinforcing layer (500) having a thickness gradually getting thicker toward the second end (140).

The bonding laminated film 100 has a thickness T ₁₂₀ at the first terminal end and a thickness T ₁₄₀ at the second terminal end, Sectional shape cut along a straight line connecting one point B of the second end to each other is a triangular or trapezoidal shape.

Thus, the lamination film 100 for bonding has a wedge-shaped overall shape in which the first end 120 is thicker than the second end 140 (see FIG. 2) ).

The cross-sectional shape of the laminated film 100 may be a cross-sectional shape of a base layer 300 having a triangular or trapezoidal shape with a bottom corresponding to a thickness at the first end 120, And a cross-section of the reinforcing layer 500 having a triangular or trapezoidal shape with the corresponding line as the underside.

One surface of the reinforcing layer 500 except the bottom surface thereof may be in contact with one surface of the base layer 300 except the bottom surface thereof.

One surface of the reinforcing layer 500 excluding the bottom surface thereof may be located on one surface of the base layer 300 except the bottom surface thereof.

Other functional layers may be disposed between one surface of the reinforcing layer 500 excluding the bottom surface thereof and one surface of the base layer 300 except the bottom surface thereof. Specifically, a shade band layer or the like can be located.

The base layer 300 may further include a functional layer 400 disposed therein or between the reinforcing layer 500 and the base layer 300 (see FIGS. 3 and 4).

The functional layer 400 may be located inside the base layer 300 and may not be in direct contact with the reinforcing layer 500.

The functional layer 400 may share one surface with the outer surface of the base layer 300 and may directly contact at least a part of the surface of the reinforcing layer 500.

As the functional layer 400, a sound insulating layer may be specifically used.

At the first end 120, the base layer 300 and the enhancement layer 500 may have a thickness ratio of 10: 0 to 2. Specifically, at the first end 120, the base layer 300 and the enhancement layer 500 may have a thickness ratio of 10: 0 to 1.3, and the base layer 300 and the enhancement layer 500) may have a thickness ratio of 10: 0.1 to 1.3.

Means that the thickness T ₅₀₀ of the reinforcing layer at the first end 120 is zero with respect to the base layer thickness T ₃₀₀ is substantially equal to the thickness of the reinforcing layer 120 at the thickness of the first end 120. [ (500) does not exist. The thickness of the reinforcing layer 500 is gradually increased as the reinforcing layer 500 is closer to the second end 140 with respect to the cross section (section cut along the AB). As the reinforcing layer 500 is closer to the first end 120, The reinforcing layer 500 contacting the second end 140 has a bottom surface and has a triangular shape in which the end of the reinforcing layer 500 contacts or contacts the first end 120 as a vertex of the reinforcing layer 500 .

The first means at the terminal 120 is not a zero-thickness (T ₅₀₀₎ of the enhancement layer relative to the base layer thickness (T ₃₀₀₎ 10 substantially above in terms of the thickness (T ₁₂₀₎ of the first end It means that the reinforcing layer 500 is partially present. The thickness of the reinforcing layer 500 is gradually increased as the reinforcing layer 500 is closer to the second end 140 with respect to the cross section (section cut along the AB). As the reinforcing layer 500 is closer to the first end 120, Means that the reinforcing layer 500 contacting the second end 140 has a bottom face and the reinforcing layer 500 contacting the first end 120 has a trapezoidal shape as an upper face.

At the second end 140, the reinforcing layer 500 and the base layer 300 may have a thickness ratio of 10: 0 to 4. Specifically, at the second end 140, the base layer 300 and the enhancement layer 500 may have a thickness ratio of 10: 0 to 3.3, and at the second end 140, the base layer 300 300 and the reinforcing layer 500 may have a thickness ratio of 10: 0 to 2.5, and may have a thickness ratio of 10: 0.1 to 2.5.

The second is the base layer thickness at the ends (140) (T ₃₀₀₎ the enhancement-layer thickness (T ₅₀₀₎ the sense of zero on the basis of 10 is substantially the thickness of the second end (T ₁₄₀₎ the base in the surface It means that layer 300 is not present. The thickness of the base layer 300 is gradually increased as the base layer 300 is closer to the first terminal 120 and the thickness of the base layer 300 is gradually decreased as the base layer 300 is closer to the second terminal 140 The base layer 300 contacting the first end 120 has a bottom face and the end of the nearest position contacting or contacting the second end 140 has a triangular shape having the base layer 300 as a vertex .

The meaning that the thickness T ₃₀₀ of the base layer at the second end 140 is not 0 based on the thickness T ₅₀₀ of the reinforcing layer is substantially equal to the thickness T ₁₄₀ of the second end Which means that the base layer 300 is partially present. The thickness of the base layer 300 is gradually increased as the base layer 300 is closer to the first terminal 120 and the thickness of the base layer 300 is gradually decreased as the base layer 300 is closer to the second terminal 140 Means that the base layer 300 contacting the first end 120 is formed as a bottom surface and the base layer 300 contacting the second end 140 has a trapezoidal shape as an upper surface.

At this time, the lamination film 100 for bonding has a cross-sectional shape of a laminated film cut along a straight line connecting one point (A) of the first end and one point (B) of the second end, And the thickness T ₁₂₀ at the distal end may be a triangular or trapezoidal shape that is thicker than the thickness T ₁₄₀ at the second end. The cross-sectional shape of the laminated film may be such that the length of the bottom surface of the triangular or trapezoidal cross section of the base layer 300 is greater than the length of the triangular or trapezoidal bottom surface of the reinforcing layer 500.

I) the functional layer 400 and ii) the base layer 300 excluding the functional layer 400 may have a thickness ratio of 1: 3 to 10 at the first terminal 120. [ Specifically, the base layer 300 excluding the functional layer 400 and the functional layer 400 at the first end 120 may have a thickness ratio of 1: 4 to 8.

In this case, it is advantageous to simultaneously satisfy both the functional characteristics such as the sound insulation characteristic of the functional layer 400 and the physical properties required for the laminated film for bonding, such as the bonding strength of the base layer 300.

I) the functional layer 400 and ii) the base layer 300 except for the functional layer 400 may have a thickness ratio of 1: 0.1 to 2 at the second terminal 140. Specifically, the base layer 300 excluding the functional layer 400 and the functional layer 400 at the second terminal 140 may have a thickness ratio of 1: 0.3 to 1.5. When the functional layer 400 is disposed in the base layer 300 at such a ratio, the functional properties of the base layer 300 and the physical properties of the lamination film for bonding such as bonding force required for the base layer 300 can be satisfied. Particularly when the thickness of the base layer 300 excluding the functional layer 400 is more than 2 based on the functional layer 400, the sound insulation characteristic of the lamination film for bonding 100 may not be sufficient, If it is less than 0.1, the mechanical properties and the bonding strength with the substrate such as glass may be deteriorated.

The thickness (T ₁₂₀ ) at the first end may be 0.2 mm or more thicker than the thickness (T ₁₄₀ ) of the second end, and may be 0.2-0.8 mm thick, more specifically 0.3-0.6 mm It may be thicker. In this case, the display information projected in the form of light from the outside has a double effect and can be suitable for HUD application.

The thickness (T ₁₄₀ ) of the second end may be less than 0.38 mm. Specifically, the thickness (T ₁₄₀ ) of the second end may be in a range of 0.1 mm or more and less than 0.38 mm, and may be 0.1 to 0.36 mm. The laminated film for bonding 100 can have such a considerably thin thickness while satisfying physical properties such as sufficient hardenability and penetration resistance.

The thickness (T ₁₂₀ ) of the first end may be 0.95 mm or less. Specifically, the thickness (T ₁₂₀₎ of the first terminal may be a thickness (T ₁₂₀₎ is 0.1 to 0.85 mm of the first end, it may be a 0.1 to 0.75 mm. The laminated film for bonding 100 can have such a considerably thin thickness while satisfying physical properties such as sufficient hardenability and penetration resistance.

The laminated film for bonding 100 can satisfy the impact resistance characteristics based on KS L 2007: 2008. The impact resistance property is evaluated after being made of the bonded glass according to the above-mentioned specification.

The laminated film for bonding 100 may be one that satisfies the impact resistance property based on KS L 2007: 2008 in a portion having a thickness of 0.65 mm or less.

The lamination film for bonding 100 may be one which satisfies the endurance characteristics based on KS L 2007. The above-mentioned inherent flexibility characteristic is evaluated after being made of a bonded glass according to the above-mentioned specifications.

The bonding laminated film 100 may satisfy the inherent flexibility characteristic based on KS L 2007 in a portion having a thickness of 0.65 mm or less.

The base layer 300 comprises a polyvinyl acetal resin.

The base layer 300 may include a polyvinyl acetal resin and a plasticizer.

The base layer 300 may include polyvinyl acetal resin in an amount of 60 to 76% by weight, and may include 70 to 76% by weight. When the polyvinyl acetal resin is contained in such a range, a relatively high tensile strength and modulus can be imparted to the laminated film 100.

The polyvinyl acetal resin applied to the base layer 300 may have an acetyl group content of less than 2 mol%, specifically 0.01 to 2 mol%. The polyvinyl acetal resin to be applied to the base layer 300 may have a hydroxyl group content of 30 mol% or more, specifically 30 to 50 mol%

When the polyvinyl acetal resin having such characteristics is applied, the base layer 300 can be bonded to a base material such as glass with good mechanical properties.

The polyvinyl acetal resin of the base layer 300 may be a polyvinyl acetal resin obtained by acetalizing a polyvinyl alcohol having a degree of polymerization of 1,600 to 3,000 with aldehyde and may be a polyvinyl acetal resin having a degree of polymerization of 1,700 to 2,500 and acetalized with aldehyde The polyvinyl acetal resin may be a polyvinyl acetal resin. When such a polyvinyl acetal resin is applied, the mechanical properties such as penetration resistance can be sufficiently improved.

The polyvinyl acetal resin may be a synthesized polyvinyl alcohol and an aldehyde, and the kind of the aldehyde is not limited. Specifically, the aldehyde may be any one selected from the group consisting of n-butylaldehyde, isobutylaldehyde, n-barrel aldehyde, 2-ethylbutylaldehyde, n-hexylaldehyde and blend resins thereof. When n-butylaldehyde is used as the aldehyde, the produced polyvinyl acetal resin may have a refractive index characteristic having a small difference from the refractive index of the glass and having a property of excellent bonding strength with glass.

The base layer 300 may include 24 to 40% by weight of the plasticizer based on the entirety of the base layer 300, and may include 24 to 30% by weight of the plasticizer. In the case where the plasticizer is contained in such a range, it is preferable that the bonding laminate film can be provided with appropriate bonding force and impact resistance. The content of the plasticizer refers to the content of the plasticizer in the base layer 300 excluding the functional layer 400 when the functional layer 400 described below is included in the base layer 300.

Specific examples of the plasticizer include triethylene glycol bis 2-ethylhexanoate (3G8), tetraethylene glycol diheptanoate (4G7), triethylene glycol bis 2-ethylbutyrate (3GH), triethylene glycol bis 2- (DBA), dibutyl sebacate (DBS), bis-2-hexyl adipate (DHA), and combinations thereof. May be applied. Specifically, triethyleneglycol di-2-ethylbutylate, triethyleneglycol di-2-ethylhexanoate, triethyleneglycol di-n-heptanoate and combinations thereof , And more specifically, triethylene glycol bis 2-ethylhexanoate (3G8) may be applied.

The base layer 300 may have a glass transition temperature of 15 to 25 ° C as measured by differential scanning calorimetry, and may have a characteristic of 17 to 20 ° C. The base layer 300 having such a glass transition temperature can exhibit excellent sound insulation characteristics at room temperature.

The functional layer 400 may contain 54 to 76% by weight of the polyvinyl acetal resin, and may include 60 to 70% by weight of the polyvinyl acetal resin.

The polyvinyl acetal resin of the functional layer 400 may have an acetyl group content of 8 mol% or more, specifically 8 to 30 mol%.

The polyvinyl acetal resin of the functional layer 400 may be a polyvinyl acetal resin obtained by acetalizing a polyvinyl alcohol having a degree of polymerization of 1,200 to 3,000 with aldehyde and may be a polyvinyl acetal resin having a polymerization degree of 1,600 to 2,400 and acetalized with aldehyde The polyvinyl acetal resin may be a polyvinyl acetal resin. In this case, the compatibility between the optical property and the plasticizer can be improved.

The functional layer 400 may include 24 to 46% by weight of a plasticizer, and may include 30 to 40% by weight of a plasticizer. When the plasticizer is included in the functional layer 400 in such a range of content, the sound insulation of the laminated film can be further improved.

A detailed description of the plasticizer will be omitted because it overlaps with the description of the base layer 300 above.

Particularly, the functional layer 400 may have a temperature of from -15 ° C to -10 ° C when the glass transition temperature is measured by a conventional scanning calorimetry. In this case, it is possible to impart a high sound-insulating performance even at a low temperature, and to provide a laminate film having excellent sound-insulating performance over a wide temperature range.

The base layer 300 may include the functional layer 400 on one side of the base layer 300 and the functional layer 400 on the inside of the base layer 300.

When the base layer 300 is located on one side of the functional layer 400, the functional layer 400 is positioned between the base layer 300 and the reinforcing layer 500, ) (See Fig. 3).

When the base layer 300 is located inside the functional layer 400, the base layer 300 is formed between the first base layer 320 and the second base layer 340, ) May be located. In this case, the thickness of the base layer 300 excluding the functional layer 400 is calculated as the sum of the thickness of the first base layer 320 and the thickness of the second base layer 340. When the functional layer 400 is located inside the base layer 300, the convenience of the fabrication process can be improved by the co-extrusion method.

The reinforcing layer 500 may include an ionomer, a polyethylene terephthalate resin, or a polyimide resin.

The ionomer is a conjugated polymer containing an olefinic repeating unit and a carboxylic acid repeating unit, and an ionic compound containing a metal ion in an acidic functional group can be applied.

