Patent ID: 7105046

Claim:
A process for producing a black perylene-based pigment comprising calcining at least one compound selected from the group consisting of compounds represented by the following formulae (I) to (III), at a temperature of 200 to 600° C. in vacuum or in an inert gas atmosphere wherein R 1 and R 2 are identical to each other and are independently a butyl group, phenylethyl group, methoxyethyl group and 4-methoxyphenylmethyl group; and R 3 and R 4 which may be same or different are independently a phenylene group, alkylphenylene group, alkoxyphenylene group, hydroxyphenylene group, halogenated phenylene group, pyridinediyl group, alkylpyridinediyl group, alkoxypyridinediyl group, halogenated pyridinediyl group and naphthalenediyl group.