Shin-etsu Chemical Co., Ltd.

Shoichi Yoshizawa

Osamu Matsumoto

A vinyl chloride based resin composition including (a) 100 parts by weight of at least one member of resin selected from; a vinyl chloride polymer or vinyl chloride based copolymer whose mean degree of polymerization is 500 to 1000; and a vinyl chloride based copolymer, of which an insoluble part in tetrahydrofuran is 1 to 50 parts by weight, a swelling value in tetrahydrofuran is at least 5.0 and a mean degree of polymerization of a soluble part in tetrahydrofuran is 500 to 1500, which is a copolymer of vinyl chloride monomers and monomers having at least 2 ethylenic double bonds in a molecule. The resin composition also includes (b) 1 to 30 parts by weight of a paste resin of a vinyl chloride polymer or vinyl chloride copolymer whose mean grain size is 2 .mu.m or less and mean degree of polymerization is 500 to 2000. The resin composition further includes (c) 30 to 200 parts by weight of a plasticizer and (d) 0.1 to 30 parts by weight of a water-containing silicic acid or silicic anhydride whose mean grain size is 5 .mu.m or less and has excellent powder fluidity characteristics (workability), when repeatedly heated. The moldings obtained by power slush molding of this resin compound are remarkably improved in their dull finishing characteristics and resistance to heat distortion.

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Ibaragi, Japan

Shoichi Yoshizawa