Patent US4094699A successfully refreshed from Google Patents.
US4094699A
Expired / Lapsed
US
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Process for converting premilled quinacridone to pigmentary form
Assignee: Novartis Corp
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Filing: 1976-12-01
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Granted: 1978-06-13
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Expires: 1996-12-01
Abstract
Abstract Process for converting premilled quinacridone to pigmentary form by contacting the premilled quinacridone with an aqueous alkaline medium in the presence of at least one surfactant. The process eliminates the need for salt in the premilling operation and eliminates the use of organic liquids in the premilling or aftertreatment of the premilled quinacridone.
Inventors
- 👤 Patrick Henry Fitzgerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:09
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0014
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
A process for converting premilled quinacridone to pigmentary form by contacting the premilled quinacridone with an aqueous alkaline medium consisting essentially of water having a pH of at least 10 in an amount sufficient to intimately contact the premilled quinacridone at a temperature of at least 85° C. in the presence of at least one surfactant selected form cationic and nonionic surfactants, wherein the cationic surfactant is in an amount from 2 to 9% by weight, based on the weight of the premilled quinacridone and the nonionic surfactant is in an amount from 2 to 8% by weight, based on the weight of the premilled quinacridone.
Claim 2
Dependent Claim
106 words
A process for converting premilled quinacridone to pigmentary form by contacting the premilled quinacridone with an aqueous alkaline medium consisting essentially of water having a pH of at least 10 in an amount sufficient to intimately contact the premilled quinacridone at a temperature of at least 85° C. in the presence of at least one surfactant selected form cationic and nonionic surfactants, wherein the cationic surfactant is in an amount from 2 to 9% by weight, based on the weight of the premilled quinacridone and the nonionic surfactant is in an amount from 2 to 8% by weight, based on the weight of the premilled quinacridone.
Claim 3
Dependent Claim
32 words
A process for converting premilled quinacridone to pigmentary form according to claim 1 wherein the cationic surfactant is selected from trimethyl alkyl amine salts and the nonionic surfactant is selected from alkylphenylpolyethoxyethanols.
Claim 4
Dependent Claim
27 words
A process for converting premilled quinacridone to pigmentary form according to claim 2 wherein the premilled quinacridone is contacted with the aqueous alkaline medium at ambient pressure.
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) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |