Hercules Corporation

Solenis Technologies, L.p.

Mark T Crisp

Richard J Riehle

Huai Nan Cheng

Harold Jabloner

Anthony J Allen

Ronald Busink

John Arthur Lapre

John James Hoglen

Ashley Hawkins Lewis

Francis J Carlin, Jr

Michaela Hofbauer

Alfred Jacques Haandrikman

Jeffrey H Peltier

Michael A Evans

Bryan K Spraul

Jeffrey Hubert Peltier

Ashley H Lewis

Richard James Riehle

A process is disclosed for making paper having improved filler retention and opacity. The process includes the step of adding Additive A and Additive B to a slurry in a wet end of a paper machine wherein the slurry comprises pulp and a filler. Additive A is a wet strength agent. Additive B is an anionic polymer having a charge density from about &#x2212;3000 to about &#x2212;7000 ueq/g on a dry basis when measured in a buffer having a pH of about 6. Additive B also has a weight average molecular weight of from about 150,000 to about 1,000,000, Daltons.

Process for making paper with improved filler retention and opacity while maintaining wet tensile strength

Provided is a process for improving the performance of wet-strength resins, such as polyaminopolyamide-epichlorohydrin resins, by treatment with a base to increase molecular weight to provide improved wet strength.

Process to improve performance of wet-strength resins through base activation

Processes for rendering a polyamine-epihalohydrin resin storage stable, including processes that prepare a storage stable resin and/or processes that treat resins. A composition containing a polyamine-epihalohydrin resin which includes CPD-forming species can be treated with at least one agent under conditions to at least one of inhibit, reduce and remove the CPD-forming species to obtain a reduced CPD-forming resin so that a composition containing the reduced CPD-forming polyamine-epihalohydrin resin when stored for 2 weeks at 50&#xb0; C., and a pH of about 2.5 to 3.5 contains less than about 250 ppm dry basis of CPD. The invention is also directed to a gelation storage stable reduced CPD-forming resin so that a composition containing the reduced CPD-forming polyamine-epihalohydrin resin, when stored at pH 1 for 24 hours at 50&#xb0; C. and measured at 24 hours, produces less than about 1000 ppm dry basis of CPD. A paper product containing the storage stable polyaminopolyamide-epihalohydrin resin, when corrected for adding at about a 1 wt % addition level of the polyaminopolyamide-epihalohydrin resin, contains less than about 250 ppb of CPD. Moreover, a resin can be prepared starting from a prepolymer having a low acid number or low concentration of acid end groups. The invention is also directed to papers containing the resins.

Reduced by product polyamine-epihalohydrin resins

Processes for rendering a polyamine-epihalohydrin resin storage stable, including processes that prepare a storage stable resin and/or processes that treat resins. A composition containing a polyamine-epihalohydrin resin which includes CPD-forming species can be treated with at least one agent under conditions to at least one of inhibit, reduce and remove the CPD-forming species to obtain a reduced CPD-forming resin so that a composition containing the reduced CPD-forming polyamine-epihalohydrin resin when stored for 2 weeks at 50&deg; C., and a pH of about 2.5 to 3.5 contains less than about 250 ppm dry basis of CPD. The invention is also directed to a gelation storage stable reduced CPD-forming resin so that a composition containing the reduced CPD-forming polyamine-epihalohydrin resin, when stored at pH 1 for 24 hours at 50&deg; C. and measured at 24 hours, produces less than about 1000 ppm dry basis of CPD. A paper product containing the storage stable polyaminopolyamide-epihalohydrin resin, when corrected for adding at about a 1 wt % addition level of the polyaminopolyamide-epihalohydrin resin, contains less than about 250 ppb of CPD. Moreover, a resin can be prepared starting from a prepolymer having a low acid number or low concentration of acid end groups. The invention is also directed to papers containing the resins.

Reduced byproduct polyamine-epihalohydrin resins

This invention relates to resins useful for imparting dry-strength and temporary wet-strength to paper, the process of incorporating these resins into paper and the paper produced containing the resins. The resin comprises an amphoteric polymer produced through polymerization of an anionic monomer, a monomer containing aldehyde functionality and a cationic monomer.

Resins of amphoteric aldehyde polymers and use of said resins as temporary wet-strength or dry-strength resins for paper

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Amersfoort, Netherlands

Mark T Crisp