JP2002231758A - Mounting method for ic chip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the mounting method of an IC chip by which the IC chip is surely mounted without using an expensive thermocompression device and without letting the IC chip shift from a prescribed mounting position. SOLUTION: An electron beam setting type conductive adhesive material layer is formed on a pair of the terminals of an antenna formed on a base material, and the bump of the IC chip is pierced from the upper part of the terminals, made sticky and disposed at the prescribed mounting position. Then, the conductive adhesive material is set by irradiating it with electron beams and the IC chip is mounted. As the conductive adhesive material, a tacky electron beam setting type conductive adhesive material containing conductive powder and adhesive elastomer to be set by the electron beams is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC chip mounting method, and more particularly, to a non-contact type IC.
The present invention relates to a method for mounting an IC chip on an antenna of a non-contact type data transmitting / receiving body such as a tag by using an adhesive.

[0002]

Conventionally, an information recording medium (R) such as a non-contact type IC tag capable of recording and erasing data by transmitting and receiving data in a non-contact state.
F-ID (RadioFrequency IDent)
A non-contact data transmitter / receiver used for the purpose of application (i.f. application)) has a configuration in which an antenna is arranged on a film-like or sheet-like base material, and an IC chip is mounted on the antenna. The antenna of this non-contact type data transmitting / receiving body is formed by printing with a conductive paste, and in the case of an IC chip, is pierced into a pair of terminal portions of the antenna located at the chip mounting portion of the base material. The one provided with a bump for conducting is adopted.

For example, conventionally, as shown in FIG. 3, an NCF (Non-Non-Coating) is provided on a terminal portion 3 of an antenna 2 which is formed by printing a conductive paste on a film-shaped or sheet-shaped substrate 1.
Conductive Film (insulating film) or NCP (Non
-Conductive Paste, insulating paste)
4-1 is arranged, pressurized from above with a hot-press device (flip chip bonder) to pierce the bump 5 of the IC chip, and then heat and harden to conduct the bump 5 and the terminal 3 of the antenna 2. As expected, an IC chip was mounted.

As shown in FIG. 2, an ACF (Anisotropic Coating) is placed on a terminal 3 of an antenna 2 formed by printing a conductive paste on a film-shaped or sheet-shaped substrate 1.
nductive Film, anisotropic conductive film) or ACP
(Anisotropic Conductive Paste) (conductive adhesive) 4-2 is arranged, pressurized from above with a hot-press device (flip chip bonder) to pierce the bumps 5 of the IC chip, and then heated. Then, the bump 5 and the terminal portion 3 of the antenna 2 are electrically connected to each other, and the IC chip is mounted. Reference numeral 6 denotes conductive particles.

[0005] The reason why the adhesive is used when connecting the IC chip to the antenna as described above is that if only the crimping is performed without using the adhesive, it is necessary to increase the crimping force until the IC chip is securely fixed. This may cause contact failure and antenna short-circuiting due to deformation of the IC chip, and may cause the IC chip to come off when an external force such as bending is applied to the substrate on which the IC chip is attached. Connection reliability depends largely on this adhesive.

[0006]

However, when an IC chip is mounted by a conventional IC chip mounting method,
The chip is pressurized by using an expensive heat and pressure device to pierce the bump 5 of the IC chip at a predetermined mounting position and is cured by heating. However, there has been a problem in that the IC chip is displaced from the predetermined mounting position.

Further, since the connection between the bump 5 and the terminal 3 of the antenna 2 is made through the conductive particles 6 or by the direct contact between the bump 5 and the terminal 3 of the antenna 2, the connection is made in a pinpoint manner. However, there is a problem that the contact area is small, the electric resistance is high, and the conduction is cut off due to physical shock, vibration, etc., especially in the case of the antenna 2 formed by the printing method. However, the problem of disconnection of conduction was a major problem.

Further, there is a problem that the curing time and the adhesion are basically based on heat conduction, so that the processing time is limited, and that the base material cannot be prevented from being deformed or deteriorated by heat.

SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems and eliminate the problem that the IC chip is shifted from a predetermined mounting position without using an expensive heat and pressure device. Can be easily returned to the predetermined mounting position, there is no problem of disconnection due to physical shock, vibration, etc., and the terminal of the antenna does not deform or deteriorate due to heat. It is an object of the present invention to provide a method of mounting an IC chip that can reliably connect an IC chip to an antenna at low cost while maintaining good contact between a portion and a bump of the IC chip and low electric resistance.

