Abstract: The invention relates to the use of vinyl phosphonic acid or a salt thereof for improving the biodegradability of mixed polymers, comprising 25 to 99.5% by weight of structural units of one or more monomers selected from the group made of compounds of formula (1) and formula (3), where R1 and R2 independently are hydrogen or C1-C4-alkyl, formula (4), where n is 3, 4, or 5, and formula (5), where X is OH or for NR3R4, and R3 and R4 independently are H or C1 to C4-alkyl, in that 0.5 to 25% by weight of vinyl phosphonic acid is polymerized into the mixed polymer.

Abstract: The invention relates to a copolymer containing: i) 80-90% by weight of one or more structural units of the formula A, where R1 is hydrogen or methyl, R2 is C2-C10-alkylene, and Me+ is an ammonium or an alkali metal ion; ii) from 1 to 10% by weight of one or more structural units of the formula B where R3 and R4 are each independently hydrogen, methyl or ethyl; iii) from 1 to 10% by weight of one or more structural units of the formula C, where n is a number from 1 to 6; iv) from 0.1 to 5% by weight of structural units of the formula D where X is hydrogen, an ammonium ion or an alkali metal ion; and optionally, v) from 0 to 10% by weight of one or more structural units of the formula E, where R5 is hydrogen, methyl and/or ethyl, with the proviso that the content in the copolymers of structural units B) and C) is from 6 to 15% by weight.

Abstract: A method for reducing or completely eliminating water influx in an oil or natural gas borehole includes introducing in the borehole an aqueous solution of a copolymer comprising: A) 40–98 wt. % of structural units of formula (I), wherein: R1 is hydrogen or methyl; R2 represents C2–C10 alkylene; and Me+ represents an ammonium metal ion and an alkali metal ion; B) 0.1 to 58 wt. % of structural units of formula (II); C) 0.1 to 10 wt. % of structural units of formula (III), wherein: R3 and R4 independently of each other represent hydrogen, methyl or ethyl, or R3 and R4 represent together a propylene group, which, with inclusion of a radical (A), form a pyrrolidon radical or, with inclusion of a pentamethylene group, forms a caprolactam radical; D) 0.10 to 10 wt % of structural units of formula (IV). The method also includes introducing in the ground or deposit, simultaneously with the copolymer or subsequently, an agent for crosslinking the copolymer.

Abstract: The invention relates to compositions comprising copolymers based on acryloyldimethyltaurine and also synergistic additives selected from anionic, cationic, nonionic, and betaine surfactants. The compositions exhibit a pronounced thermoassociative behavior and are outstandingly suitable as thickeners. The copolymers of the present invention are useful in formulating cosmetics, pharmaceuticals, and oil field chemicals.

Abstract: The invention relates to a copolymer containing i) 80-90% by weight of one or more structural units of the formula A where R1 is hydrogen or methyl, R2 is C2-C10-alkylene, and Me+ is an ammonium or an alkali metal ion, ii) from 1 to 10% by weight of one or more structural units of the formula B where R3 and R4 are each independently hydrogen, methyl or ethyl, iii) from 1 to 10% by weight of one or more structural units of the formula C, where n is a number from 1 to 6 iv) from 0.1 to 5% by weight of structural units of the formula D where X is hydrogen, an ammonium ion or an alkali metal ion, and optionally v) from 0 to 10% by weight of one or more structural units of the formula E where R5 is hydrogen, methyl and/or ethyl, with the proviso that the content in the copolymers of structural units B) and C) is from 6 to 15% by weight.

Abstract: A method for reducing or completely eliminating water influx in an oil or natural gas borehole includes introducing in the borehole an aqueous solution of a copolymer comprising: A) 40-98 wt. % of structural units of formula (I), wherein: R1 is hydrogen or methyl; R2 represents C2-C10 alkylene; and Me+ represents an ammonium metal ion and an alkali metal ion; B) 0.1 to 58 wt. % of structural units of formula (II); C) 0.1 to 10 wt. % of structural units of formula (III), wherein: R3 and R4 independently of each other represent hydrogen, methyl or ethyl, or R3 and R4 represent together a propylene group, which, with inclusion of a radical (A), form a pyrrolidon radical or, with inclusion of a pentamethylene group, forms a caprolactam radical; D) 0.10 to 10 wt % of structural units of formula (IV). The method also includes introducing in the ground or deposit, simultaneously with the copolymer or subsequently, an agent for crosslinking the copolymer.

Abstract: Compositions comprising copolymers based on acryloyldimethyltaurine and synergistic additives

Abstract: The use of copolymers containing structural units derived from the compounds of the formulae 1 and 2 in which R1 and R2 are H, C1-C4 alkyl or, with inclusion of the N—CO— group, form a ring of 5, 6, 7 or 8 ring atoms which in addition to the N—CO— group, may include further heteroatoms, R3 is H or C1-C4 alkyl, R4 is a branched or unbranched C1-C6 alkylene radical, and Y is an alkali metal or ammonium in amounts of from 0.01 to 2% by weight to prevent misting in water-based cooling lubricants.

Abstract: The invention provides for the use of copolymers containing structural units derived from the compounds of the formulae 1 and 2 in which R1 is H or C1-C4 alkyl, R2 is a branched or unbranched C1-C6 alkylene radical, and Y is an alkali metal or ammonium to prevent misting in water-based cooling lubricants.

Abstract: The invention relates to copolymers comprising a) 5-95% by weight of structural units which are derived from compounds of the formula 1 b) from 1 to 95% by weight of structural units which are derived from compounds of the formula 2  and c1) from 1 to 95% by weight of structural units which are derived from compounds of the formula 3  or, alternatively, to c1), c2) from 1 to 95% by weight of structural units which are derived from compounds of the formula 4  n which X is a cation. The copolymers according to the invention are suitable as a fluid loss additive for water-based drilling muds and for cement slurries in deep wells, for completion and clearing-out liquids and for water shut-off in production probes.

Abstract: The invention provides water-soluble copolymers without crosslinking, consisting of the following components: A 5-95% by weight of bivalent structural units derived from acrylamidopropenylmethylenesulfonic acid or its salts, B 1-45% by weight of bivalent structural units derived from open-chain N-vinylamides, C 1-45% by weight of bivalent structural units derived from cyclic N-vinyl-substituted amides, and if desired D 0-50% by weight of a further comonomer selected from the group consisting of acrylamide, acrylic acid and acrylonitrile, the components A to C and, if present, D adding up to 100% by weight.

Abstract: The invention provides for the use of copolymers containing structural units derived from the compounds of the formulae 1 and 2 in which R1 and R2 independently of one another are a terminally unsaturated alkenyl radical having 3 to 5 carbon atoms, R3 and R4 independently of one another are C1-C4 alkyl, R5 is H or C1-C4 alkyl, R6 is a branched or unbranched C1-C6 alkylene radical, X is an anion, and Y is an alkali metal or ammonium to prevent misting in water-based cooling lubricants.