JPS60116102A - Resistor - 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 resin-based resistor used in various electronic circuits.

Conventional Structures and Problems 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 manufacturing the resistor requires high temperatures and a long time, and furthermore, when laminated on a paper-phenol resin substrate, etc., the substrate deteriorates.4 There are several problems, and there is little hope for improvement.

OBJECTS OF THE INVENTION Therefore, it is an object of the present invention to provide a resistor that solves the above-mentioned problems associated with the manufacture of conventional resin-based resistors. This object is achieved by manufacturing a resistor by irradiating a resistive ink composition described in detail below with an electron beam.

Structure of the Invention The resistor according to the present invention uses, as a binder resin, a resin obtained by reacting a modified bisphenol A-formalin condensate with acrylic acid chloride or methacrylic acid chloride. is characterized in that it is made by using a mixture of the above resin and a monomer or oligomer containing at least one acrylic group, methacrylic group or allyl group, or a mixture thereof.

The ink produced by dispersing conventionally known conductive powders such as metal powder, carbon black, and graphite into these mixtures and adding a solvent if necessary is applied onto the substrate, dried if necessary, and then irradiated with an electron beam. By doing so, a resistor with excellent characteristics can be obtained in an extremely short period of time as seen in the examples.

An inorganic photonic agent or the like may be added to improve the size/ζ, lifespan, and electrical properties.

The bisphenol A-formalin condensate described here is a product obtained by reacting 1 mole of bisphenol A with 4 moles of formalin in the presence of an alkali catalyst, and it can be reacted with a commercially available ammonia resol in an alcohol solution. A modified product can be made by using this method, and is known as a binder resin for resistors (Japanese Patent Publication No. 44-6308).

An ester can be produced by reacting the modified product with acrylic acid chloride or methacrylic acid chloride in a non-alcoholic solution.

As the monomer or oligomer to be mixed with the above ester, one containing at least one acrylic group, methacrylic group, or acrylic group inside 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, propinope acrylate, butyl acrylate, hydroxyethyl acrylate, 2-ethylhexyl acrylate, ethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, etc. Acrylic esters of polyhydric alcohols, various epoxy acrylates, various oligoester acrylates, oligoacrylates such as various urethane acrylates, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, hydroxyethyl methacrylate, 2-ethylhexyl methacrylate, Examples include methacrylic esters of primary polyhydric alcohols such as diethylene glycol cymethacrylate and trimethylolpropane trimethacrylate, allyl alcohol, sialyl ether, diallyl adipate, diallyl phthalate, and both-terminal arylates of low molecular weight polyurethanes.

The mixing ratio of the ester obtained by reacting a modified bisphenol A-formalin condensate with acrylic acid or methacrylic acid and the above monomer or oligomer or a mixture thereof can be arbitrarily selected depending on the Yasugi characteristics of the resistor. can. As the conductive powder to be dispersed in these resin compositions, any conventionally known conductive powder can be used. For example, hot pot.

Examples include metal bridge powder, metal oxide powder, metal carbide powder, metal oxide powder, metal boride powder, carbon blank, graphite, and mixtures thereof. The mixing ratio of these conductive powders and the binder carrier (fat composition) may be within a conventionally known range.The binder resin composition and conductive powder may be mixed and kneaded by a known method with the addition of a carbonaceous medium if necessary. Then, after drying the substrate for 1 iL as required, irradiation with an electron beam is performed to produce a resistor.

The resistor obtained here is extremely hard and is particularly suitable as a resistor for a variable resistor that requires wear resistance.

Description of examples The present invention will be explained below using examples.

<Example 1> a) To bisphenol - Formalin condensate modified product 1 mole of bisphenol A and 4.5 moles of 3896 formalin were placed in a four-bottle flask equipped with a thermometer, a stirrer, a reflux vessel, and a follow-up funnel. , 2.2 mol of 6N caustic soda aqueous solution is added through the follow-up funnel while keeping the temperature from exceeding 60'C. After completion of the reaction, the mixture was reacted at 60±1° C. for 2 hours, neutralized with a 6N aqueous sulfuric acid solution, washed with water, and concentrated under reduced pressure to produce an 85% solution mainly consisting of tetramethylolated bisphenol. 1 part by weight of ammonia resol and 2 parts by weight of n-pyl alcohol were added to 9 parts by weight of this solution, completely removed from the bath, allowed to react for 30 minutes under reflux, and concentrated under reduced pressure. For 100p of the fixed amount of the modified product,
Acrylic acid chloride 18y is dropped at a dropwise speed of 0.51 min. After the addition, the mixture was warped at 6 6 'C±6°C for 1 hour, and unreacted acrylic acid chloride was removed under reduced pressure, washed with water, and concentrated under reduced pressure to obtain a resin bath liquid.

b) Resistance ink The above bath bOp, 16 pieces of fine carbon powder, and 30 yr of butylcarpitol are mixed and kneaded in a three-roll mill to produce a resistance ink.

C) Resistor After coating the above resistance ink on a paper-phenol side fat substrate and drying it, a 150F-eV electron beam was applied at 80M. ra
d irradiation to produce a resistor. The time required for electron beam irradiation was less than 1 second for a length of 16 cm. The resistor obtained here had a sheet resistance value of about 0.6FJJ/(1) and was hard with a pencil hardness of sH.

This resistor was tested at 85℃ and 60℃, 95℃.
After 1000 hours of humidity test, only one difference was -6.0% and -1.0%, respectively.

As a comparison, we conducted a heat and moisture resistance test on the resistor using thermosetting resistance ink, and the result was -5.6.
showed a change of 2.5%.

<Example 2> A resistor made using Ib+fat@enemy obtained by reacting methacrylic acid chloride instead of acrylic acid chloride in Example 1 had a surface f1' of 0.7KQ1 opening. It has resistance, exhibits a pencil hardness of 8 hours, and is heat resistant.

-6.0%, - in 1 humidity control test, respectively.
It showed a change of 1.0.

<Example 3> In addition to the resin bath enemy b O 9 prepared in Example 1, trimethylolpropane trimethacrylate 3F, diethylene glycol dimethacrylate 61% carbon fine powder 15)
and butylcarpitol 3.

The resistor obtained using 1 is 0.6 KQ/(-
It exhibited a pencil hardness of 8H with a resistance of 1 and a resistance of 8H, and in the heat resistance and moisture resistance tests, it had a moisture change of 0% and 2%, respectively.

In addition to the effects of the invention, as can be seen from the Examples and Comparative Examples, the resistor according to the present invention can be cured in an extremely short time using an electron beam irradiation device or a radiation type heating device, and can be cured in a very short time compared to conventional heat-curable resistors. Some dogs exhibit superior physical characteristics and are considered industrial young dogs.

Claims (2)

[Claims] (1) Acrylic acid chloride or methacrylic acid chloride is added to a varnish made by modifying a bisphenol A-formalin condensate with an ammoniacal resol. A resistor characterized in that it has 14 main components: a resin where i=, Sase-C, and an electrocardiographic powder. (2) A resin made by reacting acrylic acid chloride or methacrylic acid chloride with a varnish made by modifying a bisphenol A-formalin condensate with an ammonia resol, and at least one acrylic group, methacrylic group, or allyl group inside. 1. A resistor comprising, as main constituents, a monomer, an oligomer, or a mixture thereof, and a conductive fine powder.