US5084573A
Expired / Lapsed
US
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2,9-dichloroquinacridone in platelet form
Assignee: BASF Corp
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Filing: 1990-07-13
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Granted: 1992-01-28
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Expires: 2010-07-13
Abstract
Abstract 2,9-Dichloroquinacridone in platelet form having a length of 1-45 μm, a width of 0.1-20 μm and a thickness of 0.05-5 μm; a process for the preparation thereof comprising conversion of the crude material in a polar solvent in the presence of a long chain thiol compound and a base; and the pigmentary use of said platelets.
Inventors
- 👤 Fridolin Babler
- 👤 Edward E. Jaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:53
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0025; C09B67/0027; C09B67/0001; C09B67/0014
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
2,9-Dichloroquinacridone in platelet form having a length of 1-45 μm, a width of 0.1-20 μm and a thickness of 0.05-5 μm.
Claim 2
Dependent Claim
21 words
2,9-Dichloroquinacridone in platelet form having a length of 1-45 μm, a width of 0.1-20 μm and a thickness of 0.05-5 μm.
Claim 3
Dependent Claim
58 words
A process for the preparation of the 2,9-dichloroquinacridone of claim 1 in platelet and pigmentary form, which comprises recrystallizing crude 2,9-dichloroquinacridone from a polar solvent at elevated temperatures of from 50° C. to reflux temperatures in the presence of a C 6 -C 18 thiol compound and an alkali metal hydroxide or methoxide base and recovering the platelets.
Claim 4
Dependent Claim
21 words
The process of claim 2, wherein said polar solvent is selected from the group consisting of N,N,N',N'-tetramethylurea, N,N-dimethylacetamide, N-methylformamide and N,N-dimethylformamide.
Claim 5
Dependent Claim
13 words
The process of claim 2, wherein said thiol compound has 10-14 carbon atoms.
Claim 6
Dependent Claim
15 words
The process of claim 2 conducted in the presence of N,N-dimethylformamide, dodecanethiol-1 and sodium methoxide.
Claim 7
Dependent Claim
58 words
The process of claim 2, wherein 5-20 parts, by weight, of said polar solvent are utilized per part, by weight, of the crude 2,9-dichloroquinacridone; the molar ratio of the crude 2,9-dichloroquinacridone to the C 6 -C 18 thiol compound is 1:1.0-5.0; and the C 6 -C 18 thiol compound and the base are present in substantially equimolar amounts.
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) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |