Patent · US Active

Process for increasing the dry strength of paper, board and cardboard

US8404083B2 · kind B2 · utility

10Cited by

5References

16Claims

0Family size

Assignee

BASF SE

Inventors

Hans-Joachim Haehnle · Neustadt, DE
Christian Jehn-Rendu · Orange, FR
Rainer Blum · Ludwigshafen, DE
Ellen Krueger · Otterstadt, DE
Norbert Schall · Langenpreising, DE
Martin Ruebenacker · Altrip, DE

Key dates

Filing date	Aug 10, 2009
Grant date	Mar 26, 2013
Priority date	—
Expiry date	Sep 28, 2029

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21H17/56
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Process for the production of paper, board and cardboard having high dry strength by addition of at least one water-soluble (a) polymer comprising vinylamine units and at least one (b) polymer comprising ethylenimine units and at least one water-soluble polymeric anionic compound to a paper stock, draining of the paper stock with sheet formation and drying of the paper products, the water-soluble cationic polymers (a) and (b) being metered in any sequence or as a mixture into a paper stock, and papers which are obtainable by this process.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.