CN101821352B - Adhesive and connecting structure using the same - Google Patents

Adhesive and connecting structure using the same Download PDF

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Publication number
CN101821352B
CN101821352B CN200880105355XA CN200880105355A CN101821352B CN 101821352 B CN101821352 B CN 101821352B CN 200880105355X A CN200880105355X A CN 200880105355XA CN 200880105355 A CN200880105355 A CN 200880105355A CN 101821352 B CN101821352 B CN 101821352B
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China
Prior art keywords
methyl
maleimide
caking agent
resin
formula
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CN101821352A (en
Inventor
宫泽笑
加藤木茂树
伊泽弘行
白坂敏明
富泽惠子
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Lishennoco Co ltd
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Hitachi Chemical Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
    • H05K3/323—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives by applying an anisotropic conductive adhesive layer over an array of pads
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • C09J9/02—Electrically-conducting adhesives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
    • H01B1/12—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances organic substances
    • H—ELECTRICITY
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    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
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  • Spectroscopy & Molecular Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Wire Bonding (AREA)
  • Conductive Materials (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)
  • Combinations Of Printed Boards (AREA)

Abstract

Provided is an adhesive containing (a) a thermoplastic resin, (b) a radical polymerizable compound and (c) a radical polymerization initiator. The radical polymerizable compound is in a solid-state at a temperature of 30 DEG C or below.

Description

Caking agent and the syndeton body that uses this caking agent
Technical field
The present invention relates to a kind of caking agent, and the syndeton body that uses the circuit block of this caking agent.
Background technology
In semiconductor element and liquid crystal display device, in order to make the various parts bondings in element, use various caking agents all the time.For caking agent used in this purposes, at first require bonding strength, and require under thermotolerance, hot and humid environment (for example, 85 ℃/85%RH) many-sided characteristics such as connection reliability.In addition, used by sticky object when bonding, be mainly the organic substrates such as printed-wiring board (PWB) and polyimide, and can use metal and ITO, the Si such as copper, aluminium 3N 4, SiO 2Deng the base material with kinds of surface state.Therefore, it is necessary being fit to various molecular designing by the caking agent of sticky object.
All the time, as the caking agent of above-mentioned semiconductor element and used for liquid crystal display element, used the thermosetting resin that contains the epoxy resin that demonstrates high-adhesive-strength and high connecting reliability to be used (for example, referring to patent documentation 1).As thermosetting resin, usually use contain epoxy resin, have with the solidifying agent such as reactive resol of epoxy resin and promote epoxy resin and the hot potentiality catalyzer of solidifying agent reaction as the material of constituent.
Hot potentiality catalyzer is the important factor that determines solidification value and curing speed, and the viewpoint of the curing speed the when package stability under the room temperature and heating considers, it can use various compounds.In the operation of reality, by at 170～250 ℃, be cured under the condition of cure of 1～3 hour, and the bonding strength that acquisition is wished.
Yet along with the high-precision refinement of highly integrated, the liquid crystal cell of recent semiconductor element, the spacing between element and between circuit constantly narrows down, and the heating when therefore solidifying causes circumferential component has been produced disadvantageous effect.In addition, for cost degradation, and need to improve turnout, and require to solidify at lower temperature and at short notice, that is to say, require low temperature quick-setting bonding.In order to realize this low temperature fast setting, must use the low hot potentiality catalyzer of activation evergy, yet be known that to be difficult to have concurrently activation evergy low and in these two kinds of performances of package stability of near room temperature.
To this, recently, just receive publicity with the free-radical polymerised compound such as acrylate derivative or methacrylate derivative with as the radical-curable caking agent that the superoxide of radical polymerization initiator is combined with.The radical-curable caking agent due to reactive strong as the free radical of reactive behavior seed wherein, therefore can solidify (for example, referring to patent documentation 2) at short notice.In addition, also proposed to use ammonia ester acrylic compound as the radical-curable caking agent of free-radical polymerised compound, wherein said ammonia ester acrylic compound has been endowed flexibility and flexible (referring to patent documentation 3,4) by ester bond.
Patent documentation 1: Japanese kokai publication hei 1-113480 communique
Patent documentation 2: TOHKEMY 2002-203427 communique
Patent documentation 3: TOHKEMY 2001-262079 communique
Patent documentation 4: TOHKEMY 2002-285128 communique
Summary of the invention
The problem that invention will solve
Yet, the radical-curable caking agent in the past of putting down in writing in patent documentation 2 grades, the cure shrinkage during due to curing is large, compares during therefore with use epoxy resin, has the poor problem of bonding strength.
In addition, the radical-curable caking agent of the use ammonia ester acrylate of putting down in writing in patent documentation 3,4 etc. owing to having ester bond in molecule, therefore has the caking agent physical property such as spring rate after curing and second-order transition temperature and descends, and the water-intake rate rising, the problem that hydrolytic resistance descends.Therefore, when it is used for the caking agent of semiconductor element and liquid crystal display device, have under hot and humid environment (for example, 85 ℃/85%RH) can't obtain the problem of enough connection reliability.
Further, above-mentioned ammonia ester acrylate is at room temperature low viscous aqueous, and therefore when it was used as the gradation composition of film-like adhesive, the surface glue viscous force of the gluing degree of presentation surface increased as can be known, and has problem aspect operability.
The present invention carries out in view of the existing problem of above-mentioned conventional art, its objective is (for example provides in a kind of short period of time at low temperatures, 160 ℃ of lower 10 seconds kinds) syndeton body and the connection reliability of syndeton body under hot and humid environment that can fully suppress gained that solidifies, can obtain to have the circuit block of excellent bonding strength when the junction circuit parts reduce, also excellent caking agent of operability, and the syndeton body that uses the circuit block of this caking agent in addition.
