US4895948A
Expired / Lapsed
US
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Process for preparation of opaque quinacridones
Assignee: BASF Corp
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Filing: 1988-06-20
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Granted: 1990-01-23
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Expires: 2008-06-20
Abstract
Abstract A process for preparing opaque pigmentary quinacridone derivatives which comprises milling the starting quinacridone materials at ambient or near ambient temperatures in the presence of an alcohol and a base.
Inventors
- 👤 Edward E. Jaffe
- 👤 Johannes Pfenninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:13
CPC Classifications
C; C09; C09B; C09B48/00; C09B67/00; C09B67/0001; C09B67/0022; C09B67/0014
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
87 words
A process for the preparation of opaque disubstituted quinacridone compounds corresponding to the formulae ##STR3## where R are independently F, Cl, Br, lower alkyl, or lower alkoxy, which consists essentially of milling the crude or subpigmentary form of the quinacridone compound in the presence of an amount 5-25 times the weight of said quinacridone compound of a low boiling alkanol or glycol and 0.5-10.0%, by weight of said alkanol or glycol, of an alkali metal hydroxide or a quaternary ammonium hydroxide, and isolating the resulting opaque compound.
Claim 2
Dependent Claim
87 words
A process for the preparation of opaque disubstituted quinacridone compounds corresponding to the formulae ##STR3## where R are independently F, Cl, Br, lower alkyl, or lower alkoxy, which consists essentially of milling the crude or subpigmentary form of the quinacridone compound in the presence of an amount 5-25 times the weight of said quinacridone compound of a low boiling alkanol or glycol and 0.5-10.0%, by weight of said alkanol or glycol, of an alkali metal hydroxide or a quaternary ammonium hydroxide, and isolating the resulting opaque compound.
Claim 3
Dependent Claim
32 words
The process of claim 1, wherein said quinacridone compound is a 2,9-disubstituted or 4,11-disubstituted quinacridone wherein both substituents are the same and are F, Cl, Br, CH 3 or OCH 3 .
Claim 4
Dependent Claim
10 words
The process of claim 2, wherein said compound is 2,9-dichloroquinacridone.
Claim 5
Dependent Claim
10 words
The process of claim 2, wherein said compound is 2,9-dimethylquinacridone.
Claim 6
Dependent Claim
10 words
The process of claim 2, wherein said compound is 4,11-dichloroquinacridone.
Claim 7
Dependent Claim
22 words
The process of claim 1, wherein said alcohol is selected from the group consisting of methanol, ethanol, butanol, pentanol and ethylene glycol.
Claim 8
Dependent Claim
10 words
The process of claim 6, wherein said alcohol is methanol.
Claim 9
Dependent Claim
14 words
The process of claim 1, wherein said base is potassium hydroxide or sodium hydroxide.
Claim 10
Dependent Claim
19 words
The process of claim 1, wherein said alcohol is methanol and said base is potassium hydroxide or sodium hydroxide.
Claim 11
Dependent Claim
22 words
The process of claim 1, wherein said subpigmentary quinacridone compounds result from the dry premilling or acid pasting of crude quinacridone compounds.
References Cited (Backward Citations)
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Cited
US4541872A
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US4758665A
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US4801702A
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US4760144A
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US4810304A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |