WO2006118198A1 - 空気入りタイヤ及びその製造方法 - Google Patents

空気入りタイヤ及びその製造方法 Download PDF

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Publication number
WO2006118198A1
WO2006118198A1 PCT/JP2006/308849 JP2006308849W WO2006118198A1 WO 2006118198 A1 WO2006118198 A1 WO 2006118198A1 JP 2006308849 W JP2006308849 W JP 2006308849W WO 2006118198 A1 WO2006118198 A1 WO 2006118198A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin layer
pneumatic tire
locking member
absorbing material
sound absorbing
Prior art date
Application number
PCT/JP2006/308849
Other languages
English (en)
French (fr)
Inventor
Atsushi Tanno
Original Assignee
The Yokohama Rubber Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Yokohama Rubber Co., Ltd. filed Critical The Yokohama Rubber Co., Ltd.
Priority to DE112006000971.0T priority Critical patent/DE112006000971B4/de
Priority to US11/919,113 priority patent/US8997805B2/en
Publication of WO2006118198A1 publication Critical patent/WO2006118198A1/ja
Priority to US14/618,367 priority patent/US9211685B2/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • 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
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7443—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc by means of ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
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    • B29C66/114—Single butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/727—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 structure of the material of the parts to be joined being porous, e.g. foam
    • 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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
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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
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10036—Cushion and pneumatic combined
    • Y10T152/10054—Enclosed cushion

Definitions

  • the present invention relates to a pneumatic tire provided with a sound absorbing material and a method for manufacturing the same, and more particularly, a pneumatic tire capable of improving the adhesiveness of a sound absorbing material having a porous material strength and a method for manufacturing the same. About.
  • one of the causes for generating noise is cavity resonance sound due to vibration of air filled in the tire. This cavity resonance sound is generated when the tread portion vibrates due to the unevenness of the road surface when the tire rolls, and the vibration of the tread portion vibrates the air inside the tire.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 64-78902
  • An object of the present invention is to provide a pneumatic tire and a method for manufacturing the same that can improve the adhesion of a sound absorbing material having a porous material strength.
  • a pneumatic tire according to the present invention for solving the above-mentioned object has a resin layer comprising a thermoplastic resin or a thermoplastic elastomer composition in which an elastomer is dispersed in a thermoplastic resin.
  • a sound absorbing material made of a porous material is formed on at least a part of the inner surface of the tire, and disposed on the resin layer, and a locking member made of thermoplastic resin is heated against the resin layer through the sound absorbing material. It is characterized by being fused.
  • the method for producing a pneumatic tire of the present invention for solving the above-described object comprises a thermoplastic resin or a thermoplastic elastomer composition in which an elastomer is dispersed in a thermoplastic resin.
  • a sound absorbing material made of a porous material is disposed on the resin layer, and a locking member made of thermoplastic resin is provided.
  • the heat-absorbing material is heat-sealed through the sound-absorbing material.
  • a resin layer having a thermoplastic resin as a matrix is formed on the inner surface of the tire.
  • a sound absorbing material is disposed on the resin layer, and a locking member made of thermoplastic resin is provided. It is heat-sealed to the resin layer through the sound absorbing material. Therefore, even when the sound absorbing material is made of a thermosetting resin such as polyurethane foam, the sound absorbing material can be firmly fixed to the tire inner surface. Fixing by such heat fusion can maintain the adhesive state of the sound-absorbing material, which has a porous material strength, which is stronger than the fixing by rubber adhesive or adhesive tape, over a long period of time. . Therefore, the noise reduction effect based on the sound absorbing material can be maintained for a long time.
  • the constituent material of the locking member is preferably the same type of thermoplastic resin as the resin contained in the resin layer, but the difference between the melting point of the locking member and the melting point of the resin layer is 20 ° C. The following is acceptable. If the melting points of the two are close to each other, heat fusion is easy.
  • the porous material of the sound absorbing material is preferably foamed polyurethane. That is, polyurethane foam is suitable as a constituent material of a sound absorbing material because it exhibits good sound absorbing characteristics.
  • the resin layer may be formed on a part of the inner surface of the tire as a base material for mounting the sound absorbing material.
  • the layer is preferably formed on the entire inner surface of the tire as an air permeation prevention layer.
  • the heat-sealed parts between the locking member and the resin layer are arranged at intervals in the tire circumferential direction, and the distance H is set to 0.2 W ⁇ H ⁇ 4W with respect to the width W of the sound absorbing material. It is preferable. This ensures good durability with minimal processing.
  • an ultrasonic welder for heat-sealing the locking member and the resin layer.
  • the locking member and the resin layer can be locally heated, so that the balance between workability and durability is excellent. It is.
  • a vibration horn with chamfered edges at both ends in the width direction is used as the vibration horn of the ultrasonic welder, it is possible to suppress the whitening phenomenon from occurring in the locking member and to improve durability. Is further improved.
  • FIG. 1 is a perspective cross-sectional view showing a pneumatic tire that is an embodiment of the present invention.
  • FIG. 2 shows an example of a heat fusion method between a locking member and a resin layer, and (a) to (c) are cross-sectional views of each step.
  • FIG. 3 is a perspective view showing an example of a vibration horn of an ultrasonic welder.
  • FIG. 4 is a perspective view showing another example of a vibration horn of an ultrasonic welder.
  • FIG. 5 is a perspective view showing another example of a vibration horn of an ultrasonic welder.
  • FIG. 6 is a front view of the vibration horn shown in FIG.
  • FIG. 7 is a cross-sectional view showing a heat-sealing structure of a locking member.
  • FIG. 8 is a cross-sectional view showing a sound absorbing material provided with notches in advance.
  • FIG. 9 is a cross-sectional view showing a sound absorbing material in which cuts are previously provided.
  • FIG. 10 is a plan view showing a state in which the sound absorbing material mounted on the tire inner surface is developed on a plane.
