Metal acetylacetonate/alkylphenol curing catalyst for polycyanate esters of polyhydric phenols
AssigneeInterez, Inc.
InventorDavid A. Shimp
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Abstract
Polycyanate esters of polyhydric phenols are cured with a liquid solution of a metal acetylacetonate in an alkylphenol. Such cured compositions are useful in structural composites, transfer molded-encapsulants, filmed structural adhesives and printed wiring boards.
Claims36
A curable composition comprising a polycyanate ester of a polyhydric phenol and a catalyst comprising a liquid solution of a metal acetylacetonate in an alkylphenol wherein the metal is a coordinating metal and wherein the alkylphenol has 1 or 2 alkyl substituents ortho or para to the phenol group and wherein the alkyl groups contain a total of one to about 22 carbon atoms.
A process for preparing a cured composition which comprises mixing a polycyanate ester of a polyhydric phenol with a catalyst comprising a liquid solution of a metal acetylacetonate in an alkylphenol, wherein the metal is a coordinating metal and wherein the alkylphenol has 1 or 2 alkyl substituents ortho or para to the phenol group wherein the alkyl group contains a total of one to about 22 carbon atoms, and heating the mixture at a temperature of about 250.degree. F. to about 450.degree. F. for a time sufficient to cure the mixture.
Dependencies are inferred from the claim text.