STRIP, METHOD FOR MANUFACTURING THE SAME, AND METHOD FOR MANUFACTURING PNEUMATIC TIRE

摘要

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 (T1) of 0.05 mm to 1.0 mm. The ear portions have a thickness (T2) thinner than the thickness (T1) of the strip main body and a width (W2) of 0.5 mm to 5.0 mm. This ribbon-shaped strip reduces unevenness of the surface of a sheet formed by the opposite ends of the strip when manufacturing an inner liner.

主权项

1. A method for manufacturing a pneumatic tire in which a strip is wound spirally on a cylindrical drum such that a strip main body forms overlapping portions to form an inner liner, and the inner liner is disposed on an inner surface of a raw tire, and then vulcanization is performed wherein,
said strip being formed of composite layers of (A) a first layer made of a styrene-isobutylene-styrene (SIBS) triblock copolymer, and (B) a second layer comprising:
(b1) a layer made of a styrene-isoprene-styrene (SIS) triblock copolymer; and(b2) a layer made of a styrene-isobutylene (SIB) diblock copolymer containing at least one additive selected from the group consisting of stearic acid, zinc oxide, antioxidant, vulcanization accelerator, and sulfur, and disposed adjacently to a carcass ply, said strip further having ear portions on opposite sides of the strip main body, said strip main body having a thickness of 0.05 mm to 1.0 mm, and said ear portions having a thickness thinner than the thickness of said strip main body and a width of 0.5 mm to 5.0 mm.