发明授权
US5142023A Continuous process for manufacture of lactide polymers with controlled
optical purity
失效
用于制造具有受控光学纯度的丙交酯聚合物的连续方法
- 专利标题: Continuous process for manufacture of lactide polymers with controlled optical purity
- 专利标题(中): 用于制造具有受控光学纯度的丙交酯聚合物的连续方法
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申请号: US825059申请日: 1992-01-24
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公开(公告)号: US5142023A公开(公告)日: 1992-08-25
- 发明人: Patrick R. Gruber , Eric S. Hall , Jeffrey J. Kolstad , Matthew L. Iwen , Richard D. Benson , Ronald L. Borchardt
- 申请人: Patrick R. Gruber , Eric S. Hall , Jeffrey J. Kolstad , Matthew L. Iwen , Richard D. Benson , Ronald L. Borchardt
- 申请人地址: MN Minnetonka
- 专利权人: Cargill, Incorporated
- 当前专利权人: Cargill, Incorporated
- 当前专利权人地址: MN Minnetonka
- 主分类号: C08G63/06
- IPC分类号: C08G63/06 ; C08G63/08
摘要:
A process for the continuous production of polylactide polymers from lactic acid which incorporates removal of water or a solvent carrier to concentrate the lactic acid feed followed by polymerization to a low-molecular-weight prepolymer. This prepolymer is fed to a reactor in which a catalyst is added to facilitate generation of lactide, the depolymerization product of polylactic acid. The lactide generated is continuously fed to a distillation system as a liquid or vapor wherein water and other impurities are removed. The resultant purified liquid lactide is fed directly to a polymerization process.
公开/授权文献
- US5967898A Tablet unit 公开/授权日:1999-10-19
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