JPS60240764A - Electrically conductive composition - Google Patents

Abstract

PURPOSE:To provide an electrically conductive compsn. which can secure electrical insulation and electrical conductivity with high reliability when terminals are bonded to each other through the compsn. under pressure, by incorporating an electrically conductive powder formed by a chemical reaction in an electrical insulating high-molecular adhesive material. CONSTITUTION:An electrically conductive compsn. consists of 100pts.vol. electrical insulating adhesive high-molecular material (A) (e.g. an adhesive composed of polyester, polyolefin, natural rubber or silicone rubber) and 0.001-10pts.vol. electrically conductive powder (B) formed by a chemical reaction (e.g. carbon black obtd. by combustion of oil, electrolytically reduced metal, TiO2 or SiC). Electronic circuit devices can be miniaturized and it is possible that a high-density terminal, particularly a connection of multi-electrode terminal arrangement (conductor width: 50mu, gap: 50mu, 100mu pitch) is lumped together, and electrical conductivity between opposing electrodes is 1OMEGA or below and electrical insulation resistance between adjoining terminals is 10''OMEGA at 250V. Hence, the compsn. is suitable for use in mounting devices for pattern processing or picture processing and multi-electrode IC can be connected in a lump.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductive composition, and in particular, when this S conductive composition is formed into a film or film having a thickness close to the particle size of the powder or granules in the composition, It has an anisotropic conductive structure such that it has an electrical conductivity of 1Ω or less only at a distance of 1Ω or less, and is electrically insulative in the creeping direction, for example, at a distance of 50 μm, Q11Ω or more at 250V.

Conventionally, electrically insulating polymers with adhesion properties are produced using powders obtained by mechanical pulverization, oil pulverization, water pulverization, or IIN atomization methods, or those obtained by cutting carbon m-dark blue into powder form. The conductive composition blended with the substance is formed into a film or membrane shape by pressure adhesion between the upper and lower conductive terminals to obtain conductivity, but this material does not pass environmental tests such as temperature and humidity. The durability and reliability were extremely low and it was difficult to withstand use.

The inventors of the present invention made extensive studies in view of the above points, and found that the composition consists of 100 parts by volume of an insulating polymeric material having adhesive properties and ~10 parts by volume of conductive powder or granules produced by chemical reaction. It has been learned that the most reliable method is to obtain a conductive composition and adhere it under pressure between the conductive terminals to ensure continuity and electrical insulation.

Hereinafter, the configuration of the present invention will be explained in detail.

As the electrically insulating polymer substance having adhesive properties, the following conventionally known adhesives which are normally liquid, viscous, or solid are used. Namely, pressure sensitive adhesives.

Hot-melt adhesives, adhesives made liquid or viscous with other solvents, adhesives that have adhesive properties that harden when irradiated with ultraviolet rays or radiation, adhesives made of thermosetting resins, and reaction-curing adhesives. Known electrically insulating synthetic resins, natural resin compositions, electrically insulating natural rubbers, and synthetic rubber compositions that have adhesive properties are included. Components include single components such as polyester, polyether, polyamide, polyolefin, polyvinyl halide, acrylonitrile-butadiene-styrene resin, acrylonitrile-styrene resin, polyurethane, polystyrene, polyacrylic acid ester, copolymer components, Adhesives consisting of mixed components, natural rubber, chloroprene, nitrile rubber, acrylic rubber, sulfonic acid rubber.

Single components such as urethane rubber and silicone rubber, copolymer components,
Adhesives made of mixed components, and adhesives made of single components, copolymerized components, and mixed components such as epoxy resins, polycyanurate resins, dicarboxylic acid resins, diallyl phthalate resins, and phthalate ester resins are included.

On the other hand, conductive powder produced by chemical reaction is
Carbon black obtained by decomposition reaction by burning or semi-combusting oil, carbon black obtained by firing the carbon black at a higher temperature and turning it into graphite, acetylene black obtained by dehydrogenating acetylene, ring element metal powder, e.g. carbonyl compound carbonyl nickel, platinum black, electrolytic ring metals, copper, silver, nickel,
Iron and other metal compounds such as tin oxide and indium oxide.

