Process for the preparation of copolyesters
AssigneeFerring B.V.
InventorsHans R. Kricheldorf, Ingrid Kreiser-Saunders, Dirk-Olaf Damrau
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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.
Claims22
A process for the preparation of copolyesters using cyclic esters or cyclocarbonates or a mixture of at least one cyclic ester and at least one cyclocarbonate as monomers and a metallic salt of the formula Me2+X2 as catalyst, wherein Me2+ represents Ca, Fe(II), Mg, Mn(II) or Zn, and X is an anion of an aminocarboxylic acid, hydroxycarboxylic acid, bromide or iodide, that monomer and catalyst are used in a monomer/catalyst molar ratio of greater than 100, and the monomers are structurally different.
Dependencies are inferred from the claim text.