JP2006205478A - Transparent resin laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transparent resin laminate which is excellent in impact resistance, scratch resistance, and fluoroscopy properties while its appearance is not spoiled and in which a surface layer part of an acrylic resin is laminated/integrated on/with a base layer part of a polycarbonate resin by a coextrusion method. <P>SOLUTION: In the transparent resin laminate, the base layer part and the surface layer part are laminated/integrated by the coextrusion method. The base layer part contains 0.01-1 pt.wt. of a fatty acid ester per 100 pts.wt. of the polycarbonate resin. The surface layer part contains 0.01-1 pt.wt. of at least one selected from a fatty acid ester, a fatty acid amide, and a higher alcohol per 100 pts.wt. of an acrylic resin and has a thickness of 10-40 μm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention mainly relates to a transparent resin laminate having excellent transparency, which is used as a protective face plate for display units of various electronic / electrical devices, OA devices, portable mobile devices, industrial machine parts, and the like.

  In general, various electronic / electrical devices, OA devices, portable mobile devices, industrial machine parts, etc. are provided with a display unit such as a liquid crystal display. The display unit usually has a thickness of 0.3 mm to 3 mm as a protective face plate. A transparent face plate of a degree is used. This face plate is not only excellent in secondary workability such as cutting and drilling, impact resistance during use, and scratch resistance, but also has excellent transparency so that the displayed content can be clearly seen. It is required to be.

  Conventionally, acrylic resin plates have been frequently used as the face plate for reasons of excellent secondary processability, transparency and scratch resistance, but there is a problem of poor impact resistance. On the other hand, polycarbonate resin is mentioned as a transparent resin material excellent in impact resistance, but there is a problem that polycarbonate resin is inferior in scratch resistance.

Therefore, it has been studied to co-extrusion a resin composition comprising a transparent polycarbonate resin excellent in impact resistance and an acrylic resin excellent in scratch resistance, and to laminate and integrate the acrylic resin layer on the polycarbonate resin layer. (For example, see JP-A-11-058627).
JP 11-058627 A

  However, when manufacturing a resin laminate of polycarbonate resin and acrylic resin by coextrusion molding method, due to the difference in thermal characteristics when polycarbonate resin and acrylic resin are melted, the extruded molten resin sheet There was a problem that this mirror surface was not well transferred to the sheet, and it was not possible to obtain a resin laminate having high transparency without perspective distortion or the like. .

  The present invention solves the above-mentioned problems, has excellent impact resistance and scratch resistance, and has excellent transparency without losing its appearance, and the surface layer of acrylic resin is coextruded on the base layer of polycarbonate resin. An object of the present invention is to provide a transparent resin laminate laminated and integrated by the above.

  The present invention is a transparent resin laminate in which a base layer part and a surface layer part are laminated and integrated by a co-extrusion molding method, wherein the base layer part is 0.01 to 1 fatty acid ester relative to 100 parts by weight of the polycarbonate resin. A composition comprising 0.01 part by weight of at least one component selected from a fatty acid ester, a fatty acid amide, and a higher alcohol with respect to 100 parts by weight of an acrylic resin. The gist of the transparent resin laminate is characterized in that the thickness of the surface layer portion is in the range of 10 μm to 40 μm.

  As described above, the transparent resin laminate of the present invention is obtained by laminating and integrating a surface layer portion of an acrylic resin on a base layer portion of a polycarbonate resin by a coextrusion molding method. A fatty acid ester is added to the polycarbonate resin of the base layer portion. The mirror surface of the polishing roll is satisfactorily transferred to the surface of the co-extruded laminate by adding a specific amount and adding a specific amount of a component selected from fatty acid ester, fatty acid amide, and higher alcohol to the acrylic resin in the surface layer. Accordingly, it is possible to obtain a resin laminate having high transparency without perspective distortion and having excellent impact resistance and scratch resistance.

  The polycarbonate resin used in the present invention is produced, for example, by a phosgene method by reaction of dihydric phenol and phosgene or a melt polymerization method by reaction of dihydric phenol and carbonic acid diester. As the dihydric phenol, it is preferable to use bisphenols, particularly 2,2-bis (4-hydroxyphenyl) propane (common name: bisphenol A). Moreover, it is preferable to use diphenyl carbonate as the carbonic acid diester.

