| 摘要 |
PURPOSE:To raise the glass transition point of a cured article and to lower the modulus and the internal stress of said cured article, by incorporating spherical arom. vinyl compd. polymer particles having a specified particle size in an epoxy resin compsn. contg. a novolak type epoxy resin, a phenolic novolak and an inorg. filler as essential ingredients. CONSTITUTION:Spherical arom. vinyl compd. polymer particles having an average particle size of 3-100mu are blended with an epoxy resin compsn. contg. a novolak epoxy resin, a phenolic novolak and an inorg. filler as essential ingredients. The spherical polymer particles can be obtd. by homogenizing an aq. dispersion contg. a monomer component mainly composed of an arom. vinyl compd. (e.g. styrene, substd. styrene or vinylnaphthalene), a catalyst soluble in said monomer and an anionic emulsifier and then polymerizing it. Other copolymerizable ethylenically unsaturated monomer and/or a crosslinking monomer can be used as the comonomer other than the above-mentioned arom. vinyl compd.
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