  • FIG. 11 is a cross-sectional view showing a modified example of the mounting structure of the sound absorbing material mounted on the tire inner surface on a plane.
  • FIG. 12 is a cross-sectional view showing a state in which a modified example of the mounting structure of the sound absorbing material mounted on the tire inner surface is developed on a plane.
  • FIG. 13 is a plan view showing a state in which a modified example of the mounting structure of the sound absorbing material attached to the tire inner surface is developed on a plane.
  • FIG. 14 is a plan view showing a state in which a modified example of the mounting structure of the sound absorbing material mounted on the tire inner surface is developed on a plane.
  • FIG. 1 shows a pneumatic tire which is also an embodiment of the present invention.
  • the pneumatic tire includes a tread portion 1, a pair of left and right bead portions 2, and the tread portion 1 and the beads.
  • a side wall part 3 is provided to connect the part 2 to each other.
  • a resin layer 4 is formed as an air permeation preventive layer over the entire area.
  • This resin layer 4 is composed of a thermoplastic elastomer or a thermoplastic elastomer composition in which an elastomer is dispersed in a thermoplastic resin.
  • a sound absorbing material 5 having a porous material force is attached to the inner surface of the tread portion 1.
  • the sound absorbing material 5 has a large number of internal cells and has predetermined sound absorbing characteristics based on its porous structure. It is good to use foamed polyurethane as the porous material of the sound absorbing material 5.
  • heat fusion using a plate-shaped locking member 7 (locking plate or locking chip) made of thermoplastic resin is employed. That is, the sound absorbing material 5 is disposed on the resin layer 4, and the locking member 7 is heat-sealed to the resin layer 4 through the sound absorbing material 5.
  • the heat-sealed portion may be at one location on the tire circumference, but preferably at a plurality of locations, more preferably at least 4 locations, and they should be arranged at equal intervals in the tire circumferential direction.
  • the constituent material of the locking member 7 is preferably the same type of thermoplastic resin as the resin included in the resin layer 4.
  • the constituent material of the locking member 7 may be the same as that of one of the resins included in the resin layer 4.
  • the melting point of the locking member 7 and the melting point of the resin layer 4 should be close to each other in order to facilitate heat fusion, but the melting point difference should be 20 ° C or less.
  • the difference between the melting point of the locking member 7 and the melting point of the resin layer 4 is preferably 10 ° C or less, more preferably 5 ° C or less.
  • FIGS. 2 (a) to 2 (c) show an example of a heat-sealing method between the locking member and the resin layer.
  • the sound absorbing material 5 is disposed on the resin layer 4, and a plate-like locking member 7 made of thermoplastic resin is further disposed on the sound absorbing material 5.
  • the vibration horn 11 of the ultrasonic welder is pressed against the locking member 7, the locking member 7 is bent, and the bent tip portion is locally Heat up.
  • FIG. 2 (c) the locking member 7 and the resin layer 4 are heat-sealed through the sound absorbing material 5 to form a heat-sealing portion 8.
  • the shape of the vibration horn 11 is not particularly limited.
  • the shape shown in Figs. 3 to 5 should be adopted. You can.
  • the vibration horn 11 is processed into a straight line with a sharp tip.
  • the vibration horn 11 is machined into a rectangular surface with an elongated tip.
  • Figure 5 Odor Thus, the vibration horn 11 has a tip that is processed into an elongated rectangular surface, and chamfered portions 11a are formed at both ends in the width direction of the tip.
  • FIG. 6 is a side view of the vibration horn shown in FIG.
  • the radius of curvature of the chamfered part 11a is preferably 2 mm or more.
  • the dimensions and shape of the locking member 7 are not particularly limited.
  • the shape of the locking member 7 may be, for example, a quadrangle, and in that case, the corner may be rounded. Thereby, damage to the sound absorbing material 5 due to the locking member 7 can be reduced.
  • the clearance C between the end portion of the locking member 7 and the upper surface of the sound absorbing material 5 is 0.5 mm ⁇ C ⁇ 8 while being heat-sealed to the resin layer 4. It is preferable to use Omm. If the clearance C is less than 0.5 mm, the sound absorbing material 5 is liable to be damaged by the locking member 7. On the contrary, if the clearance C exceeds 8. Omm, no further effect is obtained.
  • the sound-absorbing material 5 may be provided with a notch 5a as shown in FIG. 8 or a cut 5b as shown in FIG.
  • a resin layer 4 having a thermoplastic resin as a matrix is formed on the inner surface of the tire, while a sound absorbing material 5 is disposed on the resin layer 4 and is made of a thermoplastic resin. Since the locking member 7 is thermally fused to the resin layer 4 through the sound absorbing material 5, even if the sound absorbing material 5 is composed of a thermosetting resin such as polyurethane foam, the sound absorbing material is used. The material 5 can be firmly fixed to the resin layer 4. Fixing by heat fusion can improve the adhesion of the sound-absorbing material 5, which is a porous material that has stronger adhesive strength than fixing by rubber adhesive or adhesive tape.
  • FIG. 10 shows a state where the sound absorbing material mounted on the tire inner surface is developed on a plane.
  • the heat-sealed portion 8 between the locking member 7 and the resin layer 4 is arranged with a space (pitch) in the tire circumferential direction, and the space H is set to the width W of the sound absorbing material 5.
  • the space H is set to the width W of the sound absorbing material 5.
  • H workability at the time of heat-sealing deteriorates.
  • H> 4W the bonding state of the sound absorbing material 5 to the resin layer 4 becomes unstable.
  • the positions of the heat fusion parts 8 do not necessarily need to be equally spaced.
  • the length Lt (dimension before heat sealing) of the locking member 7 may be in the range of 50 to 200% of the thickness of the sound absorbing material 5. Furthermore, the thickness of the locking member 7 is It may be in the range of 50 to 150% of the thickness of the oil layer 4.
  • Figs. 11 and 12 show a state in which a modification of the mounting structure of the sound absorbing material mounted on the tire inner surface is developed on a plane.
  • the locking member 7 continuously extends in the tire circumferential direction along the resin layer 4, and the locking member 7 is attached to the resin layer 4 via a plurality of heat fusion portions 8. It is fixed.
  • the length of the force locking member 7 in which the locking member 7 continuously extends in the tire circumferential direction along the resin layer 4 is provided with a margin.
  • FIG. 13 and FIG. 14 show a state in which the modified examples of the sound absorbing material mounted on the tire inner surface are each expanded on a plane.
  • the sound-absorbing material 5 may be composed of a plurality of divided pieces, and these divided pieces may be arranged along the resin layer 4 in the tire circumferential direction. In this case, it is preferable that each divided piece of the sound-absorbing material 5 is heat-sealed to the resin layer 4 at at least two locations.
  • this resin layer is composed of a thermoplastic resin composition or a thermoplastic elastomer composition in which an elastomer is dispersed in a thermoplastic resin.
  • a thermoplastic elastomer composition it is preferable to use as a constituent material of the resin layer.
  • thermoplastic resin component of the thermoplastic elastomer composition any thermoplastic resin having a Young's modulus exceeding 500 MPa, preferably 500 to 3000 MPa, can be used. It is at least 10% by weight, preferably 20 to 85% by weight, based on the total weight of the polymer components including the elastomer.
  • thermoplastic resin examples include polyamide-based resin [for example, nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (? ⁇ 11), nylon 12 ( ? 12), nylon 610 (N610), nylon 612 (N612), nylon 6Z66 copolymer (N6Z66), nylon 6Z66Z610 copolymer (N6Z66Z610), nylon MXD6, nylon 6T, nylon 6 ⁇ 6 ⁇ copolymer, nylon 66 ⁇ Copolymer, nylon 66ZPPS copolymer), polyester-based resin (for example, polybutylene terephthalate ( ⁇ ), polyethylene terephthalate (PET), polyethylene isophthalate ( ⁇ ), polybutylene terephthalate ⁇ tetra Methylene glycol copolymer, PETZPEI copolymer, polyarylate (PAR), polybutylene naphthalate (PBN), liquid crystal polyester, polyoxyalkylene diimide diacid Z polybutylene tere
  • thermoplastic resins do not contain an elastomer component and can be used as a single resin material.
  • the elastomer component of the thermoplastic elastomer composition may be any elastomer having a Young's modulus of 500 MPa or less, or a reinforcing agent, a filler, a cross-linking agent for improving the dispersibility and heat resistance of the elastomer. It is possible to use an elastomer composition containing a necessary amount of compounding agents such as an agent, a softening agent, an anti-aging agent, and a processing aid, and the blending amount is 10 per total weight of the polymer components including rosin and elastomer. % By weight or more, preferably 10 to 80% by weight.
  • Examples of such elastomers include, for example, Gen rubber and hydrogenated products thereof (eg, NR, IR, epoxidized natural rubber, SBR, BR (high cis BR and low cis BR), NBR, hydrogen NBR, hydrogenated SBR], olefin rubber [eg ethylene propylene rubber (EPDM, EPM), maleic acid-modified ethylene propylene rubber (M-EPM)], butinole rubber (IIR), isobutylene and aromatic bur or gen Monomer copolymer, acrylic rubber (ACM), ionomer, halogen-containing rubber [eg Br—IIR, CI-IIR, isobutylene paramethylstyrene copolymer bromide (Br—IPMS), chloroprene rubber (CR), hydrin rubber (CH C, CHR), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), maleic acid-modified chlorinated polyethylene (M—
  • thermoplastic elastomer composition in addition to the above essential components, as a third component, another polymer such as a compatibility additive and a compounding agent can be mixed.
  • a compatibility additive and a compounding agent can be mixed.
  • the purpose of mixing other polymers is to improve the compatibility between the thermoplastic resin component and the elastomer component, to improve the film forming ability of the material, to improve heat resistance, and to reduce costs.
  • polyethylene, polypropylene, polystyrene, ABS, SBS, polycarbonate and the like can be used as a material for this.
  • the thermoplastic elastomer composition is a thermoplastic elastomer in which a thermoplastic resin and an elastomer (unvulcanized in the case of rubber) are previously melt-kneaded with a twin-screw kneading extruder or the like to form a continuous phase. It is obtained by dispersing an elastomer component in the fat.
  • a vulcanizing agent may be added under kneading to dynamically vulcanize the elastomer.
  • various compounding agents for thermoplastic resin or elastomer component may be added during the kneading, but it is preferable to mix them in advance before kneading.
  • the kneading machine used for kneading the thermoplastic resin and the elastomer include a screw extruder, a kneader, a Banbury mixer, and a twin-screw kneading extruder that are not particularly limited.
  • thermoplastic elastomer composition produced by the above method is obtained by a resin extruder. It is formed into a film by molding or calendering.
  • the method for forming a film may be a method of forming a normal thermoplastic resin or thermoplastic elastomer into a film.
  • the thermoplastic elastomer composition is used for forming a tire in a state where it is formed into a sheet or a film.
  • an adhesive layer may be laminated in order to enhance the adhesiveness with an adjacent rubber.
  • Specific examples of the adhesive polymer constituting the adhesive layer include ultra high molecular weight polyethylene (UHMWPE), ethylene ethyl acrylate copolymer (EEA), ethylene methyl having a molecular weight of 1 million or more, preferably 3 million or more.
  • Atarylate copolymers such as attalylate resin (EMA) and ethylene acrylic acid copolymer (EAA) and their maleic anhydride-containing calories, polypropylene (PP) and its modified maleic acid, ethylene propylene copolymer Copolymer and its modified maleic acid, polybutadiene-based resin and its modified maleic anhydride, styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-butadiene-styrene copolymer (SEBS), fluorine-based thermoplastic resin, polyester And the like.
  • the thickness of the adhesive layer is not particularly limited, but it is preferably 5 / z ⁇ to 150 / ⁇ m with a smaller thickness for light weight tires.
  • the conventional example and the pneumatic tires of Examples 1 and 2 were produced.
  • a sound-absorbing material made of a band-like urethane foam (width 150 mm x thickness 20 mm) is fixed to the inner surface of the tread portion over the entire circumference of the tire using a rubber adhesive.
  • the pneumatic tires of Examples 1 and 2 form a resin layer made of a thermoplastic elastomer composition on the entire inner surface of the tire, and also have a belt-like urethane foam (width 150 mm x thickness 20 mm) force.
  • the sound absorbing material is placed over the entire tire circumference on the grease layer in the tread part, and the locking tips are placed on the sound absorbing material at intervals of about 200 mm along the tire circumferential direction, using an ultrasonic welder.
  • the locking tip is heat-sealed to the resin layer.
  • the difference between the melting point of the locking member and the melting point of the resin layer is set to about 30 ° C
  • Example 2 the difference between the melting point of the locking member and the melting point of the resin layer is set to about 5 ° C. Set to ° C It was.
  • a running test was performed on the pneumatic tires of the conventional example and Examples 1 and 2 with a drum tester under the conditions of an internal pressure of 150 kPa and a speed of 80 kmZh, and the running distance until the sound absorbing material was peeled off was determined. It was measured. The results are shown in Table 1. The evaluation results are shown as an index with the conventional example as 100. The larger the index value, the better the durability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Tyre Moulding (AREA)
  • Laminated Bodies (AREA)

Abstract

　多孔質材料からなる吸音材の接着性を向上することを可能にした空気入りタイヤ及びその製造方法を提供する。本発明の空気入りタイヤは、熱可塑性樹脂又は熱可塑性樹脂中にエラストマーが分散している熱可塑性エラストマー組成物からなる樹脂層をタイヤ内面の少なくとも一部に形成し、多孔質材料からなる吸音材を前記樹脂層の上に配置し、熱可塑性樹脂からなる係止部材を前記吸音材を通して前記樹脂層に対して熱融着したものである。

Description

明 細 書
空気入りタイヤ及びその製造方法
技術分野
[0001] 本発明は、吸音材を備えた空気入りタイヤ及びその製造方法に関し、さらに詳しく は、多孔質材料力 なる吸音材の接着性を向上することを可能にした空気入りタイヤ 及びその製造方法に関する。
背景技術
[0002] 空気入りタイヤにおいて、騒音を発生させる原因の一つにタイヤ内部に充填された 空気の振動による空洞共鳴音がある。この空洞共鳴音は、タイヤを転動させたときに トレッド部が路面の凹凸によって振動し、トレッド部の振動がタイヤ内部の空気を振動 させることによって生じるのである。
[0003] このような空洞共鳴現象による騒音を低減する手法として、タイヤとホイールのリムと の間に形成される空洞部内に吸音材を配設することが提案されている。（例えば、特 許文献 1参照)。し力しながら、吸音材をホイールのリム外周面に貼り付ける場合、吸 音材がリム組み作業を阻害することになる。一方、吸音材をタイヤ内面に貼り付ける 場合、耐久性の面で問題がある。つまり、発泡ポリウレタンのような多孔質材料力 な る吸音材をゴム系接着剤や粘着テープを用いてタイヤ内面に固定した場合、その接 着力が不足して吸音材カ^イヤ内面力も脱落することがある。
特許文献 1 :日本国特開昭 64— 78902号公報
発明の開示
[0004] 本発明の目的は、多孔質材料力 なる吸音材の接着性を向上することを可能にし た空気入りタイヤ及びその製造方法を提供することにある。
