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US 4,045,472 AGranted
Urethane polythiols
AssigneeW. R. Grace & Co.
InventorsJames Leverette Guthrie, Clifton Leroy Kehr
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Abstract
The novel urethane polythiols of this invention are prepared by reacting: (a) a mono-, di-, or trihydric polythiol with a polymeric isocyanate; or (b) a di- or trihydric polythiol with a diisocyanate.
Claims6
A urethane polythiol prepared by admixing and reacting at 0.degree.-100.degree. C:
- (a) a di- or trihydric polythiol having the formula ##STR16## in which R.sub.4 is a saturated trivalent hydrocarbon moiety having 12-24 carbon atoms and n is 1-2;
- and (b) a diisocyanate selected from the group consisting of ##STR17## , and OCN--CH.sub.2 (CH.sub.2).sub.4 CH.sub.2 --NCO, the diisocyanate and the di- or trihydric polythiol being admixed in amounts to provide 1 equivalent of --NCO per 0.5-2 equivalent of --OH.
A urethane polythiol prepared by admixing and reacting at 0.degree.-100.degree. C:
- (a) a di- or trihydric polythiol having the formula ##STR19## in which R.sub.4 is a saturated trivalent hydrocarbon moiety having 12-24 carbon atoms and n is 1-2;
- and (b) an isocyanate consisting essentially of methylene diphenyl diisocyanate, the isocyanate and the mono-, di-, or trihydric polythiol being admixed in amounts to provide 1 equivalent of --NCO per 0.5-2 equivalent of --OH.
Dependencies are inferred from the claim text.