Patent · US Expired

Particulate polymers as filter aids

US6736981B2 · kind B2 · utility

2Cited by

6References

7Claims

0Family size

Assignee

BASF SE

Inventors

Marcos Gomez · Princeton, US
Tilman Rock · Sinsheim, DE
Helmut Meffert · Mannheim, DE
Axel Sanner · Bischofswerda, DE

Key dates

Filing date	Feb 19, 2002
Grant date	May 18, 2004
Priority date	—
Expiry date	Mar 27, 2022

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D37/02
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The use is described of particulate, water-insoluble and scarcely swellable polymers of ethylenically unsaturated monomers, which polymers contain, copolymerized, at least 20% by weight, based on the total weight of the monomers, of at least one &agr;,&bgr;-monoethylenically unsaturated monocarboxylic acid having from 3 to 6 carbons as filter aid for filtering aqueous liquids. Subject-matter of the invention are also water-insoluble, scarcely swellable polymers (popcorn polymers) that contain, copolymerized, &agr;,&bgr;-monoethylenically unsaturated carboxylic acids and styrene or styrene derivatives, and also a process for their preparation.

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