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:
Sep. 09, 2003
Filed:
Oct. 01, 1999
Rainer Dyllick-Brenzinger, Weinheim, DE;
Primoz Lorencak, Ludwigshafen, DE;
Hubert Meixner, Ludwigshafen, DE;
Peter Baumann, Böhl-Iggelheim, DE;
Ellen Krüger, Mannheim, DE;
Andreas Stange, Mannheim, DE;
Martin Rübenacker, Altrip, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Paper, board and cardboard having high dry strength are produced by the addition of cationic, anionic and/or amphoteric starch as dry strength agents to the paper stock and drainage of the paper stock with sheet formation in the presence of cationic polymers as retention aids for starch, and cationic polymeric retention aids are used for increasing the retention of dry strength agents comprising cationic, anionic and/or amphoteric starch in the production of paper, board and cardboard.