PROCESS FOR PURIFICATION OF CRUDE POLYETHER AND ADSORBENT

WIPO Patent Application WO/2003/106535

A1

A process for purification of crude polyether, characterized by bringing a crude polyether obtained by addition polymerization of an active hydrogen compound with an alkylene oxide in the presence of an alkali metal-containing basic catalyst into contact with an adsorbent consisting of a synthetic hydrous magnesium silicate compound satisfying the following requirements (1) to (5) to thereby lower the alkali metal content of the crude polyether: (1) it is represented by the general formula (I): (CaO)_x (MgO)_y (Al₂O₃)_z SiO₂ mH₂O ... (I) wherein x, y, z and m satisfy the following relationships respectively: x < y, z < y, 0 ≤ x ≤ 0.1, 0.06 ≤ y ≤ 0.6, 0 ≤ z ≤ 0.1, and 0.1 ≤ m ≤ 1.5 (2) it is amorphous as determined by powder X-ray diffractometry, (3) the specific surface area is 100 to 400 m²/g as determined by BET absorption method, (4) the alkali metal content is 0.1 % by weight or below, and (5) the mean particle diameter is 2 to 60 μm. According to the invention, purified polyethers little containing alkali metals can be efficiently produced.

TAKABATAKE HARUMI (JP)
NOSU TSUTOMU (JP)

PCT/JP2003/007685

December 24, 2003

June 17, 2003

Click for automatic bibliography generation  

KYOWA CHEM IND CO LTD (JP)
TAKABATAKE HARUMI (JP)
NOSU TSUTOMU (JP)

B01J20/10; B01D15/00; B01J20/16; B01J20/30; C01B33/22; C07C41/03; C07C41/36; C07C43/11; C08G65/26; C08G65/30; (IPC1-7): C08G65/30; B01J15/00; B01J20/10; C01B33/26

JPH07258403A	1995-10-09
JPH04362011A	1992-12-15
JPH0264007A	1990-03-05

Ohshima, Masataka (Fukuya Bldg. 3, Yotsuya 4-chom, Shinjuku-ku Tokyo, JP)

View/Download PDF      PDF Help

Previous Patent: METHOD FOR PRODUCING POLYETHER ALCOHOLS

Next Patent: HEAT-SENSITIVE POLYMERS AND HEAT REVERSIBLE GELS DERIVED THEREFROM