Shaped polylactide article and method of preparation
AssigneePurac Biochem B.V.
InventorsSiebe Cornelis De Vos, Robert Edgar Haan, Geraldus Gerardus Johannes Schennink
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Abstract
A method for preparing a shaped polylactide article including stereocomplex polylactide and to a shaped article obtainable by the method. In particular the method comprises melt mixing and solidifying poly-L-lactide (PLLA) and poly-D-lactide (PDLA) homopolymers in a weight ratio whereby one of the homopolymers is in excess, subsequently solid mixing the so obtained blend with additional homopolymer, and shaping the obtained solids mixture.
Claims15
A method for manufacturing a shaped polylactide article comprising stereocomplex polylactide (sc-PLA), which method includes the following steps:
- a) mixing an amount of a first homopolylactide with an excess amount of a second homopolylactide in the molten state to provide a molten blend, the first and second homopolylactides being different from each other and selected from a poly-D-lactide (PDLA) homopolymer and a poly-L-lactide (PLLA) homopolymer;
- b) solidifying the molten blend and allowing it to crystallize to provide a solidified blend comprising sc-PLA;
- c) mixing the solidified blend with an additional amount of the first homopolylactide in the solid state to provide a solids mixture;
- d) shaping the solids mixture by melt processing the solids mixture at a temperature above the melting temperature of the PDLA and PLLA homopolymers and below the melting temperature of the sc-PLA, and cooling the melt processed mixture to a temperature below the melting temperature of the PDLA and PLLA homopolymers to provide a shaped polylactide article comprising sc-PLA.
Dependencies are inferred from the claim text.