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:
Dec. 03, 2013
Filed:
May. 14, 2009
Applicants:
Anton Esser, Limburgerhof, DE;
Hans-joachim Haehnle, Neustadt, DE;
Inventors:
Anton Esser, Limburgerhof, DE;
Hans-Joachim Haehnle, Neustadt, DE;
Assignee:
BASF SE, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
D21H 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Process for the production of paper, board and cardboard having high dry strength by separate addition of a water-soluble cationic polymer and of an aqueous dispersion of a water-insoluble polymer having a content of acid groups of not more than 10 mol % or of an aqueous dispersion of a nonionic polymer, which dispersion has been made anionic, to a paper stock, draining of the paper stock and drying of the paper products. Preferably, the polymers are added to a paper stock which has a temperature of at least 40° C.