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    • 2. 发明授权
    • Process for preparing pressure sensitive adhesives
    • 制备压敏粘合剂的方法
    • US4725639A
    • 1988-02-16
    • US550324
    • 1983-11-09
    • William E. Lenney
    • William E. Lenney
    • C08F2/00C08F2/22C08F218/04C08F220/06C08F220/12C08F220/18C09J131/04C09J133/04C09J133/06
    • C08F220/12C08F218/04C09J131/04C09J133/064C09J2201/606
    • In a process for preparing a pressure sensitive adhesive emulsion containing a polymer having a Tg of -10.degree. C. or below which comprises polymerizing in an aqueous emulsion (a) an alkyl acrylate or vinyl ester, (b) an olefinically unsaturated carboxylic acid and (c) a polyolefinically unsaturated monomer for enhancing cohesive strength of the polymer, the method for enhancing the shear resistance of the pressure sensitive adhesive polymer which comprises(1) forming an aqueous suspension reaction mixture comprising a stabilizing agent and at least a portion of the alkyl acrylate or vinyl ester,(2) initiating the reaction mixture by the addition of a free radical source at a temperature from about 10.degree.-40.degree. C. and bringing the reaction mixture to a reaction temperature of from 45.degree.-85.degree. C. within a period of not more than 2 hours with the reaction temperature exceeding the initiation temperature by at least 15.degree. C.,(3) adding the olefinically unsaturated carboxylic acid monomer and the polyolefinically unsaturated monomer at a substantially uniform rate such that the major portion of the carboxylic acid and polyolefinically unsaturated monomers has been added by the time the alkyl acrylate and vinyl ester content as free monomer in the reaction mixture has been reduced to a level of less than about 10 wt % of the mixture, and(4) continuing polymerization of the reaction mixture until the alkyl acrylate and vinyl ester content as free monomer in the reaction mixture is reduced below about 1 wt %.
    • 在制备含有Tg为-10℃或更低的聚合物的压敏粘合剂乳液的方法中,该聚合物包括在水性乳液(a)中丙烯酸烷基酯或乙烯基酯聚合,(b)烯属不饱和羧酸和 (c)用于提高聚合物的内聚强度的聚烯烃不饱和单体,用于增强压敏粘合剂聚合物的抗剪切性的方法,其包括(1)形成含有稳定剂的水悬浮反应混合物和至少一部分 丙烯酸烷基酯或乙烯基酯,(2)通过在约10 -40℃的温度下加入自由基来引发反应混合物,并使反应混合物的反应温度为45-85℃ 在不超过2小时的时间内,反应温度超过起始温度至少15℃,(3)加入烯属不饱和羧酸m 单体和聚烯烃不饱和单体以大致均匀的速率使得大部分羧酸和聚烯烃不饱和单体在反应混合物中作为游离单体的丙烯酸烷基酯和乙烯基酯含量已经降低至一定水平 小于约10重量%的混合物,和(4)反应混合物的持续聚合直到反应混合物中作为游离单体的丙烯酸烷基酯和乙烯基酯含量降低到约1重量%以下。
    • 6. 发明授权
    • Continuous emulsion polymerization of vinyl acetate and ethylene
    • 乙酸乙烯酯和乙烯的连续乳液聚合
    • US4164489A
    • 1979-08-14
    • US899421
    • 1978-04-24
    • Wiley E. DanielsWilliam E. Lenney
    • Wiley E. DanielsWilliam E. Lenney
    • C08F2/00C08F2/22C08F10/00C08F210/00C08F210/02C08F218/00C08F218/02C08F218/08C08F263/04C08L23/04
    • C08F263/04
    • This invention relates to an improved continuous process for producing vinyl acetate-ethylene copolymer emulsions. The improvement for continuous polymerization of vinyl acetate and ethylene comprises continuously charging a reaction mixture containing vinyl acetate and ethylene to a polymerization vessel, conducting an initial polymerization of the vinyl acetate and ethylene in the presence of a seed latex under ethylene pressure and continuously removing the thus formed latex from the initial polymerization vessel at an unreacted vinyl acetate monomer content from 5-20% by weight of the latex and then effecting a post polymerization of the unreacted vinyl acetate at an ethylene pressure of not more than about 300 psia until the unreacted vinyl acetate in the latex is less than 1% by weight.
    • 本发明涉及生产乙酸乙烯酯 - 乙烯共聚物乳液的改进的连续方法。 乙酸乙烯酯和乙烯的连续聚合的改进包括将含有乙酸乙烯酯和乙烯的反应混合物连续加入到聚合容器中,在乙烯压力下在种子胶乳存在下进行乙酸乙烯酯和乙烯的初始聚合,并连续除去 由此在初始聚合容器中形成胶乳,其未反应的乙酸乙烯酯单体含量为胶乳的重量的5重量%,然后在不超过约300psia的乙烯压力下进行未反应的乙酸乙烯酯的后聚合,直至 胶乳中未反应的乙酸乙烯酯的含量小于1重量%。