JP2002127332A - Film for stretch label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film for a stretch label to be mounted on an outer periphery of a cylindrical article such as a bottle container, a horned article or an article with a smoothly curved surface utilizing a self-elasticity of the film, and excellent in a stretch property, printability, and scratch resistance. SOLUTION: The film for the stretch label has a thickness of 0.04 to 0.2 mm and is formed by a co-extrusion film having at least two layers comprising (1) an outer layer comprising a thermoplastic resin layer consisting of 50 wt.% or more of polypropylene and 50 wt.% or less of other polyolefin resin and (2) an inner layer consisting of a polyolefin resin containing 50 wt.% or more of a specific thermoplastic resin. The film having an outer layer thickness of 10 to 50%, an inner layer thickness of 30 to 90%, a longitudinal length of 15 mm and a lateral length of 100 mm is distorted to the lateral direction in a rate of 300 mm/min to obtain a strain of 10% or less and a permanent strain of 1.5% or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretch label film, and more particularly, to a film such as a bottle container or the like utilizing the self-stretch property of the film.
The present invention relates to a stretch label film having excellent stretchability, printability, heat resistance, and scratch resistance, which is attached to the outer periphery of a horny substance or an adherend having a gentle aspect.

[0002]

2. Description of the Related Art OPS, P
Shrink labels such as VC, full-surface container glued labels with glue applied on one side of the label, partial container glued labels with glue applied to a part of one side of the label, OP
There are non-adhesive labels such as P and stretch labels.

[0003] Of these, the stretch label has self-stretchability, and its dimensions can follow the shrinkage of the container due to the heat treatment of the container after the label is attached or the reduction of the contents of the container. The advantage is that PET (polyethylene terephthalate) and P
Since specific gravity difference separation is possible after crushing a plastic container such as VC (polyvinyl chloride), the container and the label can be easily separated and collected, and heat or an adhesive is not required.
Further, it is used as a container mounting label because the label cost is low.

Heretofore, this stretch label has usually been made of ethylene-vinyl acetate having a content of 3 to 8% by weight.
A vinyl acetate copolymer resin film was mainly used. However, this ethylene-vinyl acetate copolymer resin film is inferior in heat resistance and has a drawback that surface scratches and tears are liable to occur, and heat of about 90 ° C. is applied to a label for sterilization of container contents. In such cases, the ethylene-vinyl acetate copolymer resin has a low melting point and a large heat shrinkage, so that the label loses its elasticity during heat sterilization, the label slips off from the container, or a film due to heat shrinkage after cooling. There is a drawback that the label is apt to wrinkle due to the movement of the label and has poor heat resistance.

When the vinyl acetate content is increased in order to increase the stretchability (stretchability) of the ethylene-vinyl acetate copolymer resin film, the heat resistance further decreases,
There is a problem that stickiness increases. Therefore, if a large amount of lubricant is added to solve this problem, there is a problem that the printability and the bonding property are deteriorated. In any case, the ethylene-vinyl acetate copolymer resin film is required for a stretch label. It is not suitable as a material that meets the required characteristics.

As described above, the use of an ethylene-vinyl acetate copolymer resin as a material for a stretch label film is limited. Was found to be suitable as a material for stretch label films,
It has been clarified that an excellent stretch label film can be obtained by combining it with a specific resin (Japanese Patent Application Laid-Open No. 7-234638).

[0007]

An important feature of the present invention is to adopt a linear low-density polyethylene as a constitution of a film for a stretch label. A polyolefin resin containing 50% by weight or more and having a film density of 0.9 after being melt-extruded and not subjected to annealing.
10 to 0.935 g / cm ^3, which is excellent in stretchability, heat resistance, toughness, printability, and surface properties. Hard to scratch,
It is described as a stretch label film.

