Claims
- 1. A halogen-free flame-retardant epoxy resin composition, comprising:(A) a bisphenol A epoxy resin; (B) a novolak epoxy resin; (C-1) a reactive phosphoric acid ester; (C-2) a curing agent of nitrogen-containing phenolic resin prepared by the co-condensation of a phenolic compound, a guanamine compound, and an aldehyde compound in the presence of an acid catalyst; (D) a curing accelerator; and (E) an inorganic filler.
- 2. The resin composition according to claim 1, wherein said reactive phosphoric acid ester (C-1) is represented by the formula: where a+b+c=3; a is 1, 2 or 3; b is 0, 1 or 2; c is 0, 1 or 2; n is 1 or 2; and each of R1, R2, R3, R4 and R5 is a hydrogen atom or an alkyl group, at least one of these R1 to R5 being an alkyl group.
- 3. A prepreg comprising a glass substrate impregnated with the epoxy resin composition according to claim 1.
- 4. A prepreg comprising a glass substrate impregnated with the epoxy resin composition according to claim 2.
Parent Case Info
This application is a divisional of U.S. Ser. No. 08/849,179, filed May 28, 1997, U.S. Pat. No. 5,955,184, which is a §371 of PCT/JP95/01988, filed Sept. 29, 1995.
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