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Jehn-Rendu
Christian Jehn-Rendu, Saint Marcellin En Forez FR
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Christian Jehn-Rendu, Cedex 01 FR
| Patent application number | Description | Published |
|---|---|---|
| 20090283232 | PAPER AND PAPERBOARD PRODUCTION PROCESS AND CORRESPONDING NOVEL RETENTION AND DRAINAGE AIDS, AND PAPERS AND PAPERBOARDS THUS OBTAINED - The invention concerns an improved method for making paper, which uses a branched polymer prepared in invert emulsion as the main retention agent, and bentonite as a secondary retention agent (dual type system). The two additions are separated by a step for shearing the fibrous suspension (or mass). The invention results in highly improved retention and also highly improved dewatering. Moreover, it enables the bentonite content in white water to be reduced. | 11-19-2009 |
Christian Jehn-Rendu, Saint Just Saint Rambert FR
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Christian Jehn-Rendu, Eppelheim DE
| Patent application number | Description | Published |
|---|---|---|
| 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 |
| 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 |
| 20110132559 | PROCESS FOR INCREASING THE DRY STRENGTH OF PAPER, BOARD AND CARDBOARD - Process for the production of paper, board and cardboard having high dry strength by addition of at least one water-soluble (a) polymer comprising vinylamine units and at least one (b) polymer comprising ethylenimine units and at least one water-soluble polymeric anionic compound to a paper stock, draining of the paper stock with sheet formation and drying of the paper products, the water-soluble cationic polymers (a) and (b) being metered in any sequence or as a mixture into a paper stock, and papers which are obtainable by this process. | 06-09-2011 |
Christian Jehn-Rendu, Shanghai CN
| Patent application number | Description | Published |
|---|---|---|
| 20110290434 | PULP COMPOSITION FOR PAPER AND SOLID BOARD PRODUCTION - The present invention relates to a novel pulp composition for paper or solid board production comprising an oxidized recovered paper pulp and/or an oxidized mechanical pulp into which from 1 to 500 mmol of carboxyl groups per kg and from 1 to 200 mmol of aldehyde groups per kg have been introduced by oxidation. The invention also relates to paper and solid board based on such a pulp composition and also to a process for producing such paper or solid board. The invention also relates to the use of oxidized recovered paper pulp and/or oxidized mechanical pulp for improving the retention and drainage properties of a pulp suitable for producing paper or solid board. The invention further relates to the use of oxidized recovered paper pulp and/or oxidized mechanical pulp for improving, i.e., increasing, the dry strength of paper and solid board. | 12-01-2011 |
Christina Jehn-Rendu, Shanghai CN
| Patent application number | Description | Published |
|---|---|---|
| 20110168344 | METHOD FOR MANUFACTURING PAPER, CARDBOARD AND PAPERBOARD USING ENDO-BETA-1,4-GLUCANASES AS DEWATERING MEANS - A process for the production of paper, board and cardboard by draining a paper stock on a wire in the presence of at least one cationic polymeric retention aid and/or retention aid system with sheet formation and drying of the sheets, wherein an endo-β-1,4-glucanase is metered in an amount of from 0.00001 to 0.01% by weight, based on the dry paper stock, into the paper stock before the addition of the at least one cationic polymeric retention aid and/or retention aid system. | 07-14-2011 |
Fabienne Jehn-Rendu, Saint Just Saint Rambert FR
| Patent application number | Description | Published |
|---|---|---|
| 20110124783 | THICKENING AGENTS - Invert water-in-silicone emulsions and a process of production thereof are disclosed. The invert water-in-silicone emulsion is based on polymerizing or copolymerizing one of an ionic, anionic, and/or cationic monomer, or a non-ionic monomer in the presence of a cross-linking agent and transfer agent. The emulsion comprises: a continuous phase having at least one silicone-type oil, and at least two surfactants, at least one of which is a water-in-silicone-type silicone emulsifier and at least one of which is an inversion agent. | 05-26-2011 |