Specifically, the ionomer may be an olefin-based ionomer, more specifically, a copolymer of a repeating unit derived from an alpha olefin having 2 to 4 carbon atoms and an alpha, beta ethylenically unsaturated carboxylic acid repeating unit having 3 to 6 carbon atoms Lt; / RTI > The ionomer may be an ionic compound containing a metal ion in the side chain having an acidic functional group.

The ionomer may include 20 to 95% by weight, 20 to 90% by weight, 40 to 95% by weight, and 40 to 75% by weight of the olefinic repeating unit can do. The carboxylic acid repeating unit may be contained in an amount of 5 to 80% by weight, 10 to 80% by weight, 5 to 60% by weight, and 25 to 60% by weight .

As the metal ion, a monovalent, divalent or trivalent metal ion can be applied. Specifically, Na ⁺ , K ⁺ , Li ⁺ , Cs ⁺ , Ag ⁺ , Hg ⁺ , Cu ⁺ , Be ^{2 +} , Mg ^{2 +, Ca 2 +, Sr 2} +, Ba 2 +, Cu 2 +, Cd 2 +, Hg 2+, Pb 2 +, Fe 2 +, Co 2 +, Ni 2 +, Zn 2 +, Al 2 +, Sc ^{3 +} , Fe ^{3 +} , Al ^{3 +} and Yt ^{3 +} can be applied. Specifically, it is preferable to apply Mg ²⁺ , Na ⁺ and Zn ²⁺ as the metal ion.

The ionomer may be a copolymer of an ethylenic repeating unit having 2 to 4 carbon atoms and an ethylenically unsaturated carboxylic acid repeating unit having 3 to 6 carbon atoms and may include at least 5 mol% of an acidic side chain, Ionic compound capable of binding to an ion.

The polyethylene terephthalate resin may have a degree of crystallinity of 0% to 80%, 10% to 70%, and more specifically 40% to 60%. The polyethylene terephthalate resin may be a copolymer resin, and the copolymerized polyethylene terephthalate may be a glycol component in which ethylene glycol and neopentyl glycol are copolymerized.

The polyimide resin is a resin that is prepared by preparing a polyamic acid derivative by solution-combining an aromatic dianhydride with an aromatic diamine or an aromatic diisocyanate and then imidizing the polyamic acid derivative. Specifically, the polyimide resin is an aromatic acid diimine including biphenyltetracarboxylic acid anhydride But is not limited to, those obtained by imidizing a polyamic acid resin synthesized from an aromatic diamine containing water and para-phenylenediamine.

The laminated film 100 for bonding according to the present invention can be applied to a different layer together with a polyvinyl acetyl resin so as to have a specific shape so as to further improve the mechanical properties while maintaining bonding strength with materials such as glass, Thereby providing a laminated film which can be realized even thinner.

The lamination film 100 for bonding may have a sufficient strength in spite of a thin thickness, and is suitable for application as a HUD in a triangular or trapezoidal cross section.

Further, the lamination film 100 for bonding can have a sound insulation performance equal to or more than that of the conventional lamination film 100, and therefore, it has sound insulation, impact resistance and endurance at the same time when applied to the production of a light- .

In addition, since the laminated film for bonding 100 can have a considerable mechanical strength even with a considerably thin thickness, the thickness of the glass itself can be thinly applied to the laminated glass, and the lighter of the laminated glass can be induced .

A method for producing a laminated film for bonding according to another embodiment of the present invention comprises the steps of extruding a composition for forming a base layer containing a polyvinyl acetal resin in a base layer extruding port, Extruding a composition for forming a reinforcing layer comprising a terephthalate resin or a polyimide resin; The coextruded composition for forming a base layer and the composition for forming a reinforcing layer are then transferred to a feed block and the first and second coextruded layers are disposed in a direction perpendicular to the direction of the extrusion progress (direction in which the laminated film for bonding to be manufactured moves) A base layer (300) having a terminal (120) and a second terminal (140) and having a form in which the thickness gradually increases as the base layer composition is closer to the first terminal, and a second layer And a forming step of producing a laminated film for bonding 100 comprising a reinforcing layer 500 having a shape gradually getting thicker toward the end.

Wherein the shape of a section cut along a straight line connecting one point (A) of the first end and one point (B) of the second end of the bonding laminated film (100) ₁₂₀ have a triangular or trapezoidal shape that is thicker than the thickness T ₁₄₀ at the second end.

In the above-described manufacturing method, the lamination film 100 for bonding described above can be manufactured by applying the co-extrusion method to efficiently mass-produce the lamination film 100 for bonding having the base layer 300 and the reinforcing layer 500.

The co-extruding step may further include pneumatically delivering a composition for forming a functional layer containing 54 to 76% by weight of a polyvinyl acetal resin and 24 to 46% by weight of a plasticizer, and in the forming step, The base layer 100 may further include a functional layer 400 formed inside the base layer 300 or between the reinforcing layer 500 and the base layer 300.

The lamination film 100 for bonding formed in this manner has a structure including the base layer 300 or a functional layer 400 disposed between the base layer 300 and the reinforcing layer 500 Lt; / RTI >

The composition for forming the base layer, the composition for forming the functional layer, and the composition for forming the reinforcing layer each have the composition of the base layer and the composition of the functional layer described above. And a composition of the components contained in the reinforcing layer, or a composition containing each of these monomers or an oligomer, and may further include a solvent, if necessary.

The lamination film 100 for bonding formed according to the above manufacturing method has a thickness, a shape of a cross section, a ratio of the thickness at the first end and the second end of each layer, and the like. They are omitted in order to avoid duplication.

Hereinafter, another embodiment of the present invention will be described in detail.

FIG. 1 is a schematic view for explaining a top view of a light transmission laminate 700 manufactured according to an embodiment of the present invention, FIG. 5 is a schematic view illustrating a light transmission laminate 700 manufactured according to an embodiment of the present invention, 6 and 7 are conceptual diagrams illustrating a cross-sectional structure of a laminated film for bonding 100 manufactured according to another embodiment of the present invention . Hereinafter, the present invention will be described in more detail with reference to Figs.

A laminated film 100 for bonding according to an embodiment of the present invention is a laminated film having a first end 120 and a second end 140 facing the first end, A base layer 300 having a thickness gradually increasing toward the first end 120; And ii) a reinforcing layer (500) having a shape in which the thickness becomes gradually thinner toward the second end (140).

The bonding laminated film 100 has a thickness T ₁₂₀ at the first terminal end and a thickness T ₁₄₀ at the second terminal end, Sectional shape cut along the straight line connecting one point B of the second end to each other is polygonal. More specifically, the polygon has a triangular or rhomboid shape as a whole, and may have a shape in which a part of one surface of the surface other than the bottom surface (bottom surface and top surface) is bent.

Thus, the lamination film 100 for bonding has a wedge-shaped overall shape in which the first end 120 is thicker than the second end 140 (see FIG. 5) ).

The cross-sectional shape of the laminated film 100 may be a cross-sectional shape of a base layer 300 having a triangular or trapezoidal shape with a bottom corresponding to a thickness at the first end 120, And a cross section of the reinforcing layer 500 in a triangular or trapezoidal shape with the corresponding line as a vertex or a top surface.

