Pneumatic tire

A technology for pneumatic tires and tires, applied in the direction of pneumatic tires, special tires, tire parts, etc., can solve problems such as peeling, improve adhesion, improve flex fatigue and crack resistance, and improve air permeability Effect

Active Publication Date: 2014-01-22
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this configuration, peeling occurs between the rubber layer of the carcass and the air permeation prevention layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach A

[0054] The present invention is a pneumatic tire having an inner liner on the inner side of the tire. The inner liner is composed of a polymer sheet containing 99.5 to 60% by mass of a styrene-isobutylene-styrene triblock copolymer (hereinafter , referred to as "SIBS") and 0.5 to 40% by mass of styrene-maleic anhydride copolymer (hereinafter referred to as "SMA") polymer mixture composition. Although the polymer composition composed of SIBS has poor vulcanized adhesion to rubber, it has excellent air resistance due to the isobutylene block source of SIBS. On the other hand, styrene-maleic anhydride copolymers are poor in air permeability resistance, but are very excellent in vulcanized adhesiveness to rubber. Therefore, when a polymer film containing SIBS and SMA is used for the inner liner, a pneumatic tire having excellent air resistance and vulcanization adhesion can be obtained.

[0055] (polymer sheet)

[0056] In one embodiment of the present invention, the inner linin...

Embodiment approach B

[0099] The present invention is a pneumatic tire having an inner liner on the inside of the tire, said inner liner being composed of a polymer sheet of a thermoplastic elastomer composition relative to a styrene-isobutylene-styrene triblock copolymer 100 parts by mass of the product contains 0.1 to 100 parts by mass of a tackifier.

[0100] (Polymer composition for inner liner)

[0101] The polymer composition of the inner liner in the present invention is composed of an elastomer composition consisting of at least 80% by mass of styrene-isobutylene-styrene triblock copolymer (SIBS) and less than 20% by mass of Composed of rubber components or a mixture of thermoplastic elastomers.

[0102]As the thermoplastic elastomer to be mixed in the SIBS, for example, a styrene-based thermoplastic elastomer is preferable. The styrene-based thermoplastic elastomer refers to a copolymer containing a styrene block as a hard segment. For example, styrene-isoprene-styrene block copolymer (...

Embodiment approach C

[0137] (Polymer laminates for inner linings)

[0138] The inner lining layer in the present invention is formed by a polymer laminate, and the polymer laminate is composed of a first layer and a second layer, and the first layer is made of styrene-isobutylene-styrene triblock copolymer ( SIBS) as the main thermoplastic elastomer composition, the thickness is 0.05mm ~ 0.6mm; the second layer is based on styrene-isoprene-styrene triblock copolymer and styrene-isobutylene diblock copolymer At least one of the main thermoplastic elastomer compositions has a thickness of 0.01 mm to 0.3 mm. Here, the thermoplastic elastomer composition of the first layer and the second layer is mixed with 40% by mass or less, especially 0.5 to 40% by mass of a C4 polymer which is a polymer of a monomer having 4 carbon atoms.

[0139] (Tier 1)

[0140] The first layer in the present invention contains SIBS and a C4 polymer obtained by polymerizing a monomer unit having 4 carbon atoms. The low mole...

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PUM

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Abstract

A pneumatic tire is provided with an inner liner which improves the resistance to air permeability, the bending fatigue properties, and the crack resistance. A pneumatic tire is provided with an inner liner inside the tire. The inner liner is characterized in that the inner liner is configured from at least a layer of polymer sheet containing a styrene-isobutylene-styrene triblock copolymer. The average thickness (Gs) of buttress regions (Rs) extending from the positions of the maximum width of the tire to corresponding positions (Lu) at the ends of a belt layer is less than the average thickness (Gb) of bead regions (Rb) extending from the positions of the maximum width of the tire to bead toes.

Description

technical field [0001] The present invention relates to a pneumatic tire having an inner liner. Background technique [0002] In recent years, due to the strong social demand for lower fuel consumption of automobiles, reduction in the weight of tires has been sought. In the tire member, the inner liner arranged on the inner side in the radial direction of the tire, which has the function of reducing air leakage from the inside of the pneumatic tire to the outside and improving air resistance, is also being reduced in weight. [0003] Currently, as a rubber composition for an inner liner, a butyl-based rubber containing 70 to 100% by mass of butyl rubber and 30 to 0% by mass of natural rubber is being used to improve the air permeation resistance of the tire. In addition, butyl-based rubber contains about 1% by mass of isoprene in addition to butene, and this isoprene can be co-crosslinked with adjacent rubbers together with sulfur, a vulcanization accelerator, and zinc oxid...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B60C5/14
CPCB60C1/0008B60C5/14B60C2005/145C08L53/02
Inventor饭塚融
OwnerSUMITOMO RUBBER IND LTD