Tire with functional components

Abstract

A tire is provided in which a housing for a functional component is provided on the inner surface of the tread, and the sensor function of the functional component and the durability of the housing are excellent. Furthermore, the above-mentioned problems are solved by a tire in which a housing for a functional component is provided on the inner surface of the tread, the functional component having at least a contact surface that contacts the inner surface of the tire and a sensor function for detecting tire information, the housing being composed of a rubber component comprising at least 60% by mass of butyl rubber (IIR) and at least 40% by mass of natural rubber (NR), and containing 40 to 82 parts by mass of carbon black relative to 100 parts by mass of the rubber component.

Description

Technical Field

[0001] This invention relates to a tire having a functional component on the inner surface of the tire that has a sensor function for detecting tire information. Background Technology

[0002] To detect tire information, functional components with sensor functions (such as electronic components like sensor units) are provided on the tire. In particular, for ease of tire pressure detection and wear detection, such functional components are provided on the inner surface of the tire tread (for example, Patent Documents 1-2).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2022 / 123854

[0006] Patent Document 2: International Publication No. 2022 / 181267 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] Here, the housing that houses the functional components disposed on the inner surface of the tire tread is susceptible to forces generated by tire rotation or impacts from the road surface during driving, thus posing a challenge in terms of durability. Furthermore, Patent Documents 1 and 2 disclose tires that are difficult to detach from the tire surface even under large impacts during high-speed driving or high-speed driving in low-temperature environments. However, these tires have limitations due to the rubber properties of the tire components and / or the mounting position of the electronic component mounting components (housing), leaving room for improvement. Additionally, the sensor's sensing intensity is difficult to increase due to the rotation of the tire during driving, and there is also room for further improvement in this regard.

[0009] Therefore, the object of the present invention is to provide a tire having a housing on the inner surface of the tread portion that houses a functional component, and the sensor strength of the functional component and the durability of the housing are excellent.

[0010] Methods for solving problems

[0011] To address the aforementioned issues, the inventors conducted intensive research and discovered that a tire with a housing containing a functional component on the inner surface of the tread is a tire with excellent sensor strength of the functional component and durability of the housing. This led to the completion of the present invention. In the tire, the functional component has at least a contact surface that contacts the inner surface of the tire and a sensor function for detecting tire information. The housing is composed of a rubber component containing 60% by mass or more butyl rubber (IIR) and 40% by mass or less natural rubber (NR), and 40 to 82 parts by mass of carbon black relative to 100 parts by mass of the rubber component.

[0012] That is, the present invention includes the following: <1> ~ <11> The implementation method.

[0013] <1> A tire has a housing on the inner surface of the tread section that houses functional components.

[0014] The functional component has at least a contact surface that contacts the inner surface of the tire and a sensor function for detecting tire information.

[0015] The containment body is composed of a rubber component, which contains 60% or more by mass, more preferably more than 60% by mass, further preferably 65% ​​or more by mass, and even more preferably 70% or more by mass of butyl rubber (IIR), and the content of natural rubber (NR) is 40% or less by mass, more preferably less than 40% by mass, further preferably 35% or less by mass, and even more preferably 30% or less by mass. Relative to 100 parts by mass of the rubber component, it also contains 40 to 82 parts by mass, more preferably 45 to 80 parts by mass of carbon black.

[0016] <2> according to <1> The tires mentioned above,

[0017] The containment contains a total of 40 to 85 parts by mass, more preferably 45 to 80 parts by mass, of the carbon black and white filler relative to 100 parts by mass of the rubber component.

[0018] <3> according to <2> The tires mentioned above,

[0019] The white filler is selected from one or more (at least one) of silica, talc, mica, clay and calcium carbonate.

[0020] <4> according to <2> or <3> The tires mentioned above,

[0021] The white filler contains 3 to 40 parts by weight, more preferably 10 to 30 parts by weight, relative to 100 parts by weight of the rubber component.

[0022] <5> according to <1> ~ <4> The tire mentioned in any one of the following,

[0023] The rubber component comprises butyl rubber and natural rubber, wherein the ratio of butyl rubber to natural rubber in the rubber component is 1.5 times or more (IIR / NR is 1.5 or more), more preferably 2 times or more.

[0024] <6> according to <1> ~ <5> The tire mentioned in any one of the following,

[0025] The average nitrogen adsorption specific surface area (N2SA) of the carbon black is 50 m². 2 / g or less, more preferably 10m 2 / g or more and 45m 2 / g or less.

