US5154770A
Expired / Lapsed
US
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Mix-crystal pigments based on perylenetetracarbimides, process for their preparation and their use
Assignee: Hoechst AG
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Filing: 1990-09-19
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Granted: 1992-10-13
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Expires: 2010-09-19
Abstract
Abstract Perylenetetracarbimide mix-crystal pigments in the crystal lattice of the alpha -modification of N,N'-bis-3',5'-dimethylphenylperylenetetracarbimide of the formula (1) comprising 99-70 mole percent of the symmetrical diimide of the formula (1) and correspondingly 1-30 mole percent of the asymmetrically substituted diimide of the formula (2) <IMAGE> <IMAGE> process for their preparation and their use for coloring organic polymers.
Inventors
- 👤 Ernst Spietschka
- 👤 Helmut Troster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:10
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/62; C09B67/00; C09B67/0033; C09B67/0034
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
45 words
A perylenetetracarbimide mix-crystal pigment based on the crystal lattice of the α-modification of N,N'-bis-3',5'-dimethylphenylperylenetetracarbimide of the formula (1) comprising 99-70 mole percent of the symmetrical diimide of the formula (1) and correspondingly 1-30 mole percent of the asymmetrically substituted diimide of the formula (2) ##STR6##
Claim 2
Dependent Claim
45 words
A perylenetetracarbimide mix-crystal pigment based on the crystal lattice of the α-modification of N,N'-bis-3',5'-dimethylphenylperylenetetracarbimide of the formula (1) comprising 99-70 mole percent of the symmetrical diimide of the formula (1) and correspondingly 1-30 mole percent of the asymmetrically substituted diimide of the formula (2) ##STR6##
Claim 3
Dependent Claim
36 words
The perylenetetracarbimide mix-crystal pigment as claimed in claim 1 consisting essentially of 95-85 mole percent of the diimide of the formula (1) and correspondingly 5 to 15 mole percent of the diimide of the formula (2).
References Cited (Backward Citations)
CA912757A
Cited
US2905685A
Cited
US2905686A
Cited
GB897707A
Cited
DE1094897B
Cited
US3554776A
Cited
DE1807729A1
Cited
DE2009073A1
Cited
JPS517025A
Cited
US4262851A
Cited
EP0122442A1
Cited
US4769460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |