Basf Se Corporation

Ciba Specialty Chemicals Corporation

Solenis Technologies Cayman, L.p.

Matthew D Wright

The present disclosure is directed to a continuous process for preparing cellulose reactive adducts of polyvinylamide.

Preparation of polyvinylamide cellulose reactive adducts

A cellulose reactive glyoxalated copolymer composition and methods of producing and using the glyoxalated copolymer composition to, for instance, strengthen paper or board are discussed. A glyoxalated copolymer composition includes an aqueous medium containing a glyoxalated copolymer, wherein the glyoxalated copolymer is obtained by reaction in an aqueous reaction medium of a dry weight ratio of glyoxalxationic copolymer. The cationic copolymer can have a weight average molecular weight of about 120,000 to about 1 million Daltons, the cationic copolymer can include diallyldimethylammonium halide monomer and acrylamide monomer, and a ratio a ratio of the weight average molecular weight of the cationic copolymer before glyoxalation to weight % of diallyldimethylammonium halide monomer making up the cationic copolymer before glyoxalation can be equal to or greater than 4,000 or range from 4,000 to 40,000 Daltons/weight %.

High molecular weight and high cationic charge glyoxalated polyacrylamide copolymers and their methods of manufacture and use

The present invention is directed to a method for preparing a cellulose reactive adduct of polyvinylamide and a composition resulting from the method. The preparation of the cellulose reactive adduct is carried out close to a Critical Concentration defined herein. When the reaction is run close to this Critical Concentration, the risk of gelation is minimized, consumed glyoxal is maximized, and shelf live is enhanced. Additionally, the glyoxalated vinylamides of the present invention impart improved wet and dry strengthening efficiency to paper and paperboard when compared to adducts disclosed in previously described art.

Glyoxalation of vinylamide polymer

The present invention is directed to compositions comprising a cellulose reactive functionalized polyvinylamine first adduct, compositions comprising combinations of the cellulose reactive functionalized polyvinylamine first adduct and cellulose reactive functionalized polyvinylamide second adduct, methods for preparing first adduct and second adduct blends and finally methods of increasing the wet or dry strength of paper by incorporation into the paper furnish or coating a paper or board with said adducts.

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Plover, WI, United States of America

Matthew D Wright