Water-absorbent resin and production process therefor

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C524S916000, C526S063000, C526S068000, C526S070000, C526S088000, C526S317100

Reexamination Certificate

active

06867269

ABSTRACT:
The present invention provides such a production process that a low-cost water-absorbent resin having excellent quality can be obtained by reasonable steps in aqueous solution polymerization. The production process for a water-absorbent resin comprises a polymerization setup that includes the steps of: supplying an aqueous solution of a water-soluble unsaturated monomer component including a major proportion of acrylic acid and/or its salt into a polymerization vessel causing shearing action; and then carrying out polymerization, involving crosslinking, of the water-soluble unsaturated monomer and at the same time carrying out fine division of the resultant hydrogel; with the production process being characterized in that the aqueous solution of the water-soluble unsaturated monomer component as supplied into the polymerization vessel has a temperature of not lower than 40° C.

REFERENCES:
patent: 4552938 (1985-11-01), Mikita et al.
patent: 4625001 (1986-11-01), Tsubakimoto et al.
patent: 4654393 (1987-03-01), Mikita et al.
patent: 4703067 (1987-10-01), Mikita et al.
patent: 4914170 (1990-04-01), Chang et al.
patent: 4957984 (1990-09-01), Itoh et al.
patent: 4985518 (1991-01-01), Alexander et al.
patent: 5086133 (1992-02-01), Itoh et al.
patent: 5185413 (1993-02-01), Yoshinaga et al.
patent: 5380808 (1995-01-01), Sumiya et al.
patent: 5385983 (1995-01-01), Graham
patent: 5399591 (1995-03-01), Smith et al.
patent: 5633329 (1997-05-01), Hahnle et al.
patent: 6100305 (2000-08-01), Miyake et al.
patent: 6140395 (2000-10-01), Hatsuda et al.
patent: 6174978 (2001-01-01), Hatsuda et al.
patent: 6187828 (2001-02-01), Woodrum et al.
patent: 6657015 (2003-12-01), Riegel et al.
patent: 3831261 (1990-03-01), None
patent: 0 280 541 (1988-08-01), None
patent: 280541 (1988-08-01), None
patent: 0 347 241 (1989-12-01), None
patent: 55-58208 (1980-04-01), None
patent: 55-147512 (1980-11-01), None
patent: 56-147809 (1981-11-01), None
patent: 58-71907 (1983-04-01), None
patent: 59-18712 (1984-01-01), None
patent: 63-275607 (1988-11-01), None
patent: 63-275608 (1988-11-01), None
patent: 1-165610 (1989-06-01), None
patent: 1-318022 (1989-12-01), None
patent: 2-129207 (1990-05-01), None
patent: 2-215801 (1990-08-01), None
patent: 4-175319 (1992-06-01), None
patent: 9-67404 (1997-03-01), None
patent: 10-45812 (1998-02-01), None
patent: 10-119042 (1998-05-01), None
patent: 10-182750 (1998-07-01), None
patent: 11-181005 (1999-07-01), None
patent: 11-188725 (1999-07-01), None
patent: 11188725 (1999-07-01), None
patent: 11-188726 (1999-07-01), None
patent: 11-188727 (1999-07-01), None
patent: 11-228604 (1999-08-01), None
patent: WO 0138402 (2001-05-01), None
patent: WO 200138402 (2001-05-01), None
patent: WO 03022896 (2003-03-01), None
“An Efficient Preparation Method for Superabsorbent Polymers”, CHEN, Journal of Applied Polymer Science, vol. 74, pp. 119-124 (1999).
Chemical Engineering Handbook, 6thEdition, edited by Society of Chemical Engineers, published by Marzun Co., Ltd. 1999, p. 843, Table 16.4 and English translation thereof.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Water-absorbent resin and production process therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Water-absorbent resin and production process therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water-absorbent resin and production process therefor will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3432009

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.