Solenis Technologies, L.p.

Hercules Corporation

Solenis Technologies Cayman, L.p.

Sachin Borkar

Qu-Ming Gu

Kate Marritt Lusvardi

Joseph M Mahoney

Mingxiang Luo

Marc Christopher Putnam

Daniel F Varnell

Richard J Riehle

Cecil Coutinho

Michael James Bluemle

Lawrence J Andermann, Jr

Shantanu Nikam

Marc C Putnam

Provided is a method for the removal of salts and by-products from vinylamine-containing polymers. In particular, the method allows the removal of unwanted salts, by-products, spent initiators and short chain vinylamine-containing polymers while retaining the functional, higher molecular weight polymers that provide for desired product performance.

Membrane separation process for vinylamine-containing polymers

A composition for increasing paper strength includes a dialdehyde-modified polyacrylamide strengthening agent, a water soluble compound that is soluble at about 5 wt % or greater in water at about 25&#xb0; C., and water. The water soluble compound is typically present in a weight amount that is greater than a weight amount of the strengthening agent. The composition is formed by combining the strengthening agent and the water soluble compound in aqueous media to form the composition, wherein on a dry basis the water soluble compound is typically present in a greater amount than the strengthening agent, drying the composition to form a powder or paste that has a water content of less than about 10 weight percent and is stable after storage at about room temperature for about six months, and reconstituting the powder or paste by adding water thereto. The reconstituted composition may then be used to make paper.

Composition and method for increasing wet and dry paper strength

A graft copolymer composition of a vinyl monomer and a functionalized vinylamine-containing base polymer and a method of preparing the graft copolymer. It also relates to a paper product made using the composition as a papermaking additive.

Modified vinylamine containing polymers and their use in papermaking

A method of improving dry strength and/or drainage of a paper or paperboard by adding to a paper or paperboard furnish, a graft copolymer composition of a vinyl monomer and a functionalized vinylamine-containing base polymer graft copolymer.

Modified of improving dry strength and/or drainage of a paper or paperboard

Provided is a method of making paper and paperboard. In particular graft copolymers of vinyl monomers and functionalized vinylamine-containing base polymers by Michael addition are added to a paper furnish. The composition can be used alone or in combination with other additives for use in paper making and to improve paper making processes such as paper dry and wet strength properties.

Modified vinylamine-containing polymers and their use in papermaking

Stable, coating compositions are disclosed. The compositions comprise an aqueous solution of cationic polymer, starch, and a stabilizing agent. Method of using the coating composition to improve the dry strength of paper is also disclosed.

Surface application of polymers to improve paper strength

Surfactant mediated, free radical initiated emulsion/dispersion polymerization of n-vinylformamide with styrene or substituted styrene copolymers, and its subsequently hydrolyzed products bearing formamide, amine and styrenic functionality are disclosed. Processes for polymerization, polymer composition, and hydrolysis of such polymers are also disclosed. These polymers bearing cationic functionality can be used in papermaking applications as dry strength additives, wet strength additives, retention aids, drainage aids, sizing agent, sizing promoter and pitch and stickies control agents.

Vinylamine containing copolymer microparticles as additives in papermaking

Stable, coating compositions useful for enhancing the dry strength of paper are disclosed. The compositions comprise an aqueous solution of nearly neutral polymer, cationic polymer and starch. Method of using the coating composition to improve the dry strength of paper is also disclosed.

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Wilmington, DE, United States of America

Sachin Borkar