公开(公告)号：EP1615715B1

公开(公告)日：2008-12-31

申请号：EP04722165.0

申请日：2004-03-20

申请人： BASF SE

发明人： BENNETT, Andrea, Karen, 56/39 Railway Villa ,  MITCHELL, Michael, A. ,  CARRICO, Peter, W.

IPC分类号： B01D61/14 ,  A61L15/60 ,  C08L39/02 ,  C08F8/12 ,  C08F6/12 ,  B01D63/16

CPC分类号： B01D61/145 ,  B01D61/027 ,  B01D61/04 ,  B01D61/16 ,  B01D2311/04 ,  B01J2220/68 ,  C08F6/06 ,  C08J3/03 ,  C08J2339/02 ,  C08L39/02 ,  B01D2311/18 ,  B01D2311/12

摘要： Process for reducing the content of water-soluble salts of aqueous solutions of polymers containing vinylamine groups by ultrafiltration to achieve a residual salt content of 1 to 10 % by weight based on total solution solids in the polymer solution comprising feeding an aqueous salt-containing solution of vinylamine group containing polymers at a polymer concentration of at least 7 % by weight to an ultrafiltration unit and removing the water-soluble salts with the permeate from the feed solution by adding thereto less than 4 parts by weight of water per one part by weight of the feed solution, and use of the polymer of the aqueous solutions thus purified as basic water-absorbing resin of multicomponent superabsorbent polymers. Preferably vibratory shear membranes in a diafiltration configuration are used.

公开(公告)号：EP1611165B1

公开(公告)日：2009-11-11

申请号：EP04721845.8

申请日：2004-03-19

申请人： BASF SE

发明人： HERFERT, Norbert ,  AZAD, Michael, M. ,  CARRICO, Peter, W.

IPC分类号： C08F4/04 ,  C08F4/32 ,  C08F4/40 ,  C08J3/28 ,  C08J3/12 ,  C08F6/00 ,  C08F2/10 ,  C08F2/48

CPC分类号： C08J3/28 ,  A61L15/60 ,  C08F6/006 ,  C08J2300/14 ,  Y10T428/2982

摘要： A color-stable superabsorbent polymer having long-term color stability, and methods of manufacturing the polymer, are disclosed. The color-stable superabsorbent polymer is prepared in the essential absence of a persulfate, and is subjected to a low dose of ultraviolet radiation. The resulting superabsorbent polymer resists color degradation during periods of extended storage, even at an elevated temperature and humidity.