JPH0786720A - Electronic photography - Google Patents

Abstract

PURPOSE:To provide the title electronic photography effective for providing a wiring circuit in high resolution but low electric resistivity on a thermal resistant board. CONSTITUTION:In order to provide a wiring circuit on a transfer member by the title electronic photography, as the toner, a conductive material including a metal or oxide thereof is used while as the transfer member, an element mainly comprising talc and a silicofluoride metal is used. Furthermore, this electronic photography can be applied to the image formation in general.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic method, and more particularly, it is particularly useful for making an electric wiring circuit for transferring a conductive toner onto a specific substrate (transfer member), and of course it can be used for general copying. Regarding electrophotography.

[0002]

2. Description of the Related Art Conventionally, as a method of producing an electric wiring circuit, a method of printing a wiring circuit with a conductive ink on a polymer film or a ceramic substrate as an insulating substrate has been the mainstream. In such a conventional printing system, a mask on which an original drawing is drawn is required to create a wiring circuit, and the manufacturing process is complicated, which causes a cost increase. Specifically, in the process of printing the wiring pattern, it was necessary to print using a mask for each layer, and if the wiring circuit was different, a different mask had to be created and used.

However, it is more advantageous in terms of work and cost to perform the electrophotographic method than to form the wiring circuit on the insulating substrate by such a printing method. Many have been proposed as listed in (1) to (9) below. (1) A chargeable powder for a wiring board having a structure in which conductive metal particles are coated with a heat-meltable resin, and a powder of a charge control agent is fixed to the surface of the outer wall thereof (Japanese Patent Laid-Open No. 2-237062). (2) Charge particles for circuit printing in which an organoaluminum compound, a metal powder, and a charge control agent are dispersed in a resin binder (JP-A-4-237063). (3) Charged particles for printing, in which a metal powder and a charge control agent are dispersed in a resin that does not soften at temperature and pressure, and the particles are coated with a resin that softens at temperature (JP-A-4-237064). (4) The charged particles are selected using a specific device. By using this, a circuit with low resistance and high density can be manufactured (Japanese Patent Laid-Open No. 4-237065). (5) A step in which the conductive metal powder, the resin, and the charge control agent are melt-kneaded and crushed one or more times each to obtain a first powder, and the first powder is re-kneaded, crushed and dispersed. To obtain a second powder by a method for producing a chargeable powder for a wiring board (Japanese Patent Laid-Open No. 4-237066). (6) A wiring pattern is transferred and formed on a base material by using a toner made of an active material containing a resin and a metal chloride as a main component (JP-A-54-126959). (7) A circuit board is manufactured by transferring a wiring pattern to a substrate with a toner composed of an active material containing a resin and a metal chloride as a main component, and then plating the wiring pattern (Japanese Patent Laid-Open No. 54-126959). ). (8) 0.05-1.0w of organic solvent in alkaline aqueous solution
A 1,2-quinonediazide-based radiation-sensitive applied developing solution containing t% is used. This is effective as a photoresist in the integrated circuit manufacturing process (Japanese Patent Laid-Open No. 60-15).
8461 publication). (9) A conductive metal powder is transferred onto a flexible printed board coated with an adhesive to manufacture a printed board (Japanese Patent Laid-Open No. 63-88893).

Among these documents, (1) (2) (3)
The items (4) and (5) relate to a method for producing a dry toner using conductive metal particles. Also,
(6) (7) (8) and (9) relate to a method for forming a wiring pattern, a method for manufacturing a circuit board, a radiation sensitive developer, a printed board coated with an adhesive, and the like. In these documents, there is no description regarding a specific transfer member as in the present invention.

Further, the conventional plastic substrate and ceramic substrate have problems that a toner image is not properly transferred in a transfer process in an electrophotographic method, a defect of a wiring circuit is caused, and a conduction failure occurs. It was also low, and crosstalk occurred.

