Precatalyzed catalyst compositions, process for preparing resins, curable compositions, articles resulting from curing the resultant compositions
AssigneeThe Dow Chemical Company
InventorsHa Q. Pham, Michael B. Cavitt, Pamela A. Hardcastle
Life of this patent
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Abstract
The reaction between epoxy compounds and active hydrogen-containing compounds or anhydrides is catalyzed with a phosphine or phosphonium compound containing at least three C.sub.1 to C.sub.4 alkyl phenyl groups attached to the phosphorous atom per molecule.
Claims10
In a process for preparing advanced resins by reacting one or more compounds having an average of more than one vicinal epoxide group per molecule with one or more compounds having an average of more than one, but not more than about two hydrogen atoms which are reactive with a vicinal epoxide group per molecule in the presence of a phosphonium or phosphine catalyst, with the proviso that (i) the composition can contain minor amounts of one or more compounds having an average or more than two hydrogen atoms which are reactive with a vicinal epoxide group per molecule which amounts are insufficient to cause gellation of the reaction mixture, and/or (ii) the composition can contain minor amounts of one or more compounds having an average of more than two vicinal epoxide groups per molecule which amounts are insufficient to cause gellation of the reaction mixture;
- wherein the improvement comprises employing as the phosphonium or phosphine catalyst, one having at least three C.sub.1 to C.sub.4 alkyl phenyl groups attached to the phosphorus atom per molecule.
In a curable composition comprising (A) at least one vicinal epoxide-containing compound;
- (B) at least one phosphonium or phosphine compound;
- and (C) a suitable curing agent for said epoxy-containing compound, which curing agent contains (1) a plurality of hydrogen atoms reactive with a vicinal epoxide group or (2) one or more acid anhydride groups or (3) a combination of hydrogen atoms reactive with a vicinal epoxide group and acid anhydride groups;
- wherein the improvement comprises in employing as the phosphonium or phosphine catalyst, one having at least three C.sub.1 to C.sub.4 alkyl phenyl groups attached to the phosphorus atom per molecule.
Dependencies are inferred from the claim text.