In addition, in this specification sheets, so-called " can fully suppress the connection reliability of syndeton body under hot and humid environment reduces ", even refer under hot and humid environment through in long situation, also can fully suppress the reduction of the bonding strength between circuit block, and the rising of the contact resistance between relative splicing ear.
The method of dealing with problems
To achieve these goals, the invention provides a kind of caking agent, it contains (a) thermoplastic resin, (b) free-radical polymerised compound, and (c) radical polymerization initiator, and wherein (b) free-radical polymerised compound is being solid below 30 ℃.
According to caking agent of the present invention, can solidify at low temperature and in the short period of time, can obtain to have the syndeton body of the circuit block of excellent bonding strength when having connected circuit block, and the connection reliability of syndeton body under hot and humid environment that can fully suppress gained reduces, and operability is also excellent in addition.Although it is not yet clear and definite to use caking agent of the present invention can obtain the reason of these effects, but can think, (b) free-radical polymerised compound exists with solid under service temperature (for example, below 30 ℃), is one of reason thereby relatively reduced aqueous composition.
Caking agent of the present invention preferably further contains (d) has at least more than one phosphate in molecule vinyl compound.Thus, under the condition of cure of low temperature and short period of time, can obtain more excellent bonding strength.
(a) thermoplastic resin preferably contains at least a resin that is selected from phenoxy resin, vibrin, urethane resin, polyester urethane resin, butyral resin, acrylic resin, polyimide resin.Thus, can be suppressed at more fully under hot and humid environment the reduction of the bonding strength after long-time.
Caking agent of the present invention preferably further contains (e) electroconductive particle.Thereby, owing to giving electroconductibility or anisotropic conductive to caking agent, therefore can be according to suitable caking agents that uses such as the connection purposes each other of the circuit block with splicing ear.In addition, can fully reduce by the contact resistance between the splicing ear of above-mentioned caking agent electrical connection.
In addition, the invention provides a kind of syndeton body of circuit block, it is, first circuit block that will have the first splicing ear becomes to make described the first splicing ear relative with described the second splicing ear with the second circuit component configuration with second splicing ear, the caking agent of the invention described above is present between described first splicing ear and described the second splicing ear of subtend configuration, carry out heating and pressurizing, described the first splicing ear and described the second splicing ear are electrically connected to form.
Therefore this syndeton body can fully improve the bonding strength of circuit block, and can fully suppress the reduction of the connection reliability under hot and humid environment due to the caking agent that uses the invention described above.
The invention effect
According to the present invention, syndeton body and the connection reliability of syndeton body under hot and humid environment that can fully suppress gained that can provide a kind of and solidify at low temperature and in the short period of time, can obtain during at the junction circuit parts to have the circuit block of excellent bonding strength reduce, also excellent caking agent of operability, and the syndeton body that uses the circuit block of this caking agent in addition.
The simple declaration of accompanying drawing
The summary sectional view of a kind of embodiment of the syndeton body of [Fig. 1] expression circuit block of the present invention.
Nomenclature
7... electroconductive particle, 10... electric circuit connection member, 11... resin, 20, the 30... circuit block, 21, the 31... circuit substrate, 22, the 32... circuit electrode.
Embodiment
Below, be elaborated for the preferred embodiment of the present invention.In addition, in this manual, " fusing point " refers to the exothermal peak temperature by the differential scanning calorimetric measurement curve of differential scanning calorimetric measurement gained.In addition, above-mentioned differential scanning calorimetric measurement, (Perkinelmer Inc. makes for example can to use differential scanning calorimeter, Pyris DSC7), flow with 10mL/min passes into air, and after 25 ℃ of maintenances, carries out being warming up to 10 ℃/min under the condition of 120 ℃.
(a) thermoplastic resin as used in the present invention is not particularly limited, and can use well known materials.As this polymkeric substance, can use polyimide, polymeric amide, phenoxy resin class, poly-(methyl) esters of acrylic acid, polyimide, polyurethanes, polyester, PAUR class, polyvinyl butyral class, vinyl-vinyl acetate copolymer etc.These polymkeric substance can use separately as required, or use mixing more than 2 kinds.Further, can contain siloxane bond or fluoro substituents in these polymkeric substance.These polymkeric substance so long as the resin that mixes is fully compatible each other, or produces the state that microphase-separated forms muddiness, just can use well.The molecular weight of above-mentioned polymkeric substance is larger, more easily obtains film-forming properties, and the melt viscosity that the mobility as caking agent is exerted an influence can be set as relative broad range.Molecular weight is not particularly limited, but weight-average molecular weight is preferably 5,000～500,000 usually, and more preferably 10,000～100,000.Less than 5,000 o'clock, film-forming properties had the tendency of variation, and surpasses at 500,000 o'clock when it, and the consistency of other composition has the tendency of variation when this value.
As (b) free-radical polymerised compound used in the present invention; can be have in styrene derivatives, maleimide derivatives or molecule an above acryl or methacryloyl (after; be called (methyl) acryl) compound; and so long as be the material of solid below 30 ℃; just be not particularly limited, can use well known materials.
Herein, " being solid below 30 ℃ ", refer to above-claimed cpd independent when standing below 30 ℃, be shown as wax-like, wax-like, lenticular, glassy, powdery etc. and there is no the solid state of mobility, or above-claimed cpd is carried out above-mentioned differential scanning calorimetric measurement, its fusing point is over 30 ℃.
as the object lesson of (b) free-radical polymerised compound, can enumerate N, N '-methylene diacrylamine, two acetone acrylic acid amides, N hydroxymethyl acrylamide, N-phenyl methyl acrylamide, 2-acrylamide-2-methyl propane sulfonic acid, three (2-acryloxy ethyl) isocyanuric acid ester, N-phenylmaleimide, N-o-tolyl maleimide, tolyl maleimide between N-, N-p-methylphenyl maleimide, N-(o-methoxyphenyl) maleimide, N-(m-methoxyphenyl) maleimide, N-(p-methoxyphenyl) maleimide, N-methyl maleimide, NEM, N-octyl group maleimide, 4,4 '-ditan dimaleimide, the metaphenylene dimaleimide, 3,3 '-dimethyl-5,5 '-diethyl-4,4 '-ditan dimaleimide, the 4-methyl isophthalic acid, 3-phenylene dimaleimide, N-methacryloxy maleimide, N-acryloxy maleimide, 1,6-dimaleimide-(2,2,4-trimethylammonium) hexane, N-methacryloxy succsinic acid imide, N-acryloxy succsinic acid imide, 2-naphthyl methyl acrylate, 2-naphthyl acrylate, tetramethylol methane tetraacrylate, divinyl ethylidene urea, divinyl propylidene urea, caprolactam, vinylcarbazole, the polystyrene-based β-dimethyl-aminoethylmethacrylate of 2-, N-phenyl-N '-(3-methacryloxy-2-hydroxypropyl)-P-pHENYLENE dI AMINE, N-phenyl-N '-(3-acryloxy-2-hydroxypropyl)-P-pHENYLENE dI AMINE, two (4-ethenylphenyl) sulfone, 2-tert.-butoxy-6-vinyl naphthalene, the tetramethyl piperidine methacrylic ester, the tetramethyl piperidine acrylate, pentamethyl-piperidine methyl acrylate, pentamethyl-piperidines acrylate, the octadecyl acrylate, N tert butyl acrylamide, diacetone acrylamide, N-methylol acrylic acid amides, the represented compound of following general formula (A)～(J).In these compounds, consider preferably have the compound of (methyl) acryl from the viewpoint of rapidly-curable, consider from the viewpoint of curability at low temperatures and operability, preferred fusing point is the compound of 50～100 ℃.These compounds can use separately as required, or mix and use.
[changing 1]
(herein, l represents 1～10 integer.)
[changing 2]
Figure GPA00001040155700062
[changing 3]
Figure GPA00001040155700063
(herein, R1 represents hydrogen or methyl, and R2 represents hydrogen or methyl, and m represents 15～30 integer.)
[changing 4]
Figure GPA00001040155700064
(herein, R3 represents hydrogen or methyl, and R4 represents hydrogen or methyl, and n represents 15～30 integer.)
[changing 5]
Figure GPA00001040155700065
(herein, R5 represents hydrogen or methyl.)
[changing 6]
Figure GPA00001040155700071
(herein, R6 represents hydrogen or methyl, and o represents 1～10 integer.)
[changing 7]
(herein, R7 represents the organic group shown in hydrogen or following general formula (a), (b), and p represents 1～10 integer.)
[changing 8]
Figure GPA00001040155700073
[changing 9]
Figure GPA00001040155700074
[changing 10]
Figure GPA00001040155700075
(herein, R8 represents the organic group shown in hydrogen or following general formula (c), (d), and q represents 1～10 integer.)
[changing 11]
Figure GPA00001040155700076
[changing 12]
Figure GPA00001040155700081
[changing 13]
Figure GPA00001040155700082
(herein, R9 represents hydrogen or methyl.)
[changing 14]
(herein, R10 represents hydrogen or methyl.)
(b) addition of free-radical polymerised compound with respect to 100 mass parts (a) thermoplastic resin, is preferably 1～200 mass parts, more preferably 5～100 mass parts.During less than 1 mass parts, the thermotolerance after curing descends when addition, and the tackiness along with the film surface increases simultaneously, and operability descends.In addition, when it surpassed 200 mass parts, as film the time, film-forming properties descended, membranous the becoming fragile after solidifying simultaneously, and bonding force reduces.In the present invention, as the index of operability, can use the surface glue viscous force in the time of 25～30 ℃, and, from the operability of caking agent with by the temporary fixed property viewpoint consideration of sticky object, wish that the surface glue viscous force is below 50gf.
As (c) radical polymerization initiator used in the present invention, can use the known compound such as known superoxide or azo-compound in the past, consider from stability, viewpoint reactive, consistency, half life temperature was 90～175 ℃ in preferred 1 minute, and molecular weight is 180～1,000 superoxide.as the object lesson of this (c) radical polymerization initiator, can enumerate 1,1,3,3-tetramethyl butyl new decanoate ester peroxide, two (4-tert-butylcyclohexyl) peroxy dicarbonate, two (2-ethylhexyl) peroxy dicarbonate, the cumyl new decanoate ester peroxide, 1,1,3,3-tetramethyl butyl new decanoate ester peroxide, two bay acyl peroxides, 1-cyclohexyl-1-methylethyl new decanoate ester peroxide, uncle's hexyl new decanoate ester peroxide, tert-butyl hydroperoxide neodecanoic acid ester, the tert-butyl hydroperoxide valerate, 1，1，3，3-tetra-methylbutyl peroxy-2-ethylhexanoate, 2,5-dimethyl-2,5-two (peroxidation of 2-ethyl hexyl acyl group) hexane, uncle's hexyl peroxidation-2-ethylhexanoate, tert-butyl hydroperoxide-2-ethylhexanoate, the new heptanoate of tert-butyl hydroperoxide, t-amyl peroxy-2-ethylhexanoate, di-tert-butyl peroxide six hydrogen terephthalate, t-amyl peroxy-3,5,5 Trimethylhexanoic acid ester, 3-hydroxyl-1,1-dimethylbutyl new decanoate ester peroxide, 1，1，3，3-tetra-methylbutyl peroxy-2-ethylhexanoate, t-amyl peroxy neodecanoic acid ester, t-amyl peroxy-2-ethylhexanoate, two (3-methyl benzoyl) superoxide, the dibenzoyl superoxide, two (4-methyl benzoyl) superoxide, 2,2 '-azo two-2,4-methyl pentane nitrile, 1,1 '-azo two (1-acetoxyl group-1-diphenylphosphino ethane), 2,2 '-Diisopropyl azodicarboxylate, 2,2 '-azo two (2-methylbutyronitrile), dimethyl-2,2 '-Diisopropyl azodicarboxylate, 4,4 '-azo two (4-cyanopentanoic acid), 1,1 '-azo two (1-cyclohexane nitrile), uncle's hexyl peroxidation sec.-propyl monocarbonate, the tert-butyl hydroperoxide toxilic acid, tert-butyl hydroperoxide-3,5,5 Trimethylhexanoic acid ester, the tert-butyl hydroperoxide laurate, 2,5-dimethyl-2,5-two (peroxidation of 3-methyl benzoyl) hexane, tert-butyl hydroperoxide-2-ethylhexyl monocarbonate, uncle's hexyl peroxide benzoate, 2,5-dimethyl-2,5-two (benzoyl peroxidation) hexane, tert butyl peroxy benzoate, dibutyl peroxidation trimethyladipic acid ester, t-amyl peroxy n-caprylic acid ester, the different pelargonate of t-amyl peroxy, t-amyl peroxy benzoic ether etc.These compounds can use separately, perhaps the compound more than 2 kinds are used.
In addition, as (c) radical polymerization initiator used in the present invention, can also use the compound that produces free radical under the rayed of 150～750nm.As this compound, be not particularly limited, can use known compound, for example, Photoinitiation, Photopolymerization, andPhotocuring, J.-P.Fouassier, Hanser Publishers (nineteen ninety-five), alpha-acetamido-amphyl and the phosphinoxide put down in writing in p17～p35 are high for light-struck sensitivity, therefore more preferably.These compounds can use separately, perhaps mix use with above-mentioned superoxide or azo-compound.
The addition of (c) of the present invention radical polymerization initiator with respect to 100 mass parts (a) thermoplastic resin, is preferably 0.1～30 mass parts, and 2～20 mass parts more preferably.When radical polymerization initiator during less than 0.1 mass parts, solidify not enough, and when it surpasses 30 mass parts, shelf-stability decline.
The vinyl compound that has at least more than one phosphate as (d) used in the present invention in molecule; be not particularly limited; can use known material, more preferably have at least more than one (methyl) acryl of free-radical polymerised excellence as phosphoric acid (methyl) acrylic compound of vinyl in molecule.As this compound, can enumerate the compound shown in following general formula (K)～(M).
[changing 15]
Figure GPA00001040155700101
(herein, R11 represents acryloxy or methacryloxy, and R12 represents hydrogen or methyl, and r, s represent 1～8 integer independently.)
[changing 16]
Figure GPA00001040155700102
(herein, R13 represents acryloxy or methacryloxy, and t, u, v represent 1～8 integer independently.)
[changing 17]
Figure GPA00001040155700103
(herein, R14 represents acryloxy or methacryloxy, and R15 represents hydrogen or methyl, and w, x represent 1～8 integer independently.)
the object lesson that has the vinyl compound of at least more than one phosphate as (d) in molecule, can enumerate acid phosphorus acyloxy ethyl-methyl acrylate, acid phosphorus acyloxy ethyl propylene acid esters, acid phosphorus acyloxy propyl methyl acid esters, acid phosphorus acyloxy polyoxyethylene glycol monomethacrylates, acid phosphorus acyloxy polyoxy propylene glycol monomethyl acrylate, 2-(methyl) acryloxy ethyl phosphonic acid ester, 2, 2 '-two (methyl) acryloxy diethyl phosphoric acid ester, EO modified phosphate dimethacrylate, the phosphoric acid modification epoxy acrylate, phosphoric acid ethene alcohol ester etc.
When interpolation (d) had the vinyl compound of at least more than one phosphate in molecule, its addition was preferably 0.05～30 mass parts, more preferably 0.1～20 mass parts with respect to 100 mass parts (a) thermoplastic resin.During less than 0.05 mass parts, be difficult to obtain high-adhesive-strength when addition, and when it surpassed 30 mass parts, the caking agent physical property after curing reduced significantly, reliability may descend.
As (e) electroconductive particle used in the present invention, can enumerate the metallicss such as Au, Ag, Ni, Cu, scolding tin or carbon etc.In addition, can also be take dielectric glass, pottery, plastics etc. as core, and be coated with the material that above-mentioned metal, metallics or carbon form on this core.When electroconductive particle is take plastics as core, and when being coated with material that above-mentioned metal, metallics or carbon forms or hot molten metal particle on this core, owing to having deformability under heating and pressurizing, when therefore connecting and the contact area of electrode increase, reliability improves, and is therefore preferred.In addition, further with the particulate of the surperficial gained of these electroconductive particles of coating such as macromolecule resin, when increasing the electroconductive particle use level, can suppress the short circuit that produces because of particle contact each other, improve the insulativity between telegraph circuit, therefore can suitably use separately, or mix use with electroconductive particle.
Be somebody's turn to do the median size of (e) electroconductive particle, consider from viewpoint dispersed, electroconductibility, be preferably 1～18 μ m.
(e) addition of electroconductive particle, be not particularly limited, and take the cumulative volume of adhesive composite as benchmark, is preferably 0.1～30 volume %, more preferably 0.1～10 volume %.When this is worth less than 0.1 volume %, have the tendency of electroconductibility variation, when it surpasses 30 volume %, have the tendency that produces short circuit.In addition, the volume of each composition before the curing when volume % is based on 23 ℃ determines, the volume of each composition can utilize proportion to be scaled volume by weight.In addition, can also will not dissolve or this composition of swelling, but the appropriate solvent of wetting this composition (water, alcohol etc.) is put into graduated cylinder well, then adds this composition, obtain the volume of increase, and with it as described volume.
In order to improve crosslinking rate and the toughness of guaranteeing cured article, caking agent of the present invention in the above-mentioned free-radical polymerised compound that below 30 ℃ is solid, can also suitably add multifunctional (methyl) acrylic compound.
as the object lesson of multifunctional (methyl) acrylic compound, can enumerate epoxy group(ing) (methyl) origoester acrylate, urethane (methyl) origoester acrylate, polyethers (methyl) origoester acrylate, the oligopolymer such as polyester (methyl) origoester acrylate, trimethylolpropane tris (methyl) acrylate, polyoxyethylene glycol two (methyl) acrylate, polyalkylene glycol two (methyl) acrylate, dicyclopentenyl (methyl) acrylate, two cyclopentenes oxygen base ethyl (methyl) acrylate, neopentyl glycol two (methyl) acrylate, Dipentaerythritol six (methyl) acrylate, isocyanuric acid modification 2 officials' energy (methyl) acrylate, isocyanuric acid modification 3 officials' energy (methyl) acrylate, two phenoxyethyl alcohol fluorenes acrylate, on the glycidyl of bisphenol fluorene diglycidylether addition (methyl) acrylic acid epoxy group(ing) (methyl) acrylate, on the glycidyl of bisphenol fluorene diglycidylether addition ethylene glycol or propylene glycol and import the compound that (methyl) acryloxy forms in the compound that obtains, following general formula (N), (O) compound shown in etc. multifunctional (methyl) acrylic compound.These compounds can use separately as required, perhaps mix and use.
[changing 18]
(herein, R16 represents hydrogen or methyl, and R17 represents hydrogen or methyl, and y represents 1～8 integer, and z represents 1～8 integer.)
[changing 19]
Figure GPA00001040155700122
(herein, R18 represents hydrogen or methyl, and R19 represents hydrogen or methyl, and a represents 1～8 integer, and b represents 0～8 integer.)
In order further to control curing speed and to improve package stability, can suitably add stablizer in caking agent of the present invention.As this stablizer, be not particularly limited, can use known compound, the phenol derivativess, 2,2 such as quinone derivative, 4-methoxyphenol, 4-tert-butyl catechol such as preferred benzoquinones, quinhydrones, 6,6-tetramethyl piperidine-1-oxygen base, 4-hydroxyl-2, the steric hindrance sulfonamide derivativess such as aminooxy (aminoxyl) derivative, tetramethyl-piperidyl methacrylic ester such as 2,6,6-tetramethyl piperidine-1-oxygen base.
When adding stablizer, its addition is preferably 0.01～30 mass parts, more preferably 0.05～10 mass parts with respect to 100 mass parts (a) thermoplastic resin.During less than 0.01 mass parts, additive effect may significantly descend when addition, and when it surpasses 30 mass parts, and the consistency of other composition may descend.
In caking agent of the present invention, can also suitably add the bonding auxiliary agents such as coupling agent take alkoxyl silicone alkane derivatives or silazane derivative as representative and adhesion promoters, flow agent, urea resin, melamine resin.As bonding auxiliary agent, be preferably the compound shown in following general formula (P), and they can use separately, or the compound more than 2 kinds is used.
[changing 20]
Figure GPA00001040155700131
(herein, R20, R21, R22 represent that independently hydrogen, carbon number are that 1～5 alkyl, carbon number are that 1～5 alkoxyl group, carbon number are 1～5 alkoxy carbonyl, aryl, R23 represents (methyl) acryloxy, vinyl, isocyanate group, imidazolyl, sulfydryl, amino, methylamino, dimethylamino, benzylamino, phenyl amino, cyclohexyl amino, morpholinyl, piperazinyl, uride base, glycidyl, and c represents 1～10 integer.)
In order to relax stress and to improve cementability, in caking agent of the present invention, can add rubber constituent.object lesson as rubber constituent, can enumerate polyisoprene, polyhutadiene, the C-terminal polyhutadiene, the C-terminal polyhutadiene, 1, the 2-polyhutadiene, C-terminal 1, the 2-polyhutadiene, C-terminal 1, the 2-polyhutadiene, acrylic rubber, styrene butadiene rubbers, the C-terminal styrene butadiene rubbers, acrylonitrile-butadiene rubber, contain carboxyl in polymer ends, hydroxyl, the acrylonitrile-butadiene rubber of (methyl) acryl or morpholinyl, carboxylated nitrile rubber, C-terminal gathers (oxypropylene), the alkoxysilyl end gathers (oxypropylene), poly-(oxygen tetramethylene) glycol, polyolefin diols, poly-epsilon-caprolactone, acrylic rubber.
