Abstract: A first belt cord made of organic fibers of a spirally wound belt layer extends at an angle of equal to or less than 5° relative to a tire equatorial plane, a second belt cord made of organic fibers of a zigzag belt layer extends at an inclination of an angle of 2° to 45° relative to the tire equatorial plane, to folding back points where the second belt cord is folded back at each width directional end edge of the zigzag belt layer, and a relation of N95>N50 is satisfied. N50 is the number of stacked belt layers of the spirally wound belt layers, at 50% of half the length of a maximum belt width of belt layers from the tire equatorial plane. N95 is the number of stacked belt layers of the spirally wound belt layers, at 95% of half the length of the maximum belt.

Abstract: A pneumatic tire for aircraft according to this disclosure has belt layers arranged in the following order from the inside of the tire radial direction: the inner zigzag belt layers, the spiral belt layers, and the outer zigzag belt layers, and among the belt layers, the inner zigzag belt layer has the maximum width in the tire width direction.

Abstract: A pneumatic tire for aircraft according to this disclosure satisfies the following inequality in the reference state, 0??35/Rc?0.004 and 0.015??90/Rc?0.025.

Abstract: A first belt cord made of organic fibers of a spirally wound belt layer extends at an angle of equal to or less than 5° relative to a tire equatorial plane, a second belt cord made of organic fibers of a zigzag belt layer extends at an inclination of an angle of 2° to 45° relative to the tire equatorial plane, to folding back points where the second belt cord is folded back at each width directional end edge of the zigzag belt layer, and a relation of N95>N50 is satisfied. N50 is the number of stacked belt layers of the spirally wound belt layers, at 50% of half the length of a maximum belt width of belt layers from the tire equatorial plane. N95 is the number of stacked belt layers of the spirally wound belt layers, at 95% of half the length of the maximum belt.

Abstract: An aircraft pneumatic tire includes a spirally wound belt layer in which a ribbon-shaped first strip material with a first belt cord including organic fibers and being covered with rubber is spirally wound; and zigzag belt layers in which a ribbon-shaped second strip material with a second belt cord including organic fibers and being covered with rubber extends and is wound in a circumferential direction while bending zigzag by being folded back at width directional end edges to an outer circumferential side of the spirally wound belt layers. The maximum width of the spirally wound belt layers is wider than the maximum width of the zigzag belt layers, and the width of the second strip material is wider than the width of the first strip material.

Abstract: A belt portion of a heavy duty pneumatic tire includes a cross-laminated body in which extension directions of the cords in the belt layers next to each other in a tire radial direction intersect each other, and a parallel-laminated body in which extension directions of the cords in the belt layers next to each other in the tire radial direction are substantially parallel to each other. The parallel-laminated body is provided in the belt portion in a way that satisfies a relationship expressed with i?n/2 where n denotes a total number of belt layers included in the belt portion, and i denotes the number of a belt layer, which is located on the inner side in the tire radial direction among the belt layers of the parallel-laminated body, when the belt layers included in the belt portion are counted from an inner side in the tire radial direction.

Abstract: Provided is a pneumatic tire having excellent durability and driving stability during high-speed running of the vehicle (that is, during high-speed rotation of the tire). The pneumatic tire includes: a carcass; an intersecting belt which is provided on the outer circumference side of a crown portion of the carcass and formed of two inclined belt layers having cords inclined and extending in a direction intersecting each other across a tire equatorial plane; and a circumferential belt layer which is provided on either one of the inner side and the outer side of the intersecting belt in the tire radial direction and includes a spiral cord arranged as being spirally wound at an inclination angle of equal to or smaller than 5 degrees to the tire equatorial plane.

Abstract: Proposed is a pneumatic tire having excellent durability, handling stability and uneven wear resistance even if weight reduction is achieved by improving a belt. The pneumatic tire according to the present invention having a carcass layer 5 toroidally extending from a tread portion 3 through a side wall portion 2 to a bead portion 1, and a belt layer 6 disposed at the outer side of the carcass layer 5 in the tire radial direction, in which the carcass layer 5 includes one or more carcass plies 5a, the belt layer 6 includes a first belt 7 having a first cord 7a inclined with respect to a tire equator S at an angle in the range of 15° to 75° and a second belt 8 having a second cord 8a extending in parallel to the tire equator S, said first belt 7 having a tensile strength smaller than that of the second belt 8.

Abstract: In tread-width-direction cross section under a standard internal pressure and no load condition, a point B is an outermost point of overlapping area in tread-width-direction, a line CC is a line passing through an outermost point CT of carcass layer in tread-width-direction and extending along tread-width-direction, a point C is a point of tire surface through the line CC, a line segment BW is a line segment extending in tread-width-direction from an equator center line to point B, a line segment CW is a line segment extending along tread-width-direction from equator center line to point C, and a line segment BC is a line segment connecting between point B and C. A ratio BW/CW between a length of BW and CW is not less than 0.6 and not more than 0.8. An angle ? formed by BC and CW is not less than 50° and not more than 70°.

Abstract: Provided is a pneumatic tire having excellent durability and driving stability during high-speed running of the vehicle (that is, during high-speed rotation of the tire). The pneumatic tire includes: a carcass; an intersecting belt which is provided on the outer circumference side of a crown portion of the carcass and formed of two inclined belt layers having cords inclined and extending in a direction intersecting each other across a tire equatorial plane; and a circumferential belt layer which is provided on either one of the inner side and the outer side of the intersecting belt in the tire radial direction and includes a spiral cord arranged as being spirally wound at an inclination angle of equal to or smaller than 5 degrees to the tire equatorial plane.

