发明名称 |
PROCESS AND APPARATUS FOR PREPARATION OF A CRYSTALLIZABLE POLYLACTIC ACID MIXTURE, AND POLYLACTIC ACID MIXTURE |
摘要 |
In a practicable continuous or batchwise process for the preparation of a crystallizable polylactic acid mixture, lactic acid may be polycondensed to yield an oligomer, which may then be depolymerized to yield a crude lactide. The crude lactide may be purified to yield a pure lactide, wherein fractionation may be carried out in the purification into an L- or D-lactide-rich fraction and also a meso-lactide-rich fraction. Subsequently a separate ring-opening polymerization of the resulting lactide fractions can be carried out. The individual polylactic acid batches or streams generated by the ring-opening polymerization may then be mixed. The present disclosure further relates to apparatuses for carrying out such processes and polylactic acid mixtures. |
申请公布号 |
US2016280908(A1) |
申请公布日期 |
2016.09.29 |
申请号 |
US201415037277 |
申请日期 |
2014.10.24 |
申请人 |
Uhde Inventa-Fischer GmbH ;Thyssenkrupp AG |
发明人 |
HAGEN Rainer;MÜHLBAUER Udo;PAETZ Caspar |
分类号 |
C08L67/04;C08G63/78;B01J19/24;C08G63/08 |
主分类号 |
C08L67/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
Berlin DE |