Patent · US Expired

Flocculating agent comprising water-in-oil emulsion of H-active polymer carrying formaldehyde and amine radicals

US4093542A · kind A · utility

22Cited by

5References

8Claims

0Family size

Assignee

Chemische Fabrik Stockhausen & Cie · DE

Inventors

Kurt Dahmen · Rheydt, DE
Wolfgang Hubner · Kempen, DE
Eduard Barthell · Krefeld, DE

Key dates

Filing date	Jan 2, 1975
Grant date	Jun 6, 1978
Priority date	—
Expiry date	Jan 2, 1995

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21H17/455
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A flocculation, sedimentation, dehydration or retention composition comprising a dispersion of about 10 to 50% concentration by weight of a polymeric Mannich base in a mixture of water and a water-insoluble liquid, the Mannich base comprising an H-active polymer carrying radicals of a reaction with formaldehyde and a primary or secondary alkyl- or hydroxyalkylamine wherein the alkyl groups have up to about 18 carbon atoms. The amine is preferably dimethylamine or diethylamine and is used in approximately the same molar amount as the formaldehyde. The polymer preferably comprises acrylamide units and the polymerization may be effected either before or after reaction with the formaldehyde and amine.

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