(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 decrease in productivity, insufficient weather resistance, poor appearance of molded products, or inability to sufficiently suppress heat-induced coloring.

Method used

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  • (meth) acrylic resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

Embodiment 2

[0113] Except having changed the quantity of n-octyl mercaptan into 0.42 mass parts, the granular (meth)acrylic-type resin composition of this invention was obtained by the method similar to Example 1. Various physical properties of this granular (meth)acrylic resin composition were evaluated by the same method as 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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