Polymer sheet for inner liner and pneumatic tire using the same

摘要

Provided is a pneumatic tire which exhibits excellent performance in flex crack growth resistance, rolling resistance and static air pressure drop, and includes an SIBS layer containing a styrene-isobutylene-styrene triblock copolymer as a polymer sheet used for an inner liner. The SIBS layer has a thickness more than or equal to 0.05 mm and less than or equal to 0.6 mm. The SIBS layer contains more than or equal to 0.5% by mass and less than or equal to 40% by mass of a polymer obtained by polymerization of a monomer unit having 4 carbon atoms.

主权项

1. A pneumatic tire comprising a polymer sheet for an inner liner part of said tire,
wherein said polymer sheet comprises an SIBS layer containing more than or equal to 60% mass and less than or equal to 99.5% by mass of a styrene-isobutylene-styrene triblock copolymer, and an SIB layer containing a styrene-isobutylene diblock copolymer, said SIBS layer having a thickness more than or equal to 0.05 mm and less than or equal to 0.6 mm, said SIB layer having a thickness more than or equal to 0.01 mm and less than or equal to 0.3 mm, and said SIBS layer and said SIB layer containing more than or equal to 0.5% by mass and less than or equal to 40% by mass of a polymer obtained by polymerization of a monomer unit having 4 carbon atoms, wherein said polymer that is obtained by polymerization of the monomer unit having 4 carbon atoms is composed of at least one of polybutene and polyisobutylene, and said SIBS layer is arranged at a radial innermost side of said pneumatic tire.