Abstract: The present invention relates to a novel anionic water-soluble polymer, to the method for the preparation thereof and to the use thereof, notably in the paper field.

Abstract: This invention relates to a new polyvinylamine polymer, its preparation method and use, specifically for application in the field of paper manufacturing.

Abstract: The present invention relates to a novel anionic water-soluble polymer, to the method for the preparation thereof and to the use thereof, notably in the paper field.

Abstract: This invention relates to a new water-soluble dialdehyde-functionalized polymer its preparation method and use, notably for application in the field of paper or cardboard manufacturing.

Abstract: This invention relates to a new polyvinylamine polymer, its preparation method and use, specifically for application in the field of paper manufacturing.

Abstract: This invention relates to a method for manufacturing a sheet of paper or cardboard, comprising the addition of a water-soluble polymer P with a weight-average molecular weight greater than 750,000 Dalton to a fibrous suspension. This method comprises the following successive steps: preparing an aqueous solution A containing at least one water-soluble polymer P at a concentration C of between 0.1 and 0.5% by weight, said polymer P having a factor F(C) strictly greater than 4, with F(C)=?600/C, ?600 being the slope to reach 90% of the viscosity developed by aqueous solution A at 600 seconds at 25° C., obtained from the viscosity curve of aqueous solution A as a function of time, at the given concentration C, at 25° C., adding aqueous solution A to the fibrous suspension, at one or more injection points, forming a sheet of paper or cardboard.

Abstract: A method for producing a sheet of paper or cardboard from a fibrous suspension, includes injection of a polymer P2 into a fibrous suspension, forming of a sheet of paper or cardboard, and drying the sheet of paper or cardboard. The polymer P2 is prepared, before injection of the polymer P2, from a water-soluble polymer P1 in the form of solid particles. Polymer P1 consists of at least one nonionic monomer selected from acrylamide, methacrylamide, N,N-dimethylacrylamide, and acrylonitrile. Polymer P1 is subjected to a reaction Re to yield polymer P2. The reaction Re includes the addition and the dissolution of solid particles of polymer P1 in an aqueous solution M1 of an alkali hydroxide and/or an alkaline earth hydroxide, and an alkali hypohalide and/or an alkaline earth hypohalide, prior to a reaction time of 10 seconds to 5 hours.

Abstract: A method for producing a sheet of paper or cardboard from a fibrous suspension includes injection of a polymer P2 into a suspension of cellulosic fibers, forming of a sheet of paper or cardboard, and drying of the sheet of paper or cardboard. The polymer P2 is prepared, before the injection, from a water-soluble polymer P1 in inverse emulsion form. P1 consists of at least one nonionic monomer selected from acrylamide, methacrylamide, N,N-dimethylacrylamide, and acrylonitrile. The polymer P1 is subjected to a reaction Re to yield a polymer P2. The reaction Re includes adding the polymer P1 in inverse emulsion form to an aqueous solution M1 of an alkali hydroxide and/or an alkaline earth hydroxide, and an alkali hypohalide and/or an alkaline earth hypohalide, prior to a reaction time of 10 seconds to 5 hours.

Abstract: This method for treating the surface of paper and/or one of the layers thereof, comprises the following successive steps: i) Supplying an aqueous suspension S of polysaccharide; ii) Supplying an aqueous dispersion D comprising (a) particles of at least one anionic water-swellable polymer P and (b) at least one compound selected from a mineral salt, an organic salt, an organic dispersing polymer and the mixtures thereof; iii) Mixing the suspension S and the dispersion D to obtain a mixture M; iv) Applying the mixture M to the surface of the paper and/or to at least one of the layers thereof.

Abstract: This invention relates to a method for manufacturing a sheet of paper or cardboard, comprising the addition of a water-soluble polymer P with a weight-average molecular weight greater than 750,000 Dalton to a fibrous suspension. This method comprises the following successive steps: preparing an aqueous solution A containing at least one water-soluble polymer P at a concentration C of between 0.1 and 0.5% by weight, said polymer P having a factor F(C) strictly greater than 4, with F(C)=?600/C, ?600 being the slope to reach 90% of the viscosity developed by aqueous solution A at 600 seconds at 25° C., obtained from the viscosity curve of aqueous solution A as a function of time, at the given concentration C, at 25° C., adding aqueous solution A to the fibrous suspension, at one or more injection points, forming a sheet of paper or cardboard.

Abstract: The present invention relates to a polymer complex obtained by inverse emulsion polymerization of water-soluble monomers: in the presence of a cationic water-soluble host polymer comprising amine functions.