[0005] 上記目的を解決するための本発明の空気入りタイヤは、熱可塑性榭脂又は熱可塑 性榭脂中にエラストマ一が分散して ヽる熱可塑性エラストマ一組成物からなる榭脂層 をタイヤ内面の少なくとも一部に形成し、多孔質材料からなる吸音材を前記榭脂層の 上に配置し、熱可塑性榭脂からなる係止部材を前記吸音材を通して前記榭脂層に 対して熱融着したことを特徴とするものである。 [0006] また、上記目的を解決するための本発明の空気入りタイヤの製造方法は、熱可塑 性榭脂又は熱可塑性榭脂中にエラストマ一を分散させてなる熱可塑性エラストマ一 組成物からなる榭脂層をタイヤ内面の少なくとも一部に備えた空気入りタイヤを加硫 した後、多孔質材料からなる吸音材を前記榭脂層の上に配置し、熱可塑性榭脂から なる係止部材を前記吸音材を通して前記榭脂層に対して熱融着するようにしたことを 特徴とするものである。
[0007] 本発明では、タイヤ内面に熱可塑性榭脂をマトリックスとする榭脂層を形成する一 方で、吸音材を榭脂層の上に配置し、熱可塑性榭脂からなる係止部材を吸音材を通 して榭脂層に対して熱融着する。そのため、吸音材が発泡ポリウレタンのような熱硬 化性榭脂から構成される場合であっても、吸音材をタイヤ内面に対して強固に固定 することができる。このような熱融着による固定は、ゴム系接着剤や粘着テープによる 固定に比べて接着力が強ぐ多孔質材料力 なる吸音材の接着状態を長期間にわ たって良好に維持することができる。従って、吸音材に基づく騒音低減効果を長期間 にわたつて持続することができる。
[0008] 係止部材の構成材料は榭脂層に含まれる榭脂と同種の熱可塑性榭脂であることが 好ましいが、係止部材の融点と榭脂層の融点との差が 20°C以下であれば良い。両 者の融点が互いに近似していれば熱融着が容易である。一方、吸音材の多孔質材 料は発泡ポリウレタンであると良い。つまり、発泡ポリウレタンは良好な吸音特性を呈 するため吸音材の構成材料として好適である。
[0009] 本発明の空気入りタイヤにおいて、榭脂層は吸音材を装着するための基材としてタ ィャ内面の一部に形成しても良いが、素材を有効に活用するために榭脂層を空気透 過防止層としてタイヤ内面の全面に形成することが好ましい。また、係止部材と榭脂 層との熱融着部はタイヤ周方向に間隔をあけて配置し、その間隔 Hを吸音材の幅 W に対して 0. 2W≤H≤4Wの関係にすることが好ましい。これにより、最小限の加工で 良好な耐久性を確保することができる。
[0010] 本発明の空気入りタイヤの製造方法において、係止部材と榭脂層との熱融着には 超音波溶着機を用いることが好ましい。このような超音波溶着機を用いた場合、係止 部材と榭脂層を局部的に加熱することができるので、加工性と耐久性のバランスが優 れている。また、超音波溶着機の加振用ホーンとして、先端の幅方向両端部に面取 りを施した加振用ホーンを採用すれば、係止部材に白化現象が生じるのを抑制し、 耐久性が更に向上する。
図面の簡単な説明
[0011] [図 1]本発明の実施形態力 なる空気入りタイヤを示す斜視断面図である。
[図 2]係止部材と榭脂層との熱融着方法の一例を示し、 (a)〜 (c)は各工程の断面図 である。
[図 3]超音波溶着機の加振用ホーンの一例を示す斜視図である。
[図 4]超音波溶着機の加振用ホーンの他の例を示す斜視図である。
[図 5]超音波溶着機の加振用ホーンの他の例を示す斜視図である。
[図 6]図 5に示す加振用ホーンの正面図である。
[図 7]係止部材の熱融着構造を示す断面図である。
[図 8]予め切り欠き部を設けた吸音材を示す断面図である。
[図 9]予め切り目を設けた吸音材を示す断面図である。
[図 10]タイヤ内面に装着された吸音材を平面上に展開した状態を示す平面図である
[図 11]タイヤ内面に装着された吸音材の取り付け構造の変形例を平面上に展開した 状態を示す断面図である。
[図 12]タイヤ内面に装着された吸音材の取り付け構造の変形例を平面上に展開した 状態を示す断面図である。
[図 13]タイヤ内面に装着された吸音材の取り付け構造の変形例を平面上に展開した 状態を示す平面図である。
[図 14]タイヤ内面に装着された吸音材の取り付け構造の変形例を平面上に展開した 状態を示す平面図である。
発明を実施するための最良の形態
[0012] 以下、本発明の構成について添付の図面を参照しながら詳細に説明する。
図 1は本発明の実施形態力もなる空気入りタイヤを示すものである。図 1において、 空気入りタイヤは、トレッド部 1と、左右一対のビード部 2と、これらトレッド部 1とビード 部 2とを互いに連接するサイドウォール部 3とを備えている。空気入りタイヤの内面に は、その全域にわたって空気透過防止層として榭脂層 4が形成されている。この榭脂 層 4は、熱可塑性榭脂又は熱可塑性榭脂中にエラストマ一が分散して ヽる熱可塑性 エラストマ一組成物力 構成されて 、る。
[0013] 図 1に示すように、トレッド部 1の内面には、多孔質材料力 なる吸音材 5が装着さ れている。吸音材 5は多数の内部セルを有し、その多孔質構造に基づく所定の吸音 特性を有して 、る。吸音材 5の多孔質材料としては発泡ポリウレタンを用いると良 、。 吸音材 5と榭脂層 4との固定手段としては、熱可塑性榭脂製の板状の係止部材 7 (係 止板又は係止チップ)を用いた熱融着が採用されている。即ち、吸音材 5は榭脂層 4 の上に配置され、係止部材 7が吸音材 5を通して榭脂層 4に対して熱融着されている 。熱融着部は、タイヤ周上の 1箇所でも良いが、好ましくは複数箇所、更に好ましくは 4箇所以上とし、タイヤ周方向に等間隔で配置するのが良い。
