| 摘要 |
PURPOSE:To obtain the title composition excellent in electrical properties, mechanical properties and punching quality, by mixing a specified curable prepolymer with a crosslinking vinyl monomer. CONSTITUTION:A polymer (a) having a hydroxyl group in the side chain is reacted with an unsaturated isocyanate (b) having a free isocyanate group and a (meth)acryloyl group in the molecule to obtain a curable prepolymer (A) in which the main chain is a polymer obtained by vinyl polymerization and the side chain has a (meth)acryloyl group bonded to the main chain through two urethane bonds, represented by the formula [wherein A is the main chain part of a random copolymer, MW of 10,000-100,000, of a vinyl monomer with a (meth)acryloyl monomer, R is H or methyl and X1-2 are 2-16C hydrocarbon groups which may be bonded together through an ether bond, provided that the carbon bonded to the oxygen in X1 and X2 is primary or secondaryl]. 10-60wt% component A is mixed with 90-40wt% crosslinking vinyl monomer (B) (e.g., styrene) to obtain a resin composition used to form a resin composition for electrical laminates.
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