Claims
- 1. Crystallographically unitary crystal pigments in the crystal lattice of the .alpha.-modification of the N,N'-bis-3',5'-dimethylphenylperylenetetracarbamide of the following formula ##STR5## produced by condensing 1 mole of perylenetetracarboxylic dianhydride with an excess of up to 30 moles of 3,5-dimethylaniline which contains in total 0.5-6 percent by weight of 4-ethoxyaniline and/or 4-methoxyaniline
- to form crystallographically unitary crystal pigments comprised of essentially symmetrical N,N'-bis-3'5'-dimethylphenylperylene-tetracarbimide of the formula (1)
- and at least one asymmetrically substituted diimide of the formula (2) in which R stands for a methyl or ethyl group ##STR6##
Priority Claims (1)
Number |
Date |
Country |
Kind |
3436206 |
Oct 1984 |
DEX |
|
REFERENCE TO RELATED APPLICATION
This is a continuation under 37 CFR 1.62 of copending U.S. application Ser. No. 782,498 filed Oct. 1, 1985 by Ernst Spietschka and Helmut Troster for Mix-Crystal Pigments based on Perylenetetracarbimides, Process for Preparing Their Use, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3554776 |
Gerson et al. |
Jan 1971 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
1094897 |
Dec 1960 |
DEX |
2009073 |
Sep 1970 |
DEX |
51-7025 |
Jan 1976 |
JPX |
897707 |
May 1962 |
GBX |