[0010]

The present invention has been made in consideration of the above problems, and has an electron beam-curable conductive pressure-sensitive adhesive layer formed on a pair of terminals of an antenna formed on a base material. A method of mounting the IC chip by piercing and sticking a bump of the IC chip from above the terminal portion and sticking it to a predetermined mounting position, and then irradiating an electron beam to cure the conductive adhesive. And a method of mounting an IC chip, characterized in that a tacky electron beam-curable conductive adhesive containing conductive powder and an adhesive elastomer cured by an electron beam is used as the conductive adhesive. .

[0011]

Next, the present invention will be described in detail.
One embodiment of the present invention will be described with reference to FIG. In the present invention, as shown in FIG. 1, an electron beam-curable conductive pressure-sensitive adhesive layer 7 is formed on a terminal portion 3 of an antenna 2 formed by printing with a conductive paste on a film-like or sheet-like base material 1. Form. It is important to use a tacky electron beam-curable conductive pressure-sensitive adhesive containing a conductive powder and a pressure-sensitive adhesive elastomer cured by an electron beam. Since this conductive pressure-sensitive adhesive layer 7 has flexibility and tackiness, it is an expensive heat and pressure device (flip chip bonder).
The bump 5 of the IC chip can be easily pierced into a predetermined mounting position from above without using a special device such as the above. The IC chip 1 is deformed so as to be wound around the bump 5 and sticks to the bump 5 and the inner wall of the terminal portion 3 so as to sandwich the bump 5 so that the IC chip can be disposed at a predetermined mounting position.

The tackiness of the conductive pressure-sensitive adhesive referred to in the present invention is defined as
When the bumps 5 of the IC chip are pierced and brought into contact with the electron beam-curable conductive pressure-sensitive adhesive layer 7 at an extremely low pressure, a bond having a measurable strength is formed in an extremely short time, and the sticky tackiness is obtained. The bumps 5 of the disposed IC chip stick to the conductive pressure-sensitive adhesive layer 7 and to the inner wall of the terminal portion 3 through a part 7-1 of the conductive pressure-sensitive adhesive layer 7, so that a slight impact or vibration may occur. Even if there is, it does not deviate from a predetermined mounting position. If the IC chip is displaced from the predetermined mounting position at this stage, the mounted IC chip can be removed, and after removal, the bump 5 of the IC chip is pierced to the predetermined mounting position and then mounted again. Can be.

After arranging the IC chip at a predetermined mounting position in this manner, the electron chip is irradiated with an electron beam from above the terminal portion 3, from below the base material 1, from both directions, or from the lateral direction. The wire-curable conductive pressure-sensitive adhesive layers 7 and 7-1 are cured to form the bumps 5 and the terminal portions 3 of the antenna 2.
And the IC chip is mounted. A portion 7-1 of the cured electron beam-curable conductive pressure-sensitive adhesive layer 7 conducts and is fixed while always applying a slight pressure to the bump 5, so that the contact area is large and the contact is reliable. And the electrical resistance is reliably reduced.

The energy of the electron beam generally used for electron beam curing (free radical polymerization) is as large as about 150 to 300 KeV even at a low energy, and the polymerization / crosslinking reaction is started simultaneously with the irradiation. There is no need to add a sensitizer, and the cure is completed in a fraction of a second or less. In the case of an electron beam of 10 Mrad or less, the influence of heat is hardly a problem, so that the base material can be prevented from being deformed or deteriorated by heat, and the processing time can be reduced, so that the cost can be reduced. Can be mass-produced.

The tacky elastomer which is cured by an electron beam used in the present invention includes, for example, thermoplastic elastomer, natural rubber, styrene / butadiene copolymer rubber, polyisobutylene, isobutylene polymer, isobutylene / isobrene copolymer (butyl rubber) , Isoprene rubber, butadiene polymer, styrene / butadiene copolymer, styrene / isoprene, styrene / isoprene / styrene block polymer, styrene / butadiene / styrene block polymer, chloroprene rubber, butadiene / acrylonitrile copolymer rubber, butyl rubber, acrylic polymer (Polymethyl acrylate, polyethyl acrylate, polybutyl acrylate, polyoctyl acrylate), vinyl ether polymers (polyvinyl methyl ether, polyvinyl ethyl ether) Le, polyvinyl ether),
Polyvinyl alcohol, polyvinyl butyral, polyvinyl pyrrolidone, vinyl pyrrolidone / vinyl acetate copolymer, dimethylaminoethyl methacrylic acid, polyvinyl caprolactam, combination copolymer of polyvinyl pyrrolidone, dimethylaminoethyl methacrylic acid and polyvinyl caprolactam, maleic anhydride copolymer Polymer, silicone adhesive (polyvinyl siloxane), polyurethane, polyvinyl chloride, gelatin, shellac, gum arabic, rosin, rosin ester, ethyl cellulose, carboxymethyl cellulose, paraffin, tristearin, polyvinyl alcohol, polyethylene, polypropylene, acrylic resin, Vinyl resin, polyisobutene, polybutadiene, epoxy resin, phenol resin, polyurethane, polyester Mention may be made of polyamide, silicone, polystyrene, one or two or more alone or a mixture of melamine resin.

