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: Sulfonated condensation products that are stable in storage and have increased thermal stability are based on aminoplastic formers having at least two amino groups or naphthalene and formaldehyde and, optionally include organic nitrogen bases which additionally contain, as nitrogenous formulation auxiliary agents, compounds of general formula (I) R1—NH—X—Y—R2, wherein R1 and R2 independently represent H, —CH3, —C2H5, —C3H7, —(CH2)n—CH2—; X?—CH2, CO, CS; Y?S, NH, —(CH2)m—; n=0 to 9; m=1 to 4; and/or compounds of general formula (II), wherein Z?—OCH3, —SO3—H, —SO3Na+, —NO2, —NH2, —NH—NH2, —CO2—Na+, —CHO. The mole ratio of aminoplastic formers: formaldehyde: sulfite: nitrogenous formulation auxiliary agents rangin from 1:1.9 to 6.0:1.0 to 2.0:0.01 to 1.5 and/or the mole ratio of naphthalene sulfonic acid: formaldehyde; nitrogenous formulation auxiliary agents equals 1:0.7 to 3.0:0.01 to 1.5. Method for preparing these condensation products of using them, e.g.

Abstract: This polymeric, acrylamide-free water retention agent, intended inter alia for drilling fluids in the high-temperature range and based on vinylic sulfonic acids, may be composed of the two principal components A and B, component A being selected from the group a) consisting of vinylic substituted sulfonic acid of the series 2-acrylamido-2-methylpropanesulfonic acid (AMPS), vinylsulfonic acid, methallylsulfonic acid or styrenesulfonic acid, salts thereof with a valence of at least 1, or mixtures thereof, or b) a divalent salt of homopolymers or copolymers of a vinylic substituted sulfonic acid of the series 2-acrylamido-2-methylpropanesulfonic acid (AMPS), vinylsulfonic acid, methallylsulfonic acid or styrenesultonic acid or mixtures thereof. In the case where component A comprises group a), the polymer further comprises component B) composed of a) from 4.99 to 60 mol % of an unsaturated, polybasic, cis-positioned carboxylic acid monomer and b) from 0.

Abstract: In the proposed condensation product based on amino-s-triazines with at least two amino groups, formaldehyde and sulphite, the molar ratio of amino-s-triazine, formaldehyde and sulphite is 1:2.5-6.0:1.51-2.0 and the formiate content is less than 0.3 wt %. The condensation product is obtained by a) heating amino-s-triazine, formaldehyde and a sulphite in the molar ratio 1:2.5-6.0:1.51-2.0 in an aqueous solution at a temperature of 60-90° C. and a pH level of between 9.0 and 13.0 until the sulphite can no longer be detected; b) continuing the condensation at a pH level of between 3.0 and 6.5 and a temperature of 60-80° C. until the condensation product has a viscosity of 5-50 mm/s at 80° C.; and c) adjusting the pH level of the condensation product to 7.5-12.0 or carrying out thermal secondary treatment at a pH level of >10.0 and a temperature of 60-100° C. The product can be used as an additive for inorganic binders such as cement.

Abstract: A method for the rheology control of fluid phases, in which adducts which contain layered mixed metal hydroxides (MMH) and hectorite are used, and corresponding compositions for this purpose are claimed. Preferably used MMH are those which were produced by hydration of mixed metal oxides or oxyhydroxides, which in turn may be thermally activated. The use of coprecipitated MMH or of MMH produced in situ is also possible. The ratio of MMH to the hectorite component should preferably be from 0.05 to 0.2:1, it also being possible to use adducts whose clay fraction contains up to 80%. by weight of clays differing from hectorite, in particular bentonite. The method is preferably carried out using drilling fluids in the high-temperature range >300° F. (>149° C.).

Abstract: Terpolymers based on (meth)acrylamide, hydroxyalkyl (meth)acrylate and sulfobetaine monomers and their use as thickeners for aqueous salt solutions are described. The terpolymers display their thickening effect within wide concentration and density ranges of the aqueous salt solutions. In addition, their thermal stability is retained also with respect to salt solutions containing calcium chloride and/or calcium bromide and/or zinc bromide.