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Processing aid, vinyl chloride resin composition containing the same, and process for producing molded article with the same

  • US 6,730,741 B1
  • Filed: 02/01/2002
  • Issued: 05/04/2004
  • Est. Priority Date: 05/19/1999
  • Status: Expired due to Term
First Claim
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1. A processing aid comprising:

  • a copolymer (A) whose mean weight molecular weight (Mw) measured with gel permeation chromatography is in the range of from 700,000 to 2,000,000, and molecular weight distribution (Mw/Mn) is 3.0 or smaller, which is obtained by copolymerizing a monomer mixture comprising 70 to 90% by weight of methyl methacrylate, 10 to 30% by weight of acrylate or methacrylate other than methyl methacrylate, and 3% by weight or less of a different type of monomer capable of being copolymerized with those monomers; and

    a copolymer (B) whose mean weight molecular weight (Mw) measured with gel permeation chromatography is in the range of from 10,000 to 500,000, which is obtained by copolymerizing a monomer mixture comprising at least 30 to 50% by weight of methyl methacrylate, a monomer other than a polyfunctional monomer and having as constitutional units at least one type other than methyl methacrylate, and 2% by weight or less of polyfunctional monomers, wherein copolymer (A) and copolymer (B) are present in a ratio of 100 parts by weight of copolymer (A) to 0.5-100 parts by weight of copolymer (B).

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