Method of manufacturing superabsorbent polymers

Details Method of manufacturing superabsorbent polymers Method of manufacturing superabsorbent polymers

2005-03-26

2008-09-30

Lipman, Bernard (Department: 1796)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S328500, C525S330100, C525S384000

Reexamination Certificate

active

07429632

ABSTRACT:
An improved method of manufacturing surface-crosslinked superabsorbent polymer particles is disclosed. The superabsorbent polymer particles are surface crosslinked using about 20 to about 35 wt % of 1,3-propanediol as a cosolvent in a surface-crosslinking step. The use of 1,3-propanediol as a cosolvent reduces the amount of surface-crosslinking agent required to adequately surface crosslink the superabsorbent polymer, and reduces or eliminates the fouling of process equipment attributed to previous cosolvents used in a surface crosslinking step.

REFERENCES:
patent: 4043952 (1977-08-01), Ganslaw et al.
patent: 4051086 (1977-09-01), Reid
patent: 4541871 (1985-09-01), Obayashi et al.
patent: 4587308 (1986-05-01), Makita et al.
patent: 4666983 (1987-05-01), Tsubakimoto et al.
patent: 4734478 (1988-03-01), Tsubakimoto et al.
patent: 4789861 (1988-12-01), Baggett et al.
patent: 4824901 (1989-04-01), Alexander et al.
patent: 5164459 (1992-11-01), Kimura et al.
patent: 5385983 (1995-01-01), Graham
patent: 5409771 (1995-04-01), Dahmen et al.
patent: 5559335 (1996-09-01), Zeng et al.
patent: 5669894 (1997-09-01), Goldman et al.
patent: 5760080 (1998-06-01), Wada et al.
patent: 6150469 (2000-11-01), Harada et al.
patent: 6180724 (2001-01-01), Wada et al.
patent: 6300423 (2001-10-01), Engelhardt et al.
patent: 6639022 (2003-10-01), Michels et al.
patent: 6720389 (2004-04-01), Hatsuda et al.
patent: 6875511 (2005-04-01), Dairoku et al.
patent: 7241820 (2007-07-01), Smith et al.
patent: 2002/0013394 (2002-01-01), Dairoku et al.
patent: 2004/0176557 (2004-09-01), Mertens et al.
patent: 2004/0180189 (2004-09-01), Funk et al.
patent: 2006/0247377 (2006-11-01), Riegel et al.
patent: 40 20 780 (1991-08-01), None
patent: 0 509 708 (1992-10-01), None
patent: WO-92/16565 (1992-10-01), None
patent: WO-93/05080 (1993-03-01), None
patent: WO-99/42515 (1999-08-01), None
patent: WO-01/91815 (2001-12-01), None
patent: WO-02/20068 (2002-03-01), None
patent: WO-03/002623 (2003-01-01), None
patent: WO-2004/108795 (2004-12-01), None
International Search Report in PCT/EP2005/003209 dated Jun. 16, 2005.

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