COPOLYMER, PROCESS FOR PRODUCING COPOLYMER, RESIN COMPOSITION, MOLDED OBJECT, AND MOTOR VEHICLE

• Main Authors: MATSUMOTO Akikazu, YAMASHITA Risa, OKADA Haruki
• Format: Patent
• Language: English; French; German
• Published: 22.08.2018
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The present invention provides a copolymer demonstrating superior heat resistance, fluidity, mechanical properties, appearance, low water absorbency and moldability. In addition, the present invention provides a process for producing a copolymer that enables the resulting copolymer to demonstrate superior heat resistance, fluidity, mechanical properties, appearance, low water absorbency and moldability. The copolymer of the present invention is a copolymer containing 80 mol% or more of a methyl (meth)acrylate unit (A), wherein the Vicat softening temperature thereof is 115°C or higher, the saturated water absorption rate thereof at 60°C is 4% by weight or less, and the yellow index thereof is 1 or less. In addition, the process for producing a copolymer of the present invention comprises the obtaining of a precursor by suspension polymerizing a monomer mixture containing 80 mol% or more of methyl (meth)acrylate (a) and 0.7 mol% to 7 mol% of (meth)acrylic acid (b), followed by melting and kneading the resulting precursor with an extruder to obtain a copolymer containing 80 mol% or more of a methyl (meth)acrylate unit (A), 0.45 mol% to 7 mol% of a (meth)acrylic acid unit (B), and 0.001 mol% to 0.25 mol% of a glutaric anhydride unit (C).