Process for making water-swellable material comprising coated water-swellable polymers

US7445812B2 · kind B2 · utility

Assignee

• The Procter & Gamble Company · US

Inventors

• Mattias Schmidt · Idstein, DE
• Axel Meyer · Frankfurt am Main, DE
• Renae Dianna Fossum · Middletown, US
• Stephen Allen Goldman · Wyoming, US
• Edward Joseph Urankar · Maineville, US
• Bruno Johannes Ehrnsperger · Bad Soden, DE

Key dates

• Filing date: Aug 5, 2004
• Grant date: Nov 4, 2008
• Expiry date: Sep 30, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

This invention is directed to a process for making solid, typically particulate, water-swellable material comprising coated water-swellable, preferably hydrogel-forming polymers, which are coated with a coating agent, which is such that it does not rupture when the polymers swell in a liquid, e.g., water or saline water. Hereto, the coating agent is extensible in wet state and comprises thereto a wet-extensible material that has a wet-elongation of at least 400%, or even more preferably at least 500%, and preferably a tensile stress at break in the wet state of at least 1 MPa. Typically, the coating agent comprises thereto an elastomeric polymeric material. The invention also relates to solid (particulate) water-swellable material obtainable by the process of the invention.