SU720414A1 - Electrophotographic material - Google Patents

Description

The invention relates to material M electrophotography, which can be used to make an electrophotographic film used in the microfilming technique. An electrophotographic material is known, consisting of a polymeric organic semiconductor — poly-N-vinylcarbazole (PVK) and a sensitizer — 2, 4.7-trinitrofluorenone 1). However, this material has greater brittleness and poor adhesion to the substrate. Also known is an electrophotographic material consisting of polyepoxypropylcarbazole and a sensitizer: rhodamine B, auramine, eosin, chloranil, dinitrofluorenone, trinitrofluorenone. This material has a low photosensitivity and a narrow region of spectral sensitivity, not exceeding 600 nm. The aim of the invention is to expand the spectral response. The goal is achieved by using 2-aryl-3-ai.ethyl-1, 4-naphthoquinone series of the general formula COCH, R where RJ, Rg-bromo, hydrogen, chlorine in the amount of wt.% by weight of slo. For sensitization in the long wavelength region, it is proposed to use a mixture of this sensitizer with methylene blue dye in an amount of 7-10 wt.% And 0.05-0.2 wt.%, Respectively. The resulting layers, 4-5 microns thick, are charged up to 200-340 V. negative corona discharge with a voltage of 5 kV. The dark half-time of the layer charging potential is close to the corresponding time for layers based on pure polyepoxypropylcarbazole (PEPC). Layers are sensitive in the region of 380-780 nm. The exposure time of the initial potential of a laser when illuminated with a 100 W incandescent lamp is 200-600 LCS.

Example 1. (93% PEPK and 74 sensitizer).

Application of electrophotographic layer. 0.93 g of polyepoxypropylcarbazole and 0.07 g of 2-phenyl-3-bromoacetylnaphthoquinone-1, 4 are dissolved in 10 ml of toluene. An orange solution is obtained, the solution is poured onto aluminum plates of 20 x 20 mm and dried in vacuum drying equipment at 50 ° C. After evaporation of the solvent, an electrophotographic layer is formed on the surface of the plate in the form of a smooth film. A layer 3–4 µm thick is charged to a 200 V negative HUN (corona when a coronator voltage is 5 kV. The half-life of the initial potential when illuminated with an incandescent lamp is 500 lx-s. Darkness half-life is 250 s. Sensitivity range is 360–680 nm.

Example 2. (93% PEPK and 7% sensitizer).

0.93 g of polyepoxypropylcarbazole, 0.07 G of 2-phenyl-3-acetyl-naphthoquinone-1, 4 are dissolved in 10 ml of toluene. Layers are prepared as in example 1. Layers of 3-4 microns thick are charged up to 250 V with negative corona discharge up to a voltage on the corona electrode of 5 kV. The exposure time of the initial potential when illuminated by a incandescent lamp is 400 lc.

Time - dark half-life 250 sec. Sensitivity range 360-680 nm.

Example 3 (90% PEPK and 10% sensitizer).

0.9 g of polyepoxypropylcarbazole ,, 0.1 g of 2-phenyl-3-bromoacetylnaphthoquinone-1, 4 is dissolved in 10. ml of toluene. The layers are prepared as in Example 1. Layers with a thickness of 6 µm are charged to 340 V by negative corona with a voltage of 5 kV. The exposure is the half-time of the initial potential, when illuminated with a glow lamp of 200 lx; s. The dark half-life is 300 sec. The spectral sensitivity region of the layers is 360–680 nm.

Example 4. (92.95% PEPC + 7% sensitizer + 0.05% dye).

9.295 g PEPC, 0.7 g 2-phenyl-3-bromoacetyl naphthoquinone-1, 4 are dissolved in 110.7 ml of toluene. 0.005 g of methylene blue is dissolved in 2.6 m of dimethylformamide. Solutions are mixed. A solution of green color is obtained. Layers are prepared as in Example 1. The layers are dried for at least one day. After evaporation of the solvent, layers of light green color are obtained. Layers with a thickness of 10 µm are charged with a negative corona voltage of 5 kV. The maximum charging potential is 500 V. The exposure of the initial potential is 300. Time of dark zhluspada 300 sec.

Example 5. (92.9% PEPC + 7% sensitizer + 0.01% dye).

4.645 g PEPC, 035 g 2-phenyl-3-bromoacetyl naphthoquinone-1, 4 are dissolved in 55.3 ml of toluene. 0.005 g of methylene blue is dissolved in p 2.6 ml of dimethylformamide. The solutions are mixed, Get a solution of green color. Layers are prepared and dried, as in Example 1, Layers 10 μm thick are charged with negative corona voltage from 5 kV to 500 V. The exposure time of the initial potential is 200 lx-s. Time; dark half-sleep 200 sec.

Example 6. (92.8% PEPK + 7% sensitizer -: - 0.2% dye).

9.28 g PEPC, 0.7 g 2-phenyl-3-bromo-acetyl-naphthoquinone-1, 4 are dissolved in 110 ml of toluene. 0.02 g of methylene blue is dissolved in 2 ml of dimethylformamide. The solutions are mixed. Get a solution of dark green color. Layers 4-5 µm thick are charged with a negative corona voltage of 5 kV to 300 V. The half-life of the initial potential is 400 lux: s. Dark half-time 200 sec.

Thus, the proposed material has a photosensitivity greater than: - a photosensitivity of a known material 80–400 times, and a range of spectral sensitivity expands to 780 nm. Due to the ductility and low softening temperature, the proposed material is suitable for photothermoplastic recording.

Claims (2)

1. Electrophotographic material made up of a substrate and a layer of organic photoconductor polyepoxypropylcarbazole with a sensitizer, characterized in that, in order to increase photosensitivity and expand the spectral characteristics, 2-aryl-3-acetyl-1, 4-naphthoquinone p is used as sensitizer Yes, the general formula where RJ, Rg is bromine, hydrogen, chlorine; in the amount of 7-10 weight,% by weight of the layer, 2. The material in claim 1. about tl and h ayu and with the fact that sensitization in the long-wavelength region of the spectrum, it additionally contains the dye methylene blue, with coarse  7204144 the ratio of the components of sensibili-Sources of information congestion (wt.%) 1prints in the examination 2-aryl-3-acetyl-1,4-naphthoquinone range 7-101. USSR author's certificate Methylene dye number 503200, cl. C 03 C 5/06, 1972 (with a blue skin 0.05-0.2..5 totip).