Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1998-01-28
2000-05-16
Ball, Michael W.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152DIG16, 525178, 525184, 525 66, 525 92A, B60C 514
Patent
active
060622830
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a pneumatic tire which uses a thermoplastic elastomer composition excellent in flexibility and superior in gas permeation preventive property due to enabling an elastomer component to be used as a discontinuous phase and a thermoplastic resin component to be used as a continuous phase and enabling achievement of a high ratio of the elastomer component and which enables a gas permeation preventive layer such as the inner liner of a pneumatic tire to be made thinner to lighten the weight without impairing the air retention in the tire and to a low permeability thermoplastic elastomer composition used for the same.
The present invention further relates to a pneumatic tire having a gas permeation preventive layer comprising a thermoplastic elastomer resin composition comprising a rubber/matrix resin/gas barrier resin which, in addition to flexibility, vastly enhances the gas barrier property by controlling the morphology of the low permeability thermoplastic resin composition (gas barrier resin) layer, whereby the air (gas) permeation preventive layer of the pneumatic tire can be made thinner and can contribute to a reduction of the weight.
The present invention further relates to a pneumatic tire using an adhesive thermoplastic elastomer composition comprising a thermoplastic resin component as its continuous phase and an elastomer component as its dispersed face wherein an at least partially cross-linkable thermoplastic composition imparts the inherent rubber elasticity function and further the adhesiveness.
The present invention further relates to a rubber-thermoplastic elastomer laminate which enables an inner liner of a pneumatic tire or other gas (air) permeation preventive layer to be made thinner and thereby lighten the weight of a tire, more particularly relates to a rubber and thermoplastic elastomer laminate which enhances the adhesion strength at the interface of the thermoplastic elastomer and the rubber composition in the rubber and thermoplastic elastomer laminate structure, is excellent in resistance to heat degradation at the time of forming the laminate, and is superior in durability against flexing due to long term vibration after forming and to a pneumatic tire using the same.
The present invention further relates to a pneumatic tire wherein a resin film layer colored white or another color is arranged at an innermost surface or outermost surface of the tire and that coloring is used to indicate various information.
BACKGROUND ART
Reduction of the rate of fuel consumption is one of the biggest technical themes in automobiles. As part of this, there have been increasingly strong demands made for the reduction of the weight of the pneumatic tires.
The inner surface of a pneumatic tire is, however, provided with an inner liner layer comprising a low gas permeation rubber such as a butyl rubber or a halogenated butyl rubber so as to maintain a constant tire air pressure. A halogenated butyl rubber, however, has a large hysteresis loss, so when rippling occurs in the inner surface rubber of the carcass layer and the inner liner layer at the intervals between carcass cords after vulcanization of the tire, the inner liner rubber layer will deform along with the deformation of the carcass layer, and therefore, there will be the problem of an increase of the rolling resistance. Accordingly, in general, a rubber sheet called a tie rubber with a small hysteresis loss is interposed between the inner liner layer (halogenated butyl rubber) and inner surface rubber of the carcass layer to adhere the two. Therefore, in addition to the thickness of the inner liner layer of the halogenated butyl rubber, the thickness of the tie rubber is added and the thickness of the layers as a whole exceeds 1 mm (1000 .mu.m) which in the end becomes a reason increasing the weight of the product.
Techniques have been proposed for using various materials instead of a low gas permeation rubber such as a butyl rubber as the inner liner layer of the pneumatic tire. For examp
REFERENCES:
patent: 5851323 (1998-12-01), Kaido et al.
Hashimura Yoshiaki
Kawaguchi Gou
Kawazura Tetsuji
Kuroda Noriaki
Ozawa Osamu
Ball Michael W.
Musser Barbara
The Yokohama Rubber Co. Ltd.
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