Snf Group

S.p.c.m. Sa

Damien Fougerouse

Gatien Faucher

René Hund

Cyril Barriere

Bastien Martel

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.

Polymer and its preparation method

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.

Polymer and method for the preparation thereof

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

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:

Method for manufacturing paper and cardboard

This method for treating the surface of paper and/or one of the layers thereof, comprises the following successive steps:

Increasing paper strength by surface treatment

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.

Additive based on water-soluble polymers and uses thereof

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.

Complex of polymers, preparation and use

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: 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: The polymer P2 has a factor F&#x3e;2,

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Andrezieux Boutheon, France

Damien Fougerouse