公开(公告)号：DE19625810A1

公开(公告)日：1998-01-02

申请号：DE19625810

申请日：1996-06-28

Applicant: HOECHST AG

Inventor： ENGELHARDT FRITZ DR ,  FRENZ VOLKER DR ,  STOCK JOCHEN DR ,  TARDI ARANKA

IPC: A61K47/32 ,  C08F220/58

Abstract: A water-soluble or water-absorbing polymer containing 90-99.99 wt.% of a residue of formula (I) and 0.01-10 wt.% of linking material formed from monomers containing at least two olefinic double bonds. In (I), X = a cation or a mixture of cations with . The number of residues of formula (I) in the polymer is such that the hydrodynamic volume of the polymer in aqueous solution has a radius of 10-500 nm and has a homogenous unimodal distribution. Also claimed are polymers containing a residue of formula (II), where R = H or Me.

公开(公告)号：ID17809A

公开(公告)日：1998-01-29

申请号：ID972521

申请日：1997-07-21

Applicant: HOECHST AG

Inventor： SIMON PETER DR ,  BLATTER KARRSTEN DR ,  HERMANN-SCHONHERR OTTO DR ,  LERGH ALEXANDER DR ,  STOCK JOCHEN DR ,  LANGER JORG

IPC: C08G63/688 ,  C08G63/78 ,  C08G63/81

公开(公告)号：DE19629430A1

公开(公告)日：1998-01-29

申请号：DE19629430

申请日：1996-07-22

Applicant: HOECHST AG

Inventor： SIMON PETER DR ,  BLATTER KARSTEN DR ,  HERMANN-SCHOENHERR OTTO DR ,  LERCH ALEXANDER DR ,  STOCK JOCHEN DR ,  LANGER JOERG

IPC: C08G63/688 ,  C08G63/78 ,  C08G63/81 ,  C08G63/181 ,  C08G63/199 ,  C08G63/672 ,  C08L67/00 ,  D06M15/507

Abstract: Disclosed is a method of preparing polyesters in powder form by means of polycondensation of dicarboxylic acid diol precondensates (oligomers) at elevated temperature in a heat transfer medium in the presence of polycondensation catalysts and optionally cocondensable modifiers. The liquid heat transfer medium is inert and free of aromatic components and has a boiling point in the range of 180 to 300 DEG C. The dicarboxylic acid diol precondensate contains on analytical average 1 to 30 mol % oligomer or monomer containing at least one sulfonic acid group. The weight ratio of dicarboxylic acid diol precondensate to liquid heat transfer medium is in the range of 20:80 to 80:20 and the polycondensation is carried out in the presence of a dispersion stabilizer, the resulting polyester being water-soluble.