Porous polymeric particle comprising polyvinyl alcohol and...

Details Porous polymeric particle comprising polyvinyl alcohol and... Porous polymeric particle comprising polyvinyl alcohol and...

2008-09-23

2010-11-30

Le, H. (Holly) T (Department: 1787)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C424S489000, C424S493000, C424S501000, C428S304400, C428S310500, C514S951000, C514S964000

Reexamination Certificate

active

07842377

ABSTRACT:
A composition includes a plurality of particles. At least some of the plurality of particles include cross-linked polyvinyl alcohol and have a diameter of about 500 microns or less. The particles have a first average pore size in an interior region, and a second average pore size at a surface region. The first average pore size being greater than the second average pore size. The composition also includes a carrier fluid. The plurality of particles being in the carrier fluid.

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