[0026] <7> according to <1> ~ <6> The tire mentioned in any one of the following,

[0027] The tensile stress (M100) of the containment body at 100% elongation at 100°C is 5.0 MPa or less, more preferably 1.0 MPa or more and 4.5 MPa or less, even more preferably 1.0 MPa or more and 3.5 MPa or less, and still more preferably 1.0 MPa or more and 3.0 MPa or less.

[0028] <8> according to <1> ~ <7> The tire mentioned in any one of the following,

[0029] The housing is fixed to the inner surface of the tire.

[0030] <9> according to <8> The tires mentioned above,

[0031] The housing is fixed to the inner surface of the tire by an adhesive.

[0032] <10> according to <1> ~ <9> The tire mentioned in any one of the following,

[0033] The sensor function of the functional component is a sensor function that uses a piezoelectric element as the sensor element.

[0034] <11> according to <10> The tires mentioned above,

[0035] The piezoelectric element is disposed on the contact surface of the functional component that contacts the inner surface of the tire.

[0036] Invention Effects

[0037] According to the present invention, a tire can be obtained in which a housing containing a functional component is provided on the inner surface of the tread, and the sensor strength of the sensor function of the functional component and the durability of the housing are excellent. Attached Figure Description

[0038] Fig. 1 This is a radial cross-sectional view showing an embodiment of the tire involved in the present invention.

[0039] Fig. 2 This is a cross-sectional view showing an embodiment of a housing provided on the inner surface of the tire tread of the tire according to the present invention, and functional components housed in the housing.

[0040] Fig. 3 This is a perspective view showing an embodiment of a housing provided on the inner surface of the tread portion of a tire according to the present invention, and functional components housed in the housing. Detailed Implementation

[0041] The present invention will be described.

[0042] The present invention relates to a tire in which a housing containing functional components is provided on the inner surface of the tread portion. These functional components include at least a contact surface that contacts the inner surface of the tire and a sensor function for detecting tire information. The housing is composed of a rubber component comprising at least 60% by mass of butyl rubber (IIR) and at least 40% by mass of natural rubber (NR), and also contains 40 to 82 parts by mass of carbon black per 100 parts by mass of the rubber component. Hereinafter, this tire will also be referred to as "the tire of the present invention".

[0043] Furthermore, unless otherwise specified, the numerical range represented by “~” in this invention refers to the range of values ​​with the value before “~” as the lower limit and the value after “~” as the upper limit.

[0044] Hereinafter, the composition, components and their content of the housing of the tire of the present invention, and the composition of the tire (integral) of the present invention will be described in detail using the accompanying drawings. Furthermore, for ease of understanding of the invention, the dimensional ratios (length, thickness, etc.) and orientations of the various components shown in the drawings may sometimes differ from the actual dimensional ratios and orientations. Additionally, some reference numerals may be omitted from the drawings.

[0045] [Containment Entity]

[0046] The tire of the present invention includes a housing made of a predetermined rubber composition. Furthermore, this housing is disposed on the inner surface of the tire tread and houses a functional component having a sensor function for detecting tire information, such that it has a contact surface that contacts the inner surface of the tire. For example, as shown...Figs. 1-3 As shown in the following embodiment: the base 31 of the housing 30 is joined and fixed to the inner surface 12 of the tire tread 1 (in Fig. 2 and Fig. 3 The inner surface 12 of the tire that engages with the base 31 is omitted. Its receiving portion 33 receives the functional component 20 in such a way that it is surrounded by the sidewall 32. Moreover, the received functional component 20 has a contact surface 21 that contacts the inner surface 12 of the tire tread 1 via the base 31.

[0047] Here, "the housing is disposed on the inner surface of the tire tread" means that the housing is disposed on the inner surface of the tire tread in a manner connected to the inner surface of the tire tread (the surface of the tire located on the inner circumferential side facing the tread tread). Furthermore, "the functional component has a contact surface that contacts the inner surface of the tire tread" includes not only embodiments where the functional component has a contact surface that directly contacts the inner surface of the tire tread, but also embodiments where the functional component has a component that makes surface contact with the inner surface of the tire tread via a member within the housing (in...). Fig. 1 The embodiment includes an embodiment where the contact surface is the base 31. That is, it includes: an embodiment where the functional component directly contacts the inner surface of the tire tread, and an embodiment where the functional component contacts the inner surface of the tire tread via a member in the housing.

[0048] Furthermore, it is more preferable that the housing containing the functional components is fixed to the inner surface of the tire tread (so that the position of the housing does not change substantially), and even more preferable is an embodiment in which the housing is fixed to the inner surface of the tire tread by an adhesive.

[0049] Epoxy-based adhesives, acrylic-based adhesives, etc., can be used as this adhesive. Alternatively, double-sided tape can also be used.

