Stryrene resin composition and process for producing the same
AssigneeDainippon Ink and Chemicals, Inc.
InventorsTsuyoshi Morita, Mamoru Fujihira, Jiro Matsuo
Life of this patent
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Abstract
A styrene resin composition excellent in luster, rigidity and surface impact strength is provided. A mixed solution of (b1) a homopolymer of a diene monomer or (b2) a copolymer of a styrene monomer and a diene monomer, the copolymer having 15% or less on a weight basis of the styrene structure units, (b3) a copolymer of a styrene monomer and a diene monomer, the copolymer having 20 to 50% on a weight basis of the styrene structure units, (a1) a styrene monomer, and (a2) a (meth)acrylic acid alkyl ester is continuously bulk polymerized in a continuous bulk polymerization line having incorporated therein a tubular reactor with a plurality of mixing elements that have no mobile part fixed inside thereof.
Claims13
A styrene resin composition having a copolymer (A) of a styrene monomer and an acrylic monomer as a matrix phase, and rubber particles (B) comprising a diene rubbery polymer with which a styrene monomer and an acrylic monomer are graft coplymerized as dispersed particles,
- wherein the copolymer (A) is a copolymer of the styrene monomer and the (meth)acrylic acid alkyl ester in a proportion of the former/latter=95/5 to 50/50 on a weight basis, the rubber particles (B) have a median diameter in the range of 0.5 to 0.9 μm on a volume basis, the rubber particles (B) include both (B1) rubber particles having a salami structure and (B2) rubber particles having a core-shell structure, the rubber particles (B1) and the rubber particles (B2) as measured by observing 1,000 particles by transmission electron micrograph (magnification:
- 10,000×1) is (B1)/(B2)=70/30 to 95/5, and a value of (toluene-insoluble solids content at 25° C./toluene swelling index at 25° C.) is in the range of 1.2 to 2.5.
Dependencies are inferred from the claim text.