Associative thickener dispersion
AssigneeBASF SE
InventorsReinhold J Leyrer, Kati Schmidt
Life of this patent
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Abstract
An aqueous dispersion of a copolymer with copolymerized units a) of at least one ethylenically unsaturated carboxylic acid, b) of at least one nonionic ethylenically unsaturated surfactant monomer, c) of at least one C1-C2-alkyl methacrylate, d) of at least one C2-C4-alkyl acrylate, where the alkyl chain length averaged over the number of alkyl groups of the alkyl acrylate is 2.1 to 4.0, is described. Following neutralization with alkali, the dispersion serves as associative thickener, in particular for liquid detergent and cleaner formulations. The thickeners are characterized by high transparency and high thickening effect coupled with high shear dilution.
Claims19
An associative thickener comprising an aqueous dispersion of an alkali-soluble copolymer with copolymerized units comprising
- a) 10 to 75% by weight of at least one ethylenically unsaturated carboxylic acid,
- b) at least one nonionic ethylenically unsaturated surfactant monomer,
- c) at least one C1-C2-alkyl methacrylate, and
- d) at least one C2-C4-alkyl acrylate, wherein the alkyl chain length averaged over the number of alkyl groups of the alkyl acrylate is 2.1 to 4.0,
- wherein the copolymer is a single-stage copolymer.
A method for the preparation of an associative thickener, where a thermally activatable free-radical polymerization initiator is initially introduced and a monomer mixture is added which comprises
- a) 10 to 75% by weight of at least one ethylenically unsaturated carboxylic acid,
- b) at least one nonionic ethylenically unsaturated surfactant monomer,
- c) at least one C1-C2-alkyl methacrylate, and
- d) at least one C2-C4-alkyl acrylate, where the alkyl chain length averaged over the number of alkyl groups of the alkyl acrylate is 2.1 to 4.0.
A method for the preparation of an associative thickener, where a monomer mixture which comprises
- a) 10 to 75% by weight of at least one ethylenically unsaturated carboxylic acid,
- b) at least one nonionic ethylenically unsaturated surfactant monomer,
- c) at least one C1-C2-alkyl methacrylate, and
- d) at least one C2-C4-alkyl acrylate, where the alkyl chain length averaged over the number of alkyl groups of the alkyl acrylate is 2.1 to 4.0,
- is added to an aqueous initial charge and during the addition of the monomer mixture, at least at times, an oxidizing agent component and a reducing agent component of a redox initiator system are added.
Dependencies are inferred from the claim text.