The present invention discloses a preparation method of polyester cord fabric with low denier and high modulus, including steps of: spinning, reducing melt discharge volume for extruding yarn with denier of 500-1000 D; using high-speed motor and heat roller, spinning speed of 6000-6500 m/min to produce raw yarn; performing initial and repeat twisting of raw yarn by straight twisting machine; performing weaving of twisted yarn using Dornier air-jet loom to produce cord fabric, when weaving and reeding-in, using two into a reed way, adding creel roller bearing and creel single spindle tension control belt to improve uniformity; performing dipping of cord fabric using two-bath dipping, adjusting temperature to 250-260 degrees Celsius, tension to 0.3-2.9 daN/each yarn of key area, running speed of yarn to 55-70 m/min. The polyester cord fabric with low denier and high modulus can reduce rolling resistance and fuel consumption, and improve performance.

A metal or metallized reinforcer, at least the surface of which is at least partially metallic, comprises at least a metallic part coated with a polybenzoxazine, the repeat units of which comprise at least one unit corresponding to the formulae (I) or (II):

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in which Z.sub.1 and Z.sub.2, which are identical or different, represent an at least divalent, aliphatic, cycloaliphatic or aromatic bonding group comprising at least one carbon atom and optionally at least one heteroatom selected from O, S, N and P. Such a reinforcement can be used for the reinforcement of a rubber article, in particular a motor vehicle tire.

A multi-layer inner tube for a vehicle wheel, the multi-layer inner tube including an inner layer that is in contact with a gaseous filling of the inner tube; and an outer layer that differs from the inner layer, wherein the outer layer is in contact with an exterior environment of the inner tube, and wherein the inner layer and the outer layer are made from a thermoplastic polyurethane; and an intermediary layer made from an ethylene vinyl alcohol copolymer arranged between the inner layer and the outer layer.

A high modulus textile cord (50) with at least triple twist (T1, T2, T3) comprises at least N strands (20a, 20b, 20c, 20d), N being greater than 1, twisted together with a final twist T3 and a final direction D2, each strand being made up of M pre-strands (10a, 10b, 10c), M being greater than 1, themselves twisted together with an intermediate twist T2 (T2a, T2b, T2c, T2d) and an intermediate direction D1 opposite to D2, each pre-strand itself consisting of a yarn (5) which has been twisted on itself beforehand with an initial twist T1 (T1a, T1b, T1c) and the direction D1, in which at least half of the N times M yarns have an initial elastic modulus denoted Mi which is greater than 2000 cN/tex. This textile cord can advantageously be used as a reinforcer in tires for vehicles, particularly in the belt or carcass reinforcement of these tires.

The subject matter of the present invention is a process for preparing polyamide granules having heat-resistance properties, and also the use of these granules, in particular in the aid of the manufacture of yarns for airbags or for tyre cords. More specifically, the invention relates to a process for preparing polyamide granules having heat-resistance properties by wet impregnation of the granules with an aqueous solution comprising at least one heat stabilizer.

A reinforcement structure for a polymer ply includes a plurality of flat woven cords. Each flat woven cord has a width between 0.5 mm and 1.6 mm and a thickness between 0.2 mm and 0.8 mm thereby producing the reinforcement structure with an overall width between 25.0 mm and 26.0 mm. Each flat woven cord includes materials with melting points between 130 C. and 230 C.

Breaking energy test performance of lightweight tyres that have a good performance in terms of rolling resistance and having a nominal width at least equal to 135 mm and at most equal to 235 mm is increased. These tyres comprise two thin and lightened working layers (41, 42) comprising metal reinforcing elements (411, 421) made up of monofilaments having a linear breaking strength Rct at least equal to 300 daN/cm and at most equal to 400 daN/cm, and a single carcass layer (6) radially on the inside of the working layers. In order to improve performance in the breaking energy test, this carcass layer comprises textile reinforcing elements and has surface breaking energy at least equal to 1.75 J/cm.sup.2.

A pneumatic tire that can improve high speed durability while reducing a tire weight is provided. The pneumatic tire comprises a carcass, a belt layer comprising a cord inclined to a tire circumferential direction and arranged on the periphery of a crown of the carcass, and a belt reinforcing layer comprising an organic fiber cord arranged on the periphery of the belt layer along a tire circumferential direction. The organic fiber cord comprises an aromatic polyamide fiber having a fineness of 500 to 3,000 dtex, and has a single twist construction having a twist coefficient of 800 to 2,000.

A pneumatic tire includes a belt having an intersecting belt with a wide belt layer, a narrow belt layer, and a reinforcing layer between the wide belt layer and the narrow belt layer. A widthwise inner end of the reinforcing layer is on an inner side of the narrow belt layer, a widthwise outer end of the reinforcing layer is on an outer side of the narrow belt layer but on the inner side of the wide belt layer; core-sheath type composite fibers, whose core portion is composed of a high-melting-point resin having a melting point of 150 C. or higher and sheath portion composed of resin material containing an olefin-based polymer having a melting point not higher than tire vulcanization temperature, are embedded in the reinforcing layer; and an angle of the core-sheath type composite fibers is substantially the same as a reinforcing cord of the narrow belt layer.

A motorcycle tire 1 comprises a tread portion 2, sidewall portions 3, bead portions 4, a carcass 6 extending between the bead portions, and a tread reinforcing layer 7 disposed radially outside the carcass in the tread portion. The tread reinforcing layer 7 is composed of a helically wound strip 10 of parallel reinforcing cords 11 coated with topping rubber 12. The winding pitch Pm of the strip 10 in middle parts Mi of the tread reinforcing layer is less than the winding pitch Pc of the strip 10 in a central part Cr, and less than the winding pitch Ps of the strip 10 in shoulder parts Sh.