| 摘要 |
PURPOSE:To obtain the title copolymer excellent in adhesion to metal, by copolymerizing a vinyl ester with an unsaturated carboxylic acid by feeding them continuously or in divided portions to the reaction system. CONSTITUTION:The title copolymer of a number-average MW of 10,000-100,000 is obtained by copolymerizing a vinyl ester (A) (e.g., vinyl acetate) selected from among vinyl carboxylates and (meth)acrylates with an unsaturated carboxylic acid (B) (e.g., acrylic acid) at 50-100 deg.C, preferably, 60-90 deg.C in the presence of a polymerization initiator (e.g., azobisisobutyronitrile) in 2-3pts. vol., per pt.vol. component A, solvent (e.g., CH3OH) by feeding a mixture of components A and B at a molar ratio of 99.6-90/0.4-10 (wherein the amount of component B is represented in terms of a monobasic acid) continuously or in divided portions to the reaction system.
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