Method for preparing monovinyl aromatic monomer-acrylonitrile copolymer

  • US 4,068,064 A
  • Filed: 06/04/1976
  • Issued: 01/10/1978
  • Est. Priority Date: 12/22/1975
  • Status: Expired due to Term
First Claim
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1. A method for the preparation of a monovinyl aromatic monomer-acrylonitrile copolymer, steps of the method comprising providing a polymerizable stream, the stream comprising from 5 to 75 parts by weight of acrylonitrile and from 95 to 25 parts by weight of a monovinyl aromatic monomer, the stream containing from about 5 ×

  • 10-5 to 1 ×

    10-2 parts by weight per part by weight of the polymerizable stream of a free radical initiating catalyst, the catalyst having a half-life of about 1 hour at a temperature in the range of 80°

    C to 180°

    C, maintaining the stream at a polymerization temperature in excess of 80°

    C sufficient to cause at least from 20 to 200 percent conversion of the monomer to polymer per hour wherein the copolymer contains not more than 7.5 ×

    10-5 parts by weight per part of copolymer of free acrylonitrile and not more than 7 ×

    10-3 parts by weight, per part of copolymer, of co-oligomers of stryene and acrylonitrile.

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