Patents Assigned to Bridgestone Corporation
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Publication number: 20230271460Abstract: A pneumatic tire according to the present disclosure includes a pair of bead cores, a carcass ply including a main body positioned between the bead cores and a turn-up portion connected to the main body and formed by turning up around each bead core from inside to outside in a tire width direction, a cover rubber covering the main body of the carcass ply and an outer side of the turn-up portion in the tire width direction and configuring a tire outer surface, and a reinforcement layer located inward from the tire outer surface of the cover rubber and covering an outer side, in the tire width direction, of at least a portion of the turn-up portion of the carcass ply. The reinforcement layer is configured by a non-woven fabric including metal fibers or a rubber sheet material having metal fibers embedded therein.Type: ApplicationFiled: January 8, 2021Publication date: August 31, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Toshiya MIYAZONO
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Publication number: 20230272249Abstract: Provided is a thin film with good durability that is easy to handle during storage and use. The film contains, as a rubber component, at least a copolymer having a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit, and having a proportion of a butylene unit of 0 mol %, where a filler content is 15 parts by mass or less with respect to 100 parts by mass of the rubber component, no cross-linking agent is contained, and the thickness is 300 ?m or less.Type: ApplicationFiled: July 20, 2021Publication date: August 31, 2023Applicant: BRIDGESTONE CORPORATIONInventors: Takuya OZAKI, Shinichiro SUGI, Masahiro HOJO
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Publication number: 20230271452Abstract: A pneumatic tire provided with a tread having a plurality of main grooves extending in a tire circumferential direction and a plurality of land portions demarcated by the main grooves, in which the tread includes: a first rubber layer located on an inner side in a tire width direction and a second rubber layer which is in contact with the first rubber layer and located on an outer side in the tire width direction of the first rubber layer, and in which, in a cross-sectional view in the width direction, a boundary between the first rubber layer and the second rubber layer is inclined relative to a tire radial direction, and one end portion of the boundary terminates at a groove wall on the inner side in the tire width direction of the main groove.Type: ApplicationFiled: October 8, 2021Publication date: August 31, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Nobuyuki ISHIHARA
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Publication number: 20230264446Abstract: A tire production device includes a supply unit to supply a ribbon strip molded into a ribbon shape; and a tire molding unit to stick the ribbon strip onto an outer periphery of a drum having an inner peripheral shape of a tire, while rotating the drum, in which the supply unit has a sticking position at which the ribbon strip is stuck onto the outer periphery of the drum. The tire molding unit includes: the drum with a horizontal rotation axis; a turning table that turns the drum around a vertical axis while maintaining a horizontal rotation axis of the drum; and a parallel movement mechanism provided on the turning table to move the drum in parallel along a horizontal surface set to the turning table, and in which the rotation axis extends in a tangential direction centered on the axis line about which the turning table turns.Type: ApplicationFiled: July 9, 2021Publication date: August 24, 2023Applicant: BRIDGESTONE CORPORATIONInventors: Satoshi IYANAGI, Toshiki NAKAMURA
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Publication number: 20230265226Abstract: A laminated body 10 includes: a layer (C) 12 consisting of a composition (c) containing a copolymer that contains a conjugated diene unit and a non-conjugated olefin unit and contains 0 mol % of a butylene unit; and a layer (R) 14 consisting of a composition (r) containing an olefin-based resin, in which the layer (C) 12 is adjacent to the layer (R) 14. The laminated body 10 is excellent in a mechanical strength and impact resistance, and is easy to repair.Type: ApplicationFiled: April 28, 2021Publication date: August 24, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Shojiro KAITA
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Publication number: 20230241928Abstract: A tire according to the present disclosure includes, on the tire outer surface, a first region including an uneven surface formed by a convex portion arranged throughout the first region, and a second region including an uneven surface formed by a plurality of ridges arranged in parallel throughout the second region, the second region being arranged adjacent to the first region. The minimum separation distance between apices of the convex portion in the first region is shorter than the minimum separation distance between apices of two adjacent ridges in the second region.Type: ApplicationFiled: July 8, 2021Publication date: August 3, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Sotaro IWABUCHI