[0050] The following describes the details of the components contained in the containment body and its physical properties.

[0051] <Rubber Composition>

[0052] The housing of the tire of the present invention is composed of a rubber component comprising 60% by mass or more butyl rubber (IIR) and 40% by mass or less natural rubber (NR). In other words, the housing is composed of a rubber component comprising 60% by mass or more butyl rubber (IIR) and 40% by mass or less natural rubber (NR). As long as the rubber component comprises 60% by mass or more butyl rubber (IIR) and 40% by mass or less natural rubber (NR), there are no other particular limitations, and any known rubber component used in the manufacture of rubber products, such as diene rubber or so-called non-diene rubber, can be used (in combination). In addition to natural rubber (NR) mentioned above, other diene-based rubbers include, for example, butadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer rubber (NBR), chloroprene rubber (CR), synthetic isoprene rubber (IR), styrene-isoprene copolymer rubber, isoprene-butadiene copolymer rubber, and styrene-butadiene-vinylpyridine terpolymer (VP).

[0053] Furthermore, in addition to the aforementioned butyl rubber (IIR), it is also possible to use rubber components other than diene rubbers, such as olefin rubbers (ethylene propylene rubber, acrylic rubber, etc.), fluororubber, and silicone rubber. Additionally, recycled butyl rubber obtained by recycling used rubber products can also be used as butyl rubber (IIR).

[0054] Furthermore, the proportion of butyl rubber (IIR) in the rubber component constituting the housing of the tire of the present invention is more preferably over 60% by mass, more preferably 65% ​​by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, and still more preferably 90% by mass or more. The upper limit may also be 100% by mass, but it is more preferably 95% by mass or less. Furthermore, the proportion of butyl rubber (IIR) in the present invention includes the total proportion of butyl rubber, including recycled butyl rubber, in the case of recycled butyl rubber (the same applies hereinafter).

[0055] Furthermore, from the perspective of more easily achieving the effects of the present invention, the proportion of natural rubber (NR) in the rubber component of the housing of the tire constituting the present invention is more preferably less than 40% by mass, more preferably 35% by mass or less, even more preferably 30% by mass or less, and may also be 20% by mass or less, or may also be 10% by mass or less. The lower limit may also be 0% by mass (in embodiments where it is not substantially included), but is more preferably 1% by mass or more, and even more preferably 5% by mass or more.

[0056] Furthermore, when the rubber component constituting the containment includes natural rubber (NR) and butyl rubber (IIR), from the perspective of more easily achieving the effects of the present invention, the ratio of butyl rubber (IIR) to natural rubber (NR) in the rubber component is further preferably 1.5 times or more (IIR / NR is 1.5 or more), more preferably 2 times or more (IIR / NR is 2.0 or more), even more preferably 2.5 times or more (IIR / NR is 2.5 or more), even more preferably 3 times or more (IIR / NR is 3.0 or more), and even more preferably 5 times or more (IIR / NR is 5.0 or more). There is no particular upper limit; for example, it can be 50 times or less (IIR / NR is 50 or less).

[0057] <Carbon Black>

[0058] The housing of the tire of the present invention contains carbon black in addition to the predetermined rubber components described above as constituent parts. This carbon black is not particularly limited, and any known carbon black used in applications such as rubber products can be used. Specific examples of carbon black include various grades such as SAF-HS, SAF, ISAF-HS, ISAF, ISAF-LS, IISAF-HS, HAF-HS, HAF, HAF-LS, FEF, GPF, SRF, FT, and MT. Furthermore, recycled carbon black obtained by recycling used rubber products can also be used. Moreover, one type of carbon black can be used alone, or two or more types can be used in combination.

[0059] Furthermore, from the perspective of more easily improving the durability of the containment, the average value of the nitrogen adsorption specific surface area (N2SA) of this carbon black is more preferably 50m². 2 / g or less, more preferably 45m 2 / g or less, more preferably 40m 2 / g or less. In other words, larger carbon black particle sizes are preferred. From the perspective of easily suppressing the shedding of functional components, a lower limit of 10 μm is more preferable. 2 / g or more, further preferably 15m 2 / g or more, with 23m being the preferred option. 2 / g or more.

[0060] Here, "carbon black" refers to carbon microparticles with a diameter of approximately 3–500 nm, manufactured industrially under quality control. Furthermore, the nitrogen adsorption specific surface area (N2SA) of carbon black is a value measured according to JIS K6217-2:2017.

[0061] Furthermore, the "average value of nitrogen adsorption specific surface area (N2SA) of carbon black" refers to the value of the nitrogen adsorption specific surface area (N2SA) of a single carbon black when only one type is used, and the value obtained by multiplying the value of the nitrogen adsorption specific surface area (N2SA) of each carbon black used in combination by its usage ratio and then summing the results when two or more types are used in combination. In addition, the total usage ratio of each carbon black is set to 1.0 in this calculation.

[0062] Furthermore, the housing contains 40 to 82 parts by weight of carbon black as described above, relative to 100 parts by weight of the rubber component constituting the housing. The carbon black content is more preferably 42 parts by weight or more, and even more preferably 45 parts by weight or more, relative to 100 parts by weight of the rubber component. The upper limit is more preferably 80 parts by weight or less, more preferably 75 parts by weight or less, even more preferably 70 parts by weight or less, even more preferably 65 parts by weight or less, still more preferably 60 parts by weight or less, and still even more preferably 55 parts by weight or less. Furthermore, if the amount of carbon black is less than 40 parts by weight or more than 82 parts by weight relative to 100 parts by weight of the rubber component, the effects of the present invention may not be achieved. Moreover, if the amount of carbon black exceeds 82 parts by weight relative to 100 parts by weight of the rubber component, the insertability of the functional component into the housing may also be reduced.

[0063] Here, the carbon black content in this invention refers to the total content of carbon black in the case of recycled carbon black and various other types of carbon black. The same applies below.

[0064] <White filler>

[0065] The housing of the tire of the present invention preferably further contains a white filler. The white filler is not particularly limited, and any known white filler used in applications such as rubber products can be used. Specific examples of white fillers include silica, talc, mica, clay, and calcium carbonate. For example, wet silica, dry silica, fumed silica, and diatomaceous earth can be used as silica. Silica manufactured from biomass materials such as rice husks can also be used. Heavy calcium carbonate is more preferably used as calcium carbonate. Furthermore, one type of white filler can be used alone, or two or more types can be used in combination.

[0066] Here, "silicon dioxide" refers to particulate matter composed of silicon dioxide (SiO2) or mainly composed of silicon dioxide (e.g., containing more than 80% by mass, and further more than 90% by mass).

[0067] Furthermore, in this housing, when a white filler is included, it is preferable to contain a total of 40 to 85 parts by mass of the aforementioned carbon black and the white filler relative to 100 parts by mass of the rubber component constituting the housing. Moreover, the combined amount of the carbon black and the white filler relative to the aforementioned 100 parts by mass of the rubber component is more preferably more than 40 parts by mass, further preferably more than 45 parts by mass, and even more preferably more than 55 parts by mass. The upper limit relative to the aforementioned 100 parts by mass of the rubber component is more preferably less than 80 parts by mass, further preferably less than 75 parts by mass, and even more preferably less than 70 parts by mass. Furthermore, if the combined amount of the carbon black and the white filler relative to the aforementioned 100 parts by mass of the rubber component is less than 40 parts by mass or more than 85 parts by mass, the effects of the present invention may not be achieved. Moreover, if the combined amount of the carbon black and the white filler relative to the aforementioned 100 parts by mass of the rubber component exceeds 85 parts by mass, the insertability of the functional components into the housing may also be reduced.

[0068] Furthermore, the content of the white filler (the content of the white filler itself) is not limited, but it is preferably 3 to 40 parts by mass relative to 100 parts by mass of the rubber component constituting the housing. This lower limit is more preferably 10 parts by mass or more relative to the aforementioned 100 parts by mass of the rubber component, and this upper limit is more preferably 30 parts by mass or less relative to the aforementioned 100 parts by mass of the rubber component, and even more preferably 20 parts by mass or less. However, the housing of the tire of the present invention may also be composed of a structure that substantially does not contain white filler.

[0069] <Other Ingredients>

[0070] The housing of the tire of the present invention may also contain any components other than the aforementioned rubber components, carbon black, and white fillers, without significantly affecting the effects of the present invention. For example, it may contain appropriate amounts of resin components (terpene resins, coumarone resins, indene resins, rosin resins, etc.), zinc oxide (zinc white), oils (aromatic oils, etc.), stearic acid, waxes, lecithin, antioxidants, plasticizers, vulcanizing agents, vulcanization accelerators, vulcanization accelerator aids, and other additives commonly used in rubber products. Sulfur is exemplified as a representative vulcanizing agent, and other components besides sulfur may include compounds with interpolymer crosslinking functions such as peroxides. Furthermore, these components may be used in combination.

[0071] For example, the contents of oil, stearic acid, zinc oxide, and resin components in the containment are preferably 0.5 to 10 parts by weight, and more preferably 1.0 to 8.0 parts by weight, relative to 100 parts by weight of the rubber component constituting the containment. Furthermore, the sulfur content in the containment is preferably 0.5 to 5.0 parts by weight, relative to 100 parts by weight of the rubber component constituting the containment. Moreover, the content of vulcanization accelerator in the containment, calculated as a single primary accelerator or a blend with a secondary accelerator, is preferably 0.3 to 3.0 parts by weight, and more preferably 0.5 to 2.0 parts by weight, relative to 100 parts by weight of the rubber component constituting the containment.

[0072] Furthermore, in the housing of the tire of the present invention, when silica is used as a white filler, a silane coupling agent may also be included to further improve the dispersibility of the silica. The silane coupling agent is not particularly limited to any silane compound having a hydrolyzable group and an organic functional group. Furthermore, the hydrolyzable group is not limited; examples include alkoxy, phenoxy, carboxyl, and alkenoxy groups, and more preferably, alkoxysilyl groups obtained by bonding an alkoxy group to a silicon atom. When the hydrolyzable group is an alkoxysilyl group, the number of carbon atoms in the alkoxy group is preferably 1 to 16, more preferably 1 to 4. Examples of alkoxy groups with 1 to 4 carbon atoms include methoxy, ethoxy, and propoxy groups.

[0073] Furthermore, there are no limitations on the organic functional group; any group capable of forming a chemical bond with an organic compound is acceptable. Examples include epoxy, vinyl, acryloyl, methacryloyl, amino, and thioether groups (especially polythioether groups -S). n - (n is an integer greater than 2), thiol, blocked thiol (protected thiol) (e.g., octanoyl thio), etc., among which, thioether (especially dithioether, tetrathioether), thiol, blocked thiol are preferred.

[0074] Furthermore, such silane coupling agents can be used alone or in combination with two or more. Additionally, the preferred silane coupling agent is a sulfur-containing silane coupling agent.

[0075] Furthermore, when silica is used as the aforementioned white filler, it is preferable to include 1 to 20 parts by mass of silane coupling agent relative to 100 parts by mass of silica, and more preferably 2 to 10 parts by mass of silane coupling agent.

[0076] <Tensile stress at 100% elongation at 100℃ (M100)>

[0077] The housing of the tire of the present invention has the aforementioned configuration, and the tensile stress (M100) of the housing at 100% elongation at 100°C is more preferably 5.0 MPa or less. This is because the housing and the like can easily become a configuration with sufficient durability to withstand the forces and impacts generated by the rotation of the tire during driving.

[0078] The M100 is more preferably 4.5 MPa or less, even more preferably 4.0 MPa or less, even more preferably 3.5 MPa or less, and still more preferably 3.0 MPa or less. From the perspective of more easily suppressing the detachment of functional components, its lower limit is more preferably 0.8 MPa or more, even more preferably 1.0 MPa or more, and even more preferably 1.3 MPa or more.

[0079] Here, M100 is a value confirmed by the following method: a predetermined rubber test piece (e.g., dumbbell-shaped No. 7, etc.) is collected from the housing, and a tensile test is performed on the rubber test piece at a tensile speed of 500 mm / min according to JIS K6251:2017, and the tensile stress (MPa: M100) at 100% elongation is measured at 100°C.

[0080] Furthermore, by adjusting the ratios of the components in the aforementioned configuration, the M100 can be set within the aforementioned range.

[0081] [Functional Components]

[0082] As a functional component of the housing of the tire of the present invention, there are no limitations as long as it has a sensor function that can detect tire information and has a contact surface shape that contacts the inner surface of the tire tread. For example, electronic components including various sensors, transmitters, receivers, control circuits, batteries, etc. can be cited. As tire information detected and obtained by the sensor function, examples include the internal temperature of the pneumatic tire, internal pressure (air pressure), and tread wear. The internal temperature and internal pressure can be measured using temperature sensors and pressure sensors. For tread wear detection, the following functional component is a preferred component: a sensor element using a piezoelectric element is provided on the contact surface, which detects the output voltage corresponding to the tire deformation during driving, and the tread wear is detected based on the output voltage. In other words, if the sensor function of this functional component is a sensor function using a piezoelectric element as the sensor element, it is more preferable from the viewpoint of tread wear detection. In addition, acceleration sensors and magnetic sensors can also be used.

[0083] [tire]

[0084] The tire of the present invention is shown, for example, as shown in the figure. Fig. 1The following embodiment, as shown, includes a tread portion 1 that extends in the circumferential direction of the tire and is in an annular shape, a pair of sidewall portions 2, 2 disposed on both sides of the tread portion 1 (both ends in the tire width direction), and a pair of bead portions 3, 3 disposed on the radially inner side of the pair of sidewall portions 2.