  Examples of the acrylic resin used in the present invention include various acrylic resins such as polymethyl methacrylate and copolymers mainly composed of methyl methacrylate. Examples of other monomers that can be copolymerized with methyl methacrylate include alkyl methacrylates having an alkyl group having 2 to 8 carbon atoms such as ethyl methacrylate, propyl methacrylate, butyl methacrylate, octyl methacrylate, methyl acrylate, and ethyl acrylate. Alkyl acrylates having an alkyl group having 1 to 8 carbon atoms, such as propyl alkylate, butyl alkylate, octyl alkylate, methacrylic acid, acrylic acid, methacrylamide, acrylamide, styrene, glycidyl methacrylate, glycidyl acrylate, and the like A mixture etc. are mentioned.

  The fatty acid ester is a partial ester or a total ester of a monohydric or polyhydric alcohol and a saturated fatty acid. Such fatty acid esters include stearic acid monosorbate, behenic acid monoglyceride, pentaerythritol monostearate, pentaerythritol tetrastearate, propylene glycol monostearate, ethylene glycol monostearate, stearyl stearate, palmityl palmitate, butyl Examples include stearate, methyl laurate, isopropyl palmitate, and 2-ethylhexyl stearate.

  Examples of fatty acid amides include oleic acid amide, ethylene bis stearic acid amide, stearic acid amide, and palmitic acid amide. Examples of higher alcohols include stearyl alcohol, lauryl alcohol, olein alcohol, and the like.

  As a composition of the base layer part of this invention, it is necessary to contain the said fatty acid ester in the range of 0.01-1 weight part with respect to 100 weight part of said polycarbonate resins. Fatty acid esters may be used alone or in combination of two or more. When the content of the fatty acid ester is less than 0.01 parts by weight, when coextrusion molding is performed, the mirror surface of the mirror-finished polishing roll is not stably transferred to the extruded sheet, and high transparency is not obtained. If the ester content exceeds 1 part by weight, the bondability at the interface between the surface layer part and the base layer part is inferior, and the perspective distortion at the laminated interface occurs, and as a result, the transparency cannot be ensured. Here, in addition to the fatty acid ester, the mirror surface of the polishing roll is stably transferred to the sheet even if a compound having an effect of imparting lubricity to the resin, such as fatty acid amide, higher alcohol, is added to the polycarbonate resin. And high transparency cannot be obtained.

  The polycarbonate resin may appropriately contain various conventionally known additives such as an ultraviolet absorber, an antioxidant, a flame retardant, an antistatic agent, and a colorant.

  As a composition of the surface layer part of the present invention, it is necessary to contain 0.01 to 1 part by weight of at least one component selected from the above fatty acid ester, fatty acid amide, and higher alcohol with respect to 100 parts by weight of the acrylic resin. is there. If less than 0.01 parts by weight, the mirror surface of the mirror-finished polishing roll is not stably transferred to the sheet when coextrusion molding is performed, and high transparency is not obtained. This is not preferable because the bondability at the interface between the base layer portions is inferior and the perspective distortion occurs at the laminated interface, and as a result, the transparency cannot be ensured.

  The acrylic resin may appropriately contain various conventionally known additives such as an ultraviolet absorber, an antioxidant, a flame retardant, an antistatic agent, and a colorant. Further, a rubber component may be contained by a conventionally known method to improve the impact resistance of the acrylic resin plate.

  Considering that the transparent resin laminate of the present invention is used as a protective face plate for display parts of various electronic and electrical devices having a thickness of about 0.3 to 3 mm, the surface thickness of this laminate is 15 to 40 μm. It is preferable to be within the range. If it is less than 15 μm, it is inferior in scratch resistance, and if it exceeds 40 μm, it is inferior in impact resistance.

  For the coextrusion molding for obtaining the transparent resin laminate of the present invention, a known coextrusion molding method usually used for manufacturing a thermoplastic resin multilayer board or multilayer film is employed. For example, an acrylic resin surface layer on a polycarbonate resin base layer by a feed block method in which a heat-melted resin composition is laminated before inflow of a T-die or a multi-manifold method in which resin materials are laminated inside a T-die. The transparent resin laminated body provided with can be obtained.

  The obtained transparent resin laminate has a flat plate shape, but may be processed into a curved surface by thermoforming according to the application, and further anti-fogging treatment and antistatic treatment for the surface layer by known techniques. Further, surface modification such as conductive treatment and surface hardening treatment can be performed.

Examples of the present invention will be described below together with comparative examples. The raw materials used are as follows.
Polycarbonate resin: Trade name “E-2000”, Mitsubishi Engineering Plastics Acrylic resin: Trade name “Sumipex EX”, Sumitomo Chemical Co., Ltd. Fatty acid ester: Trade name “VLTN-4” (ethylene glycol monostearate), Kawaken Fine alcohol manufactured by Fine Chemical Co., Ltd .: Trade name “Calcoal 8688” (stearyl alcohol), manufactured by Kao Corporation Fatty acid amide: Trade name “Nutron-2” (stearic amide), manufactured by Nippon Seika Co., Ltd.

<Examples 1-6, Comparative Examples 1-10>
As shown in Tables 1 to 3, the base layer part and each raw material of the surface layer part are weighed (the numerical values of each raw material in the table indicate parts by weight), mixed, and then mixed with a vent type single screw extruder having an inner diameter of 50 mmφ. The raw material was melt-kneaded with the raw material and the surface layer raw material in a vent type single-screw extruder with an inner diameter of 30 mmφ, and then extruded from a feed block type T-die. The transparent resin laminated board which laminated | stacked and integrated the surface layer of the acrylic resin on the base layer of polycarbonate resin as shown in 3 was obtained.

The following evaluation was performed about the obtained transparent resin laminated board. The result was combined with Tables 1-3, and was shown.
Permeability: Observed whether or not there is a perspective distortion by visual observation, the circle having no perspective distortion was marked with ◯, and that with perspective distortion was marked with X.
Impact resistance: A DuPont impact test was performed with a load of 5 kg and an impact core of 1/2 inch R, and the height at which the transparent resin laminate was not broken was measured.
Scratch resistance: Pencil hardness was measured in accordance with JIS K5400 under a load condition of 200 g.

<Reference example>
Each of the polycarbonate resin and the alkali resin was subjected to extrusion molding, and the above evaluation was performed on the obtained resin plate.

  As shown in Tables 1 to 3, in Examples 1 to 6 which are within the technical scope of the present invention, the obtained transparent resin laminate has good transparency, and is excellent in impact resistance and scratch resistance. .

  On the other hand, in Comparative Examples 1 to 4 in which the content of fatty acid ester, fatty acid amide, or higher alcohol blended in the polycarbonate resin or alkali resin is not within the technical scope of the present invention, the transparent resin laminate has good transparency. Could not get. Further, in Comparative Example 5 and Comparative Example 6 in which the thickness of the surface layer part deviated from the technical scope of the present invention, the result was inferior in scratch resistance or impact resistance.

  Furthermore, in Comparative Example 7 or Comparative Example 8 in which fatty acid amides other than fatty acid esters or higher alcohols were blended in the polycarbonate resin base layer, a transparent resin laminate having good transparency could not be obtained. Moreover, high transparency can be obtained also in Comparative Example 9 in which fatty acid ester, fatty acid amide, or higher alcohol is not blended in the composition of the surface layer portion, and in Comparative Example 10 in which fatty acid ester is not blended in the composition of the base layer portion. There wasn't. That is, in order to obtain the transparent resin laminate of the present invention, it is necessary to blend the above compounds in both the surface layer portion and the base layer portion.

Claims (1)

  A transparent resin laminate in which a base layer part and a surface layer part are laminated and integrated by a coextrusion molding method, wherein the base layer part contains 0.01 to 1 part by weight of a fatty acid ester with respect to 100 parts by weight of a polycarbonate resin. The surface layer part is composed of 0.01 to 1 part by weight of at least one component selected from fatty acid esters, fatty acid amides, and higher alcohols with respect to 100 parts by weight of the acrylic resin, A transparent resin laminate, wherein the thickness of the surface layer is in the range of 10 μm to 40 μm.