Polyurea polymers having improved high temperature stability and

Details Polyurea polymers having improved high temperature stability and Polyurea polymers having improved high temperature stability and

1995-04-13

1996-06-11

Johnson, Rachel

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

521156, 525452, 525458, 525528, 528 68, 528 73, 528481, 528503, C08G 1883

Patent

active

055256813

ABSTRACT:
Polyurea polymers prepared from formulations including a polyisocyanate, a polyamine and a polyepoxide can have good heat stability and good physical properties in the substantial absence of uretidine diones and isocyanurates. The polymers can be prepared in one step of admixing and heating at greater than 150.degree. C. or in a two step process by first admixing the components at less than 130.degree. C. and then postcuring the product at greater than 150.degree. C. The polyurea polymer, after postcuring, can have substantially no residual epoxy or oxazolidinone groups. These polymers were particularly useful for applications which require the exposure of the polyurea polymers to both intermittent high temperatures and high humidity. The polyurea polymers of the present invention can withstand higher temperatures than conventional polyurea polymers without blistering.

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