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US 6,887,950 B2Granted
Phosphine oxide hydroxyaryl mixtures with novolac resins for co-curing epoxy resins
AssigneePABU Services, Inc.
InventorsLarry D. Timberlake, Mark V. Hanson, E. Bradley Edwards
Life of this patent
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Abstract
A mixture of hydroxyarylphosphine oxides comprising (a) a mono(hydroxyaryl)phosphine oxide, (b) a bis(hydroxyaryl)phosphine oxide, (c) a tris((hydroxyaryl)phosphine oxide, and, optionally (d) a tri- aryl, alkyl, or aralkyl-substituted phosphine oxide combined with a phenolic co-crosslinking composition is useful as a polyhtdroxy mixture for co-crosslinking an epoxy resin which also imparts flame resistance.
Claims18
A flame-retardant curable epoxy composition comprising:
- (a) an epoxy resin;
- (b) a co-crosslinking polyhydroxy mixture including:
- (i) a mixture of phosphine oxides including hydroxyaryl phosphine oxides of the formulae:
- (A) a mono(hydroxyaryl)phosphine oxide of the formula:
- wherein R1 is a divalent, substituted or unsubstituted arylene moiety and R2 is a monovalent, substituted or unsubstituted aryl moiety or is an alkyl moiety or is an aralkyl moiety;
- and
- (B) a bis(hydroxyaryl)phosphine oxide of the formula:
- wherein R1 and R2 are defined as above;
- and
- (C) a tris(hydroxyaryl)phosphine oxide of the formula:
- wherein R1 is defined as above;
- and
- (D) optionally containing minor amounts of a pentavalent phosphine oxide of the formula:
- wherein R2 is defined as above;
- and
- (ii) a phenolic co-crosslinking composition comprising a phenolic component having a hydroxyfunctionality of two or more.
13 more elements
Dependencies are inferred from the claim text.