[0014] 係止部材 7の構成材料は榭脂層 4に含まれる榭脂と同種の熱可塑性榭脂であるこ とが好ましい。榭脂層 4がマトリックスとして複数種類の榭脂を含む場合、係止部材 7 の構成材料は榭脂層 4に含まれる榭脂の一つと同種であれば良 、。係止部材 7の融 点と榭脂層 4の融点は、熱融着を容易にするために互いに近似して 、ることが望まし いが、その融点差が 20°C以下であれば良い。係止部材 7の融点と榭脂層 4の融点と の差は、好ましくは 10°C以下、更に好ましくは 5°C以下とする。
[0015] 図 2 (a)〜（c)は係止部材と榭脂層との熱融着方法の一例を示すものである。先ず 、図 2 (a)に示すように、吸音材 5を榭脂層 4の上に配置し、更に吸音材 5の上に熱可 塑性榭脂製の板状の係止部材 7を配置する。次に、図 2 (b)に示すように、超音波溶 着機の加振用ホーン 11を係止部材 7に押し付け、係止部材 7を折り曲げた状態にし 、その折り曲げられた先端部分を局部的に加熱する。これにより、図 2 (c)に示すよう に、吸音材 5を通して係止部材 7と榭脂層 4とを熱融着して熱融着部 8を形成する。
[0016] 超音波溶着機を用いた熱融着において、加振用ホーン 11の形状は特に限定され るものではないが、例えば、図 3〜図 5に示すような形状のものを採用することができ る。図 3において、加振用ホーン 11は、先端が鋭利な直線状に加工されている。図 4 において、加振用ホーン 11は、先端が細長い矩形面に加工されている。図 5におい て、加振用ホーン 11は、先端が細長い矩形面に加工され、更に先端の幅方向両端 部に面取り部 11aが形成されている。図 6は、図 5に示す加振用ホーンの側面図であ る。面取り部 11aの曲率半径は 2mm以上であると良い。加振用ホーン 11の先端の 幅方向両端部に面取りを施すことにより、加振用ホーン 11に押圧に起因して係止部 材 7に白化現象が生じるのを抑制することができる。
[0017] 超音波溶着機を用いた熱融着に際して、係止部材 7の寸法及び形状は特に限定さ れるものではない。係止部材 7の形状は、例えば、四角形とすれば良いが、その場合 、角に丸みを付けると良い。これにより、係止部材 7による吸音材 5の損傷を軽減する ことができる。また、図 7に示すように、榭脂層 4に対して熱融着された状態で、係止 部材 7の端部と吸音材 5の上面とのクリアランス Cは、 0. 5mm≤C≤8. Ommにする ことが好ましい。クリアランス Cが 0. 5mm未満であると係止部材 7による吸音材 5の損 傷を生じ易くなり、逆に 8. Ommを超えてもそれ以上の効果は得られない。吸音材 5 には、係止部材 7を配置する部位に、図 8に示すような切り欠き部 5aや図 9に示すよう な切れ目 5bを設けるようにしても良 、。
[0018] 上記空気入りタイヤでは、タイヤ内面に熱可塑性榭脂をマトリックスとする榭脂層 4 を形成する一方で、吸音材 5を榭脂層 4の上に配置し、熱可塑性榭脂製の係止部材 7を吸音材 5を通して榭脂層 4に対して熱融着しているため、吸音材 5が発泡ポリウレ タンのような熱硬化性榭脂から構成される場合であっても、吸音材 5を榭脂層 4に対 して強固に固定することができる。熱融着による固定は、ゴム系接着剤や粘着テープ による固定に比べて接着力が強ぐ多孔質材料力 なる吸音材 5の接着性を向上す ることがでさる。
[0019] 図 10はタイヤ内面に装着された吸音材を平面上に展開した状態を示すものである 。図 10に示すように、係止部材 7と榭脂層 4との熱融着部 8はタイヤ周方向に間隔 (ピ ツチ）をあけて配置し、その間隔 Hを吸音材 5の幅 Wに対して 0. 2W≤H≤4Wの関 係にすると良い。 0. 2W>Hであると熱融着時の作業性が低下し、逆に H>4Wであ ると榭脂層 4に対する吸音材 5の接合状態が不安定になる。なお、熱融着部 8の位置 は必ずしも等間隔である必要はない。また、係止部材 7の長さ Lt (熱融着前の寸法） は吸音材 5の厚さの 50〜200%の範囲であれば良い。更に、係止部材 7の厚さは榭 脂層 4の厚さの 50〜 150%の範囲にあれば良い。
[0020] 図 11及び図 12はタイヤ内面に装着された吸音材の取り付け構造の変形例をそれ ぞれ平面上に展開した状態を示すものである。図 11において、係止部材 7は榭脂層 4に沿ってタイヤ周方向に連続的に延在しており、この係止部材 7が複数の熱融着部 8を介して榭脂層 4に固定されている。図 12では、図 11と同様に係止部材 7が榭脂 層 4に沿ってタイヤ周方向に連続的に延在している力 係止部材 7の長さに余裕を持 たせている。
[0021] 図 13及び図 14はタイヤ内面に装着された吸音材の変形例をそれぞれ平面上に展 開した状態を示すものである。図 13及び図 14に示すように、吸音材 5を複数の分割 片から構成し、これら分割片を榭脂層 4に沿ってタイヤ周方向に並べるようにしても良 い。この場合、吸音材 5の各分割片を榭脂層 4に対して少なくとも 2箇所で熱融着す ることが好ましい。
[0022] 以下、タイヤ内面に形成される榭脂層の構成材料について詳細に説明する。この 榭脂層は、上述した通り、熱可塑性榭脂又は熱可塑性榭脂中にエラストマ一が分散 している熱可塑性エラストマ一組成物カゝら構成される。特に、榭脂層を空気透過防止 層としてタイヤ内面の全域にわたって形成する場合、榭脂層の構成材料として熱可 塑性エラストマ一組成物を用いると良い。
[0023] 熱可塑性エラストマ一組成物の熱可塑性榭脂成分としては、ヤング率が 500MPa 超、好ましくは 500〜3000MPaの任意の熱可塑性榭脂を用いることができ、その配 合量は榭脂及びエラストマ一を含むポリマー成分の合計重量当り 10重量％以上、好 ましくは 20〜85重量％である。
