Process for preparing polysulfone
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United States of America Patent
Stats
-
Jul 28, 2015
Grant Date -
Aug 7, 2014
app pub date -
Sep 24, 2012
filing date -
Sep 23, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention relates to a process for preparing polysulfone, comprising reacting bisphenol monomers with a salt forming agent to form bisphenolate, followed by subjecting the bisphenolate and 4,4′-dihalodiphenyl sulfone to polycondensation to give polysulfone, characterized in that the reaction for forming bisphenolate and the polycondensation are performed in the presence of a composite ionic liquid as the solvent, the composite ionic liquid containing zwitterionic liquid of formula (I) and/or (II) as component A and ionic liquid of formula (III) and/or (IV) as component B, wherein variables are respectively defined in the description of the present invention. The process of the present invention enables a shortened preparation period of polysulfone, particularly a shortened reaction time (including the time of water removal) of the salt forming stage; in addition, the polysulfone thus prepared has an improved molecular weight which is much higher.
First Claim
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International Classification(s)
- 2012 Application Filing Year
- C08G Class
- 2008 Applications Filed
- 1741 Patents Issued To-Date
- 86.71 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C08G Class
- 0 % this patent is cited more than
- 10 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jan 28, 2027 |
