Patent · US Expired

Substances for the manufacture of paper

US4988790A · kind A · utility

4Cited by

9References

16Claims

0Family size

Assignee

Wolff Walsrode AG · DE

Inventors

Rudolf Behn · Walsrode, DE
Branislav Bohmer · Walsrode, DE
Lutz Hoppe
Klaus Szablikowski · Walsrode, DE

Key dates

Filing date	Jan 28, 1988
Grant date	Jan 29, 1991
Priority date	—
Expiry date	Jan 28, 2008

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21H17/54
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Substances suitable for use as retention agents contain a cationic polyacrylamide with recurrent dialkylaminoalkylacrylamide units and a polyamidamine or a polyamine.

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