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    • 12. 发明授权
    • Polymerization process for preparation of acrylamide homopolymers with
redox catalyst
    • 用氧化还原催化剂制备丙烯酰胺均聚物的聚合方法
    • US4282340A
    • 1981-08-04
    • US111402
    • 1980-01-11
    • Michael J. AnchorRobert Login
    • Michael J. AnchorRobert Login
    • C08F120/56C08F4/40
    • C08F120/56
    • There is disclosed a process for the aqueous polymerization of acrylamide to produce polymers of high molecular weight utilizing mixtures of water and monomer, at least one of which can be contaminated with small amounts of polymerization inhibiting components. In the process of the invention, a minimum amount of a redox pair catalyst is utilized in order to obtain the desired high molecular weight polymer. The minimum amount of catalyst is automatically provided to the polymerization mixture by adding a first member of a redox pair to the polymerization mixture and intimately combining a second member of the redox pair catalyst with an organic polymer capable of forming a colloidal dispersion in an aqueous medium and adding this intimate mixture to the mixture of water, acrylamide monomer, and a first member of the redox pair catalyst.The process disclosed provides for the slow release of one member of the redox pair catalyst from said intimate mixture into an aqueous solution or emulsion polymerization medium. As polymerization proceeds, an additional amount of catalyst is made available by the slow recess of one member of the redox pair into the aqueous polymerization medium. The polymerization process can be initiated and maintained at ambient temperatures and pressures. Thus polymerization is effected without providing additional heat or pressure to the reaction mass. Molecular weights of about 1 million to 10 million can be obtained where monomer concentrations are held between about 10 to about 50 percent by weight of the polymerization mixture.
    • 公开了一种丙烯酰胺的水性聚合方法,其使用水和单体的混合物制备高分子量的聚合物,其中至少一种可被少量的聚合抑制成分污染。 在本发明的方法中,为了获得所需的高分子量聚合物,使用最少量的氧化还原对催化剂。 通过向聚合混合物中加入第一氧化还原对成员并将氧化还原对催化剂的第二成员与能够在水性介质中形成胶体分散体的有机聚合物紧密结合,自动提供最小量的催化剂 并将该密实混合物加入到水,丙烯酰胺单体和氧化还原对催化剂的第一个成分的混合物中。 所公开的方法提供了一种氧化还原对催化剂从所述紧密混合物缓慢释放到水溶液或乳液聚合介质中。 随着聚合的进行,通过氧化还原对的一个成员的缓慢凹陷进入水性聚合介质,可以获得额外量的催化剂。 可以在环境温度和压力下启动和维持聚合过程。 因此,聚合是在不向反应物质提供额外的热或压力的情况下进行的。 当单体浓度保持在聚合混合物的约10至约50重量%之间时,可获得约100万至1000万的分子量。