Patent · US Active

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

US8137746B2 · kind B2 · utility

3Cited by

108References

11Claims

0Family size

Assignee

The Procter & Gamble Company · US

Inventors

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

Key dates

Filing date	Aug 5, 2004
Grant date	Mar 20, 2012
Priority date	—
Expiry date	Feb 18, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31551
WIPO fieldOther special machines
WIPO sectorMechanical engineering

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 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.

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