Abstract: Polyamide fiber cords for rubber reinforcement are produced by subjecting cords having a denier per filament of 1.5-10 to RFL adhesive solution having a swelling ratio in DMSO of 122-340% at an impregnated state in cord, embedding the thus treated cords in rubber and vulcanizing them, and have a cord strength in rubber of not less than 8.0 g/d. They provide excellent fatigue resistance under repetitive compressive strain without lowering strength in the dipping and vulcanization.

Abstract: A pneumatic radial tire for airplanes comprises a toroidal carcass of at least two carcass plies, a tread rubber superimposed on the carcass, and a belt disposed between the carcass and the tread rubber, in which the belt is comprised of a plurality of radially inner belt plies and a plurality of radially outer belt plies, and each of the radially inner belt plies contains cords extending substantially zigzag at a cord angle A of 5-15.degree. with respect to the equatorial plane in the circumferential direction while radially being bent at both side ends of the ply, and each of the outer belt plies contains cords having a cord angle B larger than the cord angle A. In this tire, the occurrences of standing wave and cut peel off are prevented with the reduction of tire weight.

Abstract: A pneumatic radial tire for airplanes comprises a toroidal carcass of at least two carcass plies, a tread rubber superimposed on the carcass, and a belt disposed between the carcass and the tread rubber, in which the belt is comprised of a plurality of radially inner belt plies and a plurality of radially outer belt plies, and each of the radially inner belt plies contains cords extending substantially zigzag at a cord angle A of 5.degree.-15.degree. with respect to the equatorial plane in the circumferential direction while axially being bent at both side ends of the ply, and each of the outer belt plies contains cords having a cord angle B larger than the cord angle A. In this tire, the occurrences of standing wave and cut peel off are prevented with the reduction of tire weight.

Abstract: A pneumatic radial tire including one or more belt layers, wherein cords are used as cords for reinforcing at least one belt layer. These cords are formed by impregnating and attaching a resin having a modulus in tension of not more than 150 kg/mm.sup.2 to bundles of cord-like fibers composed of a number of filaments having a tensile strength of not less than 15 g/d and a fineness of 1-15 deniers, an impregnated and attached amount of the filaments being in a range of 30% to 70 wt % relative to a weight of the filaments, and each of the cords has an elliptical or rectangular cross-section shape having an aspect ratio of a major axis (b)/a minor axis (a) being 1.5 to 5. Each of the bundles of the fibers are not twisted.

Abstract: A pneumatic radial tire comprises a belt comprised of plural belt layers, in which at least one belt layer is formed by arranging particular twisted cords, which are obtained by twisting particular filament-resin composite bodies, at a particular end count. In this tire, the weight is light, the rolling resistance and steering stability as well as the resistances to bending of belt cord in the rapid turning and breaking of belt cord in the running on bad road are considerably excellent.

Abstract: Rubber-reinforcing fiber cords are disclosed which are constituted by at least one kind of fibers selected from a group consisting of aromatic polyamide fibers, entire aromatic polyester fibers and polyvinylalcohol fibers having a tenacity of not less than 15 g/d. Spaces among filaments constituting the cord are each impreganted with a rubbery material. Radial tires are also disclosed which each comprise at least one pair of bead wires, at least one carcass ply cord layer and at least one belt ply cord layer. Carcass ply cords and/or belt ply cords are constituted by the above rubber-reinforcing fiber cords.

Abstract: A pneumatic radial tire having improved comfortability and durability comprises a belt composed of at least two belt reinforcing layers, one of which layers contains high strength and high modulus polyvinyl alcohol fiber cords having particular properties.

Abstract: A heavy duty-high pressure pneumatic radial tires are disclosed, which each comprise a main reinforcement consisting of a carcass having an up-and-down type toroid radial construction in which a plurality of plies composed of fiber cords arranged in parallel with one another are turned up around a pair of bead cords on the right and left or the tire while the cords are arranged at angles substnatially along radial planes of the tire, at least one ply including a ply to be brought into direct contact with the bead cords being turned up around each of the bead cores from the inside to the outside of the tire and at least one remaining ply being laminated upon the outer side of the turn-up portion formed by the turn-up end portion of said at least one ply, and a belt which surrounds a crown portion of the carcass and is composed of a plurality of layers of parallel organic fiber cords having at least 150 g/d or an initial modulus higher than that of the cords of the carcass while at least one belt layer is lamin

Abstract: A heavy duty pneumatic radial tire for use under a high speed and a high internal pressure, is disclosed, which comprises a plurality of carcass cord layers of which cords are arranged at an angle from 90.degree. to 75.degree. with respect to a circumferential direction of the tire. The cords are composed of fibers of an aromatic polyamide having not less than 80 mole % of a repeating unit expressed by the following formula: --NH--Ar.sub.1 --NHCO--Ar.sub.2 --CO-- in which Ar.sub.1 and Ar.sub.2 denote at least one kind of an aromatic residue selected from: ##STR1## Elongation E.sub.n (%) of the aromatic polyamide fibers constituting the respective plies meets the following inequation:E.sub.n-1 +0.2.ltoreq.E.sub.n .ltoreq.E.sub.n-1 +2.0in which E.sub.n is an elongation (%) of the n-th layer of the carcass cord layers, provided that the carcass cord layers are taken as 1st ply, 2nd ply, 3rd ply, . . . , n-th ply from the inner liner side in which n is an integer of 2 or more, and E.sub.

Abstract: Rubber-reinforcing polyamide fiber cords are disclosed which are each obtained by primarily twisting an aromatic polyamide filament yarn, doubling a plurality of thus primarily twisted yarns and finally twisting doubled yarns in a twisting direction opposite to that of the primary twist yarn to obtain a plied yarn, and applying a rubber adhesive to the thus obtained plied yarn. N and M satisfy the following relation: 1.05.ltoreq.M/N.ltoreq.1.6 in which N and M are the number of primary twists and the number of the twists in the cord, respectively.

Abstract: A pneumatic radial tire is disclosed, which comprises a toroidal tire body extending from bead portions to a crown portion through sidewall portions, and a reinforcement for the tire body consisting of a carcass composed of at least one cord ply containing polyester fiber cords therein, which cord ply being wound around a bead core embedded in each of the bead portions from the inside of the tire to the outside thereof, and a belt composed of at least two ply layers superimposed around the crown portion of the carcass and containing cords arranged at a relatively small inclination angle with respect to the mid-circumferential plane of the tire, the cords of which being crossed with each other. In this type of the tire, the carcass line of the tire body at a mounted state of the tire on a normal rim under a normal internal pressure depicts such a radial profile in tire section that a ratio of R/R' is within a range of 0.65-0.

Abstract: A pneumatic radial tire having a high durability is disclosed, which comprises a carcass composed of at least one ply containing polyester fiber cords embedded in rubber. This polyester fiber cord has particular fiber properties and cord properties. Among the cord properties, the elongation under a tension of 2 g/D of the cord after the specific post-cure inflation treatment is not more than 4.5% and the sum of the elongation and heat shrinkage is not more than 8.0%.