Abstract: An admixture comprises an aqueous composition of a) a copolymeric dispersing component, b) an antifoaming agent component, c) a surfactant component, and d) water. The components may be a blend or physically or chemically attached and result in a stable liquid system that can be used as a dispersing agent for a calcium sulfate compound containing construction chemicals composition.

Abstract: The invention relates to the use of water-soluble polymers, consisting of a) monoethylenically unsaturated monomers consisting of acidic groups in an acidic, partially or fully neutralized form and b) other monomers which can be copolymerized with monomers a) as a drying agent for the production of redispersion power and/or powdery polymer dispersing agents. The water-soluble polymers contain at least 20 wt. % monomers (a) and a maximum of 8O wt. % monomers (b) and are supplied to the production process in the form of aqueous solutions in amounts of up to 50 wt. % maximum, enabling powder, polymer products with a residual moisture of <2 wt. % to be obtained, particularly in spray drying processes, and which are added to mineral systems as dispersing agents in amounts of 0.05-5 wt. % or are used as building materials for the mineral binding of redispersion powder in adhesives or as a binders in their own right.

Abstract: Preparing a non-ionic copolymer having a hydrolysable monomer residue and a polyether macromonomer residue in a semicontinuous mode in a polymerization reactor associated with a metering device, including introducing polyether macromonomer and water into the reactor, wherein hydrolysable monomer which is added thereto forms a polymerization reaction mixture; introducing hydrolysable monomer into the metering device; adding hydrolysable monomer into the reactor from the metering device; passing a free radical polymerization initiator into the reactor before and/or during the addition of the hydrolysable monomer, the hydrolysable monomer and the polyether macromonomer reacting by free radical polymerization to form the non-ionic copolymer; and, subjecting the reaction mixture to polymerization while an addition rate of the hydrolysable monomer and/or at least a component of the polymerization initiator is varied stepwise or continuously.

Abstract: An admixture comprises an aqueous composition of a) a copolymeric dispersing component, b) an antifoaming agent component, c) a surfactant component, and d) water. The components may be a blend or physically or chemically attached and result in a stable liquid system that can be used as a dispersing agent for a calcium sulfate compound containing construction chemicals composition.

Abstract: Copolymers include two monomer components, a) an olefinic unsaturated monocarboxylic acid comonomer or an ester or a salt thereof of an olefinic unsaturated sulfuric acid comonomer or a salt thereof, and b) an ether comonomer of the general formula (I) Components a) and b) are present in amounts of from 30 to 90 mol-% and from 70 to 10 mol-%, respectively, and comonomer component a) is selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, allylsulfonic acid, vinylsulfonic acid and a salt thereof or an alkyl or hydroxyalkyl ester. Compositions including a hydraulic binder such as cement, gypsum, lime and anhydrite and the copolymer are also disclosed. The copolymer can be used as superplasticizer or dispersant for non-hardened (wet) and a hydraulic binder containing compositions.

Abstract: This invention relates to copolymers consisting of two monomer components whereby component a) is an olefinic unsaturated monocarboxylic acid comonomer or an ester or a salt thereof of an olefinic unsaturated sulfuric acid comonomer or a salt thereof, and component b) is an ether comonomer of the general formula R1—O—R2. The copolymer shall comprise the said components a) and b) in amounts of from 30 to 90 mol-% and from 70 to 10 mol-%, respectively, whereby the said comonomer component a) is selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, allylsulfonic acid, vinylsulfonic acid and a salt thereof or an alkyl or hydroxyalkyl ester. The invention also claims a composition comprising a hydraulic binder such as cement, gypsum, lime and anhydrite and the said copolymer. According to the invention the copolymer can be used as superplasticizer or dispersant for non-hardened (wet) and a hydraulic binder containing compositions.

