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US 2014/0213681 A1Published application
Method for Preparing Polycarbonate Resin
AssigneeCheil Industries Inc.
InventorsJin Yong BAE, Kyu Buem CHOI, Su Jeong SONG, Ho Sub LIM, Bok Nam JANG
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Abstract
A method for preparing a polycarbonate resin includes polymerizing an aromatic dihydroxyl compound and a diaryl carbonate to prepare a polycarbonate pre-polymer; injecting and mixing an inert gas with the prepared polycarbonate pre-polymer; and foaming and polymerizing the polycarbonate pre-polymer with which the inert gas is mixed. The method can prevent or reduce yellowing upon melt polymerization of the polycarbonate resin.
Claims13
A method of preparing a polycarbonate resin, comprising:
- polymerizing an aromatic dihydroxyl compound and a diaryl carbonate to prepare a polycarbonate pre-polymer;
- injecting and mixing an inert gas with the prepared polycarbonate pre-polymer;
- and
- foaming and polymerizing the prepared polycarbonate pre-polymer with which the inert gas is mixed.
1 more element
Dependencies are inferred from the claim text.