公开(公告)号：DE50005555D1

公开(公告)日：2004-04-08

申请号：DE50005555

申请日：2000-11-10

Applicant: BASF AG

Inventor： HEIDE WILFRIED ,  WICKEL STEFAN ,  DANIEL THOMAS ,  NILGES JOACHIM ,  HOFMANN JUERGEN

IPC: B01J14/00 ,  B01J19/00 ,  B01J19/20 ,  C08F2/01 ,  C08F2/10 ,  C08F220/00

公开(公告)号：DE10221176A1

公开(公告)日：2003-11-27

申请号：DE10221176

申请日：2002-05-13

Applicant: BASF AG

Inventor： NESTLER GERHARD ,  MUELLER-ENGEL KLAUS JOACHIM ,  WICKEL STEFAN

IPC: A61F13/53 ,  A61F13/49 ,  A61L15/60 ,  C08F2/00 ,  C08F8/00 ,  C08F20/06 ,  C08F220/06

公开(公告)号：AU2003240228A1

公开(公告)日：2003-11-11

申请号：AU2003240228

申请日：2003-05-12

Applicant: BASF AG

Inventor： NESTLER GERHARD ,  MULLER-ENGEL KLAUS JOACHIM ,  WICKEL STEFAN

IPC: A61F13/53 ,  A61F13/49 ,  A61L15/60 ,  C08F2/00 ,  C08F8/00 ,  C08F20/06 ,  C08F220/06 ,  A61L15/00

公开(公告)号：DE10221202A1

公开(公告)日：2003-07-10

申请号：DE10221202

申请日：2002-05-13

Applicant: BASF AG

Inventor： NESTLER GERHARD ,  ECK BERND ,  WICKEL STEFAN ,  MUELLER-ENGEL KLAUS JOACHIM

IPC: C07C51/41 ,  C07C51/43 ,  C07C57/07 ,  A61L15/60

Abstract: neutralized acrylic acid solution suitable for polymer production is obtained by crystallisation of a crude acrylic acid melt (using known methods), separation of the crystalline acid from the residual melt and dissolution in aqueous alkali. A method for the production of aqueous, partly or completely neutralized acrylic acid (I) solution suitable for the production of acrylic acid polymers involves: (i) single- or multi-stage crystallisation of a crude acrylic acid melt by known methods to give crystalline (I) and an impurity-enriched residual melt; (ii) separation of (I) from the residual melt; and (iii) dissolution of (I) in aqueous alkali solution. An Independent claim is also included for a method for the production of acrylic acid-based superabsorbers by radical polymerisation of an aqueous monomer composition containing at least 50 wt.% neutralized (I) and optionally up to 50 wt.% comonomer(s) (B) and/or up to 30 wt.% crosslinkers (C) (obtained by adding B and/or C to the above solution of pure I) to give a hydrogel, converting this into a hydrogel-forming powder and optionally surface-crosslinking the powder.

公开(公告)号：CA2470586A1

公开(公告)日：2003-07-03

申请号：CA2470586

申请日：2002-12-18

Applicant: BASF AG

Inventor： WICKEL STEFAN ,  SCHROEDER JUERGEN ,  NESTLER GERHARD

IPC: C07C57/075 ,  A61L15/60 ,  C07C69/54 ,  C08F2/44 ,  C08F20/06 ,  C08L33/02 ,  A61L15/24

Abstract: The invention relates to novel super-absorbing polymers containing tocophero l, to a method for the production thereof using monomers containing tocopherol and carrying acid groups, especially acrylic acid, and to the use of the sam e for absorbing aqueous liquids.

公开(公告)号：CA2004331A1

公开(公告)日：1990-06-24

申请号：CA2004331

申请日：1989-11-30

Applicant: BASF AG

Inventor： NIESSNER MANFRED ,  WICKEL STEFAN ,  HEIDE WILFRIED ,  HARTMANN HEINRICH

IPC: A61L15/24 ,  A61L15/60 ,  C08F2/10 ,  C08F2/20 ,  C08F2/24 ,  C08F220/04 ,  C08F220/06 ,  C08F290/00 ,  C08F290/04 ,  C08F299/02 ,  C08F2/04

Abstract: O.Z. 0050/4043 Finely divided, gel-like, water-swellable copolymers are prepared by copolymerizing (a) 100 parts by weight of water-soluble, monoethylenically unsaturated monomers, (b) from 0.01 to 5 parts by weight of monomers containing two or more ethylenically unsaturated double bonds and (c) from 0 to 20 parts by weight of water-insoluble, monoethylenically unsaturated monomers in 20-80% strength by weight aqueous solution in the presence of a polymerization initiator and from 0.1 to 10% by weight, based on the monomers used in the copolymerization, of a surfactant, by a process in which the monomers are copolymerized in the presence of initially from 0 to 50% by weight of the amount of surfactant to a conversion of not less than 60%, the remaining amount of surfactant is then added to the reaction mixture and the copolymerization is completed and the resulting gel particles dried.