Patent · US Active

Method for producing paper, paperboard and cardboard having high dry strength

US7922867B2 · kind B2 · utility

4Cited by

6References

13Claims

0Family size

Assignee

BASF SE

Inventors

Norbert Schall · Langenpreising, DE
Ellen Krueger · Otterstadt, DE
Martin Ruebenacker · Altrip, DE

Key dates

Filing date	Mar 9, 2007
Grant date	Apr 12, 2011
Priority date	—
Expiry date	Dec 8, 2027

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21H17/43
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Process for the production of paper, board and cardboard having high dry strength by separate addition of a polymer comprising vinylamine units and of ligninsulfonic acid and/or a ligninsulfonate to a paper stock, draining of the paper stock and drying of the paper products.

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