As above-mentioned rubber constituent, consider from the viewpoint that cementability improves, be preferably the cyano group that contains as high polar group, the rubber constituent of carboxyl on side chain or end, further, consider from the viewpoint that mobility improves, more preferably aqueous rubber.
Object lesson as aqueous rubber; can enumerate aqueous acrylonitrile-butadiene rubber; the aqueous acrylonitrile-butadiene rubber that contains carboxyl, hydroxyl, (methyl) acryl or morpholinyl in polymer ends; aqueous carboxylated nitrile rubber is preferably 10～60% rubber as the acrylonitrile content of polar group.These compounds can use separately, or the compound more than 2 kinds is used.
Caking agent of the present invention when being at room temperature aqueous, can use with pasty state.When at room temperature being solid, except heating is used, use after can also using solvent with its gelatinization.As available solvent, so long as there is no reactivity with adhesive composite and additive, and demonstrate sufficient deliquescent material, just be not particularly limited, preferably the boiling point under normal pressure is the solvent of 50～150 ℃., may volatilize when at room temperature placing during less than 50 ℃ when boiling point, thereby use in open system and be restricted.In addition, when boiling point surpassed 150 ℃, solvent was difficult to volatilization, may produce detrimentally affect to the reliability after bonding.
Caking agent of the present invention can also form membranaceous the use.Adhesive composite, solution coat that can be by will add as required solvent etc. is on the separability base materials such as fluororesin film, polyethylene terephthalate film, release paper, perhaps make the base materials such as mentioned solution immersion non-woven fabrics, and be placed on the separability base material, desolventizings etc. are used thereby form film.When using with the shape of film, consider from viewpoints such as operability, more convenient.
Above-mentioned caking agent by with heating and pressurization and use, can make by sticky object bonding.Heating temperature is not particularly limited, and for example, can be 100～250 ℃, in order fully to suppress when solidifying heating to the detrimentally affect that parts on every side produce, is preferably 100～180 ℃.Pressure so long as can just not be not particularly limited produced the scope of damage by sticky object, is preferably 0.1～10MPa usually.The time of these heating and pressurization can be for 0.5 second～120 second, considered from the viewpoint of cost degradation, was preferably for 0.5 second～10 second.For example, can be undertaken bonding by 140～200 ℃, 3MPa, the heating in 10 seconds.
Caking agent of the present invention can be as different not of the same race by the caking agent of sticky object of thermal expansivity.Specifically, can be used as anisotropically conducting adhesive, circuit connection material take silver paste, silverskin etc. as representative, CSP is the semiconductor element adhesives of representative with elastomerics, CSP with end underfill material, chips welding (die bonding) film, chips welding paste etc.
The syndeton body of circuit block of the present invention, be first circuit block that will have the first splicing ear and the second circuit component configuration with second splicing ear become to make the first splicing ear relative with the second splicing ear to, above-mentioned caking agent is present between first splicing ear and the second splicing ear of subtend configuration, carry out heating and pressurizing, the syndeton body that the first splicing ear and the second splicing ear are electrically connected to.
Fig. 1 means the summary sectional view of an embodiment of the syndeton body of circuit block of the present invention.As shown in Figure 1, the syndeton body of present embodiment, have toward each other to the first circuit block 20 and second circuit parts 30, and between the first circuit block 20 and second circuit parts 30, be provided with the electric circuit connection member 10 that they are connected.
The first circuit block 20 has circuit substrate (the first circuit substrate) 21 and formed circuit electrode (the first circuit electrode) 22 on the interarea 21a of circuit substrate 21.In addition, on the interarea 21a of the first circuit substrate 21, can according to circumstances form insulation layer (not shown).
On the other hand, second circuit parts 30 have circuit substrate (second circuit substrate) 31 and formed circuit electrode (second circuit electrode) 32 on the interarea 31a of circuit substrate 31.In addition, on the interarea 31a of circuit substrate 31, also can according to circumstances form insulation layer (not shown).
As the first and second circuit blocks 20,30, as long as be formed with the electrode that needs electrical connection, just be not particularly limited.Specifically, can enumerate and form the glass of electrode or plastic base, printed-wiring board (PWB), ceramic circuit-board, flex circuit application, semiconductor silicon chips etc. for liquid-crystal display by ITO etc.They can be used in combination as required.In the present embodiment, mainly use printed-wiring board (PWB) and by the formed material of the organism such as polyimide, and can use metal or ITO (indium tinoxide), the silicon nitride (SiN such as copper, aluminium x), silicon-dioxide (SiO 2) etc. inorganic etc. have the circuit block of kinds of surface state.
Electric circuit connection member 10 is formed by the cured article of above-mentioned caking agent.This electric circuit connection member 10 contains resin 11 and electroconductive particle 7.Electroconductive particle 7 not only be configured in relatively to circuit electrode 22 and circuit electrode 32 between, but also be configured between interarea 21a, 31a.In the syndeton of circuit block, circuit electrode 22,32 is electrically connected by electroconductive particle 7.That is, electroconductive particle 7 and circuit electrode 22,32 the two directly contact.
Herein, electroconductive particle 7 is foregoing (e) electroconductive particles, and resin 11 is cured articles of above-mentioned caking agent.
