Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Nitrogen-containing reactant
Reexamination Certificate
2001-02-13
2002-05-21
Truong, Duc (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Nitrogen-containing reactant
C528S397000, C528S332000, C528S337000, C528S344000, C528S345000, C528S346000, C528S347000, C528S348000, C528S373000, C528S487000
Reexamination Certificate
active
06392009
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to high performance aromatic heterocyclic polymer compositions.
Rigid-rod benzobisazole polymers have excellent thermal and oxidative stability and solvent resistance. They exhibit superior tensile strength and modulus when fabricated from the liquid crystalline state into film and fiber. Although their mechanical properties (tensile strength and modulus) are far superior to the state-of-the-art, they lack the required compressive strength to be utilized in organic structural composites. We have prepared new benzobisazole polymer compositions based on extended-rod conformations that provide a mechanism for improved compressive properties.
SUMMARY OF THE INVENTION
In accordance with the present invention there are provided benzobisazole polymers having repeating units of the formula
wherein Z is
wherein X is —S—, —O— or —NH—.
REFERENCES:
patent: 5312876 (1994-05-01), Dang et al.
patent: 5312895 (1994-05-01), Dang et al.
patent: 5344896 (1994-09-01), Dang et al.
patent: 5508376 (1996-04-01), Dang et al.
patent: 5521277 (1996-05-01), Tan et al.
patent: 5534613 (1996-07-01), Tan et al.
T.D. Dang, N. Venkatasubramanian, F.E. Arnold, Aromatic Benzobisazole Polymers Based on 1H-Pyrazole, Polymer Preprints, vol. 41, No. 1, Mar. 2000, Published Feb. 22, 2000, pp217-218.
Arnold Fred E.
Dang Thuy D.
Venkatasubramanian Narayanan
Bricker Charles E.
Kundert Thomas L.
The United States of America as represented by the Secretary of
Truong Duc
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