Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Nitrogen-containing reactant
Reexamination Certificate
2006-05-09
2006-05-09
Truong, Duc (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Nitrogen-containing reactant
C528S422000, C528S176000, C528S205000, C528S211000, C528S219000, C528S272000, C528S274000, C528S361000
Reexamination Certificate
active
07041779
ABSTRACT:
A benzobisazole polymer having repeating units of the formula:wherein Q isand wherein Z is —O—, —S— or —NH—. A new method for preparing 1,5-naphthalenedicarboxylic acid from 1,5-diaminonaphthalene under relatively mild conditions in good yields is also described.
REFERENCES:
patent: 4533724 (1985-08-01), Wolfe et al.
patent: 4762908 (1988-08-01), Tsai et al.
T. D. Dang, N. Venkatasubramanian, A. Talicska, S-Y Park, F. E. Arnold, Synthesis and Characterization of Rigid-Rod Benzobisazole Polymers Incorporating Naphthalene 2,6- and 1,5-Diyl Structural Units, Polymer Preprints 2002, 43(1), 660-661, published Apr. 2002.
S-Y Park, J. Lee, N. Venkatasubramanian, T. D. Dang, F. E. Arnold, B.L. Farmer, Structural Studies on Naphthalene Based Rigid-Rod Benzobisthiazole Polymers, Polymer Preprints 2002, 43(1), 248-249, published Apr. 2002.
Arnold Fred E.
Dang Thuy D.
Farmer Barry L.
Lee Jar-Wha
Park Soo-Young
AFMCLO/JAZ
Hersko Bart S.
The United States of America as represented by the Secretary of
Truong Duc
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