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Publication number: 20230241917Abstract: Provided is a pneumatic tire that has excellent durability and achieves both high load capacity and space-saving properties. This disclosure provides a pneumatic tire to be mounted on a vehicle, which includes a tread in contact with a road surface and a belt layer provided inside the tread in the tire radial direction, where the pneumatic tire has an outer diameter of 350 mm or more and 600 mm or less, and when the rim width of a rim wheel assembled to the pneumatic tire is defined as RW, and the tire cross-sectional width of the pneumatic tire is defined as SW, they satisfy the relationship of 0.78?RW/SW?0.88, and the pneumatic tire uses a rubber composition containing a rubber component containing 50% by mass or more of natural rubber and/or synthetic isoprene rubber, and syndiotactic 1,2-polybutadiene.Type: ApplicationFiled: May 27, 2021Publication date: August 3, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Norihisa KANO
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Publication number: 20230220187Abstract: Provided is a pneumatic tire that has excellent fuel efficiency and rubber strength and combines high load capacity and space saving. A pneumatic tire mounted on a vehicle, comprises: a tread configured to come into contact with a road surface; and a belt layer located on an inner side of the tread in a tire radial direction, wherein an outer diameter of the pneumatic tire is 350 mm or more and 600 mm or less, the following relationship: 0.78?RW/SW?0.88 is satisfied, where RW is a rim width of a rim wheel to be attached to the pneumatic tire and SW is a tire section width of the pneumatic tire, and a rubber composition that contains: a rubber component containing a diene-based rubber; and a mercaptocarboxylic acid compound is used in the pneumatic tire.Type: ApplicationFiled: May 27, 2021Publication date: July 13, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Tomoyuki KOSAI
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Publication number: 20230219375Abstract: A tire includes a first circumferential main groove 11 and a second circumferential main groove 12 in a tread surface 1. A resonator 21 is formed in an intermediate land portion 20 partitioned between the first circumferential main groove and the second circumferential main groove. The resonator has an auxiliary groove 211 whose both ends terminate within the intermediate land portion. The groove depths D1 of the first and second circumferential main grooves are 50% or less of the groove widths W2 of the first and second circumferential main grooves, respectively. The groove width W3 of the auxiliary groove of the resonator is 80% or less of the groove depth D1 of the first circumferential main groove.Type: ApplicationFiled: May 6, 2021Publication date: July 13, 2023Applicant: BRIDGESTONE CORPORATIONInventors: Yoshiki NAKATA, Mayuko KARASAWA
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Patent number: 11685191Abstract: Provided is a steel cord for rubber article reinforcement which has excellent corrosion resistance and productivity without deterioration of adhesion with rubber. A steel cord (1) for rubber article reinforcement, in which plural steel filaments (2) are twisted together, includes: a core having at least one core filament (2c); and a sheath having at least one sheath layer formed by twisting at least one sheath filament (2s) around the core. In this steel cord (1), brass plating is performed on the steel filaments (2) and zinc plating is further performed on the outer circumference of the brass plating of the core filament (2c), and the steel filaments (2) have a diameter d of 0.1 mm to 0.6 mm.Type: GrantFiled: September 9, 2019Date of Patent: June 27, 2023Assignee: BRIDGESTONE CORPORATIONInventor: Nobuhiro Ando
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Publication number: 20230191843Abstract: A pneumatic tire according to the present disclosure includes a ply including a plurality of cords arranged in parallel to each other, a cover rubber covering the ply and configuring a tire outer surface, and a reinforcement layer that, at a position of a cut edge of the ply, covers the cut edge of the ply on one side or both sides in a ply thickness direction. The reinforcement layer is configured by a non-woven fabric comprising metal fibers or a rubber sheet material having metal fibers embedded therein.Type: ApplicationFiled: January 8, 2021Publication date: June 22, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Toshiya MIYAZONO
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Publication number: 20230192984Abstract: A bladder for tire vulcanizing containing a crosslinked fluoroelastomer obtained by peroxide-crosslinking a fluoroelastomer composition including a peroxide-crosslinkable fluoroelastomer (A), a carbon black (B), and a peroxide cross-linking agent (C), wherein the crosslinked fluoroelastomer has a hardness at 25° C. of 60 to 90, a number of foreign particles selected from the group consisting of lumps of carbon and carbon grit having an aspect ratio of 1.1 or less and a Heywood diameter of 5 ?m or more present on a fracture surface obtained by tensile fracture of the crosslinked fluoroelastomer at 170° C. is 10/mm2 or less, and the fluoroelastomer (A) includes a vinylidene fluoride (VdF) fluoroelastomer.Type: ApplicationFiled: February 10, 2023Publication date: June 22, 2023Applicants: DAIKIN INDUSTRIES, LTD., BRIDGESTONE CORPORATIONInventors: Masashi ARAI, Daisuke OHTA, Akinori UEDA, Yasuhiro ODA, Junichi ORIDE
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Patent number: 11679628Abstract: A tire includes an annular tire structural member in which a resin-covered cord, configured by covering a reinforcing cord with a resin including a protrusion formed on a side face, is wound in a spiral shape with the resin at one portion of the resin-covered cord integrally bonded to the resin at another mutually adjacent portion of the resin-covered cord.Type: GrantFiled: October 26, 2018Date of Patent: June 20, 2023Assignee: BRIDGESTONE CORPORATIONInventors: Kentaro Mizotani, Tomohisa Okawa
