| 摘要 |
PURPOSE:To prevent a vinyl ester copolymer product from being colored by preventing a vinyl ester copolymer solution from becoming turbid, by adding a specified olefin derivative as a polymerization short stop to the copolymer solution and, if required, removing unpolymerized monomer from the solution. CONSTITUTION:At least one member selected from among the phenyl group- containing olefin derivatives represented by formulae I, iI, and III (wherein R1 is H or alkyl, R2 is H or alkyl, alkoxy, amino, nitro or the like group, m is 0 or 1, n is 0-3 and l is 0-5) is added to a vinyl ester copolymer solution (e.g., vinyl acetate/alkyl acrylate copolymer solution). If desired, unpolymerized monomer is removed from the solution to obtain a vinyl ester copolymer. As said olefin derivatives, 2,4-diphenyl-4-methyl-1-pentene and 1,3-diphenyl-1-butene are desirable.
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