Polyurethane coated safety glass
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United States of America
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Aug 12, 1986
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N/A
app pub date -
Jan 30, 1985
filing date -
Nov 16, 1973
priority date (Note) -
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Abstract
A scratch-resistant polyurethane coating for safety windows is made by curing a sheet of a liquid composition comprising (1) a polyglycol ether resulting from the condensation of propylene oxide with trimethylolpropane and containing 10.5%-12.0% free hydroxyls and (2) a biuret of 1,6-hexamethylene-diisocyanate, having 21-22% isocyanate groups, the weight ratio of said biuret to said polyglycol ether being about 0.9-1.1.
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