Patent application number | Description | Published |
20110056604 | POLYMER LAMINATE AND PNEUMATIC TIRE USING THE SAME AS INNER LINER - An object of the present invention is to provide a polymer laminate that has a small thickness and is excellent in air permeation resistance and adhesion with an adjacent rubber, and a pneumatic tire using the same as an inner liner. A polymer laminate includes a first layer having a thickness of 0.05 mm to 0.6 mm made of a styrene-isobutylene-styrene triblock copolymer, and a second layer containing at least one of a styrene-isoprene-styrene triblock copolymer and a styrene-isobutylene diblock copolymer, and a second layer have a thickness of 0.01 mm to 0.3 mm. | 03-10-2011 |
20110056612 | Method for Producing Polymer Sheet for Inner Liner and Method for Producing Pneumatic Tire - The present invention provides a polymer sheet for an inner liner and a method for producing a pneumatic tire, which do not cause an air-in phenomenon between an inner liner and an insulation rubber or a carcass rubber in the vulcanization step, and also can prevent adhesion between the inner liner and a bladder. The method for producing a polymer sheet for an inner liner includes the steps of preparing an unvulcanized polymer sheet made of a polymer mixture containing 99 to 60% by mass of a styrene-isobutylene-styrene triblock copolymer, and 1 to 40% by mass of a polyamide-based polymer containing polyamide in the molecular chain and having a Shore D hardness of 70 or less, and at least one of the steps of coating one surface of the unvulcanized polymer sheet with a water-soluble paint 2 to 5 times, and coating with a mold-releasing rubber in a thickness of 0.001 mm to 0.1 mm.f. | 03-10-2011 |
20110060082 | POLYMER COMPOSITION AND PNEUMATIC TIRE - An object of the present invention is to provide a polymer composition that can decrease the thickness of an inner liner while maintaining air permeation resistance. The polymer composition of the present invention includes 0.1 to 50 parts by mass of an organic derivative of a clay mineral based on 100 parts by mass of a polymer mixture containing 99 to 60% by mass of a styrene-isobutylene-styrene triblock copolymer and 1 to 40% by mass of a polyamide-based polymer that contains polyamide in the molecular chain and has a Shore D hardness of 70 or less. | 03-10-2011 |
20110068508 | METHOD FOR PRODUCING PNEUMATIC TIRE - An object of the present invention is to provide a method for producing a pneumatic tire, that does not cause an air-in phenomenon between an inner liner and an insulation or carcass by preventing adhesion of an inner liner to a bladder. The method for producing a pneumatic tire according to the present invention includes the following steps. A green tire using, as an inner liner, a polymer composition in which a polymer component contains 100 to 60% by mass of a styrene-isobutylene-styrene triblock copolymer and 0 to 40% by mass of a polyamide-based polymer that contains polyamide in the molecular chain and has a Shore D hardness of 70 or less is prepared. The green tire is mounted in a mold and vulcanized while being pressurized by a bladder. The resultant vulcanized tire is cooled at 10 to 120° C. for 10 to 300 seconds. | 03-24-2011 |
20110077357 | POLYMER COMPOSITION FOR INNER LINER AND PNEUMATIC TIRE USING THE SAME - An object of the present invention is to provide a polymer composition for an inner liner, that is excellent in air permeation resistance and adhesion with an adjacent rubber, and a pneumatic tire using the same. In the polymer composition for an inner liner, a polymer component contains 99 to 50% by mass of a styrene-isobutylene-styrene triblock copolymer, and at least one of a styrene-isoprene-styrene triblock copolymer and a styrene-isobutylene diblock copolymer in a total amount of 1 to 50% by mass. | 03-31-2011 |
20110178235 | RUBBER COMPOSITION FOR INNER LINER AND PNEUMATIC TIRE - The present invention provides a rubber composition for an inner liner, which can achieve both excellent low heat build-up and high flex crack growth resistance while having processability excellent enough to eliminate the need for mastication, and further has good air impermeability, and also provides a pneumatic tire produced using the rubber composition. The present invention relates to a rubber composition for an inner liner, including: a rubber component that contains a modified natural rubber with a phosphorus content of 200 ppm or less, and carbon black and/or a white filler. | 07-21-2011 |
20110184118 | RUBBER COMPOSITION FOR SIDEWALL, INSULATION OR BREAKER CUSHION, PRODUCTION METHOD THEREOF, AND PNEUMATIC TIRE - The present invention provides a rubber composition for a sidewall, an insulation, or a breaker cushion, which can achieve both excellent fuel economy (low heat build-up) and high flex crack growth resistance while having processability excellent enough to eliminate the need for mastication, and also provides a pneumatic tire produced using the rubber composition. The present invention relates to a rubber composition for a sidewall, an insulation, or a breaker cushion, including: a rubber component that contains a modified natural rubber with a phosphorus content of 200 ppm or less; and carbon black and/or a white filler. | 07-28-2011 |
20110315293 | METHOD FOR PRODUCING PNEUMATIC TIRE AND PNEUMATIC TIRE - A method for producing a pneumatic tire in which an air-in phenomenon between an inner liner and a carcass is avoided by preventing adhesion of the inner liner to a bladder includes the following steps. A green tire using, as an inner liner, a polymer laminate including a first layer having a thickness of 0.05 mm to 0.6 mm made of a styrene-isobutylene-styrene triblock copolymer, and a second layer composed of at least one of a second A layer made of a styrene-isoprene-styrene triblock copolymer and a second B layer made of a styrene-isobutylene diblock copolymer, the second layer having a thickness of 0.01 mm to 0.3 mm, is prepared. The green tire is mounted in a mold for vulcanization with pressurization by the bladder to obtain a vulcanized tire. The vulcanized tire is cooled at 50 to 120° C. for 10 to 300 seconds. | 12-29-2011 |
20120006459 | POLYMER SHEET FOR INNER LINER AND PNEUMATIC TIRE USING THE SAME - Provided is a pneumatic tire which exhibits excellent performance in flex crack growth resistance, rolling resistance and static air pressure drop, and includes an SIBS layer containing a styrene-isobutylene-styrene triblock copolymer as a polymer sheet used for an inner liner. The SIBS layer has a thickness more than or equal to 0.05 mm and less than or equal to 0.6 mm. The SIBS layer contains more than or equal to 0.5% by mass and less than or equal to 40% by mass of a polymer obtained by polymerization of a monomer unit having 4 carbon atoms. | 01-12-2012 |
20120024447 | POLYMER SHEET FOR INNER LINER, POLYMER LAMINATE FOR INNER LINER, AND PNEUMATIC TIRE - A pneumatic tire is provided which includes a polymer sheet for an inner liner composed of a polymer composition including: a polymer component containing more than or equal to 5% by mass and less than or equal to 40% by mass of a styrene-isobutylene-styrene triblock copolymer and more than or equal to 60% by mass and less than or equal to 95% by mass of a rubber component of at least one kind selected from the group consisting of natural rubber, isoprene rubber, and butyl rubber; and more than or equal to 0.1 part by mass and less than or equal to 5 parts by mass of sulfur with respect to 100 parts by mass of the polymer component. The pneumatic tire has sufficient tackiness before vulcanization and vulcanization adhesiveness between the inner liner and a member adjacent thereto, and exhibits excellent air permeation resistance. | 02-02-2012 |
20130139941 | PNEUMATIC TIRE AND METHOD FOR MANUFACTURING THE SAME, AND TIRE VULCANIZING BLADDER - A method for manufacturing a pneumatic tire uses a tire vulcanizing bladder including a plurality of vent lines, and is characterized in that the pneumatic tire includes an inner liner on an inner surface thereof, the inner liner has an SIBS layer containing a styrene-isobutylene-styrene triblock copolymer, the SIBS layer has a thickness of more than or equal to 0.05 mm and less than or equal to 0.6 mm, the SIBS layer contains more than or equal to 0.5% by mass and less than or equal to 40% by mass of a polymer obtained by polymerization of a monomer unit having 4 carbon atoms, and the vent lines each include a first vent line at a part corresponding to from a tire bead toe part to a tire buttress part, and a second vent line at a part corresponding to from the tire buttress part to a tire crown part. | 06-06-2013 |
20130192745 | STRIP, METHOD FOR MANUFACTURING THE SAME, AND METHOD FOR MANUFACTURING PNEUMATIC TIRE - A strip of a thermoplastic elastomer to be wound spirally on a cylindrical drum for forming an inner liner for a tire having a shape close to a finished sectional shape is provided. The strip is formed of composite layers of (A) a first layer made of a styrene-isobutylene-styrene triblock copolymer and (B) a second layer containing at least one of a styrene-isoprene-styrene triblock copolymer and a styrene-isobutylene diblock copolymer. The strip further has a strip main body and ear portions arranged on opposite sides thereof. The strip main body has a thickness (T | 08-01-2013 |
