Claims
- 1. A 1,4-diketopyrrolo[3,4-c]pyrrole of formula ##STR38## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of one another hydrogen, Cl, Br, CH.sub.3, OCH.sub.3, CN or phenyl, and at least one of the substituents R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is a group
- --O(CH.sub.2).sub.n X or --O(CH.sub.2 CH.sub.2 O).sub.p CH.sub.2 CH.sub.2 X
- wherein
- n is an integer from 2 to 12, and
- p is an integer from 1 to 3,
- X is a heterocyclic radical selected from the group consisting of pyrrolyl and indolyl.
- 2. A 1,4-diketopyrrolo[3,4-c]pyrrole of formula I according to claim 1, wherein at least one of R.sub.l, R.sub.2, R.sub.3 or R.sub.4 is a group
- --O(CH.sub.2).sub.n X or --O(CH.sub.2 CH.sub.2 O).sub.p CH.sub.2 CH.sub.2 X
- wherein
- n and p are as defined in claim 1, and X is pyrrolyl.
- 3. A 1,4-diketopyrrolo[3,4-c]pyrrole of formula I according to claim 1, wherein one or two of R.sub.1, R.sub.2, R.sub.3 or R.sub.4 are a group
- --O(CH.sub.2).sub.n X or --O(CH.sub.2 CH.sub.2 O).sub.p CH.sub.2 CH.sub.2 X
- wherein
- n is an integer from 2 to 6 and
- p is an integer from 1 or 2, and
- X is pyrrolyl.
- 4. A pigment composition comprising
- a) 80-99.9% by weight of at least one 1,4-diketopyrrolo[3,4-c]pyrrole of formula I, wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of one another hydrogen, Cl, Br, CH.sub.3, OCH.sub.3, CN or phenyl, and
- b) 0.1-20% by weight of at least one 1,4-diketopyrrolo[3,4-c]pyrrole of formula I according to claim 1.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1250/91 |
Apr 1991 |
CHX |
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Parent Case Info
This is a divisional of Ser. No. 07/991,676, filed Dec. 16, 1992, now U.S. Pat. No. 5,342,955 which is a divisional of Ser. No. 07/870,986, filed Apr. 20, 1992, now U.S. Pat. No. 5,200,528.
US Referenced Citations (4)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0133156 |
Feb 1985 |
EPX |
0321919 |
Jun 1989 |
EPX |
3832064 |
Mar 1990 |
DEX |
3-26767 |
Jan 1991 |
JPX |
Non-Patent Literature Citations (2)
Entry |
Chem. Abst. 111: 196751y (1989). |
Chem. Abst. 113: 61388f (1990). |
Divisions (2)
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Number |
Date |
Country |
Parent |
991676 |
Dec 1992 |
|
Parent |
870986 |
Apr 1992 |
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