A rubber composition is based on at least one diene elastomer, a reinforcing filler and a 1,3-dipolar compound bearing an imidazole functional group. Such a composition exhibits an improved compromise in certain properties such as stiffness in the cured state and hysteresis.

The invention provides a rubber composition prepared by mixing, per 100 parts by mass of a rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific guanidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan . The invention also provides a pneumatic tire using the rubber composition.

The invention provides a rubber composition prepared by mixing, per 100 parts by mass of a rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific guanidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan . The invention also provides a pneumatic tire using the rubber composition.

A method of preventing formation of rust on a metal surface is provided. The method may include applying a polyamine onto the metal surface and applying a compound of formula (I) or salt thereof onto the metal surface. The compositions and methods disclosed herein may be used to inhibit corrosion of a metal surface in contact with an aqueous system. ##STR00001##

A method of preventing formation of rust on a metal surface is provided. The method may include applying a polyamine onto the metal surface and applying a compound of formula (I) or salt thereof onto the metal surface. The compositions and methods disclosed herein may be used to inhibit corrosion of a metal surface in contact with an aqueous system. ##STR00001##

The invention provides a rubber composition prepared by mixing, per 100 parts by mass of a rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific guanidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan . The invention also provides a pneumatic tire using the rubber composition.

The invention provides a rubber composition prepared by mixing, per 100 parts by mass of a rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific guanidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan . The invention also provides a pneumatic tire using the rubber composition.

Charge Transfer Salt, Electronic Device and Method of Forming the Same A charge-transfer salt formed from a material comprising a unit of formula (I) and an n-dopant: wherein Ar.sup.1 is an arylene group; R.sup.1 is a substituent comprising at least one cyano group; n is at least 1; R.sup.2 is a substituent; and m is 0 or a positive integer. The material may be a polymer. The charge-transfer salt may be used as a layer of an organic electronic device.

##STR00001##

Charge Transfer Salt, Electronic Device and Method of Forming the Same A charge-transfer salt formed from a material comprising a unit of formula (I) and an n-dopant: wherein Ar.sup.1 is an arylene group; R.sup.1 is a substituent comprising at least one cyano group; n is at least 1; R.sup.2 is a substituent; and m is 0 or a positive integer. The material may be a polymer. The charge-transfer salt may be used as a layer of an organic electronic device.

##STR00001##

The disclosure concerns polymer compositions exhibiting LDS properties while maintaining mechanical properties and a dark color throughout the composition.