| 摘要 |
PURPOSE:To form an aqueous emulsion capable of giving excellent solvent resistance, blocking resistance, heat resistance, etc., by polymerizing an aqueous vinyl monomer in the presence of a seed emulsion comprising a (meth) acrylonitrile copolymer. CONSTITUTION:At least one aqueous vinyl monomer is polymerized in the presence of a seed emulsion containing 10-50wt.% (meth)acrylonitril in the comonomers to form an aqueous emulsion of a copolymer having a two-layered structure. The ratio of the seed emulsion to the aqueous vinyl monomer component is generally about (50:50) to (95:5) on a solid basis. As the aqueous vinyl monomer component, a mixture usually containing about 50-100wt.% (meth) acrylamide is used. The above-mentioned aqueous emulsion is useful as, e.g. an undercoating agent for a release paper, a material for treating the rear of a release paper, a binder for a diazo photosensitive paper, and a binder for an offset master.
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