JPS54130621A - Preparation of beta-quinacridone pigment - Google Patents

Preparation of beta-quinacridone pigment

Info

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
Application number
JP3746678A
Other languages
Japanese (ja)
Other versions
JPS557474B2 (en
Inventor
Katsuya Shibata
Motohiro Hamada
Eiji Iwamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tosoh Corp
Original Assignee
Toyo Soda Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyo Soda Manufacturing Co Ltd filed Critical Toyo Soda Manufacturing Co Ltd
Priority to JP3746678A priority Critical patent/JPS54130621A/en
Publication of JPS54130621A publication Critical patent/JPS54130621A/en
Publication of JPS557474B2 publication Critical patent/JPS557474B2/ja
Granted legal-status Critical Current

Links

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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
JP3746678A 1978-04-01 1978-04-01 Preparation of beta-quinacridone pigment Granted JPS54130621A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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