| 摘要 |
PURPOSE:To obtain a polymer composition capable of providing nonshrinkable molded products without whitening surfaces, by blending an unsaturated polyester or vinyl ester polymer with a specific spiro compound. CONSTITUTION:A polymer composition obtained by blending (A) 100pts.wt. solid content of (A1) an unsaturated polyester polymer, e.g. prepared by reacting propylene glycol with maleic anhydride and dissolving the resultant unsaturated polyester in an alpha,beta-unsaturated monomer (preferably styrene) or (A2) vinyl ester polymer (e.g. epoxy acrylate or unsaturated polyester acrylate) having preferably 100-600 unsaturated group equiv. with (B) preferably 10-500pts.wt., especially preferably 30-200pts.wt. spiro compound expressed by the formula (m is 3, 4 or 5) [e.g. 2-methylene-1,4,6-trioxaspiro(4,6)undecane].
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