Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Nitrogen-containing reactant
Reexamination Certificate
2005-03-08
2005-03-08
Truong, Duc (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Nitrogen-containing reactant
C528S422000, C528S425000, C528S274000, C428S690000, C428S917000, C427S066000
Reexamination Certificate
active
06864352
ABSTRACT:
This invention discloses a class of soluble poly(arylene-oxadiazole) polymers and copolymers comprising at least 20 repeat units, which may be the same or different, represented by the formula:wherein Arom can be a fluorene group, an aromatic hydrocarbon ring, an aromatic C2+heterocyclic ring, or two aromatic rings linked by a single bond, ethenyl bond, or ethynyl bond. A process for preparing the polymers and copolymers by reacting dicarboxylic acids and hydrazine salt is provided. The polymers are useful in electroluminescent devices, photovoltaic cells, and diodes.
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Srdanov Gordana
Wang Hailiang
Yu Gang
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