公开(公告)号：AT260946T

公开(公告)日：2004-03-15

申请号：AT99948879

申请日：1999-09-28

Applicant: BASF AG

Inventor： DENTLER JOACHIM ,  HERFERT NORBERT ,  SCHLIWA RUDOLF ,  STUEVEN UWE ,  ENGELHARDT FRITZ

IPC: A61F13/15 ,  A61F13/53 ,  A61L15/00 ,  A61L15/60 ,  B01J20/26 ,  B01J20/30 ,  C08F2/01 ,  C08F8/44 ,  C08F220/06 ,  C08F251/00 ,  C08F261/04 ,  C08F283/00 ,  C08F283/02 ,  C08F283/06 ,  C08F291/00 ,  C08J3/12 ,  C09K3/00

Abstract: Water-swellable hydrophilic polymers are prepared by neutralization of the acidic hydrogel having a degree of neutralization of 0-40 mol % to an ultimate degree of neutralization of 60-85 mol % by mixing with a neutralizing agent in a mincer comprising a system of screw, rotating blade, restricted flow zone and breaker plate, whereinthe mincer has a power output of from 1000 to 6000 Wh/m3the hydrogel passes through a zone having-an energy dissipation density of from 400 to 800 W/1 of mixing volumethe average residence time of the hydrogel in the mincer is from 5 to 30 secondsthe breaker plate has an open area of from 20 to 40%.

公开(公告)号：DE19849499A1

公开(公告)日：2000-05-04

申请号：DE19849499

申请日：1998-10-27

Applicant: BASF AG

Inventor： DENTLER JOACHIM ,  HERFERT NORBERT ,  KLOTZSCHE HELMUT ,  SCHLIWA RONALD ,  STUEVEN UWE

IPC: B01J20/26 ,  B01J20/30 ,  B29B13/06 ,  C08F6/00 ,  C08J3/00 ,  C08J3/12 ,  F26B1/00

Abstract: The present invention relates to a complete drying method for hydrogels, whereby the following steps are carried out successively: a) the hydrogels are contact dried or dried by convection, b) the hydrogels are pre-crushed, c) the pre-crushed hydrogels are ground by means of a coarse crushing mill or a crushing roller mill, d) the damp elastic hydrogel particles are separated, e) the damp elastic hydrogel particles are finally dried.

公开(公告)号：CA2345625A1

公开(公告)日：2000-04-20

申请号：CA2345625

申请日：1999-10-01

Applicant: BASF AG

Inventor： DENTLER JOACHIM ,  FUNK RUDIGER ,  HERFERT NORBERT ,  ENGELHARDT FRIEDRICH ,  WANIOR MARIOLA

IPC: A61F13/15 ,  A61F13/53 ,  A61L15/00 ,  A61L15/60 ,  B01J20/26 ,  C08F2/10 ,  C08F6/02 ,  C08F6/26 ,  C08F8/00 ,  C08F8/42 ,  C08F20/02 ,  C08F22/00 ,  C08F28/02 ,  C08F30/02 ,  C08F220/06 ,  C08F251/00 ,  C08F261/04 ,  C08F283/02 ,  C08F283/06 ,  C08F291/00

Abstract: The invention relates to a hydrophilic hydrogel with a high swelling capacit y. The inventive hydrogel is based on (co)polymerised monomers or graft (co)polymers and is produced by a) radical (co)polymerisation of one or more hydrophilic monomers or graft (co)polymerisation of one or more hydrophilic monomers to a graft base, the average degree of neutralisation of the monome rs containing the acid groups being 0 to 40 mol. %, b) reducing the acidic hydrogel, c) neutralising the acidic hydrogel to an end degree of neutralisation of 50 85 mol. % by adding a neutralising agent, d) drying, milling, and sieving the hydrogel particles, the hydrogel having a centrifug e retention of at least 29g/g for a 0.9 % aqueous NaCl solution and a swelling height of at least 3.5 cm with vertical absorption (1 g) and an extractable content (16 h-value) of less than 5 % or a centrifuge retention of at least 23g/g for a 0.9 % aqueous NaCl solution and a swelling height of at least 5 cm with vertical absorption (3 g) and an extractable content (16 h-value) of le ss than 5 % t.

