Pulverulent polymers crosslinked on the surface

US6863978B2 · kind B2 · utility

Assignee

• Stockhausen GmbH & Co. KG · DE

Inventors

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

Key dates

• Filing date: Sep 27, 2002
• Grant date: Mar 8, 2005
• Expiry date: Sep 27, 2022

Classification

• Technology area (CPC —): General

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.