Invention Grant
- Patent Title: Method to manufacture PLA using a new polymerization catalyst
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Application No.: US14888460Application Date: 2014-04-29
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Publication No.: US09957350B2Publication Date: 2018-05-01
- Inventor: Gerrit Gobius Du Sart , Matthew Gwilym Davidson , Christopher James Chuck
- Applicant: PURAC Biochem BV
- Applicant Address: NL Gorinchem
- Assignee: PURAC BIOCHEM BV
- Current Assignee: PURAC BIOCHEM BV
- Current Assignee Address: NL Gorinchem
- Agency: Mendelsohn Dunleavy, P.C.
- Priority: EP13166273 20130502
- International Application: PCT/EP2014/058688 WO 20140429
- International Announcement: WO2014/177543 WO 20141106
- Main IPC: C08G63/08
- IPC: C08G63/08 ; C08G63/85 ; C08G18/42 ; C08G63/82 ; C08F4/76 ; C07F7/00

Abstract:
The invention relates to a method for manufacturing polylactide, comprising the steps of mixing lactide and a metal-coordination compound as polymerization catalyst to obtain a reaction mixture, polymerizing the lactide in liquid phase at a temperature of at least 150° C. to form polylactide in liquid phase and allowing the polylactide to solidify, characterized in that the polymerization catalyst comprises a metal-ligand coordination compound whereby the parent ligand answers the formula (I), whereby R represents an H atom, an aliphatic group, a halide atom or a nitro group and the metal is at least one of Zr and Hf. The invented catalysts show kinetics which is comparable to the kinetics of the known Sn-octoate catalyst.
Public/Granted literature
- US20160075821A1 Method to Manufacture PLA Using a New Polymerization Catalyst Public/Granted day:2016-03-17
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