Method for producing polylactic acid
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United States of America Patent
Stats
-
Jun 16, 2015
Grant Date -
Jul 11, 2013
app pub date -
Jun 16, 2011
filing date -
Jun 17, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
To provide a method capable of producing stereocomplex polylactic acid, the method being capable of using carbon neutral materials that are not competitive from foods, such as saccharides, without the use of a method for designing optical resolution, which requires complicated operations and high cost and is difficult to perform mass production. The production method of the present invention comprises: a step of reacting glycerin with sodium hydroxide in high-temperature and high-pressure water to produce a racemic sodium lactate aqueous solution; a step of separating sodium from the racemic sodium lactate aqueous solution to recover racemic lactic acid; a step of dimerizing the racemic lactic acid to produce a lactide mixture containing meso lactide and racemic lactide; a step of separating meso lactide from the mixture to recover racemic lactide; and a step of polymerizing the racemic lactide with a salen-metal complex as a catalyst to produce stereocomplex polylactic acid.
First Claim
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International Classification(s)
- 2011 Application Filing Year
- C08G Class
- 1816 Applications Filed
- 1451 Patents Issued To-Date
- 79.91 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C08G Class
- 0 % this patent is cited more than
- 10 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 16, 2026 |