In the syndeton of this circuit block, as mentioned above, relatively to circuit electrode 22 and circuit electrode 32 be electrically connected by electroconductive particle 7.Therefore, the contact resistance between circuit electrode 22,32 is fully reduced.Thereby the electric current between circuit electrode 22,32 can smooth and easyly pass through, and can give full play to the function that circuit has.In addition, when electric circuit connection member 10 does not contain electroconductive particle 7, directly contact with circuit electrode 32 by making circuit electrode 22, and be electrically connected to.
The manufacture method of the syndeton body of present embodiment, namely circuit block 20,30 method of attachment, for example as described below.At first, above-mentioned caking agent is present between circuit block 20,30.At this moment, circuit block 20,30 is configured to make circuit electrode 22 relative with 32 to.Then, on one side across circuit block 20,30 caking agent, pressurize on their stack direction on one side, implement the solidification treatment of caking agent, form electric circuit connection member 10.Solidification treatment can carry out under example Heating temperature described above, moulding pressure, and its method can suitably be selected according to caking agent.
Because the cured article of electric circuit connection member 10 by above-mentioned caking agent consists of, so electric circuit connection member 10 fully improves with respect to the bonding strength of circuit block 20 or 30, and can fully be suppressed at the reduction of the connection reliability under hot and humid environment.
In addition, although be described for the situation that contains electroconductive particle in the above-described embodiment, the syndeton body of circuit block of the present invention also can not contain electroconductive particle.When not containing electroconductive particle, by directly being contacted mutually, relative electrode is electrically connected to.
Embodiment
Below, illustrate the present invention based on embodiment, but the present invention is not limited thereto.
[synthesizing of urethane resin]
Be that 2000 polybutylene adipate diol, 450 mass parts molecular-weight average are 2000 polytetramethylene glycol and 100 mass parts 1 with 450 mass parts weight-average molecular weight, the 4-butyleneglycol, be dissolved in 4000 mass parts methylethylketones, and add 390 mass parts diphenylmethanediisocyanates, make it 70 ℃ of reactions 60 minutes, obtain urethane resin.Measure the weight-average molecular weight of the urethane resin of gained by gel permeation chromatography (GPC), result is 100,000.
(embodiment 1～9, comparative example 1～3)
As thermoplastic resin, it is the solution of 30 % by weight that above-mentioned urethane resin is dissolved in the solids component that forms in the mixed solvent of methylethylketone and toluene, with the phenoxy resin (ZX-1356-2 that is dissolved in take solids component as 40 % by weight in methylethylketone, Toto Kasei KK's trade(brand)name processed) or be dissolved in the polyester urethane resin (UR-1350, Toyo Boseki K.K's trade(brand)name processed) in the mixed solvent of methylethylketone and toluene take solids component as 40 % by weight and use.
As free-radical polymerised compound, use separately under 30 ℃ epoxy acrylate (VR-60 and VR-90 as solid, Showa Highpolymer Co., Ltd's trade(brand)name processed), perhaps will be as the isocyanuric acid EO modification triacrylate (M-215 of aqueous free-radical polymerised compound, Toagosei Co., Ltd's trade(brand)name processed) and ammonia ester acrylate (UA6100, Xin Zhong village KCC trade(brand)name processed) and use.
As acidic cpd, use 2-(methyl) acryloxy ethyl phosphonic acid ester (light ester (ラ ィ ト ェ ス テ Le) P-2M, common prosperity Co., Ltd. of society trade(brand)name processed).
As radical polymerization initiator, use uncle's hexyl peroxidation-2-ethylhexanoate (PERHEXYL O, NOF Corp's trade(brand)name processed).
In addition, be produced on and be provided with thickness on the particle surface take polystyrene as core and be the nickel dam of 0.2 μ m, and in the arranged outside of this nickel dam, thickness to be arranged be the gold layer of 0.02 μ m, and median size is that 4 μ m, proportion are 2.5 electroconductive particle.
Match well to close with the solid weight shown in following table 1 and state composition, then the amount cooperation of above-mentioned electroconductive particle with 1.5 volume % disperseed.Use apparatus for coating that it is coated on the fluororesin film that thickness is 80 μ m, and 70 ℃ of warm air dryings 10 minutes, the thickness that obtains bond layer was the film-like adhesive of the embodiment 1～9 of 18 μ m, comparative example 1～3.
[table 1]
Use viscosity test machine (the レ ス カ of Co., Ltd. system, LT25A-500) (basal temperature is 30 ℃), and measure the surface glue viscous force of the film-like adhesive of embodiment 1～9, comparative example 1～3 according to JISZ-0237.
[mensuration of contact resistance, bonding strength]
Film-like adhesive with embodiment 1～9, comparative example 1～3, be arranged on that to have 500 live widths be that 25 μ m, spacing are that 50 μ m, thickness are that (thickness is 1.1mm, and surface resistivity is between 20 Ω/) for the flex circuit application (FPC) of the copper circuit of 12 μ m and the glass that is formed with 0.2 μ m Indium sesquioxide (ITO) thin layer.Using hot-press arrangement (type of heating: permanent pattern of fever, Dongli Engineering Co., Ltd makes), is to connect on 2mm described material at width 10 seconds of heating and pressurizing under 160 ℃, 3MPa, makes linker.
At once and at 85 ℃, the hot and humid middle maintenance of 85%RH after 168 hours (after test), use the resistance value between the adjacent circuit of this linker of multitester measuring after bonding.Resistance value represents with the mean value of 37 place's resistance between adjacent circuit.
In addition, according to JIS-Z0237, use 90 degree stripping methods to measure the bonding strength of this linker, and estimate.Herein, the determinator of bonding strength uses Japan ボ uncommon grand (テ Application シ ロ Application) UTM-4 (peeling rate 50mm/min, 25 ℃) in one Le De ゥ ィ Application Co., Ltd. sky processed.The measurement result of surface glue viscous force, contact resistance and the bonding strength of the film-like adhesive that as above carries out is shown in following table 2.
[table 2]
Figure GPA00001040155700191
Hence one can see that, the adhesive composite of embodiment 1～9 gained, when 160 ℃ of Heating temperatures, at once and keep 168 hours in 85 ℃, the hot and humid groove of 85%RH after (after test), demonstrate approximately following good contact resistance and the above good bonding intensity of 400N/m of 3 Ω after bonding.Further, hence one can see that, and the surface glue viscous force of the gluing degree of presentation surface is low, and operability is excellent.
On the contrary as can be known, do not use in the present invention under 30 ℃ the comparative example 1 as the free-radical polymerised compound of solid, its surface glue viscous force is high, and operability is poor, and in addition, bonding strength is also low.And as can be known, in comparative example 2,3, although demonstrated good contact resistance and bonding strength, the surface glue viscous force is large, and has problem aspect operability.

Claims (6)

1. caking agent, it contains (a) thermoplastic resin, (b) free-radical polymerised compound, (c) radical polymerization initiator, (d) have the vinyl compound of at least more than one phosphate and (e) electroconductive particle in molecule, described (b) free-radical polymerised compound comprises epoxy acrylate, described (b) free-radical polymerised compound is being solid below 30 ℃, described (a) thermoplastic resin contains polyester urethane resin, the resin that described (a) thermoplastic resin is mixed with two or more.
2. caking agent as claimed in claim 1, wherein, (a) thermoplastic resin contains at least a resin that is selected from phenoxy resin, vibrin, urethane resin, butyral resin, acrylic resin, polyimide resin.
3. caking agent as claimed in claim 1, wherein, (b) free-radical polymerised compound is the compound that has (methyl) acryl more than in molecule.
4. caking agent as claimed in claim 1, wherein, (b) free-radical polymerised compound comprises N, N '-methylene diacrylamine, N-phenyl methyl acrylamide, 2-acrylamide-2-methyl propane sulfonic acid, three (2-acryloxy ethyl) isocyanuric acid ester, N-phenylmaleimide, N-o-tolyl maleimide, tolyl maleimide between N-, N-p-methylphenyl maleimide, N-(o-methoxyphenyl) maleimide, N-(m-methoxyphenyl) maleimide, N-(p-methoxyphenyl) maleimide, N-methyl maleimide, NEM, N-octyl group maleimide, 4,4 '-ditan dimaleimide, the metaphenylene dimaleimide, 3,3 '-dimethyl-5,5 '-diethyl-4,4 '-ditan dimaleimide, the 4-methyl isophthalic acid, 3-phenylene dimaleimide, N-methacryloxy maleimide, N-acryloxy maleimide, 1,6-dimaleimide-(2,2,4-trimethylammonium) hexane, N-methacryloxy succinimide, N-acryloxy succinimide, 2-naphthyl methyl acrylate, 2-naphthyl acrylate, tetramethylol methane tetraacrylate, divinyl ethylidene urea, divinyl propylidene urea, caprolactam, vinylcarbazole, the polystyrene-based β-dimethyl-aminoethylmethacrylate of 2-, N-phenyl-N '-(3-methacryloxy-2-hydroxypropyl)-P-pHENYLENE dI AMINE, N-phenyl-N '-(3-acryloxy-2-hydroxypropyl)-P-pHENYLENE dI AMINE, two (4-ethenylphenyl) sulfone, 2-tert.-butoxy-6-vinyl naphthalene, the tetramethyl piperidine methacrylic ester, the tetramethyl piperidine acrylate, pentamethyl-piperidine methyl acrylate, pentamethyl-piperidines acrylate, the octadecyl acrylate, N tert butyl acrylamide, diacetone acrylamide, N-methylol acrylic acid amides, the represented compound of following general formula (A)～(J),
In formula (A), the integer of 1 expression 1～10;
Figure FSB00000947599300022
In formula (C), R1 represents hydrogen or methyl, and R2 represents hydrogen or methyl, and m represents 15～30 integer;
Figure FSB00000947599300023
In formula (D), R3 represents hydrogen or methyl, and R4 represents hydrogen or methyl, and n represents 15～30 integer;
Figure FSB00000947599300024
In formula (E), R5 represents hydrogen or methyl;
Figure FSB00000947599300031
In formula (F), R6 represents hydrogen or methyl, and o represents 1～10 integer;
Figure FSB00000947599300032
In formula (G), R7 represents the organic group shown in hydrogen or following general formula (a), (b), and p represents 1～10 integer;
In formula (H), R8 represents the organic group shown in hydrogen or following general formula (c), (d), and q represents 1～10 integer;
Figure FSB00000947599300034
Figure FSB00000947599300041
In formula (I), R9 represents hydrogen or methyl;
Figure FSB00000947599300042
In formula (J), R10 represents hydrogen or methyl.
5. caking agent as claimed in claim 4, wherein, (b) free-radical polymerised compound comprises that fusing point is the compound of 50～100 ℃.
6. the syndeton body of a circuit block, it is, first circuit block that will have the first splicing ear and the second circuit component configuration with second splicing ear become to make described the first splicing ear relative with described the second splicing ear to, the described caking agent of claim 1～5 any one is present between described first splicing ear and described the second splicing ear of subtend configuration, carry out heating and pressurizing, described the first splicing ear and described the second splicing ear are electrically connected to form.
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