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:
Jan. 08, 2013
Filed:
Nov. 21, 2005
Anton Esser, Mannheim, DE;
Hans-joachim Haehnle, Neustadt, DE;
Martin Ruebenacker, Altrip, DE;
Norbert Schall, Roemerberg, DE;
Jacques Dupuis, Ketsch, DE;
Josef Neutzner, Neustadt, DE;
Manfred Niessner, Schifferstadt, DE;
Berthold Sturm, Worms, DE;
Anton Esser, Mannheim, DE;
Hans-Joachim Haehnle, Neustadt, DE;
Martin Ruebenacker, Altrip, DE;
Norbert Schall, Roemerberg, DE;
Jacques Dupuis, Ketsch, DE;
Josef Neutzner, Neustadt, DE;
Manfred Niessner, Schifferstadt, DE;
Berthold Sturm, Worms, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The invention relates to a process for producing paper, board and cardboard of high dry strength by separately adding a polymer comprising vinylamine units and a polymeric anionic compound to a paper pulp, dewatering the pulp and drying the paper products, which comprises using as polymeric anionic compound at least one copolymer obtainable by copolymerizing