Transparent, optically clear poly(lactone-urethane) interlayers for laminated safety glass
AssigneePPG Industries, Inc.
InventorsWen-Hsuan Chang, Vernon G. Ammons
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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.
Claims2
A poly(lactone-ester) polyol having a hydroxyl number within the range of 62 to 140 inclusive formed from ring opening a lactone having 6 to 8 carbon atoms with a hydroxy-terminated polyester having a hydroxyl number below 600 formed from an aliphatic polycarboxylic acid containing from 3 to 10 carbon atoms and a polyol selected from the class consisting of aliphatic diols free of alkyl substitution, cycloaliphatic diols and aliphatic triols containing from 2 to 10 carbon atoms and oxyalkylated products of these polyols.
Dependencies are inferred from the claim text.