Back to results
US 4,085,092 AGranted
Transparent, optically clear poly(lactone-urethane) interlayers for laminated safety glass
AssigneePPG Industries, Inc.
InventorsWen-Hsuan Chang, Vernon G. Ammons
Life of this patent
Estimating the term…
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.
Claims17
A non-blooming energy-absorbing polyurethane interlayer 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;
- the equivalent ratio of (A)/(B)/(C) being within the following range:
- 1.35-4.4/1.000/0.5-3.
4 more elements
Dependencies are inferred from the claim text.