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Anionic copolymerization of 2-pyrrolidone with caprolactam or piperidone

  • US 4,101,531 A
  • Filed: 04/25/1977
  • Issued: 07/18/1978
  • Est. Priority Date: 05/19/1976
  • Status: Expired due to Term
First Claim
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1. A process for the production of a solid copolymer of 2-pyrrolidone and a lactam having five or six carbon atoms in its ring, which comprises polymerizing a mixture of 2-pyrrolidone and said lactam by contacting the mixture with a catalyst system consisting essentially of an alkaline polymerization catalyst, and an auxiliary catalyst which is a quaternary Group VA onium salt, carbon dioxide and a copolymerization promoter.

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