| SNF S.A.S. Patent applications |
| Patent application number | Title | Published |
|---|
| 20100326614 | CATIONIC COPOLYMERS DERIVED FROM ACRYLAMIDES AND USE THEREOF - A cationic copolymers of acrylamide obtained by the Hofmann rearrangement, using an alkali and/or alkaline earth hydroxide and an alkali and/or alkaline earth hypohalide, are provided. The copolymers can be used as strengthening agents for paper and/or coagulants. The copolymers have a desalination coefficient (Cd) higher than 0.6, higher than 0.65, or higher than 0.7. | 12-30-2010 |
| 20100197529 | PROCESS FOR ENHANCED OIL RECOVERY - Method for enhanced oil recovery consisting in introducing into the injection water a solution containing at least one polymer and at least one surfactant, the surfactant/polymer weight ratio being between 1 and 10 and the surfactant concentration in the solution being higher than 100 ppm (parts per million), characterized in that the said polymer contains at least one hydrophobic cationic monomer. | 08-05-2010 |
| 20100186914 | WATER-SOLUBLE POST BRANCHED CATIONIC ACRYLAMIDE POLYMERS AND USE THEREOF - A cationic copolymer is obtained by the Hofmann rearrangement (also referred to as the Hofmann degradation reaction) in aqueous solution in the presence of an alkaline-earth and/or alkali hydroxide and an alkaline-earth and/or alkaline hypohalide, on a base copolymer comprising at least one nonionic monomer selected from the group comprising acrylamide (and/or methacrylamide), N,N-dimethylacrylamide and/or acrylonitrile The copolymer is branched after the Hofmann rearrangement, in the presence of at least one polyfunctional branching agent, and is soluble in water. | 07-29-2010 |
| 20100105976 | Method for treating mineral sludge above ground using polymers - Provided is a method for treating sludge from the mining or mineral industry, including before above-ground spreading, contacting the sludge with a flocculating agent that is a water-soluble, organic polymer having a molecular weight of from 5,000,000 to 25,000,000 g/mol and an anionicity of from 10 to 40 mol %, to produce contacted sludge, wherein the water-soluble organic polymer includes at least one anionic monomer having a carboxylic function or having a sulfonic acid function, at least one non-ionic monomer, and optionally one or more cationic monomers, where the flocculating agent is branched, and has from 0.02 to 2 mol % hydrophobic monomers. | 04-29-2010 |
| 20090277597 | METHOD FOR PRODUCING PAPER AND CARDBOARD - 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—a UL viscosity of between 1.3 and 2.7 cps, preferably between 1.5 and 2.4 cps, and—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. | 11-12-2009 |
| 20090249596 | NOVEL TEXTILE YARN SIZING COMPOSITION - Temporary sizing agent for natural and/or artificial individualized textile fibres comprises a water-soluble homopolymer or copolymer of at least one acrylamide monomer having a molecular weight not less than one million, advantageously more than three millions. | 10-08-2009 |
| 20090050282 | PROCESS FOR THE MANUFACTURE OF PAPER AND BOARD, CORRESPONDING NOVEL RETENTION AND DRAINAGE AIDS, AND PAPER AND BOARD THUS OBTAINED - A process for the manufacture of paper, board or similar products, comprises
| 02-26-2009 |
| 20080196851 | Method of Producing High Dry Strength Paper and Cardboard and Paper and Cardboard Thus Obtained - In a method of producing a sheet of paper and/or cardboard and similar products, prior to the formation of the sheet from a fibrous suspension, at least two dry strength agents are added to the suspension either separately in any order or mixed together and at one or more injection points, namely: a first agent corresponding to a product for Hofmann degradation in solution on a base (co)polymer comprising at least one non-ionic monomer which is selected from the group containing acrylamide and/or methacrylamide, N,N dimethylacrlamide and/or acrylonitrile; and a second agent corresponding to a (co)polymer having an anionic charge density greater than 0.1 meq/g. The Hofmann degradation product comprises an organic polymer produced at a concentration greater than 3.5% by weight, and preferably greater than 4.5% and the first and second agents are each introduced into the pulp suspension at a concentration of between 0.01 and 2% by weight of active polymer material in relation to the dry weight of the pulp suspension. | 08-21-2008 |
