Hybrid nonisocyanate polyurethane network polymers and composite

Details Hybrid nonisocyanate polyurethane network polymers and composite Hybrid nonisocyanate polyurethane network polymers and composite

1998-06-15

2000-09-19

Dawson, Robert

Stock material or miscellaneous articles

Composite

Of polyamidoester

525423, 528106, 528121, 528407, B32B 2740

Patent

active

061209058

ABSTRACT:
This invention relates to a hybrid nonisocyanate polyurethane network polymer formed by cross-linking at least one cyclocarbonate oligomer and at least one amine oligomer. The cyclocarbonate oligomer contains a plurality of terminal cyclocarbonate groups. At least one cyclocarbonate oligomer further comprises from about 4% to about 12% by weight of terminal epoxy groups. Because at least one cyclocarbonate oligomer contains both cyclocarbonate and epoxy reactive groups, the network formed therefrom is referred to as a hybrid nonisocyanate polyurethane network. The cyclocarbonate oligomer or oligomers have an average functionality towards primary amines of from about 2.0 to about 5.44. The amine oligomer comprises at least one primary amine-terminated oligomer terminated with primary amine groups and has an average functionality towards cyclocarbonate groups of from about 3.0 to about 3.8. The amine oligomer is present in an amount from about 0.93 to about 0.99 of the amount of the amine oligomer that would be required to achieve a stoichiometric ratio between the primary amine groups of the amine oligomer and the cyclocarbonate groups of the cyclocarbonate oligomer. The hybrid nonisocyanate polyurethane network polymer formed has a gel fraction of not less than about 0.96 by weight. This invention also relates to methods of making hybrid nonisocyanate polyurethane networks and their use as a composite matrix material.

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