Water-absorbent resin and production process therefor

Details Water-absorbent resin and production process therefor Water-absorbent resin and production process therefor

2006-03-07

2006-03-07

Lipman, Bernard (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S317100, C526S318500, C524S556000, C528S50200C, C562S600000

Reexamination Certificate

active

07009010

ABSTRACT:
To provide: a process in which a coarse gel itself is made not to form in the case of applying the aqueous solution polymerization; and a process in which the polymerization is mildly controlled and the production is stably carried out in the case of applying the reversed-phase suspension polymerization or static polymerization, in a production of a water-absorbent resin. In a production process for a water-absorbent resin, which comprises a polymerization step that includes the steps of: carrying out polymerization, involving crosslinking, of an aqueous solution of a water-soluble unsaturated monomer including acrylic acid(salt); and at the same time carrying out fine division of the resultant hydrogel, or in a production process for a water-absorbent resin, which comprises the steps of: carrying out polymerization, involving crosslinking, of an aqueous solution of a water-soluble unsaturated monomer including acrylic acid(salt); and carrying out fine division of the resultant hydrogel, or in a production process for a water-absorbent resin, which comprises a polymerization step that includes the steps of: carrying out polymerization, involving crosslinking, of an aqueous solution of a water-soluble unsaturated monomer including acrylic acid(salt); and at the same time obtaining a finely divided hydrogel, the water-soluble unsaturated monomer is adjusted in order to contain furfural in an amount of 11 to 1,000 weight ppm (relative to the monomer).

REFERENCES:
patent: 4093776 (1978-06-01), Aoki et al.
patent: 4367323 (1983-01-01), Kitamura et al.
patent: 4446261 (1984-05-01), Yamasaki et al.
patent: 4625001 (1986-11-01), Tsubakimoto et al.
patent: 4683274 (1987-07-01), Nakamura et al.
patent: 4769427 (1988-09-01), Nowakowsky et al.
patent: 4857610 (1989-08-01), Chmelir et al.
patent: 4873299 (1989-10-01), Nowakowsky et al.
patent: 4985514 (1991-01-01), Kimura et al.
patent: 5124416 (1992-06-01), Haruna et al.
patent: 5149750 (1992-09-01), Niessner et al.
patent: 5164459 (1992-11-01), Kimura et al.
patent: 5244735 (1993-09-01), Kimura et al.
patent: 5250640 (1993-10-01), Irie et al.
patent: 5380808 (1995-01-01), Sumiya et al.
patent: 5385983 (1995-01-01), Graham
patent: 5409771 (1995-04-01), Dahmen et al.
patent: 5462972 (1995-10-01), Smith et al.
patent: 5597873 (1997-01-01), Chambers et al.
patent: 5610220 (1997-03-01), Klimmek et al.
patent: 5633316 (1997-05-01), Gartner et al.
patent: 5672633 (1997-09-01), Brehm et al.
patent: 5759358 (1998-06-01), Bauer et al.
patent: 6071976 (2000-06-01), Dairoku et al.
patent: 6139742 (2000-10-01), Bhattacharyya et al.
patent: 6174978 (2001-01-01), Hatsuda et al.
patent: 6228930 (2001-05-01), Dairoku et al.
patent: 6241928 (2001-06-01), Hatsuda et al.
patent: 6254990 (2001-07-01), Ishizaki et al.
patent: 6291636 (2001-09-01), Miyake et al.
patent: 6444744 (2002-09-01), Fujimaru et al.
patent: 2002/0120085 (2002-08-01), Matsumoto et al.
patent: 0 349 240 (1990-01-01), None
patent: 0 450 923 (1991-10-01), None
patent: 0 450 924 (1991-10-01), None
patent: 0 574 260 (1993-12-01), None
patent: 0 605 150 (1994-07-01), None
patent: 0 605 150 (1994-07-01), None
patent: 0 668 080 (1995-08-01), None
patent: 0 812 873 (1997-12-01), None
patent: 0 942 014 (1999-09-01), None
patent: 1 178 059 (2002-02-01), None
patent: 1 260 527 (2002-11-01), None
patent: 1 302 485 (2003-04-01), None
patent: 3-31306 (1991-02-01), None
patent: 4-255701 (1992-09-01), None
patent: 6-107800 (1994-04-01), None
patent: 6-142612 (1994-05-01), None
patent: 6-211934 (1994-08-01), None
patent: 7-82210 (1995-03-01), None
patent: 7-224204 (1995-08-01), None
patent: 7-242709 (1995-09-01), None
patent: 11-71529 (1999-03-01), None
patent: 11-322846 (1999-11-01), None
patent: 2002-212204 (2002-07-01), None
patent: WO 94/15971 (1994-07-01), None
patent: WO 95/22356 (1995-08-01), None
patent: WO 99/42494 (1999-08-01), None
patent: WO 99/42496 (1999-08-01), None
patent: WO 99/43720 (1999-09-01), None
patent: WO 00/24810 (2000-05-01), None
patent: WO 01/38402 (2001-05-01), None

Affiliated with

Also associated with

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

Comments { 0 }

Profile ID: LFUS-PAI-O-3564792