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Title:
METHOD FOR PRODUCING POLYSULFONE HAVING REDUCED AMOUNT OF CONTAINED HALOGENS
Document Type and Number:
WIPO Patent Application WO/2012/133641
Kind Code:
A1
Abstract:
The problem addressed by the present invention is to produce a polysulfone that has a low amount of contained halogens and that resists an increase in melt viscosity during melt processing. The present invention pertains to a method for producing a polysulfone having a reduced amount of contained halogens by: heating to a predetermined temperature a mixture containing a halogen-terminated polysulfone, a basic compound, and a solvent; admixing a metal compound that generates water at the predetermined temperature; and then admixing an alkylating agent and/or an aralkylating agent. Preferably, an alkali metal salt of carbonic acid is used as the basic compound; preferably, an aprotic solvent is used as the solvent; and preferably, a metal hydroxide is used as the metal compound that generates water.

Inventors:
HARADA HIROSHI (JP)
Application Number:
PCT/JP2012/058343
Publication Date:
October 04, 2012
Filing Date:
March 29, 2012
Export Citation:
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Assignee:
SUMITOMO CHEMICAL CO (JP)
HARADA HIROSHI (JP)
International Classes:
C08G75/20
Foreign References:
JP2007504299A2007-03-01
JP2002519458A2002-07-02
JPH01245018A1989-09-29
JPH01315421A1989-12-20
JPH01315422A1989-12-20
JPH0341120A1991-02-21
JPH05156015A1993-06-22
JPS5316098A1978-02-14
JPH07173394A1995-07-11
JP2009541508A2009-11-26
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
Mutsumi Sameshima (JP)
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