[0024] そのような熱可塑性榭脂としては、例えば、ポリアミド系榭脂〔例えばナイロン 6 (N6 )、ナイロン 66 (N66)、ナイロン 46 (N46)、ナイロン 11 (?^11)、ナィロン12 (?^12)、 ナイロン 610 (N610)、ナイロン 612 (N612)、ナイロン 6Z66共重合体（N6Z66)、 ナイロン 6Z66Z610共重合体（N6Z66Z610)、ナイロン MXD6、ナイロン 6T、ナ ィロン 6Ζ6Τ共重合体、ナイロン 66ΖΡΡ共重合体、ナイロン 66ZPPS共重合体〕、 ポリエステル系榭脂〔例えばポリブチレンテレフタレート (ΡΒΤ)、ポリエチレンテレフタ レート（PET)、ポリエチレンイソフタレート（ΡΕΙ)、ポリブチレンテレフタレート Ζテトラ メチレングリコール共重合体、 PETZPEI共重合体、ポリアリレート（PAR)、ポリブチ レンナフタレート（PBN)、液晶ポリエステル、ポリオキシアルキレンジイミドジ酸 Zポリ ブチレンテレフタレート共重合体などの芳香族ポリエステル〕、ポリ-トリル系榭脂〔例 えばポリアクリロニトリル（PAN)、ポリメタクリロ-トリル、アクリロニトリル Zスチレン共 重合体 (AS)、メタタリ口-トリル Zスチレン共重合体、メタタリ口-トリル Zスチレン Z ブタジエン共重合体〕、ポリ (メタ)アタリレート系榭脂〔例えばポリメタクリル酸メチル (P MMA)、ポリメタクリル酸ェチル、エチレンェチルアタリレート共重合体（EEA)、ェチ レンアクリル酸共重合体 (EAA)、エチレンメチルアタリレート榭脂（EMA)〕、ポリビ- ル系榭脂〔例えば酢酸ビュル（EVA)、ポリビュルアルコール（PVA)、ビュルアルコ ール Zエチレン共重合体 (EVOH)、ポリ塩ィ匕ビユリデン (PVDC)、ポリ塩ィ匕ビュル（
PVC)、塩ィ匕ビュル Z塩ィ匕ビユリデン共重合体、塩ィ匕ビユリデン Zメチルアタリレート 共重合体〕、セルロース系榭脂〔例えば酢酸セルロース、酢酸酪酸セルロース〕、フッ 素系榭脂〔例えばポリフッ化ビ-リデン（PVDF)、ポリフッ化ビュル (PVF)、ポリクロ ルフルォロエチレン（PCTFE)、テトラフロロエチレン Zエチレン共重合体（ETFE)〕 、イミド系榭脂〔例えば芳香族ポリイミド (PI)〕などを挙げることができる。これら熱可塑 性榭脂はエラストマ一成分を含まな 、単独の榭脂材料として用いても良 、。
[0025] 熱可塑性エラストマ一組成物のエラストマ一成分としては、ヤング率が 500MPa以 下の任意のエラストマ一又は該エラストマ一の分散性や耐熱性などの改善のために 補強剤、充填剤、架橋剤、軟化剤、老化防止剤、加工助剤などの配合剤を必要量添 カロしたエラストマ一組成物を用いることができ、その配合量は榭脂及びエラストマ一を 含むポリマー成分の合計重量当り 10重量％以上、好ましくは 10〜80重量％である。
[0026] そのようなエラストマ一としては、例えば、ジェン系ゴム及びその水素添加物〔例え ば NR、 IR、エポキシ化天然ゴム、 SBR、 BR (高シス BR及び低シス BR)、 NBR、水 素化 NBR、水素化 SBR〕、ォレフイン系ゴム〔例えばエチレンプロピレンゴム（EPDM 、 EPM)、マレイン酸変'性エチレンプロピレンゴム（M— EPM)〕、ブチノレゴム（IIR)、 イソブチレンと芳香族ビュル又はジェン系モノマー共重合体、アクリルゴム (ACM)、 アイオノマー、含ハロゲンゴム〔例えば Br— IIR、 CI -IIR,イソブチレンパラメチルス チレン共重合体の臭素化物（Br— IPMS)、クロロプレンゴム（CR)、ヒドリンゴム（CH C, CHR)、クロロスルホン化ポリエチレン（CSM)、塩素化ポリエチレン（CM)、マレ イン酸変性塩素化ポリエチレン (M— CM)〕、シリコーンゴム（例えばメチルビ-ルシリ コーンゴム、ジメチルシリコーンゴム、メチルフエ-ルビ-ルシリコーンゴム）、含ィォゥ ゴム（例えばポリスルフイドゴム）、フッ素ゴム（例えばビ-リデンフルオライド系ゴム、含 フッ素ビュルエーテル系ゴム、テトラフルォロエチレン プロピレン系ゴム、含フッ素 シリコン系ゴム、含フッ素ホスファゼン系ゴム）、熱可塑性エラストマ一（例えばスチレ ン系エラストマ一、ォレフィン系エラストマ一、ポリエステノレ系エラストマ一、ウレタン系 エラストマ一、ポリアミド系エラストマ一）などを挙げることができる。
[0027] 熱可塑性エラストマ一組成物には、上記必須成分に加えて第三成分として、相溶 ィ匕剤などの他のポリマー及び配合剤を混合することができる。他のポリマーを混合す る目的は、熱可塑性榭脂成分とエラストマ一成分との相溶性を改良するため、材料の フィルム成形力卩ェ性を良くするため、耐熱性向上のため、コストダウンのため等であり 、これに用いられる材料としては、例えばポリエチレン、ポリプロピレン、ポリスチレン、 ABS、 SBS、ポリカーボネート等が挙げられる。
[0028] 熱可塑性エラストマ一組成物は、予め熱可塑性榭脂とエラストマ一（ゴムの場合は 未加硫物）とを 2軸混練押出機等で溶融混練し、連続相を形成する熱可塑性榭脂中 にエラストマ一成分を分散させることにより得られる。エラストマ一成分を加硫する場 合には、混練下で加硫剤を添加し、エラストマ一を動的に加硫させても良い。また、 熱可塑性榭脂またはエラストマ一成分への各種配合剤 (加硫剤を除く）は、上記混練 中に添加しても良いが、混練の前に予め混合しておくことが好ましい。熱可塑性榭脂 とエラストマ一の混練に使用する混練機としては、特に限定はなぐスクリュー押出機 、ニーダ、バンバリミキサー、 2軸混練押出機等が挙げられる。中でも榭脂成分とゴム 成分の混練およびゴム成分の動的加硫には 2軸混練押出機を使用するのが好まし い。さらに、 2種類以上の混練機を使用し、順次混練してもよい。溶融混練の条件とし て、温度は熱可塑性榭脂が溶融する温度以上であれば良い。また、混練時の剪断 速度は 2500〜7500sec— 1であるのが好ましい。混練全体の時間は 30秒から 10分、 また加硫剤を添加した場合には、添加後の加硫時間は 15秒から 5分であるのが好ま しい。上記方法で作製された熱可塑性エラストマ一組成物は、榭脂用押出機による 成形またはカレンダー成形によってフィルム化される。フィルム化の方法は、通常の 熱可塑性榭脂または熱可塑性エラストマ一をフィルム化する方法によれば良い。
