WO2022153925A1 - 導電性組成物、導電性ペースト、電気回路、可撓性電気回路体及び成型体の製造方法 - Google Patents
導電性組成物、導電性ペースト、電気回路、可撓性電気回路体及び成型体の製造方法 Download PDFInfo
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- WO2022153925A1 WO2022153925A1 PCT/JP2022/000294 JP2022000294W WO2022153925A1 WO 2022153925 A1 WO2022153925 A1 WO 2022153925A1 JP 2022000294 W JP2022000294 W JP 2022000294W WO 2022153925 A1 WO2022153925 A1 WO 2022153925A1
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- Prior art keywords
- conductive
- conductive paste
- electric circuit
- thermoplastic resin
- molding
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000002245 particle Substances 0.000 claims abstract description 65
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 53
- 239000002904 solvent Substances 0.000 claims abstract description 45
- 230000009477 glass transition Effects 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 57
- 238000000465 moulding Methods 0.000 claims description 57
- 229920005668 polycarbonate resin Polymers 0.000 claims description 32
- 239000004431 polycarbonate resin Substances 0.000 claims description 32
- 229920005989 resin Polymers 0.000 claims description 29
- 239000011347 resin Substances 0.000 claims description 29
- HJOVHMDZYOCNQW-UHFFFAOYSA-N isophorone Chemical compound CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 claims description 24
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 16
- 229910052709 silver Inorganic materials 0.000 claims description 16
- 239000004332 silver Substances 0.000 claims description 16
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 10
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 10
- 238000009835 boiling Methods 0.000 claims description 10
- -1 poly (4,4'-cyclohexylidenediphenyl) carbonate Polymers 0.000 claims description 10
- 239000001294 propane Substances 0.000 claims description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 claims description 3
- XXJWXESWEXIICW-UHFFFAOYSA-N diethylene glycol monoethyl ether Chemical compound CCOCCOCCO XXJWXESWEXIICW-UHFFFAOYSA-N 0.000 claims description 3
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 claims description 3
- XIPFMBOWZXULIA-UHFFFAOYSA-N pivalamide Chemical compound CC(C)(C)C(N)=O XIPFMBOWZXULIA-UHFFFAOYSA-N 0.000 claims description 3
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 claims description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 238000009429 electrical wiring Methods 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 17
- 238000010438 heat treatment Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 238000001035 drying Methods 0.000 description 10
- 238000007639 printing Methods 0.000 description 8
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 7
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- 238000005452 bending Methods 0.000 description 6
- 238000007650 screen-printing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 238000007666 vacuum forming Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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- 230000003746 surface roughness Effects 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
- C08G64/04—Aromatic polycarbonates
- C08G64/06—Aromatic polycarbonates not containing aliphatic unsaturation
-
- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/0283—Stretchable printed circuits
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
-
- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0393—Flexible materials
-
- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
- H05K1/095—Dispersed materials, e.g. conductive pastes or inks for polymer thick films, i.e. having a permanent organic polymeric binder
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/01—Dielectrics
- H05K2201/0104—Properties and characteristics in general
- H05K2201/0129—Thermoplastic polymer, e.g. auto-adhesive layer; Shaping of thermoplastic polymer
Definitions
- the present invention relates to a conductive composition for forming electrodes, wiring, etc. of electric circuits, electronic circuits, etc.
- Patent Document 1 describes a polymer thick film conductive composition containing (a) 30 to 70 wt% silver, (b) a first organic medium, and (c) a second organic medium. ing.
- the first organic medium is (b) 10 to 40 wt% of the first organic containing 10 to 50 wt% of a thermoplastic urethane resin dissolved in the first organic solvent. It is described that the weight percent of the thermoplastic urethane resin of the medium is based on the total weight of the first organic medium.
- the second organic medium is a 10 to 40 wt% second organic medium containing a 10 to 50 wt% thermoplastic polyhydroxy ether resin dissolved in an organic solvent.
- the weight percent of the thermoplastic polyhydroxy ether resin is based on the total weight of the second organic medium.
- the weight percent of the silver, the first organic medium and the second organic medium is the total weight of the polymer thick film conductive composition. Is based.
- Patent Document 2 describes a resin composition containing (A) conductive particles, (B) a thermoplastic polyurethane resin having a 100% modulus of 7 MPa or more, and (C) a solvent. Patent Document 2 describes that the ratio of (A) conductive particles to the total of (A) conductive particles and (B) thermoplastic polyurethane resin is 90% by weight or more and less than 100% by weight. ..
- a conductive paste containing a thermoplastic polyurethane resin as the conductive paste that forms the wiring of the electronic circuit on the surface of the base material that can be stretched and / or bent.
- a crack occurs in a portion of the fine wire pattern (for example, a thin wire having a width of 1 mm), and the electric wiring is broken. It turned out that there was a problem.
