WO2011045855A1 - レーザー接着用ゴム部材、及びシューズ - Google Patents
レーザー接着用ゴム部材、及びシューズ Download PDFInfo
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- WO2011045855A1 WO2011045855A1 PCT/JP2009/067831 JP2009067831W WO2011045855A1 WO 2011045855 A1 WO2011045855 A1 WO 2011045855A1 JP 2009067831 W JP2009067831 W JP 2009067831W WO 2011045855 A1 WO2011045855 A1 WO 2011045855A1
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- silica
- parts
- mass
- rubber
- rubber member
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/12—Soles with several layers of different materials
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/04—Plastics, rubber or vulcanised fibre
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
- A43D25/00—Devices for gluing shoe parts
- A43D25/06—Devices for gluing soles on shoe bottoms
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
- A43D86/00—Machines for assembling soles or heels onto uppers, not provided for in groups A43D25/00 - A43D83/00, e.g. by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
- B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
- B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1629—Laser beams characterised by the way of heating the interface
- B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1677—Laser beams making use of an absorber or impact modifier
- B29C65/168—Laser beams making use of an absorber or impact modifier placed at the interface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
- B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/45—Joining of substantially the whole surface of the articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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- 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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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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
- C09J121/00—Adhesives based on unspecified rubbers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1629—Laser beams characterised by the way of heating the interface
- B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1629—Laser beams characterised by the way of heating the interface
- B29C65/1674—Laser beams characterised by the way of heating the interface making use of laser diodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
- B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
- B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
- B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
- B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
- B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2509/00—Use of inorganic materials not provided for in groups B29K2503/00 - B29K2507/00, as filler
- B29K2509/08—Glass
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/50—Footwear, e.g. shoes or parts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
Definitions
- the present invention relates to a rubber member for laser bonding excellent in laser light permeability and a shoe having this rubber member.
- the shoes are manufactured by bonding respective components such as an outer sole and a midsole.
- the bonding between the constituent members is performed using a solvent-type adhesive or a hot-melt adhesive.
- the bonding method using a solvent-type adhesive takes time because it requires an adhesive application step and a solvent volatilization step.
- the constituent members of shoes may have a complicated shape on the bonding surface.
- a solvent-type adhesive cannot be applied to an adhesive surface having such a complicated shape by using a machine, and the application must be relied on manually. For this reason, the adhesion spot between members resulting from human error is easy to occur.
- the bonding method using a hot-melt adhesive is environmentally preferable because the solvent does not volatilize.
- hot melt adhesives are generally difficult to apply because of their high viscosity. In particular, it is difficult to uniformly apply a hot melt adhesive to an adhesive surface having a complicated shape.
- an adhesion method using laser light is known.
- the laser bonding method does not have a problem like the bonding method using the solvent type adhesive or the hot melt type adhesive. For this reason, it is conceivable to apply a bonding method using a laser beam when manufacturing shoes.
- the bonding method using laser light two adherends are laminated, or two adherends are laminated with a melt-adhesive sheet interposed therebetween, and the laminate is irradiated with laser light to form two adherends.
- This is a method of bonding the interface of the adherend.
- one adherend is formed from a material that can transmit laser light
- the other adherend or melt-adhesive sheet is formed from a material that can be melted by absorbing the laser light.
- Patent Document 1 Japanese Patent Application Publication No. 2004-262961
- the transmittance of laser light having a wavelength of 808 nm is 5% or more. More specifically, the laser beam transmittance of a molded body (rubber member) obtained by molding a thermoplastic resin containing the rubber-reinforced resin is 10 to 32% (Table 2 of Patent Document 1). .
- the rubber member disclosed in Patent Document 1 has a problem of poor adhesion or a long bonding time because the laser light transmittance is relatively low.
- the rubber member must have mechanical strength.
- a rubber member used as a constituent member of a shoe must have excellent mechanical strength.
- An object of the present invention is to provide a rubber member for laser bonding and a shoe having this rubber member, which are excellent in laser light transmittance and further have excellent mechanical strength.
- the rubber member in order to adhere the rubber member to the adherend in a short time and satisfactorily using laser light, the rubber member must sufficiently transmit the laser light.
- the first rubber member for laser bonding of the present invention comprises a rubber component and silica, the silica has an average particle size of 5 nm to 50 nm, and the amount of the silica is 100 parts by mass of the rubber component.
- the laser beam transmittance is 30% or more.
- the transmittance of the laser light is the transmittance when the thickness of the rubber member is 2 mm and this is irradiated with laser light having a wavelength of 808 nm.
- the second rubber member for laser bonding of the present invention contains a rubber component and silica, the average particle diameter of the silica is more than 50 nm and 120 nm or less, and the amount of the silica is 100 parts by mass of the rubber component.
- the laser beam transmittance is 30% or more with respect to 10 parts by mass to 50 parts by mass.
- the transmittance of the laser light is the transmittance when the thickness of the rubber member is 2 mm and this is irradiated with laser light having a wavelength of 808 nm.
- the third rubber member for laser bonding of the present invention contains a rubber component and silica, and the silica contains silica having an average particle diameter of more than 50 nm and not more than 120 nm and silica having an average particle diameter of 5 nm to 50 nm,
- the amount of silica having an average particle size of more than 50 nm and not more than 120 nm is 10 to 50 parts by mass with respect to 100 parts by mass of the rubber component, and the amount of silica having the average particle size of 5 to 50 nm is the rubber component.
- the amount is 10 to 50 parts by mass with respect to 100 parts by mass.
- the transmittance of the laser light is the transmittance when the thickness of the rubber member is 2 mm and this is irradiated with laser light having a wavelength of 808 nm.
- the refractive index of the silica is 1.5 or less.
- Another preferable rubber member for laser bonding of the present invention further contains zinc oxide, and the amount of zinc oxide is 3 parts by mass or less with respect to 100 parts by mass of the rubber component.
- a shoe is provided.
- This shoe comprises any of the rubber members for laser bonding described above.
- the rubber member for laser bonding according to the present invention is excellent in laser light transmittance. If this rubber member is used, the irradiation time of the laser beam, which is necessary for adhering the rubber member to the adherend, can be made relatively short. Furthermore, since the rubber member of the present invention is also excellent in mechanical strength, it can be suitably used as, for example, a shoe component.
- the side view of the laminated body containing the rubber member for laser bonding, and a to-be-adhered body. 1 is a side view of one embodiment of a shoe. Sectional drawing cut
- the rubber member for laser bonding of the present invention contains a rubber component and silica.
- the silica is contained in an amount of 10 to 100 parts by mass with respect to 100 parts by mass of the rubber component.
- the silica is contained in an amount of 10 to 50 parts by mass with respect to 100 parts by mass of the rubber component.
- Such a rubber member for laser bonding has a thickness of 2 mm and a transmittance of 30% or more when irradiated with laser light having a wavelength of 808 nm.
- the “laser member for laser bonding” may be referred to as “rubber member”.
- the rubber component is not particularly limited, and examples thereof include diene rubber and non-diene rubber.
- Diene rubbers include synthetic rubbers such as butadiene rubber (BR), isoprene rubber (IR), chloroprene (CR); natural rubber (NR); styrene butadiene rubber (SBR), styrene butadiene styrene rubber (SBSR), and acrylonitrile butadiene.
- BR butadiene rubber
- SBR styrene butadiene rubber
- SBSR styrene butadiene styrene rubber
- acrylonitrile butadiene acrylonitrile butadiene
- NBR styrene isoprene copolymers
- SIR styrene isoprene copolymers
- IIR butyl rubber
- Non-diene rubbers include ethylene / ⁇ -olefin copolymer rubbers containing ethylene units and ⁇ -olefin units having 3 or more carbon atoms; urethane rubbers; acrylic rubbers; silicone rubbers; Is mentioned.
- the copolymer rubber may be a block copolymer or a random copolymer.
- the diene rubber or non-diene rubber can be used alone or in combination of two or more.
- the rubber component of the present invention is preferably a diene rubber, more preferably at least one selected from the group consisting of butadiene rubber, isoprene rubber, styrene butadiene rubber, and natural rubber.
- a rubber member containing such a rubber component is preferable because it is excellent in processability and crosslinking efficiency.
- Silica is a filler for increasing the bulk of the rubber member and reinforcing the rubber.
- silica having an average particle size of 5 nm to 120 nm is used. Specifically, silica having an average particle diameter of 5 nm to 50 nm or / and silica having an average particle diameter of more than 50 nm and 120 nm or less is used.
- silica having an average particle diameter of 5 nm to 50 nm may be referred to as “first silica”
- silica having an average particle diameter of more than 50 nm but not more than 120 nm may be referred to as “second silica”.
- the first silica preferably has an average particle size of 10 nm to 50 nm, and more preferably an average particle size of 10 nm to 30 nm.
- the second silica preferably has an average particle diameter of more than 50 nm and 100 nm or less.
- the average particle diameter of silica can be measured by the method described in the following examples.
- the silica having the average particle diameter can be obtained by a known adjustment method.
- a dry pulverization method for obtaining silica having a target average particle diameter using a jet mill or a ball mill a silica having a target average particle diameter is obtained using a disper or a homogenizer.
- Wet pulverization method and the like.
- the content of silica is appropriately determined according to the average particle diameter.
- the rubber member of the present invention may contain either the first silica or the second silica alone, or may contain both the first silica and the second silica.
- the amount of the first silica is 10 parts by mass to 100 parts by mass, preferably 10 parts by mass to 80 parts by mass, and more preferably 10 parts by mass with respect to 100 parts by mass of the rubber component. Parts by mass to 50 parts by mass. If the content of the first silica is less than 10 parts by mass, a sufficient reinforcing effect cannot be imparted to the rubber member, and a rubber member having poor mechanical strength may be obtained.
- the content of the first silica exceeds 100 parts by mass, a rubber member having a laser light transmittance of 30% or more may not be obtained.
- the amount of the second silica is 10 parts by weight to 50 parts by weight, preferably 10 parts by weight to 30 parts by weight, and more preferably 10 parts by weight with respect to 100 parts by weight of the rubber component. Parts by mass to 20 parts by mass. If the content of the second silica is less than 10 parts by mass, a sufficient reinforcing effect cannot be imparted to the rubber member, and a rubber member having excellent mechanical strength may not be obtained. On the other hand, when the content of the second silica exceeds 50 parts by mass, a rubber member having a laser light transmittance of 30% or more cannot be obtained.
- the amount of the first silica is 10 parts by mass to 50 parts by mass, preferably 10 parts by mass to 30 parts by mass with respect to 100 parts by mass of the rubber component.
- the amount of the second silica is 10 to 50 parts by mass, preferably 10 to 30 parts by mass with respect to 100 parts by mass of the rubber component. It is presumed that the second silica having an average particle size larger than that of the first silica has an effect of preventing the transmission of laser light. However, the addition of the first silica to the second silica has the effect of improving the transmission of the laser light. For this reason, when using 2nd silica, it is preferable to use 1st silica together.
- the rubber member of the present invention preferably contains at least first silica (silica having an average particle diameter of 5 nm to 50 nm).
- the first silica is difficult to reduce the laser beam transmittance of the rubber member. For this reason, the use of the first silica can increase the content of silica as compared with the case where the second silica is used alone. By blending more silica, a rubber member that is bulky and has excellent mechanical strength can be obtained.
- the refractive index of silica is preferably 1.5 or less, more preferably 1.2 to 1.5, and particularly preferably 1.4 to 1.5. Silica having a refractive index exceeding 1.5 may reduce the laser transmittance. On the other hand, silica having a refractive index of less than 1.2 is difficult to obtain in practice.
- the refractive index of the silica can be measured using an Abbe refractometer or the like.
- silica is a dry silica obtained by burning silicon tetrachloride in an oxyhydrogen flame; a wet silica obtained by neutralizing an alkali silicate with an acid; an alkoxide of silicon
- a sol-gel method silica obtained by hydrolysis in an acidic or alkaline water-containing organic solvent; colloidal silica obtained by electrodialysis of an aqueous alkali silicate solution.
- these silica can be used individually by 1 type or in combination of 2 or more types.
- dry silica is preferably used because it hardly aggregates and is excellent in dispersibility during processing.
- the rubber member of the present invention may contain a filler other than the silica.
- fillers other than silica include calcium carbonate, magnesium carbonate, magnesium oxide, and titanium oxide.
- titanium oxide has a property of remarkably reflecting laser light. For this reason, it is preferable that a rubber member does not contain titanium oxide substantially.
- the amount of titanium oxide is preferably more than 0 and 0.1 parts by mass or less with respect to 100 parts by mass of the rubber component.
- the rubber component of this invention does not contain carbon black substantially as a filler. Since carbon black absorbs laser light, the transmittance of the rubber member is extremely reduced. In addition, the blending of carbon black may induce heat generation of the rubber member when irradiated with laser light.
- the rubber member of the present invention preferably contains a crosslinking agent.
- the rubber component is crosslinked by the crosslinking agent, and a rubber member having good rubber elasticity can be obtained.
- the crosslinking agent is not particularly limited, and examples thereof include sulfur-containing compounds and organic peroxides.
- the compound containing sulfur include sulfur, sulfur halide, di-2-benzothiazolyl disulfide, N-oxydiethylene-2-benzothiazolylsulfenamide, and the like.
- the organic peroxide include dicumyl peroxide, 2,5-dimethyl-2.5-di (t-butylperoxy) hexane, 1,1-di (t-butylperoxy) cyclohexane and the like.
- the amount of the crosslinking agent is preferably 0.5 to 10 parts by mass, more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the rubber component.
- the rubber member may contain a crosslinking accelerator.
- the crosslinking accelerator include zinc oxide, metal oxides other than zinc, metal hydroxides, and fatty acids.
- the metal oxide other than zinc include magnesium oxide and lead monoxide.
- the metal hydroxide include calcium hydroxide.
- fatty acids include stearic acid and oleic acid.
- Zinc oxide is preferably used because of its excellent crosslinking promotion effect.
- the amount of zinc oxide is preferably more than 0 and 3 parts by mass or less, more preferably more than 0 and 1 part by mass or less with respect to 100 parts by mass of the rubber component. It is.
- a rubber member containing zinc oxide exceeding 3 parts by mass may have a laser light transmittance of less than 30%.
- the rubber member of the present invention may contain a silane coupling agent.
- the silane coupling agent include an epoxy silane coupling agent, a polysulfide silane coupling agent, and an amino silane coupling agent. Since the adhesion between the adherend and the rubber member can be improved, the rubber member preferably contains an amino silane coupling agent.
- the rubber member may contain other additives as long as the effects of the present invention are not impaired. Examples of other additives include a weather resistance agent, an antioxidant, an ultraviolet absorber, a lubricant, an antistatic agent, and a dispersant.
- the rubber member of the present invention is obtained by kneading the above components and molding the kneaded product.
- the temperature at the time of kneading each component is usually 100 ° C. or lower, preferably 80 ° C. or lower. Kneading at an excessively high temperature may cause cross-linking of the rubber component contained in the kneaded product. Kneading can be performed using a Banbury mixer, a kneader, a twin screw extruder, or the like.
- the kneaded product is formed by placing the kneaded product in a suitable mold and heating. By heating, the rubber component is crosslinked through a crosslinking agent, and a rubber member having rubber elasticity is obtained.
- the molding temperature of the kneaded product is preferably 120 ° C. to 200 ° C., more preferably 120 ° C. to 180 ° C.
- the use of the rubber member of the present invention is not particularly limited, and can be used for any appropriate use. Further, the rubber member of the present invention can be formed in an appropriate planar shape or three-dimensional shape and thickness depending on the application. Since the rubber member of the present invention is excellent in mechanical strength, it can be suitably used as a component member of a product that can be used in harsh environments.
- a preferable use of such a rubber member is a constituent member of shoes. Examples of the constituent members of the shoes include an outer sole, a midsole, an insole, a heel counter, and the like, and preferably an outer sole.
- the outer sole is a component that normally contacts the ground, but includes an element that is disposed on a portion that does not contact the ground (arch portion).
- FIG. 1 shows a laminate 5 in which a rubber member 1, a melt adhesive sheet 2 and an adherend 3 of the present invention are stacked in this order.
- the layers 1, 2, 3 of the laminate 5 are bonded. That is, the melt-bonded sheet 2 is heated and melted by laser light, and the rubber member 1 and the adherend 3 are firmly bonded through the melted sheet 2.
- a shoe 10 is, for example, a sports shoe.
- the shoe 10 includes a main body 11 that covers an instep or the like, a midsole 12 provided below the main body 11, and an outer sole 13 provided below the midsole 12.
- An adhesive layer 14 is provided between the midsole 12 and the outer sole 13.
- the midsole 12 and the outer sole 13 are bonded via an adhesive layer 14.
- the midsole 12 is formed using the adherend 3
- the outer sole 13 is formed using the rubber member 1, and the melt bonding sheet 2 is used for bonding.
- Layer 14 is formed.
- the melt-bonded sheet is a material that can be melted by laser light, and is formed from a material that can be bonded to both the rubber member and the adherend.
- the material for forming the melt-adhesive sheet include a composition containing a polymer material and an absorbent.
- the said absorber means the agent which can improve a laser absorptivity by adding it.
- the polymer material include polymer materials (for example, thermoplastic resins, thermoplastic elastomers, and rubbers) that are used as main components such as hot-melt adhesives.
- thermoplastic resin examples include olefin resins such as low density polyethylene, high density polyethylene, polypropylene, ethylene-vinyl acetate copolymer (EVA), and ethylene- ⁇ olefin copolymer; polyethylene terephthalate, polybutylene terephthalate, and the like.
- Ester resins such as polystyrene, AS resins, ABS resins, styrene resins such as 6-nylon, amide resins such as nylon, vinyl chloride resins, acrylic resins such as polymethyl methacrylate, and vinyl acetate resins. It is done. These can be used individually by 1 type or in mixture of 2 or more types.
- thermoplastic elastomer examples include olefin elastomers, styrene elastomers, urethane elastomers, ester elastomers, fluorine elastomers, silicone elastomers, polyamide elastomers, and the like. These can be used individually by 1 type or in mixture of 2 or more types. Specific examples of the rubber are as exemplified in the rubber component, so refer to it.
