Darby & Darby
Rubber-modified aromatic vinyl resin composition and process for the production thereof
 Provided is a rubber-modified aromatic vinyl resin composition, wherein (a) 4 to 20% by weight of a rubber-like polymer is contained, (b) the rubber-like polymer is dispersed in the aromatic vinyl polymer in the form of grains, and the dispersed grains have a weight-average grain diameter falling in a range of 0.4 to 0.8 .mu.m, (c) the dispersed grains have 1.0 .mu.m or less of a 5% value and 0.2 .mu.m or more of a 95% value in a cumulative grain diameter distribution on a weight basis, (d) a ratio of toluene-insoluble matters to a rubber component each of which is contained in the said composition falls in a range of 1.0 to 2.5, and (e) 0.005 to 0.5% by weight of a silicone oil or the mixed oil of the same amount of silicone oil and a fluorine compound oil of 0.0002 to 0.03% by weight is contained in the said composition. The rubber-modified aromatic vinyl resin composition described above is excellent in a balance between an impact resistance and a rigidity, and has an excellent gloss. 
Nippon Steel Chemical Co., Ltd.
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C08F C08L C08L C08K C08L C08K
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Yasuji Masanari Masayuki
Shichijo Fujita Nozawa