Invention Grant
- Patent Title: Polycarbonates with a low yellowness index
- Patent Title (中): 黄色指数低的聚碳酸酯
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Application No.: US09868826Application Date: 2001-06-20
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Publication No.: US06395864B1Publication Date: 2002-05-28
- Inventor: Steffen Kühling , Rolf Lanze , Michael Prein , Rainer Neumann , Hermann Kauth , Christian Kords , Frieder Heydenreich , Tony van Osselaer , Wilfried Haese
- Applicant: Steffen Kühling , Rolf Lanze , Michael Prein , Rainer Neumann , Hermann Kauth , Christian Kords , Frieder Heydenreich , Tony van Osselaer , Wilfried Haese
- Priority: DE19859692 19981223; DE19859690 19981223; DE19904408 19990204
- Main IPC: C08G6400
- IPC: C08G6400
Abstract:
A process for the preparation of polycarbonate resins having a low yellowness index is described. The process involves converting phosgene with a sodium bisphenolate solution by means of a phase interface process performed with the exclusion of oxygen. The sodium bisphenolate solution used in the process has a dissolved oxygen content of
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