- Disperse red 60 condensation process
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The invention relates to the technical field of dyes, in particular to a disperse red 60 condensation process. The process comprises the following steps: in a condensation kettle, firstly adding phenol and a 1-amino-2-bromo-4-hydroxyanthraquinone dry product, then adding sodium carbonate and a catalyst, heating to 140-160 DEG C, carrying out reactions at a constant temperature; after the reactionis finished, cooling to 90-100 DEG C, adding water within the temperature range, dropwise adding liquid caustic soda, cooling to 50-55 DEG C after dropwise adding is finished, filtering, cleaning, anddrying to obtain 1-amino-2-phenoxy-4-hydroxyanthraquinone, namely disperse red 60. According to the process, a condensed acid-binding agent (potassium carbonate) is directly substituted by sodium carbonate with a lower price, and a certain amount of a proper phase transfer catalyst is added, so that the contact probability and activity of condensation reactions are improved, the aims of improvingthe product quality and yield and reducing the production cost are fulfilled, and the cost of the disperse red 60 can be reduced by 1500 yuan/ton.
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Paragraph 0016-0019
(2020/06/04)
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- Preparation and purification of 1-amino-2-phenoxy-4-hydroxyanthraquinone
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Pure 1-amino-2-phenoxy-4-hydroxyanthraquinone is prepared by reacting 1-amino-2-halo-4-hydroxyanthraquinone with phenol in aqueous suspension at pH 9-13 and 130°-160° C., adjusting the reaction mixture pH to 9.5-11.5 after the reaction has ended, separating the reaction product from the liquid phase, and ,washing it with alkaline hypochlorite solution.
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- Order Parameters of β-Substituted Anthraquinone Dyes I: 1-Amino-4-Hydroxyanthraquinone Derivatives
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A study is presented of the optical order parameters and spectroscopic properties of 1-amino-4-hydroxyanthraquinone derivatives containing various substituents in the 2-position in a nematic liquid crystalline mixture composed of cyanophenylcyclohexane derivatives.The results are discussed in terms of the effects of the dye structure on the order parameters.By introducing a -SCH2- group into the 2-position, magneta dyes have been obtained which show high order parameters and solubilities.In addition, preliminary data on the solubility and photostability of the dyes are reported.
- Imazeki, Shuji,Ono, Hitoshi,Kaneko, Masaharu,Mukoh, Akio
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p. 249 - 262
(2007/10/02)
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- Colorants Anthraquinoniques Stables de Parametre D'Ordre Eleve en Solution Dans les Cristaux Liquides
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Anthraquinone dyes have been shown to be usable as "Guest" Dyes in dichroic Guest-Host displays.Whereas 1-5-N-alkyl substitution produces solutions of negative order parameter, 1- and 1-5-alkylanilino substitution give blue and violet dyes of acceptable order parameter, although admittedly too low for most industrial applications.Substitution of an anthraquinone in the 2- or 2,6-positions results in stable dyes of high order parameter in liquid crystal mixtures of positive dielectric anisotropy.The colour of the dye depends on the substituents present in the 1-, 4-, 5-, 8-positions as indicated in Table II.Substitution by an alkoxy, alkylthio or phenoxy group gives dyes of acceptable order parameter.The order parameter is greatly increased if the 2 substituting group is an alkoxyphenyl group.The highest order parameter is obtained through simultaneous p-alkoxyphenyl 2,6-substitution.These compounds give order parameters comparable with azo dyes with increased stability, provided that a mobile hydrogen is present on the 1- and/or 5-position.The presence of the dye in a L.C. mixture increases its photochemical stability.Solubility is of the order of 7percent, which allows fabrication of displays of high contrast.The order parameter increases with the alkoxy chain length and with the Host nematic transition temperature, except for mixtures containing esters.This shows the importance of dye-L.C. interactions.
- Cognard, J.,Phan, T. Hieu
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