| 摘要 |
<p>A process for producing a lactone polyester/unsaturated monomer represented by the structural formula (1), characterized by reacting a carboxylated, radical-polymerizable, unsaturated monomer with a cyclic lactone in the presence of water added in an amount of 1 to 50 parts by weight per 100 parts by weight of the sum of the carboxylated, radical-polymerizable, unsaturated monomer and the cyclic lactone with the aid of an acid catalyst at ordinary pressure and subsequently conducting a dehydration reaction under vacuum so as to remove low-boiling matters to thereby form an ester linkage between the carboxylated, radical-polymerizable, unsaturated monomer and a lactone oligomer which is a by-product of a reaction initiated by the water added and reduce the hydroxy value to 5.0 mg-KOH/g or lower. Thus, a carboxy-terminated lactone polyester/unsaturated monomer of practical quality can be produced at low cost. Formula (1) (In the formula, R<1>, R<2>, R<3>, R<4>, R<5>, R<6>, and R<7> each represents hydrogen or a substituent selected among C1-10 (un)substituted alkyl, (un)substituted aryl, (un)substituted alkoxycarbonyl, (un)substituted alkoxy, (un)substituted aryloxy, and halogeno; n is an integer of 1 to 7; and m is an integer of 1 to 100.)</p> |