公开(公告)号：DE19846413A1

公开(公告)日：2000-04-13

申请号：DE19846413

申请日：1998-10-08

Applicant: BASF AG

Inventor： DENTLER JOACHIM ,  HERFERT NORBERT ,  SCHLIWA RONALD ,  STUEVEN UWE ,  ENGELHARDT FRITZ

IPC: A61F13/15 ,  A61F13/53 ,  A61L15/00 ,  A61L15/60 ,  B01J20/26 ,  B01J20/30 ,  C08F2/01 ,  C08F8/44 ,  C08F220/06 ,  C08F251/00 ,  C08F261/04 ,  C08F283/00 ,  C08F283/02 ,  C08F283/06 ,  C08F291/00 ,  C08J3/12 ,  C09K3/00 ,  C08F6/02

Abstract: Preparation of a water-swellable hydrophilic polymer (I) involves: (a) radical (co)polymerization of hydrophilic monomer(s) (II), or graft (co)polymerization of (II) onto a substrate, where the average degree of neutralization of acid monomers is 0-40 mol. %, (b) comminuting, (c) post-neutralizing (60-85 mol. %) in a shredder under specific conditions; (d) charging the particles to a band drier, without further mechanical shear; (e) drying; and (f) grinding and sieving. Preparation of a water-swellable hydrophilic polymer (I) involves: (a) radical (co)polymerization of one or more hydrophilic monomer(s) (II), or graft (co)polymerization of one or more (II) onto a substrate (III), where the average degree of neutralization of the monomers containing acid groups is 0-40 mol. %, (b) comminuting the acid hydrogel, (c) post-neutralizing to a final neutralization degree of 60-85 mol. % in a shredder of a system having a screw, rotating knives, damming zones and perforated disks, operating at an output of 1000-6000 Wh/m , energy dissipation density 400-800 W/l, dwell time 5-30 s and free hole surface 20-40% of the perforated disk; (d) charging the neutralized hydrogel particles to a band drier, without application of further mechanical shear force; (e) drying the particles in the band drier; and (f) grinding and sieving the dried hydrogel particles.

公开(公告)号：DE19846412A1

公开(公告)日：2000-04-13

申请号：DE19846412

申请日：1998-10-08

Applicant: BASF AG

Inventor： DENTLER JOACHIM ,  FUNK RUEDIGER ,  HERFERT NORBERT ,  WANIOR MARIOLA ,  ENGELHARDT FRITZ

IPC: A61F13/15 ,  A61F13/53 ,  A61L15/00 ,  A61L15/60 ,  B01J20/26 ,  C08F2/10 ,  C08F6/02 ,  C08F6/26 ,  C08F8/00 ,  C08F8/42 ,  C08F20/02 ,  C08F22/00 ,  C08F28/02 ,  C08F30/02 ,  C08F220/06 ,  C08F251/00 ,  C08F261/04 ,  C08F283/02 ,  C08F283/06 ,  C08F291/00 ,  C08F283/00

Abstract: A new hydrophilic, highly swellable hydrogel (I) is obtained by: (a) radical (co)polymerization of hydrophic monomer(s) (II), or graft (co)polymerization of (II) onto a substrate; (b) comminuting; (c) post-neutralizing; and (d) drying, grinding and sieving, and has characteristic centrifuge retention, swelling height on vertical absorption and extractable content properties. A novel hydrophilic, highly swellable hydrogel (I) is obtained by; (a) radical (co)polymerization of one or more hydrophic monomer(s) (II), or graft (co)polymerization of one or more (II) onto a substrate (III), where the average degree of neutralization of the monomers containing acid groups is 0-40 mol. %; (b) comminuting the acid hydrogel; (c) post-neutralizing to a final neutralization degree of 50-85 mol. %; (d) and drying, grinding and sieving the hydrogel particles. (I) has either: (i) a centrifuge retention for 0.9% aqueous sodium chloride solution of at least 29 g/g, a swelling height on vertical absorption (1 g) of at least 3.5 cm and an extractable content (16 hour value) of less than 5%; or (ii) a centrifuge retention for 0.9% aqueous sodium chloride solution of at least 23 g/g, a swelling height on vertical absorption (3 g) of at least 3.5 cm and an extractable content (16 hour value) of less than 4%.