Patents Assigned to Ferring GmbH
  • Process for the preparation of copolyesters
    Patent number: 6297350
    Abstract: Copolyesters are prepared using cyclic esters or carbonates as monomers and a metallic salt of the formula Me2+X2 as catalyst. Me2+ represents Ca, Fe(II), Mg, Mn(II) or Zn, and X is an anion of an aminocarboxylic acid, hydroxycarboxylic acid or a halide. Monomer and catalyst are used in a monomer/catalyst ratio of greater than 100.
    Type: Grant
    Filed: February 15, 2000
    Date of Patent: October 2, 2001
    Assignee: Ferring GmbH
    Inventors: Hans R. Kricheldorf, Ingrid Kreiser-Saunders, Dirk-Olaf Damrau