Abstract: A rubber composition used for a tire, in which friction on ice is improved, which includes 0.5 to 30 parts by weight of a filler having at least two protuberances and a non-metal fiber based on 100 parts by weight of a diene rubber.

Abstract: A rubber composition used for a tire, in which friction on ice is improved, which includes 0.5 to 30 parts by weight of a filler having at least two protuberances and a non-metal fiber based on 100 parts by weight of a diene rubber.

Abstract: The present invention provides a rubber composition which can sufficiently improve performance on ice and snow and wet gripping properties, and a pneumatic tire using the same. The rubber composition comprises, based on 100 parts by weight of diene rubber (A), 2 to 20 parts by weight of short fiber (B) having an average fiber diameter of 10 to 100 ?m and average fiber length of 0.01 to 4 mm, 1 to 10 parts by weight of particles (C) having a Moh's hardness of at least 5 and average particle size of at most 500 ?m, and 1 to 15 parts by weight of starch/plasticizer composite material (D), and the pneumatic tire has a tread made of the rubber composition.

Abstract: The present invention provides a studless tire excellent in performance on ice and snow in which digging friction is improved without losing adhesion friction. The studless tire has a tread comprising specific short fiber or plate-like material dispersed in diene rubber so as to be oriented in the tread thickness direction, wherein when measured at 25° C. the tread has a complex elastic modulus E1 in the tread thickness direction, and the sheet has a complex elastic modulus E? in the extrusion direction and a complex elastic modulus E? in a 90° direction from the extrusion direction, when the rubber composition is made into 2 mm sheets with a roller and these moduli fulfill the following equation, 60?(E1?E?)/(E??E?)×100?100 and the tread has a specific tread rubber hardness.

Abstract: The present invention provides a pneumatic tire in which friction and abrasion resistance are compatible on the icy and snowy road. The present invention relates to a pneumatic tire having a part of a tread comprising a rubber composition containing less than 5 parts by weight of silica based on 100 parts by weight of a diene rubber containing at least 50% by weight of a polybutadiene rubber having at least 95% of cis-1,4 bond and carbon black in which the iodine adsorption is at least 100 g/kg and 24M4 dibutyl phthalate oil absorption is at least 90 ml/100 g, wherein the total amount of the silica and the carbon black is 30 to 40 parts by weight, and whrein the hardness of the above rubber composition at 0° C. is 35 to 47.

Abstract: The present invention provides a rubber composition of a tire and a pneumatic tire, in which friction on ice is improved. Specifically, the present invention relates to a rubber composition for a tire comprising 0.5 to 30 parts by weight of a filler having at least two protuberances based on 100 parts by weight of diene rubber, the average length of said protuberances being at least 10 ?m, and a pneumatic tire comprising the rubber composition for a tire.

Abstract: The present invention provides a rubber composition of a tire, in which friction on ice is improved, and a pneumatic tire using the composition for a tire tread. Specifically, the present invention relates to a rubber composition for a tire comprising 0.5 to 30 parts by weight of a filler having at least two protuberances based on 100 parts by weight of diene rubber and a pneumatic tire using the composition for a tire tread.

Abstract: The present invention provides a studless tire which has superior performance on ice and snow in which adhesion friction, digging friction and scratching friction of the tire to the road and abrasion resistance are improved and can maintain this performance. The studless tire has a tread comprising diene rubber and non-metal short fiber which is surface-treated in advance and dispersed in said diene rubber so as to be oriented in the tread thickness direction, wherein when measured at 25° C.

Abstract: The present invention provides a studless tire excellent in performance on ice and snow in which digging friction is improved without losing adhesion friction. The studless tire has a tread comprising specific short fiber or plate-like material dispersed in diene rubber so as to be oriented in the tread thickness direction, wherein when measured at 25° C.

Abstract: The present invention provides a rubber composition which can sufficiently improve performance on ice and snow and wet gripping properties, and a pneumatic tire using the same. The rubber composition comprises, based on 100 parts by weight of diene rubber (A), 2 to 20 parts by weight of short fiber (B) having an average fiber diameter of 10 to 100 &mgr;m and average fiber length of 0.01 to 4 mm, 1 to 10 parts by weight of particles (C) having a Moh's hardness of at least 5 and average particle size of at most 500 &mgr;m, and 1 to 15 parts by weight of starch/plasticizer composite material (D), and the pneumatic tire has a tread made of the rubber composition.