WO2014133105A1 - タイヤ - Google Patents
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- WO2014133105A1 WO2014133105A1 PCT/JP2014/054962 JP2014054962W WO2014133105A1 WO 2014133105 A1 WO2014133105 A1 WO 2014133105A1 JP 2014054962 W JP2014054962 W JP 2014054962W WO 2014133105 A1 WO2014133105 A1 WO 2014133105A1
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- tire
- resin
- rubber
- resin material
- thermoplastic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0041—Compositions of the carcass layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/01—Inflatable pneumatic tyres or inner tubes without substantial cord reinforcement, e.g. cordless tyres, cast tyres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
- C08F255/06—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms on to ethene-propene-diene terpolymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F279/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
- C08F279/02—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 on to polymers of conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
-
- 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
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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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
- C08L31/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid; Compositions of derivatives of such polymers
- C08L31/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C08L31/04—Homopolymers or copolymers of vinyl acetate
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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
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
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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
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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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
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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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
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
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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
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams 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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/02—Carcasses
- B60C9/14—Carcasses built-up with sheets, webs, or films of homogeneous material, e.g. synthetics, sheet metal, rubber
Definitions
- the present invention relates to a tire mounted on a rim, and particularly relates to a tire in which at least a part of a tire case is formed of a resin material.
- pneumatic tires made of rubber, organic fiber materials, steel members, and the like are used for vehicles such as passenger cars.
- Conventional rubber materials conventionally used for pneumatic tires have no problem in heat resistance.
- a plurality of processes such as kneading, sheeting, molding, and vulcanization are usually performed, and improvement in productivity has been demanded.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-104008 discloses a pneumatic tire molded using a thermoplastic polymer material.
- thermoplastic polymer materials thermoplastic resins
- thermoplastic resins have many advantages from the viewpoint of improving productivity, such as being capable of injection molding.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-104008
- Patent Document 2 Japanese Patent Application Publication No. 2006-514141
- thermoplastic resin when used for a tire material, particularly a tire case, the productivity can be significantly improved.
- a thermoplastic resin has a characteristic that it approaches a molten state at a high temperature and rubber elasticity decreases. For this reason, in order to maintain the tire characteristics equivalent to those at room temperature under a high temperature environment, further improvement is required in terms of high temperature permanent distortion.
- performance when manufacturing a tire using a polymer material, it is required to realize performance (required characteristics of a tire) comparable to that of a conventional rubber tire while increasing manufacturing efficiency and realizing low cost.
- the required characteristics of the tire are, for example, required to have an elastic modulus within a certain range and to have low rolling resistance (excellent in low loss).
- low loss and high modulus are usually in a trade-off relationship. For this reason, development of a tire capable of satisfying these characteristics at a high level is desired.
- an object of the present invention is to provide a tire that is formed using a resin material, has excellent high-temperature permanent set properties, is highly elastic, and is excellent in low loss.
- the resin material is (1) at least one selected from polyamide-based thermoplastic resins, polyester-based thermoplastic resins, and polyolefin-based thermoplastic resins.
- a tire comprising a resin composition obtained by dynamically crosslinking a thermoplastic resin and (2) at least one elastomer selected from diene rubber, vinyl acetate copolymer, polyurethane, ethylene propylene rubber, and a mixture thereof.
- the present invention it is possible to provide a tire that is formed using a resin material, has excellent high-temperature permanent set properties, is highly elastic, and is excellent in low-loss properties.
- FIG. 1 is a perspective view showing a partial cross section of a tire according to an embodiment of the present invention. It is sectional drawing of the bead part with which the rim
- the tire of the present invention is formed of at least a resin material and has an annular tire skeleton, and the resin material is selected from (1) a polyamide-based thermoplastic resin, a polyester-based thermoplastic resin, and a polyolefin-based thermoplastic resin.
- At least one thermoplastic resin hereinafter sometimes referred to as “resin component in the present invention”
- at least one thermoplastic resin hereinafter sometimes referred to as “resin component in the present invention”
- diene rubbers hereinafter sometimes referred to as “resin component in the present invention”
- elastomer component in the present invention One type of elastomer (hereinafter sometimes referred to as “the elastomer component in the present invention”) and a dynamically crosslinked resin composition are included.
- the tire skeleton is formed of a resin material containing a resin composition in which the resin component in the present invention and the elastomer component in the present invention are dynamically cross-linked, so that the high temperature permanent strain property is excellent.
- the tire frame of the present invention is formed using a resin material, the tire frame can be formed by injection molding, and thus the productivity is excellent.
- the high-temperature permanent set property of a tire can be determined using a measured value of compression set at 100 ° C. as an index, and the higher the value, the better the high-temperature set property (less residual strain even at high temperatures). ).
- the tire of this invention can implement
- the tire has a tire frame body using a resin material.
- the resin material includes a resin composition in which at least the thermoplastic resin in the present invention and the elastomer component in the present invention are dynamically cross-linked.
- the “resin material” may contain other components such as additives in addition to the resin composition.
- the resin material does not contain any component other than the resin composition, the resin material is composed only of the resin composition.
- “resin” is a concept including a thermoplastic resin and a thermosetting resin, but does not include natural rubber.
- the resin composition can be prepared by dynamically crosslinking a thermoplastic resin (resin component in the present invention) and an elastomer (elastomer component in the present invention).
- dynamic crosslinking means a crosslinking step in which the thermoplastic resin and the elastomer component are crosslinked under high shear conditions.
- the elastomer component is cross-linked to the thermoplastic resin under the high shear condition as described above, the elastomer component is easily dispersed as fine particles in the matrix of the thermoplastic resin during the cross-linking.
- the dynamic cross-linking is carried out at a cross-linking temperature of the mixture or higher in a mixing device such as a roll mill, a Banbury (registered trademark) mixer, a continuous mixer, a kneader or a mixing extruder (for example, a twin screw extruder). This is done by mixing the components.
- a mixing device such as a roll mill, a Banbury (registered trademark) mixer, a continuous mixer, a kneader or a mixing extruder (for example, a twin screw extruder).
- thermoplastic resin in the present invention at least one selected from polyamide-based thermoplastic resins, polyester-based thermoplastic resins, and polyolefin-based thermoplastic resins is used.
- a polyamide-based thermoplastic resin is particularly preferable as the thermoplastic resin.
- polyamide thermoplastic resin-- examples include polyamides obtained by ring-opening polycondensation of ⁇ -caprolactam (nylon 6), polyamides obtained by ring-opening polycondensation of undecane lactam (nylon 11), and polyamides obtained by ring-opening polycondensation of lauryl lactam ( Nylon 12), polycondensation polyamide (nylon 66) of diamine and dibasic acid, or polyamide (nylon MX) having meta-xylenediamine as a structural unit can be exemplified.
- nylon 6 polyamides obtained by ring-opening polycondensation of ⁇ -caprolactam
- nylon 11 polyamides obtained by ring-opening polycondensation of undecane lactam
- lauryl lactam Nylon 12
- polycondensation polyamide (nylon 66) of diamine and dibasic acid or polyamide (nylon MX) having meta-xylenediamine as a structural
- Nylon 46 nylon 610, nylon 612, nylon 6/66 copolymer, nylon 6/66/610 copolymer, nylon MXD6, nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer and the like can also be used.
- the nylon 6 can be represented by, for example, ⁇ CO— (CH 2 ) 5 —NH ⁇ n (n represents the number of repeating units).
- the amide 11 can be represented by, for example, ⁇ CO— (CH 2 ) 10 —NH ⁇ n (n represents the number of repeating units).
- the amide 12 can be represented by, for example, ⁇ CO— (CH 2 ) 11 —NH ⁇ n (n represents the number of repeating units).
- the nylon 66 can be represented by, for example, ⁇ CO (CH 2 ) 4 CONH (CH 2 ) 6 NH ⁇ n (n represents the number of repeating units).
- the amide MX having meta-xylenediamine as a structural unit can be represented by, for example, the following structural unit (A-1) [in (A-1), n represents the number of repeating units].
- the polyamide-based thermoplastic resin may be a homopolymer composed only of the structural unit, or may be a copolymer of the structural unit (A-1) and another monomer.
- the content of the structural unit (A-1) in each polyamide-based thermoplastic resin is preferably 60% by mass or more.
- the number average molecular weight of the polyamide-based thermoplastic resin is preferably 300 to 30000.
- the number average molecular weight of the polymer constituting the soft segment is preferably 200 to 20000 from the viewpoint of toughness and low temperature flexibility.
- a commercial product may be used as the polyamide-based thermoplastic resin.
- nylon 6 for example, “UBE nylon” 1022B, 1011FB manufactured by Ube Industries, Ltd., etc. can be used.
- amide 12 “UBE nylon” manufactured by Ube Industries, for example, 3024U can be used.
- nylon 66 “UBE nylon” or the like can be used.
- amide MX for example, commercially available MX nylon (S6001, S6021, S6011) manufactured by Mitsubishi Gas Chemical Co., Inc. can be used.
- polyamide-based thermoplastic resin those having a softening point lower than 275 ° C. are preferable, and a linear crystalline polyamide having a softening point or a melting point of 160 to 230 ° C. is particularly preferable.
- polyamide-based thermoplastic resins are described in Kirk-Othmer, Encyclopedia of Polymer Science and Technology, Vol. 10, pages 392 to 414 and Encyclopedia of Polymer Science, Technology pages 10, 14 to 392.
- Examples of the nylon resin having a melting point of 160 to 230 ° C. include nylon 6, nylon 11, nylon 12, nylon 6/66 copolymer, nylon 610 and nylon 612.
- the melting point of the nylon resin is less than 160 ° C., the resin composition may melt or be inferior in handleability such as during dynamic crosslinking. On the other hand, if the melting point exceeds 230 ° C., the Young's modulus of the resin composition may become too large.
- polyester thermoplastic resin-- The polyester-based thermoplastic resin is a resin having an ester bond in the main chain.
- the polyester thermoplastic resin is not particularly limited, and may be crystalline or amorphous, and examples thereof include aliphatic polyesters and aromatic polyesters.
