Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2005-05-10
2005-05-10
O'Sullivan, Peter (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C528S170000, C528S125000, C528S128000, C528S172000, C528S173000, C528S176000, C528S179000, C528S183000, C528S185000, C528S188000, C528S220000, C528S229000, C528S350000, C528S353000, C528S174000, C385S141000, C385S142000, C385S143000, C385S144000, C385S145000, C564S315000, C564S443000, C568S586000
Reexamination Certificate
active
06891067
ABSTRACT:
The present invention provides an optical polyimide precursor for use in making a polyimide. The precursor is defined by the following formula:wherein X is Cl, Br, oxo-halide, or fully halogenated alkyl, and A is a divalent aromatic or halogenated aromatic moiety. The present invention provides a method of preparing a diamine compound for use as an optical polyimide precursor. The method includes the steps of dissolving 2-chloro-5-nitrobenzotrifluoride and a diol in N,N-dimethylacetamide to form a solution, adding potassium carbonate, tert-butylammonium chloride and copper powder to said solution and heating the resulting mixture, removing the copper, precipitating and recrystallizing a dinitro-compound resulting from heating the mixture, and dissolving the dinitro-compound and reducing the dinitro-compound to yield a diamine compound.
REFERENCES:
patent: 5296635 (1994-03-01), Kase et al.
patent: 59-189122 (1984-10-01), None
patent: 10-152559 (1998-06-01), None
patent: 2000-297067 (2000-10-01), None
Han Kwan-Soo
Jang Woo-Hyeuk
Kim Eun-Ji
Kim Jung-Hee
Rhee Tae-Hyung
Bushnell , Esq. Robert E.
O'Sullivan Peter
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