Methacrylic resin composition and shaped product
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsChihiro Hiramoto, Fumiki Murakami
Life of this patent
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Abstract
A methacrylic resin composition comprises a methacrylic resin, the methacrylic resin comprising: 50 mass % to 97 mass % of a methacrylic acid ester monomer unit (A); 3 mass % to 30 mass % of a structural unit (B) having a cyclic structure-containing main chain; and 0 mass % to 20 mass % of another vinyl monomer unit (C) that is copolymerizable with a methacrylic acid ester monomer, wherein the methacrylic resin satisfies a specific condition; and the composition has a weight average molecular weight residual ratio of 80% or more upon heating under a nitrogen atmosphere at 280° C. for 1 hour, and has a weight average molecular weight residual ratio of 80% or more upon heating in air at 280° C. for 0.5 hours.
Claims18
A methacrylic resin composition comprising a methacrylic resin, the methacrylic resin comprising:
- 50 mass % to 97 mass % of a methacrylic acid ester monomer unit (A);
- 3 mass % to 30 mass % of a structural unit (B) having a cyclic structure-containing main chain;
- and
- 0 mass % to 20 mass % of another vinyl monomer unit (C) that is copolymerizable with a methacrylic acid ester monomer, wherein
- the methacrylic resin satisfies conditions (1)-(3), indicated below:
- (1) the methacrylic resin has a weight average molecular weight of 65,000 to 300,000 as measured by gel permeation chromatography (GPC);
- (2) a content of components of the methacrylic resin having a weight average molecular weight of more than 10,000 and not more than 50,000 is 10.0 mass % to 25.0 mass %;
- (3) a content of components of the methacrylic resin having a weight average molecular weight of 10,000 or less is 0.1 mass % to 5.0 mass %;
- and
- the methacrylic resin composition has a weight average molecular weight residual ratio of 80% or more upon heating under a nitrogen atmosphere at 280° C. for 1 hour, and has a weight average molecular weight residual ratio of 80% or more upon heating in air at 280° C. for 0.5 hours.
Dependencies are inferred from the claim text.