METHOD OF OBTAINING THIOINDIGOID DYES Russian patent published in 2015 - IPC C09B7/10 C09B7/12 

FIELD: chemistry.

SUBSTANCE: invention relates to technology of obtaining thioindigoid dyes, widely applied for colouration of textile and polymer materials. Essence of invention consists in the fact that as catalyst of oxidation of non-substituted or substituted benzo[b]thiophenone-3 or naphtho[2,3-b]thiophenone-3 with air oxygen in water-alkali medium used is dichlorodisulphonic acid of cobalt phthalocyanine or its salt of formula [CoPC]Cl₂(SO₃)₂ ^2-2Cat⁺, where Cat⁺ = H⁺, Na⁺, K⁺, NH₄ ⁺, [HN(CH₂CH₂OH)₃]⁺. The process is carried out in presence of sodium salt of dialkyl ether of sulphosuccinic acid, where alkyl R = C₄H₉, C₈H₁₇, C₉H₁₉.

EFFECT: claimed method is universal, low-waste and highly-productive for obtaining thioindigoid dyes and pigments.

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