Benzimidazole-containing sulfonated polyethersulfones

Details Benzimidazole-containing sulfonated polyethersulfones Benzimidazole-containing sulfonated polyethersulfones

2005-10-31

2009-06-16

Truong, Duc (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From sulfur-containing reactant

C528S373000, C528S378000, C528S480000

Reexamination Certificate

active

07547756

ABSTRACT:
Sulfonated polyethersulfones and polymer compositions comprising sulfonated polyethersulfones and at least one inorganic heteropolyacid are useful as proton exchange membranes for fuel cells. The polyethersulfones include structural units derived from at least one biphenol monomer and a monomer of formula Iwherein X is O, S or NR1;Y is N or CR5;R1, R2, R3and R4are independently hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, alkylaryl, substituted alkylaryl, arylalkyl or substituted arylalkyl, orR3and R4, taken together, form a 5- or 6-membered substituted or unsubstituted aliphatic or aromatic ring;R5is hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, alkylaryl, substituted alkylaryl, arylalkyl or substituted arylalkyl; andL is a direct bond or a divalent aromatic linker containing 6-12 carbons.

REFERENCES:
patent: 3294542 (1966-12-01), Süs et al.
patent: 2002/0091225 (2002-07-01), McGrath et al.
patent: 2004/0249117 (2004-12-01), Acar et al.

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