Abrasion resistant polyurethane coatings for rigid plastics
First Claim
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1. An abrasion resistant branched polyurethane coated rigid plastic transparency comprising:
- a. a transparent rigid plastic substrate; and
b. an abrasion resistant transparent branched polyurethane coating at least 5 mils thick formed from the reaction of an aliphatic diisocyanate and a polyol comprising a polyester polyol, said polyurethane having a durometer value at 70°
F. between Shore A 50 and Shore D 80 and said polyol comprising sufficient triol to produce a branched polyurethane with a molecular weight between branch points between 1000 and 13,000
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Abstract
A method is disclosed for casting a colorless, single phase liquid reaction mixture comprising an aliphatic diisocyanate and a polyester polyol against a rigid transparent plastic and curing at a sufficiently rapid rate at temperatures of about 175° to 275° F. (about 79° to 135° C.) to form a relatively soft, resilient, abrasion resistant branched polyurethane coating without warpage or deterioration of the rigid plastic. The polyesterurethane coatings disclosed are characterized by durometer values at 70° F. between Shore A 50 and Shore D 80, and molecular weights between branch points between 1000 and 13,000.
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Citations
9 Claims
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1. An abrasion resistant branched polyurethane coated rigid plastic transparency comprising:
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a. a transparent rigid plastic substrate; and b. an abrasion resistant transparent branched polyurethane coating at least 5 mils thick formed from the reaction of an aliphatic diisocyanate and a polyol comprising a polyester polyol, said polyurethane having a durometer value at 70°
F. between Shore A 50 and Shore D 80 and said polyol comprising sufficient triol to produce a branched polyurethane with a molecular weight between branch points between 1000 and 13,000 - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification