Resin laminate

Abstract

The invention provides a resin laminate having relatively high surface hardness and high transparency. The resin laminate has a hard resin layer and a substrate layer. The hard resin layer is formed by a curing resin composition with multi-functional(methyl)acryloyl monomers as an essential ingredient, has a three-dimensional cross-linking structure and a thickness of 25 [mu]m-250[mu]m. The substrate layer is formed by a monolayer thermoplastic resin or two or more layers of a multi-layer thermoplastic resin. An independent tensile elasticity modulus of the hard resin layer is 2.000-4,000 MPa; and a total light transmittance is over 90%. Besides, a ratio (t1/t2) of a total thickness (t1) of the substrate layer to the thickness (t2) of the hard resin layer is 0.25-10; and a Bierbaum scratch hardness of the resin laminate is 20 kg/mm<2>-700 kg/mm<2>.

Description

technical field [0001] The present invention relates to a resin laminate having excellent surface hardness, transparency, and moldability, and particularly to a resin laminate suitable for a display panel as a transparent multilayer sheet. Background technique [0002] In electronic equipment such as digital cameras and mobile phones, as substrates of liquid crystal displays, etc., or as protective plates for protecting the surface of liquid crystal displays from scratches, contamination, etc., acrylic, polycarbonate, poly Laminates made of thermoplastic resins such as ethylene phthalate. These laminated resins have excellent optical properties and are less prone to cracking than glass, and thus have come to be widely used in fields where glass has been conventionally used in recent years. However, thermoplastic resins such as acrylic, polycarbonate, and polyethylene terephthalate have disadvantages in that surface hardness, abrasion resistance, and scratch resistance are i...

AI Technical Summary

Problems solved by technology

[0005] However, in the examples shown as specific examples of these methods, a polyethylene terephthalate film and a cellulose triacetate film, which are inherently higher in pencil hardness than polycarbonate resins, are used as base materials, thereby making The pencil hardness reaches 4H to 6H. Although this effect is confirmed, the pencil hardness cannot be achieved only with a thin hard coating layer, so a hard base layer and auxiliary functions of inorganic materials are required

Therefore, these base layers and inorganic materials become important factors that hinder transparency, and are not suitable for display devices such as liquid crystal displays.

[0006] In addition, an attempt has been made to form two layers of a coating film made of an ultraviolet curable resin with a specific film thickness on a polycarbonate resin substrate using polycarbonate resin, which is a resin with low pencil hardness. UV-curable resins contain difunctional urethane acrylates, polyfunctional oligomers, polyfunctional monomers, monofunctional monomers, and have a specific number of functional groups, but the maximum pencil hardness in this technology is 4H, and it does not Sufficient (refer to Patent Document 7)

[0007] In addition, the above-mentioned Patent Document 7 evaluates the scratch hardness measured by the pencil method based on JIS K5600-5-4, and the structure in which a hard coat layer and a hard resin layer are laminated on a thermoplastic resin layer depends on the thermoplastic resin and the hard resin layer. Depending on the nature and thickness of the resin layer, it is affected by the thermoplastic resin as the lower layer, and plastic deformation and elastic deformation caused by dents occur. At first glance, it is difficult to distinguish whether the surface is just a dent or a scratch caused by a scratch.

In addition, depending on the material of the hard resin layer, cracks may occur due to deformation caused by unexpected dents, and it is difficult to measure the correct surface hardness only by measuring the hardness of a pencil.

In addition, when used as a protective plate for liquid crystal displays, etc. as mentioned above, it is necessary to consider the protection of scratches caused by harder metals and minerals in daily life, so it is necessary to use pencils that are softer than metals and minerals I am very worried about the difference between the wear resistance and scratch resistance in actual daily life.

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