Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2005-04-19
2005-04-19
Woodward, Ana (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C525S423000, C523S339000, C523S340000
Reexamination Certificate
active
06881820
ABSTRACT:
This invention is a series of rod-coil block polyimide copolymers that are easy to fabricate into mechanically resilient films with acceptable ionic or protonic conductivity at a variety of temperatures. The copolymers consist of short-rigid polyimide rod segments alternating with polyether coil segments. The rods and coil segments can be linear, branched or mixtures of linear and branched segments. The highly incompatible rods and coil segments phase separate, providing nanoscale channels for ion conduction. The polyimide segments provide dimensional and mechanical stability and can be functionalized in a number of ways to provide specialized functions for a given application. These rod-coil black polyimide copolymers are particularly useful in the preparation of ion conductive membranes for use in the manufacture of fuel cells and lithium based polymer batteries.
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Katsuya Asao and Motonori Mitoh, Polyimides (containing ether linkages; Adhesive Properties), in Concise Polymeric Materials Encylcopedia, 1202 (Joseph C. Salamone ed., CRC Press 1999).
Kinder James D.
Meador Mary Ann B.
Stone Kent N.
The United States of America as represented by the Administrator
Tura James V.
Woodward Ana
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