The bottom surface of the reinforcing layer 500 may be in contact with the top surface of the base layer 300.

The reinforcing layer 500 may be comprised of a first reinforcing layer 520 that is one surface of the second terminal 140 and contains a resin for the reinforcing layer that is an ionomer, polyethylene terephthalate resin, or polyimide resin. (See Fig. 6 (a)).

The reinforcing layer 500 may include a first reinforcing layer 520 having one side with the second end 140 and containing a resin for reinforcing layer which is an ionomer, a polyethylene terephthalate resin, or a polyimide resin, And a second reinforcing layer 540 located between the base layer 300 and the first reinforcing layer 520 and having the polyvinyl acetal resin and the resin for the reinforcing layer non-uniformly mixed 6 (b)).

The bottom surface of the second reinforcing layer 540 may be in contact with the top surface of the base layer 300.

The bottom surface of the first reinforcing layer 520 may be in contact with the top surface of the second reinforcing layer 540.

The base layer 300 may further include a functional layer 400 located therein (see FIGS. 6 and 7). Specifically, the base layer 300 includes a first base layer 320, a functional layer 400 located on one side of the first base layer, and a second base layer 340 located on one side of the functional layer. . ≪ / RTI >

As the functional layer 400, a sound insulating layer may be specifically used.

The base layer 300 may further include another functional layer, and may specifically include a shade band layer or the like.

The lamination film for bonding (100) is characterized in that the shape of the section of the laminated film cut along a straight line connecting one point (A) of the first end and one point (B) of the second end is different from that of the first end the thickness (T ₁₂₀₎ is the first may be a thickness (T ₁₄₀₎ thicker than the triangular or trapezoidal shape according to the second terminal.

The cross-sectional shape of the laminated film may be such that the length of the bottom surface of the triangular or trapezoidal cross section of the base layer 300 is greater than the length of the triangular or trapezoidal bottom surface of the reinforcing layer 500.

I) the functional layer 400 and ii) the base layer 300 excluding the functional layer 400 may have a thickness ratio of 1: 3 to 10 at the first terminal 120. [ Specifically, the base layer 300 excluding the functional layer 400 and the functional layer 400 at the first end 120 may have a thickness ratio of 1: 4 to 8.

In this case, it is advantageous to simultaneously satisfy both the functional characteristics such as the sound insulation characteristic of the functional layer 400 and the physical properties required for the laminated film for bonding, such as the bonding strength of the base layer 300.

The cross-sectional shape of the laminated film 100 includes a first end 120, a first surface 110 having one end connected to the first end and a second end connected to the second end, And a second surface 130, one end of which is connected to the second end and the other end of which is connected to the first end, is connected to the first surface and the second surface, The angle made by the parallel plane (angle at the second end, [theta] ₂ ) may be from 1 to 4 mrad, may be from 2 to 3 mrad, and may be from 1.8 to 2.2 mrad or 2.65 to 2.99 mrad.

The cross-sectional shape of the laminated film 100 includes a first end 120, a first surface 110 having one end connected to the first end and a second end connected to the second end, And a second surface 130, one end of which is connected to the second end and the other end of which is connected to the first end, is connected to the first surface and the second surface, The angle formed by the parallel plane (angle at the first end,? ₁ ) may be between 0.5 and 0.8 mrad and between 0.6 and 0.7 mrad.

This angle allows the laminated film to impart sufficient mechanical strength while applying a minimum of polymeric resin. When the angle is set to be such an angle, on one of the first surface and the second surface, a line connecting an angle at the first end and a line connecting an angle at the second end meet, Break "occurs.

Such a portion tends to cause bubbles to remain when the laminated film 100 is bonded to a pair of glass, which tends to cause defective bonding glass. In the present invention, as a method for solving such a problem, 540, which is described in the above-mentioned "bent portion ".

Specifically, the correction area P, which is a portion corresponding to one surface of the second reinforcing layer among the first surface 110 or the second surface 130, may have a surface roughness of 30 to 90 μm, 80 um, 46 um to 70 um, and 50 um to 60 um. When the correction region P has a relatively high surface roughness, it is possible to manufacture a laminated film having almost no bubble remaining due to the "bent portion " in the glass bonding process and having excellent bonding properties to glass .

The reinforcing layer 500 is a distance between one point of the second end 140 that the reinforcing layer 500 contacts and one point of the reinforcing layer 500 that is the farthest from the second end 140, The height H ₅₀₀ can be from 1 to 250 mm, can be from 10 to 200 mm, can be from 20 to 180 mm, and can be from 100 to 160 mm. Most preferably, the height (H ₅₀₀ ) of the reinforcing layer may be between 105 and 145 mm. In this case, even the thin portion of the lamination film for bonding can have sufficient penetration resistance and impact resistance by the reinforcing layer, and at the same time, since the kinds of the polymer resin applied to the reinforcing layer and the base layer are different, The influence of the light transmission characteristic on the visual field can be minimized.

When the reinforcing layer 500 includes the first reinforcing layer 520 and the second reinforcing layer 540, each height H ₅₀₀ has a value equal to or greater than the sum of H ₅₂₀ and H ₅₄₀ . Specifically, the H ₅₂₀ may be 1 to 250 mm, may be 10 to 180 mm, may be 20 to 140 mm, and may be 100 to 130 mm. Specifically, the H ₅₄₀ may be from 0 to 25 mm, from 1 to 20 mm, from 3 to 16 mm, and from 5 to 10 mm. In the case of having H ₅₄₀ value in this range, the influence of the relatively bent portion on the glass bonding can be reduced.

The thickness (T ₁₂₀ ) at the first end may be 0.2 mm or more thicker than the thickness (T ₁₄₀ ) of the second end, and may be 0.2-0.8 mm thick, more specifically 0.3-0.6 mm It may be thicker. In this case, the display information projected in the form of light from the outside has a double effect and can be suitable for HUD application.

The thickness (T ₁₄₀ ) of the second end may be less than 0.38 mm. Specifically, the thickness (T ₁₄₀ ) of the second end may be in a range of 0.1 mm or more and less than 0.38 mm, and may be 0.1 to 0.36 mm. The laminated film for bonding 100 can have such a considerably thin thickness while satisfying physical properties such as sufficient hardenability and penetration resistance.

The thickness (T ₁₂₀ ) of the first end may be 0.95 mm or less. Specifically, the thickness (T ₁₂₀₎ of the first terminal may be a thickness (T ₁₂₀₎ is 0.1 to 0.85 mm of the first end, it may be a 0.1 to 0.75 mm. The laminated film for bonding 100 can have such a considerably thin thickness while satisfying physical properties such as sufficient hardenability and penetration resistance.

The laminated film for bonding 100 can satisfy the impact resistance characteristics based on KS L 2007: 2008. The impact resistance property is evaluated after being made of the bonded glass according to the above-mentioned specification.

The laminated film for bonding 100 may be one that satisfies the impact resistance property based on KS L 2007: 2008 in a portion having a thickness of 0.65 mm or less.

The lamination film for bonding 100 may be one which satisfies the endurance characteristics based on KS L 2007. The above-mentioned inherent flexibility characteristic is evaluated after being made of a bonded glass according to the above-mentioned specifications.

