To improve flow mark, air mark, secondary processability, etc., to a level fully satisfiable at the same time in the calendering process of a vinylchloride-based resin.
This vinylchloride-based resin composition comprises (I) 100 pts.wt. of a vinylchloride-based resin and (II) 0.1 to 10 pts.wt. of a processability improving agent for the vinylchloride-based resin, wherein the processability improving agent for the vinylchloride-based resin is a methacrylic copolymer obtained by polymerizing monomers comprising 40 to 80 wt.% of methyl methacrylate, 20 to 60 wt.% of a methacrylate other than methyl methacrylate, and 0 to 5 wt.% of a monomer copolymerizable with the methyl methacrylate and the methacrylate, the methacrylate is expressed by CH2=C(CH3)COOR where the R is a 2-8C hydrocarbon group, and the copolymer being the processability improving agent has 500,000 to 1,500,000 weight-average molecular weight (Mw) obtained by the gel permeation chromatography(GPC) and 1.6 or less molecular weight distribution (Mw/Mn) expressed by the ratio of the Mw to the number-average molecular weight (Mn).
TSUJI RYOTARO
HIIRO TOMOKI
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