RUBBER-MODIFIED AROMATIC VINYL-BASED RESIN COMPOSITION

摘要

Disclosed is an aromatic vinyl-based resin composition which uses natural rubber as the rubber component, has excellent impact resistance and excellent surface appearance of molded products, and has a low environmental impact. The disclosed rubber-modified aromatic vinyl-based resin composition contains at least one type of graft copolymer (A) obtained by polymerizing in the presence of a rubber polymer (a) a vinyl-based monomer (b) formed having an aromatic vinyl compound and, if desired, other monomers capable of copolymerization with said aromatic vinyl compound, wherein the rubber polymer (a) contained in said composition contains a deproteinized natural rubber (a1) with nitrogen content of no more than 0.1 mass%, and a synthetic rubber (a2). The rubber polymer (a) optimally comprises component (a1) at 3-90 mass% and component (a2) at 10-97 mass%. The composition also optionally contains a (co-)polymer (B) of vinyl-based monomers.