[0085] Furthermore, in this embodiment, at least one carcass layer 4 is provided between a pair of bead portions 3, 3. This carcass layer 4 includes multiple reinforcing cords extending radially along the tire, folding back from the inside to the outside of the tire around the bead core 5 disposed in each bead portion 3. A bead filler 6 with a triangular cross-section made of a rubber composition is disposed on the outer periphery of the bead core 5.

[0086] On the other hand, one or more (preferably multiple) belt layers 7 are disposed on the outer periphery of the carcass layer 4 at the tread portion 1. These belt layers 7 include multiple reinforcing cords (with embedded reinforcing cords) inclined in approximately the same direction relative to the tire circumference, and in the case of multiple (e.g., two) belt layers 7, the reinforcing cords are arranged in a manner that the reinforcing cords intersect each other between these layers. In the belt layer 7, the inclination angle of the reinforcing cords relative to the tire circumference is set, for example, in the range of 10° to 60° with a small angle. Steel cords are preferably used as the reinforcing cords of the belt layer 7. At least one belt cover layer 8, in which the reinforcing cords are arranged at an angle of, for example, less than 5° relative to the tire circumference, may also be disposed on the outer periphery of the belt layer 7 for the purpose of improving high-speed durability. Organic fiber cords such as nylon and aramid are preferably used as the reinforcing cords of the belt cover layer 8.

[0087] Furthermore, a tread rubber layer 15 is disposed on the tread portion 1. The tread rubber layer 15 includes at least a captread rubber layer 15A. In this embodiment, it is composed of two layers: the captread rubber layer 15A forming the tread surface of the tread portion 1 and an undertread rubber layer 15B located radially inside the captread rubber layer 15A. Additionally, the tread rubber layer 15 may also include: a ground tread made of conductive rubber exposed at the tire contact surface, and wing chips disposed at both ends of the captread rubber layer 15A in the tire width direction.

[0088] The components of the tire of the present invention (components constituting the various components such as the tread or the various layers such as the belt layer) are not particularly limited, and known components such as rubber components used to constitute the tire can be used arbitrarily.

[0089] In addition, there are no particular restrictions on tire size or purpose; tires can be made for various purposes, such as passenger cars, trucks and buses, and off-road vehicles.

[0090] The tire of the present invention has a housing with the aforementioned configuration on the inner surface of the tread portion of the tire in such an embodiment. The location of the housing is not particularly limited as long as it is on the inner surface of the tread portion, and it can also be located at a position other than the center point in the tire width direction of the inner surface of the tread portion.

[0091] Furthermore, the tire of the present invention is preferably a pneumatic tire. As the gas filling the pneumatic tire, for example, inert gases such as air, nitrogen, argon, and helium, as well as other gases, can be used.

[0092] Regarding the tire of the present invention (tire with functional components) with the above-described configuration, the sensor strength of the functional components provided on the inner surface of the tire tread is excellent, and the durability of the housing that houses the functional components is also excellent. In other words, even if repeated deformation occurs in the housing due to tire rotation, tread deformation, impact, etc. during tire operation, it is difficult for the housing to break (crack or separation of components, etc.).

[0093] The following describes embodiments of the present invention, but the present invention is not limited to the following embodiments, and various modifications can be made within the technical concept of the present invention.

[0094] Example

[0095] (Manufacturing and evaluation of tires with functional components)

[0096] Prepare a product having the composition shown in Table 1 below and as follows Figs. 2-3 Each of the containers shown is shaped as described above, and these containers are respectively placed inside a tire with a tire size of 235 / 55R17 96V. Fig. 1 As shown, the inner surface of the tire is bonded and fixed to its tread area with an adhesive, and functional components using piezoelectric elements as sensor elements are installed in the housing in such a way that the piezoelectric elements are arranged on the contact surface that contacts the inner surface of the tire, thus producing various tires with functional components.

[0097] Furthermore, for the tires with functional components obtained in Reference Example 1, Comparative Examples 1 to 6, and Examples 1 to 5, the rubber hardness (HS) of the housing and the tensile stress (M100) at 100% elongation were measured, and the sensing strength, detachment (difficulty of detachment), insertion ability, and durability of the housing were evaluated as follows.

[0098] <Rubber Hardness (HS)>

[0099] Dumbbell-shaped No. 7 rubber test pieces (thickness 1.0±0.1mm) were collected from the housing of each tire with functional components. The rubber hardness (HS) of the rubber test pieces was measured at 20°C using a Type A hardness tester (manufactured by Toyo Seiki Co., Ltd.) according to JIS K6253-3:2012.