- the aliphatic polyester may be a saturated aliphatic polyester or an unsaturated aliphatic polyester.
- the aromatic polyester is usually crystalline, and can be formed from, for example, an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic diol.
- the aromatic polyester include polybutylene terephthalate, polyethylene terephthalate, polyethylene isophthalate, polybutylene terephthalate / tetramethylene glycol copolymer, polyethylene terephthalate / polyethylene isophthalate copolymer, polyarylate, polybutylene naphthalate, and liquid crystal polyester.
- aromatic polyesters such as polyoxyalkylene diimide diacid / polybutylene terephthalate copolymer.
- one of the aromatic polyesters includes terephthalic acid and / or polybutylene terephthalate derived from dimethyl terephthalate and 1,4-butanediol, and further includes isophthalic acid, phthalic acid, naphthalene-2, Dicarboxylic acid components such as 6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sulfoisophthalic acid, or ester-forming derivatives thereof; Diols having a molecular weight of 300 or less [for example, aliphatic diols such as ethylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentyl glycol, decamethylene glycol, 1,4-cyclohexanedimethanol, tricyclodeca Alicyclic diols such as di
- polyester-based thermoplastic resin for example, “Duranex” series (for example, 2000, 2002, etc.) manufactured by Polyplastics Co., Ltd., Novaduran manufactured by Mitsubishi Engineering Plastics Co., Ltd. Series (for example, 5010R5, 5010R3-2, etc.), “Toraycon” series (for example, 1401X06, 1401X31, etc.) manufactured by Toray Industries, Inc. can be mentioned.
- any of a dicarboxylic acid / diol condensation system and a hydroxycarboxylic acid condensation system can be used.
- examples thereof include polylactic acid, polyhydroxy-3-butylbutyric acid, polyhydroxy-3-hexylbutyric acid, poly ( ⁇ -caprolactone), polyenanthlactone, polycaprylolactone, polybutylene adipate, polyethylene adipate, and the like.
- the Vicat softening temperature (Method A) defined in JIS K7206 for thermoplastic resin materials containing polyester-based thermoplastic resin is preferably 130 ° C. or higher, preferably 130 to 250 ° C., more preferably 130 to 220 ° C.
- the softening temperature (Method A) of the thermoplastic resin material is 130 ° C. or higher, the softening and deformation of the tire in the use environment can be suppressed.
- deformation of the tire frame body can be suppressed.
- polyolefin thermoplastic resin-- examples of the polyolefin-based thermoplastic resin include ⁇ -olefins such as propylene and ethylene, cyclic olefin homopolymers such as cycloolefin, random copolymers, and block copolymers. Specific examples include polyethylene-based thermoplastic resins, polypropylene-based thermoplastic resins, polybutadiene-based thermoplastic resins, and polypropylene-based thermoplastic resins are particularly preferable from the viewpoint of heat resistance and processability.
- polypropylene-based thermoplastic resin examples include a propylene homopolymer, a propylene- ⁇ -olefin random copolymer, a propylene- ⁇ -olefin block copolymer, and the like.
- Examples of the ⁇ -olefin include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-heptene, Examples thereof include ⁇ -olefins having about 3 to 20 carbon atoms such as 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene and 1-eicocene.
- the polyolefin-based thermoplastic resin may be a chlorinated polyolefin-based resin in which some or all of the hydrogen atoms in the molecule are replaced with chlorine atoms.
- Examples of the chlorinated polyolefin resin include chlorinated polyethylene resins.
- the melting point of the polyolefin-based thermoplastic resin is usually 80 ° C. to 200 ° C., and preferably about 100 ° C. to 200 ° C. from the viewpoint of tire productivity.
- a thermoplastic resin material including a polyolefin-based thermoplastic resin having a melting point of 100 ° C. to 200 ° C. is used, for example, a tire skeleton is formed by fusing the divided bodies (frame pieces).
- the heating temperature of the joint can be set to be equal to or higher than the melting point of the thermoplastic resin material forming the tire skeleton.
- the tire of the present invention uses a thermoplastic resin material containing a polyolefin-based thermoplastic resin to improve the bond strength between tire skeleton pieces even in a skeleton fused at a temperature range of 100 to 200 ° C. It is possible to improve durability during traveling such as puncture resistance and wear resistance.
- the heating temperature is preferably 10 to 150 ° C. higher than the melting point of the thermoplastic resin material containing the polyolefin-based thermoplastic elastomer forming the tire frame piece, and more preferably 10 to 100 ° C. higher.
- the elastomer component in the present invention that is dynamically cross-linked to the thermoplastic resin in the present invention includes diene rubber, vinyl acetate copolymer, polyurethane, ethylene propylene rubber, and a mixture thereof.
- the elastomer component of the present invention also includes modified products of the diene rubber, the vinyl acetate copolymer, the polyurethane, and the ethylene propylene rubber.
- diene rubber examples include diene rubber and hydrogenated products thereof (for example, natural rubber, isoprene rubber, epoxidized natural rubber, styrene butadiene rubber, butadiene rubber (high cis BR and low cis BR), acrylonitrile butadiene rubber, hydrogen Modified acrylonitrile butadiene rubber, hydrogenated styrene butadiene rubber) and diene rubbers.
- the diene rubber does not include butyl rubber (IIR).
- carboxyl group-containing styrene butadiene rubber such as styrene butadiene rubber and maleic acid modified styrene butadiene rubber, emulsion polymerization styrene butadiene rubber, butadiene rubber, isoprene rubber or natural rubber is preferable.
- the vinyl acetate copolymer include ethylene vinyl acetate copolymers (for example, “Ultrasen” series manufactured by Tosoh Corporation) and modified products thereof.
- the ethylene propylene rubber includes a rubbery copolymer (EPDM) of ethylene, propylene and a diene compound, or a rubbery copolymer (EPM) of ethylene and propylene, and a modified product thereof (maleic acid modified). Ethylene propylene rubber). Since EPDM or EPM has a melting property close to that of a resin and a vulcanization site due to a double bond, it is suitable for performing sulfur crosslinking. Examples of the modified ethylene propylene rubber include maleic acid-modified EPDM. By making it acid-modified, the affinity with the basic polyamide is increased and it becomes easy to finely disperse. The maleic acid-modified EPDM can be obtained by treating EPDM with maleic anhydride.
- polyurethane-based thermoplastic elastomer As the polyurethane, a polyurethane-based thermoplastic elastomer can be used.
- Polyurethane-based thermoplastic elastomers consist of hard segments in which at least polyurethane forms pseudo-crosslinks due to physical aggregation, and other polymers are amorphous and have soft segments with low glass transition temperatures. Can be mentioned.
- the number average molecular weight of the polymer (polyurethane) constituting the hard segment is preferably 300 to 1500 from the viewpoint of melt moldability.
- the number average molecular weight of the polymer constituting the soft segment is preferably 500 to 20000, more preferably 500 to 5000, and particularly preferably 500 to 5000, from the viewpoint of flexibility and thermal stability of the polyurethane-based thermoplastic elastomer. 3000.
- the mass ratio (x: y) to the hard segment (x) and the soft segment (y) is preferably 15:85 to 90:10, more preferably 30:70 to 90:10, from the viewpoint of moldability. preferable.
- the polyurethane-based thermoplastic elastomer can be synthesized by copolymerizing the polymer that forms the hard segment and the polymer that forms the soft segment by a known method.
- the polyurethane-based thermoplastic elastomer for example, thermoplastic polyurethane described in JP-A-5-331256 can be used.
- the polyurethane-based thermoplastic elastomer specifically, a combination of a hard segment composed of an aromatic diol and an aromatic diisocyanate and a soft segment composed of a polycarbonate is preferable.
- polyurethane-based thermoplastic elastomer examples include, for example, commercially available “Elastollan” series (for example, ET680, ET880, ET690, ET890, etc.) manufactured by BASF, and “Clamiron U” series (manufactured by Kuraray Co., Ltd.).
- “Elastollan” series for example, ET680, ET880, ET690, ET890, etc.
- Clamiron U manufactured by Kuraray Co., Ltd.
- “Milactolan” series for example, XN-2001, XN-2004, P390RSUP, P480RSUI, P26MRNAT, E490, E590, P890 manufactured by Japan Miraclan Co., Ltd. Can be used.
- the elastomer component in the present invention ethylene propylene rubber is preferable, and maleic acid-modified EPDM is more preferable.
- the combination of the resin component in the present invention and the elastomer component in the present invention is preferably a combination of an amide thermoplastic resin and ethylene propylene rubber, and more preferably a combination of an amide thermoplastic resin and maleic acid-modified EPDM.
- the elastomer components may be used alone or in combination as a mixture. In particular, diene rubber components can be used in combination as desired.
- Examples of such combinations include emulsion polymerization SBR and isoprene rubber, carboxyl group-containing SBR and isoprene rubber, EPDM and maleic acid-modified EPDM, A combination of natural rubber and isoprene rubber, a combination of isoprene rubber and EPDM, and the like.
- thermoplastic resin a polymer having an affinity for the polyamide-based thermoplastic resin can be used in combination.
- a modifying polymer having a functional group having reactivity with the polyamide resin and other thermoplastic resins can also be used.
- Examples of the modifying polymer having a functional group having reactivity with the polyamide resin include the modifying polymers described in JP-T-2010-516835.
- the thermoplastic resin is a polyamide-based thermoplastic resin such as nylon 6, nylon 66, nylon 6,66, nylon 612, nylon 11, nylon 12, nylon 46, nylon 6,66,610, nylon MXD6, etc.
- functional groups having reactivity with these polyamide-based thermoplastic resins include acid anhydride groups, epoxy groups, halogen groups, carboxyl groups, amino groups, hydroxyl groups, and other functional groups. Physical groups such as maleic anhydride groups are preferred.
- the modifying polymer a polymer having the reactive functional group can be used.
- the modifying polymer having an anhydride group may include an olefin homopolymer or copolymer. A copolymer of ethylene and at least one ⁇ -olefin selected from propylene, butene, hexene and octene is particularly preferred from the viewpoint of elongation at break and strength at break.
- the tensile stress at break is 30 to 70% of the polyamide resin, and the tensile elongation at break is 100 to 500% (both at ⁇ 20 ° C. according to JIS K6251). It is preferable to use one having a measured one).
- a compatibilizing agent for the thermoplastic resin and the elastomer component in the present invention can also be used for the resin material.
- the compatibilizer may have a function of bringing the surface energy between layers close to each other, or may have a reactive functional group.
- a reactive group a carbonyl group, a halogen group, a hydroxyl group, an amino group, an epoxy group, or the like is preferably used.
- the main compatibilizers include maleic acid-modified polyolefins, polymers obtained by graft polymerizing acrylic acid or glycidyl methacrylate to polyolefins, block copolymers of polyolefin and nylon, and maleic acid of styrene-ethylene-butadiene-styrene copolymer Examples include modified products.
- additives such as rubber, various fillers (for example, silica, calcium carbonate, clay), anti-aging agents, oils, plasticizers, colorants, weathering agents, and reinforcing materials are added to the resin material as desired. You may make it contain.
- the content of the additive in the resin material (tire frame) is not particularly limited, and can be appropriately used as long as the effects of the present invention are not impaired.
- the content of the resin component in the resin material is preferably 50% by mass or more, and more preferably 90% by mass or more based on the total amount of the resin material.
- the content of the resin component in the resin material is the balance obtained by subtracting the total content of various additives from the total amount of the resin component.
- anti-aging agent examples include anti-aging agents described in International Publication No. WO2005 / 063482. Specifically, for example, naphthylamines such as phenyl-2-naphthylamine and phenyl-1-naphthylamine, 4,4′- ⁇ , ⁇ -dimethylbenzyl) diphenylamine, p- (P-toluene sulfonylamide) -diphenylamine, etc.
- naphthylamines such as phenyl-2-naphthylamine and phenyl-1-naphthylamine, 4,4′- ⁇ , ⁇ -dimethylbenzyl) diphenylamine, p- (P-toluene sulfonylamide) -diphenylamine, etc.
- Amine-based anti-aging agents such as diphenylamine, N, N′-diphenyl-p-phenylenediamine, N-isopropyl-N′-phenyl-p-phenylenediamine, etc., derivatives or mixtures thereof Is mentioned.
- the triphosphite anti-aging agent, the hindered phenol anti-aging agent alone or an anti-aging agent combined with other anti-aging agents is preferably 5 phr (ie, parts by mass per 100 parts by mass of rubber), more preferably 4 phr.
- still more preferably 3 phr or less, still more preferably 2 phr or less, most preferably 1 phr or less can be used.
- triphosphite antioxidant examples include tris (di-tert-butylphenyl) phosphite and tris-nonylphenyl phosphite, and typical examples of hindered phenol antioxidants are 4,4′-butylidenebis- (3-methyl-6-tert-butylphenol), 2,4-bis [(octylthio) methyl] -o-cresol.
- the resin composition is prepared by dynamically crosslinking the thermoplastic resin in the present invention and the elastomer in the present invention.
- the blending ratio of the thermoplastic resin (resin component) in the resin composition to the elastomer (elastomer component) in the present invention is such that the content of the thermoplastic resin is 40 to 40 parts by mass with respect to 100 parts by mass of the total amount of the elastomer.
- the amount is preferably 500 parts by mass, and more preferably 50 to 450 parts by mass.
- the elastomer component in the present invention with respect to a sea phase (also referred to as a continuous phase or a matrix phase) composed of the thermoplastic resin (resin component).
- Tends to form a so-called sea-island structure that becomes an island phase also referred to as a discontinuous phase, a dispersed layer or a domain).
- the size of the island phase containing the elastomer component (the major axis of the island phase) is preferably about 0.4 ⁇ m to 10.0 ⁇ m, more preferably about 0.5 ⁇ m to 7 ⁇ m. It is particularly preferably about 5 ⁇ m to 5 ⁇ m.
- the size of each phase can be measured using an observation photograph using SEM.
- the elastomer and a predetermined crosslinking agent are kneaded in advance using a general kneader, a Banbury mixer, or the like until a uniform mixed state is obtained.
- a filler such as carbon, oil, or calcium carbonate may be added to the elastomer component.
- the temperature is kept at a low temperature of 120 ° C. or less.
- thermoplastic resin (resin component) obtained from the above are put into a twin-screw kneader or the like, and the rubber component is dynamically cross-linked while melt kneading to obtain a continuous phase (matrix).
- the elastomer component is dispersed as a dispersed phase (domain) in the thermoplastic resin forming the phase.
- Additives to thermoplastic resins and elastomers may be added during the kneading, or may be mixed in advance before kneading.
- the kneader used for the kneading is not particularly limited, and a screw extruder, a kneader, a Banbury mixer, a biaxial kneading extruder, or the like can be used. Among these, it is preferable to use a twin-screw kneading extruder for kneading the thermoplastic resin and the elastomer and for dynamic crosslinking thereof. Furthermore, a plurality of kneaders may be used and kneaded sequentially. As conditions for the melt kneading, the temperature may be equal to or higher than a temperature at which a predetermined nylon resin melts. The shear rate during kneading is preferably 500 to 7500 sec ⁇ 1 . The total kneading time is preferably about 30 seconds to 10 minutes.
- the resin composition obtained from the above has a so-called sea-island structure in which an elastomer that forms a discontinuous phase is dispersed as a dispersed phase (domain) in a matrix of a thermoplastic resin that forms a continuous phase.
- the vulcanizing agent crosslinking agent
- vulcanization aid vulcanization aid
- vulcanization conditions temperature, time, etc. in the case of dynamic vulcanization may be appropriately determined according to the composition of the elastomer to be added, and are particularly limited. Is not to be done.
- a crosslinking agent (vulcanizing agent) used for dynamic crosslinking a general rubber vulcanizing agent (crosslinking agent) can be used.
- sulfur vulcanizing agents include powdered sulfur, precipitated sulfur, highly dispersible sulfur, surface-treated sulfur, insoluble sulfur, dimorpholine disulfide, alkylphenol disulfide, and the like. About 4 phr (parts by mass per 100 parts by mass of the elastomer component) can be used.
- Organic peroxide vulcanizing agents include benzoyl peroxide, t-butyl hydroperoxide, 2,4-dichlorobenzoyl peroxide, 2,5-dimethyl-2,5-di (t-butyl).
- Peroxy) hexane, 2,5-dimethylhexane-2,5-di (peroxylbenzoate) and the like are exemplified, and for example, about 1 to 20 phr can be used.
- examples of the phenol resin vulcanizing agent include bromides of alkyl phenol resins, mixed crosslinking systems containing halogen donors such as tin chloride and chloroprene, and alkyl phenol resins. For example, about 1 to 20 phr is used. Can do.
- zinc white about 5 phr
- magnesium oxide about 4 phr
- risurge about 10 to 20 phr
- p-quinonedioxime p-dibenzoylquinonedioxime
- tetrachloro-p-benzoquinone poly-p- Examples
- dinitrosobenzene about 2 to 10 phr
- methylenedianiline about 0.2 to 10 phr
- vulcanization accelerator general vulcanization accelerators such as aldehyde / ammonia system, guanidine system, thiazole system, sulfenamide system, thiuram system, dithioate system, thiourea system, etc. are used, for example, 0.5 to 2 phr. Can be used.
- the tire frame in the present invention uses the above-mentioned resin material.
- the melting point (or softening point) of the resin material (tire frame) itself is usually 100 ° C. to 350 ° C., preferably about 100 ° C. to 250 ° C., but from the viewpoint of tire productivity, 120 ° C. to 250 ° C. C. is preferably about 120.degree. C., more preferably 120.degree. In this way, by using a resin material having a melting point of 120 ° C. to 250 ° C., for example, when a tire skeleton is formed by fusing the divided bodies (frame pieces), the periphery of 120 ° C. to 250 ° C. Even if the frame body is fused in the temperature range, the bonding strength between the tire frame pieces is sufficient.
- the heating temperature is preferably 10 ° C to 150 ° C higher than the melting point (or softening point) of the resin material forming the tire frame piece, and more preferably 10 ° C to 100 ° C higher.
- the resin material can be obtained by adding various additives as necessary and mixing them appropriately by a known method (for example, melt mixing).
- the resin material obtained by melt mixing can be used in the form of pellets if necessary.
- the tensile yield strength defined in JIS K7113: 1995 of the resin material (tire frame) itself is preferably 5 MPa or more, preferably 5 MPa to 20 MPa, and more preferably 5 MPa to 17 MPa.
- the resin material can withstand deformation against a load applied to the tire during traveling.
- the tensile yield elongation defined by JIS K7113: 1995 of the resin material (tire frame) itself is preferably 10% or more, preferably 10% to 70%, and more preferably 15% to 60%.
- the tensile yield elongation of the resin material is 10% or more, the elastic region is large, and the rim assembly property can be improved.
- the tensile elongation at break specified in JIS K7113: 1995 of the resin material (tire frame) itself is preferably 50% or more, preferably 100% or more, more preferably 150% or more, and particularly preferably 200% or more.
- the rim assembly property is good and it is possible to make it difficult to break against a collision.
- the deflection temperature under load (when loaded with 0.45 MPa) as defined in ISO 75-2 or ASTM D648 of the resin material (tire frame) itself is preferably 50 ° C. or more, preferably 50 ° C. to 150 ° C., and preferably 50 ° C. to 50 ° C. 130 ° C. is more preferable.
- the deflection temperature under load of the resin material is 50 ° C. or higher, deformation of the tire skeleton can be suppressed even when vulcanization is performed in the manufacture of the tire.
- FIG. 1A is a perspective view showing a partial cross section of a tire according to an embodiment of the present invention.
- FIG. 1B is a cross-sectional view of a bead portion attached to a rim.
- the tire 10 of the present embodiment has a cross-sectional shape that is substantially the same as a conventional general rubber pneumatic tire.
