发明名称 |
METHOD FOR PREPARING A COMPOSITION COMPRISING PERFLUOROPOLYETHER HAVING A CARBOXYL GROUP AT ONE TERMINAL |
摘要 |
An object of the present invention is to provide a method for efficiently and highly selectively preparing a composition comprising a perfluoropolyether having a carboxyl group at one terminal at a higher ratio. The present invention provides a method for increasing a ratio of a perfluoropolyether having a carboxyl group at one terminal, relative to a total amount of the perfluoropolyether having a carboxyl group at one terminal and a perfluoropolyether having carboxyl groups at both terminals in a composition comprising these perfluoropolyethers, wherein the method comprises a step of subjecting the composition to chromatography in which a moving phase is supercritical or subcritical state carbon dioxide of the specific temperature and the specific pressure, and a stationary phase is silica gel to thereby collect a fraction containing the perfluoropolyether having a carboxyl group at one terminal at a higher ratio. Further, present invention provides for increasing a ratio of a perfluoropolyether having a carboxyl group at one terminal, relative to a total amount of the perfluoropolyether having a carboxyl group at one terminal, a perfluoropolyether having carboxyl groups at both terminals and a perfluoropolyether having no carboxyl group at any terminal perfluoropolyether, in a composition comprising these perfluoropolyethers, wherein the method comprises a step of subjecting the composition to chromatography in which a moving phase is supercritical or subcritical state carbon dioxide of the specific temperature and the specific pressure, and a stationary phase is silica gel to thereby collect a fraction containing the perfluoropolyether having a carboxyl group at one terminal at a higher ratio. |
申请公布号 |
US2015218311(A1) |
申请公布日期 |
2015.08.06 |
申请号 |
US201514615171 |
申请日期 |
2015.02.05 |
申请人 |
Shin-Etsu Chemical Co., Ltd. |
发明人 |
YAMANE Yuji;SAKANO Yasunori |
分类号 |
C08G65/00 |
主分类号 |
C08G65/00 |
代理机构 |
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代理人 |
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主权项 |
1. A method for increasing a ratio of a perfluoropolyether having a carboxyl group at one terminal, relative to a total amount of the perfluoropolyether having a carboxyl group at one terminal and a perfluoropolyether having carboxyl groups at both terminals in a composition comprising these perfluoropolyethers, wherein the method comprises a step of subjecting the composition to chromatography in which a moving phase is a supercritical or subcritical state carbon dioxide and a stationary phase is silica gel, and the moving phase is at a constant temperature, T, in a range of from 25 degrees C. to 150 degrees C. and a constant pressure, P, in a range of from 7 MPa to 30 MPa to thereby collect a fraction containing the perfluoropolyether having a carboxyl group at one terminal at a higher ratio. |
地址 |
Tokyo JP |