Absorbent article comprising coated water-swellable material

US7396585B2 · 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: Jul 8, 2008
• Expiry date: Aug 5, 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 an absorbent structure comprising a solid, typically particulate, water-swellable material that comprises 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 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.