C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 67/04 (2006.01) C08J 3/20 (2006.01)
Patent
CA 2124846
A lactide polymer composition combining compositional and purity limitations and catalyst optimization or addition of stabilizing agents resulting in a melt-stable polymer is disclosed. The melt- stable lactide polymer comprises a mixture of polylactide material having a number average molecular weight of at least about 10,000, residual lactide in concentration of less than about 2% and water in a concentration no greater than 1000 parts-per-million. A stabilizing agent in an amount sufficient to reduce depolymerization of the lactide polymer during melt-processing or alternatively, control of catalyst level at a molar ratio of monomer to catalyst greater than 3000:1 is also included in the melt-stable composition. A process for manufacture of a melt-stable lactide polymer composition includes polymerizing a lactide mixture and adding stabilizing agents-sufficient to reduce depolymerization of the polylactide during melt-processing, followed by devolatilizing the polylactide to remove monomer and water.
Conn Robin S. E.
Gruber Patrick R.
Hall Eric S.
Kolstad Jeffrey J.
Ryan Christopher M.
Cargill Incorporated
Cargill Incorporated
Robic
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