Patent · US Expired

Linear basic polymers, their preparation and their use

US4421602A · kind A · utility

136Cited by

4References

8Claims

0Family size

Assignee

BASF SE

Inventors

Fritz Brunnmueller · Schifferstadt, DE
Rolf Schneider · Burgstetten, DE
Michael Kroener · Mannheim, DE
Hans Mueller · Frankenthal (Pfalz), DE
Friedrich Linhart · Heidelberg, DE

Key dates

Filing date	Jul 12, 1982
Grant date	Dec 20, 1983
Priority date	—
Expiry date	Jul 12, 2002

Classification

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

Abstract

Linear basic polymers containing, as characteristic components, from 90 to 10 mole % of copolymerized units of the formula ##STR1## and from 10 to 90 mole % of copolymerized units of the formula ##STR2## are obtained by polymerizing the compound of the formula CH.sub.2 .dbd.CH--NH--CHO (N-vinylformamide) to a polyvinylformamide in the presence of a free radical polymerization initiator and splitting off the formyl group from the resulting polymer at from 20.degree. to 200.degree. in the presence of an acid or base. The reaction products are used as retention agents, drainage assistants and flocculants in papermaking.

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