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Abstract

In the step (I), the period (minute(s)) for dispersing the carbon black species A showing a nitrogen adsorption specific surface area (N₂SA-(A)value) of 130 m²/g or less in the dispersing solvent and that minute(s)) for dispersing the carbon black species B showing an N₂SA-(B) value lower than the N₂SA-(A) value by 25 m²/g or more in the dispersing solvent by α(A) and α(B), respectively, and further representing the rotation number (rpm) of a rotor of a dispersing machine used in the dispersing when the carbon black species A is dispersed, and that (rpm) of a rotor of a dispersing machine used in the dispersing when the carbon black species B is dispersed by β(A) and β(B), respectively, the following expression is satisfied:

description='In-line Formulae' end='lead'1.1α(B)×β(B)≦α(A)×β(A)≦1.5α(B)×β(B)   (1).description='In-line Formulae' end='tail'

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First Claim