If necessary, a softening agent (liquid polybutene, mineral oil, liquid polyisobutylene, liquid polyacrylate), a tackifier (rosin and rosin derivative, polyterbene resin, terpene phenol resin) may be added to these adhesive elastomers. , Petroleum resin) may be added.

Further, if necessary, any of known photopolymerizable monomers and / or photopolymerizable oligomers can be optionally added to these tacky elastomers. Specific examples of such photopolymerizable monomers include, for example, unsaturated carboxylic acids such as acrylic acid and methacrylic acid or esters thereof, for example, alkyl-, cycloalkyl-, halogenated alkyl-, alkoxyalkyl-, hydroxyalkyl -, Aminoalkyl-, tetrahydrofurfuryl-, allyl-, glycidyl-, benzyl-, phenoxy-acrylate and methacrylate,
Alkylene glycol, polyoxyalkylene glycol mono- or diacrylate and methacrylate, trimethylolpropane triacrylate and methacrylate, pentaerythritol tetraacrylate and methacrylate, such as acrylamide, methacrylamide or derivatives thereof, for example, mono-substituted with an alkyl group or a hydroxyalkyl group Or allyl compounds such as disubstituted acrylamide and methacrylamide, diacetone acrylamide and methacrylamide, N, N'-alkylenebisacrylamide and methacrylamide, and maleic compounds such as allyl alcohol, allyl isocyanate, diallyl phthalate and triallyl isocyanurate. Acid, maleic anhydride, fumaric acid or its ester such as alkyl, halogenated alcohol Kill and mono- or dimaleate and fumarates alkoxyalkyl, other unsaturated compounds, such as styrene, vinyltoluene, divinylbenzene, N- vinylcarbazole, etc. N- vinylpyrrolidone is used.

In the case of an application in which curing shrinkage is a problem, for example, isobornyl acrylate or methacrylate, norbornyl acrylate or methacrylate, dicyclopentenoxyethyl acrylate or methacrylate, dicyclopentenoxypropyl acrylate or Such as methacrylate, acrylate or methacrylate of diethylene glycol dicyclopentenyl monoether, acrylate or methacrylate of polyoxyethylene or polypropylene glycol dicyclopentenyl monoether, such as dicyclopentenyl cinnamate, dicyclopentenoxy 3,9-bis (1,1) such as ethyl cinnamate, dicyclopentenoxyethyl monofumarate or difumarate.
-Bismethyl-2-oxyethyl) -spiro [5,5]
Undecane, 3,9-bis (1,1-bismethyl-2-
(Oxyethyl) -2,4,8,10-tetraoxaspiro [5,5] undecane, 3,9-bis (2-oxyethyl) -spiro [5,5] undecane, 3,9-bis (2-oxyethyl) Mono-, diacrylate or mono-, such as -2,4,8,10-tetraoxaspiro [5,5] undecane, dimethacrylate, or mono-, ethylene- or propylene oxide addition polymers of these spiroglycols; Diacrylate, or mono-, dimethacrylate, or methyl ether of the above-mentioned monoacrylate or methacrylate, 1-azabicyclo [2,2,2] -3-octenyl acrylate or methacrylate, bicyclo [2,2,1] -5 Dicyclopentane such as heptene-2,3-dicarboxyl monoallyl ester Enyl acrylate or methacrylate, it can be used a photopolymerizable monomer, such as dicyclopentadienyl oxyethyl acrylate or methacrylate, dihydrodicyclopentadienyl acrylate or methacrylate. These photopolymerizable monomers may be used alone or in combination of two or more.

Examples of the photopolymerizable oligomer include acrylates of epoxy resins, such as diglycidyl ether diacrylate of bisphenol A, reaction products of epoxy resins with acrylic acid and methyltetrahydrophthalic anhydride, and epoxy resins with 2-hydroxy Epoxy resin prepolymers such as reaction products with ethyl acrylate, reaction products of diglycidyl ether of epoxy resin with diallylamine, ring-opening copolymers of glycidyl diacrylate with phthalic anhydride, and methacrylic acid dimers Unsaturated polyester prepolymers such as esters of phenols and polyols, polyesters obtained from acrylic acid, phthalic anhydride and propylene oxide, and reaction products of polyethylene glycol, maleic anhydride and glycidyl methacrylate A reaction product of polyvinyl alcohol and N-methylolacrylamide, a polyvinyl alcohol-based prepolymer such as one obtained by esterifying polyvinyl alcohol with succinic anhydride and then adding glycidyl methacrylate, and pyromellitic dianhydride. A polyamide prepolymer such as a prepolymer obtained by reacting a diallyl ester with p, p'-diaminodiphenyl, a reaction product of an ethylene-maleic anhydride copolymer with allylamine, methyl vinyl ether-maleic anhydride A reaction product of an acid copolymer and 2-hydroxyethyl acrylate, or a polyacrylic acid or maleic acid copolymer prepolymer such as a product obtained by further reacting glycidyl methacrylate; Linked alkylene segments, or saturated polyester segment or both, and the like urethane prepolymer having an acryloyl group or a methacryloyl group at both ends. These photopolymerizable oligomers suitably have a weight average molecular weight in the range of about 2,000 to 30,000.

If necessary, a known solvent such as a diluent can be added to the electron beam-curable conductive pressure-sensitive adhesive used in the present invention, as long as it can be removed before the IC chip is adhered. As the solvent, specifically, for example, hydrocarbon solvents such as toluene, cyclohexane, methylcyclohexane, n-hexane, pentane, isopropyl alcohol, alcohols such as butyl alcohol, cyclohexanone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, Ketones such as isophorone, esters such as ethyl acetate, propyl acetate and butyl acetate, ethylene glycol monomethyl ether, propylene glycol monoethyl ether, diethylene glycol monomethyl ether, 3-methoxy-3
Glycol monoethers such as -methylbutyl acetate and their acetate compounds, or a mixture of one or more of these.

Examples of the conductive powder used in the present invention include the following a to j. a. Silver powder Dowa Mining Co., Ltd. G-10,11,12,13,1
5-H, 15H, 18, Chemical Flake TCG-1, 1A, 5, 7, 11 manufactured by Tokuriki Honten
N, 7V, TC-12, 20E, 20V, 25A, J-
20, E-20, G-1, H-1, AgF-5S, Ag
F-10S Tanaka Kikinzoku Kogyo Co., Ltd. AY-6010, 6080 b. Conductive carbon black manufactured by Mitsubishi Chemical Corporation Ketjen Black EC, EC-
600JD Acetylene black manufactured by Denki Kagaku Kogyo Co., Ltd. Vulcan XC-72 manufactured by Cabot Corporation Conductex-97 manufactured by Columbia Chemical Company
5, Conductex-SC c. Copper powder DC-50,100,200,3 manufactured by Dowa Mining Co., Ltd.
00 d. Nickel powder DNI-20,50 manufactured by Dowa Mining Co., Ltd. e. Gold powder TA-1,2 manufactured by Tokuriki Honten f. Platinum powder TP-1, manufactured by Tokuriki Honten Co., Ltd. AY-1010, 1020 manufactured by Tanaka Kikinzoku Kogyo Co., Ltd. g. Palladium powder TPd-1 manufactured by Tokuriki Honten Co., Ltd. AY-4010, 4030 manufactured by Tanaka Kikinzoku Kogyo KK h. Silver / palladium alloy powder AP-10,30 manufactured by Tokuriki Honten i. Zinc powder j. Aluminum powder

The conductive adhesive for mounting an IC chip used in the present invention comprises a mixture of a conductive powder and an electron beam-curable component containing the above-mentioned adhesive elastomer, but the mixing ratio of both is not particularly limited. However, a mixture in which 10 to 100 parts by mass of an electron beam-curable component is mixed with 100 parts by mass of the conductive powder can be preferably used. Further, the tackifier is mixed in the range of 1 to 50 parts by mass, preferably 30 parts by mass or less. The diluent may be added in the range of 0 to 100 parts by mass. And the viscosity is 1-10
About 0 Pa · s is good, and a desirable range is 10-6.
0 Pa · s.

The electron beam-curable conductive pressure-sensitive adhesive used in the present invention may be, if necessary, an insulating powder such as silica, alumina, glass, talc, various rubbers, or a release agent, a surface treatment agent, a filler, a pigment. And known additives such as dyes and the like.

The electron beam-curable conductive pressure-sensitive adhesive used in the present invention is in the form of a uniform varnish by mixing the above components, or is uniformly kneaded by a known method using a stirrer, kneader, roll mill or the like. What did
Alternatively, any of those in the form of a film can be used, and the electron beam-curable conductive pressure-sensitive adhesive layer is formed on the terminal portion of the antenna formed on the base material using a known method such as printing, dispensing, and pasting. Can be formed.

The electron beam irradiation device used in the present invention is not particularly limited, and a known device can be used. However, for example, it is preferable to use an electron beam irradiation device with an acceleration voltage of 100 to 500 kv. Irradiation conditions are not particularly limited, but the absorbed dose is 10 to 100 kGy (kilo gray).
Irradiation is preferably performed under an inert gas atmosphere under such conditions.

In the present invention, in order to improve the characteristics after mounting the IC chip on the base material, to secure and maintain the leveling property, or to remove the solvent when a solvent is used, etc. Oven heating before or after electron beam irradiation, or before or after electron beam irradiation, or simultaneously with electron beam irradiation, as long as the substrate does not significantly deteriorate such as coloring, heat shrinkage, softening, and carbonization Heat treatment can be used in combination with hot air blowing, hot plate contact, infrared or microwave irradiation, or the like.

The substrate used in the present invention includes:
Woven fabrics, nonwoven fabrics, mats, papers or a combination thereof, made of inorganic or organic fibers such as glass fiber, alumina fiber, polyester fiber, polyamide fiber, or composite substrates formed by impregnating these with resin varnish, polyamide Resin base material, polyester resin base material,
Polyolefin resin base material, polyimide resin base material, ethylene / vinyl alcohol copolymer base material, polyvinyl alcohol base material, polyvinyl chloride base material, polyvinylidene chloride base material, polystyrene base material ,
Plastic substrates such as polycarbonate resin substrates, acrylonitrile butadiene styrene copolymer resin substrates, and polyether sulfone resin substrates, or matte treatment, corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, electron beam irradiation treatment And known ones such as those subjected to a surface treatment such as a flame plasma treatment and an ozone treatment, or various easy adhesion treatments.

The formation of the antenna on the substrate can be performed by a known method. For example, screen printing of a conductive paste, pasting of a coated or uncoated metal wire, etching, pasting of a metal foil, direct deposition of a metal, transfer of a metal deposited film, and the like may be mentioned, and an antenna in which these are multiplexed may be used. . The thickness of the IC chip used in the present invention is:
It is desirable that the thickness is approximately the same as the terminal thickness of the antenna,
For example, it is preferably about 200 to 10 μm. If necessary, bumps may be formed on the IC chip by metal electroplating, studs, electroless metal plating, or fixing of a conductive resin.

In the present invention, after the IC chip is mounted on the base material, the entire or a part of the mounting portion is protected by a glove top material or an underfill material in order to protect the IC mounting portion from physical or chemical impact. The coating may be protected.

The description of the above embodiment is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope of the invention. Further, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

[0031]

According to the method for mounting an IC chip according to the first aspect of the present invention, there is no problem that the IC chip is shifted from a predetermined mounting position without using an expensive heat and pressure device. It is possible to easily return the chip to the specified mounting position, there is no problem of disconnection due to physical shock, vibration, etc., and the base material is not deformed or deteriorated by heat, This has a remarkable effect that the IC chip can be securely connected to the antenna at low cost while maintaining good contact between the terminal portion and the bump of the IC chip and low electric resistance.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of mounting an IC chip by a method of the present invention.

FIG. 2 is an explanatory diagram showing an example of mounting an IC chip by a conventional method.

FIG. 3 is an explanatory diagram showing another example of mounting an IC chip by a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Antenna 3 Terminal part 4-1 Adhesive 4-2 Conductive adhesive 5 Bump 6 Conductive particle 7 Conductive adhesive layer 7-1 Conductive adhesive

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C005 MA19 MB06 NA09 RA22 5B035 BA03 BB09 CA01 CA23 5E319 BB11 5F044 LL07

Claims (1)

[Claims] An electron beam-curable conductive pressure-sensitive adhesive layer is formed on a pair of terminals of an antenna formed on a base material, and a bump of an IC chip is pierced from above the terminals so as to stick and stick. A method of mounting an IC chip by irradiating an electron beam to cure the conductive adhesive after disposing the IC chip at a mounting position, wherein the conductive adhesive is a conductive powder and an adhesive elastomer cured by an electron beam. A method of mounting an IC chip, comprising using an electron beam-curable conductive adhesive having tackiness.