Method for preparing water-absorbing polymer particles by...

Details Method for preparing water-absorbing polymer particles by... Method for preparing water-absorbing polymer particles by...

2007-12-03

2011-12-27

Cheung, William (Department: 1762)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C502S402000, C526S317100

Reexamination Certificate

active

08084556

ABSTRACT:
In a process for producing water-absorbing polymeric particles by suspension polymerization, a monomer solution is metered into a stirred reactor via at least one feed line, the stirred reactor has a volume of at least 1 m3and the at least one feed line ends in the stirred reactor at a point less than 25 cm above the liquid surface.

REFERENCES:
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patent: 6114478 (2000-09-01), Kersting et al.
patent: 2005/0074614 (2005-04-01), Jonas et al.
patent: 0 849 285 (1998-06-01), None
patent: 63 218702 (1988-09-01), None
patent: WO-2006/014031 (2006-02-01), None
International Search Report and Written Opinion in PCT/EP2007/063122 dated Mar. 18, 2008.
Buchholz et al.,Modern Superabsorbent Polymer Technology, pp. 69-117 (1998).

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