Patent · US Active

Pulverulent polymers crosslinked on the surface

US7507475B2 · kind B2 · utility

13Cited by

13References

13Claims

0Family size

Assignee

Evonik Stockhausen GmbH · US

Inventors

Waldemar Inger · Krefeld, DE
Rudiger Hose · Tönisvorst, DE
Heinz-Peter Bohlmann · Krefeld, DE

Key dates

Filing date	Aug 17, 2004
Grant date	Mar 24, 2009
Priority date	—
Expiry date	Jun 7, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2998
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a pulverulent polymer post-crosslinked on the surface and absorbing water or aqueous liquids, synthesised from polymerised, optionally pre-crosslinked monomers containing partially neutralised carboxyl groups. The present invention also relates to a process for the post-treatment of the aforementioned polymers and the use of a solution of at least one salt of an at least trivalent cation for restoring the gel permeability of the aforementioned polymers that have been damaged by mechanical action.

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