Method for producing low-odor hydrogel-forming polymers

Details Method for producing low-odor hydrogel-forming polymers Method for producing low-odor hydrogel-forming polymers

2007-12-11

2007-12-11

Choi, Ling-Sui (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S348000, C562S600000, C528S50200C, C528S50200C, C528S503000

Reexamination Certificate

active

10511603

ABSTRACT:
This invention relates to a process for preparing a low-odor hydrogel-forming acrylic acid polymer, which comprises the steps of: a) preparing a polymeric hydrogel by free-radically polymerizing a monomer composition comprising at least 50% by weight of acrylic acid in an aqueous polymerization medium and converting said hydrogel into a particulate hydrogel or into hydrogel-forming powder; and optionally b) treating said particulate hydrogel or said hydrogel-forming powder with a crosslinking substance which, actually or latently, contain at least two functional groups capable of reacting with the carboxyl groups on the addition polymer; characterized by the acrylic acid used in step a) containing less than 400 ppm of acetic acid and propionic acid. It further relates to the hydrogel-forming addition polymers obtainable by the process and to their use.

REFERENCES:
patent: 4306955 (1981-12-01), Neel et al.
patent: 4742114 (1988-05-01), Wetegrove et al.
patent: 5504247 (1996-04-01), Saxer et al.
patent: 5817865 (1998-10-01), Machhammer et al.
patent: 6388000 (2002-05-01), Irie et al.
patent: 6596901 (2003-07-01), Eck et al.
patent: 6710141 (2004-03-01), Heide et al.
patent: 2004/0186229 (2004-09-01), Heide et al.
patent: 100 03 497 (2001-04-01), None
patent: 0 372 706 (1990-06-01), None
patent: 0 574 260 (1993-12-01), None
patent: 0 616 998 (1994-09-01), None
patent: 0 648 520 (1995-04-01), None
patent: 0 730 893 (1996-09-01), None
patent: 0 776 875 (1997-06-01), None
patent: 0 942 014 (1999-09-01), None
patent: 62-260906 (1987-11-01), None
patent: 5-40649 (1993-02-01), None
patent: 09-227445 (1997-09-01), None
patent: 08-034757 (1998-02-01), None
patent: 98 25889 (1996-12-01), None
patent: WO 98/01415 (1998-01-01), None
patent: WO 01/38402 (2001-05-01), None
patent: 01 77056 (2001-10-01), None

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