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    • 5. 发明授权
    • Process for producing rubber-based graft copolymers
    • 生产橡胶基接枝共聚物的方法
    • US4897462A
    • 1990-01-30
    • US364496
    • 1989-06-09
    • Haruhiko YusaMitsuru HoshinoHaruki Isaka
    • Haruhiko YusaMitsuru HoshinoHaruki Isaka
    • C08F291/00C08F6/22C08F279/02C08F291/02C08J3/16
    • C08J3/16C08F279/02C08F6/22
    • In a process for producing a rubber-containing graft copolymer, which comprises bringing a latex of a graft copolymer comprising 60% to 90% by weight of a rubbery polymer and 40% to 10% by weight of a hard polymer, said graft copolymer latex being obtained by emulsion polymerizing a hard polymer-forming monomer in a latex of said rubbery polymer and having a minimum film-forming temperature of 75.degree. C. or less, into contact with an aqueous electrolyte solution under stirring, thereby to coagulate the latex, and recovering the precipitated graft copolymer, the improvement is disclosed such that the graft copolymer latex is subjected to slow coagulation so as to allow the graft copolymer to precipitate as substantially spherical particles, wherein the term "slow coagulation" refers to coagulation which proceeds at a milder rate than that of coagulation in which the aqueous electrolyte solution is hydrochloric acid and the pH of the latex during coagulation is 1.8 or less.
    • 在制备含橡胶接枝共聚物的方法中,其包括将包含60重量%至90重量%的橡胶状聚合物和40重量%至10重量%的硬质聚合物的接枝共聚物的胶乳,所述接枝共聚物胶乳 通过将所述橡胶状聚合物的胶乳中的硬聚合物形成性单体乳液聚合并且最低成膜温度为75℃以下,在搅拌下与含水电解质溶液接触而使胶乳凝聚而得到, 回收沉淀的接枝共聚物时,公开了使接枝共聚物胶乳缓慢凝固以使接枝共聚物沉淀为基本上球形的颗粒的改进,其中术语“缓慢凝固”是指在 其中电解质溶液为盐酸,凝固时的胶乳pH为1.8以下。
    • 6. 发明授权
    • Powdery graft-copolymer composition
    • 粉状接枝共聚物组合物
    • US4275178A
    • 1981-06-23
    • US108278
    • 1979-12-28
    • Haruhiko YusaMasanori OotaKatsumi Suzuki
    • Haruhiko YusaMasanori OotaKatsumi Suzuki
    • C08F2/00C08F2/22C08F291/00C08L7/00C08L21/00C08L33/00C08L33/02C08L51/00C08L51/02C08L51/04C08L55/02
    • C08L51/003C08L51/04
    • Graft-copolymers for improving impact strength comprising a relatively large quantity of an elastomeric trunk polymer, such as acrylonitrile/styrene/butadiene resins and methyl methacrylate/styrene/butadiene resins, have some undesirable powder characteristics, for example, poor fluidity and an easily blocking property.However, by blending a graft-copolymer of this type with a graft-copolymer comprising a relatively small quantity of an elastomeric trunk polymer in slurry form or dry state, it is possible to obtain a graft-copolymer blend with improved powder characteristics without significantly lowering the effect of improving the impact strength of the former graft-copolymer.The graft-copolymer blend thus obtained, when blended with a hard resin such as polyvinyl chloride, provides a resin composition with high impact strength.
    • 用于改善冲击强度的接枝共聚物包括相对大量的弹性体树脂聚合物,例如丙烯腈/苯乙烯/丁二烯树脂和甲基丙烯酸甲酯/苯乙烯/丁二烯树脂,具有一些不期望的粉末特性,例如流动性差和容易堵塞 属性。 然而,通过将这种类型的接枝共聚物与包含相对少量的浆料形式或干燥状态的弹性体树脂聚合物的接枝共聚物共混,可以获得具有改进的粉末特性而不显着降低的接枝共聚物共混物 改善前接枝共聚物冲击强度的效果。 由此获得的接枝共聚物共混物当与诸如聚氯乙烯的硬树脂共混时,提供了具有高冲击强度的树脂组合物。
    • 7. 发明授权
    • Process for producing a graft-copolymer and blends therewith
    • 用于制备接枝共聚物并与其共混的方法
    • US4287312A
    • 1981-09-01
    • US28798
    • 1979-04-10
    • Haruhiko YusaMasanori OotaKatumi Suzuki
    • Haruhiko YusaMasanori OotaKatumi Suzuki
    • C08F279/00C08F279/02C08L51/04
    • C08F279/02
    • A process for producing a graft-polymer comprises adding an aqueous solution of a salt of a strong acid and a monovalent strong base, which solution has been adjusted to a pH value of 8 to 13, to a rubber latex containing diene rubber particles and a fatty acid soap as an emulsifying agent to coagulate the above mentioned rubber particles, and thereafter adding a vinyl monomer to the latex containing the coagulated rubber particles to graft-polymerize the vinyl monomer.According to this process, the formation of rubber masses and macroparticles during the coagulation is reduced and a rubber latex containing rubber particles having a narrow range of particle size distribution is obtained. When a graft-copolymer obtained by using the latex is blended with thermoplastic resins such as vinyl chloride resins, the impact resistance of the thermoplastic resins can be remarkably improved without impairing their transparency and gloss.
    • 制备接枝聚合物的方法包括将含有二烯橡胶颗粒的橡胶胶乳和强酸的一价强碱的水溶液和已经调节至pH值为8至13的pH值的一价强碱 脂肪酸皂作为乳化剂凝结上述橡胶颗粒,然后在含有凝固的橡胶颗粒的胶乳中加入乙烯基单体以使乙烯基单体接枝聚合。 根据该方法,凝结时的橡胶质量和大颗粒的形成减少,得到含有窄粒径分布范围的橡胶粒子的橡胶胶乳。 当通过使用胶乳获得的接枝共聚物与诸如氯乙烯树脂的热塑性树脂共混时,热塑性树脂的耐冲击性可以显着提高而不损害其透明度和光泽。