Methods for producing lactide with recycle of meso-lactide
US8674056B2 · kind B2 · utility
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41Claims
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Key dates
| Filing date | Mar 12, 2010 |
| Grant date | Mar 18, 2014 |
| Priority date | — |
| Expiry date | Apr 24, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An S,S- and R,R-lactide stream suitable for polymerization is prepared by producing a low molecular weight poly(lactic acid), depolymerizing the low molecular weight poly(lactic acid) to form a mixture of S,S-, R,R- and meso-lactide, and separating meso-lactide from this mixture to form an S,S- and R,R-lactide stream. Meso-lactide is recycled into the process, and shifts the mole fractions of the lactides in the lactide mixture that is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.