The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 2007
Filed:
Mar. 25, 2003
Richard James Riehle, Wilmington, DE (US);
Anthony J. Allen, Wilmington, DE (US);
Michaela Hofbauer, Roosendaal, NL;
Alfred Jacques Haandrikman, Amersfoort, NL;
Ronald Busink, Bennekom, NL;
Mark T. Crisp, Amersfoort, NL;
John James Hoglen, Newark, DE (US);
Huai Nan Cheng, Wilmington, DE (US);
Francis J. Carlin, Jr., Newark, DE (US);
John Arthur Lapre, Ede, NL;
Harold Jabloner, Landenburg, PA (US);
Richard James Riehle, Wilmington, DE (US);
Anthony J. Allen, Wilmington, DE (US);
Michaela Hofbauer, Roosendaal, NL;
Alfred Jacques Haandrikman, Amersfoort, NL;
Ronald Busink, Bennekom, NL;
Mark T. Crisp, Amersfoort, NL;
John James Hoglen, Newark, DE (US);
Huai Nan Cheng, Wilmington, DE (US);
Francis J. Carlin, Jr., Newark, DE (US);
John Arthur Lapre, Ede, NL;
Harold Jabloner, Landenburg, PA (US);
Hercules Incorporated, Wilmington, DE (US);
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.