Invention Grant
- Patent Title: Process for preparing polyesters by using an additive
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Application No.: US16622738Application Date: 2017-07-06
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Publication No.: US11254785B2Publication Date: 2022-02-22
- Inventor: Holger Bachmann , Rainer Linke , Eckhard Seidel , Michael Reisen , Reza Sarbandi
- Applicant: TECHNIP ZIMMER GMBH
- Applicant Address: DE Frankfurt am Main
- Assignee: TECHNIP ZIMMER GMBH
- Current Assignee: TECHNIP ZIMMER GMBH
- Current Assignee Address: DE Frankfurt am Main
- Agency: Lott & Fischer, P.L.
- International Application: PCT/EP2017/067033 WO 20170706
- International Announcement: WO2019/007522 WO 20190110
- Main IPC: C08G63/78
- IPC: C08G63/78 ; C08G63/183
Abstract:
A process for reducing the amount of hydroxyl-end-groups of a polyester, wherein the polyester is prepared from at least one dicarboxylic acid and at least one dihydroxy alcohol, and at least one additive selected from the group consisting of carboxylic acid anhydride and mono-isocyanate, and wherein the additive is added during a step of prepolycondensation and/or during a step of polycondensation and/or after a step of polycondensation.
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