Basf Aktiengesellschaft

Other

Andreas Stange

Michael Kroener

Claudia Nilz

Heinrich Hartmann

Walter Denzinger

Friedrich Linhart

Rudolf Schuhmacher

Primoz Lorencak

Dietmar Moench

Hans-Juergen Degen

Hubert Meixner

Norbert Mahr

Norbert Sendhoff

Volkmar Weberndoerfer

Martin Rubenacker

Dietmar Monch

Klaus Flory

Franz Merger

Wolfgang Reuther

Rainer Dyllick-Brenzinger

Kevin Ray Anderson

Guenther Seybold

Gerd Rehmer

Anton Esser

Manfred Niessner

Manfred Schwartz

Fritz Graser

Lawrence Edward Fosdick

Sigberg Pfohl

Martin Wendker

Werner Auhorn

Martin R&uuml;benacker

Manfred Winter

Ki-Oh Hwang

Enrique Freudenberg

John Thomas McDonald, Jr

Michael Kroner

Joerg Liebe

Peter Baumann

Heinrich Hartman

Dogan Sahin Sivasligil

Sarah Veelaert

Ellen Kr&uuml;ger

Kurt Diehl

Modifying starch with cationic polymers and use of the modified starches as dry-strength agent

According to the present disclosure, starch/polymer combinations are provided. The preferred starch/polymer combinations are usable as paper additives, in the wet end of a papermaking process. Typical and preferred starch/polymer combinations of this type, result from combining a starch, having a polymer reactive carbonyl functionality, with a polymer, having a carbonyl reactive functionality, under conditions that allow for covalent interaction between the two. Typically usable components comprise oxidized starch and polymer having reactive primary or reactive secondary amine groups. Also provided are methods of preparing such combinations, methods of use, preferred papers including such combinations, and, analytical techniques usable in preparation of such combinations.

Compositions suitable as additives in the paper industry, preparation; use; and, paper comprising such

Paper, board and cardboard having high dry strength are produced by the addition of cationic, anionic and/or amphoteric starch as dry strength agents to the paper stock and drainage of the paper stock with sheet formation in the presence of cationic polymers as retention aids for starch, and cationic polymeric retention aids are used for increasing the retention of dry strength agents comprising cationic, anionic and/or amphoteric starch in the production of paper, board and cardboard.

Method for producing high dry-strength paper, pulpboard and cardboard

Preparation of aqueous solutions of polymers containing vinylamine

Graft polymers of polymers containing vinyl ester and/or vinyl alcohol

Graft polymers comprising polymers, containing alkylene oxide units, and

Cationic modification of starch and use of the cationically modified

Copolymers which are obtained by copolymerization of a) from 5 to 99 mol % of N-vinylcarboxamides, b) from 95 to 1 mol % of monoethylenically unsaturated carboxylic acids and/or the alkali metal, alkaline earth metal, ammonium or amine salts thereof, and if required, c) up to 30 mol % of other monoethylenically unsaturated compounds, and if required, d) up to 2 mol % of crosslinking agents, and subsequent partial or complete elimination of the acyl groups from the N-vinylcarboxamides polymerized in the copolymer, with formation of amino or ammonium groups, are used as additives to paper stock for increasing the drainage rate and the retention in papermaking, and the dry and wet strength of the paper.

Use of hydrolyzed copolymers of N-vinylcarboxamides and

Graft polymers are obtainable by free radical polymerization of

Graft polymers of natural substances containing saccharide structures or

Catonic urea/formaldehyde resins, their preparation and their use in the

Cationic urea/formaldehyde resins are obtainable by condensing urea and formaldehyde in a molar ratio of from 1:1.5 to 1:3 in the presence of polymers which contain not less than 1 mol % of polymerized vinylamine units and have Fikentscher K values of from 5 to 300, in an amount of from 5 to 50 g per mole of urea in the end product, where the mixture is first a) precondensed at a pH of from 8 to 14, then acidified and b) condensed at a pH of from 1 to 5 until gel formation begins, c) then from 0.3 to 1.5 moles of formaldehyde are added per mole of urea used, d) post-condensation is carried out and e) the resin solution is subsequently neutralized. The resins thus obtained are used in papermaking as assistants for increasing the dry and wet strength of paper and result in less dulling of the whiteness of the paper.

Cationic urea/formaldehyde resins, their preparation and their use in

Production of paper, board and cardboard in the presence of copolymers

Bridged, water-soluble copolymers are obtainable by

Bridged, water-soluble copolymers, their preparation and their use

Growing community of inventors

Mannheim, Germany

Andreas Stange