Pulverulent polymers crosslinked on the surface

US7157141B2 · kind B2 · utility

Assignee

• Stockhausen GmbH · DE

Inventors

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

Key dates

• Filing date: Sep 27, 2002
• Grant date: Jan 2, 2007
• Expiry date: Sep 27, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.