The bonding laminated film 100 may satisfy the inherent flexibility characteristic based on KS L 2007 in a portion having a thickness of 0.65 mm or less.

The base layer 300 may include a polyvinyl acetal resin and a plasticizer.

The base layer 300 may include polyvinyl acetal resin in an amount of 60 to 76% by weight, and may include 70 to 76% by weight. When the polyvinyl acetal resin is contained in such a range, a relatively high tensile strength and modulus can be imparted to the laminated film 100.

The polyvinyl acetal resin applied to the base layer 300 may have an acetyl group content of less than 2 mol%, specifically 0.01 to 2 mol%. The polyvinyl acetal resin to be applied to the base layer 300 may have a hydroxyl group content of 30 mol% or more, specifically 30 to 50 mol%

When the polyvinyl acetal resin having such characteristics is applied, the base layer 300 can be bonded to a base material such as glass with good mechanical properties.

The polyvinyl acetal resin of the base layer 300 may be a polyvinyl acetal resin obtained by acetalizing a polyvinyl alcohol having a degree of polymerization of 1,600 to 3,000 with aldehyde and may be a polyvinyl acetal resin having a degree of polymerization of 1,700 to 2,500 and acetalized with aldehyde The polyvinyl acetal resin may be a polyvinyl acetal resin. When such a polyvinyl acetal resin is applied, the mechanical properties such as penetration resistance can be sufficiently improved.

The polyvinyl acetal resin may be a synthesized polyvinyl alcohol and an aldehyde, and the kind of the aldehyde is not limited. Specifically, the aldehyde may be any one selected from the group consisting of n-butylaldehyde, isobutylaldehyde, n-barrel aldehyde, 2-ethylbutylaldehyde, n-hexylaldehyde and blend resins thereof. When n-butylaldehyde is used as the aldehyde, the produced polyvinyl acetal resin may have a refractive index characteristic having a small difference from the refractive index of the glass and having a property of excellent bonding strength with glass.

The base layer 300 may include 24 to 40% by weight of the plasticizer based on the entirety of the base layer 300, and may include 24 to 30% by weight of the plasticizer. In the case where the plasticizer is contained in such a range, it is preferable that the bonding laminate film can be provided with appropriate bonding force and impact resistance. The content of the plasticizer refers to the content of the plasticizer in the base layer 300 excluding the functional layer 400 when the functional layer 400 described below is included in the base layer 300.

Specific examples of the plasticizer include triethylene glycol bis 2-ethylhexanoate (3G8), tetraethylene glycol diheptanoate (4G7), triethylene glycol bis 2-ethylbutyrate (3GH), triethylene glycol bis 2- (DBA), dibutyl sebacate (DBS), bis-2-hexyl adipate (DHA), and combinations thereof. May be applied. Specifically, triethyleneglycol di-2-ethylbutylate, triethyleneglycol di-2-ethylhexanoate, triethyleneglycol di-n-heptanoate and combinations thereof , And more specifically, triethylene glycol bis 2-ethylhexanoate (3G8) may be applied.

The base layer 300 may have a glass transition temperature of 15 to 25 ° C as measured by differential scanning calorimetry, and may have a characteristic of 17 to 20 ° C. The base layer 300 having such a glass transition temperature can exhibit excellent sound insulation characteristics at room temperature.

The functional layer 400 may contain 54 to 76% by weight of the polyvinyl acetal resin, and may include 60 to 70% by weight of the polyvinyl acetal resin.

The polyvinyl acetal resin of the functional layer 400 may have an acetyl group content of 8 mol% or more, specifically 8 to 30 mol%.

The polyvinyl acetal resin of the functional layer 400 may be a polyvinyl acetal resin obtained by acetalizing a polyvinyl alcohol having a degree of polymerization of 1,200 to 3,000 with aldehyde and may be a polyvinyl acetal resin having a polymerization degree of 1,600 to 2,400 and acetalized with aldehyde The polyvinyl acetal resin may be a polyvinyl acetal resin. In this case, the compatibility between the optical property and the plasticizer can be improved.

The functional layer 400 may include 24 to 46% by weight of a plasticizer, and may include 30 to 40% by weight of a plasticizer. When the plasticizer is included in the functional layer 400 in such a range of content, the sound insulation of the laminated film can be further improved.

A detailed description of the plasticizer will be omitted because it overlaps with the description of the base layer 300 above.

Particularly, the functional layer 400 may have a temperature of from -15 ° C to -10 ° C when the glass transition temperature is measured by a conventional scanning calorimetry. In this case, it is possible to impart a high sound-insulating performance even at a low temperature, and to provide a laminate film having excellent sound-insulating performance over a wide temperature range.

The base layer 300 may include the functional layer 400 on one side of the base layer 300 and the functional layer 400 on the inside of the base layer 300.

When the base layer 300 is located inside the functional layer 400, the base layer 300 is formed between the first base layer 320 and the second base layer 340, ) May be located. In this case, the thickness of the base layer 300 excluding the functional layer 400 is calculated as the sum of the thickness of the first base layer 320 and the thickness of the second base layer 340. When the functional layer 400 is located inside the base layer 300, the convenience of the manufacturing process can be improved by a co-extrusion method.

The reinforcing layer 500 may include an ionomer, a polyethylene terephthalate resin, or a polyimide resin.

The ionomer is a conjugated polymer containing an olefinic repeating unit and a carboxylic acid repeating unit, and an ionic compound containing a metal ion in an acidic functional group can be applied.

Specifically, the ionomer may be an olefin-based ionomer, more specifically, a copolymer of a repeating unit derived from an alpha olefin having 2 to 4 carbon atoms and an alpha, beta ethylenically unsaturated carboxylic acid repeating unit having 3 to 6 carbon atoms Lt; / RTI > The ionomer may be an ionic compound containing a metal ion in the side chain having an acidic functional group.

The ionomer may include 20 to 95% by weight, 20 to 90% by weight, 40 to 95% by weight, and 40 to 75% by weight of the olefinic repeating unit can do. The carboxylic acid repeating unit may be contained in an amount of 5 to 80% by weight, 10 to 80% by weight, 5 to 60% by weight, and 25 to 60% by weight .

As the metal ion, a monovalent, divalent or trivalent metal ion can be applied. Specifically, Na ⁺ , K ⁺ , Li ⁺ , Cs ⁺ , Ag ⁺ , Hg ⁺ , Cu ⁺ , Be ^{2 +} , Mg ^{2 +, Ca 2 +, Sr 2} +, Ba 2 +, Cu 2 +, Cd 2 +, Hg 2+, Pb 2 +, Fe 2 +, Co 2 +, Ni 2 +, Zn 2 +, Al 2 +, Sc ^{3 +} , Fe ^{3 +} , Al ^{3 +} and Yt ^{3 +} can be applied. Specifically, it is preferable to apply Mg ²⁺ , Na ⁺ and Zn ²⁺ as the metal ion.

The ionomer may be a copolymer of an ethylenic repeating unit having 2 to 4 carbon atoms and an ethylenically unsaturated carboxylic acid repeating unit having 3 to 6 carbon atoms and may include at least 5 mol% of an acidic side chain, Ionic compound capable of binding to an ion.