20130199687 | PNEUMATIC TIRE - A pneumatic tire includes an inner liner disposed inwardly in the tire relative to a carcass ply bridged between a pair of bead portions, the inner liner being formed of a first layer disposed inwardly in the tire, and a second layer disposed in contact with a rubber layer of the carcass ply, the first layer being a thermoplastic elastomer composition mainly containing a styrene-isobutylene-styrene block copolymer, the second layer being a styrene-based thermoplastic elastomer composition, (a) at least one of the thermoplastic elastomer compositions of the first and second layers containing a tackifier by 0.1 part by mass to 100 parts by mass relative to 100 parts by mass of a thermoplastic elastomer component, or (b) the second layer containing the styrene-isobutylene-styrene block copolymer by 10 mass % to 80 mass % relative to a thermoplastic elastomer component thereof. | 08-08-2013 |
20130220519 | METHOD FOR MANUFACTURING PNEUMATIC TIRE - A method for manufacturing a pneumatic tire including: (a) an assembly step of bonding the inner liner and an unvulcanized rubber sheet with end portions thereof in a width direction being displaced from each other in the range of 50 mm to 500 mm in the width direction to manufacture a laminate; (b) a cutting step of cutting the laminate to have a constant length corresponding to a width of a drum to manufacture a cut sheet; and (c) a joining step of winding the cut sheet on entire circumference of the drum such that a cut surface thereof extends in a circumferential direction of the drum and the inner liner is disposed on an inner surface side, and joining the end portions of the inner liner and joining the end portions of the unvulcanized rubber sheet. | 08-29-2013 |
20130230697 | STRIP, METHOD FOR MANUFACTURING THE SAME, AND METHOD FOR MANUFACTURING PNEUMATIC TIRE - The strip is formed of a single layer including a first layer arranged in a tire innermost layer or composite layers of the first layer and a second layer disposed adjacently to a carcass ply and made of a thermoplastic elastomer composition. The first layer is a thermoplastic elastomer composition containing a styrene-isobutylene-styrene block copolymer and a tackifier, a butyl-based rubber and a natural rubber. The strip has a strip main body having a thickness (T | 09-05-2013 |
20130248085 | STRIP, METHOD FOR MANUFACTURING THE SAME, AND METHOD FOR MANUFACTURING PNEUMATIC TIRE - The present invention relates to a ribbon-shaped strip used for an inner liner and a method for manufacturing the strip. The strip is to be wound on an outer circumferential surface of a tire molding drum or a core body to form an inner liner. The strip has an inner layer disposed inwardly in a tire and an outer layer disposed outwardly in the tire. The inner layer and the outer layer are bonded to each other with their ends offset by 0.5 mm to 30 mm in a widthwise direction. At least one layer of the inner layer is formed of an elastomer composition containing a styrene-isobutylene-styrene block copolymer. At least one layer of the outer layer is formed of a thermoplastic elastomer composition. | 09-26-2013 |
20140027042 | METHOD FOR MANUFACTURING PNEUMATIC TIRE - Provided is a method for manufacturing a pneumatic tire, including the steps of preparing a polymer layer stack formed of a first layer made of a styrene-isobutylene-styrene triblock copolymer and having a thickness of 0.05 mm to 0.6 mm and a second layer made of an epoxidized styrene-butadiene-styrene triblock copolymer and having a thickness of 0.01 mm to 0.3 mm, molding a raw tire with the polymer layer stack bonded to the inner side of the tire as an inner liner, arranging the raw tire in a mold and vulcanizing the tire under pressure from a bladder, and cooling a vulcanized tire at 50° C. to 120° C. for 10 seconds to 300 seconds. | 01-30-2014 |
20140048192 | PNEUMATIC TIRE - Provided is a pneumatic tire including an inner liner on a tire inner side of a carcass ply laid between a pair of bead parts, the inner liner having a first layer made of a first polymer composition, the first polymer composition containing not less than 0.5 parts by mass and not more than 70 parts by mass of at least one selected from the group consisting of liquid polyisoprene, a maleic anhydride adduct of liquid polyisoprene, and a maleic acid monomethyl ester adduct of liquid polyisoprene, relative to 100 parts by mass of a styrene-isobutylene-styrene triblock copolymer. | 02-20-2014 |
20140090763 | PNEUMATIC TIRE - Provided is a pneumatic tire including an inner liner disposed inwardly in the tire relative to a carcass ply bridged between a pair of bead portions. The inner liner is formed of a first layer disposed inwardly in the tire and a second layer disposed to be in contact with a rubber layer of the carcass ply. The first layer is a thermoplastic elastomer composition containing a thermoplastic elastomer containing at least one of a styrene-isobutylene-styrene block copolymer and an SIBS modified copolymer having a styrene block moiety modified with acid chloride or acid anhydride having an unsaturated bond. The thermoplastic elastomer composition also contains at least one of an ultraviolet absorber and an antioxidant. The second layer is a thermoplastic elastomer composition containing at least one of a styrene-isoprene-styrene block copolymer and a styrene-isobutylene block copolymer. | 04-03-2014 |