Abstract: This invention relates to an additive based on (co)polymers resulting from the reaction between at least one dialdehyde compound and at least one complex (co)polymer obtained by polymerization of water-soluble monomers in the presence of at least one host (co)polymer comprising vinylamine functions.

Abstract: The present invention relates to a complex of polymers and to the use thereof in a method of making paper, cardboard or the like. This complex of polymers is obtained by polymerizing water-soluble monomers: in the presence of a host polymer that comprises vinylamine functions and of a non-polymeric transfer agent, and in the absence of a branching or crosslinking agent of the ethylenic polyfunctional type. It is obtained as from a mass ratio of anionic monomer to water that is greater than 0.035.

Abstract: This method for treating the surface of paper and/or one of the layers thereof, comprises the following successive steps: i) Supplying an aqueous suspension S of polysaccharide; ii) Supplying an aqueous dispersion D comprising (a) particles of at least one anionic water-swellable polymer P and (b) at least one compound selected from a mineral salt, an organic salt, an organic dispersing polymer and the mixtures thereof; iii) Mixing the suspension S and the dispersion D to obtain a mixture M; iv) Applying the mixture M to the surface of the paper and/or to at least one of the layers thereof.

Abstract: The present invention relates to a complex of polymers and to the use thereof in a method of making paper, cardboard or the like. This complex of polymers is obtained by polymerizing water-soluble monomers: in the presence of a host polymer that comprises vinylamine functions and of a non-polymeric transfer agent, and in the absence of a branching or crosslinking agent of the ethylenic polyfunctional type. It is obtained as from a mass ratio of anionic monomer to water that is greater than 0.035.

Abstract: This invention relates to an additive based on (co)polymers resulting from the reaction between at least one dialdehyde compound and at least one complex (co)polymer obtained by polymerization of water-soluble monomers in the presence of at least one host (co)polymer comprising vinylamine functions.

Abstract: The present invention relates to a process for manufacturing a sheet of paper and/or board from a fibrous suspension, according to which, before the formation of said sheet, added to the fibrous suspension, at one or more injection points, are at least two retention aids respectively: (a) at least one water-soluble organic cationic polymer P1 having a cationicity greater than 2 meq·g?1, and (b) at least one water-soluble amphoteric polymer P2 of at least one anionic monomer and of at least one cationic monomer. The polymer P2 is added to the fibrous suspension after dissolving, in aqueous solution, the polymer P2 previously obtained by one of the following polymerization techniques: gel polymerization, suspension polymerization, inverse emulsion polymerization, dispersion polymerization. The polymer P2 has a factor F>2, said factor F being defined by the formula: F=UL2×[(100?A)/(100?C)] with UL: Brookfield viscosity of the polymer P2 at 0.

Abstract: The present invention relates to a process for manufacturing a sheet of paper and/or board from a fibrous suspension, according to which, before the formation of said sheet, added to the fibrous suspension, at one or more injection points, are at least two retention aids respectively: (a) at least one water-soluble organic cationic polymer P1 having a cationicity greater than 2 meq·g?1, and (b) at least one water-soluble amphoteric polymer P2 of at least one anionic monomer and of at least one cationic monomer. The polymer P2 is added to the fibrous suspension after dissolving, in aqueous solution, the polymer P2 previously obtained by one of the following polymerization techniques: gel polymerization, suspension polymerization, inverse emulsion polymerization, dispersion polymerization. The polymer P2 has a factor F>2, said factor F being defined by the formula: F=UL2×[(100?A)/(100?C)] with UL: Brookfield viscosity of the polymer P2 at 0.

Abstract: Polymer complex obtained by polymerization of water-soluble monomers: in the presence of a host polymer comprising vinylamine functions and of a non-polymeric transfer agent, and in the absence of branching or crosslinking agent of ethylenic polyfunctional type.

Abstract: A method for manufacturing a sheet of paper and/or board having improved retention and drainage properties is provided, according to which, before the formation of the sheet and/or board, at least two retention aids are added to the fibrous suspension. These two retention aids are a main retention aid corresponding to a (co)polymer having a cationic charge density above 2 meq/g, obtained by the Hofmann degradation reaction, and a secondary retention aid corresponding to a water-soluble or water-swellable polymer having an anionic charge density above 0.1 meq/g. The main retention aid is introduced into the fibrous suspension in a proportion of 100 to 800 g/t of dry pulp, and the secondary retention aid is introduced into the fibrous suspension in a proportion of 50 to 800 g/t of dry pulp and has an intrinsic viscosity IV above 3 dl/g.