Radiation imagery chemistry: process – composition – or product th – Producing cathode-ray tube or element thereof
Reexamination Certificate
1999-08-23
2001-12-04
Rodee, Christopher D. (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Producing cathode-ray tube or element thereof
C430S023000, C430S062000, C430S131000
Reexamination Certificate
active
06326110
ABSTRACT:
The invention relates to a method of electrophotographically manufacturing a luminescent screen assembly for a cathode-ray tube (CRT) and, more particularly, to a method in which improved materials are used to provide an organic conductive (OC) layer which acts as an electrode for an overlying organic photoconductive (OPC) layer. The improved organic conductive (OC) layer has superior physical and electrical properties compared to prior organic conductive (OC) layers.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,405,722, issued to Datta et al. on Apr. 11, 1995, describes an ionic conductor, Luviquat MS 905, manufactured by BASF Corp., Mt. Olive, N.J., as the copolymer used in formulating an organic conductor (OC) for an electrophotographic screening (EPS) process. The ionic conductor is satisfactory for its intended purpose; however, the conductivity of the material is humidity and temperature sensitive. Thus, the need exists for a conductor that is insensitive to humidity and temperature, and has electrical conductivity at least equal to that of the Liquivat MS 905, which is hereafter designated OC-8.
SUMMARY OF THE INVENTION
In accordance with the present invention, a method of electrophotographically manufacturing a luminescent screen assembly on an interior surface of a faceplate panel of a color CRT includes the steps of coating the surface of the panel with a conductive solution to form a volatilizable organic conductive layer, and overcoating the organic conductive layer with a photoconductive solution to form a volatilizable photoconductive layer. The conductive solution comprises the organic polymer 3,4-polyethylene dioxythiophene polystyrene sulphonate (PEDT/PSS); a polymer or co-polymer to reduce organic residue selected from the group consisting of polyvinylpyrrolidone (PVP), poly (vinyl pyridine-co-vinyl acetate) (PVPy-VAc), polymethacrylic acid (PMAA), poly (hydroxyethylacrylate-co-methacrylic acid) (PHEA-MAA) and poly (2-hydroxyethyl methacrylate) (PHEMA), polyvinylbutyral (PVB); and a suitable solvent.
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patent: 00/05625 (2000-02-01), None
Cohee Gregory James
Colbert Steven Anthony
Datta Pabitra
Desai Nitin Vithalbhi
Gerofsky Diane
Gerofsky Diane
Herrera Carlos M.
Irlbeck Dennis H.
Rodee Christopher D.
Thomson Licensing S.A.
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