(meth) acrylic resin composition

A technology of methyl methacrylate and acrylic acid, applied in the direction of coating, etc., can solve the problems of poor appearance, insufficient weather resistance, and inability to fully suppress thermal coloration of molded products, and achieve the effect of good appearance and excellent injection moldability.

Active Publication Date: 2015-01-07
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the solutions proposed in the above-mentioned prior art documents are not sufficiently satisfactory due to problems such as a decrea

Method used

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  • (meth) acrylic resin composition

Examples

Experimental program
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Effect test

Example Embodiment

[0108] Example 1

[0109] 92 parts by mass of purified methyl methacrylate and 8 parts by mass of methyl acrylate were added to an autoclave with a stirrer and a sampling tube to prepare a monomer mixture. The yellow index of the monomer mixture was 0.9. Add polymerization initiator (2,2'-azobis(2-methylpropionitrile (AIBN), dehydrogenation capacity: 1%, 1-hour half-life temperature: 83°C) 0.007 parts by mass and chain transfer into the monomer mixture 0.45 parts by mass of n-octyl mercaptan agent (n-octyl mercaptan) was dissolved to obtain a raw material liquid. Nitrogen gas was used to remove oxygen in the manufacturing device.

[0110] A certain amount of the raw material liquid is discharged from the autoclave, and is supplied at a certain flow rate to a continuous flow-through tank reactor controlled at a temperature of 140°C so that the average residence time is 120 minutes, and bulk polymerization is performed. The reaction liquid was separated and collected from the sampl...

Example Embodiment

[0112] Example 2

[0113] Except having changed the amount of n-octyl mercaptan to 0.42 parts by mass, the same method as in Example 1 was used to obtain the (meth)acrylic resin composition of the present invention in a particulate form. Various physical properties of this particulate (meth)acrylic resin composition were evaluated by the same method as in Example 1. These results are shown in Table 1.

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Abstract

A (meth) acrylic resin composition containing at least 99.5% by mass (meth) acrylic resin including 80%-100% by mass of a structural unit derived from methyl methacrylate and 0%-20% by mass of a structural unit derived from acrylic ester; having a difference of no more than 3 between a yellow index (YI4) at an optical path length of 200 mm in an injection-molded article obtained at a cylinder temperature of 280°C and a molding cycle of 4 minutes, and a yellow index (YI1) at an optical path length of 200 mm in an injection-molded article obtained at a cylinder temperature of 280°C and a molding cycle of one minute; and having a melt flow rate of at least 25g/10 mins. under conditions of 230°C and a 3.8 kg load.

Description

technical field [0001] The present invention relates to a (meth)acrylic resin composition. More specifically, the present invention relates to a thin-walled and large-area molded article that can obtain a thin-walled and large-area molded product with little residual strain and almost no coloring at high productivity even when injection molding is performed at a low cylinder temperature and a high pressure. base) acrylic resin composition. Background technique [0002] The light guide plate which is a member of a liquid crystal display device is manufactured by injection-molding the resin composition containing transparent resin, such as a (meth)acrylic resin, for example (refer patent document 1). In recent years, there has been a high demand for light-weight and large-area liquid crystal display devices, and accordingly light guide plates have been required to be thinner and larger. [0003] In general, high injection pressure and high cylinder temperature are required f...

Claims

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Application Information

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IPC IPC(8): C08L33/12B29C45/00C08F220/18C08J5/00B29K33/04
CPCC08L33/12B29C45/0001C08F220/18C08F2/02C08F220/14C08J5/00C08J2333/12C08L33/04
Inventor 新村卓郎小西启之小泽宙栗田日出美田村英孝
Owner KURARAY CO LTD
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