Phosphine oxide hydroxyarl mixtures with novolac resins for co-curing epoxy resins
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United States of America Patent
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Apr 10, 2007
Grant Date -
Nov 11, 2004
app pub date -
Jun 14, 2004
filing date -
Feb 15, 2001
priority date (Note) -
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Abstract
There is disclosed a novel mixture of polyhydroxy phenolic curing agents, such as novolac resins blended with a mixture of mono, bis and tris hydroxyaryl phosphine oxides for co-curing epoxy resins and imparting flame resistance thereto. A preferred composition includes a mixture of monohydroxyaryl, bishydroxyaryl and trishydroxyaryl phosphine oxide and a benzoguanamine/phenol/formaldehyde terpolymer which is used along with an epoxy resin to produce flame-resistant printed wiring boards without the use of halogens.
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