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High hardness multi-layer sheet

A multi-layer, high-hardness technology that is applied to layered products, synthetic resin layered products, and electronic equipment. It can solve problems such as weak impact resistance and achieve easy application, excellent dimensional stability, and excellent bending properties. Effect

Inactive Publication Date: 2016-06-22
LG HAUSYS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a raw material used in conventional mobile devices, liquid crystal windows made of polymethyl methacrylate (PMMA) resin as the main raw material have excellent weather resistance and scratch resistance, but there is a problem of weak impact resistance. Recently, with the The popularity of ultra-thin mobile devices and the proliferation of large liquid crystal displays (LCDs) have highlighted the shortcomings of existing polymethyl methacrylate resins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0071] Polymethyl methacrylate-1 (acrylic copolymer)

[0072] With 83 parts by weight of methyl methacrylate (MMA), 2 parts by weight of styrene, 15 parts by weight of N-cyclohexylmaleimide, 0.2 parts by weight of n-octyl mercaptan as a chain transfer agent and as 0.1 parts by weight of the azobisisobutyronitrile (AIBN) mixed solution of the polymerization initiator is put into the aqueous dispersant solution (250 parts by weight of ion-exchanged water + 2 parts by weight of the polymerization dispersant), and polymerized at 80°C for 4 hours , and further polymerized at 110° C. for 2 hours to remove residual monomers and then dried to prepare polymethyl methacrylate-1 (acrylic copolymer) in the form of beads. The polymethyl methacrylate-1 had a molecular weight of 130,000 and a Tg of 132°C.

[0073] Polymethylmethacrylate-2 (acrylic copolymer)

[0074] In addition to changing the N-cyclohexylmaleimide in the preparation method of the above-mentioned polymethyl methacryla...

experiment example

[0086] Experimental example: Physical property evaluation of multilayer structure

[0087] 1) Pencil hardness: The hardness of the said Example and the comparative example was measured using ASTM D3363-05 (Mitsubishi pencil, 1 kg load).

[0088] 2-1) Initial curvature: After making the high-hardness multilayer sheets of the above-mentioned examples and comparative examples into test pieces with a width of 60 mm and a height of 100 mm, measure the height of the corners and the bottom surface, and use a gap gauge (Gapgauge) to measure The degree of upward bending was analyzed.

[0089] 2-2) Post-curvature: Under the conditions of temperature 85°C and humidity 85%, after placing the test piece of the above-mentioned high-hardness multilayer sheet for 72 hours, measure the height from the corner and the bottom surface, and use the gap to measure Instrument (Gapgauge) to analyze the degree of upward bending.

[0090] Table 2

[0091]

[0092] Referring to Table 2 above, it ca...

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Abstract

The present invention provides a high hardness multi-layer sheet of polycarbonate multilayer structure comprising: a polymethyl methacrylate layer having an acrylic copolymer formed from 75 parts by weight to 88 parts by weight of (meth)acrylic acid ester monomer, 2 parts by weight to 5 parts by weight of styrene monomer, and 10 parts by weight to 20 parts by weight of N-substituted maleimide monomer; and a polycarbonate copolymer.

Description

technical field [0001] The present invention relates to a high hardness multilayer sheet. Background technique [0002] Recently, a variety of mobile devices have become popular. Currently, materials generally used for mobile devices should have excellent characteristics such as weather resistance, scratch resistance to withstand scratches from external stimuli, impact resistance to external shocks, and processability. [0003] As a raw material used in conventional mobile devices, liquid crystal windows made of polymethyl methacrylate (PMMA) resin as the main raw material have excellent weather resistance and scratch resistance, but there is a problem of weak impact resistance. Recently, with the With the popularity of ultra-thin mobile devices and the proliferation of large liquid crystal displays (LCDs), the shortcomings of existing polymethyl methacrylate resins have been highlighted. In order to produce ultra-thin mobile devices, the thickness of the mobile device wind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B7/02B32B27/18
CPCB32B27/18B32B27/08B32B27/308B32B27/365B32B2307/306B32B2307/536B32B2307/546B32B2307/584B32B2307/71B32B2307/734B32B2457/20
Inventor 朴桓石黄德律权冻铸李宗勋申昌学芮圣勋宋睿理俞多荣南海林
Owner LG HAUSYS LTD
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