Polymer sheet for inner liner and pneumatic tire using the same
AssigneeSumitomo Rubber Industries, Ltd.
InventorsMutsuki Sugimoto, Ryuichi Tokimune
Life of this patent
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Abstract
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.
Claims11
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.
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% by mass and less than or equal to 99.5% by mass of a styrene-isobutylene-styrene triblock copolymer, a SIS layer containing a styrene-isoprene-styrene triblock copolymer, and an SIB layer containing a styrene-isobutylene diblock copolymer,
- wherein said SIBS layer has a thickness more than or equal to 0.05 mm and less than or equal to 0.6 mm,
- said SIS layer and said SIB layer have a total thickness more than or equal to 0.01 mm and less than or equal to 0.3 mm,
- said SIBS layer, and at least one of said SIS layer and said SIB layer contain 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,
- said polymer obtained by polymerization of a 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.
Dependencies are inferred from the claim text.