- the tire 10 As shown in FIG. 1A, the tire 10, the side portion 14 of the bead seat 21 and the bead portions 12 of the pair in contact with the rim flange 22 of the rim 20, extends from the bead portion 12 outward in the tire radial direction shown in FIG. 1 B
- a tire case 17 including a crown portion 16 (outer peripheral portion) that connects a tire radial direction outer end of one side portion 14 and a tire radial direction outer end of the other side portion 14.
- the tire case 17 of the present embodiment contains, for example, nylon 6 (resin component in the present invention) and maleic acid-modified EPDM (elastomer component in the present invention) in a ratio of 2: 1 as a resin material.
- a resin composition in which an elastomer component is dynamically cross-linked can be used including each additive.
- the tire case 17 is formed of a single resin material.
- the present invention is not limited to this configuration, and each part of the tire case 17 is similar to a conventional general rubber pneumatic tire.
- a reinforcing material (polymer material, metal fiber, cord, nonwoven fabric, woven fabric, etc.) is embedded in the tire case 17 (for example, the bead portion 12, the side portion 14, the crown portion 16 and the like), and the reinforcing material is provided.
- the tire case 17 may be reinforced.
- the tire frame body in the present invention is formed of a single resin material, but the tire frame body is configured by combining a plurality of materials for the crown part, the side part, etc. of the tire frame body in the present invention. You can also.
- the resin material according to the present invention at least in the side portion of the tire skeleton, a tire satisfying high elastic modulus and body loss can be provided.
- the thickness of the crown portion of the tire frame body can be appropriately selected in order to adjust the bending elastic modulus.
- 0.5 mm to 10 mm is preferable, and 1 mm to 5 mm is preferable. Further preferred is 1 mm to 4 mm.
- the thickness of the side portion of the tire frame is more preferably 0.5 mm to 10 mm, and particularly preferably 1 mm to 5 mm.
- the thickness of the crown part and side part of these tire frame bodies it can be based on the average thickness of the test piece at the time of measuring the above-mentioned bending elastic modulus.
- the tire case 17 of the present embodiment is obtained by joining a pair of tire case halves (tire frame pieces) 17A formed of a resin material.
- the tire case half 17A is formed by injection molding or the like so that one bead portion 12, one side portion 14, and a half-width crown portion 16 are integrated with each other so as to face each other. It is formed by joining at the tire equator part.
- the tire case 17 is not limited to the one formed by joining two members, and may be formed by joining three or more members.
- the tire case half 17A formed of the resin material can be formed by, for example, vacuum forming, pressure forming, injection molding, melt casting, or the like. For this reason, it is not necessary to perform vulcanization compared to the case where the tire case is molded with rubber as in the prior art, the manufacturing process can be greatly simplified, and the molding time can be omitted.
- the tire case half body 17A has a symmetrical shape, that is, the one tire case half body 17A and the other tire case half body 17A have the same shape. There is also an advantage that only one type of mold is required.
- an annular bead core 18 made of a steel cord is embedded in the bead portion 12, similar to a conventional general pneumatic tire.
- the present invention is not limited to this configuration, and the bead core 18 can be omitted if the rigidity of the bead portion 12 is ensured and there is no problem in fitting with the rim 20.
- an organic fiber cord, a resin-coated organic fiber cord, or a hard resin may be used.
- An annular seal layer 24 made of is formed.
- the seal layer 24 may also be formed at a portion where the tire case 17 (bead portion 12) and the bead sheet 21 are in contact with each other.
- a material having better sealing properties than the resin material constituting the tire case 17 a softer material than the resin material constituting the tire case 17 can be used.
- the rubber that can be used for the seal layer 24 it is preferable to use the same type of rubber as that used on the outer surface of the bead portion of a conventional general rubber pneumatic tire. Further, if the sealing property between the rim 20 can be ensured only by the resin material forming the tire case 17, the rubber seal layer 24 may be omitted, and other thermoplastic resins having better sealing properties than the resin material. (Thermoplastic elastomer) may be used. Examples of such other thermoplastic resins include polyurethane resins, polyolefin resins, polystyrene thermoplastic resins, polyester resins, and the like, and blends of these resins with rubbers or elastomers.
- thermoplastic resins include polyurethane resins, polyolefin resins, polystyrene thermoplastic resins, polyester resins, and the like, and blends of these resins with rubbers or elastomers.
- Thermoplastic elastomers can also be used, for example, polyester-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polystyrene-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, or combinations of these elastomers or blends with rubber. Thing etc. are mentioned.
- a reinforcement cord 26 having higher rigidity than the resin material constituting the tire case 17 is wound around the crown portion 16 in the circumferential direction of the tire case 17.
- the reinforcing cord 26 is wound spirally in a state in which at least a part thereof is embedded in the crown portion 16 in a cross-sectional view along the axial direction of the tire case 17, thereby forming a reinforcing cord layer 28.
- FIG. 2 is a cross-sectional view along the tire rotation axis showing a state where a reinforcing cord is embedded in the crown portion of the tire case of the tire of the first embodiment.
- the reinforcing cord 26 is spirally wound in a state in which at least a part is embedded in the crown portion 16 in a sectional view along the axial direction of the tire case 17.
- a reinforcing cord layer 28 indicated by a broken line portion in FIG. 2 is formed together with a part of the outer peripheral portion 17.
- the portion embedded in the crown portion 16 of the reinforcing cord 26 is in close contact with the resin material constituting the crown portion 16 (tire case 17).
- a monofilament such as a metal fiber or an organic fiber, or a multifilament (twisted wire) obtained by twisting these fibers such as a steel cord twisted with a steel fiber
- a steel cord is used as the reinforcing cord 26.
- the burying amount L indicates the burying amount of the reinforcing cord 26 in the tire rotation axis direction with respect to the tire case 17 (crown portion 16).
- the embedding amount L of the reinforcing cord 26 in the crown portion 16 is preferably 1/5 or more of the diameter D of the reinforcing cord 26, and more preferably more than 1/2. Most preferably, the entire reinforcing cord 26 is embedded in the crown portion 16. When the embedment amount L of the reinforcing cord 26 exceeds 1/2 of the diameter D of the reinforcing cord 26, it is difficult to jump out of the embedded portion due to the size of the reinforcing cord 26.
- the reinforcing cord layer 28 corresponds to a belt disposed on the outer peripheral surface of the carcass of a conventional rubber pneumatic tire.
- the crown 30 is disposed on the outer peripheral side of the reinforcing cord layer 28 in the tire radial direction.
- the rubber used for the crown 30 is preferably the same type of rubber used in conventional rubber pneumatic tires.
- a crown formed of another type of resin material that is more excellent in wear resistance than the resin material constituting the tire case 17 may be used.
- the crown 30 is formed with a crown pattern including a plurality of grooves on the ground contact surface with the road surface in the same manner as a conventional rubber pneumatic tire.
- the manufacturing method of the tire of this embodiment is explained.
- a tire case half is formed using a resin material including a resin composition obtained by dynamically crosslinking nylon 6 and maleic acid-modified EPDM as described above. These tire cases are preferably formed by injection molding.
- the tire case halves supported by the thin metal support ring face each other.
- a joining mold (not shown) is installed so as to be in contact with the outer peripheral surface of the abutting portion of the tire case half.
- die is comprised so that the periphery of the junction part (butting part) of the tire case half body 17A may be pressed with a predetermined pressure.
- the periphery of the joint portion of the tire case half is pressed at a temperature equal to or higher than the melting point (or softening point) of the resin material constituting the tire case.
- the joining portion of the tire case half is heated and pressurized by the joining mold, the joining portion is melted and the tire case halves are fused together, and the tire case 17 is formed by integrating these members.
- the joining portion of the tire case half is heated using a joining mold, but the present invention is not limited to this.
- the joining portion is heated by a separately provided high-frequency heater or the like. Or softened or melted beforehand by hot air, infrared irradiation, etc., and pressed by a joining mold.
- the tire case halves may be joined.
- FIG. 3 is an explanatory diagram for explaining an operation of embedding a reinforcing cord in a crown portion of a tire case using a cord heating device and rollers.
- the cord supply device 56 is disposed on the reel 58 around which the reinforcing cord 26 is wound, the cord heating device 59 disposed on the downstream side of the reel 58 in the cord transport direction, and the downstream side of the reinforcing cord 26 in the transport direction.
- the first roller 60, the first cylinder device 62 that moves the first roller 60 in the direction of contacting and separating from the outer peripheral surface of the tire, and the downstream side in the conveying direction of the reinforcing cord 26 of the first roller 60 A second roller 64, and a second cylinder device 66 that moves the second roller 64 in a direction in which the second roller 64 comes in contact with and separates from the tire outer peripheral surface.
- the second roller 64 can be used as a metal cooling roller.
- the surface of the first roller 60 or the second roller 64 is made of fluororesin (in this embodiment, Teflon (registered trademark)) in order to suppress adhesion of a molten or softened resin material. It is coated.
- the cord supply device 56 includes two rollers, the first roller 60 and the second roller 64, but the present invention is not limited to this configuration, and any one of the rollers. It is also possible to have only one (that is, one roller).
- the cord heating device 59 includes a heater 70 and a fan 72 that generate hot air. Further, the cord heating device 59 includes a heating box 74 through which the reinforcing cord 26 passes through an internal space in which hot air is supplied, and a discharge port 76 for discharging the heated reinforcing cord 26.
- the temperature of the heater 70 of the cord heating device 59 is raised, and the ambient air heated by the heater 70 is sent to the heating box 74 by the wind generated by the rotation of the fan 72.
- the reinforcing cord 26 unwound from the reel 58 is fed into a heating box 74 in which the internal space is heated with hot air (for example, the temperature of the reinforcing cord 26 is heated to about 100 to 200 ° C.).
- the heated reinforcing cord 26 passes through the discharge port 76 and is wound spirally around the outer peripheral surface of the crown portion 16 of the tire case 17 rotating in the direction of arrow R in FIG.
