PURPOSE: To obtain an epoxy resin compsn. which is excellent in heat resistance, moisture resistance, mechanical strengths, and oxidation resistance and improved in electrical reliability by compounding a polyepoxy resin with a specific phenol- aralkyl resin.
CONSTITUTION: A polyepoxy resin is compounded with a phenol-aralkyl resin in a molar ratio of active hydrogen atoms of the latter resin to epoxy groups of the former resin of 0.75-1.2. The phenol-aralkyl resin is obtd. by reacting 1.3-15mol of a phenol compd. of the formula (wherein R1 and R2 are each H, 1-9C alkyl, 1-4C alkoxy, phenyl, halogen, or hydroxyl) with 1mol of a bishalogenomethyl compd. of the formula: R3CH2X (wherein R3 is phenylene, alkylated phenylene, biphenylene, a divalent diphenyl ether residue, or naphthylene; and X is a halogen).
ISHIDA TSUTOMU
TAKUMA HIROSUKE
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