20140138005 | PNEUMATIC TIRE - The inner liner is composed of a polymer layer stack including a first layer containing an SIBS and a second layer containing at least one of an SIS and an SIB. At least one of the first layer and the second layer is a polymer composition containing one of a C4 polymer obtained by polymerizing a monomer unit having 4 carbon atoms, a layered clay mineral with an organic compound intercalated therein and at least one kind of rubber component selected from the group consisting of a natural rubber, an isoprene rubber and a butyl rubber. The second layer is arranged to come into contact with a rubber layer of the carcass ply. The inner liner has a thickness Ge at a shoulder position Pe exceeding 100% and being less than or equal to 500% of a thickness Gc at a crown central position Pc. | 05-22-2014 |
20140190619 | STRIP, METHOD FOR MANUFACTURING THE SAME, AND METHOD FOR MANUFACTURING PNEUMATIC TIRE - The present invention is a strip of a thermoplastic elastomer composition to be wound spirally on a cylindrical drum to form an inner liner for a tire. The strip is composed of a layer stack of a first layer made of a thermoplastic elastomer composition containing 0.1 part by mass to 50 parts by mass of an organic derivative of clay mineral relative to 100 parts by mass of a styrene-isobutylene-styrene triblock copolymer, and a second layer made of a thermoplastic elastomer composition containing at least one of a styrene-isoprene-styrene triblock copolymer and a styrene-isobutylene diblock copolymer. The strip has a strip main body with a thickness of 0.05 mm to 1.0 mm and ear portions with a thickness thinner than the thickness of the strip main body and a width of 0.5 mm to 5.0 mm disposed on opposite sides thereof. | 07-10-2014 |
20140246136 | PNEUMATIC TIRE - The present invention is a pneumatic tire comprising an inner liner disposed on the inner side of the tire. The inner liner is composed of a sheet made of an elastomer composition containing a styrene-isobutylene-styrene triblock copolymer by more than or equal to 7 percent by mass and less than or equal to 93 percent by mass and an isobutylene-based modified copolymer containing a β-pinene component by more than or equal to 7 percent by mass and less than or equal to 93 percent by mass. In the inner liner, a ratio Gs/Gb between an average thickness Gb in a bead region Rb extending from a tire largest width position to a bead toe and an average thickness Gs in a buttress region Rs extending from the tire largest width position to a corresponding position Lu at a belt layer end is 0.30 to 0.75. | 09-04-2014 |
20140261976 | METHOD FOR MANUFACTURING PNEUMATIC TIRE - In a method for manufacturing a pneumatic tire, molding of a green tire has an assembly step of bonding an inner liner and an unvulcanized rubber sheet with end portions thereof in a width direction being displaced from each other by 50 mm to 500 mm in the width direction to manufacture a laminate, cutting the laminate to have a constant length corresponding to a width of a drum to manufacture a cut sheet, and a joining step of winding the cut sheet on entire circumference of the drum such that a cut surface thereof extends in a circumferential direction of the drum and the inner liner is disposed on an inner surface side, and joining the end portions of the inner liner and joining the end portions of the unvulcanized rubber sheet such that positions of the joined end portions are displaced by a constant distance. | 09-18-2014 |
20150075692 | PNEUMATIC TIRE - A pneumatic tire includes an inner liner and a carcass ply provided adjacent to the inner liner and having a cord embedded in a rubber layer. The inner liner is composed of a polymer layer stack including a first layer of a polymer composition containing SIBS and a rubber component having a thickness of 0.05 mm to 0.6 mm, and a second layer of a polymer composition containing at least either one of SIS and SIB as well as a rubber component having a thickness of 0.01 mm to 0.3 mm. The second layer is arranged so as to be in contact with the rubber layer of the carcass ply. A distance L from a plane passing through the center of cross section of the cord to the second layer is more than or equal to 0 and less than or equal to (1+D/2) mm where D denotes the diameter of the cord. | 03-19-2015 |