- the present invention provides a conductive composition and conductivity capable of forming an electric wiring having a low possibility of disconnection even when the electric wiring of an electric circuit and / or an electronic circuit is extended and / or bent. It is an object of the present invention to provide a sex paste. Further, the present invention is a conductive composition capable of forming an electric wiring having a low possibility of disconnection even when an electric wiring of an electric circuit and / or an electronic circuit is formed by using molding. And to provide a conductive paste.
- the embodiment of the present invention has the following configuration.
- the configuration 1 of the present embodiment contains (A) conductive particles, (B) a thermoplastic resin, and (C) a solvent, and the glass transition point of the (B) thermoplastic resin is 140 to 200 ° C. It is a conductive composition.
- (Structure 2) Configuration 2 of the present embodiment is the conductive composition of Configuration 1 in which the thermoplastic resin (B) contains a polycarbonate resin.
- thermoplastic resin (B) is poly (4,4'-cyclohexylidenediphenyl) carbonate and copoly [2,2-bis (4-hydroxyphenyl) propane / 2,2-.
- a conductive composition of composition 1 or 2 comprising at least one selected from bis (4-hydroxy-3-methylphenyl) propane] carbonate.
- (Structure 4) Configuration 4 of the present embodiment is the conductive composition according to any one of configurations 1 to 3, wherein the solvent (C) has a boiling point of 200 ° C. or higher.
- the solvent (C) contains at least one selected from isophorone, 3methoxyN, N dimethylpropanamide, benzyl alcohol, butyl carbitol, ethyl carbitol acetate and tetraglyme. It is a conductive composition according to any one of the configurations 1 to 4.
- the weight ratio of the (A) conductive particles to the (B) thermoplastic resin ((A) weight of the conductive particles: (B) weight of the thermoplastic resin) is 99.
- Configuration 7 of the present embodiment is the conductive composition according to any one of configurations 1 to 6, wherein the conductive particles (A) are silver particles.
- Configuration 8 of this embodiment is a conductive paste containing the conductive composition according to any one of configurations 1 to 7.
- the configuration 9 of the present embodiment is the conductive paste of the configuration 8 and is a conductive paste for forming a flexible electric circuit body.
- Configuration 10 of this embodiment is the conductive paste of configuration 8 and is a conductive paste for in-mold electronics.
- Configuration 11 of this embodiment is an electric circuit containing a cured product of the conductive paste according to any one of configurations 8 to 10.
- the configuration 12 of the present invention is a flexible electric circuit body including a flexible base material and the electric circuit of the configuration 11 arranged on the flexible base material.
- an electric circuit is formed on the surface of the flexible base material by using the conductive paste according to any one of the configurations 8 to 10, and the flexible base material on which the early electric circuit is formed is formed.
- This is a method for manufacturing a molded body, which includes forming a molded body by molding the molding resin and the molding resin.
- a conductive composition and a conductive paste capable of forming an electric wiring having a low possibility of disconnection even when the electric wiring of an electric circuit and / or an electronic circuit is extended and / or bent. can be provided. Further, according to the present invention, a conductive composition capable of forming an electric wiring having a low possibility of disconnection even when an electric wiring of an electric circuit and / or an electronic circuit is formed by using molding. And a conductive paste can be provided.
- This embodiment is a conductive composition containing (A) conductive particles, (B) a thermoplastic resin, and (C) a solvent.
- the glass transition point of the (B) thermoplastic resin contained in the conductive composition of the present embodiment is 140 to 200 ° C.
- the conductive composition (for example, conductive paste) of the present embodiment contains a predetermined component, the electrodes and wiring of an electric circuit and / or an electronic circuit (sometimes simply referred to as an "electric circuit") and the like (simply). Even when (also referred to as “electrical wiring”) is extended and / or bent, it is possible to form an electric wiring having a low possibility of disconnection. Further, the conductive composition of the present embodiment (for example, a conductive paste) can form an electric wiring having a low possibility of disconnection even when forming an electric wiring by using molding. ..
- the "flexible base material” means a material to be printed when printing an electric wiring pattern included in an electric circuit using a conductive paste.
- the flexible base material is also simply referred to as a "base material”.
- the flexible base material since the “flexible base material” is generally in the shape of a flat sheet or a film, the flexible base material may be referred to as a "flat sheet” or a “film”. ..
- a preferred specific example of the flexible base material is a flat sheet (film) made of a polycarbonate resin, a polyethylene terephthalate (PET) resin, and / or an acrylic resin.
- a flexible base material is a base material having flexibility that can be deformed such as stretching and / or bending when heated to at least a predetermined temperature. Therefore, the flexible base material does not have to be flexible at room temperature (for example, 30 ° C. or lower).
- the predetermined temperature when heated is, for example, 140 ° C. to 180 ° C.
