Provided is a composition capable of forming an optically anisotropic film exhibiting reverse wavelength dispersibility and an Nz factor of about 0.50 (0.40 to 0.60); as well as an optically anisotropic, a circularly polarizing plate, and a display device. The composition includes a non-colorable rod-like compound having an acid group or a salt thereof, a non-colorable plate-like compound having an acid group or a salt thereof, and a salt consisting of a cation and an anion, and exhibiting lyotropic liquid crystallinity, in which a ratio W obtained by Expression (W) is 0.25 to 1.75, and a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the rod-like compound is smaller than a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the plate-like compound.

[00001]$\begin{array}{cc}\mathrm{Ratio}W=\frac{\left(C1+C2+C3\right)-\left(A1+A2\right)}{A2}& \left(W\right)\end{array}$

An aqueous adhesive for rubber of the present disclosure includes: a base agent containing rubber latex as a main component thereof; and an organic solvent that causes swelling of a rubber component in the rubber latex. An amount of the organic solvent in the aqueous adhesive for rubber is not less than 25% by mass and not greater than 60% by mass of a total amount of the base agent and the organic solvent. A boiling point of the organic solvent is preferably not higher than 140° C. A tennis ball of the present disclosure includes a hollow core made of a rubber material. The hollow core includes two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for rubber.

An aqueous adhesive for rubber of the present disclosure includes: a base agent containing rubber latex as a main component thereof; and an organic solvent that causes swelling of a rubber component in the rubber latex. An amount of the organic solvent in the aqueous adhesive for rubber is not less than 25% by mass and not greater than 60% by mass of a total amount of the base agent and the organic solvent. A boiling point of the organic solvent is preferably not higher than 140° C. A tennis ball of the present disclosure includes a hollow core made of a rubber material. The hollow core includes two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for rubber.

The present invention provides a rubber composition obtained by kneading a rubber component, a vulcanization accelerator, silica, and a compound represented by the following formula (I): ##STR00001##
wherein the groups are as defined in the DESCRIPTION.

The present invention provides a rubber composition obtained by kneading a rubber component, a vulcanization accelerator, silica, and a compound represented by the following formula (I): ##STR00001##
wherein the groups are as defined in the DESCRIPTION.

The present invention provides a rubber composition obtained by kneading a rubber component, a vulcanization accelerator, silica, and a compound represented by the following formula (I): ##STR00001##
wherein the groups are as defined in the DESCRIPTION.

Provided is a rubber composition having excellent low heat generating properties. The rubber composition of the present disclosure contains a rubber component, a filler containing silica, and a silane coupling agent, where the rubber component contains a conjugated diene-based polymer modified with a modifier containing a compound represented by the formula (1), and the silane coupling agent is a compound represented by the formula (2).

##STR00001##

Provided is a rubber composition having excellent low heat generating properties. The rubber composition of the present disclosure contains a rubber component, a filler containing silica, and a silane coupling agent, where the rubber component contains a conjugated diene-based polymer modified with a modifier containing a compound represented by the formula (1), and the silane coupling agent is a compound represented by the formula (2).

##STR00001##

A rubber composition is based on an elastomeric matrix comprising from 40 to 80 phr of at least one butadiene elastomer, a vulcanization system comprising sulfur and a vulcanization accelerator, in which the weight ratio of sulfur to vulcanization accelerator is strictly less than 1, and at least 55 phr of organic filler mainly comprising a carbon black, called black G, having a BET specific surface area ranging from 15 to 50 m.sup.2/g and a compressed oil absorption number (COAN) in a range of from 40 to 100 ml/100 g.

A rubber composition is based on an elastomeric matrix comprising from 40 to 80 phr of at least one butadiene elastomer, a vulcanization system comprising sulfur and a vulcanization accelerator, in which the weight ratio of sulfur to vulcanization accelerator is strictly less than 1, and at least 55 phr of organic filler mainly comprising a carbon black, called black G, having a BET specific surface area ranging from 15 to 50 m.sup.2/g and a compressed oil absorption number (COAN) in a range of from 40 to 100 ml/100 g.