GB951451A - Process for the manufacture of linear quinacridone in the ª‰-crystal phase - Google Patents
Process for the manufacture of linear quinacridone in the ª‰-crystal phaseInfo
- Publication number
- GB951451A GB951451A GB1729860A GB1729860A GB951451A GB 951451 A GB951451 A GB 951451A GB 1729860 A GB1729860 A GB 1729860A GB 1729860 A GB1729860 A GB 1729860A GB 951451 A GB951451 A GB 951451A
- Authority
- GB
- United Kingdom
- Prior art keywords
- range
- temperature
- quinacridone
- ethylene glycol
- diethylene glycol
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B48/00—Quinacridones
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Linear quinacridone in the beta-phase is made by heating a wet crude linear quinacridone, obtained by condensing 2 : 5-dianilinoterephthalic acid with polyphosphoric acid, under superatmospheric pressure at a temperature in the range of about 120 DEG C. to about 200 DEG C. with an aqueous solution of an inorganic base or mixture of inorganic bases, (a) in the presence of an organic diluent which is inert to alkali, or (b) in the absence of an organic diluent, in which case, after filtering and washing the quinacridone until neutral, the wet press cake is, if desired, heated with an organic diluent under superatmospheric pressure at a temperature within the range of about 120 DEG C. to about 180 DEG C. or under atmospheric pressure at a temperature within the range of about 100 DEG C. to about 180 DEG C. Organic diluents mentioned for (a) are ethanol, propanol, butanol, ethylene glycol, diethylene glycol, the mono-methyl, ethyl and butyl ethers of ethylene glycol and diethylene glycol monoethyl ether and mixtures thereof, and for (b) dimethylformamide, N-methyl-acetamide, diethylene glycol monoethyl ether, ethylene glycol, propanol, butanol, hexanol, triethanolamine, quinoline, dimethyl aniline, nitrobenzene, dichlorobenzene, malonic ester, phenol and diphenyl diphenyloxide. Inorganic bases which may be used are the hydroxides and carbonates of sodium and potassium and ammonium hydroxide and mixtures thereof. Examples are given. Specifications 828,052 and 868,360 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF0002844 | 1959-05-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB951451A true GB951451A (en) | 1964-03-04 |
Family
ID=7083516
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1729860A Expired GB951451A (en) | 1959-05-15 | 1960-05-16 | Process for the manufacture of linear quinacridone in the ª‰-crystal phase |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB951451A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5591258A (en) * | 1993-11-25 | 1997-01-07 | Hoechst Aktiengesellschaft | Preparation of linear, unsubstituted quinacridone pigments of the β-phase |
US5662739A (en) * | 1994-01-07 | 1997-09-02 | Hoechst Aktiengesellschaft | Use of fatty acid taurides for the dispersion of polycyclic pigments |
US5755872A (en) * | 1996-04-02 | 1998-05-26 | Hoechst Aktiengesellschaft | Process for preparing quinacridone pigments |
-
1960
- 1960-05-16 GB GB1729860A patent/GB951451A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5591258A (en) * | 1993-11-25 | 1997-01-07 | Hoechst Aktiengesellschaft | Preparation of linear, unsubstituted quinacridone pigments of the β-phase |
US5662739A (en) * | 1994-01-07 | 1997-09-02 | Hoechst Aktiengesellschaft | Use of fatty acid taurides for the dispersion of polycyclic pigments |
US5755872A (en) * | 1996-04-02 | 1998-05-26 | Hoechst Aktiengesellschaft | Process for preparing quinacridone pigments |
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