[0006]

SUMMARY OF THE INVENTION The present invention has solved the above-mentioned drawbacks and has the following quality (a), (b), (c) and (d).
It is intended to ensure performance. (A) To faithfully reproduce complicated electric circuits with high resolution of wiring circuits. (B) To prevent defective conduction due to defects in the wiring circuit without causing uneven transfer. (C) Wiring circuits can be created by a simpler method than the conventional printing method. (D) Both the substrate and the conductive toner must be flame resistant.

[0007]

SUMMARY OF THE INVENTION The present invention is an electrophotographic method for developing an electrostatic latent image with a developer by an electrophotographic method and transferring the toner image onto a transfer member, which is particularly effective for producing an electric wiring circuit. It is characterized in that a conductive toner image (including a wiring circuit) containing a metal or an oxide thereof is formed on a transfer member containing talc and a metal fluorosilicate as a main component.

Typical examples of the metal silicofluoride in the transfer member include sodium silicofluoride, potassium silicofluoride, zinc silicofluoride and the like. Further, the transfer member of the present invention can be prepared by applying talc and metal fluorosilicate to a required thickness on paper, plastic film, cellophane, metal surface and the like. On the other hand, typical examples of the metal or oxide thereof in the conductive toner include copper, copper oxide, cuprous oxide, bismuth oxide, aluminum oxide, silver vanadium, platinum, molybdenum, and tungsten. These can be used alone or as a mixture thereof.

Some of the methods for producing the transfer member used in the method of the present invention are as follows. (Production Example-1 of Transfer Member) 85 parts by weight of talc, 12 parts by weight of sodium fluorosilicate and 3 parts by weight of magnesia chloride were mixed well, placed in an electric furnace and heated at 980 ° C. for 4 hours to obtain a powder. It was 15 parts by weight of this heat-treated powder was dissolved / dispersed in 85 parts by weight of water, and then placed in a mold to obtain a transfer member containing water. This is dried at 60 ° C to 100 ° C and a transfer member containing talc and sodium fluorosilicate as the main components (thickness: about 60 µm,
A smoothness of 87 and an electric resistance of 3 × 10 ¹⁴ Ω · cm) were obtained. In addition, the smoothness is the Oken-type smoothness tester (Kumaya Riki Co., Ltd., KY
It is the value measured using -55) (the same applies hereinafter).

(Manufacturing Example-2 of Transfer Member) A transfer member (thickness: about 72 μm, smoothness: 32, electric resistance: 1) was prepared in the same manner except that calcium silicofluoride was used in place of the sodium silicofluoride of Manufacturing Example 1. 0.5 × 10 ¹⁴ Ω · cm) was obtained.

As the electrophotographic toner used in the method of the present invention, there are a dry type electrophotographic toner and a wet type electrophotographic toner, and it is preferable to use a wet type toner. The developer contains a metal or its oxide and a resin as main components, and in some cases, a charge control agent and a dispersion medium are added and kneaded to obtain a toner particle diameter of 0.01 to 10 μm, preferably 0.1 to 5 μm. And This is to improve the resolution and transferability. In the case of dry toner, the particle size is 3 to 15 μm, preferably 5 to 10
μm.

The transfer member according to the present invention is made of talc and metal fluorosilicate, has a high electric resistance, improves transferability of the conductive toner, and obtains high resolution. Also,
The metal or metal oxide of the conductive toner according to the present invention is preferably 0.01 to 10 parts by weight with respect to 1 part by weight of the resin.
If it is less than 0.01 part, the conductivity will be insufficient, and if it is more than 10 parts by weight, the resolution will decrease. Also, the adhesion between the toner layer and the transfer member is poor. Both the transfer member and the toner in the present invention have the advantage that they do not burn even at high temperatures. Of course, the conductive toner in the method of the present invention may be used for ordinary image reproduction.

[0013]

EXAMPLES Next, the method of the present invention will be described more specifically with reference to examples.

