JPS54130621A - Preparation of beta-quinacridone pigment - Google Patents
Preparation of beta-quinacridone pigmentInfo
- Publication number
- JPS54130621A JPS54130621A JP3746678A JP3746678A JPS54130621A JP S54130621 A JPS54130621 A JP S54130621A JP 3746678 A JP3746678 A JP 3746678A JP 3746678 A JP3746678 A JP 3746678A JP S54130621 A JPS54130621 A JP S54130621A
- Authority
- JP
- Japan
- Prior art keywords
- water
- quinacridone
- 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.)
- Granted
Links
Landscapes
- Nitrogen Condensed Heterocyclic Rings (AREA)
Abstract
PURPOSE: To obrain β-quinacridone pigment having improved weatherability, light and heat resistance simply in a short time, by dissolving crude quinacridone in dimethyl sulfoxide in the presence of a caustic alkali and water, and by diluting the solution with a lower alcohol.
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 a 1W3C lower alcohol to give the desired β-quinacridone pigment. The weight ratio of the water to DMSO is preferably 3:97W30:70.
EFFECT: Fine pulverizing step is unnecessary, and the product is not contaminated with sulfonates in the absence of sulfuric acid.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3746678A JPS54130621A (en) | 1978-04-01 | 1978-04-01 | Preparation of beta-quinacridone pigment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3746678A JPS54130621A (en) | 1978-04-01 | 1978-04-01 | Preparation of beta-quinacridone pigment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54130621A true JPS54130621A (en) | 1979-10-11 |
JPS557474B2 JPS557474B2 (en) | 1980-02-26 |
Family
ID=12498290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3746678A Granted JPS54130621A (en) | 1978-04-01 | 1978-04-01 | Preparation of beta-quinacridone pigment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54130621A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0201347A2 (en) * | 1985-05-10 | 1986-11-12 | Tosoh Corporation | Process for preparation of organic pigments |
US5223624A (en) * | 1991-08-22 | 1993-06-29 | Baebler Fridolin | Modified gamma-quinacridone pigment |
US5286863A (en) * | 1991-08-22 | 1994-02-15 | Ciba-Geigy Corporation | Oxidation process for preparing quinacridone pigments |
-
1978
- 1978-04-01 JP JP3746678A patent/JPS54130621A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0201347A2 (en) * | 1985-05-10 | 1986-11-12 | Tosoh Corporation | Process for preparation of organic pigments |
US5223624A (en) * | 1991-08-22 | 1993-06-29 | Baebler Fridolin | Modified gamma-quinacridone pigment |
US5286863A (en) * | 1991-08-22 | 1994-02-15 | Ciba-Geigy Corporation | Oxidation process for preparing quinacridone pigments |
Also Published As
Publication number | Publication date |
---|---|
JPS557474B2 (en) | 1980-02-26 |
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