Invention Grant
US6143863A Melt-stable lactide polymer composition and process for manufacture
thereof
有权
熔融稳定丙交酯聚合物组合物及其制造方法
- Patent Title: Melt-stable lactide polymer composition and process for manufacture thereof
- Patent Title (中): 熔融稳定丙交酯聚合物组合物及其制造方法
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Application No.: US309853Application Date: 1999-05-11
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Publication No.: US6143863APublication Date: 2000-11-07
- Inventor: Patrick Richard Gruber , Jeffrey John Kolstad , Eric Stanley Hall , Robin Sue Eichen Conn , Christopher M. Ryan
- Applicant: Patrick Richard Gruber , Jeffrey John Kolstad , Eric Stanley Hall , Robin Sue Eichen Conn , Christopher M. Ryan
- Applicant Address: MN Minneapolis
- Assignee: Cargill, Incorporated
- Current Assignee: Cargill, Incorporated
- Current Assignee Address: MN Minneapolis
- Main IPC: C08K3/16
- IPC: C08K3/16 ; A61L15/26 ; A61L31/06 ; C08G63/08 ; C08G63/88 ; C08G63/90 ; C08J5/18 ; C08K3/22 ; C08K3/26 ; C08K3/30 ; C08K3/34 ; C08K5/10 ; C08K5/13 ; C08K5/1515 ; C08K5/1575 ; C08K5/29 ; C08K5/51 ; C08K5/524 ; C08K5/54 ; C08L67/00 ; C08L67/04 ; C08L101/00 ; C08L101/16 ; C09D167/04 ; D01F6/62 ; D04H1/42 ; D21H19/28 ; D21H19/62
Abstract:
A lactide polymer composition combining compositional and purity limitations and catalyst optimization or addition of stabilizing agents resulting in a melt-stable polymer is disclosed. The melt-stable lactide polymer comprises a plurality of polylactide polymer chains, residual lactide in concentration of less than 2 percent and water in concentration of less than 1000 parts-per-million. A stabilizing agent in an amount sufficient to reduce depolymerization of the lactide polymer during melt-processing or alternatively, control of catalyst level at a molar ratio of monomer to catalyst greater than 3000:1 is also included in the melt-stable composition. A process for manufacture of a melt-stable lactide polymer composition includes polymerizing a lactide mixture and adding stabilizing agents sufficient to reduce depolymerization of the polylactide during melt-processing, followed by devolatilizing the polylactide to remove monomer and water.
Public/Granted literature
- US5645781A Process for preparing textured ceramic composites Public/Granted day:1997-07-08
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