Polyhydric phenol chain extenders for certain bismaleimide resin

Details Polyhydric phenol chain extenders for certain bismaleimide resin Polyhydric phenol chain extenders for certain bismaleimide resin

1990-07-25

1992-04-07

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

526212, 526262, 528125, 528159, 528164, 528317, 528321, 528322, C08G 7312

Patent

active

051029723

ABSTRACT:
A class of di-ortho-substituted bismaleimides undergo uncatalyzed Michael addition with polyhydric phenols to afford chain-extended bismaleimides having a significantly wider processing window than the non-extended parent. The fully cured resins show improved fracture toughness, generally have comparable or superior dielectric constant and dielectric loss, and show no degradation in other properties such as resistance to moisture, to methylene chloride, and coefficient of thermal expansion.

REFERENCES:
patent: 4464520 (1984-08-01), Adams et al.
Rakoutz et al. "Siloxane Modification of Bismaleimide Resins" Polymer Journal, vol. 19, No. 1, pp. 173-184 (1987).
Stenzenberger et al. "Toughened Bismaleimides: Concepts, Achievements, Directions", 19th Int'l SAMPE Tech. Conf. Oct. 13-15, 1987.
Renner, "The Reaction of Phenols with N-substituted Maleimides" Chemical Abstracts, vol. 89, 1978.

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