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    • 5. 发明授权
    • Emulsion process for preparing elastomeric vinyl acetate-ethylene
copolymer and high Mooney viscosity low gel content elastomer obtained
therefrom
    • 用于制备弹性体乙酸乙烯酯 - 乙烯共聚物的乳液法和由其获得的高门尼粘度低凝胶含量弹性体
    • US4287329A
    • 1981-09-01
    • US132946
    • 1980-03-24
    • Manfred Heimberg
    • Manfred Heimberg
    • C08F2/30C08F218/08
    • C08F218/08
    • In a process for preparing an elastomeric vinyl acetate-ethylene copolymer having high Mooney viscosity and low gel content wherein vinyl acetate monomer is copolymerized with ethylene monomer in an aqueous emulsion reaction medium containing surface active agent, polymerization catalyst and protective colloid to provide a latex and vinyl acetate-ethylene elastomer is recovered from the latex, an improvement is disclosed which comprises:copolymerizing from about 40% to about 70% by weight of vinyl acetate monomer with from about 60% to about 30% by weight of ethylene monomer in an aqueous emulsion reaction medium to provide a latex, the reaction medium for vinyl acetate-ethylene elastomer containing:(i) at least one surface active agent having a hydrophilic lipophilic balance value of at least 22 in an amount above about 2.0% by weight of the total monomer,(ii) a polymerization catalyst, and(iii) at least one protective colloid in an amount of less than about one part for each part by weight of total surface active agent, with the total weight of the surface active agent and vinyl acetate being present in the reaction medium at the commencement of copolymerization.
    • 在制备具有高门尼粘度和低凝胶含量的弹​​性体乙酸乙烯酯 - 乙烯共聚物的方法中,其中醋酸乙烯酯单体与含有表面活性剂的水乳液反应介质中的乙烯单体共聚,聚合催化剂和保护胶体以提供胶乳和 从胶乳中回收乙酸乙烯酯 - 乙烯弹性体,公开了一种改进,其包括:将约40重量%至约70重量%的乙酸乙烯酯单体与约60重量%至约30重量%的乙烯单体在水性 乳液反应介质以提供胶乳,用于乙酸乙烯酯 - 乙烯弹性体的反应介质包含:(i)至少一种具有至少22的亲水亲油平衡值的表面活性剂,其量超过总量的约2.0重量% 单体,(ii)聚合催化剂,和(iii)至少一种保护胶体,其量小于每份的约一份 的总表面活性剂,在共聚开始时,表面活性剂和乙酸乙烯酯的总重量存在于反应介质中。
    • 10. 发明授权
    • Process for preparing high solids copolymer latices with low viscosity
    • 制备低粘度高固含量共聚物胶乳的方法
    • US4409355A
    • 1983-10-11
    • US344234
    • 1982-01-29
    • Manfred Heimberg
    • Manfred Heimberg
    • C08F218/04C08F263/04C08F265/04C08L33/08C08L33/10
    • C08F218/04C08F263/04C08F265/04
    • A process is disclosed for preparing copolymer latices possessing a solids content of at least about 60 weight percent and a viscosity not exceeding 15,000 cp. Brookfield Viscosity (RVF, Spindle No. 4) at 2 rpm from (a) vinyl acetate in an amount representing from about 10 weight percent to about 95 weight percent of total monomer charge, and (b) at least one monomer selected from the group consisting of acrylate ester, methacrylate ester and vinyl ester of an alpha-branched saturated monocarboxylic acid representing the balance of the total monomer charge. The aforesaid latices are prepared by polymerizing in a single reaction stage at least 10 weight percent of the total vinyl acetate monomer (a) and from 0 to about 50 weight percent of the total acrylate ester, methacrylate ester and/or vinyl ester of alpha-branched saturated monocarboxylic acid monomer (b) in an aqueous emulsion reaction medium containing a polymerization catalyst, and thereafter polymerizing in said reactor in a second stage the remaining portion of the total vinyl acetate monomer (a) together with the remaining portion of the acrylate ester, methacrylate ester, and/or vinyl ester of alpha-branched saturated carboxylic acid monomer (b) in the reaction medium containing additional catalyst if needed, polymerization being continued substantially to completion.
    • 公开了一种制备具有至少约60重量%的固体含量和不超过15,000cp的粘度的共聚物胶乳的方法。 来自(a)乙酸乙烯酯的2rpm的布鲁克菲尔德粘度(RVF,主轴No.4)的量占总单体电荷的约10重量%至约95重量%,和(b)至少一种选自组 由α-支链饱和一元羧酸的丙烯酸酯,甲基丙烯酸酯和乙烯基酯组成,代表总单体电荷的平衡。 上述胶乳通过在单个反应阶段中聚合至少10重量%的总乙酸乙烯酯单体(a)和0至约50重量%的总丙烯酸酯,甲基丙烯酸酯和/或α-烯烃的乙烯基酯来制备, 支链饱和一元羧酸单体(b)在含有聚合催化剂的水乳液反应介质中,然后在第二阶段在所述反应器中聚合,将总的乙酸乙烯酯单体(a)的剩余部分与剩余部分的丙烯酸酯 ,甲基丙烯酸酯和/或α-支链饱和羧酸单体(b)的乙烯基酯,如果需要,在含有另外的催化剂的反应介质中,聚合继续基本上完成。