Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2009-08-19
2011-12-06
Boykin, Terressa (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C528S128000
Reexamination Certificate
active
08071710
ABSTRACT:
The manufacture of polyetherquinoxalines may be accomplished by polymerization of quinoxaline and related monomers with a bisphenol under aromatic nucleophilic substitution reaction conditions. A method of manufacture includes contacting a substituted or unsubstituted quinoxaline having replaceable groups at the 2,3 positions with a bisphenol or a bisphenol derivative under aromatic nucleophilic substitution reaction conditions. The resulting polyetherquinoxalines contain quinoxaline groups joined by ether linkages at the 2 and 3 positions of the quinoxaline groups. In one example, the polyetherquinoxaline has a formula represented aswherein “n” is an integer from 1 to 10000, and R1, R2, R3, R4are independently hydrogen, methyl, CF3, tert-butyl, benzoyl, benzenesulfonyl, a sulfonic acid salt, an aliphatic group, an alicyclic group, or an aryl group, and Ar is an aromatic radical. These melt-processable polyetherquinoxalines can be prepared under relatively mild conditions, have excellent thermal and mechanical properties, and are organo-soluble, transparent and colorless thermoplastics.
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Erdem Haci Bayram
Harris Frank Wayne
Boykin Terressa
Renner Kenner Greive Bobak Taylor & Weber
The University of Akron
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