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Patent Searching and Data


Title:
METHOD FOR PRODUCING POLYETHER SULFONE
Document Type and Number:
WIPO Patent Application WO/2013/015366
Kind Code:
A1
Abstract:
The present invention relates to a method for producing polyether sulfone in which a dihalogenodiphenyl sulfone and bisphenols undergo a polycondensation reaction in a polymerization tank in the presence of an alkali metal salt in a first solvent, and the polymer is removed from the polymerization tank at a point in time where the polymer in the polymerization tank has reached a predetermined viscosity, the method being characterized in that as the polycondensation reaction progresses, a second solvent is added and stirred in at the point in time when the polymer in the polymerization tank reaches the predetermined viscosity, and also the stirring is stopped within T × 0.25 (a duration of time) (where T is the total duration of time from the start of removal until the end) from the start of the removal of the polymer from the polymerization tank. The polyether sulfone obtained by this method of production can be used in a broad range of applications not limited to membranes for artificial dialysis, but also including electrical and electronic components, automobiles, medicines, food products, coating materials, and the like.

Inventors:
OHTA CHIKARA (JP)
Application Number:
PCT/JP2012/068984
Publication Date:
January 31, 2013
Filing Date:
July 26, 2012
Export Citation:
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Assignee:
SUMITOMO CHEMICAL CO (JP)
OHTA CHIKARA (JP)
International Classes:
C08G65/40
Foreign References:
JP2010222506A2010-10-07
JPH01103624A1989-04-20
JP2009185250A2009-08-20
JP2007238890A2007-09-20
Attorney, Agent or Firm:
UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)
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Claims: