POLYUREA POLYMERS HAVING IMPROVED HIGH TEMPERATURE STABILITY AND METHOD OF MAKING SAME

摘要

Polyurea polymers prepared from formulations including a polyisocyanate, a polyamine and a polyepoxide can have good heat stability and good physical properties. The polymers can be prepared in one step of admixing and heating at greater than 150 DEG C or in a two step process by first admixing the components at less than 130 DEG C and then postcuring the product at greater than 150 DEG 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.