Method of recovering lactide
US10457661B2 · kind B2 · utility
1Cited by
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5Claims
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Key dates
| Filing date | Nov 25, 2016 |
| Grant date | Oct 29, 2019 |
| Priority date | — |
| Expiry date | Nov 25, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of recovering lactide which includes throwing a polylactic acid and a depolymerization catalyst into an extruder (1) communicated with a vent chamber (3) maintained under a reduced pressure, melt-kneading the polylactic acid and the depolymerization catalyst together in the extruder (1), feeding the melt-kneaded product thereof into the vent chamber (3), depolymerizing the polylactic acid in the vent chamber (3), gasifying the formed lactide and recovering the gasified lactide from the vent chamber (3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.