Patents Assigned to Bridgestone Corporation
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Patent number: 11701921Abstract: Provided is a rubber composition that achieves both wet performance and low loss property while delivering excellent dry handling performance. A rubber composition comprises: a rubber component; and a styrene-alkylene block copolymer, wherein a total styrene content of the styrene-alkylene block copolymer is 30 mass % or more.Type: GrantFiled: June 12, 2020Date of Patent: July 18, 2023Assignee: BRIDGESTONE CORPORATIONInventors: Misa Aoki, Seiichi Tahara, Takuya Ogasawara
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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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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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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: 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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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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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: 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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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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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: 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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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: 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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Patent number: 11667774Abstract: A process for preparing a rubber vulcanizate, the process comprising (i) providing a vulcanizable composition of matter including a sulfur-based curative, zinc oxide, and a eutectic solvent; and (ii) heating the vulcanizable composition to thereby effect vulcanization.Type: GrantFiled: October 31, 2018Date of Patent: June 6, 2023Assignee: Bridgestone CorporationInventors: Erin Sheepwash, Julia A. Dart, Michael C. Davis
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Publication number: 20230166562Abstract: A pneumatic radial tire for aircraft in the present disclosure includes a bead core formed by a pair of cable beads embedded in a respective pair of bead portions, a pair of bead fillers respectively arranged outward in a tire radial direction from the pair of bead cores, and a carcass formed by two or more carcass plies that extend toroidally between the pair of bead cores. In a tire widthwise cross-sectional view, an end of a carcass ply, among the two or more carcass plies, closest to the bead filler in a region inward in a tire width direction from the bead filler is located in a region corresponding to 45° to 90° inward in the tire width direction when 0° is defined as outward in the tire radial direction from a center of the bead core.Type: ApplicationFiled: December 17, 2020Publication date: June 1, 2023Applicant: BRIDGESTONE CORPORATIONInventors: Gaku OGAWA, Takuya MATSUMOTO
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Patent number: 11662272Abstract: A method for efficiently estimating a degree of wear of a tire in which a normalized deformation speed index is set as a wear measure. The normalized deformation speed index is obtained by normalizing an index of a deformation speed near an edge of a tire contact patch, the index being calculated from magnitudes of peaks appearing in a radial acceleration waveform obtained by differentiating tire radial acceleration detected by an acceleration sensor. The degree of wear of the tire is estimated using the wear measure, the ground contact time ratio, a worn tire approximate formula and an approximate formula when a tire is new, which have been obtained in advance and each represents a relationship between the wear measure and the ground contact time ratio obtained by running a plurality of tires having tire sizes different from each other.Type: GrantFiled: September 26, 2019Date of Patent: May 30, 2023Assignee: BRIDGESTONE CORPORATIONInventor: Kenta Nishiyama
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Patent number: 11654716Abstract: An object of the present disclosure is to provide a non-pneumatic tire having a small temperature dependence of ride comfort, providing a good ride comfort over a wide temperature range, and having an excellent durability. A solution thereto is a non-pneumatic tire (1) using a resin composition for a framework member, the resin composition having a bending modulus of elasticity at ?20° C. according to ISO 178 of 1600 MPa or less, and a bending modulus of elasticity at 60° C. according to ISO 178 of 150 MPa or more.Type: GrantFiled: May 8, 2020Date of Patent: May 23, 2023Assignee: BRIDGESTONE CORPORATIONInventor: Sinichi Eguchi
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Patent number: D990411Type: GrantFiled: August 30, 2021Date of Patent: June 27, 2023Assignee: BRIDGESTONE CORPORATIONInventors: Kohei Sahashi, Shintaro Hayashi
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Patent number: D991151Type: GrantFiled: May 27, 2021Date of Patent: July 4, 2023Assignee: BRIDGESTONE CORPORATIONInventor: Shiho Kamada
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Patent number: D991153Type: GrantFiled: July 6, 2021Date of Patent: July 4, 2023Assignee: BRIDGESTONE CORPORATIONInventor: Yoko Itai
