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Process of producing transparent foamed plastics materials

  • US 4,419,459 A
  • Filed: 07/30/1981
  • Issued: 12/06/1983
  • Est. Priority Date: 01/15/1980
  • Status: Expired due to Fees
First Claim
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1. A process of producing transparent foamed plastics, comprising mixing (i) a polymerizable composition consisting essentially of methyl methacrylate and a polymerization catalyst and which does not contain a blowing agent, and (ii) at least one component selected from the group consisting of(a) solid beads comprising a mixture of at least one transparent polymethylmethacrylate and blowing agent, and(b) solid beads comprising at least one transparent polymethylmethacrylate with blowing agent containing micro-capsules enclosed therein,heating and expanding said beads and polymerizing said polymerizable composition.

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