PURPOSE: To obtain a mixed crystal which comprises at least two specific compds., is red, is excellent in coloring power, nonmigrating properties, weatherability, covering properties, dispersibility, and heat resistance, and is useful for coating materials, etc.
CONSTITUTION: This mixed crystal comprises at least two different compds. such as disodium diketopyrrolopyrroledisulfonate of formula I [wherein A and B are each M+n/n or N+H(R1)(R2)(R3) (wherein M is a mono-, di-, or trivalent metal cation; (n) is 1-3; R1 to R3 are each H, a 1-22c alkyl, a 1-24C aralkyl, a 5-6C cycloalkyl, or a 6-18C aryl); (m) is 0 or 1; R is H, a 1-4C alkyl, or a 1-4C alkoxy; and A and B form a composite structure of formula II (wherein (x) is 0.2-0.8) in the compds. forming the mixed crystal].
OROFU BUARUKUISUTO
FURITSUTSU HEREN
TOOMASU AIHIENBERUGAA
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