However, in the above prior art, as a material,
Although ethylene-vinyl acetate copolymer resin is used instead of linear low-density polyethylene, if the label is exposed to heat of about 90 ° C. due to sterilization of the contents of the container, it can withstand the heat and be used as a stretch label film. It is difficult to say that the label surface can fulfill the function described above, and that the abrasion resistance of the label surface at the time of transportation or transportation in the step of filling the contents is not sufficient.

In addition, JP-A-7-306463 and JP-A-8-47959 also disclose a technique in which linear low-density polyethylene is adopted as a material for a stretch label film. In addition, these are resistant to the case where heat of about 90 ° C is applied to the label to sterilize the contents of the container, etc., and deal with the abrasion resistance of the label surface during transportation and transportation in the filling process of the contents. The technology is unknown.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a stretch label film which is excellent in stretchability and printability, and further excellent in heat resistance and scratch resistance.

[0011]

Means for Solving the Problems The present invention has been proposed to achieve the above object, and is characterized by the layer structure of a laminated film constituting a stretch label. That is, according to the present invention, (1) the outer layer comprises a thermoplastic resin layer comprising 50% by weight or more of polypropylene and 50% by weight or less of other polyolefin resin, and (2) the inner layer comprises the following (2- 1) A polyolefin resin containing 50% by weight or more of at least one thermoplastic resin selected from the group consisting of (2-4) and formed of at least two layers of a coextruded film having a thickness of 0.04 Or 0.
A stretch label film having a thickness of 2 mm, wherein the thickness ratio of the outer layer is 10 to 50%, the thickness ratio of the inner layer is 30 to 90%;
At the moment when the stress in the hysteresis curve with the stress on the film and the strain as the axis becomes 0 when the strain when the 0 mm film is deformed in the horizontal direction at 300 mm / min is 25% of the length in the horizontal direction. A film for a stretch label characterized by having a distortion of 10% or less and a permanent distortion of 1.5% or less; (2-1) Linear low-density polyethylene polymerized using a multi-site catalyst having a resin density of 0.930 g / cm ³ or less, or polymerized using a single-site catalyst; (2-2) Resin density There 0.930 g / cm ³ or less of low density polyethylene; (2-3) a carboxylic acid concentration of 1 to 30 wt% of ethylene-.alpha., beta-unsaturated carboxylic acid copolymer, or ethylene - vinyl acetate copolymer; (2-4) an ethylene-α, β unsaturated carboxylic acid ester copolymer having a carboxylic acid ester concentration of 1 to 30% by weight;

Further, according to the present invention, there is provided the above stretch label film, wherein the polypropylene is polymerized using a multi-site catalyst or is polymerized using a single-site catalyst. .

According to the present invention, the surface layer to be printed is subjected to a corona discharge treatment, and the polymer constituting the layer contains a lubricant, an antiblocking agent, an antistatic agent and an antioxidant. The stretch label film described above, comprising at least one additive selected from the group consisting of:

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The feature of the present invention is that a specific polymer is adopted as a polymer constituting an outer layer and an inner layer of a stretch label film, and a thickness ratio between an outer layer and an inner layer of the film is specified and a predetermined ratio is determined. The point is that the value of the instantaneous strain and the value of the permanent strain under the conditions are set. As a result, a stretch label film having excellent stretchability and printability and further excellent heat resistance and scratch resistance can be obtained.

Hereinafter, the present invention will be specifically described. For ease of understanding, a stretch label for mounting a bottle container, which is a preferred use form of the stretch label, will be described with reference to the drawings as an example. As shown in FIG.
The stretch label film 10 to be mounted on a container is formed into a tubular shape by bonding both ends of a long film at a bonding portion 12 with an adhesive. The circumferential length (length in the horizontal direction) of the stretch label film (hereinafter, may be simply referred to as “film”) 10 for mounting the container is, for example, as shown in FIG. Container 16 shown in
The length of the film 10 is designed to be about 3 to 20% shorter than the maximum outer peripheral length, and the film 10 is cut so that the longitudinal direction of the film 10 becomes a desired length.

