JPH0250464B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a photoreceptor belt used in an electrostatic recording device and carrying charges for transfer, and a non-photosensitive dielectric belt called an electrostatic copy master. The present invention relates to a method of manufacturing such an electrostatic recording transfer belt.

[Conventional technology]

An electrostatic recording transfer belt is made by laminating a conductive layer or depositing a thin metal film on the surface of a synthetic resin sheet, then forming a photoconductive layer or dielectric layer on top of that, and then butting and connecting both ends. or are formed by overlapping and connecting.

[Problem that the invention seeks to solve]

In the above-mentioned conventional method, it takes time to connect, laminate, and vapor-deposit the material to make it endless, and the adhesion between the layers has a large effect on the service life.

The present invention attempts to solve these problems by simultaneously and integrally molding a synthetic resin base material and a conductive layer in an endless manner.

[Means for solving problems]

In the present invention, a mixture of a thermosetting resin dissolved in a volatile solvent and conductive fine powder is injected into a cylindrical mold, and centrifugally molded while heating to form a belt with a conductive layer formed on one side. The purpose is to form a photoconductive layer or a dielectric layer on the surface of the conductive layer of the belt.

The conductive fine powder used is carbon,
Fine powder of copper, silver, etc. is used. As the thermosetting resin, polyimide resin, polyamideimide resin, polybenzimidazole resin, etc. are used. As the photoconductive layer, inorganic photoconductive materials such as selenium, cadmium sulfide, and amorphous silicone, and organic photoconductive materials such as polyvinylcarbazole are used. As the dielectric layer, polyester resin, polycarbonate resin, acrylic resin, silicone resin, fluororesin, etc. are used.

The conductive layer is approximately 10 μm thick and has a resistance of 1×10 ^-8 Ω ^-1 cm ^-1
It is fine as long as it has an electrical conductivity of at least
Any desired shape can be made depending on the amount of conductive fine powder mixed into the thermosetting resin and the acceleration applied to the molded product during centrifugal molding.

〔Example〕

As shown in the figure, a box-shaped heating jacket 1 whose outer periphery is covered with a heat insulating layer 3 and has a passage 2 for heating fluid inside, and whose opening can be closed with a lid 4.
One end of a rotating shaft 6 provided to be rotated by a motor 5 is penetrated through the bottom of the heating jacket 1 into the heating jacket 1, and one end of a cylindrical mold 7 is fixed to one end of the rotating shaft 6 using a centrifugal molding device. An electrostatic recording transfer belt was manufactured.

While rotating a cylindrical mold 7 with an inner diameter of 100 mm and a length of 400 mm at 1000 rpm, 20 g of a fully aromatic imide varnish (manufactured by Toray Industries, trade name: Trenice #2000) containing N-methyl-2-pyrrolidone as its main component, N, A mixture of 4 g of carbon black powder (manufactured by Tokai Carbon Co., Ltd., trade name SEAST SO) with an average particle size of 55 μm dissolved in 150 g of the above varnish solvent containing N-dimethylacetamide etc. was poured into the solution, and the mixture was heated to the ambient temperature. The temperature was raised to 120-130°C and centrifugal molding was performed for 30 minutes. After stopping the rotation, the belt was taken out from the cylindrical mold 7 and heated at 300° C. for 30 minutes to complete curing. The resulting belt is 100 μm thick with one side thicker than the other.
The 10 μm thick layer is made of carbon black powder mixed in to form a conductive layer, and the 90 μm thick layer on the other side is
It was a substantially non-conductive polyimide resin layer. The conductivity of the conductive layer was measured and was found to be 2×10 ⁻⁴ Ω ⁻¹ ·cm ⁻¹ . Selenium was vacuum-deposited on the surface of this conductive layer to form a selenium photoconductive layer with a thickness of 30 μm, thereby producing a photoreceptor belt.

In addition, the surface of the conductive layer of the belt was spray-coated with a fluororesin dispersion (trade name: NEOFLON FFP, manufactured by Daikin Industries, containing 50% by weight of tetrafluoroethylene-hexafluoroethylene copolymer) to form a 40 μm thick film. A thick dielectric layer was formed to create a non-photosensitive dielectric belt.

〔Effect of the invention〕

According to the method of the present invention, the base belt layer and the conductive layer can be integrally manufactured at the same time, and a joining process is not required, so that an electrostatic recording transfer belt can be provided at a low cost.

[Brief explanation of the drawing]

The drawing is a sectional view of a centrifugal molding device used in an example. DESCRIPTION OF SYMBOLS 1... Heating jacket, 2... Heating fluid passage, 3... Heat retention layer, 4... Lid, 5... Motor,
6...Rotating shaft, 7...Cylindrical type.

Claims (1)

[Claims] 1. A mixture of a thermosetting resin dissolved in a volatile solvent and conductive fine powder is injected into a cylindrical mold, heated and centrifugally molded to form a belt with a conductive layer formed on one side. 1. A method for producing an electrostatic recording transfer belt, comprising forming a photoconductive layer or a dielectric layer on the surface of the conductive layer.