- the resin material at the contact portion melts or softens, and at least a part of the heated reinforcing cord 26 is embedded in the outer peripheral surface of the crown portion 16. Is done. At this time, since the heated reinforcing cord 26 is embedded in the molten or softened resin material, there is no gap between the resin material and the reinforcing cord 26, that is, a tight contact state. Thereby, the air entering to the portion where the reinforcing cord 26 is embedded is suppressed.
- the burying amount L of the reinforcing cord 26 can be adjusted by the heating temperature of the reinforcing cord 26, the tension applied to the reinforcing cord 26, the pressing force by the first roller 60, and the like.
- the embedding amount L of the reinforcing cord 26 is set to be 1/5 or more of the diameter D of the reinforcing cord 26.
- the burying amount L of the reinforcing cord 26 is more preferably more than 1/2 of the diameter D, and most preferably the entire reinforcing cord 26 is embedded.
- the reinforcing cord layer 28 is formed on the outer peripheral side of the crown portion 16 of the tire case 17 by winding the heated reinforcing cord 26 while being embedded in the outer peripheral surface of the crown portion 16.
- the vulcanized belt-shaped crown 30 is wound around the outer peripheral surface of the tire case 17 by one turn, and the crown 30 is bonded to the outer peripheral surface of the tire case 17 using an adhesive or the like.
- the crown 30 may be, for example, a precure crown that is used in conventionally known retreaded tires. This step is the same step as the step of bonding the precure crown to the outer peripheral surface of the base tire of the retreaded tire.
- the seal layer 24 made of vulcanized rubber is bonded to the bead portion 12 of the tire case 17 using an adhesive or the like, the tire 10 is completed.
- the tire case 17 is formed of a resin material including a resin composition in which the thermoplastic resin in the present invention and the elastomer component in the present invention are dynamically cross-linked. Excellent low loss properties can be achieved while having a high elastic modulus.
- the tire 10 is light in weight because it has a simple structure as compared with a conventional rubber tire. For this reason, the tire 10 of this embodiment has high friction resistance and durability. Further, since the tire case 17 can be injection-molded, the productivity is very excellent.
- a reinforcing cord 26 having a rigidity higher than that of the resin material is spirally wound in the circumferential direction on the outer peripheral surface of the crown portion 16 of the tire case 17 formed of a resin material. Therefore, puncture resistance, cut resistance, and circumferential rigidity of the tire 10 are improved. In addition, creep of the tire case 17 formed of a resin material is prevented by improving the circumferential rigidity of the tire 10.
- the reinforcing cord 26 is embedded in the outer peripheral surface of the crown portion 16 of the tire case 17 made of a resin material in a cross-sectional view along the axial direction of the tire case 17 (cross section shown in FIG. 1).
- the reinforcing cord 26 since it is in close contact with the resin material, entry of air at the time of manufacture is suppressed, and movement of the reinforcing cord 26 due to input during travel is suppressed. Thereby, it is suppressed that peeling etc. arise in the reinforcement cord 26, the tire case 17, and the crown 30, and the durability of the tire 10 is improved.
- the reinforcing cord layer 28 is configured to include a resin material in this way, the difference in hardness between the tire case 17 and the reinforcing cord layer 28 is reduced as compared with the case where the reinforcing cord 26 is fixed with cushion rubber. Therefore, the reinforcing cord 26 can be further adhered and fixed to the tire case 17. Thereby, the above-mentioned air entering can be prevented effectively, and it can control effectively that a reinforcement cord member moves at the time of driving. Furthermore, when the reinforcing cord 26 is a steel cord, the reinforcing cord 26 can be easily separated and collected from the resin material by heating at the time of disposal of the tire, which is advantageous in terms of recyclability of the tire 10.
- the resin material has a lower loss coefficient (tan ⁇ ) than vulcanized rubber, if the reinforcing cord layer 28 contains a large amount of the resin material, the rolling property of the tire can be improved. Furthermore, the resin material has an advantage that the in-plane shear rigidity is larger than that of the vulcanized rubber, and the handling property and wear resistance during running of the tire are excellent.
- the embedding amount L of the reinforcement cord 26 is 1/5 or more of the diameter D as shown in FIG. 2, the air entry at the time of manufacture is suppressed effectively, the input at the time of driving, etc. This further suppresses the movement of the reinforcing cord 26.
- the crown 30 in contact with the road surface is made of a rubber material that is more resistant to wear than the resin material constituting the tire case 17, the wear resistance of the tire 10 is improved. Further, since an annular bead core 18 made of a metal material is embedded in the bead portion 12, the tire case 17, that is, the tire 10 is strong against the rim 20 like the conventional rubber pneumatic tire. Retained.
- a seal layer 24 made of a rubber material having a sealing property than the resin material constituting the tire case 17 is provided at a portion of the bead portion 12 that contacts the rim 20, the tire 10 and the rim 20 The sealing performance between the two is improved. For this reason, compared with the case where it seals only with the rim
- the reinforcing cord 26 is heated and the surface of the tire case 17 where the heated reinforcing cord 26 contacts is melted or softened.
- the present invention is not limited to this configuration, and the reinforcing cord is used. It is also possible to use a hot air generating device without heating 26 and heat the outer peripheral surface of the crown portion 16 in which the reinforcing cord 26 is embedded, and then embed the reinforcing cord 26 in the crown portion 16.
- the heat source of the cord heating device 59 is a heater and a fan.
- the present invention is not limited to this configuration, and the reinforcement cord 26 may be directly heated by radiant heat (for example, infrared rays). Good.
- the portion in which the resin material in which the reinforcing cord 26 is embedded is melted or softened is forcibly cooled by the metal second roller 64, but the present invention is limited to this configuration.
- a configuration may be adopted in which cold air is directly blown onto a portion where the resin material is melted or softened to forcibly cool and solidify the melted or softened portion of the resin material.
- the reinforcing cord 26 is heated.
- the outer periphery of the reinforcing cord 26 may be covered with the same resin material as the tire case 17. In this case, the covering reinforcing cord is used.
- the resin material covered with the reinforcing cord 26 is also heated, so that the air can be effectively suppressed when being embedded in the crown portion 16.
- the tire 10 of the first embodiment is a so-called tubeless tire in which an air chamber is formed between the tire 10 and the rim 20 by attaching the bead portion 12 to the rim 20, but the present invention is limited to this configuration. It may be a complete tube shape.
- Examples 1 to 12 The elastomer component and the crosslinking component described in Tables 1 and 2 below were put into a Banbury mixer, kneaded for about 2 minutes, and released at 120 ° C. to prepare an elastomer component containing the crosslinking component.
- the prepared elastomer component containing a crosslinking component was pelletized with a rubber pelletizer. Thereafter, the pelletized elastomer component and the resin components listed in Tables 1 and 2 were dry blended in a predetermined composition, charged into a twin-screw kneader, and dynamically crosslinked to prepare a thermoplastic elastomer composition. .
- thermoplastic elastomer composition produced by biaxial kneading was cooled with water and then pelletized. Furthermore, each test piece was produced by injection molding using the pellet, and the following compression set was measured. Note that the injection moldability was evaluated as “A” in which the test piece could be produced by injection molding through Examples and Comparative Examples, and “C” in which the sample piece could not be produced by injection molding.
- Comparative Example 2 After kneading and vulcanizing under the same conditions as in Comparative Example 1, the obtained vulcanized rubber was pulverized by a pulverizer to obtain a powdered vulcanized rubber having an average particle size of 250 ⁇ m. Thereafter, the rubber and the resin component shown in Table 2 were dry blended with a predetermined composition and charged into a twin-screw kneader to prepare a thermoplastic elastomer composition. Next, the produced thermoplastic elastomer composition was cooled with water and pelletized.
- thermoplastic elastomer composition of Comparative Example 2 used the resin component in the present invention and the elastomer component in the present invention, the melt viscosity was high and injection molding could not be performed. For this reason, the sample piece was produced by press molding.
- compression set In accordance with JIS K6262-2006, a test piece having a diameter of 13 mm and a thickness of 6 mm was used and compressed at 25 ° C. for 22 hours at 100 ° C., and compression set was measured. At this time, the values of each Example when the value of Comparative Example 2 is set to 100 are shown in Table 1 below. In addition, it is excellent in the compression set property at the time of high temperature, so that the value of the said numerical value is large.
- Examples 13 to 19 and Comparative Example 3 In the same manner as in Example 1, a thermoplastic elastomer composition dynamically crosslinked according to Table 3 below was prepared and evaluated in the same manner.
- ESBR emulsion polymerization SBR, manufactured by JSR Corporation (product name # 1500) ⁇ Carboxyl-containing SBR (Production method is as follows) (Manufacturing method) First, a cyclohexane solution of 1,3-butadiene and a cyclohexane solution of styrene were added to an 800 mL pressure-resistant glass container that had been dried and purged with nitrogen so as to be 60 g of 1,3-butadiene and 15 g of styrene.
- -BR Butadiene rubber, manufactured by JSR Corporation (product name: BR01)
- NR natural rubber
- IR isoprene rubber, manufactured by JSR Corporation (product name: IR2200)
- IIR Butyl rubber, manufactured by JSR Corporation (Product name: Bromobutyl 2245)
- EPDM ethylene propylene diene rubber, manufactured by JSR Corporation (product name: EP43)
- Modified EPDM (Production method is as follows) (Preparation of maleic acid-modified EPDM) 5 times mole amount of maleic anhydride and 0.1 part by weight of dicumyl peroxide are mixed and kneaded with EPDM (manufactured by JSR Corporation, product name: EP-22) and heated at 160 to 180 ° C.
