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US4769460A
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Mix-crystal pigments based on perylenetetracarbimides, process for preparing and their use
Assignee: Hoechst AG
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Filing: 1988-01-20
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Granted: 1988-09-06
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Expires: 2008-01-20
Abstract
Abstract Process for preparing perylenetetracarbimide mix-crystal pigments in the crystal lattice of the α-modification of the N,N'-bis-3',5'-dimethylphenylperylenetetracarbimide of the formula (1) comprising essentially symmetrical N,N'-bis-3',5'-dimethylphenylperylenetetracarbimide of the formula (1) and at least one asymmetrically substituted diimide of the formula (2) in which R stands for methyl or ethyl ##STR1## 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 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 14:43
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0033; C09B67/0034; C09B5/00; C09B5/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
Crystallographically unitary crystal pigments in the crystal lattice of the α-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##
Claim 2
Dependent Claim
86 words
Crystallographically unitary crystal pigments in the crystal lattice of the α-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##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |