High heat distortion temperature transparent polyurethanes

Details High heat distortion temperature transparent polyurethanes High heat distortion temperature transparent polyurethanes

1988-02-29

1989-02-28

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 65, 528 66, C08G 1810

Patent

active

048086908

ABSTRACT:
A transparent polyurethane has exceptionally high heat distortion temperatures, that is at least 280.degree. F. at 264 psi, as well as good light transmission, ultraviolet light resistance, abrasion resistance, and the like. The urethane intermediate is one or more very low equivalent weight, multifunctional hydroxy containing compounds so that when reacted with a polyisocyanate and cured with a low equivalent weight, multifunctional polyol, a highly crosslinked polyurethane is produced.

REFERENCES:
patent: 2929800 (1960-03-01), Hill
patent: 3192186 (1965-06-01), Muller et al.
patent: 4376834 (1983-03-01), Goldwasser et al.
patent: 4476292 (1984-10-01), Ham et al.

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