The polyethylene terephthalate resin may have a degree of crystallinity of 0% to 80%, 10% to 70%, and more specifically 40% to 60%. The polyethylene terephthalate resin may be a copolymer resin, and the copolymerized polyethylene terephthalate may be a glycol component in which ethylene glycol and neopentyl glycol are copolymerized.

The polyimide resin is a resin that is prepared by preparing a polyamic acid derivative by solution-combining an aromatic dianhydride with an aromatic diamine or an aromatic diisocyanate and then imidizing the polyamic acid derivative. Specifically, the polyimide resin is an aromatic acid diimine including biphenyltetracarboxylic acid anhydride But is not limited to, those obtained by imidizing a polyamic acid resin synthesized from an aromatic diamine containing water and para-phenylenediamine.

The laminated film 100 for bonding according to the present invention can be applied to a different layer together with a polyvinyl acetyl resin so as to have a specific shape so as to further improve the mechanical properties while maintaining bonding strength with materials such as glass, Thereby providing a laminated film which can be realized even thinner.

The lamination film 100 for bonding may have a sufficient strength in spite of a thin thickness, and is suitable for application as a HUD in a triangular or trapezoidal cross section.

Further, the lamination film 100 for bonding can have a sound insulation performance equal to or more than that of the conventional lamination film 100, and therefore, it has sound insulation, impact resistance and endurance at the same time when applied to the production of a light- .

In addition, since the laminated film for bonding 100 can have a considerable mechanical strength even with a considerably thin thickness, the thickness of the glass itself can be thinly applied to the laminated glass, and the lighter of the laminated glass can be induced .

A method for producing a laminated film for bonding according to another embodiment of the present invention comprises the steps of extruding a composition for forming a base layer containing a polyvinyl acetal resin in a base layer extruding port, Extruding a composition for forming a reinforcing layer comprising a terephthalate resin or a polyimide resin; The coextruded composition for forming a base layer and the composition for forming a reinforcing layer are moved to a feed block and have a first end 120 and a second end 140 located in a direction perpendicular to the extrusion direction A base layer (300) containing a composition for forming a base layer and sharing a surface with the first end and having a thickness gradually getting closer to the first end, and a composition for forming an enhancement layer And a reinforcing layer (500) having a shape in which a thickness of the reinforcing layer (500) is gradually decreased from the second end to the second end.

Wherein the shape of a section cut along a straight line connecting one point (A) of the first end and one point (B) of the second end of the bonding laminated film (100) ₁₂₀ ) is thicker than the thickness (T ₁₄₀ ) at the second end.

In the above-described manufacturing method, the lamination film 100 for bonding described above can be manufactured by applying the co-extrusion method to efficiently mass-produce the lamination film 100 for bonding having the base layer 300 and the reinforcing layer 500.

The co-extruding step may further include pneumatically delivering a composition for forming a functional layer containing 54 to 76% by weight of a polyvinyl acetal resin and 24 to 46% by weight of a plasticizer, and in the forming step, The base layer 100 may have a structure in which the functional layer 400 is located in the base layer 300.

The composition for forming the base layer, the composition for forming the functional layer, and the composition for forming the reinforcing layer each have the composition of the base layer and the composition of the functional layer described above. And a composition of the components contained in the reinforcing layer, or a composition containing each of these monomers or an oligomer, and may further include a solvent, if necessary.

The lamination film 100 for bonding formed according to the above manufacturing method has a thickness, a shape of a cross section, a ratio of the thickness at the first end and the second end of each layer, and the like. They are omitted in order to avoid duplication.

Another light-transmitting laminate 700 according to another embodiment of the present invention includes a first light-transmitting layer 200; A laminated film 100 for bonding according to an embodiment of the present invention, which is positioned on one side of the first light transmitting layer; And a second light transmitting layer (600) located on the lamination film for bonding.

The first light transmitting layer 200 and the second light transmitting layer 600 may be independently light transmitting glass or light transmitting plastic.

The light transmission layered structure 700 is formed by the lamination film 100 for bonding while maintaining the light transmission characteristics of the first light transmission layer 200 and the second light transmission layer 600 at substantially the same level, The light transmitting layers on both sides are bonded and can have properties required for safety glass such as impact resistance and penetration resistance.

In addition, the light-transmitting laminated body 700 has properties suitable for application to safety glass according to the properties of the laminated film for bonding 100 contained therein, and at the same time has optical characteristics suitable for application to a HUD. Specifically, when the display information to be sent to the projector 800 or the like is projected onto the light-transmitting laminate 700, there is little or no secondary image formation that may occur due to its thickness or reflection angle, or is insignificant enough to be visually confirmed.

The light-transmitting laminated body 700 may further have a sound insulating property, and it has excellent functionality when applied to a glass (including a windshield) of an automobile, a building material, and the like.

The front display system 900 according to another embodiment of the present invention includes the above-described light transmission laminate 700 and the projector 800 (see FIGS. 2 and 5).

The detailed description of the light-transmitting laminated body 700, the detailed description of the laminated film for bonding 100, etc. overlap with those of the above description, so that detailed description thereof will be omitted.

The light-transmitting laminated body 700 may be employed as a separate display device such that it is positioned in the windshield of a vehicle such as an automobile or in the field of view when the driver looks forward.

The light-transmitting laminate 700 projects an image transmitted by the project 800 and displays it as a one-dimensional image free from ghost images. This is suitable as a display device of a front display device called a head-up display Do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Manufacturing example

The components used in the following examples are as follows.

First polyvinyl butyral resin: Polyvinyl alcohol having an average degree of polymerization of 1700, a hydroxyl group content of 45 mol%, an acetyl group content of 1 mol%

Second polyvinyl butyral resin: polyvinyl alcohol having an average degree of polymerization of 2400, a hydroxyl group content of 20 mol%, an acetyl group content of 11 mol%

Plasticizer: triethylene glycol bis 2-ethylene hexanoate (3G8) (available from PROVIRON Corporation PROVIST 1766)

Ionomer: poly (ethylene-co-methacrylic acid) salt (available from SK Innovation)

1) Experimental Example 1

Example

The base layer used was a composition for forming a base layer comprising 73 wt% of a first polyvinyl butyral resin and 27 wt% of a plasticizer, and the functional layer contained 65 wt% of a second polyvinyl butyral resin and 35 wt% of a plasticizer , And the reinforcing layer is formed by applying a composition for forming a reinforcing layer containing 100% by weight of an ionomer, coextruding through each of the extruding ports to form three layers of a base layer, a functional layer, and a reinforcing layer .

The three layers were each moved to a pit block and molded into a laminated film for bonding of the embodiment having the structure and shape of Fig.

Comparative Example

The reinforcing layer of the comparative example having the same composition as that of the base layer of the example was formed in the same shape and size as those of the reinforcing layer of the example and a laminated film for bonding of the comparative example .

Property evaluation

Evaluation of Inner Tube Capacity

KS L 2007, the endurance of the bonded glass (optical transparent laminate) to which the laminated films for bonding prepared in Examples and Comparative Examples were bonded was evaluated.

