S.p.c.m. Sa

Snf Group

Snf S.a.s.

Gatien Faucher

Damien Fougerouse

René Hund

Cyril Barriere

Christian Jehn-Rendu

Damien Fougerousse

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,

Process for manufacturing paper and board

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.

Complexes of water-soluble polymers, and uses thereof

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.

Process for manufacturing paper and board having improved retention and drainage properties

A method for producing paper, cardboard or similar materials, comprising, separately or in a mixture, adding to a fibrous suspension: at least one main retention agent comprising a cationic (co)polymer, and at least one dual retention agent comprising a crosslinked cationic (co)polymer obtained in the form of a dispersion and placed in solution prior to its introduction into the fibrous suspension with gentle stirring. The crosslinked cationic (co)polymer having&#x2014;a UL viscosity of between 1.3 and 2.7 cps, preferably between 1.5 and 2.4 cps, and&#x2014;an apparent cationicity ratio of between 25 and 75%. Optionally, before or after the dual agent or the main retention agent are added, one or more tertiary retention agent(s) selected from the group comprising mineral particles and organic polymers carrying anionic charges, is added to the suspension.

Method for producing paper and cardboard

A process for the manufacture of paper, board or similar products, comprises Subsequently there is added to the suspension, separately or as a mixture, in any order:

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Saint Etienne, France

Gatien Faucher