[0100] The results are shown in the middle of Table 1 below.

[0101] <Tensile stress at 100% elongation (M100)>

[0102] Dumbbell-shaped No. 7 rubber test pieces (thickness 1.0±0.1mm) were collected from the housing of each tire with functional components. For the rubber test pieces, tensile tests were performed at a tensile speed of 500mm / min according to JIS K6251:2017. The tensile stress (MPa: M100) at 100% elongation was measured at 20℃ and 100℃.

[0103] These results are shown in the middle of Table 1 below.

[0104] <Sensing Intensity>

[0105] The obtained tires with functional components were assembled onto a wheel, the air pressure was set to 230 kPa, and the tires were driven in a drum at a speed of 30 km / h using a drum tester. The peak height of the waveform detected by the sensor element of the functional component was measured.

[0106] The results are shown in the lower paragraph of Table 1 below. Furthermore, the results are expressed using an exponent with the value of Reference Example 1 set to 100.

[0107] <Functional component detachment>

[0108] Each tire with functional components was assembled onto a wheel, with the air pressure set to 360 kPa. A drum tester was used to test the tires, accelerating them to 260 km / h in the first 10 minutes, and then increasing the speed by 10 km / h every 10 minutes. The speed at which the functional components detached from the housing was recorded as the test result.

[0109] The results are shown in the lower paragraph of Table 1 below. Furthermore, the results are expressed using an exponent with the value of Reference Example 1 set to 100.

[0110] <Insertive>

[0111] The ability to insert the same functional component into each of the housings that are joined and fixed to the inner surface of the tire was evaluated using ○×.

[0112] The results are shown in the lower paragraph of Table 1 below.

[0113] <Durability of the housing>

[0114] For each of the obtained tires with functional components, as a pretreatment, oxygen was sealed at 350 kPa and stored at 80 °C for 5 days. It was assembled on a wheel, and an indoor driving test was conducted using a drum tester under the condition of drum driving until 150 km / h at a driving condition starting from 81 km / h and increasing by 10 km / h every 2 hours. Also, a case where the housing was damaged was marked as ×, and a case where the housing was not damaged was marked as ○. In addition, the damage of the housing was defined as a state where the sensor function of the functional component could not be exerted due to rupture or detachment of the housing part of the housing.

[0115] The results are shown in the lower part of Table 1 below.

[0116] [Table 1]

[0117]

[0118] The details of each component, etc. in Table 1 above are as follows.

[0119] · NR: Natural rubber (SIR20, manufactured by PT. PANTJA SURYA)

[0120] · IIR: Butyl rubber (EXXON Bromobutyl 2255, manufactured by ExxonMobil chemical company)

[0121] · CB1: Carbon black (GPF, nitrogen adsorption specific surface area (N2SA): 35 m 2 / g, Nitron #GN: manufactured by Shin Nippon Carbon Co., Ltd.)

[0122] · CB2: Carbon black (HAF, nitrogen adsorption specific surface area (N2SA): 93 m 2 / g, Seast KH: manufactured by Tokai Carbon Co., Ltd.)

[0123] · Zinc oxide: Silver Ridge R (manufactured by Toho Zinc Co., Ltd.)

[0124] · Stearic acid: Bead stearic acid Tong (manufactured by Chiba Fatty Acids Co., Ltd.)

[0125] · Resin (resin component): C5 resin (Homogenizing Agent H40MSF, manufactured by Shandong Yanggu Huatai Chemical Co., Ltd.)

[0126] · Aromatic oil: Aromatic oil (Diana Process NH-70S, manufactured by Idemitsu Kosan Co., Ltd.)

[0127] • Sulfur: Salt Facility 5 (manufactured by Tsurumi Chemical Industry Co., Ltd.)

[0128] • Vulcanization accelerator: Nocuser DM-PO (manufactured by Ouchi Shinsei Chemical Co., Ltd.)

[0129] • Silica 1: Silica (ULTRASIL VN3GR, CTAB specific surface area 170m²) 2 / g: Made by Evonik)

[0130] These results show that by setting the composition to include a predetermined amount of carbon black in a housing consisting of a rubber component containing 65% or more IIR and 35% or less NR, the sensing strength, detachment, and insertion properties of the functional component are all improved, and the durability of the housing is also improved (Examples 1-5). On the other hand, it is also shown that when the proportion of butyl rubber in the rubber component or the content of carbon black is low, the sensing strength and detachment properties of the functional component decrease (Comparative Examples 1, 2, 4), and when the carbon black content is high, the insertion properties of the functional component and the durability of the housing decrease (Comparative Examples 3, 6). In addition, when silica is used instead of carbon black, the insertion properties of the functional component decrease (Comparative Example 5).