- the molten adhesive sheet preferably has excellent flexibility even after the rubber member and the adherend are bonded. Such a melt-bonded sheet can be formed by using an olefin resin or an olefin elastomer.
- the absorbent examples include inorganic pigments such as carbon black and oxide pigments; organic pigments such as phthalocyanine pigments, lake pigments, and polycyclic pigments; and dyes having an absorption wavelength corresponding to the laser beam used. And so on.
- the blending amount of the absorbent is not particularly limited, but is usually 0.1% by mass to 3% by mass in the total amount of the molten adhesive sheet.
- the thickness of the molten adhesive sheet is not particularly limited. However, if the thickness of the molten adhesive sheet is too thin, the rubber member and the adherend may not be sufficiently bonded via the molten adhesive sheet. From such a viewpoint, the thickness of the melt-bonded sheet is preferably 10 ⁇ m or more.
- the material for forming the adherend examples include known thermoplastic resins, thermoplastic elastomers, and rubbers. Specific examples of the thermoplastic resin, the thermoplastic elastomer, and the rubber are the same as those in the column of the above-mentioned melt-bonded sheet and rubber member, so refer to them.
- the main component of the adherend is preferably the same or the same type as the main component of the melt-adhesive sheet. If both main components (for example, polymer materials) are the same or the same kind, the adherend and the melt-adhesive sheet can be firmly bonded. As the adherend, an unfoamed one is usually used, but a foamed adherend can be used if necessary.
- the melt-adhesive sheet can be omitted.
- the adherend is a midsole.
- the wavelength of the irradiated laser beam is 780 nm to 1000 nm.
- laser light having a wavelength of 808 nm is used.
- the laser beam irradiation speed is preferably 3 mm / sec to 15 mm / sec.
- the laser light output is preferably 100 W to 625 W as a whole, using 4 to 25 diodes of 10 W to 25 W per one.
- the rubber member of the present invention has a laser beam transmittance of 30% or more, preferably 50% or more.
- the rubber member of the present invention is excellent in the transmittance of laser light, more laser light passes through the rubber member. For this reason, more laser light reaches a fusion
- the fact that more laser light reaches the molten adhesive sheet or the adherend enables the rubber member and the adherend to be favorably bonded.
- the use of a rubber member having excellent laser light transmittance can shorten the laser light irradiation time for obtaining a desired adhesive strength. Therefore, the efficiency of the bonding operation is improved.
- Silica 2 wet silica having an average particle diameter of 16 nm and a refractive index of 1.45 (manufactured by Degussa, product name “Ultrasil VN3 XR”).
- Silica 3 Dry silica having an average particle diameter of 100 nm and a refractive index of 1.43 (product name “Seahoster KE-P10” manufactured by Nippon Shokubai Co., Ltd.).
- Silica 4 Dry silica having an average particle size of 500 nm and a refractive index of 1.43 (product name “Seahoster KE-P50” manufactured by Nippon Shokubai Co., Ltd.).
- Silica 5 Dry silica having an average particle diameter of 1000 nm and a refractive index of 1.43 (product name “Seahoster KE-P100” manufactured by Nippon Shokubai Co., Ltd.).
- Silica 6 Dry silica having an average particle diameter of 1500 nm and a refractive index of 1.43 (product name “Seahoster KE-P150” manufactured by Nippon Shokubai Co., Ltd.).
- Crosslinking agent dicumyl peroxide.
- Zinc oxide Zinc oxide having an average particle size of 400 to 700 and a refractive index of 1.95 (manufactured by Shodo Chemical Industry Co., Ltd., product name “No. 1 Zinc Hana”).
- Softener Process oil (manufactured by Japan Energy, product name “Process Oil P-200”).
- the average particle size of silica and zinc oxide was measured using a laser diffraction particle size distribution analyzer (product name “SK Laser Micron Sizer LMS-2000e” manufactured by Seishin Enterprise Co., Ltd.).
- the average particle diameter is an average value of three samples.
- Hardness was measured by the following method based on JIS K 6253. Using a spring type hardness tester A type, a test piece having a thickness of 12 mm or more (stacking a plurality of test pieces to be 12 mm or more) so that the push needle of the test machine is perpendicular to the test piece measurement surface The pressure surface of the testing machine was brought into contact with the test piece, and the scale was read immediately after pressing the push needle against the test piece with a load of 9.81 N.
- the tensile strength was measured by the following method based on JIS K 6251. Using a tensile tester (manufactured by Toyo Seiki Seisakusho Co., Ltd., product name “STROGRAPH-R2”), both ends of a dumbbell-shaped No. 2 test piece designated by JIS K 6251 are gripped by the chuck of the tester, and the thickness is 500 mm / min. Pulling was continued until the test piece broke at a speed. And the tensile strength was computed from the cross-sectional area of the narrow part before pulling and the load at the time of fracture
- STROGRAPH-R2 tensile tester
- the elongation was measured by the following method based on JIS K 6251.
- a tensile tester manufactured by Toyo Seiki Seisakusho Co., Ltd., product name “STROGRAPH-R2”
- STROGRAPH-R2 tensile tester
- Both ends of the test piece were gripped with a chuck of a testing machine, and continued to be pulled at a speed of 500 mm / min until the test piece was broken.
- elongation was computed from the distance between marked lines when it broke and the distance (20 mm) between marked lines before pulling.
- the tear strength was measured by the following method based on JIS K6252. Using a tensile tester (manufactured by Toyo Seiki Seisakusho Co., Ltd., product name “STROGRAPH-R2”), both ends of the angle-shaped test piece designated by JIS K 6252 are gripped by the chuck of the tester, and the speed is 500 mm / min. Pulling was continued until the test piece broke. And tear strength was computed from the load at the time of fracture
- STROGRAPH-R2 tensile tester
- Example 1 Each material was blended at a ratio shown in the composition of Table 1, and these were kneaded at 80 ° C. using a kneader (DSS-10MWB-E type) to obtain a kneaded product. Next, this kneaded material was pressed at 160 ° C. and a pressure of about 14.7 MPa for about 20 minutes using a press machine to produce a sheet having a thickness of 2 mm. This sheet was formed to have a vertical length of 50 mm and a horizontal length of 20 mm. The laser beam transmittance of this sheet was measured. The results are shown in Table 1. In the composition of Table 1, the unit of the blending amount of each material is part by mass (the same applies to Tables 2 to 4 and 6).
- Examples 2 to 15 A sheet having a thickness of 2 mm was prepared in the same manner as in Example 1 except that the materials were blended in the ratios shown in Tables 1 to 3. The transmittance of the laser beam of each sheet was measured. The results are shown in each table.
- silica having an average particle diameter of more than 50 nm and 120 nm or less when silica having an average particle diameter of more than 50 nm and 120 nm or less is used, if the amount of silica is 50 parts by mass or less with respect to 100 parts by mass of the rubber component, the laser beam transmittance is 30% or more. It is estimated that a rubber member can be obtained.
- Example 16 to 20 A sheet having a thickness of 2 mm was prepared in the same manner as in Example 1 except that each material was blended in the ratio shown in Table 4. The transmittance of the laser beam of each sheet was measured. The results are shown in Table 4.
- Example 21 and Reference Examples 1 and 2 A sheet having a thickness of 2 mm was prepared in the same manner as in Example 1 except that each material was blended in the ratio shown in Table 6. The transmittance of the laser beam of each sheet was measured. The results are shown in Table 6.
- (Melting adhesive sheet) 50 parts by mass of ethylene-vinyl acetate copolymer (manufactured by Tosoh Corporation, product name “Ultrasen 631”, vinyl acetate amount 20%) and 50 parts by mass of syndiotactic 1,2-polybutadiene (JSR Corporation) Product name “RB830”, 1, 2 bond content: 93%, MFR: 3, melting point: 105 ° C., specific gravity: 0.91) and 0.1 part by mass of infrared absorbing dye (BASF Japan Ltd.) And a product name “Lumogen IR788”) were kneaded with a twin-screw kneader and extruded into a sheet. This sheet was used as a melt adhesive sheet. The sheet had a thickness of 200 ⁇ m, a vertical length of 50 mm, and a horizontal length of 20 mm.
- This foam had a thickness of 4 mm, a vertical length of 50 mm, and a horizontal length of 20 mm.
- Example 21 a laminate was prepared in the same manner, laser bonded, and peel strength was measured. The results are shown in Table 7.
- the rubber member for laser bonding of the present invention can be used for products having a rubber part, for example, shoes and sports equipment.
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Abstract
Description
従来、前記各構成部材間の接着は、溶剤型接着剤又はホットメルト型接着剤を用いて実施されている。
しかしながら、溶剤型接着剤を使用した接着方法は、接着剤の塗布工程や溶剤の揮発工程を要するので、時間がかかる。さらに、シューズの構成部材は、接着面が複雑な形状を有する場合がある。このような複雑な形状を有する接着面に対しては、機械を用いて溶剤型接着剤を塗布できず、その塗布は手作業に頼らざるを得ない。このため、人為的ミスに起因する、部材間の接着斑が生じやすい。
ホットメルト型接着剤を使用した接着方法は、溶剤が揮発しないので環境上好ましい。しかしながら、ホットメルト型接着剤は、一般に粘度が高いので、塗布し難い。特に、複雑な形状を有する接着面に対して、ホットメルト型接着剤を均一に塗布することは困難である。
レーザー光を用いた接着方法は、2つの被着体を積層し、又は溶融接着シートを介在させた状態で2つの被着体を積層し、この積層体にレーザー光を照射して2つの被着体の界面を接着させる方法である。この場合、一方の被着体は、レーザー光を透過し得る材料から形成され、他方の被着体又は溶融接着シートは、レーザー光を吸収することによって溶融し得る材料から形成される。
しかしながら、特許文献1のゴム部材においては、レーザー光の透過率が比較的低いため、接着不良を生じたり、或いは、接着時間が長くなるという問題点がある。
また、ゴム部材は、機械的強度を有していなければならない。特に、シューズの構成部材として使用されるゴム部材は、優れた機械的強度を有していなければならない。
一方、機械的強度に優れたゴム部材を得るためには、充填剤としてシリカを配合することが好ましい。本発明者らは、所定の平均粒子径を有するシリカがレーザー光の透過を妨げる要因になることを見出すことにより、本発明を完成した。
本発明の好ましいレーザー接着用ゴム部材は、前記シリカの屈折率が1.5以下である。
本発明の他の好ましいレーザー接着用ゴム部材は、さらに、酸化亜鉛を含み、この酸化亜鉛の量が、前記ゴム成分100質量部に対して、3質量部以下である。
このシューズは、上記いずれかのレーザー接着用ゴム部材を具備する。
前記シリカの平均粒子径が5nm~50nmである場合、このシリカは、前記ゴム成分100質量部に対して、10質量部~100質量部含まれる。前記シリカの平均粒子径が50nmを超え120nm以下である場合、このシリカは、前記ゴム成分100質量部に対して、10質量部~50質量部含まれる。かかるレーザー接着用ゴム部材は、その厚みを2mmとし且つそれに波長808nmのレーザー光を照射したときの透過率が、30%以上である。
以下、「レーザー接着用ゴム部材」を、「ゴム部材」と記す場合がある。
ジエン系ゴムとしては、ブタジエンゴム(BR)、イソプレンゴム(IR)、クロロプレン(CR)などの合成ゴム;天然ゴム(NR);スチレンブタジエンゴム(SBR)、スチレンブタジエンスチレンゴム(SBSR)、アクリロニトリルブタジエンゴム(NBR)、スチレンイソプレン共重合体(SIR)、ブチルゴム(IIR)などの共重合体ゴム;などが挙げられる。
また、非ジエン系ゴムとしては、エチレン単位と炭素数3以上のα-オレフィンからなる単位とを含むエチレン・α-オレフィン系共重合体ゴム;ウレタン系ゴム;アクリル系ゴム;シリコーン系ゴム;などが挙げられる。
なお、前記共重合体ゴムは、ブロック共重合体でもよいし、或いは、ランダム共重合体でもよい。
前記ジエン系ゴム又は非ジエン系ゴムは、1種単独で、或いは、2種以上を組み合わせて用いることができる。
本発明においては、平均粒子径が5nm~120nmのシリカが用いられる。具体的には、平均粒子径が5nm~50nmのシリカ、又は/及び、平均粒子径が50nmを超え120nm以下のシリカが用いられる。以下、本明細書において、「平均粒子径が5nm~50nmのシリカ」を「第1シリカ」、「平均粒子径が50nmを超え120nm以下のシリカ」を「第2シリカ」と記す場合がある。
前記第1シリカは、その平均粒子径が10nm~50nmであることが好ましく、さらに、平均粒子径が10nm~30nmであることがより好ましい。
前記第2シリカは、その平均粒子径が50nmを超え100nm以下であることが好ましい。
ただし、シリカの平均粒子径は、下記実施例に記載の方法によって測定できる。
本発明のゴム部材は、上記第1シリカ又は第2シリカの何れか一方を単独で含んでいてもよいし、第1シリカ及び第2シリカの双方を含んでいてもよい。
第1シリカを単独で用いる場合、その第1シリカの量は、ゴム成分100質量部に対して、10質量部~100質量部であり、好ましくは10質量部~80質量部、より好ましくは10質量部~50質量部である。前記第1シリカの含有量が10質量部未満であると、ゴム部材に十分な補強効果を付与できず、機械的強度に劣るゴム部材が得られるおそれがある。一方、前記第1シリカの含有量が100質量部を超えると、レーザー光の透過率が30%以上であるゴム部材が得られないおそれがある。
第1シリカに比して平均粒子径が大きい第2シリカは、レーザー光の透過を妨げる作用があると推定される。しかしながら、第2シリカに第1シリカを加えると、レーザー光の透過を向上させる作用がある。このため、第2シリカを用いる場合には、第1シリカを併用することが好ましい。
なお、前記シリカの屈折率は、アッベ屈折計などを用いて測定できる。
また、本発明のゴム成分は、充填剤としてカーボンブラックを実質的に含まないことが好ましい。カーボンブラックは、レーザー光を吸収するので、ゴム部材の透過率を極度に低下させる。また、カーボンブラックの配合は、レーザー光の照射時にゴム部材の発熱を誘発するおそれがある。
架橋剤としては、特に限定されず、硫黄を含む化合物、有機過酸化物などが挙げられる。硫黄を含む化合物としては、硫黄、ハロゲン化硫黄、ジ-2-ベンゾチアゾリルジスルフィド、N-オキシジエチレン-2-ベンゾチアゾリルスルフェンアミドなどが挙げられる。有機過酸化物としては、ジクミルパーオキサイド、2,5-ジメチル-2.5-ジ(t-ブチルペルオキシ)ヘキサン、1,1-ジ(t-ブチルペルオキシ)シクロヘキサンなどが挙げられる。
ただし、架橋促進剤として酸化亜鉛を用いる場合、その酸化亜鉛の量は、ゴム成分100質量部に対して、好ましくは0を超え3質量部以下であり、より好ましくは0を超え1質量部以下である。3質量部を超える酸化亜鉛が配合されたゴム部材は、レーザー光の透過率が30%未満となるおそれがある。
なお、ゴム部材は、本発明の効果を損ねない範囲で、他の添加剤を含んでいてもよい。他の添加剤としては、耐候性剤、酸化防止剤、紫外線吸収剤、滑剤、静電防止剤、分散剤などが挙げられる。
混練物の成形は、適宜の金型内に混練物を入れ、加熱することにより行われる。加熱により、ゴム成分が架橋剤を介して架橋し、ゴム弾性を有するゴム部材が得られる。
上記混練物の成形温度は、好ましくは120℃~200℃であり、より好ましくは120℃~180℃である。
本発明のゴム部材は、機械的強度に優れているため、過酷な環境下で使用され得る商品の構成部材として好適に使用できる。かかるゴム部材の好ましい用途は、シューズの構成部材である。シューズの構成部材としては、アウターソール、ミッドソール、中敷き、ヒールカウンターなどが挙げられ、好ましくはアウターソールである。アウターソールは、通常、地面に接する構成部材であるが、地面に接しない部分(土踏まず部分)に配置されるものも含む。
図1は、本発明のゴム部材1と溶融接着シート2と被着体3とが、この順で重ねられた積層体5を示す。
ゴム部材1側からレーザー光を照射することにより、前記積層体5の各層1,2,3が接着される。すなわち、溶融接着シート2がレーザー光によって発熱溶融し、溶融したシート2を介して、ゴム部材1と被着体3が強固に接着される。
図2及び図3において、シューズ10は、例えば、スポーツシューズである。シューズ10は、足の甲などを覆う本体11と、本体11の下方に設けられたミッドソール12と、ミッドソール12の下方に設けられたアウターソール13と、を有する。ミッドソール12とアウターソール13の間には、接着層14が設けられている。ミッドソール12とアウターソール13は、接着層14を介して接着されている。
