Patent · US Expired

Preparation of aqueous solutions of polymers containing vinylamine units, which solutions have a long shelf life, and their use

US6114435A · kind A · utility

5Cited by

6References

5Claims

0Family size

Assignee

BASF SE

Inventors

Claudia Nilz · Rödersheim-Gronau, DE
Manfred Winter · Dittelsheim-Heßloch, DE
Michael Kroner · Oerlinghausen, DE
Andreas Stange · Mannheim, DE
Rudolf Schuhmacher · Böhl-Iggelheim, DE

Key dates

Filing date	Sep 30, 1996
Grant date	Sep 5, 2000
Priority date	—
Expiry date	Sep 30, 2016

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F2800/20
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Solutions of polymers containing vinylamine units, which solutions have a long shelf life, are prepared by hydrolyzing polymers containing N-vinylcarboxamide units with acids in an aqueous medium and removing the carboxylic acids eliminated from the polymers as esters from the aqueous polymer solution after the hydrolysis by adding at least stoichiometric amounts of at least one C.sub.1 -C.sub.6 -alcohol and distilling off the esters from the reaction mixture, and said aqueous solutions are used as dry and wet strength agents in papermaking.

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