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Abstract
Description
[先行技術文献]
[特許文献1]特開2003-104008号公報
[特許文献2]特表2006-514141号公報
上述のように前記タイヤは、樹脂材料を用いたタイヤ骨格体を有する。前記樹脂材料は、少なくとも本発明における熱可塑性樹脂と本発明におけるエラストマー成分とが動的架橋された樹脂組成物を含む。本発明において、「樹脂材料」は、前記樹脂組成物以外に添加剤など他の成分を含んでいてもよい。前記樹脂材料が前記樹脂組成物以外の成分を含有しない場合、樹脂材料は前記樹脂組成物のみで構成されることとなる。また、本明細書において「樹脂」とは、熱可塑性樹脂及び熱硬化性樹脂を含む概念であるが、天然ゴムは含まない。
前記樹脂組成物は、熱可塑性樹脂(本発明における樹脂成分)とエラストマー(本発明におけるエラストマー成分)とを動的架橋することで調製することができる。ここで「動的架橋」とは、熱可塑性樹脂と、エラストマー成分とが高剪断条件下で架橋される架橋工程を意味する。このように高剪断条件下でエラストマー成分を熱可塑性樹脂に架橋させると、架橋の際にエラストマー成分を熱可塑性樹脂のマトリックス中に微粒子として分散させやすい。前記動的架橋は、ロールミル、バンバリー(登録商標)ミキサー、連続ミキサー、ニーダー又は混合用押出機(例えば2軸押出機)などの混合装置の中で、混合物の架橋温度又はそれよりも高い温度で各成分を混合することによって行われる。このように、本発明における樹脂成分と本発明におけるエラストマー成分とを動的架橋することで、樹脂材料の高温永久歪性を向上させることができ、更に高弾性と優れた低ロス性との両立を実現したタイヤを製造することができる。
本発明における熱可塑性樹脂としては、ポリアミド系熱可塑性樹脂、ポリエステル系熱可塑性樹脂及びポリオレフィン系熱可塑性樹脂から選ばれる少なくとも1種が用いられる。この中でも前記熱可塑性樹脂としては、ポリアミド系熱可塑性樹脂が特に好ましい。
前記ポリアミド系熱可塑性樹脂としては、例えば、ε-カプロラクタムを開環重縮合したポリアミド(ナイロン6)、ウンデカンラクタムを開環重縮合したポリアミド(ナイロン11)、ラウリルラクタムを開環重縮合したポリアミド(ナイロン12)、ジアミンと二塩基酸とを重縮合ポリアミド(ナイロン66)又はメタキシレンジアミンを構成単位として有するポリアミド(ナイロンMX)等を挙げることができる。ナイロン46、ナイロン610、ナイロン612、ナイロン6/66共重合体、ナイロン6/66/610共重合体、ナイロンMXD6、ナイロン6T、ナイロン6/6T共重合体、ナイロン66/PP共重合体、ナイロン66/PPS共重合体等も用いることができる。
前記ナイロン6としては、例えば、市販品の宇部興産社製「UBEナイロン」1022B、1011FB等を用いることができる。
前記アミド12としては、宇部興産社製「UBEナイロン」、例えば、3024U等を用いることができる。前記ナイロン66としては、「UBEナイロン」等を用いることができる。また、前記アミドMXとしては、例えば、市販品の三菱ガス化学社製のMXナイロン(S6001、S6021,S6011)等を用いることができる。
前記ポリエステル系熱可塑性樹脂は、主鎖にエステル結合を有する樹脂である。
ポリエステル系熱可塑性樹脂は特に限定されるものではないが、結晶性でも非晶性でもよく、例えば、脂肪族系ポリエステル、芳香族系ポリエステル等が挙げられる。脂肪族系ポリエステルは、飽和脂肪族系ポリエステルであっても、不飽和脂肪族系ポリエステルであってもよい。
芳香族ポリエステルとしては、例えば、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリエチレンイソフタレート、ポリブチレンテレフタレート/テトラメチレングリコール共重合体、ポリエチレンテレフタレート/ポリエチレンイソフタレート共重合体、ポリアリレート、ポリブチレンナフタレート、液晶ポリエステル、ポリオキシアルキレンジイミドジ酸/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が挙げられる。
前記ポリオレフィン系熱可塑性樹脂としては、プロピレン、エチレン等のα-オレフィン、シクロオレフィン等の環状オレフィンの単独重合体、ランダム共重合体、ブロックコポリマー等が挙げられる。具体的には、ポリエチレン系熱可塑性樹脂、ポリプロピレン系熱可塑性樹脂、ポリブタジエン系熱可塑性樹脂などが挙げられ、特に、耐熱性、加工性の点から、ポリプロピレン系熱可塑性樹脂が好ましい。
前記ポリプロピレン系熱可塑性樹脂の具体例としては、プロピレンホモ重合体、プロピレン-α-オレフィンランダム共重合体、プロピレン-α-オレフィンブロック共重合体などが挙げられる。α-オレフィンとしては、例えば、プロピレン、1-ブテン、1-ペンテン、3-メチル-1-ブテン、1-ヘキセン、4-メチル-1-ペンテン、3-メチル-1-ペンテン、1-ヘプテン、1-オクテン、1-デセン、1-ドデセン、1-テトラデセン、1-ヘキサデセン、1-オクタデセン、1-エイコセン等の炭素数3~20程度のα-オレフィン等が挙げられる。
本発明のタイヤは、ポリオレフィン系熱可塑性樹脂を含む熱可塑性樹脂材料を用いることで、100~200℃の温度範囲で融着された骨格体であってもタイヤ骨格片同士の接着強度を向上させることができ、耐パンク性や耐摩耗性など走行時における耐久性を向上させることができる。尚、前記加熱温度は、タイヤ骨格片を形成するポリオレフィン系熱可塑性エラストマーを含む熱可塑性樹脂材料の融点よりも10~150℃高い温度が好ましく、10℃~100℃高い温度が更に好ましい。
前記本発明における熱可塑性樹脂に動的架橋させる本発明におけるエラストマー成分としては、ジエン系ゴム、酢酸ビニルコポリマー、ポリウレタン、エチレンプロピレンゴム及びこれらの混合物が含まれる。また、本発明のエラストマー成分には、前記ジエン系ゴム、前記酢酸ビニルコポリマー、前記ポリウレタン、前記エチレンプロピレンゴムの変性物も含まれる。前記ジエン系ゴムとしては、ジエン系ゴム及びその水添物(例えば、天然ゴム、イソプレンゴム、エポキシ化天然ゴム、スチレンブタジエンゴム,ブタジエンゴム(高シスBR及び低シスBR)、アクリロニトリルブタジエンゴム、水素化アクリロニトリルブタジエンゴム、水素化スチレンブタジエンゴム)やジエン系ゴムの変性物などが挙げられる。尚、当該ジエン系ゴムには、ブチルゴム(IIR)は含まれない。前記ジエン系ゴムとしては、スチレンブタジエンゴム、マレイン酸変性スチレンブタジエンゴムなどのカルボキシル基含有スチレンブタジエンゴム、乳化重合スチレンブタジエンゴム、ブタジエンゴム、イソプレンゴム又は天然ゴムが好ましい。前記酢酸ビニルコポリマーとしては、エチレン酢酸ビニル共重合体(例えば、東ソー株式会社製の「ウルトラセン」シリーズ)やその変性物等が挙げられる。
前記ポリウレタン系熱可塑性エラストマーは、前記ハードセグメントを形成するポリマー及びソフトセグメントを形成するポリマーを公知の方法によって共重合することで合成することができる。前記ポリウレタン系熱可塑性エラストマーとしては、例えば、特開平5-331256に記載の熱可塑性ポリウレタンを用いることができる。
前記ポリウレタン系熱可塑性エラストマーとして、具体的には、芳香族ジオールと芳香族ジイソシアネートとからなるハードセグメントと、ポリ炭酸エステルからなるソフトセグメントの組合せが好ましく、トリレンジイソシアネート(TDI)/ポリエステル系ポリオール共重合体、TDI/ポリエーテル系ポリオール共重合体、TDI/カプロラクトン系ポリオール共重合体、TDI/ポリカーボネート系ポリオール共重合体、4,4’-ジフェニルメタンジイソシアネート(MDI)/ポリエステル系ポリオール共重合体、MDI/ポリエーテル系ポリオール共重合体、MDI/カプロラクトン系ポリオール共重合体、MDI/ポリカーボネート系ポリオール共重合体、MDI+ヒドロキノン/ポリヘキサメチレンカーボネート共重合体が好ましく、TDI/ポリエステル系ポリオール共重合体、TDI/ポリエーテル系ポリオール共重合体、MDI/ポリエステルポリオール共重合体、MDI/ポリエーテル系ポリオール共重合体、MDI+ヒドロキノン/ポリヘキサメチレンカーボネート共重合体が更に好ましい。
また、熱可塑性樹脂として、ポリアミド系熱可塑性樹脂を用いた場合、ポリアミド系熱可塑性樹脂と親和性のあるポリマーを併用することもできる。ポリアミド系熱可塑性樹脂と親和性のあるポリマーとしては、ポリアミド樹脂と反応性を有する官能基を有する変性用ポリマーや、他の熱可塑性樹脂を使用することもできる。
例えば、前記無水物基を有する変性用ポリマーとしては、オレフィンのホモポリマー又はコポリマーを挙げることができる。エチレンと、プロピレン、ブテン、ヘキセン及びオクテンから選択された少なくとも1種のα-オレフィンとのコポリマーは、破断時伸び及び破断時強度の観点から特に好ましい。
更に、トリフォスファイト老化防止剤、ヒンダードフェノール老化防止剤単独又は他の老化防止剤と組合せた老化防止剤を、好ましくは5phr(即ちゴム100質量部当りの質量部)以下、更に好ましくは4phr以下、更にもっと好ましくは3phr以下、更に一層好ましくは2phr下、最も好ましくは1phr以下用いることができる。前記トリフォスファイト老化防止剤の典型例はトリス(ジ-tert-ブチルフェニル)ホスファイト、トリス-ノニルフェニルホスファイトであり、ヒンダードフェノール老化防止剤の典型例は、4,4’-ブチリデンビス-(3-メチル-6-tert-ブチルフェノール)、2,4-ビス〔(オクチルチオ)メチル〕-o-クレゾールが挙げられる。
上述のように、前記樹脂組成物は、本発明における熱可塑性樹脂と本発明におけるエラストマーとを動的架橋することによって調製される。
次に、タイヤ骨格体を構成する樹脂材料の好ましい物性について説明する。本発明におけるタイヤ骨格体は、上述の樹脂材料を用いるものである。
このように、融点が120℃~250℃の樹脂材料を用いることで、例えばタイヤの骨格体を、その分割体(骨格片)を融着して形成する場合に、120℃~250℃の周辺温度範囲で融着された骨格体であってもタイヤ骨格片同士の接着強度が十分である。このため、本発明のタイヤは耐パンク性や耐摩耗性など走行時における耐久性に優れる。尚、前記加熱温度は、タイヤ骨格片を形成する樹脂材料の融点(又は軟化点)よりも10℃~150℃高い温度が好ましく、10℃~100℃高い温度が更に好ましい。
溶融混合して得られた樹脂材料は、必要に応じてペレット状にして用いることができる。
以下に、図面に従って本発明のタイヤの第1の実施形態に係るタイヤを説明する。
本実施形態のタイヤ10について説明する。図1Aは、本発明の一実施形態に係るタイヤの一部の断面を示す斜視図である。図1Bは、リムに装着したビード部の断面図である。図1Aに示すように、本実施形態のタイヤ10は、従来一般のゴム製の空気入りタイヤと略同様の断面形状を呈している。
