Provided are a rubber composition which provides a self-healing rubber with improved strength and wet grip performance, and a pneumatic tire including the rubber composition. The present disclosure relates to a rubber composition containing a rubber component having a functional group containing a cationic functional group and/or an anionic functional group, a filler capable of generating a charge paired with the functional group, and sulfur.

A resin composition for a refrigerant-transporting hose contains a thermoplastic resin and an elastomer, the thermoplastic resin and the elastomer forming a sea-island structure of a matrix of the thermoplastic resin and a domain of the elastomer, the resin composition having a P(O.sub.2), an M10, and a P(H.sub.2O) satisfying2: 0 < P(O.sub.2) x M10 ≤ 150 and log(P(H.sub.2O)/P(O.sub.2)) ≤ 0.9, where the P(O.sub.2) is an oxygen permeability coefficient [cm.Math.cm.sup.3/(cm.sup.2.Math.s.Math.cmHg)] at a temperature of 21° C. and a relative humidity of 50%, the M10 is a 10% modulus [MPa] at a temperature of 25° C., and the P(H.sub.2O) is a water vapor permeability coefficient [cm.Math.cm.sup.3/(cm.sup.2.Math.s.Math.cmHg)] at a temperature of 60° C. and a relative humidity of 100%.

A resin composition for a refrigerant-transporting hose contains a thermoplastic resin and an elastomer, the thermoplastic resin and the elastomer forming a sea-island structure of a matrix of the thermoplastic resin and a domain of the elastomer, the resin composition having a P(O.sub.2), an M10, and a P(H.sub.2O) satisfying2: 0 < P(O.sub.2) x M10 ≤ 150 and log(P(H.sub.2O)/P(O.sub.2)) ≤ 0.9, where the P(O.sub.2) is an oxygen permeability coefficient [cm.Math.cm.sup.3/(cm.sup.2.Math.s.Math.cmHg)] at a temperature of 21° C. and a relative humidity of 50%, the M10 is a 10% modulus [MPa] at a temperature of 25° C., and the P(H.sub.2O) is a water vapor permeability coefficient [cm.Math.cm.sup.3/(cm.sup.2.Math.s.Math.cmHg)] at a temperature of 60° C. and a relative humidity of 100%.

A rubber protective wax, comprising hydrocarbon compounds, a polyethylene wax and an antidegradant. The rubber protective wax of the present invention can render rubber good thermal oxidative aging resistance, static ozone aging resistance, dynamic ozone aging resistance, flex cracking resistance and tensile fatigue resistance, and has good protection effects in both static environment and dynamic load environment.

A rubber protective wax, comprising hydrocarbon compounds, a polyethylene wax and an antidegradant. The rubber protective wax of the present invention can render rubber good thermal oxidative aging resistance, static ozone aging resistance, dynamic ozone aging resistance, flex cracking resistance and tensile fatigue resistance, and has good protection effects in both static environment and dynamic load environment.

A rubber protective wax, comprising hydrocarbon compounds, a polyethylene wax and an antidegradant. The rubber protective wax of the present invention can render rubber good thermal oxidative aging resistance, static ozone aging resistance, dynamic ozone aging resistance, flex cracking resistance and tensile fatigue resistance, and has good protection effects in both static environment and dynamic load environment.

A vulcanizable rubber composition comprises an interpenetrating or ionic network (IPN)-promoting resin. The resin comprises side chain functional groups along the resin backbone, which, in the presence of an additive material, form the connections that make up the IPN. In one embodiment, such material is ZnO. A method for forming the rubber composition comprises, in a productive step, mixing the product of the non-productive step, the zinc oxide, and a resin derived from maleic anhydride. The zinc oxide and the resin are simultaneously added to the composition during the productive mixing stage. The rubber composition can be cured and incorporated in a tire component, such as, a tread.

A vulcanizable rubber composition comprises an interpenetrating or ionic network (IPN)-promoting resin. The resin comprises side chain functional groups along the resin backbone, which, in the presence of an additive material, form the connections that make up the IPN. In one embodiment, such material is ZnO. A method for forming the rubber composition comprises, in a productive step, mixing the product of the non-productive step, the zinc oxide, and a resin derived from maleic anhydride. The zinc oxide and the resin are simultaneously added to the composition during the productive mixing stage. The rubber composition can be cured and incorporated in a tire component, such as, a tread.

Provided is a thermoplastic elastomer composition obtained by melt-kneading (A) an ethylene/α-olefin/non-conjugated polyene copolymer rubber that is a copolymer of ethylene, an α-olefin having 3 to 20 carbon atoms and a non-conjugated polyene, (B) a polyolefin resin and (C) a mineral oil-based softening agent in the presence of (D) a crosslinking agent, at least part of the ethylene/α-olefin/non-conjugated polyene copolymer rubber (A) being crosslinked, the thermoplastic elastomer composition having a sea-island structure in which the ethylene/α-olefin/non-conjugated polyene copolymer rubber (A) is dispersed as a dispersed phase (island phase) in a continuous phase (sea phase) of the polyolefin resin (B), and when a cross-section of the composition is observed with an atomic force microscope (AFM), a ratio of (b) a local elastic modulus of the continuous phase to (a) a local elastic modulus of the dispersed phase being from 10 to 30.

Provided is a thermoplastic elastomer composition obtained by melt-kneading (A) an ethylene/α-olefin/non-conjugated polyene copolymer rubber that is a copolymer of ethylene, an α-olefin having 3 to 20 carbon atoms and a non-conjugated polyene, (B) a polyolefin resin and (C) a mineral oil-based softening agent in the presence of (D) a crosslinking agent, at least part of the ethylene/α-olefin/non-conjugated polyene copolymer rubber (A) being crosslinked, the thermoplastic elastomer composition having a sea-island structure in which the ethylene/α-olefin/non-conjugated polyene copolymer rubber (A) is dispersed as a dispersed phase (island phase) in a continuous phase (sea phase) of the polyolefin resin (B), and when a cross-section of the composition is observed with an atomic force microscope (AFM), a ratio of (b) a local elastic modulus of the continuous phase to (a) a local elastic modulus of the dispersed phase being from 10 to 30.