Method for preparing polyesters having intrachain free acid functions
AssigneeSociete de Conseils de Recherches et d'Applications Scientifiques (S.C.R.A.S.)
InventorsJean-Bernard Cazaux, Charles Brigati, Alexandre Louchkoff, Francis Diancourt
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Abstract
The invention relates to a method for preparing polyesters A containing several mid-chain free acid functions by ring-opening polymerisation in the presence of a chain initiator: the benzyl diester of the tartaric acid, the phenyl radical of which is optionally substituted. A: aliphatic based on cyclic esters such as lactides and glycolides.
Claims5
A process for the preparation of a polyester containing several free acid functions arranged in the middle of the chain, based on a member of the group consisting of L-lactic acid, D-lactic acid, DL-lactic acid, ε-caprolactone, p-dioxanone, ε-caproic acid, alkylene oxalate, cycloalkylene oxalate, alkylene succinate, β-hydroxybutyrate, substituted or non-substituted trimethylene carbonate, 1,5-dioxepan-2-one, 1,4-dioxepan-2-one, glycolide, glycolic acid, L-lactide, D-lactide, DL-lactide, meso-lactide;
- and all optically active isomers, racemates or copolymers of the latter comprising ring-opening polymerization in the presence of as a chain initiator:
- tartaric acid benzyl diester, the phenyl portion of the benzyl which is optionally substituted.
Dependencies are inferred from the claim text.