초록 ▼

A process for reducing the amount of residual monomer in aqueous polymer dispersions operates by aftertreatment with an initiator system essentially comprisinga) from 0.001 to 5% by weight, based on the total monomer amount used to prepare the polymer dispersion,a1) of an oxidizing agentR1OOH, where

A process for reducing the amount of residual monomer in aqueous polymer dispersions operates by aftertreatment with an initiator system essentially comprisinga) from 0.001 to 5% by weight, based on the total monomer amount used to prepare the polymer dispersion,a1) of an oxidizing agentR1OOH, where R1 is hydrogen or a C1-C8-alkyl or a C6-C12-aryl group, and/ora2) of a compound which in aqueous medium releases hydrogen peroxide, andb) from 0.005 to 5% by weight, based on the total monomer amount used to prepare the polymer dispersion, of a reducing agent prepared fromb1) an aldehydeR2CH.dbd.O, where R2 is a C1-C12-alkyl group which may contain functional groups and/or may be olefinically unsaturated, andb2) an inorganic dithionite, andc) catalytic amounts of a polyvalent metal ion which is able to exist in a plurality of valence states.

대표청구항 ▼

1. A process for reducing the amount of residual monomer in aqueous polymer dispersions by aftertreatment with an initiator system, which comprises said aftertreatment in the aqueous polymer dispersion being accompanied by the addition of an initiator system essentially comprisinga) from 0.001 to 5%

1. A process for reducing the amount of residual monomer in aqueous polymer dispersions by aftertreatment with an initiator system, which comprises said aftertreatment in the aqueous polymer dispersion being accompanied by the addition of an initiator system essentially comprisinga) 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.dbd.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.