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A vinyl chloride resin composition to be used for extrusion molding whereby the cross-sectional shape of a molded product is continuously changed, said composition comprising 100 parts by weight of a vinyl chloride homopolymer, from 20 to 200 parts by weight of a plasticizer, and from 5 to 30 parts by weight of an acrylic resin having a weight average molecular weight of at least 1,500,000 and having a maximum draft ratio (i.e. when the vinyl chloride resin composition is extruded from an orifice having a diameter of 1 mm and a length of 20 mm at a cylinder temperature of 170.degree. C. at a shear rate of 1.2.times.10.sup.2 s.sup.-1, and the extruded filamentous composition is taken off at an increasing speed, a ratio of the take-off speed to the extrusion speed immediately before breakage of the filamentous composition) of at least 7.

Titel:	Vinyl chloride resin composition
Autor/in / Beteiligte Person:	Ichikawa, Naoki
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	1997
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 5,658,980 Publication Date: August 19, 1997 Appl. No: 08/550,230 Application Filed: October 30, 1995 Assignees: Mitsubishi Chemical MKV Company (Tokyo, JPX) Claim: What is claimed is Claim: 1. A vinyl chloride resin composition to be used for extrusion molding whereby the cross-sectional shape of a molded product is continuously changed, said composition comprising 100 parts by weight of a vinyl chloride homopolymer, from 20 to 200 parts by weight of a plasticizer, and from 5 to 30 parts by weight of an acrylic resin having a weight average molecular weight of at least 1,500,000, said acrylic resin comprising 60-90 wt % methyl methacrylate and 40-10 wt % of alkyl acrylate or a mixture of alkyl acrylate with a comonomer selected from the group consisting of acrylic acid, acrylamide, acrylonitrile, methacrylic acid and a methacrylic acid ester other than methyl methacrylate, and wherein said composition has a maximum draft ratio of at least 7. Claim: 2. The vinyl chloride resin composition according to claim 1, wherein the weight average molecular weight of the acrylic resin is within a range of from 1,800,000 to 3,500,000. Claim: 3. The vinyl chloride resin composition according to claim 1, wherein the methyl methacrylate content of the acrylic resin is within a range of from 70 to 90 wt %. Claim: 4. The vinyl chloride resin composition according to claim 1, wherein the amount of the acrylic resin is within a range of from 5 to 20 parts by weight per 100 parts by weight of the vinyl chloride homopolymer. Claim: 5. The vinyl chloride resin composition according to claim 1, wherein the maximum draft ratio is within a range of from 8 to 50. Claim: 6. The vinyl chloride resin composition according to claim 1, which contains a filler. Claim: 7. The vinyl chloride resin composition according to claims 6, wherein the amount of the filler is within a range of from 5 to 150 parts by weight per 100 parts by weight of the vinyl chloride homopolymer. Current U.S. Class: 524/523; 524/569 Current International Class: C08J 300 Patent References Cited: 3954928 May 1976 Omori et al. ; 4894281 January 1990 Yagi et al. ; 5298334 March 1994 Moriyama et al. Primary Examiner: Mulcahy, Peter D. Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

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Vinyl chloride resin composition