Method for reducing the quantity of residual monomers in aqueous polymeric dispersions
First Claim
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
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Accused Products
Abstract
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
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
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.
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Citations
13 Claims
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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 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
Specification