Patent US4632704A successfully refreshed from Google Patents.
US4632704A
Expired / Lapsed
US
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Process for the preparation of high yield pigments
Assignee: BASF Corp
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Filing: 1985-02-03
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Granted: 1986-12-30
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Expires: 2005-02-03
Abstract
Abstract A process for the preparation of high yield pigments of the series of the diketopyrrolopyrroles, quinacridones, isoindolinones and isoindolines by protolysis of the pigment salt obtained by treating the crude pigment with a strong base or of the pigment salt obtained in the course of the synthesis, which process comprises treating said pigment salt, in an organic solvent, with water such that the organic solvent is simultaneously removed during the protolysis. The pigments so obtained are high yield pigments and have a particularly fine crystalline form and excellent purity.
Inventors
- 👤 Fridolin Babler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:17
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0014; C09B67/0033; C09B67/0096
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
A process for the preparation of high yield pigments of the series of the diketopyrrolopyrroles, quinacridones, isoindolinones and isoindolines by protolysis of the pigment salt obtained by treating the crude pigment with a strong base or of the pigment salt obtained in the course of the synthesis, which process comprises treating said pigment salt, in an organic solvent, with water such that the organic solvent is simultaneously removed during the protolysis.
Claim 2
Dependent Claim
71 words
A process for the preparation of high yield pigments of the series of the diketopyrrolopyrroles, quinacridones, isoindolinones and isoindolines by protolysis of the pigment salt obtained by treating the crude pigment with a strong base or of the pigment salt obtained in the course of the synthesis, which process comprises treating said pigment salt, in an organic solvent, with water such that the organic solvent is simultaneously removed during the protolysis.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein the pigments employed are diketopyrrolopyrrole pigments.
Claim 4
Dependent Claim
16 words
A process according to claim 1, wherein the pigments employed are quinacridone, isoindolinone or isoindoline pigments.
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein the pigments employed are mixtures of diketopyrrolopyrrole pigments with each other or with quinacridones or other pigments.
Claim 6
Dependent Claim
15 words
A process according to claim 1, wherein the solvent employed is a polar organic solvent.
Claim 7
Dependent Claim
14 words
A process according to claim 1, wherein the polar organic solvent is an alcohol.
Claim 8
Dependent Claim
13 words
A process according to claim 6, wherein tert-amyl alcohol is used as alcohol.
Claim 9
Dependent Claim
21 words
A process according to claim 1, wherein the protolysis is carried out in the temperature range from 15° to 100° C.
Claim 10
Dependent Claim
16 words
A process according to claim 1, wherein the solvent is removed by distillation during the protolysis.
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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) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |