JPS54130620A - Preparation of alpha-quinacridone pigment - Google Patents
Preparation of alpha-quinacridone pigmentInfo
- Publication number
- JPS54130620A JPS54130620A JP3746578A JP3746578A JPS54130620A JP S54130620 A JPS54130620 A JP S54130620A JP 3746578 A JP3746578 A JP 3746578A JP 3746578 A JP3746578 A JP 3746578A JP S54130620 A JPS54130620 A JP S54130620A
- Authority
- JP
- Japan
- Prior art keywords
- water
- quinacridone
- pigment
- dmso
- dimethyl sulfoxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To obtain an α-pigment having improved weatherability, light and heat resistance, simply and rapidly, by dissolving crude quinacridone (Q) in dimethyl sulfoxide in the presence of a caustic alkali and water, and by diluting the solution to purify Q.
CONSTITUTION: One mole of crude quinacridone (Q) of formula is dissolved in dimethyl sulfoxide (DMSO) in the presence of 1.5W2.5 moles of a caustic alkali, preferably a potassium salt, and water in an amount of 6W8 times that of Q at 60W90°C for 1W3 hr. Insoluble matter is filtered off, if necessary, and the resulting solution is diluted with water to give the objective α-quinacridone pigment. The weight ratio of the water to DMSO is preferably 3:97W30:70.
EFFECT: Non-contamination with sulfonates in the absence of sulfuric acid.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3746578A JPS54130620A (en) | 1978-04-01 | 1978-04-01 | Preparation of alpha-quinacridone pigment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3746578A JPS54130620A (en) | 1978-04-01 | 1978-04-01 | Preparation of alpha-quinacridone pigment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54130620A true JPS54130620A (en) | 1979-10-11 |
Family
ID=12498262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3746578A Pending JPS54130620A (en) | 1978-04-01 | 1978-04-01 | Preparation of alpha-quinacridone pigment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54130620A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5286863A (en) * | 1991-08-22 | 1994-02-15 | Ciba-Geigy Corporation | Oxidation process for preparing quinacridone pigments |
| JP2007154212A (en) * | 2007-02-16 | 2007-06-21 | Fujifilm Corp | Organic pigment dispersion and method for producing the same |
| US7404632B2 (en) | 2003-01-31 | 2008-07-29 | Fujifilm Corporation | Ink-jet recording ink and image forming method |
| US7438404B2 (en) | 2003-01-31 | 2008-10-21 | Fujifilm Corporation | Ink-jet recording ink and image-forming method |
-
1978
- 1978-04-01 JP JP3746578A patent/JPS54130620A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5286863A (en) * | 1991-08-22 | 1994-02-15 | Ciba-Geigy Corporation | Oxidation process for preparing quinacridone pigments |
| US7404632B2 (en) | 2003-01-31 | 2008-07-29 | Fujifilm Corporation | Ink-jet recording ink and image forming method |
| US7438404B2 (en) | 2003-01-31 | 2008-10-21 | Fujifilm Corporation | Ink-jet recording ink and image-forming method |
| JP2007154212A (en) * | 2007-02-16 | 2007-06-21 | Fujifilm Corp | Organic pigment dispersion and method for producing the same |
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