Abstract: A pneumatic tire having a low air permeability, an improved fatigue resistance and a low fuel consumption is disclosed, which comprises an inner liner made of a vulcanizate of a rubber composition comprising 3-30 parts by weight of micro organic short fibers and 10-100 parts by weight of carbon black on a basis of 100 parts by weight of a rubber blend consisting mainly of butyl rubber and/or halogenated butyl rubber; said micro organic short fiber consisting of an amorphous portion having a glass transition temperature of less than 30.degree. C. or more than 120.degree. C. and a crystal portion having a melting point of not less than 160.degree. C., and having an average length of 0.8-30 .mu.m, an average diameter of 0.02-0.8 .mu.m and a ratio of average length to average diameter of 8-400.

Abstract: A pneumatic tire having a tread is disclosed, which comprises using in said tread a rubber composition containing 10 to 120 parts by weight of carbon black and 0.

Abstract: A pneumatic tire having a tread is disclosed, which comprises using in said tread a rubber composition containing 10 to 120 parts by weight of carbon black and 0.

Abstract: Organic micro-fiber reinforced rubber compositions having high elastic modulus, excellent crack growth resistance, impact cut resistance and rebound resilience and a small swell value are prepared by incorporating 10-100 parts by weight of carbon black, 3-30 parts by weight of organic micro-fibers based on 100 parts by weight of at least one rubber selected from a group consisting of natural rubber, synthetic polyisoprene rubber, butyl rubber, halogenated butyl rubber, polybutadiene rubber, styrene-butadiene copolymeric rubber, ethylene-propylene-diene ternary copolymeric rubber and acrylonitrile-butadiene copolymeric rubber, said micro-organic staple fibers being lower than 30.degree. C. or higher than 120.degree. C. in glass transition temperature of amorphous portion and higher than 160.degree. C. in melting point of crystal portion, and having an average length of the micro-fibers of 0.8-30 .mu.m, an average diameter of the micro-fibers of 0.02-0.8 .mu.

Abstract: A pneumatic tire having a cap/base structured tread and having an improved resistance against heat build-up and an improved wear resistance at the end of the use can be obtained by forming a tread base rubber of the tire with a vulcanizate of a rubber composition comprising specifically limited amounts of short fibers of syndiotactic-1,2-polybutadiene having a maximum diameter of not more than 10.mu. and an average diameter of less than 1.mu., carbon black, sulfur and natural or synthetic rubber.

Abstract: A pneumatic tire having an improved chipping resistant property is disclosed. In the tire, the tread portion is formed with a vulcanizate of a rubber composition comprising 3-40 parts by weight of short fibers of syndiotactic-1,2-polybutadiene, 30-100 parts by weight of carbon black and 0.2-5 parts by weight of a p-phenylenediamine type antioxidant, on a basis of 100 parts by weight of a rubber selected from natural rubber, synthetic rubber and a blend thereof in an optional blending ratio.

Abstract: This invention relates to a composition comprising a polybutadiene rubber containing a polymer obtained by block or graft polymerization of cis-1,4-polybutadiene with syndiotactic (syn)-1,2-polybutadiene, alone or blended with the other diene rubber, said syn-1,2-polybutadiene being crystallized and in a short fiber-like shape, and a breaking resistance characteristic and reinforcement characteristic being considerably improved by specifying the diameter and length of said short fiber, which is suitable for various parts of tire or industrial materials, and further relates to a composition of said polybutadiene rubber to which a carbon black is added for preferably used as a chafer or tread of tire, and still further relates to said composition to which a carbon black and an antioxidant are added for preferably used as a rubber blend composition for side wall.

Abstract: A coating rubber composition for tire cords is disclosed. This composition is an unvulcanized rubber composition comprising 3-40 parts by weight of short fibers of syndiotactic-1,2-polybutadiene having a maximum diameter of not more than 10.mu. and an average diameter of less than 1.mu. and 30-120 parts by weight of carbon black, on a basis of 100 parts by weight of a rubber, and has a swelling value of not more than 140% in the extrusion at 100.degree. C.

Abstract: A dual-gate Schottky barrier gate field effect transistor is provided with an intermediate electrode between a first and a second gate electrode. This intermediate electrode forms an ohmic contact with a semiconductor substrate of the transistor. The transistor is produced by etching a first film formed on a planar surface of the substrate by the use of a pair of mask pieces to leave a pair of gate electrodes narrower than the mask pieces and projecting a metal capable of forming an ohmic contact with the semiconductor towards the planar surface perpendicularly thereof. The projected metal provides source and drain electrode on both sides of the gate electrode pair and an intermediate electrode between the gate electrodes. The intermediate electrode may be left floating during operation.

Abstract: A Shottky barrier gate field effect transistor is produced by etching a first conductive film formed on a semiconductor crystal surface using a mask to leave a first conductive film area smaller than the area of the mask and projecting a second conductive material on to the surface perpendicularly thereof. The second conductive film areas thus formed and the first conductive film area serve as the source and drain electrodes and the gate electrodes, respectively.