Laminated articles prepared from transparent, non-blooming poly(lactone-urethane) interlayers
First Claim
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1. An energy-absorbing laminate comprising at least one rigid transparent sheet laminated to a flexible non-blooming layer of a polyurethane comprising the polymerizate of:
- (A) an organic polyisocyanate,(B) a polylactone polyol having a hydroxyl number within the range of 62 to 140 inclusive formed from polymerizing an unsubstituted lactone having 6 to 8 carbon atoms with an organic polyhydroxyl-containing compound selected from the class consisting of;
(1) aliphatic diols free of alkyl substitution and oxyalkylated products of these diols,(2) a hydroxyl-terminated polyester having a hydroxyl number below 600 formed from an organic polycarboxylic acid containing from 3 to 10 carbon atoms and aliphatic diols free of alkyl substitution and oxyalkylated products of these diols,(C) a compound containing at least two active hydrogens per molecule reactive with the isocyanate group having a molecular weight less than 250 selected from the class consisting of aliphatic diols free of alkyl substitution, aliphatic triols and mixtures thereof.
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Abstract
Energy-absorbing interlayers and glass laminates prepared therefrom for use as automobile windshields and other safety glass applications are disclosed. The interlayers are made from a poly(lactone-urethane) in which the molecular weight and structure of the lactone moiety is carefully controlled so as to get optimum energy-absorbing and optical properties.
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9 Claims
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1. An energy-absorbing laminate comprising at least one rigid transparent sheet laminated to a flexible non-blooming layer of a polyurethane comprising the polymerizate of:
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(A) an organic polyisocyanate, (B) a polylactone polyol having a hydroxyl number within the range of 62 to 140 inclusive formed from polymerizing an unsubstituted lactone having 6 to 8 carbon atoms with an organic polyhydroxyl-containing compound selected from the class consisting of; (1) aliphatic diols free of alkyl substitution and oxyalkylated products of these diols, (2) a hydroxyl-terminated polyester having a hydroxyl number below 600 formed from an organic polycarboxylic acid containing from 3 to 10 carbon atoms and aliphatic diols free of alkyl substitution and oxyalkylated products of these diols, (C) a compound containing at least two active hydrogens per molecule reactive with the isocyanate group having a molecular weight less than 250 selected from the class consisting of aliphatic diols free of alkyl substitution, aliphatic triols and mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification