Composition of epoxy resin, OH-terminated phosphonate oligomer and inorganic filler
An epoxy resin composition is disclosed that comprises an epoxy resin, a reactive phosphonate curing agent, an inorganic filler, whose presence allows for reduced amounts of phosphonate as compared to a composition not containing the filler, an optional polybenzoxazine resin, and an optional co-curing agent.
1. An epoxy resin composition comprising an epoxy resin; a reactive hydroxy-terminated oligomeric phosphonate curing agent comprising the repeating unit OP(═O)(R)—O-Arylene- wherein R is lower alkyl; an inorganic filler; an optional polybenzoxazine resin; and an optional co-curing agent.
2. A composition as claimed in claim 1 wherein the epoxy resin comprises from about 10% to about 50%, by weight of the total weight of the composition.
3. A composition as claimed in claim 1 wherein the reactive hydroxy-terminated oligomeric phosphonate curing agent comprises from about 5% to about 30% by weight, of the total weight of the composition.
4. A composition as claimed in claim 1 wherein the polybenzoxazine resin comprises up to about 50%, by weight of the total weight of the composition.
5. A composition as claimed in claim 1 wherein the co-curing agent comprises from about 5% to about 20%, by weight of the total weight of the composition.
6. A composition as claimed in claim 1 wherein the inorganic filler comprises from about 10% to about 50%, by weight, of the total weight of the composition.
7. A composition as claimed in claim 1 wherein the epoxy resin comprises from about 10% to about 50%, by weight of the total weight of the composition, the reactive hydroxy-terminated oligomeric phosphonate curing agent comprises from about 5% to about 30%, by weight, of the total weight of the composition, the inorganic filler comprises from about 10% to about 50%, by weight of the total weight of the composition, and the benzoxazine resin comprises up to about 50%, by weight of the total weight of the composition.
8. A composition as claimed in claim 7 further comprising a co-curing agent at from about 5% to about 20%, by weight of the total weight of the composition.
9. A composition as claimed in claim 1 wherein the co-curing agent is selected from the group consisting of novolac, melamine-novolac, and phosphor-novolac compositions.
10. A composition as claimed in claim 2 wherein the co-curing agent is selected from the group consisting of novolac, melamine-novolac, and phosphor-novolac compositions.
11. A composition as claimed in claim 3 wherein the co-curing agent is selected from the group consisting of novolac, melamine-novolac, and phosphor-novolac compositions.
12. A composition as claimed in claim 4 wherein the co-curing agent is selected from the group consisting of novolac, melamine-novolac, and phosphor-novolac compositions.
13. A composition as claimed in claim 5 wherein the co-curing agent is selected from the group consisting of novolac, melamine-novolac, and phosphor-novolac compositions.
14. A composition as claimed in claim 6 wherein the co-curing agent is selected from the group consisting of novolac, melamine-novolac, and phosphor-novolac compositions.
15. A composition as claimed in claim 8 wherein the co-curing agent is selected from the group consisting of novolac, melamine-novolac, and phosphor-novolac compositions.
16. A composition as claimed in claim 1 wherein R is methyl.
17. A composition as claimed in claim 1 wherein Arylene is 1,3-phenylene.
18. A composition as claimed in claim 1 wherein the epoxy resin composition contains a polybenzoxazine resin.