Vehicle tire including conductive rubber

Details Vehicle tire including conductive rubber Vehicle tire including conductive rubber

1998-05-12

2001-10-16

Maki, Steven D. (Department: 1733)

Resilient tires and wheels

Tires, resilient

With electrical conducting means

C152S209400, C152S209500, C152S458000, C152SDIG002

Reexamination Certificate

active

06302173

ABSTRACT:

The present invention relates to a vehicle tire improved in the rolling resistance and electrical conductivity, more particularly to an improved tread rubber decreased in the electrical resistance as well as hysteresis loss.
In recent years, from a point of view of environmental issues such as global warming, it is a main theme to decrease the rolling resistance of pneumatic tires, and many attempts have been made, and now tread rubber compounds reinforced by silica instead of conventional carbon black are regarded as very hopeful.
Such compounds have a very low hysteresis loss, but the electrical resistance is very high. Accordingly, if tires whose tread portion is made of such insulation rubber, the vehicle body is electrostatically charged, and problems such as car fire, radio noise, disturbing of light electrical appliances and the like arise.
In order to solve this problem, in the published Japanese patent application No. JP-A-9-71112, we proposed a tire in which most of the tread rubber is made of an insulation rubber, but to discharge the static electricity a conductive rubber compound is partially disposed, wherein the conductivity is provided by adding conductive small solid substance such as carbon black or powdered metal. It is better to decrease the volume of the conductive rubber for decreasing the hysteresis loss. In this case, however, the carbon black content is inevitably increased to obtain a necessary conductivity. As a result, in regard to the hardness, wear resistance and the like, it is liable to become difficult to keep a proper balance between the conductive rubber and low hysteresis loss rubber. Further, the increased hysteresis loss of the conducive rubber by the addition of carbon black is liable to void the improved rolling resistance.
It is therefor an object of the present invention to provide a tire of which rolling resistance and conductivity are improved by decreasing the carbon black content of the tread rubber and adding conductive reinforcing short fibers instead.
According to the present invention, a tire comprises a tread rubber of which radially outer surface forms the ground contacting face of the tire,
the tread rubber comprising a conductive rubber at least partially,
the conducive rubber extending from the radially inner surface of the tread rubber to the ground contacting face,
the conducive rubber is compounded from
100 parts by weight of diene rubber and
2 to 30 parts by weight of conductive short fibers,
the conducive short fibers formed by coating reinforcing short fibers with a conductive substance, and
the conductive rubber has a velum resistance of less than 1×10
8
ohm cm.


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