Transparent coating systems for improving the environmental dura

Details Transparent coating systems for improving the environmental dura Transparent coating systems for improving the environmental dura

1997-11-06

1999-08-17

Nakarani, D. S.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428336, 4284233, 4284255, 4284256, 428429, 428432, 428433, 428434, 428448, B32B 2740

Patent

active

059391880

ABSTRACT:
Transparent substrates having at least one surface coated with a transparent coating system to improve their environmental durability are described. The transparent coating system consists of a combination of components having different properties applied as separate layers to the transparent substrate. A thin layer of a silica-based adhesion promoter is applied directly to at least one surface of the substrate, followed by an organosilane primer layer, then a low modulus polyurethane layer, and, lastly, a thermoset aliphatic polyurethane layer. Alternatively, the low modulus polyurethane may also contain silanol groups or functional groups that can be hydrolyzed to silanol, thereby making a separate primer layer unnecessary.

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