US4760144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of yellow shade modification of gamma quinacridone
Assignee: BASF Corp
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Filing: 1986-11-13
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Granted: 1988-07-26
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Expires: 2006-11-13
Abstract
Abstract Process for preparing yellow shade modification of gamma quinacridone whereby the gamma II form is converted to the gamma I form (1) by milling in an alcohol and in the presence of a base or (2) by premilling the gamma II form to the gamma I form and then refluxing or milling the resulting gamma I form in an alcohol in the presence of a base, the resulting product being a highly crystalline, bright, yellow shade, ready dispersable gamma I quinacridone pigment.
Inventors
- 👤 Edward E. Jaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:11
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04; C09; C09B; C09B67/00; C09B67/0001; C09B67/0014; C09B67/0025; C09B67/0027
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
68 words
A process for converting crude gamma-phase II quinacridone to gamma-phase I quinacridone having an average particle size in excess of 0.1 μm and a surface area less than 30 square meters per gram which comprises milling the crude quinacridone in the presence of a converting system consisting essentially of effective converting amounts of a lower alcohol or glycol and a base and isolating the yellow-shade gamma-phase I quinacridone.
Claim 2
Dependent Claim
68 words
A process for converting crude gamma-phase II quinacridone to gamma-phase I quinacridone having an average particle size in excess of 0.1 μm and a surface area less than 30 square meters per gram which comprises milling the crude quinacridone in the presence of a converting system consisting essentially of effective converting amounts of a lower alcohol or glycol and a base and isolating the yellow-shade gamma-phase I quinacridone.
Claim 3
Dependent Claim
24 words
The process of claim 1, wherein said alcohol or glycol is selected from the group consisting or methanol, ethanol, butanol, pentanol and ethylene glycol.
Claim 4
Dependent Claim
10 words
The process of claim 2, wherein said alcohol is methanol.
Claim 5
Dependent Claim
13 words
The process of claim 1, wherein said base is an alkali metal hydroxide.
Claim 6
Dependent Claim
11 words
The process of claim 4, wherein said base is potassium hydroxide.
Claim 7
Dependent Claim
16 words
The process of claim 1, wherein said alcohol is methanol and said base is potassium hydroxide.
Claim 8
Dependent Claim
42 words
The process of claim 1, wherein said alcohol is present in an amount ranging from 6.6 to 18 times the weight of said quinacridone, and said base is present in an amount ranging from 1.0 to 10.0% by weight of said alcohol.
Claim 9
Dependent Claim
81 words
A process for converting crude gamma-phase II quinacridone to gamma-phase I quinacridone having an average particle size in excess of 0.1 μm and a surface area less than 30 square meters per gram which comprises the steps of dry premilling the crude quinacridone for conversion to the gamma I form, contacting said premilled quinacridone with a system consisting essentially of a lower alcohol or glycol and a base, refluxing the resulting quinacridone dispersion and isolating the yellow shade gamma-phase I quinacridone.
Claim 10
Dependent Claim
81 words
A process for converting crude gamma-phase II quinacridone to gamma-phase I quinacridone having an average particle size in excess of 0.1 μm and a surface area less than 30 square meters per gram which comprises the steps of dry premilling the crude quinacridone for conversion to the gamma I form, contacting said premilled quinacridone with a system consisting essentially of a lower alcohol or glycol and a base, refluxing the resulting quinacridone dispersion and isolating the yellow shade gamma-phase I quinacridone.
Claim 11
Dependent Claim
16 words
The process of claim 8, wherein said alcohol is methanol and said base in potassium hydroxide.
Claim 12
Dependent Claim
85 words
A process for converting crude gamma-phase II quinacridone to gamma-phase I quinacridone having an average particle size in excess of 0.1 μm and a surface area less than 30 square meters per gram which comprises the steps of dry premilling the crude quinacridone for conversion to the gamma I form, milling the premilled quinacridone in the presence of a system consisting essentially of effective particle growth promoting amounts of a lower alcohol or glycol and a base and isolating the yellow shade gamma-phase I quinacridone.
Claim 13
Dependent Claim
85 words
A process for converting crude gamma-phase II quinacridone to gamma-phase I quinacridone having an average particle size in excess of 0.1 μm and a surface area less than 30 square meters per gram which comprises the steps of dry premilling the crude quinacridone for conversion to the gamma I form, milling the premilled quinacridone in the presence of a system consisting essentially of effective particle growth promoting amounts of a lower alcohol or glycol and a base and isolating the yellow shade gamma-phase I quinacridone.
Claim 14
Dependent Claim
24 words
The process of claim 10, wherein said alcohol or glycol is selected from the group consisting of methanol, ethanol, butanol, pentanol and ethylene glycol.
Claim 15
Dependent Claim
10 words
The process of claim 11, wherein said alcohol is methanol.
Claim 16
Dependent Claim
13 words
The process of claim 10, wherein said base is an alkali metal hydroxide.
Claim 17
Dependent Claim
11 words
The process of claim 13, wherein said base is potassium hydroxide.
Claim 18
Dependent Claim
16 words
The process of claim 10, wherein said alcohol is methanol and said base is potassium hydroxide.
Claim 19
Dependent Claim
43 words
The process of claim 10, wherein said alcohol is present in an amount ranging from 6.6 to 18 times the weight of said crude quinacridone, and said base is present in an amount ranging from 1.0 to 10.0%, by weight of said alcohol.
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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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |