Abstract: The present invention provides a rubber composition for a prosthetic foot sole exhibiting high grip performance in all weather conditions and excellent in durability, and the prosthetic foot sole. The rubber composition for a prosthetic foot sole and the prosthetic foot sole, include at least one rubber component selected from a natural rubber and a synthetic diene rubber and at least one filler selected from carbon black and an inorganic filler, wherein the total amount of the filler is 50 parts by mass or more and 150 parts by mass or less.

Abstract: This invention relates to a pneumatic tire provided at its bead portion with a rubber chafer (4) and covered at its inner surface with an innerliner (5), wherein a toe rubber (6) is further arranged on a toe end part of the bead portion so as to overlap with the rubber chafer (4) and the innerliner (5) and locate at least outside the innerliner (5) at the overlapped portion with the innerliner (5), and a rubber composition A containing at least one of butyl rubber and halogenated butyl rubber as 20-40 mass % of a rubber component is used in the toe rubber (6).

Abstract: In the present invention, a tire for heavy loading which is excellent in an air holding property and a durability of a bead part and can stand use over a long period of time can be provided by disposing an air blocking layer having a thickness of 1 mm or less and an oxygen permeation amount of 3×10?13 cm3·cm/cm2·sec·Pa or less at 60° C. and 65% RH on a whole outermost layer of a carcass layer 50 that an end of the air blocking layer is set within 100 mm from a toe tip of a bead part in a direction along a bead base line. Further, a conventional inner liner can be reduced in a thickness or removed, and the tire can be reduced in a weight.

Abstract: This invention relates to a pneumatic tire provided at its bead portion with a rubber chafer (4) and covered at its inner surface with an innerliner (5), wherein a toe rubber (6) is further arranged on a toe end part of the bead portion so as to overlap with the rubber chafer (4) and the innerliner (5) and locate at least outside the innerliner (5) at the overlapped portion with the innerliner (5), and a rubber composition A containing at least one of butyl rubber and halogenated butyl rubber as 20-40 mass % of a rubber component is used in the toe rubber (6).

Abstract: An adhesion promoter composition containing a Zn, K, Al, Ti or Zr metal salt of an organic acid and at least one of a hydrous inorganic salt and an organic molybdenum compound. The adhesion promoter composition may be used to form an adherent rubber composition. The use of the adhesion promoter composition results in an adherent rubber composition which is stable and has a high adhesive force.

Abstract: An adherent rubber composition suitable for use in the adhesion to steel cords comprises given amounts of an inorganic salt hydrate and sulfur based on 100 parts by weight of rubber ingredient comprising not less than 10% by weight of at least one synthetic rubber and the remainder being natural rubber.

Abstract: A rubber composition for a tire tread which is provided by the present invention can be obtained by blending 100 parts by weight of a natural rubber and/or a diene synthetic rubber with40 to 100 parts by weight of a carbon black having characteristic values of a cetyltriammonium bromide adsorption specific surface area (CTAB) being 90 to 220 m.sup.2 /g and a 24M4DBP absorption value being 90 to 140 ml/100 g, and0.1 to 20 parts by weight of an organic unsaturated fatty acid having two or more carbon double bonds in its molecule which includes 10% by weight or more of a conjugated diene acid having at least one pair of two carbon double bonds in a conjugated relation in its molecule.This rubber composition for a tire tread can be suitably used for a pneumatic tire, particularly a pneumatic tire for heavy load having an excellent wear resistance.