- the "flexible electric circuit body” means that an electric wiring pattern (electric circuit pattern) is printed on the surface of a flexible base material (flat sheet or film) using a conductive paste and printed. This is a dried and solidified conductive paste.
- the flexible electric circuit body can be used for molding.
- Flexible electric circuits including flexible substrates are flexible when heated to at least a predetermined temperature. Therefore, the flexible electric circuit body does not have to have flexibility at room temperature (for example, 30 ° C. or lower). Similar to the flexible substrate, the predetermined temperature when heated is, for example, 140 ° C. to 180 ° C.
- the "molded body” refers to a flexible electric circuit body (flat sheet or film having an electric wiring pattern) molded together with another resin (molding resin). Molding means a processing method for processing a material into a predetermined shape using a mold, such as heat molding, pressure molding, and vacuum forming.
- the conductive paste of this embodiment is preferably a conductive paste for in-mold electronics.
- in-molding a technique of laminating a flat sheet-like or film-like base material at the same time as molding.
- In-Mold Electronics IME
- In-mold electronics is a technique for producing a molded body in which electrical wiring is integrated by forming an electric wiring pattern (flexible electric circuit body) on a flat sheet-like or film-like base material and molding it by in-molding. Is.
- the conductive paste of the present embodiment it is possible to form an electric wiring having a low possibility of disconnection even when the base material is stretched and / or bent. Therefore, the conductive paste of the embodiment can be preferably used as the conductive paste for in-mold electronics.
- the conductive composition of the present embodiment contains conductive particles as the component (A).
- the conductive particles contained in the conductive composition of the present embodiment are silver (Ag), gold (Au), copper (Cu), palladium (Pd), nickel (Ni), titanium (Ti) and carbon (C). It is preferable to include at least one selected from.
- the conductive particles contained in the conductive composition of the present embodiment consist of at least one selected from silver (Ag), gold (Au), copper (Cu), palladium (Pd) and carbon (C). Is more preferable.
- silver (Ag) has high electrical conductivity. Therefore, it is preferable to use silver (Ag) particles (that is, conductive particles made of silver) as the conductive particles. By using silver particles as the conductive particles, it is possible to form an electric wiring having a low electric resistance.
- conductive particles made of silver means that components other than silver are not intentionally added, and that the conductive particles inevitably contain impurities. Tolerate. The same applies to conductive particles made of a metal other than silver and components other than the conductive particles.
- the particle shape and particle size (also referred to as particle size or particle size) of the conductive particles are not particularly limited.
- the particle shape for example, spherical particles, phosphorus flakes, and the like can be used.
- the particle size of the conductive particles can be defined by the particle size (D50) of 50% of the integrated value of all the particles. In the present specification, D50 is also referred to as an average particle size.
- the average particle size (D50) can be obtained from the result of the particle size distribution measurement obtained by measuring the particle size distribution by the microtrack method (laser diffraction / scattering method).
- the average particle diameter (D50) of the conductive particles is preferably 0.1 to 30 ⁇ m, more preferably 0.2 to 20 ⁇ m, from the viewpoint of resistance to elongation and / or bending and workability. It is more preferably 0.5 to 15 ⁇ m, and particularly preferably 0.8 to 10 ⁇ m. If the average particle size (D50) is larger than the above range, problems such as clogging may occur during screen printing. Further, when the average particle size is smaller than the above range, the particles may be excessively sintered during firing, and it may be difficult to form an electric wiring having resistance to elongation and / or bending. ..
- the size of the conductive particles can be expressed as a BET value (BET specific surface area).
- the BET value of the conductive particles is preferably 0.1 to 10 m 2 / g, more preferably 0.2 to 5 m 2 / g, and even more preferably 0.5 to 3 m 2 / g.
- the conductive composition of the present embodiment contains a thermoplastic resin as the component (B).
- the glass transition point of the thermoplastic resin contained in the conductive composition of the present embodiment is 140 to 200 ° C, preferably 140 to 190 ° C.
- the glass transition point of the thermoplastic resin can be measured by the differential scanning calorimetry (DSC).
- the temperature during general heat molding of in-mold electronics is 140 ° C. to 180 ° C.
- the temperature during pressure molding is 140 ° C. to 160 ° C.
- the temperature during vacuum forming is 180 ° C.
- the conductive composition of the present embodiment preferably contains a polycarbonate resin as the (B) thermoplastic resin having a glass transition point of 140 to 200 ° C.
- the thermoplastic resin is more preferably made of a polycarbonate resin.
- a predetermined electric wiring is printed on a flat sheet (film) of a polycarbonate resin, and the flat sheet is used for molding, whereby a molded body having the electric wiring can be manufactured.
- the thermoplastic resin contains the polycarbonate resin, it is possible to improve the followability of the electric wiring to the deformation of the flat sheet at the time of molding. Therefore, the possibility of disconnection of the electrical wiring can be reduced.
- the present inventors cause cracks in the fine wire pattern (for example, 1 mm wide fine wire), which causes electricity. We obtained the finding that there is a problem that the wiring is broken.
- the present inventors examined various materials used for the conductive paste for forming electrical wiring by heat molding.
- a thermoplastic resin having a glass transition point of 140 to 200 ° C. as the thermoplastic resin contained in the conductive paste, the present inventors can form an electric wiring having a low possibility of disconnection by heat molding.
- a base material flat sheet or film
- the material of the base material is not particularly limited as long as it is a base material that can be heat-molded.
- the material of the base material preferably includes a base material using a polycarbonate resin, polyethylene terephthalate (PET), and an acrylic resin.
- the deformation of the electrical wiring pattern during heat molding can be caused by deforming the flat sheet or film. It becomes easy to follow the deformation. Therefore, the possibility of disconnection of the electrical wiring can be reduced.
- the elongation of the flat sheet or film during heat molding becomes conductive. It can appropriately follow the elongation of the resin component of the sex paste. Therefore, the possibility of disconnection of the electrical wiring can be further reduced.
- thermoplastic resin (polycarbonate resin) contained in the conductive composition of the present embodiment is poly (4,4'-cyclohexylidenediphenyl) carbonate and copoly [2,2-bis (4-hydroxyphenyl) propane / 2). , 2-Bis (4-hydroxy-3-methylphenyl) propane] It is preferable to contain at least one selected from carbonates (sometimes referred to as "predetermined polycarbonate resin").
- predetermined polycarbonate resin As the thermoplastic resin, two or more different types of thermoplastic resins (polycarbonate resin) can be used.
- the molecular weight of the polycarbonate resin contained in the thermoplastic resin is preferably 10,000 to 100,000, more preferably 10,000 to 80,000, and even more preferably 10,000 to 60,000.
- the molecular weight of the polycarbonate resin is high, it is necessary to increase the blending amount of the solvent to obtain a predetermined viscosity.
- the amount of the solvent blended is large, there arises a problem that the film thickness of the coating film becomes thin.
- the molecular weight of the thermoplastic resin (polycarbonate resin) is in the above range, the viscosity, the elongation characteristics during heating, and the electric resistance value of the cured product can be made appropriate in a well-balanced manner.
- polycarbonate resin have high crystallinity. There is a problem that a polycarbonate resin having high crystallinity is crystallized when it is heated and dissolved in a solvent and then returned to room temperature. It is not easy to use such a polycarbonate resin as a resin component of a conductive paste.
- the above-mentioned predetermined polycarbonate resin can be dissolved in a predetermined solvent, for example, a solvent such as isophorone having a high boiling point, and the problem of crystallization after returning to room temperature can be avoided. Therefore, by using the polycarbonate resin as the thermoplastic resin, the possibility of disconnection of the electric wiring can be further reduced.
- the conductive paste contains a polycarbonate resin
- an electric wiring pattern can be easily printed on the surface of a flexible base material made of the polycarbonate resin.
- the weight ratio of (A) conductive particles to (B) thermoplastic resin is 99. It is preferably 1 to 70:30, more preferably 98: 2 to 75:25, and even more preferably 98: 2 to 80:20.
- the conductive composition of the present embodiment may contain other resins such as thermoplastic resins, thermosetting resins and / or photocurable resins as long as the effects are not impaired.
- the resin contained in the conductive composition is preferably a resin made of a thermoplastic resin having a glass transition point of 140 to 200 ° C., and may be made of a polycarbonate resin. More preferred.
- the conductive composition of the present embodiment contains a solvent as the component (C).
- the conductive composition of the present embodiment preferably has a solvent boiling point of 200 ° C. or higher and 300 ° C. or lower.
- the polycarbonate resin can be dissolved by using a solvent having a high boiling point, for example, a solvent such as isophorone.
- a solvent having a high boiling point for example, a solvent such as isophorone.
- the drying time can be set to an appropriate length without shortening the drying time after screen-printing the electric wiring pattern using the conductive paste. .. Therefore, it is possible to more easily deform the electric wiring pattern by following the deformation of the flat sheet or the film at the time of molding. If the boiling point of the solvent exceeds 300 ° C., the solvent may not be sufficiently removed during drying and heating for molding.
- the solvent preferably contains at least one selected from isophorone, 3methoxyN, N dimethylpropanamide, benzyl alcohol, butyl carbitol, ethyl carbitol acetate and tetraglyme.
- the polycarbonate resin can be reliably dissolved by these predetermined solvents. Further, when the conductive paste contains a predetermined solvent, the possibility of disconnection of the obtained electric wiring can be further reduced.
- thermoplastic resins poly (4,4'-cyclohexylidenediphenyl) carbonate and / or copoly [2,2-bis (4-hydroxyphenyl) propane / 2,2-bis (4-hydroxy-3-methyl)
- the above-mentioned solvent can be preferably used. Therefore, the conductive composition can be easily pasted, and the possibility of disconnection of the obtained electrical wiring can be further reduced.