Refers to titanium nitride, silicon carbide, etc. The reason for using powder and granules produced by chemical reactions in the present invention is that powders and granules obtained by conventional mechanical grinding generally have a Poisson distribution, and the width of the distribution is large. In comparison, powders and granules produced by chemical reactions have stable particle shapes, have a small distribution width, and can be obtained from a sum of several microns or more to less than 1 micron, and are easy to obtain with small particles. It's for a reason. In particular, acetylene black and graphitized carbon black have a size of several tens of microns or less and have high bulkiness and flexibility, and are extremely suitable for pressure bonding. Carbonyl nickel particles having a diameter of several micrometers or less are very suitable because their surface roughness is flexible and elastic in the diameter direction relative to the particle diameter. In other words, the smaller the particle size, the greater the rate of elastic deformation caused by small stress. Therefore, it is better for the particle size of the above-mentioned powder to be small, preferably 30 μm or less, more preferably 10 μm or less, even more preferably 5 μm or less, and the particle size depends on the blending ratio. It's a shadow. As the particle size becomes larger, the width of the particle size distribution becomes larger, and the thickness of the film or membrane increases accordingly, which increases the dimensional movement in the thickness direction due to the influence of heat or drought marks. The presence of many particles that do not reach the thickness of , that is, do not participate in conduction, only increases the electrical traffic between adjacent conductive paths. in this way,
The blending ratio varies depending on the particle size, but in the present invention, the blending ratio is 100% of the electrically insulating polymer material with adhesive performance.
The amount of conductive powder produced by chemical reaction is 0.001 to 10 parts by volume per 4 parts of the volume.

Conductive powder produced by chemical reaction is 0.001
If it is smaller than the capacitance portion, the conduction density becomes small, making it impossible to use small conductor terminals in a high-density arrangement.

Moreover, if the diameter exceeds 10, there is a drawback that the distance between adjacent conductor terminals cannot be made small, and it becomes difficult to maintain electrical insulation from adjacent conductive paths.

Therefore, the conductive powder produced by chemical reaction is 0.
Practically preferred range is 0.002 to 5 parts by volume, more preferably 0.005 to 3 parts by volume.

Among conventional conductor powders, powder obtained by cutting carbon fibers has a small distribution of fiber thickness and length, but the length relative to the fiber diameter is large, causing pressure to be dispersed in the length direction. This makes it difficult to make uniform contact by adhesion, resulting in results similar to those obtained with powder particles having a large conductor particle distribution width and large particle size, resulting in poor reliability.

In addition, the composition of the present invention can be adjusted to a viscosity that is easy to use by using a solvent, etc., and in this case, a dispersant, a stabilizer, a thickener, a rust preventive, etc. may be added as necessary. .

As can be seen from the above description, the conductive composition of the present invention can be used to collectively connect high-density terminal arrays for downsizing electronic circuit devices, particularly multi-pole terminal arrays with a pitch of 100 μm and a spacing of 50 μm in the conductor. The conductivity between opposing conductors is 10 or less, and the conductivity between adjacent terminals is 250V.
Since it has an electrical insulation property of 1011Ω or more, it is suitable for mounting for graphic processing and image processing, and it is also possible to connect multi-pole ICs at once, making it suitable for terminal processing of various displays and high-density electrical - Extremely useful for designing and planning electronic circuits. These connections are fixed in the form of a film or membrane by applying pressure between circuit terminals and heating if necessary, or by irradiating ultraviolet rays. It can also be used by applying it to the surface. Furthermore, if it is used by applying it to the surface of a conventionally known pin connector or pressure contact type terminal, setting it, and then fixing it, the reliability of the conventional connector can be greatly improved. Furthermore, the composition according to the present invention may be applied to necessary locations by means such as screen printing, textile printing, D-lecoating, or the like, or may be applied to the surface of a release paper, and then cut and used.

Special Applicant: Zan Arrow Co., Ltd.

Claims (1)

[Claims] Conductive powder 0001-1 produced by chemical reaction with 100 parts by volume of an electrically insulating polymeric substance having adhesive properties
A conductive composition consisting of 0 volume old part.