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US 4,103,070 AGranted
Safety glass laminates with aliphatic/cycloaliphatic polycarbonate urethanes
AssigneePPG Industries, Inc.
InventorVernon G. Ammons
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Abstract
Energy-absorbing laminates for use as automobile windshields or other safety glass applications comprising a polycarbonate urethane and a sheet of glass are disclosed. The polyurethane is formed from a cycloaliphatic diisocyanate, a compound containing at least two active hydrogens per molecule and having a molecular weight below 250, and a special polycarbonate diol synthesized from a mixture of linear aliphatic and cycloaliphatic diols.
Claims3
A safety glass laminate comprising:
- a. a ply of glass;
- and
- b. bonded to said ply of glass a ply of transparent, energy absorbing polyurethane which is the reaction product of:
- (1) an organic diisocyanate:
- (2) an organic compound having two isocyanate-reactive hydrogens and a molecular weight less than about 250;
- and
- (3) a polycarbonate diol prepared from a mixture of linear aliphatic and cycloaliphatic diols wherein the aliphatic diol has at least 4 carbon atoms comprising (a) at least 30 mole percent linear aliphatic diol and (b) at least 10 mole percent cycloaliphatic diol.
4 more elements
Dependencies are inferred from the claim text.