SU935865A1 - Electrophotographic material - Google Patents

Description

(54) ELECTROPHOTOGRAPHIC MATERIAL

I

The invention relates to electrophotography and relates to an electrophotographic material used to produce an electrostatic image.

An electrophotographic element made in the form of a plate or cylinder and photoprofile of this insulating layer is used to form an image by uniformly charging the surface followed by exposure to activating electromagnetic radiation capable of selectively dissipating the charge on the illuminated portions of the photoconductively insulating layer while preserving the charge on the unlighted participantsCTKax. Ti by the appearance of the latent electrostatic image by the deposition of finely ground electroscopic images the properties of the photoconductive insulating layer.

An electrophotographic material is known that contains a bristle selenide layer deposited in vacuum on an electrically conductive substrate, which consists of this.

that the substrate is heated to 14 ° –280 ° C and then cooled at a rate of 1–5 ° C / min. As a result of this, the charging potential of the photosensitivity of the material increases in the entire white spectral region of Cl.

The disadvantages of this material are the greater rate of dark decay of positive potential and the lack of photosensitivity with a negative

10 surface charge.

An electrophotograph (}) is also a known material consisting of an electrically conductive substrate and. a layer of organic ph {tofvovnika poly-N-epoxypropylcarba-15 ash with a sensitizer. The use of compounds of the 2- ari; l-3-adhetil-1,4-naphthoquinone series as a sensitizer leads to an increase in photosensitivity and the expansion of its spectral range in the range of 380-78 O nm 2. The disadvantages of this material are low integrated sensitivity at from The potential potential and the absence of a photo-to-horizontal engine with a positive flux at the indicated spectral region. The closest to the one proposed is an electrophotographic material consisting of a flush layer and a layer of poly-N-epoxy-progolgcarbdzola with organic dye sensitizers, an electron o-acceptor, or other semiconductor substances. The material is charged positive and negative.

charges, has good elastic properties, improved adhesion to the substrate and SZ flexibility.

The disadvantages of the material are nyeka photosensitivity and a narrow spectral sensitivity region. In addition, in the process of repeated use, its photoconductive surface is exposed to the environment, in particular, it perceives abrasion, multiple chemical, thermal, electrical and light scenes, as a result of which the electrical characteristics of the photoconductive layer are impaired. The purpose of the invention is to increase the photosensitivity in the spectral region of ZOO78Onm both with positive and negative charge with a simultaneous increase in the strength of the material. The goal is achieved by the fact that an electrophotographic material consisting of an electroconductive substrate and a photoactive element deposited on it, dispersed in poly-M-epoxypropylcarbazole, as a photoactive element of the mouse arsenic triaselide in the following ratio of components, wt.%: Trielenide mouse 1O-6O Poly-N-epoxypropylcarbazole 50-90 As a photoactive element, it may contain a triplennya mouse with, mixture of thallium, tellurium, sulfur and / or antimony in the amount of O, OljO, 5 wt.%. FIG. I shows the electrophotographic material in the form of a plate; in fig. 2 - the spectral distribution of the photosensitivity of the proposed material. The electrophotographic material consists of an electrically conductive substrate 1 and a photoconductive layer 2, which contains particles of finely ground photoactive element 3 dispersed in g of electrically active material nc-N-epoxypropylcarbazole 4. The spectral distribution of photosensitivity of the proposed material with a positive (curve 1 and negative

Claims (3)

