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Abrasion resistant polyurethane coatings for rigid plastics

  • US 4,731,289 A
  • Filed: 11/24/1986
  • Issued: 03/15/1988
  • Est. Priority Date: 02/14/1980
  • Status: Expired due to Term
First Claim
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1. An abrasion resistant branched polyurethane coated rigid plastic transparency comprising:

  • a. a transparent rigid plastic substrate; and

    b. an abrasion resistant transparent branched polyurethane coating at least 5 mils thick formed from the reaction of an aliphatic diisocyanate and a polyol comprising a polyester polyol, said polyurethane having a durometer value at 70°

    F. between Shore A 50 and Shore D 80 and said polyol comprising sufficient triol to produce a branched polyurethane with a molecular weight between branch points between 1000 and 13,000

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