A laminate was prepared from a 2.1 T glass having a size of 300 mm x 300 mm and a lamination film for joining of Examples and Comparative Examples with a laminated structure of a 2.1 T glass-lamination film for joining-2.1 T glass and preliminarily bonded thereto by vacuum, And then sealed. Thereafter, the present bonding was carried out at 150 ° C for 2 hours using a high-pressure autoclave to prepare a sample for evaluation of physical properties.

In the physical property evaluation sample, 2.27 kg of steel balls were fired at 20 ° C at the positions of the respective zones shown in FIG. 5, and the height (MBH) at which the test piece penetrated was measured. In this case, fail is indicated when the penetration is less than 4 m, and pass when the penetration is more than 4 m.

Evaluation of impact resistance

KS L 2007: 2008, the impact resistance of the laminated glass bonded to the laminated films for bonding prepared in Examples and Comparative Examples was evaluated.

The laminate was a laminated structure of a 2.1 T glass-laminated film-2.1 T glass laminated film, and samples for evaluating physical properties were prepared in the same manner as in the above evaluation of penetration toughness.

The low temperature evaluation was carried out as follows: 227 g of steel balls were stored at a temperature of -20 ° C for 4 hours, then dropped at a height of 9 m from the height of each zone shown in FIG. 5, and the amount of glass dropped or scattered on the sheet Fail if not greater than 15 g, pass if the impacted specimen is not broken or the glass is scattered and the amount of glass falling from the sheet is less than 15 g.

At room temperature evaluation, 227 g of steel balls were stored at 40 캜 for 4 hours, then dropped at a height of 10 m from each of the zones shown in Fig. 5, and the amount of glass falling or scattered from the sheet Fail in the case of 15 g or more, pass if the impacted specimen is not broken or the glass is scattered and the amount of glass falling from the sheet is less than 15 g.

Evaluation of car sound

The 2.1 T glass of 300 mm × 25 mm and the laminated films of the examples and comparative examples were heated in a laminator at a temperature of 130 ° C. for 15 minutes in a laminated structure of 2.1T glass-laminated film for joining-2.1T glass, To prepare specimens. Each specimen was aged in a constant-temperature chamber at 0 ° C, 20 ° C, or 30 ° C for 1 hour.

The vibration specimens were excited by a vibration generator for damping test, the obtained vibration characteristics were amplified by a mechanical impedance amplifier, and the obtained vibration spectrum was analyzed by an FFT (fast Fourier transform) spectrum analyzer to draw a graph. The loss factor at a frequency of about 2,000 to 4,000 Hz was calculated using the 1 dB method.

The higher the loss factor, the better the sound insulation performance and the ordinary sound insulation film has a loss factor of 0.35 at 20 ° C. As a result of the evaluation, when the loss factor of zero is 0.35 or more, it is indicated as fall when the pass is less than 0.35.

Evaluation of dual images

A laminated glass (light transmission laminate) manufactured in the same manner as the above-mentioned inherent toughness tester was placed on a windshield of a vehicle by a windshield, and a projector was installed on a lower part of the windshield. Then, display information was projected on the laminated glass, After displaying the images, the presence or absence of duplicate images was evaluated with naked eyes. Passages were judged to be unidentified.

Average thickness evaluation

The real-time thickness data were continuously checked through the thickness profile (X-ray) in the film, and the average value thereof was shown.

Bubble occurrence

A glass bonded specimen was prepared and evaluated for the presence of bubbles in the glass bonded to the entire area including the correction area. When the bubbles were not left, the bubbles remained, but when the maximum bubble diameter was 50 μm or less, , And bubbles were present, and when the maximum diameter exceeded 50 μm, it was evaluated as X.

After leaving the specimen at 130 DEG C for 2 hours, the presence or absence of air bubbles in the bonded glass was evaluated in the same manner as above.

Results of physical property evaluation

The above evaluation results are shown in Tables 1 and 2 below using Comparative Examples and Examples.

Example
area Laminated film
Average thickness Impact resistance
(Low temperature) Impact resistance
(Room temperature) Intrinsic flexibility Car voice double
image 1-1 750 um pass pass pass pass pass 1-2 pass pass pass 1-3 pass pass pass 1-4 pass pass pass 2-1 600 um pass pass pass 2-2 pass pass pass 2-3 pass pass pass 2-4 pass pass pass 3-1 350 um pass pass pass 3-2 pass pass pass 3-3 pass pass pass 3-4 pass pass pass

Comparative Example
area Laminated film
Average thickness Impact resistance
(Low temperature) Impact resistance
(Room temperature) Intrinsic flexibility Car voice double
image 1-1 750 um pass pass pass pass pass 1-2 pass pass pass 1-3 pass pass pass 1-4 pass pass pass 2-1 600 um fail fail fail 2-2 fail pass pass 2-3 fail fail fail 2-4 fail fail fail 3-1 350 um fail fail fail 3-2 fail fail fail 3-3 fail fail fail 3-4 fail fail fail

Referring to the results shown in Tables 1 and 2, both the laminated glass of the examples and the laminated glasses of the comparative examples are excellent in the evaluation of the differential image and double image, but show a large difference in the penetration resistance and impact resistance.

In particular, the samples to be compared were characterized by the characteristics of the wedge-shaped film having a triangular or trapezoidal cross section in the regions 2-1 to 2-4, 3-1 to 3-4 measured at an average thickness of 600 [mu] m and 300 [ The results show that the impact resistance and penetration resistance are remarkably decreased. This shows that the reinforced glass has no sufficient impact resistance and endurance characteristics at the thin portion.

On the other hand, the samples of the examples were prepared in the same manner as in Examples 1 to 2-4, 3-1 to 3-4 It is evaluated that both the impact resistance and the ductility are excellent in the region. In the present invention, both the sound insulation performance and the dual image are evaluated at the same level or more, while having sufficient impact resistance and penetration performance even at a thin thickness by applying the reinforcement layer.

2) Experimental Example 2

Example

The base layer used was a composition for forming a base layer comprising 73 wt% of a first polyvinyl butyral resin and 27 wt% of a plasticizer, and the functional layer contained 65 wt% of a second polyvinyl butyral resin and 35 wt% of a plasticizer , And the reinforcing layer was co-extruded through each extrusion port by applying a composition for forming a reinforcing layer containing 100 wt% of the ionomer to form a base layer, a functional layer, and a reinforcing layer .

The three layers were each moved to a pit block and were molded into a laminated film for bonding of the embodiment having the structure and shape corresponding to Fig. 3 (b). The correction region (P) of the laminated film for bonding formed was formed on one side of the second reinforcing layer and gave a surface roughness of 40 to 70 mu m.

Comparative Example

The reinforcing layer of the comparative example having the same composition as that of the base layer of the example was formed in the same shape and size as those of the reinforcing layer of the example and a laminated film for bonding of the comparative example .

Results of physical property evaluation

The method of evaluating physical properties was applied in the same manner as in Experimental Example 1, and the results are shown in Table 3 below.

