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    • 16. 发明公开
    • PVC-based resin compositions and graft copolymers for use in these
    • Kunstharzmischungen auf PVC-Basis und zu ihrer Herstellung verwendbare Pfropfcopolymere。
    • EP0278788A2
    • 1988-08-17
    • EP88301232.0
    • 1988-02-15
    • KUREHA KAGAKU KOGYO KABUSHIKI KAISHA
    • Hoshino, MitsuruYusa, HaruhikoSuzuki, Katsumi
    • C08L27/06C08F279/02
    • C08F285/00C08L27/06C08L51/00C08F212/08C08L2666/24
    • A PVC-based resin composition comprises 3 - 30 wt.% of a graft copolymer and 97 - 70 wt.% of a PVC-­based resin and has highly-balanced properties between impact resistance, transparency and stress-whitening resistance and excellent processing characteristics. The graft copolymer has been obtained by graft-­polymerizing, in the presence of a latex containing 70 - 85 parts by weight of a rubbery butadiene-based polymer formed of 65 - 85 wt.% of butadiene, 15 - 35 wt.% of styrene and 0 - 3 wt.% of crosslinkable monomer, (i) 5 - 24 parts by weight of a first monomer mixture as a first-stage component, said first monomer mixture being composed of 70 - 97 wt.% of methyl methacrylate and 30 - 3 wt.% of an alkyl acrylate whose alkyl group has 1 - 8 carbon atoms; and then (ii) 3 - ­21 parts by weight of a second monomer mixture as a second-stage component, said second monomer mixture being composed of 97 - 100 wt% of styrene and 0 - 3 wt.% of crosslinkable monomer. The sum of the first and second monomer mixtures and the rubbery butadiene-based polymer is 100 parts by weight. The monomers grafted in the first stage amount to 30 - 80 wt.% of the sum of the grafted monomers. The graft polymer is also new.
    • PVC基树脂组合物包含3-30重量%的接枝共聚物和97-70重量%的PVC基树脂,并且在抗冲击性,透明度和耐应力白化性以及优异的加工特性之间具有高度平衡的性能 。 接枝共聚物通过在含有70-85重量份由65-85重量%丁二烯,15-35重量%苯乙烯形成的橡胶状丁二烯基聚合物的胶乳存在下进行接枝聚合而获得, 和0-3重量%的可交联单体,(i)5-24重量份作为第一阶段组分的第一单体混合物,所述第一单体混合物由70-97重量%甲基丙烯酸甲酯和30重量% - 3重量%的烷基具有1-8个碳原子的丙烯酸烷基酯; 然后(ii)3-21重量份作为第二阶段组分的第二单体混合物,所述第二单体混合物由97-100重量%的苯乙烯和0-3重量%的可交联单体组成。 第一和第二单体混合物和橡胶状丁二烯类聚合物的总和为100重量份。 在第一阶段中接枝的单体量为接枝单体总和的30-80重量%。 接枝聚合物也是新的。