Elastomers based on 4,4'-diisocyanato dicyclohexylmethane enriched in the trans, trans isomer which contain essentially no chain extenders
AssigneeMiles Inc.
InventorStephen D. Seneker
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Abstract
Disclosed herein is an improved elastomer comprising a reaction product of a polyisocyanate and an active hydrogen containing material, the improvement wherein the elastomer is essentially free of a chain extender, wherein the polyisocyanate comprises 4,4'-diisocyanato dicyclohexylmethane containing from about 45 to 100 percent of the trans,trans isomer.
Claims5
An improved elastomer comprising a reaction product of a polyisocyanate and an active hydrogen containing material, the improvement wherein the elastomer is essentially free of a chain extender, and the polyisocyanate comprises 4,4'-diisocyanato dicyclohexylmethane containing from 45 to 100 percent by weight of the trans,trans isomer.
In an improved process for preparing an elastomer comprising reacting a polyisocyanate with an active hydrogen containing material, the improvement wherein the active hydrogen is essentially free of a chain extender and wherein the polyisocyanate comprises 4,4'-diisocyanato dicyclohexylmethane containing the trans,trans isomer in an amount of about 45 to 100 percent by weight.
A poly(urethane-urea) consisting essentially of:
- (A) 1.0 mole of an active hydrogen containing material with terminal primary and/or secondary hydroxyl groups having a molecular weight of about 600-5000 and a functionality of 2 to 6,
- (B) a polyisocyanate containing from 45 to 100 weight percent of the trans,trans-4,4'-diisocyanato dicyclohexylmethane isomer, in an amount which is substantially equivalent to the mole of (A);
- and
- (C) Optionally, a urethane forming catalyst.
Dependencies are inferred from the claim text.