Coating processes – Particles – flakes – or granules coated or encapsulated – Resin base
Reexamination Certificate
2004-08-05
2008-11-04
Le, H. T (Department: 1794)
Coating processes
Particles, flakes, or granules coated or encapsulated
Resin base
C427S372200, C427S385500, C428S403000, C428S407000
Reexamination Certificate
active
07445812
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.
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Ehrnsperger Bruno Johannes
Fossum Renae Dianna
Goldman Stephen Allen
Meyer Axel
Schmidt Mattias
Addington Eric T.
Le H. T
Powell John G.
The Procter & Gamble & Company
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