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    • 5. 发明授权
    • Acid dyestuffs of the anthraquinone series
    • US1902084A
    • 1933-03-21
    • US52070631
    • 1931-03-06
    • GEN ANILINE WORKS INC
    • GEORG KRAENZLEINERNST DIEFENBACH
    • C09B1/26C09B1/34C09B1/54
    • C09B1/26C09B1/16C09B1/22C09B1/34C09B1/343C09B1/545
    • Anthraquinone dyes are obtained by esterifying dyes similar to those of the parent Specification but containing the carboxylic group in the 5-, 6-, or 7-position of the anthraquinone nucleus. The products are 1-amino-4-sulphonarylido-2-halogen or 1-amino-4-alkyl or arylamino-2-sulpho-5-, 6-, or 7-, carbalkoxyanthraquinones. The esters are obtained by the customary methods from the free carboxylic acids. The 2 : 4-dihalogen-1-amino-anthraquinones containing a carboxyl group in the 5-, 6-, or 7- position are obtained by halogenating the corresponding aminocarboxylic acids according to the process of German Specification 142,997. These products on condensation with an aliphatic or aromatic amine, and subsequent sulphonation, or condensation with a sulphonated aromatic amine, yield the parent materials for esterification. According to examples, the following compounds are esterified with ethyl alcohol by customary methods:--1-aminoanthraquinone - 2 - bromo-6-carboxy -4-anilidosulphonic acid, 1-amino-anthraquinone-4-anilido-6-carboxy-2-sulphonic acid, and 1-amino-2-bromo-4-methylaminoanthraquinone-6-carboxylic acid, which is sulphonated after esterification. Compounds having in the 4-position, ethylamino, propylamino, butylamino, tolylamino, xylylamino, cyclohexylamino, naphthylamino, and tetrahydronaphthylamino residues are also specified. Specifications 10378/14 and 7861/15, [both in Class 2 (iii), Dyes &c.], are referred to.