摘要 |
PROBLEM TO BE SOLVED: To obtain a composition provided together with high incombustibility, excellent moisture-resistant reliability and fuidity compounding a phenol resin, an inorganic filler and an organic phosphorous compound with an epoxy resin. SOLUTION: Organic phosphorous compounds represented by Formula I are used. Of them, compounds of Formula II are preferable, especially a compound of Formula III is preferable. In the Formulas, each X and Y is H, acyl, alkyl or cycloalkyl; each (m) and (n) is 1-4; R is a monovalent organic group having a phenolic hydroxyl group; R1 to R3 are each H, alkyl, cycloalkyl, aryl or aralkyl. The compounding amount of the organic phosphorous compound is preferably 0.5-20 wt.% of the total composition. It is preferable that an epoxy resin, a phenolic resin and the organic phosphorous compound are compounded so as to be 0.7-1.5 equivalents of the total hydroxyl groups of the phenolic resin and the organic phosphorous compound to one equivalent of the epoxy group in the epoxy resin. The compounding amount of an inorganic filler is 50-95 wt.% of the total composition.
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