The film 10 usually has information on the contents printed on at least one surface, and is radially outwardly (in the direction of the arrow in FIG. 1B) by a stretching machine (not shown). For example, it is arranged outside the film mounting portion outer peripheral surface 14 of the container 16 in a state where the film is stretched by about 15 to 40%, and then, when the stretching state by the stretching machine is released, the container 16 contracts and the film mounting of the container body 16 is performed. It comes into close contact with the outer peripheral surface 14 (see FIG. 1C). The surface of the film 10 to be printed is:
It is preferable to perform a corona discharge treatment in order to enhance the adhesiveness of the printing ink. Also, when the film is formed into a cylindrical body, it is preferable that the end of the film is subjected to corona discharge treatment to enhance the adhesiveness.

<Invention according to claim 1> The first feature of the film 10 according to the present invention is that, in order to melt-extrude the film, (1) the outer layer [(a) may be referred to as a resin layer] A thermoplastic resin layer composed of 50% by weight or more of polypropylene and 50% by weight or less of another polyolefin resin, wherein (2) an inner layer (sometimes referred to as (b) a resin layer) comprises: (2-1) resin density Is a linear low-density polyethylene polymerized using a multi-site catalyst having a density of 0.930 g / cm ³ or less, or polymerized using a single-site catalyst; (2-2) a resin density of 0.930 g / cm ^3. (2-3) Ethylene-α, β-unsaturated carboxylic acid copolymer or ethylene-vinyl acetate copolymer having a carboxylic acid concentration of 1 to 30% by weight; (2-4) carboxylic acid Ester concentration of 1 to 3 By weight of at least two layers of a co-extruded film of a polyolefin resin containing at least one thermoplastic resin selected from the group consisting of ethylene-α, β-unsaturated carboxylic acid ester copolymer in an amount of 50% by weight or more. A formed stretch label film having a thickness of 0.04 to 0.2 mm, wherein the outer layer has a thickness ratio of 10 to 50%,
The thickness ratio of the inner layer is 30 to 90%, and the vertical length is 15
mm, a film with a lateral length of 100 mm
The strain when deformed at 00 mm / min is 2 times the length in the horizontal direction.
A stretch label wherein the strain at the moment when the stress in the hysteresis curve centered on the stress and strain on the film becomes 0 at 5% is 10% or less and the permanent strain is 1.5% or less. In the structure of the film.

The inner layer contains the polyolefin resin (2-1) to (2-4) in an amount of 50% by weight or more, preferably 70 to 100% by weight, and 50% by weight or less, preferably 0 to 30% by weight. It contains a polyolefin resin such as an ethylene-α-olefin copolymer.

The stretch label film of the present invention comprises:
It is composed of at least two layers of the outer layer / inner layer,
When it is composed of two or more layers such as outer layer / inner layer / outer layer or outer layer / inner layer / inner layer / outer layer, one outer layer is the outermost layer and the other outer layer is a surface to be attached to the adherend. In the aspect in which the inner layers are adjacent to each other, a polyolefin resin appropriately selected from the above (2-1) to (2-4) may be laminated adjacently.

When the stretch label film has a two-layer structure of an outer layer / inner layer, it becomes a label outer layer (a).
The resin layer imparts excellent heat resistance, printability and scratch resistance, and a property that the surface is not sticky, while maintaining the minimum stretchability (stretchability). In addition, the resin layer (b), which is the inner layer, has a minimum heat resistance,
Giving a large stretch (stretchability) to the film.

When the stretch label film has three or more layers such as outer layer / inner layer / outer layer or outer layer / inner layer / inner layer / outer layer, (b) a resin layer is laminated on both sides of the resin layer. By doing so, the heat resistance is significantly improved as compared with the case of (b) the resin layer alone, and the (b) resin layer alone having no scratch resistance has the scratch resistance as a multilayer film. In other words, almost no decrease in stretchability (stretchability) is observed.

