Provided is a novel pressure-sensitive adhesive sheet that is capable of having good light-blocking properties while having an increased refractive index. The pressure-sensitive adhesive sheet provided by the present invention has a pressure-sensitive adhesive layer comprising a black colorant. The pressure-sensitive adhesive sheet has a refractive index of 1.50 or higher.

In a first aspect, the present invention is directed to a rubber composition comprising 70 phr to 95 phr of styrene butadiene rubber comprising at least 5 phr of a first styrene butadiene rubber having a glass transition temperature within a range of −49° C. to −15° C. and at least 45 phr of a second styrene butadiene rubber having a glass transition temperature within a range of −50° C. to −89° C., wherein the rubber composition comprises more of the second styrene butadiene rubber than of the first styrene butadiene rubber. Moreover, the rubber composition comprises 5 phr to 30 phr of one or more of natural rubber and synthetic polyisoprene; 135 phr to 200 phr of silica; and at least 55 phr of at least one hydrocarbon resin comprising at least one terpene resin having a glass transition temperature of at least 30° C.

In a first aspect, the present invention is directed to a rubber composition comprising 70 phr to 95 phr of styrene butadiene rubber comprising at least 5 phr of a first styrene butadiene rubber having a glass transition temperature within a range of −49° C. to −15° C. and at least 45 phr of a second styrene butadiene rubber having a glass transition temperature within a range of −50° C. to −89° C., wherein the rubber composition comprises more of the second styrene butadiene rubber than of the first styrene butadiene rubber. Moreover, the rubber composition comprises 5 phr to 30 phr of one or more of natural rubber and synthetic polyisoprene; 135 phr to 200 phr of silica; and at least 55 phr of at least one hydrocarbon resin comprising at least one terpene resin having a glass transition temperature of at least 30° C.

A method for producing a latex composition, the method comprising a provision step of providing a conjugated diene polymer latex; a preparation step of adding a sulfur-based vulcanizing agent and a xanthogen compound to the conjugated diene polymer latex to prepare a latex composition before aging; and an aging step of, after the preparation of the latex composition before aging, aging the prepared latex composition before aging through storing of the latex composition at a temperature of 5 to 60° C. for 12 hours to 14 days, wherein the pH of the latex composition after 12 hours from the start of aging in the aging step is controlled to 9 or more.

A method for producing a latex composition, the method comprising a provision step of providing a conjugated diene polymer latex; a preparation step of adding a sulfur-based vulcanizing agent and a xanthogen compound to the conjugated diene polymer latex to prepare a latex composition before aging; and an aging step of, after the preparation of the latex composition before aging, aging the prepared latex composition before aging through storing of the latex composition at a temperature of 5 to 60° C. for 12 hours to 14 days, wherein the pH of the latex composition after 12 hours from the start of aging in the aging step is controlled to 9 or more.

A polymer having a hydrophobic polymer chain derived from monomers of farnesene and other optional monomers, such as dienes and vinyl aromatics. The polymer also includes one or more terminal functional groups, such as an amino group, a glycidyl group, a carboxylic acid group, a (meth)acrylate group, a silane group, an isocyanate group, an acetoacetate group, a phenolic group, and a hydroxyl group. Functional groups, such as carboxylic acids, may also be grafted along the hydrophobic polymer chain. The polymer may be incorporated in curable compositions that optionally include one or more polymer resins having similar functional groups. Methods for preparing the curable polymer compositions are also provided. The curable or cured form of the polymer composition may be used in various products, such as a sealant, a coating, a caulk, an electric potting compound, a membrane, a sponge, a foam, an adhesive, or a propellant binder.

A polymer having a hydrophobic polymer chain derived from monomers of farnesene and other optional monomers, such as dienes and vinyl aromatics. The polymer also includes one or more terminal functional groups, such as an amino group, a glycidyl group, a carboxylic acid group, a (meth)acrylate group, a silane group, an isocyanate group, an acetoacetate group, a phenolic group, and a hydroxyl group. Functional groups, such as carboxylic acids, may also be grafted along the hydrophobic polymer chain. The polymer may be incorporated in curable compositions that optionally include one or more polymer resins having similar functional groups. Methods for preparing the curable polymer compositions are also provided. The curable or cured form of the polymer composition may be used in various products, such as a sealant, a coating, a caulk, an electric potting compound, a membrane, a sponge, a foam, an adhesive, or a propellant binder.

The present invention refers to a tyre for bicycle wheels comprising a tread band containing an anti-puncture system capable of having high resistance to the penetration of foreign bodies, simultaneously ensuring optimal handling performances. In particular the present invention regards a tyre for bicycle wheels comprising: a carcass structure; and—a tread band arranged in radially outer position with respect to the carcass structure; wherein said tread band is made by means of vulcanisation of a cross-linkable elastomeric composition comprising a reinforcement system constituted by modified silicate fibres of nanometric size and fibrillated polymer fibres of micrometric size.

The present invention refers to a tyre for bicycle wheels comprising a tread band containing an anti-puncture system capable of having high resistance to the penetration of foreign bodies, simultaneously ensuring optimal handling performances. In particular the present invention regards a tyre for bicycle wheels comprising: a carcass structure; and—a tread band arranged in radially outer position with respect to the carcass structure; wherein said tread band is made by means of vulcanisation of a cross-linkable elastomeric composition comprising a reinforcement system constituted by modified silicate fibres of nanometric size and fibrillated polymer fibres of micrometric size.

The present invention provides a rubber composition for tires which provides improved abrasion resistance, and a pneumatic tire containing the rubber composition. The present invention relates to a rubber composition for tires containing a rubber component including at least 80% by mass in total of at least one of an isoprene-based rubber, a polybutadiene rubber, or a styrene-butadiene rubber, the rubber composition containing, per 100 parts by mass of the rubber component, 3 to 250 parts by mass of a reinforcing filler and 0.2 to 10 parts by mass of a specific tetrazine compound.