Impact-resistant glass-polyesterurethane laminates
First Claim
1. An optically clear laminate, comprising a sheet of relatively rigid, transparent material bonded to a sheet of thermoplastic, transparent polyesterurethane consisting essentially of the reaction product of (a) hydroxy-terminated polyester composition that is the esterification reaction product of an aliphatic dicarboxylic acid containing from 4 to 10 carbon atoms and an aliphatic diol containing from 4 to 8 carbon atoms, said polyester composition having a number average molecular weight of between about 500 and about 800 and containing no more than about 7 percent by weight residual, unreacted aliphatic diol, and (b) dinuclear cycloaliphatic diisocyanate, the mole ratio of diisocyanate to polyester being such that said polyesterurethane is substantially free of unreacted isocyanate groups.
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Abstract
Laminated articles of at least one sheet of relatively rigid, transparent material, e.g., glass, and polyesterurethane sheet are described. Such laminates, e.g., a bilayer assembly of one glass sheet with an adhered sheet of polyesterurethane or a trilayer assembly of two glass sheets with an interlayer of polyesterurethane sheet, are useful in safety glass applications, e.g., automobile windshields, and automobile side and rear windows. The polyesterurethane is preferably the reaction product of a cycloaliphatic diisocyanate and a relatively low molecular weight hydroxy-terminated aliphatic polyester, e.g., the esterification product of an aliphatic dibasic acid and an aliphatic diol.
55 Citations
21 Claims
- 1. An optically clear laminate, comprising a sheet of relatively rigid, transparent material bonded to a sheet of thermoplastic, transparent polyesterurethane consisting essentially of the reaction product of (a) hydroxy-terminated polyester composition that is the esterification reaction product of an aliphatic dicarboxylic acid containing from 4 to 10 carbon atoms and an aliphatic diol containing from 4 to 8 carbon atoms, said polyester composition having a number average molecular weight of between about 500 and about 800 and containing no more than about 7 percent by weight residual, unreacted aliphatic diol, and (b) dinuclear cycloaliphatic diisocyanate, the mole ratio of diisocyanate to polyester being such that said polyesterurethane is substantially free of unreacted isocyanate groups.
- 14. An optically clear glass laminate, comprising a glass sheet bonded to a sheet of thermoplastic, transparent polyesterurethane consisting essentially of the reaction product of (a) hydroxy-terminated polyester composition that is the esterification reaction product of an aliphatic dicarboxylic acid containing from 4 to 10 carbon atoms and an aliphatic diol containing from 4 to 8 carbon atoms, said polyester composition having a number average molecular weight of from about 500 to about 650 and containing no more than 6 percent by weight of residual, unreacted aliphatic diol, and (b) dinuclear cycloaliphatic diisocyanate, the mole ratio of diisocyanate to polyester being such that the polyesterurethane is substantially free of unreacted diisocyanate groups.
Specification