| 摘要 |
PURPOSE:The titled composition, obtained by blending a specific urethane acrylate with a specific monoacrylate as essential components in a specific proportion, curable by radiation and ultraviolet rays, having a high loss factor at low temperatures and low elastic modulus and suitable for speakers. CONSTITUTION:A composition obtained by blending (A) an urethane acrylate prepared by reacting a diisocyanate with both ends of a copolymer of (i) propylene oxide having 1,500-10,000mol.wt. and hydroxyl groups at both ends with (ii) tetrahydrofuran at 80/20-20/80mol ratio (i)/(ii) and further reacting the product with a compound having hydroxyl group and (meth)acryloyl group to introduce acryloyl groups into both ends thereof with (B) a monoacrylate expressed by the formula (R is aliphatic or aromatic group) as essential components. The amount of the components are as follows; 5-40wt% component (A) and 60-90wt% component (B).
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