JPS59195802A - Resistance ink composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a resistive ink composition for manufacturing resin-based resistors used in various electronic circuits.

Conventional I91 Structure and its Problems Conventionally, resin-based resistors have been widely used as fixed resistors or variable resistors. These conventional resistors have used thermosetting resin as the binder resin, so the manufacturing process of the resistor requires high temperatures. It takes a long time, and when laminated on a paper-phenol resin substrate, etc., there are problems such as deterioration of the substrate, etc., and improvements are desired.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to provide a resistive ink composition which overcomes the problems associated with the manufacture of conventional resin-based resistors. This object can be easily achieved by manufacturing a resistor by irradiating a resistive ink composition described in detail below with an electron beam.

Advantages of the Invention The resistive ink composition according to the present invention comprises polyurethane acrylate having at least one acrylic group in the terminal and main chain of polyurethane as a binder resin, and at least one acrylic group, methacrylic group or allyl group inside. acrylic, methacrylic, or a mixture with an allyl monomer or oligomer. Then, conventional conductive powders such as metal powder, carbon black, graphite, etc. are dispersed in these mixtures, and a solvent is added if necessary, and the ink produced is applied onto the substrate, dried if necessary, and then exposed to an electron beam. By irradiating it, a resistor with excellent characteristics can be obtained in an extremely short period of time, as seen in Example 1.

As the monomer or oligomer to be mixed with the polyurethane acrylate, a monomer or oligomer containing at least acrylic, methacrylic, or allyl groups can be used. Although these monomers or oligomers can be used alone, in many cases, it is easier to control the resistor characteristics when used in a mixed system. Examples of monomers or oligomers that can be used here include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate,
Acrylic ester extracts or buds of primary or polyhydric alcohols such as hydroxyethyl acrylate, 2-ethylhexyl acrylate, ethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, various oligoester acrylates, and various urethane acrylates. Methacrylate of primary or polyhydric alcohols such as sugoacrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, hydroxyethyl methacrylate, 2-ethylhexyl memethacrylate, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, etc. Examples include ester, allyl alcoholonopediallyl ether, diallyl adipate, diallyl phthalate, and both terminal arylates of low molecular weight polyurethanes.

The mixing ratio of polyurethane acrylate and the above monomer or oligomer can be arbitrarily selected depending on the required characteristics of the resistor. As the conductive powder to be dispersed in these resin compositions, conventionally known conductive powders can be used. Examples include metal powder beds such as silver, copper, or alloys thereof, metal oxide powders, metal carbide powders, metal nitride powders, metal boride powders, carbon black, graphite, or mixtures thereof. The mixing ratio of these conductive powders and the binder resin composition may be within a conventionally known range. The binder resin composition and the conductive powder are mixed and kneaded by a known method, adding a solvent as necessary, and then applied onto a substrate, dried as necessary, and then irradiated with an electron beam to produce a resistor. do.

The resistor obtained here is particularly preferable as a resistor for a variable resistor which requires wear resistance.

Description of examples Examples of the present invention will be described below using Table 1 below.

<Example 1> A resistance ink was prepared by kneading a mixture having the composition shown in Table 1 in a three-roll mill. Each resistance ink was applied onto a paper-phenolic resin substrate, dried, and then heated at 165 K.
A resistor was manufactured by fully irradiating the electron beam at an accelerating voltage of V. 1
The time required to irradiate the entire length of 5 cm was less than 1 second.

The resistors thus obtained were highly flexible, and their properties are shown in Table 1. on the other hand,
Incidentally, when we conducted a moisture resistance test and a heat resistance test under the same conditions for the currently commonly used thermosetting resistor (using phenolic resin), the results showed a change of 5.5% and -4.5%, respectively. .

(Leaving space below) <Example 2> Polyethylene terephthalate film (thickness 5oIim) subjected to resistance ink gold surface release treatment according to Table 1.
Coat the top with a thickness of 25 μm, dry it, and then apply a layer of 26 μm.
Silver ink was applied to the thickness of 6'l of Viscoat $823, manufactured by Osaka Organic Chemical Industry Co., Ltd., 1.6-hexafushiol dimethacrylate 3, trimethylolpropane trimethacrylate 1y, and silver powder. 40% of ethyl cellosolve and 60 parts of ethyl cellosolve] was completely coated and dried, and then an adhesive consisting of 6 parts by weight of epoxy acrylate and 1 part by weight of diethylene glycol dimethacrylate was applied on top of it, and it was pasted on a paper-phenol substrate. Combined, polyethylene terephthalate film side collar, force low speed voltage 16
A resistor was irradiated with a 5KV electron beam f 50 M rad,
After curing the adhesive, the polyethylene terephthalate film was removed, resulting in a resistor with an extremely smooth surface. A precision potentiometer was made using a wire brush as the resistor, and its sliding life was measured and it was found to be able to withstand 2 cycles of sliding. By the way,
The sliding life of currently used precision potentiometers that use thermosetting resistors is approximately one cycle.

Effects of the Invention As can be seen from Examples 1 and 2 above, by curing the resistive ink composition according to the present invention with electron beams to produce a resistor, it is possible to produce a resistor that conventionally requires several minutes to several hours at high temperature. It can be manufactured in a shorter time than conventional resistors, has the same resistor properties as conventional products, and has superior sliding life, etc., and its industrial effects are second to none. be.

Claims (1)

[Claims] Polyurethane acrylate having at least one acrylic group in the terminal and main chain of polyurethane, including HIS
an acrylic, methacrylic or allyl monomer or oligomer containing at least one acrylic, methacrylic or allyl group, or a mixture thereof;
and a resistive ink composition comprising conductive fine powder.