| 摘要 |
<p>PURPOSE:The titled composition excellent in heat shock resistance, comprising an epoxy resin, a novolak phenolic resin, a phenolaralkyl resin and a specified styrene copolymer. CONSTITUTION:100pts.wt. epoxy resin (A) having at least two epoxy groups in the molecule and having a softening point of 60-100 deg.C and an epoxy equivalent weight of 100-300, which may contain 30wt% or below flame-retarding epoxy resin, is mixed with 50-90pts.wt. total of 10-50pts.wt. novolak phenolic resin of a softening point of 60-120 deg.C and a hydroxyl equivalent of 100-150 and 10-50pts.wt. phenolaralkyl resin (B) of a softening point of 80-120 deg.C and a hydroxyl equivalent of 195-235 and 2-40pts.wt. carboxyl group- containing styrene copolymer (C) (e.g., styrene/maleic acid copolymer) and this mixture is melted and kneaded.</p> |
