- A heat-sensitive printing fluoran dye preparation method (by machine translation)
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The present invention relates to the field of heat-sensitive dye, in particular to a heat-sensitive printing fluoran dye preparation method. In order to fluorescein as the starting material, substitution, condensation, condensation to obtain the final product, 3 '- [octyl (2 - ethyl-phenyl) amino] - 6' - (2 - methyl phenyl) amino - spiro [isobenzofuran - 1 (3 H), 9' - [9 H] aroyl - 3 - one. Wherein fluorescein is fluorescein isothiocyanate, rhodamine or four for four ethyl base different thiocyanate rhodamine. The method of the invention simple and convenient operation, high conversion rate, low cost, easy to realize large-scale industrial production. This invention obtains the fluoran dye color rendering ability is strong, the Image reduction lifelike, clear, fast. The dye is applied to the non-ink printing new technologies, the technology through the dispersion coating, will include including C yellow, product, green three dye coating on paper, photographic paper is carried out by heating to obtain a high-quality Image. Because does not need to built-in cartridge, thereby producing very small size printer, can even built-in digital camera or camera in the mobile phone. (by machine translation)
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Paragraph 0028; 0029; 0030; 0031; 0032; 0048
(2017/08/29)
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- Ferric hydrogensulphate as a recyclable catalyst for the synthesis of fluorescein derivatives
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Polycondensation reactions of phenols with phthalic anhydride were carried out in the presence of ferric hydrogensulphate under melt conditions. The reactions proceeded in short reaction times by using a catalytic amount of Fe(HSO4)3 and the corresponding fluorescein derivatives were obtained in high yields. The simplicity, scale-up, along with the use of an inexpensive, non-toxic, recyclable catalyst of an environmentally benign nature, are other remarkable features of the procedure. The absorption and emission properties of these fluorescein derivatives were studied.
- Eshghi, Hossein,Mirzaie, Narges
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experimental part
p. 504 - 509
(2012/07/13)
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- Colorant compounds
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Compounds of the formula wherein M is either (1) a metal ion having a positive charge of +y wherein y is an integer which is at least 2, said metal ion being capable of forming a compound with at least two chromogen moieties, or (2) a metal-containing moiety capable of forming a compound with at least two chromogen moieties, z is an integer representing the number of chromogen moieties associated with the metal and is at least 2, R1, R2, R3, R4, R5, R6, R7, a, b, c, d, Y, and z are as defined herein, Q? is a COO? group or a SO3— group, A is an organic anion, and CA is either a hydrogen atom or a cation associated with all but one of the Q? groups.
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Page/Page column 44
(2008/06/13)
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- Triphenylmethane colorant compounds
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Compounds of the formulae and wherein R1, R2, R3, R4, R5, R6, R7, a, b, c, d, Y, Q, Q-, A, and CA are as defined herein.
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