JPH0389359A - Functional toner for circuit wiring and production thereof - Google Patents

Abstract

PURPOSE:To allow the maskless formation of circuit wiring patterns by incorporating a binder resin and conductive metallic particles into the toner. CONSTITUTION:The toner for forming the circuit wiring patterns is formed of at least the binder resin and the conductive metallic particles consisting of gold, silver, palladium, platinum, copper or nickel along or a mixture composed of the metals selected form >= 2 kinds thereof. Since the conductive metallic particles are incorporated as the compsn. of the toner for developing electrostatic charge images in this case, the maskless formation of the circuit wiring patterns by a sintering stage is executed after the circuit wiring patterns are formed on a green sheet consisting of a ceramic substrate and ceramic powder by using an elecatrophotographic technique. The need for a mask for exposing and screen mask is eliminated in this way and there is no possibility of the clogging during printing in the case of a screen printing method. Further, the need for setting the various conditions of a printing machine and the viscosity adjustment of paste is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrostatic charge developing toner for forming an electronic circuit wiring pattern by electrophotography and a method for producing the same.

(Prior Art) With the dramatic progress of the semiconductor industry, ICs and LSIs have come into wide use. These ICs.

Ceramic substrates or printed circuit boards on which circuit patterns are formed are used to mount LSIs. A method for forming a circuit pattern on a ceramic substrate is, for example, printing a conductive paste on a fired alumina substrate by screen printing and heat-treating it at a temperature of about 850°C. Here, a screen mask corresponding to the circuit pattern must be used during printing.

For printed circuit boards, resist is applied to copper foil, exposed to light using a mask, and developed to etch everything other than the circuit pattern.

In the above method, as the material for forming the circuit pattern, a conductive paste containing a mixture of conductive metal particles, a binder, and an organic vehicle consisting of an organic solvent is used, or copper foil is used.

On the other hand, the conventional electrophotographic toner technology is shown below.

The method for forming an electric latent image is usually to charge a photoconductor layer and then irradiate it with a light image based on an original, thereby reducing or eliminating the electrostatic charge in the light-irradiated area to form an electrostatic latent image. This latent image is then developed with a developer called toner. Dry development methods can generally be classified into two types based on the composition of the developer: -component development methods and two-component development methods. - The component development method basically forms an image using only toner particles, and the two-component development method uses a developer consisting of a carrier and toner to form an image.

The toner used in the two-component development method is usually limited to binder resin, colorant, etc.

(Problems to be Solved by the Invention) Changing the conventional circuit wiring pattern requires replacing the exposure mask and screen mask, and in the case of screen printing, clogging occurs during printing. There have been disadvantages in that it is extremely difficult to set printing machine conditions and adjust paste viscosity. Printed circuit boards, on the other hand, have the drawbacks of complex processes, long manufacturing times, and high manufacturing costs.

Therefore, we developed a method for forming disconnection patterns using electrophotographic technology, but conventional toner compositions for electrostatic charge development do not contain any conductive metal materials and are impossible to form electronic circuits. there were.

(Means for Solving the Problems) The present invention eliminates the drawbacks of the prior art described above, and provides a conductor that does not require scientific treatments such as etching, and does not use pattern masks or pastes used in screen printing machines. It is an object of the present invention to provide a functional toner composition and a manufacturing method that can form a circuit wiring pattern that can cope with the polarization of the pattern without a mask.

The present invention also provides a toner for forming a circuit wiring pattern using electrophotographic technology, which is made of at least a binder resin and conductive metal particles of gold, silver, palladium, platinum, copper, and nickel alone or in a mixture of two or more of them. This is a functional toner with an average particle diameter of 1011 m or less.

Further, in the production of the functional toner, the binder resin and the conductive metal particles are heated and kneaded, the mixture is then coarsely pulverized and finely pulverized, and the fine powder particles are classified.

(Function) Since the composition of the toner for electrostatic charge development includes conductive metal particles, the present invention uses electrophotographic technology to form a circuit wiring pattern on a ceramic substrate and a green sheet made of ceramic powder, and then bakes it. Electronic circuit wiring can be formed through the bonding process.

Furthermore, using electrophotographic technology not only eliminates the need for exposure masks and screen masks, but also prevents problems such as clogging during printing, printing machine conditions, paste viscosity adjustment, etc. in the case of screen printing. The discomfort can be resolved. Furthermore, unlike printed circuit boards, there is no cumbersome and time-consuming chemical treatment process such as etching, which is advantageous in terms of cost.

In addition, by adopting a method of directly electrophotographing electrical signals to form circuit patterns, it becomes possible to form patterns that are displayed graphically on a computer, and CAD
Designing and changing conductor circuit patterns using the system becomes extremely easy.