図2及び図3に示したシューズにおいては、上記被着体3を用いてミッドソール12が形成され、上記ゴム部材1を用いてアウターソール13が形成され、上記溶融接着シート2を用いて接着層14が形成されている。
前記高分子材料としては、ホットメルト型接着剤などの主成分として使用されている高分子材料(例えば、熱可塑性樹脂、熱可塑性エラストマー、ゴムなど)が挙げられる。前記熱可塑性樹脂としては、例えば、低密度ポリエチレン、高密度ポリエチレン、ポリプロピレン、エチレン-酢酸ビニル共重合体(EVA)、エチレン-αオレフィン共重合体などのオレフィン系樹脂;ポリエチレンテレフタレート、ポリブチレンテレフタレートなどのエステル系樹脂;ポリスチレン、AS樹脂、ABS樹脂などのスチレン系樹脂;6-ナイロンなどのアミド系樹脂;塩化ビニル系樹脂;ポリメタクリル酸メチルなどのアクリル系樹脂;酢酸ビニル系樹脂;などが挙げられる。これらは、1種単独で、又は2種以上を混合して用いることができる。
前記熱可塑性エラストマーとしては、例えば、オレフィン系エラストマー、スチレン系エラストマー、ウレタン系エラストマー、エステル系エラストマー、フッ素系エラストマー、シリコーン系エラストマー、ポリアミド系エラストマーなどが挙げられる。これらは、1種単独で、又は2種以上を混合して用いることができる。
ゴムの具体例は、ゴム成分に例示の通りであるので、それを参照されたい。
溶融接着シートは、上記ゴム部材と被着体を接着した後においても、優れた柔軟性を有することが好ましい。このような溶融接着シートは、オレフィン系樹脂又はオレフィン系エラストマーを用いることによって形成できる。
前記吸収剤としては、例えば、カーボンブラック、酸化物系顔料などの無機顔料;フタロシアニン系顔料、レーキ顔料、多環式系顔料などの有機顔料;使用されるレーザー光に応じた吸収波長を有する染料;などが挙げられる。吸収剤の配合量は、特に限定されないが、通常、溶融接着シートの全量中、0.1質量%~3質量%である。
溶融接着シートの厚みは、特に限定されない。もっとも、溶融接着シートの厚みが余りに薄いと、溶融接着シートを介して上記ゴム部材と被着体を十分に接着できないおそれがある。このような観点から、溶融接着シートの厚みは、好ましくは10μm以上である。
被着体の主成分は、上記溶融接着シートの主成分と同一、又は同種であることが好ましい。両者の主成分(例えば、高分子材料)が同一又は同種であれば、被着体と溶融接着シートが強固に接着し得る。
被着体は、通常、発泡されていないものが用いられるが、必要に応じて、発泡されていている被着体を用いることもできる。
また、レーザー光の透過率に優れたゴム部材を使用は、所望の接着強度を得るための、レーザー光の照射時間を短くできる。従って、接着作業の効率性が高められる。
(1)ブタジエンゴム:日本ゼオン(株)製、製品名「Nipol BR1220」。分子量約43万。
(2)スチレンブタジエンゴム:旭化成(株)製、製品名「アサプレン303」。分子量約17万。
(3)イソプレンゴム:日本ゼオン(株)製、製品名「Nipol IR2200」。分子量約175万。
(4)シリカ1:平均粒子径12nm、屈折率1.45の乾式シリカ(日本アエロジル(株)製、製品名「アエロジル200V」)。
(5)シリカ2:平均粒子径16nm、屈折率1.45の湿式シリカ(デグサ社製、製品名「ウルトラジルVN3 XR」)。
(6)シリカ3:平均粒子径100nm、屈折率1.43の乾式シリカ((株)日本触媒製、製品名「シーホスターKE-P10」)。
(7)シリカ4:平均粒子径500nm、屈折率1.43の乾式シリカ((株)日本触媒製、製品名「シーホスターKE-P50」)。
(8)シリカ5:平均粒子径1000nm、屈折率1.43の乾式シリカ((株)日本触媒製、製品名「シーホスターKE-P100」)。
(9)シリカ6:平均粒子径1500nm、屈折率1.43の乾式シリカ((株)日本触媒製、製品名「シーホスターKE-P150」)。
(10)架橋剤…ジクミルパーオキサイド。
(11)酸化亜鉛:平均粒径400~700、屈折率1.95の酸化亜鉛(正同化学工業(株)製、製品名「1号亜鉛華」)。
(12)軟化剤…プロセスオイル((株)ジャパンエナジー製、製品名「プロセスオイルP-200])。
シリカ及び酸化亜鉛の平均粒子径は、レーザー回折式粒度分布測定装置((株)セイシン企業製、製品名「SKレーザーマイクロンサイザーLMS-2000e」)を用いて測定した。平均粒子径は、3つの試料の平均値である。
レーザー光の透過率は、試験片(厚み2mmのシート)の一面に対し、法線方向から波長808nmのレーザー光を照射し、23℃で、レーザーパワーメーター(OPHIR社製、製品名「NOVA II」)を用いて測定した。
硬度は、JIS K 6253に準拠した、以下の方法で測定した。
スプリング式硬さ試験機A型を用いて、厚さ12mm以上の試験片(複数の試験片を積み重ねて12mm以上とする)に、前記試験機の押針が試験片測定面に垂直になるように試験機の加圧面を接触させ、試験片に9.81Nの荷重で押針を押し付けた後、すぐさま目盛りを読み取った。
比重は、JIS K 6268に準拠した、以下の方法で測定した。
電子天秤を用いて、空気中及び水中における試験片の重量をそれぞれ測定し、下式に代入することにより、比重を算出した。
D=W1/(W1-W2)
D:比重
W1:空気中での試験片の重量
W2:水中での試験片の重量
引張強さは、JIS K 6251に準拠した、以下の方法で測定した。
引張試験機((株)東洋精機製作所製、製品名「STROGRAPH-R2」)によりJIS K 6251に指定されたダンベル状2号形試験片の両端を前記試験機のチャックで掴み、500mm/minの速さで前記試験片が破断するまで引っ張り続けた。そして、破断した時の荷重と引っ張る前の狭部の断面積から引張強さを算出した。
伸びは、JIS K 6251に準拠した、以下の方法で測定した。
引張試験機((株)東洋精機製作所製、製品名「STROGRAPH-R2」)によりJIS K 6251に指定されたダンベル状2号形試験片の狭部に20mmの間隔を空けた標線を付け、前記試験片の両端を試験機のチャックで掴み、500mm/minの速さで前記試験片が破断するまで引っ張り続けた。そして、破断した時の標線間距離と引っ張る前の標線間距離(20mm)から伸びを算出した。
引裂強さは、JIS K 6252に準拠した、以下の方法で測定した。
引張試験機((株)東洋精機製作所製、製品名「STROGRAPH-R2」)によりJIS K 6252に指定されたアングル形試験片の両端を試験機のチャックで掴み、500mm/minの速さで前記試験片が破断するまで引っ張り続けた。そして、破断した時の荷重と引っ張る前の試験片厚みから引裂強さを算出した。
