Heat resistant composition bismaleimide-modified polyurethane

Details Heat resistant composition bismaleimide-modified polyurethane Heat resistant composition bismaleimide-modified polyurethane

1993-07-09

1997-02-11

Kiliman, Leszek

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

Synthetic resins

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

525455, 525422, 525540, 525929, C08F28304

Patent

active

056022131

ABSTRACT:
A heat resistant composition comprising a mixture of (a) a polyurethane or a modified polyurethane and (b) a bismaleimide oligomer, in which the bismaleimide oligomer is in an amount of about 1 to 35 percent by weight based on overall solid contents. The polyurethane is formed by reacting a diisocyanate-containing compound with a dihydroxy diol-compound. Then the polyurethane is reacted with a trimellitic anhydride, a diacid or a mixture thereof to form the modified polyurethane. The bismaleimide oligomer is formed by reacting a bismaleimide resin with a barbituric acid or a derivative thereof.

REFERENCES:
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patent: 4937175 (1990-06-01), White et al.
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patent: 5041519 (1991-08-01), Pan et al.
patent: 5110850 (1992-05-01), Farkas
patent: 5310850 (1994-05-01), Chen et al.
Pan et al., "Effect of Barbituric Acid on the Self-Polymerization Reaction of Bismaleimides", Journal of Applied Polymer Science, vol. 45, pp. 103-109.

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