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    • 6. 发明授权
    • Method for reducing the quantity of residual monomers in aqueous polymeric dispersions
    • 降低水性聚合物分散体中残余单体量的方法
    • US06433132B1
    • 2002-08-13
    • US09784452
    • 2001-08-17
    • Claudia WoodRoland BaumstarkJohannes Dobbelaar
    • Claudia WoodRoland BaumstarkJohannes Dobbelaar
    • C08F600
    • C08F6/006
    • A process for reducing the amount of residual monomer in aqueous polymer dispersions operates by aftertreatment with an initiator system essentially comprising a) from 0.001 to 5% by weight, based on the total monomer amount used to prepare the polymer dispersion, a1) of an oxidizing agent R1OOH,  where R1 is hydrogen or a C1-C8-alkyl or a C6-C12-aryl group, and/or a2) of a compound which in aqueous medium releases hydrogen peroxide, and b) from 0.005 to 5% by weight, based on the total monomer amount used to prepare the polymer dispersion, of a reducing agent prepared from b1) an aldehyde R2CH═O,  where R2 is a C1-C12-alkyl group which may contain functional groups and/or may be olefinically unsaturated, and b2) an inorganic dithionite, and c) catalytic amounts of a polyvalent metal ion which is able to exist in a plurality of valence states.
    • 用于降低聚合物水分散体中残余单体量的方法通过用引发剂体系进行后处理来操作,所述引发剂体系基本上包含a)0.001至5重量%,基于用于制备聚合物分散体的总单体量,a1)氧化剂 其中R1是氢或C1-C8烷基或C6-C12-芳基,和/或a2)在水性介质中释放过氧化氢的化合物,和b)0.005至5重量%,基于总单体 用于制备聚合物分散体的量,由b)醛,其中R2是可以含有官能团和/或可以是烯属不饱和的C1-C12-烷基,和b2)无机连二亚硫酸盐,和c)催化量 的能够以多个价态存在的多价金属离子。