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Publication number: 20230183530Abstract: Provided is an adhesive composition for organic fiber cords containing (A) synthetic rubber latex having unsaturated diene, (B) gelatin, and (C) an aqueous compound having a (thermal dissociative blocked) isocyanate group and containing no resorcin or formaldehyde, which has the following effects: (1) causing little damage to the environment by using no resorcin or formaldehyde, (2) in a process of coating an organic fiber cord with the adhesive composition for organic fiber cords and drying and heat curing, it is possible to suppress the adhesion of the adhesive composition for organic fiber cords to a roller or the like, thereby achieving good operability, and (3) achieving good adhesion between an organic fiber cord and a coated rubber composition.Type: ApplicationFiled: April 23, 2021Publication date: June 15, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Masaaki NAKAMURA
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Publication number: 20230183456Abstract: A rubber composition contains a rubber component containing at least one selected from the group consisting of an isoprene rubber, a butadiene rubber, and a styrene-butadiene copolymer rubber, and a compound (1) represented by the following general formula (1). By using the rubber composition, it is possible to produce a rubber product having an excellent balance between a low strain hysteresis loss and a high strain hysteresis loss. [R1 and R2 in the general formula (1) each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 5 to 20 carbon atoms.Type: ApplicationFiled: April 12, 2021Publication date: June 15, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Tomoyuki KOSAI
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Patent number: 11673430Abstract: Provided is a tire including: a decorative portion that is formed on an outer surface of the tire and has a base surface; and a pattern region that is provided at the decorative portion and includes plural projections projecting from the base surface and formed at an interval of from more than 0.1 mm to 1.0 mm, the plural projections having a height of from 0.1 mm to 1.0 mm, in which at least in the pattern region, the plurality of projections is inclined in one direction with respect to a normal line perpendicular to the base surface.Type: GrantFiled: December 5, 2018Date of Patent: June 13, 2023Assignee: BRIDGESTONE CORPORATIONInventors: Sotaro Iwabuchi, Takayuki Fukunaga
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Publication number: 20230173850Abstract: A tire includes a first circumferential main groove 11 and a second circumferential main groove 12 in a tread surface 1. A resonator 21 is formed in an intermediate land portion 20 partitioned between the first circumferential main groove and the second circumferential main groove. The resonator has an auxiliary groove 211 whose both ends terminate within the intermediate land portion. The groove depths D1 of the first and second circumferential main grooves are 50% or less of the groove widths W2 of the first and second circumferential main grooves, respectively. The groove depth D3 of the auxiliary groove of the resonator is 70% or more of the groove depth D1 of the first circumferential main groove.Type: ApplicationFiled: May 6, 2021Publication date: June 8, 2023Applicant: BRIDGESTONE CORPORATIONInventors: Yoshiki NAKATA, Mayuko KARASAWA
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Publication number: 20230174751Abstract: Provided is a rubber composition having excellent wear resistance while having good low heat generating properties. The rubber composition contains a rubber component and carbon black, where the rubber component contains natural rubber and butadiene rubber, a proportion of the natural rubber is less than 80% by mass, a content of the carbon black is 40 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the rubber component, and when carbon blacks A, B and C are defined under predetermined conditions, the carbon black contains at least the carbon black A and the carbon black B, and a content of the carbon black C is 0 or the smallest among the carbon blacks A to C.Type: ApplicationFiled: March 10, 2021Publication date: June 8, 2023Applicant: BRIDGESTONE CORPORATIONInventors: Kei MITO, Toru MIYAZAKI
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Publication number: 20230174833Abstract: The present disclosure provides: an adhesive composition capable of realizing good adhesion even when neither resorcin nor formalin is included therein; and a rubber-organic fiber cord composite and a tire, which are excellent in adhesion between rubber and organic fiber cords and make a low impact on the environment. Specifically, the present invention provides an adhesive composition for an organic fiber cord, comprising therein: an epoxy compound (A); a compound (B) having an amide group and an amino group per molecule; and rubber latex (C). Further, the present disclosure provides a rubber-organic fiber cord composite, comprising a rubber member and an organic fiber cord, wherein at least a portion of the organic fiber cord is coated with the adhesive composition described above.Type: ApplicationFiled: April 27, 2021Publication date: June 8, 2023Applicant: BRIDGESTONE CORPORATIONInventors: Shingo ONOUE, Masaaki KAKAMURA
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Patent number: D990411Type: GrantFiled: August 30, 2021Date of Patent: June 27, 2023Assignee: BRIDGESTONE CORPORATIONInventors: Kohei Sahashi, Shintaro Hayashi