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Transparent plastic sheet

A technology of transparent plastic sheets and sheets, which can be used in electronic equipment, other household appliances, synthetic resin layered products, etc., and can solve the problems of high deformation, low light resistance and surface performance.

Inactive Publication Date: 2017-05-17
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sheets constructed so that PC and PMMA are stacked are considered to be somewhat successful in achieving transparency, surface hardness, durability, and heat resistance, but high deformation, low light resistance, and surface Performance remains a challenge

Method used

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  • Transparent plastic sheet
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049] PC resin (LC Chemicals) with a glass transition temperature of 147°C and PMMA resin with a glass transition temperature of 129°C (terpolymer PMMA resin, 15% to 70% styrene, 25% to 80% formazan) were prepared. methacrylate and 5% to 50% maleic anhydride). In addition, the barrel diameter of the extruder for forming the support layer was 150 mm, the screw L / D=35, the barrel temperature was 270° C., and the barrel diameter of the extruder for forming the surface layer was 45 mm, and the screw L / D=35. D = 35, the cylinder temperature is 245°C. Subsequently, the PC resin was introduced into the extruder for forming the support layer, and the PMMA resin was fed into the extruder for forming the surface layer, and the two resins were simultaneously melt-extruded.

[0050] The internal temperature of a die pad was set at 270° C. and 245° C., and the stacked and integrated resin in the die was guided through three polishing rolls which were mirror-polished and arranged in a hor...

example 2 and 3

[0052] The transparent plastic sheets of Examples 2 and 3 were produced in the same manner as Example 1, except that a terpolymer PMMA resin with a glass transition temperature of 120° C. and a terpolymeric resin with a glass transition temperature of 130° C. were used, respectively. Material PMMA resin.

example 4

[0054] Co-extrusion was carried out in the same manner as in Example 1, except that as an extruder for forming the support layer, a first extruder (barrel diameter of 150 mm, screw L / D=35, barrel temperature of 270 ℃), the second extruder (barrel diameter is 45mm, screw L / D=35, barrel temperature 245°C) and the third extruder (barrel diameter is 45mm, screw L / D=35, barrel temperature 245°C ℃), and the PC resin, the terpolymer PMMA resin and the PC resin were sequentially fed into the extruder to form a supporting layer. The extrusion speeds of the first extruder, the second extruder, the third extruder, and the sub-extruder were set at a weight ratio of 70:15:15, and thus a transparent plastic sheet (thickness 1 mm) was Manufactured as: the surface layer is 0.15mm thick, and the thickness of the first support layer (PC, bottom layer), the second support layer (PMMA, middle layer) and the third support layer (PC, boundary layer) are 0.1mm, 0.15mm, respectively and 0.6mm.

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Abstract

The present invention provides a transparent plastic sheet comprising: a support layer including a polycarbonate resin layer; and a polymethylmethacrylate resin layer, which is formed as a surface layer on the support layer and has a glass transition temperature of 120-135degrees centigrade, wherein the thickness of the polymethylmethacrylate resin layer is 5-20% of the total thickness of the sheet, and the overall transmittance of the sheet is 89-94% based on ASTM D1003. Therefore, the deformation of the transparent plastic sheet can be minimized under high-temperature and high-humidity conditions, and thus the transparent plastic sheet can be favorably applied, as a window cover for glass replacement, to various display products.

Description

technical field [0001] The present invention relates to a transparent plastic sheet, and more particularly to a plastic sheet having a multilayer structure, which can be used as a cover for protecting the front surface of a display. Background technique [0002] Glass materials are mainly used as conventional display materials for liquid crystal display panels, plasma display panels, electroluminescence fluorescent display tubes, or electrode substrates of light emitting diodes. However, glass is easily broken and has a high specific gravity, and has limited utility in achieving slimness and lightness, making it unsuitable for flexible displays. Therefore, transparent plastic materials used as substitutes for glass materials are attracting attention. Plastic materials are lightweight, difficult to break, and capable of reducing manufacturing costs, so they are expected to exhibit high competitiveness in conventional fields where glass is used. [0003] In particular, vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36
CPCB32B27/36B32B27/365B32B27/308B32B2250/40B32B2307/30B32B2307/412B32B2307/536B32B2307/546B32B2307/7265B32B2307/732B32B2307/734B32B2457/20B32B27/08B32B27/30
Inventor 杜俊吉沈相和赵春星
Owner KOLON IND INC
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