The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2007
Filed:
Jun. 07, 2003
Harumi Takabatake, Sakaide, JP;
Tsutomu Nosu, Sakaide, JP;
Harumi Takabatake, Sakaide, JP;
Tsutomu Nosu, Sakaide, JP;
Kyowa Chemical Industry Co., Ltd., Kagawa, JP;
Abstract
A process for purifying a crude polyether, comprising contacting a crude polyether obtained by addition polymerizing an active hydrogen-containing compound with an alkylene oxide compound in the presence of an alkali metal-containing basic catalyst to an adsorbent comprising a synthesized hydrous magnesium silicate compound which satisfies the following requirements (1) to (5) in order to reduce the alkali metal content of the crude polyether: (1) it is represented by the following formula I:(CaO).(MgO).(AlO).SiO.mHOIwherein x, y, z and m satisfy the following ranges:x<y, z<y, 0≦x≦0.1, 0.6≦y≦0.6, 0≦z≦0.1 and 0.1≦m≦1.5, (2) it is amorphous according to the analysis of its powder method X-ray diffraction diagram, (3) it has a BET specific surface area of 100 to 400 m/g, (4) it has an alkali metal content of 0.1 wt % or less, and (5) it has an average particle diameter of 2 to 60 μm. According to the present invention, a purified polyether having an extremely low content of an alkali metal can be obtained effectively.