The second feature of the stretch label film of the present invention is that the length in the vertical direction is 15 mm and the length in the horizontal direction is 10 mm.
When a 0 mm film is deformed in the transverse direction at 300 mm / min and the strain is 25% of the transverse length of the film 10, a hysteresis curve centered on the stress and strain on the film (see FIG. 2) ), The strain (point P in FIG. 2) at the moment when the stress becomes 0 is set to 10% or less, and the permanent strain is set to 1.5% or less. Thereby, sufficient stretchability (stretchability) as a stretch label can be obtained. Here, the vertical direction is the direction in which the film is formed and the horizontal direction is the direction orthogonal to the direction in which the film is formed.

Under the above conditions, the instantaneous distortion of the film is 10% or less and the permanent distortion is 1.5% or less.
The time to shrink to 3% of the label is within 1 minute, and the mounting compatibility with the container mounting position is obtained. On the other hand, when the instantaneous strain exceeds 10% or the permanent strain exceeds 1.5%, the shrinkage recovery time of the film becomes long, and after the label is attached, the label is shifted from a fixed position in the next step, Eventually, there arises a problem that the film does not adhere firmly to the outer peripheral surface of the adherend, or a yield point occurs in the film when the label is attached, and a stretched portion is likely to be partially generated.

<(A) Resin Layer (Outer Layer)> The polymer constituting the outer layer in the stretch label film of the present invention comprises 50% by weight or more of polypropylene and 50% by weight or less of other polyolefin resin. Polypropylene refers to not only propylene homopolymer, but also 85
It contains a copolymer of propylene in an amount of 2% by weight or more and an α-olefin having 2 to 8 carbon atoms. As the α-olefin, ethylene, butene-1, pentene-1, hexene-1, 4-methyl-1-pentene, octene-1
Alternatively, these are mixtures, and among them, ethylene and butene-1 are preferably used.

Examples of the polyolefin resin blended with the above polypropylene include ethylene-α-olefin copolymer, low-density polyethylene, linear low-density polyethylene, polybutene-1, butene-1-α-olefin copolymer and the like. No. The mixing ratio of polypropylene and other polyolefin resin is 50% for polypropylene.
To 100% by weight, preferably 70 to 100% by weight, and 0 to 5% of the other polyolefin resin.
0% by weight, preferably 0 to 30% by weight.

The polypropylene may be a homopolymer, a random copolymer having the above-mentioned composition or a block copolymer. By adopting the above polymer as the outer layer of the stretch label film, the melting point of about 162 ° C. for homopolymer and about 138 for random copolymer
° C, for example, resin density 0.920 g / cm
Heat resistance far exceeding the melting point of about 122 ° C. of the linear low density polyethylene of No. ³ can be imparted to the film. Further, polypropylene can impart scratch resistance to a film as compared with polyethylene in terms of surface hardness.

<(B) Resin Layer (Inner Layer)> As the (b) resin layer constituting the inner layer laminated with the outer layer, a resin site having a resin density of 0.930 g / cm ³ or less is used. Linear low-density polyethylene polymerized or polymerized using a single-site catalyst; low-density polyethylene having a resin density of 0.930 g / cm ³ or less; ethylene having a carboxylic acid concentration of 1 to 30% by weight.
an α, β unsaturated carboxylic acid copolymer or an ethylene-vinyl acetate copolymer; an ethylene-α, β unsaturated carboxylic acid ester copolymer having a carboxylic acid ester concentration of 1 to 30% by weight; A polyolefin resin containing 50% by weight or more of at least one of these is used.

When the linear ultra-low density polyethylene is adopted as the polyolefin resin, or the carboxylic acid concentration of ethylene-α, β unsaturated carboxylic acid copolymer or ethylene-vinyl acetate copolymer or ethylene- When the carboxylic acid ester concentration of the α, β unsaturated carboxylic acid ester copolymer is high, the stretchability of the film is very large, but the stickiness is also very large. However, by laminating the specific (a) resin layer as a surface layer of these (b) resin layers, the obtained film has almost no loss in stretchability.
Stickiness of the surface can be suppressed. Thereby, the film for a stretch label of the present invention in which the (a) resin layer and the (b) resin layer are laminated can realize any physical property in consideration of heat resistance, scratch resistance, and stretch property.

