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Method for preparing rubber-reinforced thermoplastic resin, and rubber-reinforced thermoplastic resin composition using the same

  • US 20070123648A1
  • Filed: 03/25/2005
  • Published: 05/31/2007
  • Est. Priority Date: 08/19/2004
  • Status: Abandoned Application
First Claim
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1. A method for preparing the rubber-reinforced thermoplastic resin characterized in that it comprises on the basis of 100 weight parts of total monomer used to prepare graft copolymer, a) the stage of charging 45 to 65 weight parts of the mixture into a polymerization reactor, comprising 10 to 30 weight parts of a rubber latex having average particle diameter of 0.08 to 0.16 μ

  • m and gel content of 65 to 95 weight % and 15 to 45 weight parts of a rubber latex having average particle diameter of 0.26 to 0.34 μ

    m and gel content of 55 to 85 weight %, 5 to 15 weight parts of aromatic vinyl compound, 1 to 6 weight parts of vinyl cyanide compound, 0.3 to 0.8 weight part of emulsifier, 100 to 150 weight parts of deionized water, and 0.1 to 1.0 weight part of molecular weight control agent, raising the temperature of the polymerization reactor up to 40 to 50°

    C., starting the polymerization reaction by charging peroxide initiator and activator, and slowly raising the temperature of the polymerization reactor up to 60 to 70°

    C.;

    b) the stage, after 30 to 60 minutes since the beginning of the polymerization and when the monomer conversion of the polymerization reaction at the stage a) reaches 70 to 90%, of charging the monomer emulsion comprising 20 to 30 weight parts of aromatic vinyl compound, 5 to 10 weight parts of vinyl cyanide compound, 0.5 to 1.5 weight part of emulsifier, and 20 to 30 weight parts of deionized water, and peroxide initiator into the reactant from said stage a) for 1 to 3 hours continuously, and maintaining the temperature of the polymerization reactor at the range from 70 to 80°

    C.; and

    c) the stage, after completing the charging of the monomer emulsion and peroxide initiator at said stage b), of charging again peroxide initiator and activator at once and polymerizing it at 70 to 80°

    C. for 1 to 2 hours, wherein the monomer conversion is 99% or more, and the weight ratio of vinyl cyanide compound to aromatic vinyl compound at said stages a) and b) is from 16/84 to 24/76 , and the graft ratio of copolymer grafted on the rubber latex is from 25 to 65 parts.

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