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Resin composition

A resin composition and resin technology, applied in the field of resin composition, can solve the problems of opacity and inability to be used for transparency, etc., and achieve the effect of improving heat resistance and suppressing white turbidity

Inactive Publication Date: 2017-09-26
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since methacrylic resins and aromatic polycarbonate resins are mutually incompatible resins, when the two are mixed, the resulting resin composition generally becomes opaque, and cannot be used for applications requiring transparency.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0121] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited to these examples. In the examples, parts, %, and ppm indicating the usage amount or content are based on weight unless otherwise specified. In addition, methods for measuring and evaluating various physical properties of the obtained resin composition and molded article are as follows.

[0122]

[0123] A resin composition prepared by mixing a methacrylic resin and an aromatic polycarbonate resin is dried at 90°C for 12 hours, and then pressed using a press molding machine ["SHINDO Type ASF Type Hydraulic Press" manufactured by Shindo Metal Industry Co., Ltd.] Press forming was performed at a press temperature of 220° C. to obtain a shaped sheet having a thickness of 3 mm. Then, the obtained formed pieces were press-formed again using the same press-forming machine at press temperatures of 260°C, 270°C, 280°C, and 290...

Synthetic example 1

[0132] [Synthesis example 1]: Manufacture of methacrylic resin

[0133] To the first polymerization reactor equipped with a stirrer, 99.5% of methyl methacrylate, 0.5% of methyl acrylate, 0.01 part of t-amyl peroxide 2-ethylhexanoate as a polymerization initiator, and 0.01 part of t-amyl peroxide as a chain 0.10 parts of n-octyl mercaptan as a transfer agent, 0.1 parts of stearyl alcohol as a release agent, and 2-tert-octyl alcohol in an amount equivalent to about 30 ppm of the total amount of the finally obtained methacrylic resin as a heat stabilizer Dialkyl disulfides were polymerized at 140°C with an average residence time of 60 minutes. Then, the reaction solution as a partial copolymer flowing out from the first polymerization reactor is sent to the second polymerization reactor equipped with a stirrer, and an additional injection containing 99.5 parts of methyl methacrylate and 0.5 parts of methyl acrylate as a polymerization initiator 0.01 part of 1,1-di(t-butylperoxy...

Synthetic example 2

[0134] [Synthesis example 2]: Manufacture of methacrylic resin

[0135] To the first polymerization reactor equipped with a stirrer, 99.1% of methyl methacrylate, 0.9% of methyl acrylate, 0.02 parts of t-amyl peroxide 2-ethylhexanoate as a polymerization initiator, and 0.02 parts of tert-amyl peroxide as a chain 0.13 parts of n-octyl mercaptan as a transfer agent, 0.1 parts of stearyl alcohol as a release agent, and di-tert-octyl alcohol in an amount equivalent to about 30 ppm of the total amount of the finally obtained methacrylic resin as a thermal stabilizer. Dialkyl disulfides were polymerized at 140°C with an average residence time of 37 minutes. Then, the reaction liquid as a partial copolymer flowing out from the first polymerization reactor is sent to the second polymerization reactor equipped with a stirrer, and an additional injection containing 99.1% of methyl methacrylate and 0.9% of methyl acrylate as a polymerization initiator 0.01 part of 1,1-di(tert-butylperox...

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Abstract

The present invention provides a resin composition which is a mixture of a methacrylic resin with an aromatic polycarbonate resin and which is capable of giving molded objects that are inhibited from becoming opaque and have excellent transparency. The resin composition comprises 80 parts by weight or less of an aromatic polycarbonate resin and 20 parts by weight or more of a methacrylic resin (the sum of both resins being taken as 100 parts by weight). The methacrylic resin has a weight-average molecular weight of 65,000-250,000, has a molecular-weight distribution index, which is represented by (weight-average molecular weight) / (number-average molecular weight), as large as 2.2 or greater, and contains at least 20 wt% components having molecular weights up to 40,000. The methacrylic resin, in analysis by GPC, gives a chromatogram regarding molecular-weight distribution (representative fig.) which has peak tops in positions respectively on the lower-molecular-weight side and the higher-molecular-weight side of the position having a molecular weight of 50,000, as in (A) or (B). That is, the methacrylic resin shows a so-called bimodal molecular-weight distribution.

Description

technical field [0001] The present invention relates to a resin composition containing a methacrylic resin and a polycarbonate resin. Background technique [0002] It is known that methacrylic resins are generally excellent in transparency, surface hardness, ultraviolet resistance, weather resistance, chemical properties, and the like, but are insufficient in dimensional stability, impact resistance, low-temperature resistance, and the like. On the other hand, aromatic polycarbonate resins are generally excellent in high temperature stability, dimensional stability, impact resistance, rigidity, transparency, etc., but are insufficient in scratch resistance and long-term ultraviolet resistance, and are prone to stress birefringence. [0003] In view of the characteristics of the above two resins, a resin composition containing a methacrylic resin and an aromatic polycarbonate resin can be expected to be used in various applications because one component compensates for the sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/10C08L69/00
CPCC08L33/10C08L69/00
Inventor 和气孝雄中原亮
Owner SUMITOMO CHEM CO LTD
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