Patent ID: 11873407
Assignee: CINIC CHEMICALS (SHANGHAI) CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 1:
2. A method for preparing the diketopyrrolopyrrole pigment compound of claim 1, comprising:
S1, mixing and reacting succinic acid diester with a nitrile selected from 3,5-dicyano-4-methylbenzonitrile for compound (1-1), 3,5-dibromo-4-ethylbenzonitrile for compound (1-2), 3-iodo-4-isopropylbenzonitrile for compound (1-3), 3,6-difluoro-4-phenylbenzonitrile for compound (1-4), 2-bromo-4-n-dodecyl-6-chlorobenzonitrile for compound (1-5), 3,5-dibromo-4-n-octadecylbenzonitrile for compound (1-6), 3-chloro-4-tert-butylbenzonitrile for compound (1-7), 3-iodo-4-ethyl-6-fluorobenzonitrile for compound (1-8), or 2,6-dicyano-4-phenylbenzonitrile for compound (1-9) in an organic solvent in the presence of alkali at a temperature of 60° C. to 180° C. to obtain a pigment alkali metal salt intermediate;
S2, mixing the pigment alkali metal salt intermediate with a hydrolysis liquid, performing hydrolysis at a temperature of −20° C. to 180° C., and performing a post-treatment to obtain the diketopyrrolopyrrole pigment compound.