Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2007-02-13
2007-02-13
Buttner, David J. (Department: 1712)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S164600, C435S262000, C435S262500, C524S017000
Reexamination Certificate
active
10396155
ABSTRACT:
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° 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° 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.
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Allen Anthony J.
Busink Ronald
Carlin, Jr. Francis J.
Cheng Huai Nan
Crisp Mark T.
Buttner David J.
Fobare Rossi Joanne Mary
Hercules Incorporated
O'Brien Robert O'Flynn
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