Abstract: The invention concerns the field of aqueous dispersions. It concerns in particular an aqueous dispersion based on structured polymer comprising at least two phases, one called soft with low Tg and the other called hard with high Tg. The invention also concerns the use of such dispersions, as binder in formulation for paints free of solvents or coalescent agents.

Abstract: A water-redispersible powder composition comprising: at least a water-soluble film forming polymer, the polymer being prepared from at least an ethylenically unsaturated monomer; and at least a naphthalenesulphonate.

Abstract: The invention discloses a new phosphomagnesium cement that can be obtained by contacting at least one phosphorus compound and at least one magnesium compound based binder phase, with at least one polymer in water insoluble particle form, and water. The polymer can be selected among those derived from the polymerisation of at least one ethylenically unsaturated monomer and at least one monomer selected among monomers with carboxylic function and acrylamide or methacrylamide. The phosphomagnesium cement can also comprise an aminoalkylsilane, preferably an aminoalkyl(alkoxysilane).

Abstract: A water-redispersible powder composition comprising (a) 100 parts by weight of a powder consisting of a water-insoluble film-forming polymer prepared from at least one ethylenically unsaturated monomer and at least one monomer selected from monomers having a carboxylic function and acrylamide or methacrylamide, and (b) 2-40 parts by weight and preferably 8-22 parts by weight of at least one amino acid or a salt thereof. A method for preparing said composition and the use thereof are also disclosed.

Abstract: The present invention relates to water-redispersible pulverulent composition comprising:a powder of at least one water-insoluble film-forming polymer prepared from at least one ethylenically unsaturated monomer,at least one nonionic surfactant chosen from the polyoxyalkylenated derivatives,at least one water-soluble compound chosen from polyelectrolytes belonging to the family of weak polyacids.

Abstract: Water-dispersible, storage-stable pulverulent compositions of matter, well adopted as adjuvants for hydraulic binders used in the construction industry, comprise particulates of a water-insoluble film-forming vinyl and/or acrylic polymer, e.g., a vinyl ester, alkyl(meth)acrylate or vinylaromatic homopolymer or copolymer, containing from 0.5 to 20 parts by weight of at least one silicone, e.g., an alkali or alkaline earth metal organosiliconate or a liquid organopolysiloxane, per 100 parts by weight of such film-forming polymer.

Abstract: A fine powder of stabilized zirconia a process for its preparation and application of the powder in ceramic compositions to obtain good mechanical, thermomechanical and electrical properties.A zirconia hydrate sol having a pH between 0.5 and 5 and containing elementary acicular crystals having dimensions of from about 10 to 500 .ANG. which are agglomerated into submicron aggregates of from abuot 100 to 5000 .ANG. in diameter is mixed with a solution of a stabilizing agent, preferably yttrium; the suspension is dried; the dried suspension is calcined at a temperature of from about 700.degree. C. to 1,300.degree. C. for preferably from about 30 minutes to 24 hours; and if needed, the powder obtained is milled.

Abstract: Submicronic zirconia particulates containing stabilizing amounts of yttrium or cerium, well adapted for ceramics applications, are produced by (i) admixing an aqueous suspension of zirconium fluosulfate particles having a pH of from about 0 to 3 with an aqueous solution of a salt of yttrium or cerium, (ii) neutralizing the resulting mixture at a pH of at least 7, (iii) separating a mixture of zirconium/yttrium or zirconium/cerium hydroxides from the medium of neutralization, (iv) washing said mixture of hydroxides to eliminate sulfate and fluoride ions therefrom, and then (v) calcining said mixture of hydroxides.

Abstract: A fine powder of neodymium titanate or barium neodymium titanate, a process for its preparation and applications in ceramic compositions. A suspension of particles is formed by mixing a solution of neodymium nitrate or a solution of barium and neodymium nitrates with a sol of titania having a pH of from about 0.8 to 2.5 which contains elementary crystallites of TiO.sub.2 having a size of from about 10 to about 100 .ANG. in diameter which are agglomerated into submicron masses of from about 200 to about 1,000 .ANG. in diameter. The suspension obtained is dried, and the dried product is calcined at a temperature between 800.degree. C. and 1,300.degree. C., preferably for about 1 to 24 hours. If necessary, the powder obtained is milled. The fine powder obtained has a low fritting temperature and its density after heating for 2 hours at 1,300.degree. C. is greater than or equal to 95% of the theoretical density of the desired titanate powder.

Abstract: Finely divided powders of alkaline earth metal titanates, well suited for the fabrication of, e.g., ceramic resistors and condensers, are facilely prepared by (i) admixing a solution of an alkaline earth metal nitrate with a titanium sol having a pH ranging from 0.8 to 2.5 and which comprises elementary crystallites of TiO.sub.2 having particle sizes ranging from 10 to 100 .ANG., agglomerated into submicronic masses having particle sizes ranging from 200 to 1000 .ANG., (ii) next drying the suspension which results, (iii) calcining said dried suspension at a temperature ranging from 700.degree. to 1300.degree. C. for from 30 minutes to 24 hours, under a NO.sub.x partial pressure decreasing from 1 to 0, and then (iv) optionally grinding the powder resulting from said step (iii).