公开(公告)号：DE50014971D1

公开(公告)日：2008-03-27

申请号：DE50014971

申请日：2000-11-10

Applicant: BASF AG

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

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

公开(公告)号：AT238374T

公开(公告)日：2003-05-15

申请号：AT96110598

申请日：1996-07-01

Applicant: BASF AG

Inventor： ENGELHARDT FRITZ DR ,  STUEVEN UWE DR ,  DANIEL THOMAS DR ,  HERFERT NORBERT DR

IPC: A61L15/34 ,  A61L15/60 ,  C08J3/075 ,  C08J3/12 ,  C08J7/04 ,  C08L1/28 ,  C08L3/08 ,  C08L91/06 ,  C09D123/06 ,  C09D123/30 ,  C09D191/06 ,  C08L101/14

Abstract: Hydraulic, highly swellable hydrogel (H)- coated with 0.05 - 2 wt.% unreactive, water-insoluble wax (w.r.t. (H)). Also claimed are: (i) the prepn. of (H) by applying the wax onto the hydrogel; and (ii) a method for preventing hydrogels getting dusty by coating them with 0.05 - 2 wt.% wax. Pref. the wax has a m.pt. or drip temp. of 30-180 degrees C and is pref. grafted montan wax or polyethylene wax (oxidate). The hydrogel is coated with 0.1-0.95 wt% wax. (H) is a polymer comprising (co)polymerised hydrophilic monomers, graft (co)polymer comprising one or more hydrophilic monomers grafted onto a suitable backbone, cross-linked cellulose- or starch ether, or natural substance swellable in aq. liq(s)..

公开(公告)号：DE59711506D1

公开(公告)日：2004-05-19

申请号：DE59711506

申请日：1997-01-10

Applicant: BASF AG

Inventor： DANIEL THOMAS DR ,  HERFERT NORBERT DR ,  REMMEL GUSTAV ,  RIEGEL ULRICH ,  STUEVEN UWE DIPL ING ,  ENGELHARDT FRITZ DR

IPC: C08J3/00 ,  C08J3/075

Abstract: Improving the drying properties of hydrophilic, highly swellable hydrogels when using contact driers by use of surfactant is new. Preferably heated rollers are used having a contact surface temperature at least 120 degrees C. Nonionic or anionic surfactants are used, having an HLB at least 3, in amounts of 0.01-5 wt. %, referred to solids content of the hydrogel. The hydrogels are based on (co)polymers of hydrophilic monomers, graft (co)polymers of hydrophilic monomers on a suitable graft base, crosslinked cellulose or starch ethers or natural products swellable in aqueous liquids, e.g. guar derivatives, optionally chemically modified.

公开(公告)号：DE59610360D1

公开(公告)日：2003-05-28

申请号：DE59610360

申请日：1996-07-01

Applicant: BASF AG

Inventor： ENGELHARDT DR ,  STUEVEN DR ,  DANIEL THOMAS DR ,  HERFERT DR

IPC: A61L15/34 ,  A61L15/60 ,  C08J3/075 ,  C08J3/12 ,  C08J7/04 ,  C08L1/28 ,  C08L3/08 ,  C08L91/06 ,  C09D123/06 ,  C09D123/30 ,  C09D191/06

Abstract: Hydraulic, highly swellable hydrogel (H)- coated with 0.05 - 2 wt.% unreactive, water-insoluble wax (w.r.t. (H)). Also claimed are: (i) the prepn. of (H) by applying the wax onto the hydrogel; and (ii) a method for preventing hydrogels getting dusty by coating them with 0.05 - 2 wt.% wax. Pref. the wax has a m.pt. or drip temp. of 30-180 degrees C and is pref. grafted montan wax or polyethylene wax (oxidate). The hydrogel is coated with 0.1-0.95 wt% wax. (H) is a polymer comprising (co)polymerised hydrophilic monomers, graft (co)polymer comprising one or more hydrophilic monomers grafted onto a suitable backbone, cross-linked cellulose- or starch ether, or natural substance swellable in aq. liq(s)..