Claims
- 1. A process for the preparation of a pigment composition comprising reacting a succinic acid diester with 4-methylbenzonitrile and 3-methylbenzonitrile in an organic solvent, in the presence of a base, at a temperature range from 60 to 140° C., using the benzonitriles in a molar ratio of from 45 to 25 mol % 4-methylbenzonitrile to from 55 to 75 mol % 3-methylbenzonitrile.
- 2. A process according to claim 1, wherein the pigment composition is a ternary pigment composition comprising compounds of formulae (I), (II) and (III) having a colour shade angle h in the range from 35 to 45 and a hiding power ΔE*−S/W of <8, the crystal lattice of which composition has twice the glancing angle (2 theta) at 7.8; 12.5; 14.0; 15.5; 19.1; 21.1; 23.7; 26.1 and 32.2 (+/−0.5 2 theta) in the X-ray spectrum.
- 3. A method of pigmenting organic material which comprises blending organic material with a tinctorially effective amount of a pigment composition prepared according to claim 1.
Priority Claims (1)
Number |
Date |
Country |
Kind |
155/00 |
Jan 2000 |
CH |
|
Parent Case Info
This application is a continuation of application Ser. No. 09/755,368 filed Jun. 5, 2001, abandoned.
US Referenced Citations (26)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2238550 |
Jun 1991 |
GB |
2 238 550 |
Jun 1991 |
GB |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09/755368 |
Jan 2001 |
US |
Child |
10/242144 |
|
US |