各材料を表1の組成に示す割合で配合し、これらをニーダー(DSS-10MWB-E型)を用いて、80℃で混練することによって混練物を得た。
次に、この混練物を、プレス機を用いて、160℃、圧力約14.7MPaで約20分間加圧して、厚み2mmのシートを作製した。なお、このシートを、縦長さ50mm、横長さ20mmに形成した。
このシートのレーザー光の透過率を測定した。その結果を、表1に示す。
なお、表1の組成において、各材料の配合量の単位は、質量部である(これは、表2~表4及び表6についても同様である)。
表1~表3の組成に示す割合で各材料を配合したこと以外は、実施例1と同様にして、それぞれ厚み2mmのシートを作製した。それぞれのシートのレーザー光の透過率を測定した。その結果を、各表に示す。
表3の組成に示す割合で各材料を配合したこと以外は、実施例1と同様にして、それぞれ厚み2mmのシートを作製した。それぞれのシートのレーザー光の透過率を測定した。その結果を、表3に示す。
表4の組成に示す割合で各材料を配合したこと以外は、実施例1と同様にして、それぞれ厚み2mmのシートを作製した。それぞれのシートのレーザー光の透過率を測定した。その結果を、表4に示す。
表6の組成に示す割合で各材料を配合したこと以外は、実施例1と同様にして、それぞれ厚み2mmのシートを作製した。それぞれのシートのレーザー光の透過率を測定した。その結果を、表6に示す。
上記実施例5のシート(以下、ゴム部材という)と、下記溶融接着シートと、下記被着体とを、上からこの順に重ね合わせることによって、3層構造の積層体を作製した。この積層体は、図1に示すような積層体である。
50質量部のエチレン-酢酸ビニル共重合体(東ソー(株)製、製品名「ウルトラセン631」。酢酸ビニル量20%)と、50質量部のシンジオタクチック1,2-ポリブタジエン(JSR(株)製、製品名「RB830」。1,2結合含有率:93%。MFR:3。融点:105℃。比重:0.91)と、0.1質量部の赤外線吸収色素(BASFジャパン(株)製、製品名「Lumogen IR788」)との混合物を、二軸混練機により混練した後、シート状に押出成形した。このシートを、溶融接着シートとして使用した。前記シートの厚みは200μm、縦長さは50mm、横長さは20mmであった。
100質量部のエチレン-酢酸ビニル共重合体(東ソー(株)製、製品名「ウルトラセン631」。酢酸ビニル量20%)と、3質量部の発泡剤(永和化成(株)製、製品名「AC#3C-K2」)と、0.6質量部の架橋剤(日本油脂(株)製、製品名パークミルD)と、0.5質量部の架橋助剤(新日本理化(株)製、ステアリン酸)と、1.5質量部の酸化亜鉛(本荘ケミカル(株)製、製品名「活性亜鉛華No.2」)との混合物を、混練機を用いて混練した。その後、これを、プレス機を用いて、160℃、圧力15MPaで約20分間加圧することにより、発泡体を成形した。この発泡体を被着体として使用した。この発泡体の密度は、0.20g/cm3であった。この発泡体の厚みは4mm、縦長さは50mm、横長さは20mmであった。
レーザー光の照射条件を表7に示す。ただし、表7の照射時間は、シューズ1足分(縦長さ300mm)に換算している。具体的には、照射時間は、式:照射時間=300(mm)/レーザー照射速度(mm/sec)から算出した。
前記条件下でレーザー光を照射した後、積層体を確認すると、溶融接着シートを介して、実施例5のゴム部材と被着体が接着されていた
ゴム部材の縁部と被着体の縁部を、引張試験機のそれぞれのチャックで掴み、両チャックを離すことによって、前記シートと発泡体を180度剥離した(言い換えると、シートの縁部と発泡体の縁部が約180度方向に離反するように、両者を引っ張った)。
剥離時の剥離強度を引張試験機から読みとった。その結果を表7に示す。
2 溶融接着シート
3 レーザー接着用被着体
5 積層体
10 シューズ
11 シューズの本体
12 シューズのミッドソール
13 シューズのアウターソール
Claims (6)
- ゴム成分と、シリカと、を含み、
前記シリカの平均粒子径が5nm~50nmであり、
前記シリカの量が、前記ゴム成分100質量部に対して、10質量部~100質量部であり、
レーザー光の透過率が30%以上である、レーザー接着用ゴム部材:
レーザー光の透過率は、ゴム部材の厚みを2mmとし、これに波長808nmのレーザー光を照射したときの透過率である。 - ゴム成分と、シリカと、を含み、
前記シリカの平均粒子径が50nmを超え120nm以下であり、
前記シリカの量が、前記ゴム成分100質量部に対して、10質量部~50質量部であり、
レーザー光の透過率が30%以上である、レーザー接着用ゴム部材:
レーザー光の透過率は、ゴム部材の厚みを2mmとし、これに波長808nmのレーザー光を照射したときの透過率である。 - 前記シリカが、平均粒子径50nmを超え120nm以下のシリカと平均粒子径5nm~50nmのシリカを含み、
前記平均粒子径50nmを超え120nm以下のシリカの量が、前記ゴム成分100質量部に対して、10質量部~50質量部であり、前記平均粒子径5nm~50nmのシリカの量が、前記ゴム成分100質量部に対して、10質量部~50質量部である請求項2に記載のレーザー接着用ゴム部材。 - 前記シリカの屈折率が1.5以下である、請求項1~3のいずれかに記載のレーザー接着用ゴム部材。
- さらに、酸化亜鉛を含み、前記酸化亜鉛の量が、前記ゴム成分100質量部に対して、3質量部以下である、請求項1~4のいずれかに記載のレーザー接着用ゴム部材。
- 請求項1~5のいずれかに記載のレーザー接着用ゴム部材を具備するシューズ。
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Also Published As
Publication number | Publication date |
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CN102725129A (zh) | 2012-10-10 |
JPWO2011045855A1 (ja) | 2013-03-04 |
EP2489496A1 (en) | 2012-08-22 |
EP2489496B1 (en) | 2016-01-06 |
CN102725129B (zh) | 2014-12-17 |
US10660398B2 (en) | 2020-05-26 |
JP5114594B2 (ja) | 2013-01-09 |
US20120198722A1 (en) | 2012-08-09 |
EP2489496A4 (en) | 2013-03-20 |
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