Superabsorbent polymer having increased rate of water...

Details Superabsorbent polymer having increased rate of water... Superabsorbent polymer having increased rate of water...

2006-12-14

2009-11-10

Choi, Ling-Siu (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S142000, C523S105000, C523S132000, C523S173000, C524S729000, C525S329700, C525S330200

Reexamination Certificate

active

07615579

ABSTRACT:
The invention relates to a superabsorbent polymer wherein an increased rate of water absorption is obtained by the addition of an encapsulated blowing agent. The invention relates to a superabsorbent polymer including an encapsulating blowing agent and having a vortex time of 40 seconds or less. In particular, the superabsorbent polymer includes from about 55 to about 99.9 wt. % of polymerizable unsaturated acid group containing monomers; from about 0.001 to about 5.0 wt. % of internal crosslinking agent; wherein the wherein the composition has a degree of neutralization of more than about 20%; and from about 0.05 to about 10.0 wt. % of an encapsulated blowing agent.

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International Search Report mailed on May 8, 2005 in connection with PCT/US2004/04229.
Written Opinion of the International Searching Authority mailed on May 8, 2005 in connection with PCT/US2004/04229.

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