[0029] 上記熱可塑性エラストマ一組成物はシート又はフィルムに成形された状態でタイヤ 成形に用いられるが、隣接するゴムとの接着性を高めるために接着層を積層しても良 い。この接着層を構成する接着用ポリマーの具体例としては、分子量 100万以上、好 ましくは 300万以上の超高分子量ポリエチレン（UHMWPE)、エチレンェチルアタリ レート共重合体（EEA)、エチレンメチルアタリレート榭脂（EMA)、エチレンアクリル 酸共重合体 (EAA)等のアタリレート共重合体類及びそれらの無水マレイン酸付カロ 物、ポリプロピレン（PP)及びそのマレイン酸変性物、エチレンプロピレン共重合体及 びそのマレイン酸変性物、ポリブタジエン系榭脂及びその無水マレイン酸変性物、ス チレン ブタジエン スチレン共重合体（SBS)、スチレン エチレン ブタジエン スチレン共重合体 (SEBS)、フッ素系熱可塑性榭脂、ポリエステル系熱可塑性榭脂 などを挙げることができる。接着層の厚さは特に限定されないが、タイヤ軽量ィ匕のた めには厚さが少ない方がよぐ 5 /z πι〜150 /ζ mが好ましい。
[0030] 以上、本発明の好ましい実施形態について詳細に説明したが、添付の請求の範囲 によって規定される本発明の精神及び範囲を逸脱しない限りにおいて、これに対して 種々の変更、代用及び置換を行うことができると理解されるべきである。
実施例
[0031] 従来例及び実施例 1, 2の空気入りタイヤ (タイヤサイズ: 215Z55R16)をそれぞ れ製作した。従来例の空気入りタイヤは、帯状のウレタンフォーム（幅 150mm X厚さ 20mm)からなる吸音材をゴム系接着剤を用いてトレッド部の内面にタイヤ全周にわ たって固定したものである。実施例 1, 2の空気入りタイヤは、タイヤ内面の全面に熱 可塑性エラストマ一組成物カゝらなる榭脂層を形成する一方で、帯状のウレタンフォー ム（幅 150mm X厚さ 20mm)力もなる吸音材をトレッド部における榭脂層の上にタイ ャ全周にわたって配置し、その吸音材の上にタイヤ周方向に沿って約 200mm間隔 で係止チップを配置し、超音波溶着機を用いて係止チップを榭脂層に対して熱融着 したものである。なお、実施例 1では係止部材の融点と榭脂層の融点との差を約 30 °Cに設定し、実施例 2では係止部材の融点と榭脂層の融点との差を約 5°Cに設定し た。
[0032] これら従来例及び実施例 1, 2の空気入りタイヤについて、ドラム試験機にて内圧 1 50kPa、速度 80kmZhの条件で走行試験を実施し、吸音材に剥離が発生するまで の走行距離を測定した。その結果を表 1に示す。評価結果は、従来例を 100とする指 数にて示した。この指数値が大き!/、ほど耐久性が良好であることを意味する。
[0033] [表 1] 表 1
Figure imgf000011_0001
この表 1から判るように、実施例 1, 2の空気入りタイヤは、従来例に比べて耐久性が 向上していた。特に、実施例 2における耐久性の改善効果が顕著であった。

Claims

請求の範囲
[I] 熱可塑性榭脂又は熱可塑性榭脂中にエラストマ一が分散して ヽる熱可塑性エラス トマ一組成物からなる榭脂層をタイヤ内面の少なくとも一部に形成し、多孔質材料か らなる吸音材を前記榭脂層の上に配置し、熱可塑性榭脂からなる係止部材を前記吸 音材を通して前記榭脂層に対して熱融着した空気入りタイヤ。
[2] 前記係止部材の構成材料が前記榭脂層に含まれる榭脂と同種の熱可塑性榭脂で ある請求項 1に記載の空気入りタイヤ。
[3] 前記係止部材の融点と前記榭脂層の融点との差が 20°C以下である請求項 1に記 載の空気入りタイヤ。
[4] 前記吸音材の多孔質材料が発泡ポリウレタンである請求項 1〜3の 、ずれかに記 載の空気入りタイヤ。
[5] 前記榭脂層を空気透過防止層としてタイヤ内面の全面に形成した請求項 1〜4の
V、ずれかに記載の空気入りタイヤ。
[6] 前記係止部材が板状である請求項 1〜5の 、ずれかに記載の空気入りタイヤ。
[7] 前記係止部材と前記榭脂層との熱融着部をタイヤ周方向に間隔をあけて配置し、 その間隔 Hを前記吸音材の幅 Wに対して 0. 2W≤ H≤ 4Wの関係にした請求項 1〜
6の 、ずれかに記載の空気入りタイヤ。
[8] 熱可塑性榭脂又は熱可塑性榭脂中にエラストマ一を分散させてなる熱可塑性エラ ストマー組成物からなる榭脂層をタイヤ内面の少なくとも一部に備えた空気入りタイヤ を加硫した後、多孔質材料からなる吸音材を前記榭脂層の上に配置し、熱可塑性榭 脂からなる係止部材を前記吸音材を通して前記榭脂層に対して熱融着するようにし た空気入りタイヤの製造方法。
[9] 前記係止部材と前記榭脂層との熱融着に超音波溶着機を用いた請求項 8に記載 の空気入りタイヤの製造方法。
[10] 超音波溶着機の加振用ホーンとして、先端の幅方向両端部に面取りを施した加振 用ホーンを採用した請求項 9に記載の空気入りタイヤの製造方法。
[II] 前記係止部材の構成材料が前記榭脂層に含まれる榭脂と同種の熱可塑性榭脂で ある請求項 8〜 10のいずれかに記載の空気入りタイヤの製造方法。 前記係止部材の融点と前記榭脂層の融点との差が 20°C以下である請求項 8〜： LO の!、ずれかに記載の空気入りタイヤの製造方法。
前記吸音材の多孔質材料が発泡ポリウレタンである請求項 8〜 12のいずれかに記 載の空気入りタイヤの製造方法。
PCT/JP2006/308849 2005-04-28 2006-04-27 空気入りタイヤ及びその製造方法 WO2006118198A1 (ja)

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US8997805B2 (en) 2015-04-07
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