また、本実施形態では、タイヤケース半体17Aは左右対称形状、即ち、一方のタイヤケース半体17Aと他方のタイヤケース半体17Aとが同一形状とされているので、タイヤケース半体17Aを成形する金型が1種類で済むメリットもある。
以下、本実施形態のタイヤの製造方法について説明する。
まず、上述のようにナイロン6とマレイン酸変性EPDMとを動的架橋させた樹脂組成物を含む樹脂材料を用いて、タイヤケース半体を形成する。これらタイヤケースの形成は、射出成形で行うことが好ましい。次に、薄い金属の支持リングに支持されたタイヤケース半体同士を互いに向かい合わせる。次いで、タイヤケース半体の突き当て部分の外周面と接するように図を省略する接合金型を設置する。ここで、前記接合金型はタイヤケース半体17Aの接合部(突き当て部分)周辺を所定の圧力で押圧するように構成されている。次いで、タイヤケース半体の接合部周辺を、タイヤケースを構成する樹脂材料の融点(又は軟化点)以上で押圧する。タイヤケース半体の接合部が接合金型によって加熱・加圧されると、前記接合部が溶融しタイヤケース半体同士が融着しこれら部材が一体となってタイヤケース17が形成される。尚、本実施形態においては接合金型を用いてタイヤケース半体の接合部を加熱したが、本発明はこれに限定されず、例えば、別に設けた高周波加熱機等によって前記接合部を加熱したり、予め熱風、赤外線の照射等によって軟化又は溶融させ、接合金型によって加圧して。タイヤケース半体を接合させてもよい。
次に、補強コード巻回工程について図3を用いて説明する。図3は、コード加熱装置、及びローラ類を用いてタイヤケースのクラウン部に補強コードを埋設する動作を説明するための説明図である。図3において、コード供給装置56は、補強コード26を巻き付けたリール58と、リール58のコード搬送方向下流側に配置されたコード加熱装置59と、補強コード26の搬送方向下流側に配置された第1のローラ60と、第1のローラ60をタイヤ外周面に対して接離する方向に移動する第1のシリンダ装置62と、第1のローラ60の補強コード26の搬送方向下流側に配置される第2のローラ64と、及び第2のローラ64をタイヤ外周面に対して接離する方向に移動する第2のシリンダ装置66と、を備えている。第2のローラ64は、金属製の冷却用ローラとして利用することができる。また、本実施形態において、第1のローラ60又は第2のローラ64の表面は、溶融又は軟化した樹脂材料の付着を抑制するためにフッ素樹脂(本実施形態では、テフロン(登録商標))でコーティングされている。なお、本実施形態では、コード供給装置56は、第1のローラ60又は第2のローラ64の2つのローラを有する構成としているが、本発明はこの構成に限定されず、何れか一方のローラのみ(即ち、ローラ1個)を有している構成でもよい。
本実施形態のタイヤ10では、タイヤケース17が、本発明における熱可塑性樹脂と本発明におけるエラストマー成分とが動的架橋された樹脂組成物を含む樹脂材料によって形成されているため、高温永久歪性に優れ、高弾性率でありながら優れた低ロス性を達成できる。また、タイヤ10は従来のゴム製のタイヤに比して構造が簡易であるため重量が軽い。このため、本実施形態のタイヤ10は、耐摩擦性及び耐久性が高い。更に、タイヤケース17を射出成形できることから生産性にも非常に優れる。
更に、補強コード26がスチールコードの場合に、タイヤ処分時に補強コード26を加熱によって樹脂材料から容易に分離・回収が可能であるため、タイヤ10のリサイクル性の点で有利である。また、樹脂材料は加硫ゴムに比して損失係数(tanδ)が低いため、補強コード層28が樹脂材料を多く含んでいると、タイヤの転がり性を向上させることができる。更には、樹脂材料は加硫ゴムに比して、面内せん断剛性が大きく、タイヤ走行時の操安性や耐摩耗性にも優れるといった利点がある。
さらに、ビード部12には、金属材料からなる環状のビードコア18が埋設されていることから、従来のゴム製の空気入りタイヤと同様に、リム20に対してタイヤケース17、すなわちタイヤ10が強固に保持される。
下記表1及び2に記載のエラストマー成分と架橋成分とをバンバリーミキサーに投入し、約2分間混練し、120℃で放出して架橋成分入りエラストマー成分を調製した。調製した架橋成分入りエラストマー成分は、ゴム用ペレタイザーでペレット化した。
その後、前記ペレット化したエラストマー成分と表1及び2に記載の樹脂成分とを所定の配合にてドライブレンドし、2軸混練機に投入し、動的架橋して熱可塑性エラストマー組成物を調製した。動的架橋時の混練条件は、樹脂の溶融温度よりも高い温度とし、温度270℃、剪断速度1000s-1で行なった。
次いで、2軸混練によって作製された熱可塑性エラストマー組成物を水冷し、その後、ペレット化した。更に、当該ペレットを用い、射出成形によって各試験片を作製し、以下の圧縮永久歪を測定した。
尚、実施例及び比較例を通じて射出成形によって試験片を作製できたものを「A」、射出成形によって試料片を作製できなかったものを「C」として射出成形性を評価した。
バンバリーミキサーを用いて、表2に記載のエラストマー成分を3分間混練した。この際の混練温度(第1段階温度)は120℃であった。次いで、下記表2に記載の架橋成分を投入し、80℃で1分間混合し、その後、プレス加硫を160℃、15分間行い比較例1におけるゴム材料を作製した。得られた材料は通常の配合ゴムであり、射出成形性は発揮できなかった。
比較例1と同条件で、混練・加硫を行った後、得られた加硫ゴムを粉砕機にて粉砕し、平均粒径250μmの粉状加硫ゴムを得た。その後、前記ゴムと表2に記載の樹脂成分とを所定の配合でドライブレンドし、2軸混練機に投入し、熱可塑性エラストマー組成物を調製した。次いで、作製された熱可塑性エラストマー組成物を水冷し、ペレット化した。比較例2の熱可塑性エラストマー組成物は、本発明における樹脂成分と、本発明におけるエラストマー成分とを用いているものの、溶融粘度が高く、射出成形ができなかった。このため、プレス成型にて試料片を作製した。
JIS K6262-2006に準拠し、直径13mm、厚さ6mmの試験片を用いて、25%圧縮で100℃にて22時間圧縮し、圧縮永久歪を測定した。この際、比較例2の値を100とした場合における各実施例の値を下記表1に示す。尚、当該数値の値が大きい程、高温時における圧縮永久歪性に優れている。
粘弾性測定装置(レオメトリックス社製)を使用し、温度50℃、歪み3%、周波数15Hzでtanδ(50℃)を測定した。tanδ(50℃)が小さい程、低ロス性に優れている。
実施例及び比較例で作製したペレットを用いて、住友重工社製、SE30Dを用い、射出成形を行い、成形温度180℃~260℃、金型温度50℃~70℃とし、100mm×30mm、厚さ2.0mmのサンプルを得た。尚、比較例2については、プレス成型にて試料片を作製した。
各サンプルを打ち抜き、JISK6251:1993に規定されるダンベル状試料片(5号形試料片)を作製した。
実施例1と同様に、下記表3に従って動的架橋した熱可塑性エラストマー組成物を調製し同様の評価を行った。
・ESBR:乳化重合SBR、JSR(株)製(製品名#1500)
・カルボキシル基含有SBR(製法は以下の通り)
(製法)
まず、乾燥し窒素置換した800mLの耐圧ガラス容器に、1,3-ブタジエンのシクロヘキサン溶液、及びスチレンのシクロヘキサン溶液を、1,3-ブタジエン60g及びスチレン15gとなるように加えた。次いで、2,2-ジテトラヒドロフリルプロパン0.36mmolを加え、更にn-ブチルリチウム(BuLi)0.72mmolを加えた後、50℃の温水浴中で1.5時間重合反応を行なった。この際の重合転化率は、ほぼ100%であった。次に、重合反応系に無水マレイン酸を0.65mmol加え、さらに50℃で30分間酸変性反応を行った。その後、重合反応系に2,6-ジ-t-ブチル-p-クレゾールのイソプロパノール5質量%溶液0.5mlを加えて重合反応を停止させ、常法に従い乾燥しマレイン酸変性ポリマー(カルボキシル基含有SBR)を得た。
・BR:ブタジエンゴム、JSR(株)製(製品名:BR01)
・NR:天然ゴム
・IR:イソプレンゴム、JSR(株)製(製品名:IR2200)
・IIR:ブチルゴム、JSR(株)製、(製品名:Bromobutyl2245)
・EPDM:エチレンプロピレンジエンゴム、JSR(株)製(製品名:EP43)
・変性EPDM(製法は以下の通り)
(マレイン酸変性EPDMの作製)
EPDM(JSR(株)製、製品名:EP-22)に対して5倍モル量の無水マレイン酸と、ジクミルペルオキシド0.1重量部とを混合して混練し、160~180℃で加熱処理して、マレイン酸変性EPDMを得た。
・タフマーMP-0610(三井石油化学(株)製)
・PU:ポリウレタン、BASFジャパン(株)製(製品名:エラストラン1164D)
・EVA:東ソー株式会社製(製品名:ウルトラセン633)
・老化防止剤6PPD:N-(1,3-ジメチルブチル)-N’-フェニル-p-フェニレンジアミン(ノクラック6C、大内新興化学工業(株)製)
・老化防止剤A:BASFジャパン(株)製(製品名:イルガノックス(Irganox)1098)
・架橋剤:ジクミルペルオキシド(DCP)、日油株式会社製(製品名:パークミルD-40)
・亜鉛華:酸化亜鉛
・C/B:カーボンブラック、旭カーボン(株)製(製品名:#80)
・加硫促進剤DPG:大内新興化学工業製(製品名「ノクセラーD」)
・加硫促進剤DM:大内新興化学工業製(製品名「ノクセラーDM」)
・加硫促進剤DM:大内新興化学工業製(製品名「ノクセラーCZ」)
・ナイロン6:宇部興産(株)製(製品名:1022B)
・ナイロン12:宇部興産(株)製(製品名:3020U)
・ポリエステル:ウィンテックポリマー(株)製(製品名:ジュラネックス2002)
・ポリオレフィン系樹脂:(株)プライムポリマー製(製品名:J-700GP)
・BM-4:大八化学(株)製、n-ブチルベンゼンスルホンアミド
Claims (7)
- 樹脂材料で形成され且つ環状のタイヤ骨格体を有し、
前記樹脂材料は、(1)ポリアミド系熱可塑性樹脂、ポリエステル系熱可塑性樹脂及びポリオレフィン系熱可塑性樹脂から選ばれる少なくとも1種の熱可塑性樹脂と、(2)ジエン系ゴム、酢酸ビニルコポリマー、ポリウレタン、エチレンプロピレンゴム及びこれらの混合物から選ばれる少なくとも1種のエラストマーと、が動的架橋された樹脂組成物を含むタイヤ。 - 前記樹脂組成物は、前記エラストマー100質量部に対して、40~500質量部の前記熱可塑性樹脂を含む請求項1に記載のタイヤ。
- 前記熱可塑性樹脂がポリアミド系熱可塑性樹脂である請求項1又は2に記載のタイヤ。
- 前記エラストマーが、前記エチレンプロピレンゴム又はその変性物である請求項1~3のいずれか1項に記載のタイヤ。
- 前記エチレンプロピレンゴムが、エチレンとプロピレンとジエン化合物とのゴム状共重合体又はエチレンとプロピレンとのゴム状共重合体である請求項4に記載のタイヤ。
