Polymer dispersions
AssigneeBASF SE
InventorsStefan Dreher, Bernd Reck, Michael Seufert, Christian Pfaff
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Abstract
A description is given of a polymer dispersion comprising i) polymer particles dispersed in an aqueous medium and composed of units of ethylenically unsaturated monomers, ii) a water-soluble polymeric polyelectrolyte which along a polymeric backbone carries a large number of ionic groups of uniform charge character or groups which can be ionized to such groups, and iii) an ionic surfactant which carries an ionic group having a charge character opposite to that of the polymeric polyelectrolyte, or a group which can be ionized to such a group. The polymer dispersion can be coagulated by simple dilution with water.
Claims26
A polymer dispersion comprising
- i) polymer particles dispersed in an aqueous medium and composed of units of ethylenically unsaturated monomers,
- ii) a water-soluble polymeric polyelectrolyte which along a polymeric backbone carries a large number of ionic groups of uniform charge character or groups which can be ionized to such groups, and
- iii) 2.5 to 15% by weight, based on the total weight of the polymer dispersion, of an ionic surfactant which carries an ionic group having a charge character opposite to that of the polymeric polyelectrolyte, or a group which can be ionized to such a group.
A polymer dispersion comprising
- i) polymer particles dispersed in an aqueous medium and composed of units of ethylenically unsaturated monomers,
- ii) a water-soluble polymeric polyelectrolyte which along a polymeric backbone carries a large number of ionic groups of uniform charge character or groups which can be ionized to such groups, and
- iii) an ionic surfactant which carries an ionic group having a charge character opposite to that of the polymeric polyelectrolyte, or a group which can be ionized to such a group,
- wherein the polyelectrolyte is selected from the group consisting of
- a) a polyelectrolyte composed of units of ethylenically unsaturated monomers and 20-100% by weight, based on the total monomer units, of units of ethylenically unsaturated C3-C8 monocarboxylic acids;
- C4-C8 dicarboxylic acids or their monoesters;
- sulfonic acids;
- sulfuric monoesters or phosphonic acids and/or salts thereof, and the ionic surfactant is a quaternary ammonium salt having at least one hydrocarbon chain of at least 6 carbon atoms;
- b) a polyelectrolyte composed of units of ethylenically unsaturated monomers and 20-100% by weight, based on the total monomer units, of units of ethylenically unsaturated sulfonic acids, sulfuric monoesters or phosphonic acids and/or salts thereof and the ionic surfactant is an amine having at least one hydrocarbon chain of at least 6 carbon atoms, or a protonated form thereof;
- and
- c) a cationic polymeric polyelectrolyte composed of units of ethylenically unsaturated monomers and 20-100% by weight, based on the total monomer units, of units of monoethylenically unsaturated monomers which carry a quaternary ammonium group or a protonizable amino group and the ionic surfactant is an anionic surfactant which is selected from the group consisting of alkyl sulfates, sulfuric monoesters with ethoxylated alkyl alcohols, sulfuric monoesters with ethoxylated C4-C9 alkylphenols, alkylsulfonates, alkenylsulfonates, alkylarylsulfonates, alkylglyceryl ether sulfonates, alkyl phosphates, dialkyl phosphates, alkylaryl phosphates, alkylphosphonates, alkenylphosphonates, alkylarylphosphonates, monoalkyl esters of sulfosuccinic acid, dialkyl esters of sulfosuccinic acid, singly ring-sulfonated monoalkylbiphenyl ethers, multiply ring-sulfonated monoalkylbiphenyl ethers, methylcarboxylates of ethoxylated alkyl alcohols, and C6-C22 carboxylic acids.
Dependencies are inferred from the claim text.