Example
area Laminated film
Average thickness Impact resistance
(Low temperature / room temperature) Intrinsic flexibility Bubble generation
(Immediately after bonding / after leaving) Car voice double
image 1-1 750 um pass / pass pass ○ / ○ pass pass 1-2 pass / pass pass 1-3 pass / pass pass 1-4 pass / pass pass 2-1 600 um pass / pass pass 2-2 pass / pass pass 2-3 pass / pass pass 2-4 pass / pass pass 3-1 350 um pass / pass pass 3-2 pass / pass pass 3-3 pass / pass pass 3-4 pass / pass pass Comparative Example
area Laminated film
Average thickness Impact resistance
(Low temperature / room temperature) Intrinsic flexibility Bubble generation
(Immediately after bonding / after leaving) Car voice double
image 1-1 750 um pass / pass pass ○ / ○ pass pass 1-2 pass / pass pass 1-3 pass / pass pass 1-4 pass / pass pass 2-1 600 um pass / pass fail 2-2 pass / pass pass 2-3 pass / pass fail 2-4 pass / pass fail 3-1 350 um pass / pass fail 3-2 pass / pass fail 3-3 pass / pass fail 3-4 pass / pass fail

Referring to the results shown in Table 3, both of the laminated glass of the examples and the laminated glass of the comparative example are excellent in the evaluation of the differential image and the double image, but show a large difference in the penetration resistance and the impact resistance.

In particular, the samples to be compared were characterized by the characteristics of the wedge-shaped film having a triangular or trapezoidal cross section in the regions 2-1 to 2-4, 3-1 to 3-4 measured at an average thickness of 600 [mu] m and 300 [ The results show that the impact resistance and penetration resistance are remarkably decreased. This shows that the reinforced glass has no sufficient impact resistance and endurance characteristics at the thin portion.

On the other hand, the samples of the examples were prepared in the same manner as in Examples 1 to 2 to 4, 3-1 to 3- It is evaluated that both the impact resistance and the ductility are excellent in the 4th zone. In the present invention, both the sound insulation performance and the dual image performance are evaluated to be equal to or more than the reference value, while having sufficient impact resistance and penetration performance even at a thin thickness by applying the reinforcement layer.

In the laminated film for bonding according to the present invention in which the dissimilar resin-reinforced layer is positioned at the second end, a kind of "bent portion" caused by a difference in thickness increase ratio between the reinforcing layer and the base layer may occur However, in the present invention, by setting a correction region in the bent portion and increasing the surface roughness to correct the tilting, it is possible to solve the problem And it was experimentally confirmed that there is substantially no bubble formation at the time of glass bonding.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

100: laminated film for bonding 110: first side
120: first end 130: second side
140: second end 160: shade band
200: first light transmitting layer 300: base layer
320: first base layer 340: second base layer
400: functional layer 500: reinforcing layer
520: first reinforcing layer 540: second reinforcing layer (non-uniform reinforcing layer)
600: second light transmitting layer 700: light transmitting laminate
800: Projector 900: Front display system
A: One point at the first end B: One point at the second end
T ₁₂₀ : the thickness of the laminated film for bonding at the first end
(The distance between the first surface and the second surface in the cross section cut by the AB line)
T ₁₄₀ : the thickness of the laminated film for bonding at the second end
(The distance between the first surface and the second surface in the cross section cut by the AB line)
T ₃₀₀ : thickness of base layer T ₄₀₀ : thickness of functional layer
T ₅₀₀ : Thickness of the reinforcing layer
H ₅₀₀ : height of reinforcing layer H ₅₂₀ : height of first reinforcing layer
H ₅₄₀ : height of the second reinforcing layer (non-uniform reinforcing layer)
P: correction area

Claims (14)

delete A laminated film having a first end and a second end opposite to the first end,
A base layer having a shape including a polyvinyl acetal resin and having a thickness gradually getting closer to the first end; And a reinforcing layer having a shape gradually increasing in thickness toward the second end,
Wherein the shape of the cross section of the laminated film cut along a straight line connecting one point of the first end and one point of the second end is such that the thickness at the first end is larger than the thickness at the second end Or a triangular or trapezoidal shape,
Wherein the shape of the cross section of the laminated film is a triangular or trapezoidal shape having a bottom surface with a line corresponding to the thickness at the second end and a triangular or trapezoidal shape having a line corresponding to the thickness at the second end, Wherein the reinforcing layer comprises a cross section of the reinforcing layer. 3. The method of claim 2,
The base layer further comprises a functional layer,
The functional layer is located inside the base layer and does not directly contact the reinforcing layer or directly contacts one surface of the reinforcing layer and shares one surface with the outer surface of the base layer,
Wherein the functional layer has a sound insulating function. 3. The method of claim 2,
Wherein the base layer and the reinforcing layer at the first end have a thickness ratio of 10: 0 to 2. 3. The method of claim 2,
And wherein the reinforcing layer and the base layer at the second end have a thickness ratio of 10: 0 to 4. The method of claim 3,
Wherein the base layer excluding the functional layer and the functional layer at the first end has a thickness ratio of 1: 3 to 10. 3. The method of claim 2,
And the thickness of the second end is less than 0.38 mm. 3. The method of claim 2,
And the thickness of the first end is 0.95 mm or less. 3. The method of claim 2,
Wherein the thickness at the first end is 0.2 mm or more thicker than the thickness at the second end. 3. The method of claim 2,
Wherein the laminated film for bonding satisfies the impact resistance property according to KS L 2007: 2008. 3. The method of claim 2,
Wherein said lamination film for lamination satisfies an inherent flexibility characteristic based on KS L 2007. [ A step of extruding a composition for forming a base layer containing a polyvinyl acetal resin in a base layer extruding port, and a step of extruding a composition for forming a reinforcing layer comprising an ionomer, a polyethylene terephthalate resin or a polyimide resin A co-extrusion step comprising the steps of: And
The coextruded composition for forming a base layer and the composition for forming a reinforcing layer are moved to a feed block and a first end located in a direction perpendicular to the extrusion direction and a second end located in a position opposite to the first end A base layer having a second end and having a shape such that the thickness of the base layer is gradually increased toward the first end, and a composition for forming a reinforcing layer, the thickness of which is gradually increased toward the second end And a reinforcing layer having a thickness of at least 100 m < 2 >
Wherein the lamination film for bonding has a shape in which the cross-sectional shape of the laminated film cut along a straight line connecting one point of the first end and one point of the second end is larger than a thickness at the first end A triangular or trapezoidal shape having a larger value,
Wherein the shape of the cross section of the laminated film is a triangular or trapezoidal shape having a bottom surface with a line corresponding to the thickness at the second end and a triangular or trapezoidal shape having a line corresponding to the thickness at the second end, Wherein the reinforcing layer comprises a cross section of the reinforcing layer. 13. The method of claim 12,
Wherein the coextruding step further comprises pneumatically delivering a composition for forming a functional layer containing 54 to 76% by weight of a polyvinyl acetal resin and 24 to 46% by weight of a plasticizer, Wherein a functional layer is further formed inside the base layer or between the reinforcing layer and the base layer. A first light transmitting layer; The laminated film for bonding according to claim 2, which is located on one surface of the first light transmitting layer. And a second light transmitting layer disposed on the lamination film for bonding.

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