- the solvent preferably contains isophorone.
- isophorone As the solvent, the polycarbonate resin can be more easily dissolved in the solvent. Further, since the boiling point of isophorone is 215 ° C., it can be said that it is the boiling point of a solvent suitable for printing a conductive paste. Further, the conductive paste containing an isophorone solvent has an advantage that it is difficult to gel or solidify even when the conductive paste is left unattended, and solid-liquid separation does not occur during printing. Therefore, the solvent preferably contains isophorone, and more preferably consists of isophorone alone.
- thermoplastic resins poly (4,4'-cyclohexylidenediphenyl) carbonate and / or copoly [2,2-bis (4-hydroxyphenyl) propane / 2,2-bis (4-hydroxy-3-methyl) Phenyl) Propane]
- a solvent containing isophorone can be preferably used.
- the amount of the solvent added is preferably 50 to 1000 parts by weight, more preferably 80 to 900 parts by weight, and further preferably 100 to 800 parts by weight with respect to 100 parts by weight of the thermoplastic resin.
- the thermoplastic resin can be appropriately dissolved by using a solvent having a weight of about four times the weight of the thermoplastic resin.
- the solvent can be appropriately added to the conductive composition in order to adjust the viscosity of the conductive composition.
- the present embodiment is a conductive paste containing the above-mentioned conductive composition.
- the conductive paste of the present embodiment can be a conductive paste containing only the conductive composition containing the above-mentioned (A) conductive particles, (B) thermoplastic resin and (C) solvent.
- the conductive paste of the present embodiment may contain components other than the above-mentioned conductive composition.
- the conductive paste of the present embodiment can further contain at least one selected from the group consisting of inorganic pigments, organic pigments, silane coupling agents, leveling agents, thixotropic agents and defoaming agents.
- the components contained in the above-mentioned conductive composition and other components added in some cases are mixed with a meteor type stirrer, a solver, a bead mill, a Raikai machine, a three-roll mill, and a rotary mill. It can be manufactured by putting it in a mixer such as a type mixer or a twin-screw mixer and mixing it. In this way, a conductive paste suitable for screen printing, immersion, and other desired coating or electrical wiring forming methods can be prepared.
- the viscosity of the conductive paste of this embodiment can be adjusted to a viscosity that can be appropriately used for a predetermined coating film or a method for forming electrical wiring such as screen printing.
- the viscosity can be adjusted by appropriately controlling the amount of the solvent.
- the viscosity of the conductive paste of this embodiment is preferably 10 to 1000 Pa ⁇ sec, more preferably 20 to 700 Pa ⁇ sec, and even more preferably 25 to 600 Pa ⁇ sec.
- This embodiment is an electric circuit containing a cured product of a predetermined conductive paste.
- a paste obtained by printing the conductive paste of the present embodiment so as to form a predetermined pattern and heating and drying at 120 ° C. for 30 minutes is referred to as a “cured product”.
- the cured product can be used as an electric wiring for an electric circuit or the like. Therefore, the conductive paste of the present embodiment can form an electric circuit having a low possibility of disconnection.
- the heating of the conductive paste when producing the cured product does not have to be the final heating.
- a flexible base material for example, a flat sheet or film made of a polycarbonate resin
- an electric circuit pattern for example, a flat sheet or film made of a polycarbonate resin
- the printed conductive paste is dried to obtain flexible electricity.
- a circuit body sometimes called a circuit body.
- the flexible electric circuit body includes a flexible base material and an electric circuit arranged on the flexible base material.
- the conductive paste of this embodiment can be preferably used as a conductive paste for forming a flexible electric circuit body.
- a molded body including a desired electric circuit can be manufactured.
- the temperature and time for drying the electrical wiring pattern of the conductive paste can be appropriately selected depending on the type of the thermoplastic resin contained in the conductive composition.
- the temperature and time for drying the conductive paste can be appropriately adjusted and determined in consideration of the heat resistance of the base material.
- the temperature and time for drying the conductive paste can be 60 ° C. to 160 ° C. for 3 minutes to 60 minutes, preferably 80 ° C. to 150 ° C. for 3 minutes to 60 minutes, and more preferably 100 ° C. to 100 ° C. It can be 3 to 30 minutes at 130 ° C.
- the molded body of the present embodiment By molding the flexible electric circuit body together with another resin (molding resin), the molded body of the present embodiment can be manufactured. That is, the molded body of the present embodiment includes an electric circuit.
- the technique of manufacturing a molded body including an electric circuit is called in-mold electronics. Therefore, the conductive paste of the present embodiment can be preferably used as the conductive paste for in-mold electronics.
- the molded body of this embodiment is preferably molded by heat molding.
- the method for manufacturing a molded body by in-mold electronics of the present embodiment first, an electric circuit is formed on the surface of a flexible base material by using the above-mentioned conductive paste of the present embodiment.
- the molded body can be formed by molding the flexible base material (flexible electric circuit body) on which the electric circuit is formed and the molding resin.
- an example of the manufacturing process of the molded body by in-mold electronics is as follows.
- the conductive paste of the present embodiment is printed on the surface of a flexible base material (for example, a flat sheet or film made of a polycarbonate resin) to form a printing pattern (electric circuit pattern).
- a flexible base material for example, a flat sheet or film made of a polycarbonate resin
- the flexible electric circuit body is manufactured by heating and drying the printing pattern (electric circuit pattern) of the conductive paste printed on the flexible base material.
- the drying conditions can be, for example, a heating temperature of 120 ° C. and a heating time of 30 minutes.
- the flexible electric circuit body that formed the electric circuit in the previous term is made into a three-dimensional shape by molding such as heat molding, pressure molding, or vacuum molding.
- the heating temperature of the flexible electric circuit body is preferably 140 ° C. to 180 ° C.
- the flexible electric circuit body having a three-dimensional shape and the molding resin are integrally molded by molding such as heat molding, pressure molding, or vacuum molding.
- the heating temperature at the time of this integral molding is preferably 140 ° C. to 180 ° C.
- a molded body made of in-mold electronics can be manufactured.
- a molded body having an electric circuit having a low possibility of disconnection can be manufactured by molding.
- Tables 1 and 2 show the compositions of the conductive pastes of Examples 1 to 14 and Comparative Examples 1 and 2.
- the composition shows the weight of the conductive particles as 100 parts by weight.
- the conductive pastes of Examples and Comparative Examples are conductive compositions composed of silver particles (conductive particles), a thermoplastic resin, and a solvent.
- ⁇ (A) Conductive particles> silver particles were used as the conductive particles.
- Table 3 shows the manufacturers and model numbers, particle shapes, average particle diameters (D50), tap (TAP) densities, and specific surface areas of the silver particles A to E (conductive particles A to E) used in Examples and Comparative Examples. show.
- the tap density is the "bulk density" obtained after mechanically tapping a container containing a powder sample.
- Table 4 shows the manufacturers and model numbers of the resins A to F used as the thermoplastic resins in Examples and Comparative Examples, the types of resins, the molecular weights, and the glass transition points.
- Table 5 shows the manufacturers and model numbers of the solvents A to F used in Examples and Comparative Examples, the types of solvents, and the boiling points.
- the thermoplastic resin was mixed with the conductive particles in a state of being dissolved in a solvent.
- As the base material a flat sheet (film) made of polycarbonate resin and having a sheet-like flexibility was used. The size of the base material is 10 cm ⁇ 2 cm, and the thickness is 250 ⁇ m. This substrate can be deformed (stretched) at a temperature of 160 ° C. Wiring patterns (width: 3 mm, length: 50 mm) of the conductive pastes (conductive compositions) of Examples and Comparative Examples were printed on the surface of this base material. The electrical resistance value, which will be described later, was measured by arranging electrodes at both ends in the length direction of 50 mm. A screen printing machine was used for printing. After printing, it was dried by heating in a constant temperature dryer at 120 ° C.
- the film thickness of the obtained cured product of the wiring pattern (simply referred to as “wiring pattern”) was 10 ⁇ m.
- the film thickness was measured using a surface roughness shape measuring machine (model number: Surfcom 1500SD-2) manufactured by Tokyo Seimitsu Co., Ltd.
- the electrical resistance values (initial resistance values) of the wiring patterns of Examples and Comparative Examples were measured by arranging electrodes at both ends in the length direction of 50 mm and energizing them in a state where they were not extended.
- the electrical resistance value of the wiring pattern was measured by the 4-terminal method using a 7461A digital multimeter manufactured by ADC. The specific resistance was calculated from the electrical resistance value and the dimensions of the wiring pattern.
- Tables 1 and 2 show the initial resistivity values calculated from the initial resistance values of Examples and Comparative Examples.
- the wiring pattern is stretched 100% in the longitudinal direction (the length direction of the pattern having a length of 50 mm) at a temperature of 160 ° C. (the length after stretching is 100 mm). It was stretched until it became.
- the resistance values after elongation of Examples and Comparative Examples are shown as values divided by the initial resistance values.
- the wire was broken during the elongation. Therefore, for Comparative Examples 1 and 2, the elongation rate ([extension length-initial length 50 mm] / initial length 50 mm) when the wire is broken is shown.
- the conductive pastes of Examples 1 to 14 include a thermoplastic resin (polycarbonate resin of resins A to D) having a glass transition point of 140 to 200 ° C. as the thermoplastic resin. Therefore, the wiring patterns of Examples 1 to 14 did not break at 100% extension, and the rate of change in resistance value at 100% extension with respect to the initial resistance was 54 times or less. In the case of Examples 1 to 4 and 6 to 14 in which only the thermoplastic resin (polycarbonate resin of resins A to D) having a glass transition point of 140 to 200 ° C. was used, the resistance at 100% elongation with respect to the initial resistance. The rate of change in value was 47 times or less.
- the conductive pastes of Comparative Examples 1 and 2 include thermoplastic resins (resins E and F) having a glass transition point of 98 ° C. or lower as the (B) thermoplastic resin. Comparative Example 1 was broken when the wiring pattern was extended by 13%, and Comparative Example 2 was broken when the wiring pattern was extended by 80%.
Abstract
Description
本実施形態の構成1は、(A)導電性粒子と、(B)熱可塑性樹脂と、(C)溶剤とを含み、前記(B)熱可塑性樹脂のガラス転移点が140~200℃である導電性組成物である。
本実施形態の構成2は、前記(B)熱可塑性樹脂がポリカーボネート樹脂を含む、構成1の導電性組成物である。
本実施形態の構成3は、前記(B)熱可塑性樹脂が、ポリ(4,4’-シクロヘキシリデンジフェニル)カーボネート及びコポリ[2,2-ビス(4-ヒドロキシフェニル)プロパン/2,2-ビス(4-ヒドロキシ-3-メチルフェニル)プロパン]カーボネートから選択される少なくとも1つを含む、構成1又は2の導電性組成物である。
本実施形態の構成4は、前記(C)溶剤の沸点が200℃以上である、構成1~3のいずれかの導電性組成物である。
本実施形態の構成5は、前記(C)溶剤が、イソホロン、3メトキシN,Nジメチルプロパンアミド、ベンジルアルコール、ブチルカルビトール、エチルカルビトールアセテート及びテトラグライムから選択される少なくとも1つを含む、構成1~4のいずれかの導電性組成物である。
本実施形態の構成6は、前記(A)導電性粒子と、前記(B)熱可塑性樹脂との重量比((A)導電性粒子の重量:(B)熱可塑性樹脂の重量)が、99:1~70:30である、構成1~5のいずれかの導電性組成物である。
本実施形態の構成7は、前記(A)導電性粒子が銀粒子である、構成1~6のいずれかの導電性組成物である。
本実施形態の構成8は、構成1~7のいずれかの導電性組成物を含む導電性ペーストである。
本実施形態の構成9は、構成8の導電性ペーストであって、可撓性電気回路体形成用の導電性ペーストである。
本実施形態の構成10は、構成8の導電性ペーストであって、インモールドエレクトロニクス用の導電性ペーストである。
本実施形態の構成11は、構成8~10のいずれかの導電性ペーストの硬化物を含む電気回路である。
本発明の構成12は、可撓性基材と、可撓性基材上に配置された構成11の電気回路とを含む、可撓性電気回路体である。
本発明の構成13は、構成8~10のいずれかの導電性ペーストを用いて、可撓性基材の表面に電気回路を形成することと、前期電気回路を形成した前記可撓性基材と、成型用樹脂とを成型することにより、成型体を形成することとを含む、成型体の製造方法である。
本実施形態の導電性組成物は、(A)成分として導電性粒子を含む。
本実施形態の導電性組成物は、(B)成分として熱可塑性樹脂を含む。
本実施形態の導電性組成物は、(C)成分として溶剤を含む。
本実施形態は、上述の導電性組成物を含む導電性ペーストである。
可撓性電気回路体を、他の樹脂(成型用樹脂)と共に成型することにより、本実施形態の成型体を製造することができる。すなわち、本実施形態の成型体は、電気回路を含む。なお、電気回路を含む成型体を製造する技術は、インモールドエレクトロニクスと呼ばれている。したがって、本実施形態の導電性ペーストは、インモールドエレクトロニクス用の導電性ペーストとして、好ましく用いることができる。
表1及び表2に、実施例1~14及び比較例1及び2の導電性ペーストの組成を示す。組成は、導電性粒子の重量を100重量部として示す。実施例及び比較例の導電性ペーストは、銀粒子(導電性粒子)、熱可塑性樹脂及び溶剤からなる導電性組成物である。
実施例及び比較例では、導電性粒子として銀粒子を用いた。表3に、実施例及び比較例に用いた銀粒子A~E(導電性粒子A~E)の製造会社及び型番、粒子形状、平均粒子径(D50)、タップ(TAP)密度並びに比表面積を示す。タップ密度とは、粉体試料を入れた容器を機械的にタップした後に得られる「かさ密度」である。
表4に、熱可塑性樹脂として実施例及び比較例に用いた樹脂A~Fの製造会社及び型番、樹脂の種類、分子量並びにガラス転移点を示す。
表5に、実施例及び比較例に用いた溶剤A~Fの製造会社及び型番、溶剤の種類及び沸点を示す。なお、熱可塑性樹脂は、溶剤に溶解した状態で、導電性粒子と混合した。
次に、上述の所定の調製割合の材料を、プラネタリーミキサーで混合し、更に三本ロールミルで分散し、ペースト化することによって導電性ペーストを調製した。
実施例及び比較例の導電性ペーストの粘度は、測定温度25℃で、ブルックフィールド社製(B型)粘度計により、SC4-14スピンドル(ユーティリティカップアンドスピンドル(UC/S)=#14)を用いて、回転数10rpmの条件で測定した。測定結果を表1及び2に示す。
基材として、材質はポリカーボネート樹脂製のシート状の可撓性を有する平面シート(フィルム)を用いた。基材の大きさは10cm×2cmであり、厚さは250μmである。この基材は、160℃の温度で変形(伸長)可能である。この基材の表面に、実施例及び比較例の導電性ペースト(導電性組成物)の配線パターン(幅:3mm、長さ:50mm)を印刷した。なお、後述する電気抵抗値の測定は、長さ方向50mmの両端に電極を配置して行った。印刷には、スクリーン印刷機を用いた。印刷後、定温乾燥機で、120℃で30分間、加熱乾燥させた。得られた配線パターンの硬化物(単に「配線パターン」という。)の膜厚は、10μmだった。なお、膜厚は、(株)東京精密製表面粗さ形状測定機(型番:サーフコム1500SD-2)を用いて測定した。
実施例1~14の導電性ペーストは、熱可塑性樹脂として、ガラス転移点が140~200℃である熱可塑性樹脂(樹脂A~Dのポリカーボネート樹脂)を含む。そのため、実施例1~14の配線パターンは、100%伸長時には断線せず、初期抵抗に対する100%伸長時の抵抗値変化率は、54倍以下だった。なお、ガラス転移点が140~200℃である熱可塑性樹脂(樹脂A~Dのポリカーボネート樹脂)のみ使用した実施例1~4及び6~14の場合には、初期抵抗に対する100%伸長時の抵抗値変化率は、47倍以下だった。
Claims (13)
- (A)導電性粒子と、
(B)熱可塑性樹脂と、
(C)溶剤と
を含み、
前記(B)熱可塑性樹脂のガラス転移点が140~200℃である導電性組成物。 - 前記(B)熱可塑性樹脂がポリカーボネート樹脂を含む、請求項1に記載の導電性組成物。
- 前記(B)熱可塑性樹脂がポリ(4,4’-シクロヘキシリデンジフェニル)カーボネート及びコポリ[2,2-ビス(4-ヒドロキシフェニル)プロパン/2,2-ビス(4-ヒドロキシ-3-メチルフェニル)プロパン]カーボネートから選択される少なくとも1つを含む、請求項1又は2に記載の導電性組成物。
- 前記(C)溶剤の沸点が200℃以上である、請求項1~3のいずれか1項に記載の導電性組成物。
- 前記(C)溶剤が、イソホロン、3メトキシN,Nジメチルプロパンアミド、ベンジルアルコール、ブチルカルビトール、エチルカルビトールアセテート及びテトラグライムから選択される少なくとも1つを含む、請求項1~4のいずれか1項に記載の導電性組成物。
- 前記(A)導電性粒子と、前記(B)熱可塑性樹脂との重量比((A)導電性粒子の重量:(B)熱可塑性樹脂の重量)が、99:1~70:30である、請求項1~5のいずれか1項に記載の導電性組成物。
- 前記(A)導電性粒子が銀粒子である、請求項1~6のいずれか1項に記載の導電性組成物。
- 請求項1~7のいずれか1項に記載の導電性組成物を含む導電性ペースト。
- 請求項8に記載の導電性ペーストであって、可撓性電気回路体形成用の導電性ペースト。
- 請求項8に記載の導電性ペーストであって、インモールドエレクトロニクス用の導電性ペースト。
- 請求項8~10のいずれか1項に記載の導電性ペーストの硬化物を含む電気回路。
- 可撓性基材と、
可撓性基材上に配置された請求項11に記載の電気回路と
を含む、可撓性電気回路体。 - 請求項8~10のいずれか1項に記載の導電性ペーストを用いて、可撓性基材の表面に電気回路を形成することと、
前期電気回路を形成した前記可撓性基材と、成型用樹脂とを成型することにより、成型体を形成することと
を含む、成型体の製造方法。
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- 2022-01-07 WO PCT/JP2022/000294 patent/WO2022153925A1/ja active Application Filing
- 2022-01-07 TW TW111100771A patent/TW202235534A/zh unknown
- 2022-01-07 EP EP22739334.5A patent/EP4279549A1/en active Pending
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TW202235534A (zh) | 2022-09-16 |
JPWO2022153925A1 (ja) | 2022-07-21 |
EP4279549A1 (en) | 2023-11-22 |
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