Bisphenol A and novolak epoxy resins with nitrogen-containing phenolic resin
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Apr 29, 1999
filing date -
Sep 29, 1995
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Abstract
Disclosed in a halogen-free flame-retardant epoxy resin composition, comprising (A) a bisphenol A type epoxy resin, (B) a novolak type epoxy resin, (C) a phenolic resin type curing agent, (D) a curing accelerator, and (E) an inorganic filler. The phenolic resin type curing agent (C) is provided by a nitrogen-containing phenolic resin, preferably, by a co-condensation resin formed by the reaction among a phenolic compound, a guanamine compound, and an aldehyde compound. More desirably, a phenolic resin containing both phosphorus and nitrogen should be used as the curing agent (C). Further, a combination of the co-condensation resin noted above (C-1) and a reactive phosphoric acid ester can be used as a curing agent.
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