both at the interface with the electro-active substance poly-N-epoxypropylcarbazole due to the injection of charge carriers into the electroactive element. 54 (curve 2) charges (Fig. 2) are measured by the half-life of the initial potential with a constant number of quanta of monochromatic light. The essence of the invention is that an increase in photosensitivity in a wide spectral range is caused by highly efficient absorption of light and photogeneration of charge carriers that occur as photoactive elements in particles. The increase in the mechanical strength of the material is due to the good interconnection of the finely ground photoactive element with an electroactively coupled substance. In addition, the strength to e-spektricheskoy impact caused by an increase in the electrical resistance of the material. A substrate 1 of any suitable material, such as aluminum, steel, brass and copper, is recommended. Substrate i can be rigid or flexible and have any desired thickness. Typical liners include flexible belts, sheets, strips, plates, cylinders, and the like. The substrate may be of metallized paper, as well as a sladasty, consisting of plastic, covered with a thin layer of aluminum or copper oxide, or glass, covered with a thin layer of chromium or tin oxide. As a photoactive element 3, arsenic triselenide or he is used with impurities of thallium, tellurium, sulfur or antimony in the amount of O, O1-O, 5 wt.%, Whose particles, with a size in the range 0, O I - 2, About μm, cispergirseanes in poly-N-epoxypropylcarbazole 4. The thickness of the photoconductive layer 2 should be in the range of 3-10 O μm, preferably 5-50 μm. PRI me R I. A glassy alloy of mouse triselenide is ground in a micromelon for 30 minutes, sieved through a sieve and powder is obtained, the particle size of which is O, 01–2.0 µm. A 2.5 g sieved powder of powdered amount is mixed with 25 g of a 20% solution of pop-N-epoxypropylcarbazole in toduol and dispersed in a mill for 1 hour. The resulting suspension is applied on O, O5 mm copper foil and dried in a thermostat 2O-30. min at 6 ° -65 ° C. The photoconductor layer with a thickness of 4–5 µm is charged to 35 OV of positive charge and 150 V of negative charge. FIG. Figure 2 shows the spectral resolution of the photosensitive material of the material on positive and negative charges. The exposure time of the initial positive potential when illuminated by incandescent lamp light is 3 lx, and the negative potential is 6 lx. The half-time of the potential potential in the dark is 90 s, the negative one is 30 s. EXAMPLE 2 An elactic photographic material was prepared analogously to example 1, except that three selenide arsenic with admixture of thallium or tellurium in an amount of 0.2 wt.% Were used as the photoactive element. Powdered powder in an amount of 1, 5 g are mixed with 25 g of a ZO% PEPC solution and toluene is dispersed in a mill for 4O minutes. A photoconductor layer with a thickness of 8–9 µm deposited on a substrate and dried in a thermostat is positively charged up to 500 V and negative to 3OO B. Exposure for the positive potential is 6 lux, and negative - 10 lux. The half-life of the positive potential in the dark is 6 O s, and the negative one is 40 s. The photosensitivity region of the ZOO is 780 nm, both with positive and negative charge. Example 3, Electrographic material is obtained in the same way as Press 1, except that as a photo. a mixture of arsenic triselenide in an amount of 95 wt.% and antimony trilenite in an amount of 5 wt.% are used in the active element. Grinding of glassy alloys takes place in a micromill at the same time, with stirring for 1.5 hours. The manufactured photoconductor layer with a thickness of 3-4 µm is charged to a positive potential of 250 V and negative - 100 V. The exposure half-life is positive charge 2.5 lx, negative 5.5 lx. Photosensitivity area ZOO-78 O nm for both fields charge The U / 1 photovoltaic properties of electrophotographic material are related to the fact that, compared to the known MI layers based on poly-N-epoxypropylcarbazole, the spectral region increases and the sensitivity to the integral light increases from 30 to 30 OO, depending on polarity and the magnitude of the charge due to the highly efficient generation and transportation of charge carriers in the photoconductive layer. The increase in strength is due to the high microhardness of the mouse triseli- nica and the coupling of the material components, as well as an increase in the dielectric constant of the photoconductive layer by 1.21, 8 times. At the same time, elastic and adhesion properties, which are necessary for view-efficient media, are preserved, so that information is recorded on a flexible basis. Claim 1. Electrophotographic material consisting of an electro-absorbing substrate and a photoactive element deposited on it, dispersed in a poly-N-epoxypropylcarbazole, characterized in that, in order to increase photosensitivity in the ZOO-78 O range. at a negative charge with a significant increase in the strength of the material, and as a photoactive element contains mouse tselenenide with the following ratio of components, wt.%: Mouse trilene ka1O-5O Poly-N-epoxypropyl arbazol 5O-9O 2. The material according to claim 1, characterized in that it contains as a photoacting element triple mice with impurities of thallium, tellurium, sulfur 1I / OR, oryomas in an amount of 0.01%, 5% by weight , Sources of information taken into account when executing 1. Authors' certificate of the USSR | M “245555, cl. G OZ Q 5 / O82, 1966. 2. USSR author's certificate number 720414, cl. Q 03 Q 5 / O6, 1977. 3. USSR author's certificate N 5O32OO, cl. Q OZ Q 5 / O6, 1972 (prototype). FIG. 5l. nV t 90 60 thirty 300 400 500 600 700 A.nm FIG. 2