[0131] Then, using the same method as described above, a product with the composition shown in Table 2 below is prepared and as follows... Figs. 2-3 Each of the containers shown is shaped as described above, and these containers are respectively placed inside a tire with a tire size of 235 / 55R17 96V. Fig. 1 The inner surface of the tire is joined and fixed to its tread as shown, and the same functional components using piezoelectric elements as sensor elements are installed in the housing to produce various tires with functional components.

[0132] Furthermore, for the tires with functional components obtained in Reference Example 2, Comparative Example 7, and Examples 9-18, the tensile stress (M100) of the housing at 100% elongation at 100°C and the sensing strength of the functional components were measured using the same method as described above. Moreover, regarding the durability of the housing, in the same indoor driving test as described above, the test was conducted under the condition of increasing the speed by 10 km / h every 2 hours starting from 81 km / h, and the speed at which the housing broke was taken as the test result.

[0133] The results are shown in the middle and lower sections of Table 2 below. Furthermore, the results for the sensing intensity of the functional components and the durability of the housing are expressed using an index with the value of Reference Example 2 set to 100.

[0134] [Table 2]

[0135]

[0136] For details regarding the components in Table 2 above, the components that are repeated in Table 1 are the same as those in Table 1, and the components not recorded in Table 1 are described below.

[0137] ·CB3: Carbon black (FEF, nitrogen adsorption specific surface area (N2SA): 42m²) 2 / g, Seast SO: manufactured by Tokai Carbon Company)

[0138] • Silica 2: Silica (ULTRASIL 115GR, CTAB specific surface area 114m²) 2 / g: Made by Evonik)

[0139] ·Clay: T Clay ( (Company)

[0140] • Calcium carbonate: Heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd.)

[0141] Talc: MH (Japan Talc Company)

[0142] • Silane coupling agent: Si69 (manufactured by Evonik)

[0143] These results show that the same effect can be achieved when a predetermined amount of silica, clay, calcium carbonate, and talc are used as white fillers in a housing composed of a rubber component containing more than 70% by mass of IIR and less than 30% by mass of NR, together with carbon black (Examples 9-18). On the other hand, when the carbon black content and the combined amount of carbon black and silica are low, the sensing intensity of the functional component decreases (Comparative Example 7).

[0144] This application claims priority based on Japanese Application Special Purpose 2023-196858, filed on November 20, 2023, the entire disclosure of which is incorporated herein by reference.

[0145] Explanation of reference numerals in the attached figures

[0146] 100 tires

[0147] 1. Fetal face

[0148] 2. Side of the tire

[0149] 3. Bead area

[0150] 4. Fetal body layers

[0151] 5. Tire bead core

[0152] 6. Bead filling

[0153] 7. Belt layer

[0154] 8. Belt Covering Layer

[0155] 11 Tire circumferential groove

[0156] 12. Tire inner surface of the tread

[0157] 20 Functional Components

[0158] 21. Contact surface (piezoelectric element)

[0159] 30 containment bodies

[0160] 31 Base

[0161] 32 Sidewall

[0162] 33 Containment Department

Claims

1. A tire, wherein the inner surface of the tread portion has a housing for accommodating functional components. The functional component has at least a contact surface that contacts the inner surface of the tire and a sensor function for detecting tire information. The containment body is composed of a rubber component containing more than 60% by mass of butyl rubber (IIR) and less than 40% by mass of natural rubber (NR), and also contains 40 to 82 parts by mass of carbon black relative to 100 parts by mass of the rubber component.

2. The tire according to claim 1, The containment contains a total of 40 to 85 parts by mass of the carbon black and white filler relative to 100 parts by mass of the rubber component.

3. The tire according to claim 2, The white filler is selected from one or more of silica, talc, mica, clay and calcium carbonate.

4. The tire according to any one of claims 1 to 3, The average nitrogen adsorption specific surface area (N2SA) of the carbon black is 50 m². 2 / g or less.

5. The tire according to any one of claims 1 to 3, The tensile stress (M100) of the containment body at 100% elongation at 100°C is less than 5.0 MPa.

6. The tire according to any one of claims 1 to 3, The housing is fixed to the inner surface of the tire.

7. The tire according to claim 6, The housing is fixed to the inner surface of the tire by an adhesive.

8. The tire according to any one of claims 1 to 3, The sensor function of the functional component is a sensor function that uses a piezoelectric element as the sensor element.

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