Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From sulfur-containing reactant
Reexamination Certificate
2008-07-01
2008-07-01
Gulakowski, Randy (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From sulfur-containing reactant
C528S128000, C528S125000, C528S171000, C528S174000, C528S175000
Reexamination Certificate
active
07393914
ABSTRACT:
Novel polyethersulfone compositions have been discovered which incorporate structural subunits derived from sulfonated bis(halophenyl)sulfones, dihydroxy terphenyls, and/or bis(hydroxyphenyl)pyridines. The sulfonated polyethersulfones show promise as materials for use in polymer electrolyte membranes (PEMs) in fuel cells owing to their high proton conductivities (0.02-0.07 S/cm at 20° C. and 100 percent humidity). In addition, a novel unsulfonated thermoplastic polyethersulfone comprising structural subunits derived from a non-sulfonated bis(halophenyl)sulfone bis4-fluorophenyl)sulfone and 4,4′-dihydroxyphenyl-2,6-pyridine (CAS No. 171820-16-9) is disclosed.
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Brunelle Daniel Joseph
Harmon Marianne Elisabeth
Hung Joyce
Liu Hongwei
Moore David Roger
Caruso Andrew J.
General Electric Company
Gulakowski Randy
Powell William E.
Toscano Alicia
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