(B) The density of the linear low-density polyethylene or low-density polyethylene in the resin layer is 0.930 g / cm.
If it exceeds ³ , a yield point occurs and the film becomes hard, so that it cannot be used as a stretch label film. The carboxylic acid concentration of the ethylene-α, β unsaturated carboxylic acid copolymer or the ethylene-vinyl acetate copolymer or the carboxylic acid ester concentration of the ethylene-α, β unsaturated carboxylic acid ester copolymer exceeds 30% by weight. In this case, a large stretch property can be obtained, but not only the film becomes too flexible, but also problems such as an increase in the price of the film occur. Further, (b) the amount of surface bleed is reduced due to the absorption of the lubricant into the resin layer, resulting in extremely poor slipperiness. As the polymer to be blended with the polyolefin resin, ethylene-α-
Olefin copolymers and the like can be mentioned.

When the thickness of the film is less than 0.04 mm, the film tends to be stretched in the vertical direction due to low stress, the register accuracy during printing is deteriorated, and the film is easily broken. Film thickness 0.2
If it exceeds mm, the stretching stress at the time of mounting the container becomes too large. (A) The thickness ratio of the resin layer is 50%.
Or (b) the thickness ratio of the resin layer is 3
If it is less than 0%, a yield point occurs and the film becomes hard, so that it cannot be used as a stretch label film. Conversely, (b) the thickness ratio of the resin layer is 9
If it exceeds 0%, sufficient stretchability can be obtained, but it is difficult to control the balance between the surface slipperiness, printability, and bonding strength.

<Invention of Claim 2> (a) The polypropylene used as the resin layer may be either one polymerized using a multi-site catalyst or one polymerized using a single-site catalyst. it can. Polypropylene polymerized using a multi-site catalyst has a characteristic that it has good processability and good compatibility with other polyolefin resins because it tends to have a wide molecular weight distribution and a wide composition distribution. In addition, polypropylene polymerized using a single-site catalyst has good transparency, high rigidity, and low slippage even with a small amount of lubricant because the molecular weight distribution is narrow and the composition distribution is uniform. It has a feature that bleeding during high-temperature aging is small, and any one may be appropriately selected according to required physical properties.

<Invention of Claim 3> The surface layer to be printed is preferably subjected to a corona discharge treatment in order to improve the printability. (A) When the resin layer is not slippery, the label surface is prevented from being damaged or torn during the production line process or transportation due to contact between the containers or the case. It is preferable to add a lubricant in order to impart more appropriate slip properties.

Examples of the lubricant include at least one selected from the group consisting of higher fatty acids, higher fatty acid amides, higher fatty acid metal salts, fatty acid esters, and aliphatic alcohols. On the other hand, 0.
It may be about 04 to 0.20% by weight. By adding this lubricant, not only can the label surface be imparted with a more appropriate slip property, but also the ink adhesion strength and the label bonding strength can be increased, so that the label surface is not scratched and tear resistant. It will be excellent in property.

In the stretch label film of the present invention, when the (b) resin layer is formed of a linear ultra-low density polyethylene or a resin having a high carboxylic acid or carboxylic acid ester concentration (15% by weight or more). In (2), the amount of surface bleed tends to decrease due to the absorption of the lubricant into the resin layer (b). Therefore, in order to make the lubricant bleed moderately to improve the slip, it is necessary to add a relatively large amount of the lubricant.

However, when a large amount of lubricant is used, bleeding causes poor printing ink adhesion, poor label bonding,
It may cause undesired phenomena such as opacity. In such a case, about 0.05 to 1% by weight of an inorganic antiblocking agent such as silica or talc can be added to the resin layer (a). However, the addition of an antiblocking agent may impair transparency and aesthetics, and it is desirable to reduce the amount of use as much as possible.

