Patent · US Expired

Method for producing powder-shaped cross-linked polymerizates

US6482917B1 · kind B1 · utility

3Cited by

3References

3Claims

0Family size

Assignee

BASF SE

Inventors

Volker Hildebrandt · Mannheim, DE
Reinhold Dieing · Schifferstadt, DE
Katrin Zeitz · Ludwigshafen, DE

Key dates

Filing date	Jan 2, 2001
Grant date	Nov 19, 2002
Priority date	—
Expiry date	Jan 2, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/54
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

A process for the preparation of pulverulent, cationic, crosslinked polymers based on monoethylenically unsaturated monomers containing a quaternized or quaternizable nitrogen atom comprises carrying out the polymerization in supercritical carbon dioxide as inert diluent with mixing at from 31° C. to 150° C. and above 73 bar.

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