公开(公告)号：ZA200505518B

公开(公告)日：2006-10-25

申请号：ZA200505518

申请日：2005-07-08

Applicant: BASF AG

Inventor： GERHARD NESTLER ,  JOACHIM M LLER-ENGEL KLAUS ,  STEFAN WICKEL

IPC: A61L20090101 ,  A61L15/60 ,  C07C20090101 ,  C08F20090101 ,  C08F8/00 ,  C08F20/06 ,  C08J3/12

Abstract: Preparation of low odor hydrogel-forming polymerisate based on acrylic acid involving preparation of a polymeric hydrogel by radical polymerization of acrylic acid containing monomer in an aqueous polymerization medium and conversion of the hydrogel into a particulate hydrogel or hydrogel forming powder, and treatment of these with a crosslinking substance having at least two latent functional groups reactive to the polymerisate carboxyl groups is new. A process for preparation of low odor hydrogel-forming polymerisate based on acrylic acid including the steps; (a) preparation of a polymeric hydrogel by radical polymerization of at least 50 wt.% of acrylic acid containing monomer composition in an aqueous polymerization medium and conversion of the hydrogel into a particulate hydrogel or a hydrogel forming powder, and optionally treatment of these with a crosslinking substance having at least two latent functional groups reactive to the polymerisate carboxyl groups, where in step (a) the acrylic acid contains at least 500 ppm of acrylic acid oligomer.

公开(公告)号：ID24896A

公开(公告)日：2000-08-31

申请号：ID20000788

申请日：1998-10-27

Applicant: BASF AG

Inventor： MICHAEL FRIED ,  GERHARD NESTLER ,  LEON KAGELER PAUL ,  EDWIN JAMES LAWRENCE

IPC: B63B25/08 ,  C08F2/42 ,  C08F20/02

Abstract: Free radical polymerizations are immediately terminated by adding a phenothiazine-containing solution whose solvent comprises at least 50% of its weight of an N-alkylpyrrolidone.