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Transparent polymeric laminate

  • US 4,937,147 A
  • Filed: 04/10/1989
  • Issued: 06/26/1990
  • Est. Priority Date: 04/10/1989
  • Status: Expired due to Fees
First Claim
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1. A transparent polymeric laminate comprising a sheet of plasticized partial polyvinyl butyral containing about 17 to 25 weight percent hydroxyl groups chemically linked by urethane groups to a thermoset polyurethane layer formed as the reaction product of a cross-linkable mixture containing photoinitiator, cycloaliphatic diisocyanate having NCO groups chemically attached to secondary cycloaliphatic carbons and a polyether polyol containing primary or secondary hydroxyl groups having a molecular weight between about 250 to about 8000.

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