| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rubber-modified thermoplastic resin with excellent impact resistance, weatherability, appearance after molded, chemical resistance, scratch resistance and slidability, by graft copolymerization of specified amount of vinyl monomer component(s) in the presence of a specific ethylene-α-olefin rubber and a hydrogenated conjugated diene-based rubbery polymer. SOLUTION: This rubber-modified thermoplastic resin with a graft percentage of 10-100% and the intrinsic viscosity [η] of methyl ethyl ketone solubles of 0.2-0.8 dL/g, is obtained by graft polymerization of monomer component (s) selected from the group consisting of aromatic vinyl compounds, vinyl cyanide compounds and other vinyl monomers copolymerizable therewith in the presence of (A) a rubbery polymer >=70 deg.C in melting point Tm composed of ethylene, a 3-20Cα-olefin and a non-conjugated diene in the weight ratio of (5-95):(95-5):(0-30) and (B) a 2nd rubbery polymer <70 deg.C in melting point Tm or with no Tm, and (C) a hydrogenated conjugated diene-based rubbery polymer in the weight ratio A/B/C of (10-60):(0-30):(90-10).
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