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US 4,398,013 AGranted
Accelerator for anhydride-cured epoxy resins
AssigneeGeneral Electric Company
InventorDonald S. Johnson
Life of this patent
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Abstract
An improved process for curing a polyepoxide composition with a polycarboxylic acid or polycarboxylic acid anhydride is described wherein the addition of a diphenyliodonium salt accelerator provides for shortened curing reaction times at lower reaction temperatures or at room temperatures if the composition is exposed to a source of ultraviolet radiation.
Claims11
A process for curing polyepoxides which comprises:
- (a) preparing an admixture comprising:
- (i) a polyepoxide having more than one epoxy group;
- and
- (ii) at least 0.5 equivalents of at least one member selected from the group consisting of polycarboxylic acid, polycarboxylic acid anhydride or mixtures thereof;
- (b) adding to said admixture from about 0.01% to about 10% by weight of said admixture of a diarylhalonium complex salt accelerator having the formula
- [(R).sub.a (R').sub.b X].sub.c.sup.+ [MQ.sub.d ].sup.-(d-e)
- where R is a monovalent organic radical, R' is a divalent aromatic organic radical X is a halogen radical such as I,Br,Cl, etc., M is a metal or metalloid and Q is a halogen radical such as Cl,F,Br,I, etc., a is a whole number equal to 0 or 2, b is a whole number equal to 0 or 1, the sum of a+b is equal to 2 or the valence of X, c+d-e, e+the valence of M and is an integer equal to 2 to 7 inclusive, and d is >e and is an integer having a value up to 8;
- (c) exposing said admixture to a means for initiating a curing reaction;
- and
- (d) allowing said curing reaction to continue until substantially complete.
7 more elements
A composition comprising the mixture of:
- (a) a polyepoxide having more than one epoxy group;
- (b) at least 0.5 equivalents of at least one member selected from the group consisting of:
- (i) a polycarboxylic acid,
- (ii) a polycarboxylic acid anhydride, and
- (iii) mixtures thereof;
- (c) from about 0.01% to about 10% by weight of said composition of a diarylhalonium complex salt accelerator having the formula
- [(R).sub.a (r').sub.b X].sub.c.sup.+[MQ.sub.d ].sup.-(e-e)
- where R is a monovalent organic radical, R' is a divalent aromatic organic radical X is a halogen radical such as I,Br,Cl, etc., M is a metal or metalloid and Q is a whole number equal to 0 or 1, the sum of a+b is equal to 2 or the valance of X, c+d-e, e+the valence of M and is an integer equal to 2 to 7 inclusive, and d is >e and is an integer having a value up to 8.
5 more elements
Dependencies are inferred from the claim text.