Abstract: The present invention relates to a polyester cord for reinforcement of rubber where heat-resistant adhesive property when exposed to high temperature for long time in a state of being embedded in a rubber composition or under a high-temperature atmosphere is significantly improved, stiffness of the cord is made soft to such a level which is no problem in terms of practical use in view of anti-fatigue property and also of molding and processing property of the rubber-reinforced product and a high elastic modulus is available; and a method for manufacturing the same.

Abstract: It is provided a polyester cord for reinforcement of rubber suitable to the use for tire cap ply where a high elastic modulus is available and heat-resisting adhesive property and strength retaining rate upon exposure to high temperature for long time in rubber are significantly improved and also to provide a method for producing the same.

Abstract: A polyester fiber containing polyethylene terephthalate at 90 mol % or higher of a whole repeating unit in a molecular chain thereof, the fiber having an intrinsic viscosity (IV) of 0.85 dl/g or higher and simultaneously meeting the following characteristics: (a) strength?6.0 cN/dtex; (b) strength×(breaking elongation)0.5?26.0 cN/dtex. %0.5; (c) monofilament linear density?5.0 dtex; and (d) main dispersion peak temperature of loss tangent (tan ?) in the measurement of dynamic viscoelasticity at 110 Hz?147.0° C.

Abstract: A polyester fiber containing polyethylene terephthalate at 90 mol % or higher of a whole repeating unit in a molecular chain thereof, the fiber having an intrinsic viscosity [IV] of 0.85 dl/g or higher and simultaneously meeting the following characteristics: (a) strength≧6.0 cN/dtex; (b) strength×(breaking elongation)0.5≦26.0 cN/dtex.%0.5; (c) monofilament linear density≦5.0 dtex; and (d) main dispersion peak temperature of loss tangent (tan &dgr;) in the measurement of dynamic viscoelasticity at 110 Hz≦147.0° C.