Polyhydric phenols as chain extenders for certain...

Details Polyhydric phenols as chain extenders for certain... Polyhydric phenols as chain extenders for certain...

C - Chemistry, Metallurgy

08

G

402/297

C08G 73/10 (2006.01) C08G 73/12 (2006.01)

Patent

CA 2009018

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

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