Invention Grant
- Patent Title: Continuous process for manufacture of lactide polymers with purification by distillation
- Patent Title (中): 通过蒸馏纯化生产丙交酯聚合物的连续方法
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Application No.: US122145Application Date: 1993-09-16
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Publication No.: US5357035APublication Date: 1994-10-18
- Inventor: Patrick R. Gruber , Eric S. Hall , Jeffrey J. Kolstad , Matthew L. Iwen , Richard D. Benson , Ronald L. Borchardt
- Applicant: Patrick R. Gruber , Eric S. Hall , Jeffrey J. Kolstad , Matthew L. Iwen , Richard D. Benson , Ronald L. Borchardt
- Applicant Address: MN Minnetonka
- Assignee: Cargill, Incorporated
- Current Assignee: Cargill, Incorporated
- Current Assignee Address: MN Minnetonka
- Main IPC: C08G63/06
- IPC: C08G63/06 ; C08G63/08 ; C07D319/12
Abstract:
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.
Public/Granted literature
- US5066984A Decurler Public/Granted day:1991-11-19
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