Abstract: This disclosure aims to provide a hose rubber composition capable of ensuring the flame retardance and simultaneously achieving both the tear resistance and the flexibility after vulcanization. The hose rubber composition of this disclosure comprises a rubber component and a carbon black, wherein: a chloroprene rubber is contained at an amount of 60 parts by mass or more in 100 parts by mass of the rubber component; the carbon black is compounded at an amount of more than 30 parts by mass and less than 80 parts by mass per 100 parts by mass of the rubber component; and the carbon black contains 13 mass % or more of a specific carbon black having an iodine adsorption of 100 to 160 mg/g and a DBP oil absorption of 70 to 180 mL/100 g.

Abstract: A hose includes an inner tube rubber layer, a woven material underlayer having a woven base material made of polyamide (PA) or polyethylene terephthalate (PET), and a reinforcing material layer, which are sequentially laminated on the inner rube rubber layer in this order. Following relationship formula (1) is to be satisfied, A·t+B·C<D??(1) wherein “A” represents SO42? concentration in the inner tube rubber layer (unit: mol/mm3), “t” represents thickness of the inner tube rubber layer (unit: mm), “B” represents SO42? concentration per 1 g of the woven base material (unit: mol/g), “C” represents mass of the woven base material per unit area of the woven material underlayer (unit: g/mm2), and “D” represents a constant of 2.5×10?9 (unit: mol/mm2). 100 pbm of a rubber component contains at least 60 pbm of acrylonitrile butadiene rubber (NBR) and t?0.5 mm.

Abstract: Provided is a hose rubber composition having improved adhesiveness to wires while maintaining rubber characteristics, and containing: acrylonitrile-butadiene rubber (NBR) and ethylene-propylene-diene rubber (EPDM) as rubber components; and further containing: a cobalt salt of an organic acid and hydrotalcite, in which 0.5 to 5 parts by mass of the hydrotalcite is contained with respect to 100 parts by mass of the rubber components.

Abstract: Provided is a high-productivity rubber composition having excellent adhesiveness to a reinforcing member, particularly a reinforcing member in environmental degradation, and capable of bringing high peel operability therewith. The rubber composition is obtainable by compounding a rubber component containing a diene based rubber, a wet silica, a carbon black and a calcium carbonate, wherein: a compounding amount of the wet silica is 3 parts by mass or more and less than 5 parts by mass per 100 parts by mass of the diene based rubber; and a compounding amount of the calcium carbonate is 10 parts by mass or more and 120 parts by mass or less per 100 parts by mass of the diene based rubber.

Abstract: Provided is a rubber composition capable of suppressing deterioration of adhesiveness to a reinforcing member even in the case of having been subjected to repeated flex fatigue. The rubber composition is obtainable by compounding a rubber component containing a diene based rubber, a wet silica, a carbon black, and a calcium carbonate, wherein: a compounding amount of the wet silica is 3 parts by mass or more per 100 parts by mass of the diene based rubber; a nitrogen adsorption BET specific surface area of the carbon black is 8 m2/g or more and 100 m2/g or less; and the following formula 0.5X+28?Y?X+88 is satisfied, where X represents the nitrogen adsorption BET specific surface area of the carbon black in terms of m2/g, and Y represents a compounding amount of the calcium carbonate in terms of parts by mass per 100 parts by mass of the diene based rubber.

Abstract: Provided is a rubber composition capable of exhibiting high adhesiveness to a reinforcing member when vulcanized, without depending on the vulcanization temperature. The rubber composition comprises: 100 parts by mass of (A) a diene based rubber; 25 parts by mass or more and 55 parts by mass or less of (B) carbon black including a carbon black (b-1) having a nitrogen adsorption BET specific surface area of 50 m2/g or more and a DBP oil absorption of 80 mL/100 g or more and 130 mL/100 g or less, and a carbon black (b-2) having a nitrogen adsorption BET specific surface area of less than 50 m2/g and a DBP oil absorption of 60 mL/100 g or more and less than 110 mL/100 g; and 3 parts by mass or more of (C) wet silica.

Abstract: A hose includes an inner tube rubber layer, a woven material underlayer having a woven base material made of polyamide (PA) or polyethylene terephthalate (PET), and a reinforcing material layer, which are sequentially laminated on the inner rube rubber layer in this order. Following relationship formula (1) is to be satisfied, A·t+B·C<D ??(1) wherein “A” represents SO42? concentration in the inner tube rubber layer (unit: mol/mm3), “t” represents thickness of the inner tube rubber layer (unit: mm), “B” represents SO242? concentration per 1 g of the woven base material (unit: mol/g), “C” represents mass of the woven base material per unit area of the woven material underlayer (unit: g/mm2), and “D” represents a constant of 2.5×10?9 (unit: mol/mm2). 100 pbm of a rubber component contains at least 60 pbm of acrylonitrile butadiene rubber (NBR) and t?0.5 mm.

Abstract: Provided is a hose rubber composition having improved adhesiveness to wires while maintaining rubber characteristics, and containing: acrylonitrile-butadiene rubber (NBR) and ethylene-propylene-diene rubber (EPDM) as rubber components; and further containing: a cobalt salt of an organic acid and hydrotalcite, in which 0.5 to 5 parts by mass of the hydrotalcite is contained with respect to 100 parts by mass of the rubber components.

Abstract: This disclosure aims to provide a hose rubber composition capable of ensuring the flame retardance and simultaneously achieving both the tear resistance and the flexibility after vulcanization. The hose rubber composition of this disclosure comprises a rubber component and a carbon black, wherein: a chloroprene rubber is contained at an amount of 60 parts by mass or more in 100 parts by mass of the rubber component; the carbon black is compounded at an amount of more than 30 parts by mass and less than 80 parts by mass per 100 parts by mass of the rubber component; and the carbon black contains 13 mass % or more of a specific carbon black having an iodine adsorption of 100 to 160 mg/g and a DBP oil absorption of 70 to 180 mL/100 g.

Abstract: The hose rubber composition of this disclosure comprises a rubber component, a carbon black and a plasticizer component, wherein: a chloroprene rubber is contained at an amount of 60 parts by mass or more in 100 parts by mass of the rubber component; the carbon black is compounded at an amount of more than 50 parts by mass in 100 parts by mass of the rubber component; and the plasticizer component contains a flame retardant plasticizer, the flame retardant plasticizer being compounded at an amount of 2 parts by mass or more in 100 parts by mass of the rubber component.

Abstract: The hose rubber composition of this disclosure is a hose rubber composition comprising an organic compound, the hose rubber composition obtainable by compounding a compounding ingredient to a rubber component, wherein: a chloroprene rubber is contained at an amount of less than 70 parts by mass in 100 parts by mass of the rubber component; a chlorinated polymer other than chloroprene rubber is contained in the rubber component as an optional component; a sulfur and, as an optional component, a chlorinated compounding ingredient are contained in the compounding ingredient; and a relation (1) is satisfied: ?k=1nAkXk>0.

Abstract: A hose rubber composition and hose having improved crack resistance while ensuring flame retardance are provided. The hose rubber composition includes: a rubber component including 70 parts by mass or more chloroprene rubber in 100 parts by mass the rubber component; and 45 parts to 65 parts by mass carbon black with respect to 100 parts by mass the rubber component, wherein the carbon black has an iodine adsorption number of 20 mg/g to 100 mg/g, and a DBP oil absorption number of 50 mL/100 g to 150 mL/100 g.

Abstract: The present invention provides a rubber composition for a hose, and a hose that can improve flame retardancy and wear resistance, and ensure workability. A rubber composition for a hose of the present application contains chloroprene rubber, butadiene rubber and styrene-butadiene rubber as rubber components, and silica, and contains 60 parts by mass to 80 parts by mass of chloroprene rubber in 100 parts by mass of the rubber components, the rubber components being compounded with 5 parts by mass to 25 parts by mass of the silica based on 100 parts by mass of the rubber components.