Abstract: In tread-width-direction cross section under a standard internal pressure and no load condition, a point B is an outermost point of overlapping area in tread-width-direction, a line CC is a line passing through an outermost point C? of carcass layer in tread-width-direction and extending along tread-width-direction, a point C is a point of tire surface through the line CC, a line segment BW is a line segment extending in tread-width-direction from an equator center line to point B, a line segment CW is a line segment extending along tread-width-direction from equator center line to point C, and a line segment BC is a line segment connecting between point B and C. A ratio BW/CW between a length of BW and CW is not less than 0.6 and not more than 0.8. An angle ? formed by BC and CW is not less than 50° and not more than 70°.

Abstract: Provided is a pneumatic tire having excellent durability and driving stability during high-speed running of the vehicle (that is, during high-speed rotation of the tire). The pneumatic tire includes: a carcass; an intersecting belt which is provided on the outer circumference side of a crown portion of the carcass and formed of two inclined belt layers having cords inclined and extending in a direction intersecting each other across a tire equatorial plane; and a circumferential belt layer which is provided on either one of the inner side and the outer side of the intersecting belt in the tire radial direction and includes a spiral cord arranged as being spirally wound at an inclination angle of equal to or smaller than 5 degrees to the tire equatorial plane.

Abstract: Proposed is a pneumatic tire having excellent durability, handling stability and uneven wear resistance even if weight reduction is achieved by improving a belt. The pneumatic tire according to the present invention having a carcass layer 5 toroidally extending from a tread portion 3 through a side wall portion 2 to a bead portion 1, and a belt layer 6 disposed at the outer side of the carcass layer 5 in the tire radial direction, in which the carcass layer 5 includes one or more carcass plies 5a, the belt layer 6 includes a first belt 7 having a first cord 7a inclined with respect to a tire equator S at an angle in the range of 15° to 75° and a second belt 8 having a second cord 8a extending in parallel to the tire equator S, said first belt 7 having a tensile strength smaller than that of the second belt 8.

Abstract: There are provided a process and the like for judging a residual lifetime of a run-flat tire and an end stage of the residual lifetime thereof during continuous running at a run-flat state.

Abstract: There are provided a process and the like for judging a residual lifetime of a run-flat tire and an end stage of the residual lifetime thereof during continuous running at a run-flat state.

Abstract: A polyetheresteramide having good heat resistance, permanent antistatic property and superior compatibility with thermoplastic resins and a resin composition containing the polyetheresteramide are disclosed, wherein the polyetherester-amide consists essentially of a polyamide oligomer with carboxylic chain ends having a number average molecular weight between 200 and 5,000 and a bisphenol compound with oxyalkylene units having a number average molecular weight between 300 and 3,000. Antistatic resin compositions with good antistatic property and heat resistance are obtained from compositions comprising 3 to 40% by weight of the polyetheresteramide and 60 to 97% by weight of thermoplastic resins. The antistatic resin compositions can contain as compatibilizers vinyl polymers having functional groups such as carboxyl and epoxy groups or block polymers containing polyolefin blocks and aromatic vinyl polymer blocks.

Abstract: A polyetheresteramide having good heat resistance, permanent antistatic property and superior compatibility with thermoplastic resins and a resin composition containing of the polyetheresteramide are disclosed, wherein the polyetherester-amide consists essentially of a polyamide oligomer with carboxylic chain ends having a number average molecular weight between 200 and 5,000 and a bisphenol compound with oxyalkylene units having a number average molecular weight between 300 and 3,000. Antistatic resin compositions with good antistatic property and heat resistance are obtained from compositions comprising 3 to 40% by weight of the polyetheresteramide and 60 to 97% by weight of thermoplastic resins. The antistatic resin compositions can contain as compatibilizers vinyl polymers having functional groups such as carboxyl and epoxy groups or block polymers containing polyolefin blocks and aromatic vinyl polymer blocks.

Abstract: A polyetheresteramide having good heat resistance, permanent antistatic property and superior compatibility with thermoplastic resins and a resin composition containing the polyetheresteramide are disclosed, wherein the polyetherester-amide consists essentially of a polyamide oligomer with carboxylic chain ends having a number average molecular weight between 200 and 5,000 and a bisphenol compound with oxyalkylene units having a number average molecular weight between 300 and 3,000. Antistatic resin compositions with good antistatic property and heat resistance are obtained from compositions comprising 3 to 40% by weight of the polyetheresteramide and 60 to 97% by weight of thermoplastic resins. The antistatic resin compositions can contain as compatibilizers vinyl polymers having functional groups such as carboxyl and epoxy groups or block polymers containing polyolefin blocks and aromatic vinyl polymer blocks.

Abstract: Vibration-absorbing elastomeric composites, having improved vibration-damping properties with improved moldability and resin properties suitable for molded products, are obtained by reacting, insitu in a melted thermoplastic resin such as olefin-diene copolymer, a polyisocyanate with a polyol to form a polyurethane having a nitrogen atom content of at least 3% and having a solubility parameter which is higher by at least 2.5 than that of said thermoplastic resin.