| 摘要 |
PURPOSE:To produce the title low-MW polymer in good yield, by polymerizing an acrylic monomer in the presence of a specified polymerization initiator. CONSTITUTION:A mixture of hydrogen peroxide solution with benzene, methyl isobutyl ketone and p-toluenesulfonic acid is cooled, and water is removed from the mixture by azeotropic distillation in a vacuum to obtain a reaction mixture. Water is added to this reaction mixture and the pH is adjusted to about 5.5 by the addition of NaOH. Xylene is added to the organic layer and the benzene is removed by vacuum distillation to obtain a polymerization initiator comprising methyl isobutyl ketone peroxide containing type 4 of formula II and at least 70% type 3 of formula I. An acrylic monomer [e.g., methyl (meth)acrylate] or a mixture thereof with monomers copolymerizable therewith (e.g., styrene) is (co)polymerized at 90-160 deg.C in a solvent (e.g., toluene) in the presence of 0.5-10wt% said polymerization initiator.
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