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Methods for making polyurethanes as thin films

  • US 6,506,461 B2
  • Filed: 03/31/1999
  • Issued: 01/14/2003
  • Est. Priority Date: 03/31/1999
  • Status: Expired due to Term
First Claim
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1. A method of making a thin film of a polyurethane comprising:

  • (a) flash evaporating a solventless monomer mixture that is a combination of a polyol and a polyisocyanate by contact with a heated surface under vacuum to form a vapor;

    (b) condensing said monomer mixture onto a substrate under vacuum in a vacuum chamber; and

    (c) curing said monomer mixture as said film of said polyurethane.

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