- 前記エチレンプロピレンゴムが、マレイン酸変性エチレンプロピレンゴムである請求項4又は5に記載のタイヤ。
- 前記タイヤ骨格体のサイド部が少なくとも前記樹脂材料で形成されている請求項1~6のいずれか1項に記載のタイヤ。
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CN105038200A (zh) * | 2015-05-14 | 2015-11-11 | 湖南工业大学 | 一种多元复合增韧尼龙6复合材料、复合增韧剂及其制备方法 |
WO2016106408A1 (en) * | 2014-12-26 | 2016-06-30 | Compagnie Generale Des Etablissements Michelin | Tire treads with functionalized rubber |
JP2016141346A (ja) * | 2015-02-04 | 2016-08-08 | 株式会社ブリヂストン | タイヤ |
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Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05331256A (ja) | 1992-06-02 | 1993-12-14 | Sanko Chem Co Ltd | 熱可塑性ポリウレタンの製造方法 |
JP2003104008A (ja) | 2001-09-28 | 2003-04-09 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
JP2004346137A (ja) * | 2003-05-20 | 2004-12-09 | Sumitomo Rubber Ind Ltd | 弾性部材および紙送りローラ |
WO2005063482A1 (ja) | 2003-12-25 | 2005-07-14 | The Yokohama Rubber Co., Ltd. | 耐候性が改良された熱可塑性樹脂エラストマー/ゴム積層体及びそれを用いた空気入りタイヤ |
JP2006514141A (ja) | 2003-03-06 | 2006-04-27 | 横浜ゴム株式会社 | 改良されたゴムペレット化工程を用いた熱可塑性エラストマー組成物 |
JP2010516835A (ja) | 2007-01-18 | 2010-05-20 | 横浜ゴム株式会社 | 優れた伸長性及び屈曲疲労を有するポリアミド樹脂組成物並びにそれを使用する空気入りタイヤ及びホース |
JP2012046022A (ja) * | 2010-08-25 | 2012-03-08 | Bridgestone Corp | タイヤ |
JP2012046019A (ja) * | 2010-08-25 | 2012-03-08 | Bridgestone Corp | タイヤ |
JP2013039750A (ja) | 2011-08-17 | 2013-02-28 | Meishin Seiko:Kk | スライドユニット及びスライドガイド装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4501326B2 (ja) * | 2001-09-28 | 2010-07-14 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP2010137820A (ja) * | 2008-12-15 | 2010-06-24 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ及びその製造方法 |
EP3254866B1 (en) | 2010-08-25 | 2020-04-15 | Bridgestone Corporation | Tire, and tire manufacturing method |
WO2012026548A1 (ja) * | 2010-08-25 | 2012-03-01 | 株式会社ブリヂストン | タイヤ及びその製造方法 |
US9586355B2 (en) * | 2011-03-11 | 2017-03-07 | Exxonmobil Chemical Patents Inc. | Dynamically vulcanized thermoplastic elastomer film |
WO2013129525A1 (ja) * | 2012-02-29 | 2013-09-06 | 株式会社ブリヂストン | タイヤ |
JPWO2013129631A1 (ja) | 2012-02-29 | 2015-07-30 | 株式会社ブリヂストン | タイヤ |
-
2014
- 2014-02-27 US US14/770,466 patent/US9884515B2/en active Active
- 2014-02-27 WO PCT/JP2014/054962 patent/WO2014133105A1/ja active Application Filing
- 2014-02-27 JP JP2015503032A patent/JP6419689B2/ja active Active
- 2014-02-27 CN CN201480010727.6A patent/CN105102239B/zh active Active
- 2014-02-27 EP EP14757556.7A patent/EP2962869B1/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05331256A (ja) | 1992-06-02 | 1993-12-14 | Sanko Chem Co Ltd | 熱可塑性ポリウレタンの製造方法 |
JP2003104008A (ja) | 2001-09-28 | 2003-04-09 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
JP2006514141A (ja) | 2003-03-06 | 2006-04-27 | 横浜ゴム株式会社 | 改良されたゴムペレット化工程を用いた熱可塑性エラストマー組成物 |
JP2004346137A (ja) * | 2003-05-20 | 2004-12-09 | Sumitomo Rubber Ind Ltd | 弾性部材および紙送りローラ |
WO2005063482A1 (ja) | 2003-12-25 | 2005-07-14 | The Yokohama Rubber Co., Ltd. | 耐候性が改良された熱可塑性樹脂エラストマー/ゴム積層体及びそれを用いた空気入りタイヤ |
JP2010516835A (ja) | 2007-01-18 | 2010-05-20 | 横浜ゴム株式会社 | 優れた伸長性及び屈曲疲労を有するポリアミド樹脂組成物並びにそれを使用する空気入りタイヤ及びホース |
JP2012046022A (ja) * | 2010-08-25 | 2012-03-08 | Bridgestone Corp | タイヤ |
JP2012046019A (ja) * | 2010-08-25 | 2012-03-08 | Bridgestone Corp | タイヤ |
JP2013039750A (ja) | 2011-08-17 | 2013-02-28 | Meishin Seiko:Kk | スライドユニット及びスライドガイド装置 |
Non-Patent Citations (3)
Title |
---|
"Encyclopedia of Polymer Science and Technology", vol. 10, pages: 392 - 414 |
KIRK-OTHMER: "Encyclopedia of Polymer Science and Technology", vol. 10, pages: 392 - 414 |
See also references of EP2962869A4 |
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US10442922B2 (en) | 2015-02-04 | 2019-10-15 | Bridgestone Corporation | Tire |
EP3255097A4 (en) * | 2015-02-04 | 2018-02-28 | Bridgestone Corporation | Tire |
EP3255099A4 (en) * | 2015-02-04 | 2018-03-07 | Bridgestone Corporation | Tire |
CN105038200A (zh) * | 2015-05-14 | 2015-11-11 | 湖南工业大学 | 一种多元复合增韧尼龙6复合材料、复合增韧剂及其制备方法 |
JP2017013681A (ja) * | 2015-07-02 | 2017-01-19 | 株式会社ブリヂストン | タイヤ |
WO2017047472A1 (ja) * | 2015-09-18 | 2017-03-23 | 横浜ゴム株式会社 | スチールコード被覆用ゴム組成物及びタイヤ |
JPWO2017047472A1 (ja) * | 2015-09-18 | 2018-07-05 | 横浜ゴム株式会社 | スチールコード被覆用ゴム組成物及びタイヤ |
WO2017104187A1 (ja) * | 2015-12-14 | 2017-06-22 | 株式会社ブリヂストン | タイヤ |
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JP2017149183A (ja) * | 2016-02-22 | 2017-08-31 | 株式会社ブリヂストン | タイヤ |
WO2020196272A1 (ja) * | 2019-03-26 | 2020-10-01 | バンドー化学株式会社 | 架橋ゴム組成物及びそれを用いたゴム製品 |
JP6804010B1 (ja) * | 2019-03-26 | 2020-12-23 | バンドー化学株式会社 | 架橋ゴム組成物及びそれを用いたゴム製品 |
WO2022176502A1 (ja) * | 2021-02-16 | 2022-08-25 | 住友ゴム工業株式会社 | タイヤ |
JP2022124771A (ja) * | 2021-02-16 | 2022-08-26 | 住友ゴム工業株式会社 | タイヤ |
JP7188473B2 (ja) | 2021-02-16 | 2022-12-13 | 住友ゴム工業株式会社 | タイヤ |
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