A rubber composition comprising a diene rubber, a tackifier comprising a resin having a weight average molecular weight of from 1,500 to 2,500, and a wax is disclosed. The wax contains from 20.0 to 40.0 mass % of a linear saturated hydrocarbon having from 25 to 30 carbon atoms, from 8.0 to 18.0 mass % of a linear saturated hydrocarbon having from 35 to 40 carbon atoms, and from 1.0 to 6.0 mass % of a linear saturated hydrocarbon having 45 or more carbon atoms. The amount of the tackifier added is larger than the amount of the wax added.

A rubber compound for making a pneumatic tyre structural component comprising a cross-linkable unsaturated-chain polymer base, a reinforcing filler, a thermosetting resin and a vulcanization system. The thermosetting resin comprises functionalized lignin with —OR groups wherein R is an alkyne group with a number of carbon atoms of between (3) and (18).

According to the process for preparing a vulcanized rubber composition of the invention comprising (a) a step of preparing a master batch comprising a modified conjugated diene polymer and silica, (b) a step of preparing a master batch comprising an isoprene rubber and silica, (c) a step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) a step of vulcanizing a kneaded product obtained in (c), wherein the obtained vulcanized rubber composition comprises a phase A comprising a modified conjugated diene polymer and a phase B comprising an isoprene rubber, which are incompatible with each other, an abundance ratio α of silica in the phase A satisfies 0.5≦α≦0.9 (Relation 1), and a proportion β of the modified conjugated diene polymer satisfies 0.4≦β≦0.8 (Relation 2) it is possible to improve performance on ice and abrasion resistance and to provide a vulcanized rubber composition having excellent performance on ice and abrasion resistance, and a studless tire with a tread made using the same.

A resin composition for a tire, comprising a glyceride compound and a resin having an ester bond.

The present invention provides a pneumatic tire with well improved fuel economy, rubber tensile strength, and abrasion resistance. The present invention relates to a pneumatic tire formed from a rubber composition, the rubber composition containing: a hydrogenated copolymer obtained by copolymerization of an aromatic vinyl compound and a conjugated diene compound, the hydrogenated copolymer having a degree of hydrogenation of the conjugated diene units of 75 mol % or more; silica; and a silane coupling agent 1 containing a carbonylthio group (—S—C(═O)—) but no mercapto group (—SH) and/or a silane coupling agent 2 containing a mercapto group (—SH), the rubber composition containing, per 100% by mass of a rubber component, 75% by mass or more of the hydrogenated copolymer.

A rubber composition comprising silica that has a BET specific surface area of not more than 130 m.sup.2/g and hardness of granulated particles as measured based on JIS K6221-1982 6.3.3 of not less than 23.5 cN can provide a rubber composition which is excellent in rubber physical properties while maintaining energy efficiency. A tire comprising a component consisted of the rubber composition can be also provided.

A pneumatic tire having a tread, a sidewall, a bead portion having a bead core, a bead reinforcing layer reinforcing the bead portion, and a carcass ply moored on a bead core of the bead portion, wherein the bead reinforcing layer and adjacent members adjacent to the bead reinforcing layer are each composed of a rubber composition containing an amine type antioxidant, 0.3 to 8 parts by mass of the amine type antioxidant is contained in the bead reinforcing layer based on 100 parts by mass of the rubber component, and the adjacent member adjacent to the bead reinforcing layer and the bead reinforcing layer satisfy the following formula:
2≤B/A≤8
A: Content (wt %) of amine type antioxidant in bead reinforcing layer.
B: Content (wt %) of amine type antioxidant in the adjacent member.

Provided are: a rubber composition for tires that achieves a balanced improvement in handling stability, crack resistance, ozone resistance, discoloration resistance, tire appearance, fuel economy, tensile strength, and scorch resistance; and a pneumatic tire formed from the rubber composition. The invention relates to a rubber composition for tires containing: a rubber component having a combined content of polybutadiene rubber, natural rubber, and polyisoprene rubber of 90% by mass or more based on 100% by mass of the rubber component; sulfur; and at least one nonionic surfactant selected from the group consisting of a Pluronic nonionic surfactant, and a nonionic surfactant represented by the formula (1) below and/or a nonionic surfactant represented by the formula (2) below, the rubber composition containing, per 100 parts by mass of the rubber component, 2-70 parts by mass of carbon black and 1-5 parts by mass of silica, and being free of silane coupling agents,

##STR00001##

wherein R.sup.1 represents a C6-C26 hydrocarbon group having an unsaturated bond, and d represents an integer,

##STR00002##

wherein R.sup.2 and R.sup.3 are the same or different and each represent a C6-C26 hydrocarbon group, and e represents an integer.

A tire (1) includes a bead member (50) having a bead core (60) and a bead filler located at an outer side of the bead core in the tire radial direction, in which the bead filler (70) is formed of a resin composition, which includes a thermoplastic resin and a thermoplastic elastomer, of which a Tan δ curve obtained by viscoelasticity measurement has at least two peaks, or at least one peak having one or more shoulders, and which has a tensile elastic modulus of from 400 to 1100 MPa.

The present invention provides a molded bale of a rubber composition that is difficult to cold flow, and is difficult to be thermally deteriorated during production, and in which rigidity at 50° C. of a rubber composition for crosslinking obtained therefrom is difficult to be low, and change of tensile strength of the rubber composition for crosslinking after thermal history is small. The rubber composition contains: a rubber-like polymer (A) having an iodine value of 10 to 250, 3% by mass or more of an ethylene structure, and less than 10% by mass of a vinyl aromatic monomer block; aluminum (B); and nickel and/or cobalt (C), in which a content of the aluminum (B) is 2 ppm or more and 200 ppm or less, and a content of the nickel and/or cobalt (C) is 3 ppm or more and 100 ppm or less.