An object of the present invention is to provide a rubber composition capable of producing a pneumatic tire with both excellent low rolling resistance and wet grip performance, and a pneumatic tire comprising the rubber composition. The rubber composition comprises: a diene-based rubber containing 10 mass % or greater of a modified diene polymer; and an aromatic modified terpene resin; wherein the modified diene polymer is a modified polymer obtained by modifying an unmodified diene polymer (A) with a nitrone compound (B) having a carboxy group; and a content of the aromatic modified terpene resin is from 0.1 to 50 parts by mass per 100 parts by mass of the diene-based rubber.

An object of the present invention is to provide a rubber composition capable of producing a pneumatic tire with both excellent low rolling resistance and wet grip performance, and a pneumatic tire comprising the rubber composition. The rubber composition comprises: a diene-based rubber containing 10 mass % or greater of a modified diene polymer; and an aromatic modified terpene resin; wherein the modified diene polymer is a modified polymer obtained by modifying an unmodified diene polymer (A) with a nitrone compound (B) having a carboxy group; and a content of the aromatic modified terpene resin is from 0.1 to 50 parts by mass per 100 parts by mass of the diene-based rubber.

Provided is a studless winter tire which provides good performance on ice and snow and good abrasion resistance, and suffers little change in hardness and little discoloration on the tire surface. The present invention relates to a studless winter tire including a tread formed from a rubber composition containing a predetermined amount of a farnesene resin obtained by polymerizing farnesene. The present invention relates to a studless winter tire including a tread formed from a rubber composition containing a predetermined amount of at least one myrcene resin selected from the group consisting of myrcene polymers with a Mw of 1,000-500,000, myrcene-butadiene copolymers with a Mw of 1,000-500,000, and myrcene-styrene copolymers with a Mw of 1,000-150,000; and a predetermined amount of a silica with an N.sub.2SA of 40-400 m.sup.2/g, the rubber component containing a predetermined amount of a high-cis polybutadiene with a cis content of 95% by mass or more.

Provided is a studless winter tire which provides good performance on ice and snow and good abrasion resistance, and suffers little change in hardness and little discoloration on the tire surface. The present invention relates to a studless winter tire including a tread formed from a rubber composition containing a predetermined amount of a farnesene resin obtained by polymerizing farnesene. The present invention relates to a studless winter tire including a tread formed from a rubber composition containing a predetermined amount of at least one myrcene resin selected from the group consisting of myrcene polymers with a Mw of 1,000-500,000, myrcene-butadiene copolymers with a Mw of 1,000-500,000, and myrcene-styrene copolymers with a Mw of 1,000-150,000; and a predetermined amount of a silica with an N.sub.2SA of 40-400 m.sup.2/g, the rubber component containing a predetermined amount of a high-cis polybutadiene with a cis content of 95% by mass or more.

The present invention is a hydrogenated block copolymer obtained by hydrogenating a block copolymer [C] that comprises polymer blocks [A] and polymer block [B], a ratio (wA:wB) of a weight fraction wA of the polymer blocks [A] and a weight fraction wB of the polymer block [B] in the block copolymer [C] being 45:55 to 65:35, a ratio (w[I.sub.B]:w[II.sub.B]) of a weight fraction w[I.sub.B] of the repeating unit [I] derived from an aromatic vinyl compound and a weight fraction w[II.sub.B] of the repeating unit [II] derived from a linear conjugated diene compound in the polymer block [B] being 40:60 to 55:45, 90% of more of unsaturated bonds included in the block copolymer [C] having been hydrogenated, a weight average molecular weight of 60,000 to 150,000, a low-temperature-side glass transition temperature [Tg.sub.1] of 0° C. or more and a high-temperature-side glass transition temperature [Tg.sub.2] of 135° C. or more, and a stretched film.

The present invention is a hydrogenated block copolymer obtained by hydrogenating a block copolymer [C] that comprises polymer blocks [A] and polymer block [B], a ratio (wA:wB) of a weight fraction wA of the polymer blocks [A] and a weight fraction wB of the polymer block [B] in the block copolymer [C] being 45:55 to 65:35, a ratio (w[I.sub.B]:w[II.sub.B]) of a weight fraction w[I.sub.B] of the repeating unit [I] derived from an aromatic vinyl compound and a weight fraction w[II.sub.B] of the repeating unit [II] derived from a linear conjugated diene compound in the polymer block [B] being 40:60 to 55:45, 90% of more of unsaturated bonds included in the block copolymer [C] having been hydrogenated, a weight average molecular weight of 60,000 to 150,000, a low-temperature-side glass transition temperature [Tg.sub.1] of 0° C. or more and a high-temperature-side glass transition temperature [Tg.sub.2] of 135° C. or more, and a stretched film.

There is provided a pneumatic tire having improved wet grip performance and fuel efficiency in a good balance. The pneumatic tire is provided with a tread composed of a rubber composition comprising not less than 0.5 part by mass of silica and not less than 5 parts by mass of a resin based on 100 parts by mass of a rubber component comprising 40 to 100% by mass of a styrene-butadiene rubber and 0 to 60% by mass of a butadiene rubber, wherein an adhesive force of the rubber composition measured by the specified adhesion test method is not less than 300 when an adhesive force of a reference rubber composition wherein the whole amount of resin has been replaced by oil is assumed to be 100, and a ratio of a loss tangent tan δ.sub.0° C. at 0° C. of the rubber composition to a loss tangent tan δ.sub.70° C. at 70° C. of the rubber composition (tan δ.sub.0° C./tan δ.sub.70° C. is from 3.0 to 10.

There is provided a pneumatic tire having improved wet grip performance and fuel efficiency in a good balance. The pneumatic tire is provided with a tread composed of a rubber composition comprising not less than 0.5 part by mass of silica and not less than 5 parts by mass of a resin based on 100 parts by mass of a rubber component comprising 40 to 100% by mass of a styrene-butadiene rubber and 0 to 60% by mass of a butadiene rubber, wherein an adhesive force of the rubber composition measured by the specified adhesion test method is not less than 300 when an adhesive force of a reference rubber composition wherein the whole amount of resin has been replaced by oil is assumed to be 100, and a ratio of a loss tangent tan δ.sub.0° C. at 0° C. of the rubber composition to a loss tangent tan δ.sub.70° C. at 70° C. of the rubber composition (tan δ.sub.0° C./tan δ.sub.70° C. is from 3.0 to 10.

A coating composition contains (A) an acrylate component and (B) a metal oxide. A mass ratio (B)/(A) is from 0.6 to 1.3, (A) contains the components (a-1), (a-2) and (a-3), and a content ratio X of (a-1), a content ratio Y of (a-2) and a content ratio Z of (a-3) satisfies the conditions (1) and (2): (a-1): a polyfunctional acrylate compound having 3 or more acrylate groups in one molecule; (a-2): a dendritic aliphatic compound having an acrylate group at an end thereof; and (a-3): a modified acrylate compound having been modified with an alkylene oxide or ε-caprolactone. The condition (1): in (A), X is from 40 to 60% by mass, and a total of Y and Z is from 60 to 40% by mass, and the condition (2): in the total of Y and Z, Z is 30% by mass or more and less than 100% by mass.

A coating composition contains (A) an acrylate component and (B) a metal oxide. A mass ratio (B)/(A) is from 0.6 to 1.3, (A) contains the components (a-1), (a-2) and (a-3), and a content ratio X of (a-1), a content ratio Y of (a-2) and a content ratio Z of (a-3) satisfies the conditions (1) and (2): (a-1): a polyfunctional acrylate compound having 3 or more acrylate groups in one molecule; (a-2): a dendritic aliphatic compound having an acrylate group at an end thereof; and (a-3): a modified acrylate compound having been modified with an alkylene oxide or ε-caprolactone. The condition (1): in (A), X is from 40 to 60% by mass, and a total of Y and Z is from 60 to 40% by mass, and the condition (2): in the total of Y and Z, Z is 30% by mass or more and less than 100% by mass.