Abstract: The invention relates to an aqueous insolubilizer composition intended for the surface treatment of paper and cardboard, comprising a mixture composed of glyoxal and of at least one alkali metal orthophosphate, and also its use.

Abstract: The invention relates to an aqueous insolubilizer composition intended for the surface treatment of paper and cardboard, comprising a mixture composed of glyoxal and of at least one alkali metal orthophosphate, and also its use.

Abstract: The invention relates to an aqueous composition comprising a carbonate of zirconium and of an alkali metal salt, prepared from a zirconium compound and an alkali metal bicarbonate, and an ammonium halide, and to its use as insolubilizing agent in a coating bath for paper or board.

Abstract: The invention relates to an aqueous composition comprising a carbonate of zirconium and of an alkali metal salt, prepared from a zirconium compound and an alkali metal bicarbonate, and an ammonium halide, and to its use as insolubilizing agent in a coating bath for paper or board.

Abstract: The invention relates to a process for the preparation of an aqueous composition of zirconium carbonate and an alkali metal salt in which a zirconium compound and an alkali metal bicarbonate are reacted, in the aqueous phase, with a bicarbonate to zirconium molar ratio equal to or greater than 4:1. The invention also relates to the use of the said aqueous composition of zirconium carbonate and an alkali metal salt as insolubilizing agent in a coating bath for paper or board.

Abstract: The invention relates to an aqueous insolubilizer composition intended for the surface treatment of paper and cardboard, comprising a mixture composed of glyoxal and of at least one alkali metal orthophosphate, and also its use.

Abstract: Compositions intended for the treatment of paper and cardboard surfaces characterized in that they have a pH of less than 6 and contain between 30 and 50% by weight of a mixture constituted by glyoxal (G), urea (U), an alkali metal salt of an oxygenated boron acid (A) and calcium hydroxide (D) in the following molar ratios ##EQU1## coating baths containing this composition and treated papers.

Abstract: Cationic copolymers which are insoluble in water based on acrylamide, and a cationic monomer of general formula (I) ##STR1## in which R and R.sub.1, identical or different, represent a hydrogen atom or a methyl group, X represents an oxygen atom or an NH radical and n represents 2 or 3, containing in molar proportions 5 to 30% of cation units and cross-linked with 0.01% to 0.4% in molar proportions relative to the previous monomers of bisacrylamidoacetic acid and with about 0.01% to 0.1% in molar proportions relative to the monomers of bisacrylamidoacetic acid, self-reversible dispersions containing them and use in coating in the paper industry.

Abstract: Process for coating papers and other articles in which the said papers and other articles are treated at pH 4 to 5 with a cross-linked anionic polymer, insoluble in water, and use for obtaining papers or other similar articles intended to be flexographically printed.

Abstract: Cationic copolymers which are insoluble in water based on acrylamide, and a cationic monomer of general formula (I) ##STR1## in which R and R.sub.1, identical or different, represent a hydrogen atom or a methyl group, X represents an oxygen atom or an NH radical and n represents 2 or 3, containing in molar proportions 5 to 30% of cation units and cross-linked with 0.01% to 0.4% in molar proportions relative to the previous monomers of bisacrylamidoacetic acid and with about 0.01% to 0.1% in molar proportions relative to the monomers of bisacrylamidoacetic acid, self-reversible dispersions containing them and use in coating in the paper industry.

Abstract: Process for coating papers and other articles in which the said papers and other articles are treated at pH 4 to 5 with a cross-linked anionic polymer, insoluble in water, and use for obtaining papers or other similar articles intended to be flexographically printed.

Abstract: A refining process for paper pulp in which colloidal silica sol is mixed with the paper pulp to be refined. The addition of the colloidal silica sol reduces the time necessary to refine the pulp to a predetermined freeness value compared to refining in the absence of the colloidal silica sol.

Abstract: Coating process for papers and cardboards, in which cross-linked polymers insoluble in water, containing in molar proportions in the polymerized state:50 to 99.995% acrylic acid at least 70% of which is in the form of ammonium acrylate,0.005 to 0.5% bisacrylamidoacetic acid which has about the same neutralization ratio as acrylic acid and,the complement to 100% with acrylamide, are used as coating agent, and use in paper coating.

Abstract: The invention relates to stable water in oil dispersions, of hydrosoluble cationic polymers based on salified or quaternized dimethylaminoethyl acrylate copolymerized or not with acrylamide, and containing more than 5%(in moles) of cationic units uniformly and not statistically distributed along the chains, presenting a composition by weight of from 20 to 55% of polymers, from 20 to 45% of oil, from 1 to 5% of at least two emulsifying agents, and the balance to 100% being water, the oil phase being a mixture of normal C.sub.10 -C.sub.13 alkanes, one of the emulsifying agents having an HLB of 3 to 5, and good solubility in the oil phase, and a lipophilous group of a carbonated ramified chain of at least 16C and the other having an average HLB of 12 to 16, the percentages by weight of both agents being from 0.5 to 3% relative to the weight of the dispersion.

Abstract: A novel cationic aminoplastic water-dispersible resin based on melamine, formaldehyde and glyoxal salified by a mineral or organic protonic acid, or by a mixture of such acids, selected from the group comprising hydrochloric, nitric, orthophosphoric, acetic, formic acids; it contains molar ratios, for 1 mole of melamine, of 2 to 4 moles of formaldehyde, 0.1 to 3 moles of glyoxal and 0.5 to 1 mole of mineral or organic protonic acid, or the equivalent quantity of a mixture thereof.

Abstract: Strong cationic polyelectrolytes in powder form based on acrylamide and quaternized or salified dimethylaminoethyl acrylate; and the use thereof for flocculation of solid material suspensions and coalescence of emulsions.Such polyelectrolytes contain in molar proportions more than 50% of cationic units uniformly distributed along the copolymer chains. They are used for flocculating colloidal suspensions and/or coalescing emulsions, especially, in sewage water purification installations.

Abstract: Cationic polyelectrolytes in water-soluble powder form, applicable to the flocculation of municipal sludge comprise copolymers of acrylamide and of quaternized or salified dimethylamino-ethyl acrylate, containing in molar proportions 10 to 50% of cationic units distributed regularly along the copolymer chains. They have an intrinsic viscosity higher than 6 and a measured cationicity higher than 90% of the theoretical cationicity.