Example 1 100 parts by weight of nickel powder and stearyl methacrylate
Methacrylic acid copolymer 100 parts by weight, Isopar L50
0 parts by weight was dispersed with a homomixer for 3 hours to prepare a wet toner. A wet electrophotographic copying machine (Ricoh Co., Ltd., Recopy 5085) was used to make a copy on the transfer member obtained in Production-1. The resolution of this product is 5.6 lines / m.
m, electric resistivity (value measured according to JIS C-3001, the same applies hereinafter) was 12.4 μ · Ω · cm, and had a function as an electric wiring circuit.

Example 2 A conductive toner was prepared by using copper powder instead of nickel powder in Example 1. Then, a copy was made in the same manner as in Example 1. The resolution of this product is 6.3 lines / mm,
The electric resistivity was 3.2 μ · Ω · cm, and it had a function as an electric wiring circuit. Further, it had a quality that was practically no problem when used for general copying.

Example 3 Ten parts by weight of tungsten powder, methylmethacrylate /
2-ethylhexyl methacrylate / maleic acid = 50
A wet toner was manufactured by charging three components of 500 parts by weight of a / 40/10 (wt%) copolymer and 500 parts by weight of Cielsol 71 into an attritor and dispersing them at 250 ° C. for 4 hours. Manufacturing example with an electrophotographic copying machine (Recopy 5085)-
Copies were made to the same transfer member used in 1. The resolution of this product is 7.9 lines / mm, and the electrical resistivity is 1.8 μ · Ω · c.
m, it had a sufficient function as an electric wiring circuit.

Example 4 The transfer member of Production Example-2 was used in place of the transfer member of Production Example-1 in Example 3. As a result, the resolution was 5.6 lines / mm, the electric resistivity was 2.4 μ · Ω · cm, and it had a function as an electric wiring circuit.

Example 5 100 parts by weight of silver vanadium powder and 350 parts by weight of an ethylene / butyl methacrylate = 80/20 (wt%) copolymer were kneaded with a kneader at 120 ° C., and then 130 with two rollers.
Meat smelting and crushing at ℃ for 2 hours, average particle size of about 5.2μ
m dry conductive toner was prepared. When a copy was made on the same transfer member as in Production Example-1 using an electrophotographic copying machine (Ricoh Co., Ltd., Recopy 4060), the resolution was 6.3 lines / m.
m, the electric resistivity was 1.2 μ · Ω · cm, and had a sufficient function as an electric wiring circuit.

Example 6 The transfer member of Production Example-2 was used in place of the transfer member of Production Example-1 in Example 5. As a result, the resolution was 5.0 lines / mm, and the electric resistivity was 1.9 μΩ · cm, which was usable as an electric wiring circuit. In addition, it was confirmed that the image was good as a general copy and that it did not burn even when placed in a fire.

[0020]

According to the first aspect of the present invention, it is possible to manufacture a printed circuit board having a particularly high resolution and a low electric resistivity. According to the invention of claim 2, further improvement in resolution is recognized. According to the invention of claim 3, by using the developer containing the metal or the metal oxide, it is possible to produce a printed circuit board having a low electric resistivity.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidemi Uematsu 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (3)

[Claims] 1. An electrophotographic method in which an electrostatic latent image is visualized with a conductive toner and the image is transferred to a transfer member, the toner containing a metal or an oxide thereof is used,
An electrophotographic method characterized in that talc and a metal fluorinated metal as main components are used as the transfer member. 2. The electrophotographic method according to claim 1, wherein the metal silicofluoride is at least one of sodium silicofluoride, potassium silicofluoride, and zinc silicofluoride. 3. The developer metal or its oxide is copper,
The electrophotographic method according to claim 1, which is selected from copper oxide, cuprous oxide, bismuth oxide, aluminum oxide, silver vanadium, platinum, molybdenum, and tungsten alone or in a mixture thereof.