Patent · US Expired

Production of paper, board and cardboard from paper stocks containing foreign materials

US5098521A · kind A · utility

9Cited by

2References

3Claims

0Family size

Assignee

BASF SE

Inventors

Enrique Freudenberg · Schifferstadt, DE
Friedrich Linhart · Heidelberg, DE
Rainer Tresch · Frankenthal (Pfalz), DE
Heinrich Hartmann · Schifferstadt, DE
Walter Denzinger · Speyer, DE
Michael Kroener · Mannheim, DE
Norbert Sendhoff · Havelsee, DE

Key dates

Filing date	Jan 9, 1991
Grant date	Mar 24, 1992
Priority date	—
Expiry date	Jan 9, 2011

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21H17/34
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Paper, board and cardboard are produced from paper stocks containing foreign substances by drainage in the presence of a polymer which contains, as typical polymerized constituents, units of the formulae ##STR1## where R.sup.1 and R.sup.2 are each H, C.sub.1 -C.sub.3 -alkyl, and which have K values of not less than 130, the polymers containing less than 10 mol % of units of the formula II.

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