Further, the surface layer of the stretch label film is provided with a known antistatic agent and / or a known antistatic agent in order to prevent the workability from being impaired by the electrification of the film, or to suppress the oxidative deterioration of the film itself. Alternatively, an antioxidant may be appropriately blended. The compounding amount of the antistatic agent and the antioxidant is usually about 0.1 to 1.0% by weight based on the added resin layer. As a method for producing a film, there are an inflation method and a T-die method, and any of them may be adopted as necessary.
The T-die method is preferred.

As apparent from the above description, the stretch label film prepared according to the present invention is
A stretch label film for attaching to an adherend, which is excellent in stretchability, printability, moderate slipperiness, heat resistance, and excellent scratch resistance.

[0038]

According to the present invention, a stretch label which is excellent in stretchability and printability, has an appropriate sliding property, is excellent in heat resistance and scratch resistance, is hardly scratched on the surface, and has less stickiness. A film can be provided.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. This example is intended to disclose a preferred embodiment of the present invention, but is not intended to limit the present invention. The measurement and evaluation of the physical properties of the stretch label film were performed by the following methods.

Hysteresis (25% strain) Strain at zero stress: According to the chart of FIG. Permanent strain: Calculated from the distance between the evaluation lines before the test due to hysteresis and the dimensional change 24 hours after the end of the test. -Stretchability: The label was firmly adhered to the container, and it was examined whether or not the label was distorted in response to a change in the internal pressure of the container, and evaluated according to the following criteria. 〇 is firmly adhered to the container and no distortion is seen on the label; × is distortion is seen on the label; ・ Beauty and transparency: 〇 is glossy and transparent on the film surface △ indicates that the transparency of the film surface is slightly inferior; ・ The adhesion state of the ink ・ The bonding state of the film: 〇 indicates that the ink peels off from the film when a cellophane tape is applied to the printing surface and peeled off No, the label joint cannot be easily peeled off by hand; ② indicates that when the cellophane tape was applied to the printing surface and the film was peeled off, there was slight peeling of the ink from the film, and the label joint was peeled by hand. The part where the rubbing occurred; ×
Is the one where the ink peeled off from the film when the cellophane tape was applied to the printing surface and peeled off, and the label joint was easily peeled off by hand; ・ Heat resistance: PET with water label attached 90 ° C container
Was immersed in warm water for 30 minutes, and the appearance of the label after cooling with water was evaluated. 〇, no poor appearance was observed; ×
Had poor appearance such as wrinkles and shape changes on the label. ・ Scratch resistance: Twelve PET containers fitted with water-filled labels were put in a plastic case, and the truck was actually transported for 1200 km. The label was inspected for surface scratches and tears. 〇 indicates that scars were scarcely observed; △ indicates that microscratches are included; X indicates that those that include large scuffs or tears are included;

In film forming, inflation processing is air cooling, and T-die processing is cast molding.

< Example 1 > (a) As a resin layer, a film obtained by adding 0.08% by weight of a higher fatty acid amide and 0.5% by weight of a silica-based antiblocking agent to random polypropylene was used as a three-layer laminated film. Both outer layers, and (b) a resin layer having a density of 0.
A linear low-density polyethylene polymerized using an 898 g / cm ³ single-site metallocene catalyst was used as an intermediate layer, and a film having a thickness ratio of 1/4/1 and a total thickness of 100 μm was co-formed by a T-die method. Extruded. One side was subjected to corona discharge treatment. Gravure printing is performed on the corona discharge treated surface of this film, and then corona discharge treatment is performed in the longitudinal direction of the end of the film on the non-printed surface, the part is coated with an adhesive, joined to the other end, and the label is A cylindrical film having a peripheral length of 288 mm and cut to a length of 110 mm in the longitudinal direction so that the inner surface becomes a printing surface, a peripheral film having a peripheral length of 3 mm.
It was mechanically stretched by 25% in a 00 mm polyester container and mounted. Table 1 shows the composition and forming method of the film.
Table 2 shows the physical properties of the obtained film.

< Examples 2 to 5, Comparative Examples 1 to 5 >
With the configuration shown in Table 1, a stretch label was molded in the same manner as in Example 1. Table 2 shows the physical properties of the obtained film.

[0044]

[Table 1] ・ * A ・ B: Anti-blocking agent ・ R-PP: Random polypropylene ・ LLDPE: Linear low density polyethylene ・ m-LLDPE: Linear low density polyethylene polymerized using single-site catalyst ・ EVA: Ethylene -Vinyl acetate copolymer ・ Values in parentheses are density or concentration of vinyl acetate (% by weight)

[0045]

[Table 2]

[Brief description of the drawings]

FIG. 1A is a perspective view of a stretch label film, FIG. 1B is a perspective view showing a state immediately before the film is mounted on a container, and FIG. 1C is a state in which the film is mounted on the container. It is a perspective view showing a state.

FIG. 2 is a hysteresis curve centered on the stress and strain of the film according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Film 12 Film bonding part 14 Film mounting part outer peripheral surface 16 Container body

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/00 C08K 5/00 C08L 23/10 C08L 23/10 G09F 3/00 G09F 3/00 D E 3 / 04 3/04 C // (C08L 23/10 (C08L 23/10 23:02) 23:02) (72) Inventor Yotaro Koshi 2-27-9 Minamiikebukuro, Toshima-ku, Tokyo F-term (Ref.) JL00C JL08A JL08B YY00A YY00B 4J002 BB03W BB03X BB04X BB05X BB06Y BB07Z BB08Y BB12W BB14W BB15W BP03W DJ016 DJ046 EC066 EF056 EG016 EH036 EP016 FD076 FD106 FD176 FD176 206

Claims (3)

[Claims] (1) The outer layer comprises a thermoplastic resin layer comprising 50% by weight or more of polypropylene and 50% by weight or less of other polyolefin resin. (2) The inner layer comprises the following (2-1) to (2-4) Formed from at least two layers of a co-extruded film made of a polyolefin resin containing 50% by weight or more of at least one thermoplastic resin selected from the group consisting of: A stretch label film having a thickness of 2 mm, wherein the thickness ratio of the outer layer is 10 to 50% and the thickness ratio of the inner layer is 30 to 90%; a film having a length of 15 mm in the vertical direction and a length of 100 mm in the horizontal direction is 300 mm in the horizontal direction. When the strain at the time of deformation at 25 / min is 25% of the length in the horizontal direction, the strain at the moment when the stress in the hysteresis curve on the axis of the stress and strain on the film becomes 0 is 10%. Hereinafter, the permanent strain of 1.5% or less; for stretch label characterized in that it is a film. (2-1) Linear low-density polyethylene polymerized using a multi-site catalyst having a resin density of 0.930 g / cm ³ or less, or polymerized using a single-site catalyst; (2-2) Resin density There 0.930 g / cm ³ or less of low density polyethylene; (2-3) a carboxylic acid concentration of 1 to 30 wt% of ethylene-.alpha., beta-unsaturated carboxylic acid copolymer, or ethylene - vinyl acetate copolymer; (2-4) an ethylene-α, β unsaturated carboxylic acid ester copolymer having a carboxylic acid ester concentration of 1 to 30% by weight; 2. The stretch label film according to claim 1, wherein the polypropylene is polymerized using a multi-site catalyst or polymerized using a single-site catalyst. 3. A surface layer to be printed is subjected to a corona discharge treatment, and a polymer constituting the layer is selected from the group consisting of a lubricant, an antiblocking agent, an antistatic agent and an antioxidant. 2. The composition of claim 1, comprising at least one additive.
Or the stretch label film according to 2.