Therefore, it is possible to realize an automatic manufacturing line that does not use a mask and is consistent from designing to manufacturing many types of wiring patterns.

(Example 1) The present invention will be explained below with reference to Examples, but of course the present invention is not limited to these Examples.

Polyester resin 50 parts by weight Silver particles 47 parts by weight Glass frit 3 parts by weight are melt-kneaded at a temperature of 100'C or more, cooled and coarsely ground to form particles of 1 mm or less. The pulverized material is pulverized by a jet mill to create fine particles of 15 pm or less. Next, a lower cut was made by classification to remove 211 m or less. Therefore, toner particles having a particle size of 2 pm to 15 pm and an average particle size of 7.3 pm were obtained. The toner particles are blown in a state where they are dispersed into primary particles, and the temperature is about 200°C at the point where the toner and hot air collide.
The particles were exposed to hot air adjusted to give a spherical fine powder toner. This spheroidized fine powder toner and 1 part by weight of fine silica powder were mixed and deposited to form a toner.

A wiring pattern was formed on an alumina substrate using the toner using an electrophotographic method, and the resulting toner was placed at the bottom of a hole in an oxidizing atmosphere at a temperature of 900°C.

(Example 2) Polyester resin 55 parts by weight Silver 40 parts by weight Palladium 4 parts by weight 1 part by weight of charge control agent was melt-kneaded at 110°C for 110 minutes in a rotor-rotating kneader, and after cooling, coarsely pulverized by a new type pulverizer and granulator. do. Next, it was finely divided using a jet mill, and a classified powder having an average particle size of 6.011 m was obtained using an air classifier. The powder was prepared in Example 1.
The mixture was spheroidized using hot air in the same manner as described above, and 1 part by weight of silica powder was mixed and deposited to obtain a toner.

A wiring pattern is formed on a ceramic green sheet using the toner using an electrophotographic method, and a plurality of sheets are stacked at 110'.
A laminate was obtained by hot pressing under the condition of C1150 kg/cm2. Next, after a heat treatment step to remove the resin portion contained in the green sheet, the green sheet was sintered at 920'C to produce a multilayer ceramic wiring board.

The green sheet used here was a mixed powder having a composition of 55 parts by weight of alumina and 45 parts by weight of lead borosilicate glass. The sheet thickness was approximately 1100p.

(Example 3) Styrene acrylic resin 40 parts by weight Gold 59 parts by weight Charge control agent 1 part by weight Melt at 130°C for 15 minutes in a rotor kneader, cool, coarsely pulverize, and further finely powder to 15 pm or less using a jet mill. did. Next, the average particle size was 5.2 m by an air classifier.
The range was set to 211m to 15 yen 1m. The powder was spheronized and treated with silica in the same manner as in Example 1.

(Example 4) Polyester resin 50 parts by weight Copper 47 parts by weight Charge control agent 1 part by weight Glass frit 2 parts by weight were melt-kneaded at 100°C for 115 minutes, cooled, coarsely pulverized, finely pulverized, and classified to obtain an average particle size of 4. 511m and double m~12
The range was 11m.

Next, the mixture was spheronized with hot air and 0.8 parts by weight of silica was mixed to obtain a toner.

A wiring pattern was formed on an alumina substrate using the toner by electrophotography, and the wiring pattern was placed at the bottom of a hole at a temperature of 850° C. in a neutral atmosphere.

In the present invention, since the toner particles contain a conductive metal material, a wiring pattern can be formed on a ceramic substrate or a green sheet by electrophotographic description, and an electronic circuit can be formed by further sintering.

However, if the average particle size exceeds 10 pm, the toner particles become so large that the conductive metal particles do not come into contact with each other during sintering, and it is not practical because the conductivity of the wiring cannot be obtained or the wiring resistance becomes high.

(Effects of the invention) By adopting this method, not only is an exposure mask and a screen mask unnecessary, but there is no need to worry about clogging during printing, which is the case with the screen printing method. , there is no need to adjust the viscosity of the paste.

Further, unlike printed circuit boards, there is no need for troublesome and time-consuming chemical treatment processes such as etching, which is advantageous in terms of cost.

In addition, by adopting a method of directly electrophotographically printing electrical signals to form circuit patterns, it becomes possible to form graphic display patterns using a computer, and CAD
Designing and changing conductor circuit patterns using the system becomes extremely easy.

Claims (2)

[Claims] (1) A functional toner for circuit wiring, which is a toner for forming a circuit wiring pattern by electrophotography, and is characterized by containing a binder resin and conductive metal particles. (2) It is characterized by comprising a step of heating and kneading a binder resin and conductive metal particles to form a composite mixture, a step of coarsely pulverizing the composite mixture, a step of further pulverizing the composite mixture, and a step of classifying the fine powder particles. A method for producing a functional toner for line wiring.