Method for controlling the thickening of aqueous systems
AssigneeBASF SE
InventorsKarl-Heinz Buchner, Stephan Nied, Frank Klippel, Alexander Gothlich, Gunnar Schornick
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Abstract
A method for controlling the thickening of aqueous systems comprising silicates, which comprises adding to the aqueous system at least one copolymer of a mean molecular weight Mw of greater than 60 000 g/mol and the copolymer being made up essentially randomly from monoethylenically unsaturated monocarboxylic acids, monoethylenically unsaturated dicarboxylic acids and optionally other ethylenically unsaturated comonomers, the quantitative figures being respectively based on the total amount of all monomers used.
Claims18
A method for controlling the thickening of aqueous systems comprising silicates, which comprises adding to the aqueous system at least one copolymer of a mean molecular weight Mw of greater than 60 000 g/mol and the copolymer being made up essentially randomly from the following monomeric units:
- (A) 30 to 99.9% by weight of at least one monoethylenically unsaturated monocarboxylic acid,
- (B) 0.1 to 70% by weight of at least one monoethylenically unsaturated dicarboxylic acid of the general formula
- (HOOC)R1C═CR2(COOH) (I),
- and/or
- R1R2C═C(—(CH2)n—COOH)(COOH) (II)
- or the corresponding carboxylic anhydrides and/or other hydrolyzable derivatives
- R1 and R2 independently of one another being H or a straight-chain or branched, optionally substituted, alkyl radical having 1 to 20 carbon atoms, or in the case of (I), R1 and R2 together being an optionally substituted alkylene radical having 3 to 20 carbon atoms, and
- n being an integer from 0 to 5,
- and also
- (C) 0 to 40% by weight of at least one further ethylenically unsaturated comonomer different from (A) and (B),
- the quantities given in each case being based on the total amount of all monomers used.
A thickened aqueous system which has a thickening factor from 1.1 to 8 and comprises at least one copolymer having a mean molecular weight Mw of greater than 60 000 g/mol having an essentially random structure of the copolymer made up of the following units:
- (A) 30 to 99.9% by weight of at least one monoethylenically unsaturated monocarboxylic acid,
- (B) 0.1 to 70% by weight of at least one monoethylenically unsaturated dicarboxylic acid of the general formula
- HOOC)R1C═CR2(COOH) (I),
- and/or
- R1R2C═C(—(CH2)n—COOH)(COOH) (II),
- or the corresponding carboxylic anhydrides and/or other hydrolyzable derivatives
- R1 and R2 independently of one another being H or a straight-chain or branched, optionally substituted, alkyl radical having 1 to 20 carbon atoms, or in the case of (I), R1 and R2 together being an optionally substituted alkylene radical having 3 to 20 carbon atoms, and
- n being an integer from 0 to 5,
- and also
- (C) 0 to 40% by weight of at least one further ethylenically unsaturated comonomer different from (A) and (B),
- the quantities given in each case being based on the total amount of all monomers used.
Dependencies are inferred from the claim text.