Abstract: Copolymers include two monomer components, a) an olefinic unsaturated monocarboxylic acid comonomer or an ester or a salt thereof of an olefinic unsaturated sulfuric acid comonomer or a salt thereof, and b) an ether comonomer of the general formula (I) Components a) and b) are present in amounts of from 30 to 90 mol-% and from 70 to 10 mol-%, respectively, and comonomer component a) is selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, allylsulfonic acid, vinylsulfonic acid and a salt thereof or an alkyl or hydroxyalkyl ester. Compositions including a hydraulic binder such as cement, gypsum, lime and anhydrite and the copolymer are also disclosed. The copolymer can be used as superplasticizer or dispersant for non-hardened (wet) and a hydraulic binder containing compositions.

Abstract: The invention relates to the use of water-soluble polymers, consisting of a) monoethylenically unsaturated monomers consisting of acidic groups in an acidic, partially or fully neutralized form and b) other monomers which can be copolymerized with monomers a) as a drying agent for the production of redispersion power and/or powdery polymer dispersing agents. The water-soluble polymers contain at least 20 wt. % monomers (a) and a maximum of 80 wt. % monomers (b) and are supplied to the production process in the form of aqueous solutions in amounts of up to 50 wt. % maximum, enabling powder, polymer products with a residual moisture of <2 wt. % to be obtained, particularly in spray drying processes, and which are added to mineral systems as dispersing agents in amounts of 0.05-5 wt. % or are used as building materials for the mineral binding of redispersion powder in adhesives or as a binders in their own right.

Abstract: The use of a three-component water-soluble polymer comprising 5–90% by weight of a component a), preferably of the maleic acid, fumaric acid or itaconic acid type, 5–90% by weight of a component b) essentially from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, vinylsulfonic acid and vinylphosphonic acid, and 5–90% by weight of a component c) comprising acrylic acid, methacrylic acid, acrylamide or methacrylamide, as fluidizer for refractory compositions comprising alumina cement is described. The copolymer, which has a preferred molecular weight Mw of <50,000, can also be combined with further quality-improving additives such as silica, lime or soda and further customary additives for refractory compositions.

Abstract: Stabilized, water-soluble polymer powders based on polyoxyalkylene glycol carboxylates are described, wherein the powders comprise from 0.01 to 10% by weight of a stabilizer selected from the group consisting of phenols, amines, phosphites, thioethers, and also thioacids, and where the stabilizer was added in liquid or dissolved form to the aqueous polymer solution prior to its conversion into the powder form. The polymer powders thus protected against autoignition and oxidative degradation have unexpectedly high thermooxidative stability, even on exposure to high temperatures and oxidizing action (air, oxygen).

Abstract: A process for the production of sulphonic acid group-containing condensation products based on amino-s-triazines with at least two amino groups and formaldehyde with a low content of free formaldehyde, whereina) an amino-s-triazine, formaldehyde and sulphite is condensed in a mole ratio of 1:1.3 to 6:0.3 to 1.5 in aqueous solution at a pH value of 9.0 to 12.0 and at a temperature of 50.degree. to 90.degree. C. until sulphite is no longer detectable.b) subsequently, further condensation is carried out at a pH value of 2.0 to 7.0 and at a temperature of 50.degree. to 90.degree. C. until the viscosity of the solution is 4 to 1000 mm.sup.2 /s at 80.degree. C. andc) thereafter the condensation product is subjected to an after-treatment in a strongly alkaline range of pH.sqroot.11.0 and at an elevated temperature.

Abstract: The present invention provides a thermostable polymer comprisinga) 16 to 67 mole % of structural components of the formula: ##STR1## b) 5 to 42 mole % of structural components of the formula: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3, independently of one another, are hydrogen atoms or methyl radicals, as well as c) 16 to 46 mole % of structural components of the formula: ##STR3## wherein R.sup.4 is a hydrogen atom or a methyl radical. The present invention also provides a process for the production of these polymers which, because of their high temperature stability, are outstandingly useful as retention agents for aqueous systems and as fluid loss additives.