GB312330A - - Google Patents

Abstract

312,330. Geigy Akt.-Ges., J. R. May 24, 1928, [Convention date]. Monoazo dyes; phthalein dyes. - Monoazo phthalein dyes are obtained bv condensing arylazoresorcinols with N-alkylated or N-arylated aminooxybenzoylbenzoic acids or aminooxybenzoylpropionic acids in equimolecular proportions. The products are mordant dyestuffs, those obtained from diazotized o-oxyamines yielding mainly blue to greenish-blue dyeings when aftertreated on the fibre with metal salts; the presence of additiona.l mordant-dyeing groups, such as carboxyl or o-oxycarboxyl groups in the arylazoresorcinol results in dyeings which are red to brown-red on after-chroming. The following examples are specified. (1) A mixture of the monoazo dyestuff 6-methyl-2-aminophenol-4-sulphonic acid # resorcinol with dimethylaminooxybenzoylbenzoic acid is heated with concentra,ted sulphuric acid for 20 hrs. at 70‹ C., and the dyestuff is precipitated by pouring into water; it dyes wool from an acid bath a reddishblue which is rendered a fast blue by aftertreatment; a similar product is obtained when 4-chloro-2-aminophenol-6-sulphonic acid is used as first component. (2) A mixture of the monoazo dyestuff 1:2: 4-aminonaphtholsulphonic acid # resorcinol and diethylaminooxybenzoylbenzoic acid is heated with concentrated sulphuric acid for 4-5 hrs. at 70‹ C., and the product is separated as in (1); it dyes wool from an acid bath a pure greenish-blue which is rendered duller but faster by after-chroming or after-coppering; the corresponding dyestuff obtained when nitro -1:2:4- aminonaphtholsulphonic acid is used as first component yields green dyeings when after-chromed on wool. (3) A mixture of the monoazo dyestuff anthranilic acid # resorcinol and dimethylaminooxy. benzoylbenzoic acid is heated with concentrated sulphuric acid for 24 hrs. at 70‹ C., and the product is separated as in (1); it yields brownred dyeings when after-chromed on wool. The use as first components of aniline and its sulphonic acids, e.g. sulphanilic acid, chloranilinesulphonic acid, naphthylamines or their sulphonic acids, e.g. 1 :5- or 2 : 6-naphthylaminesulphonic acids gives rise to brown to red dyestuffs, valuable mainly as intermediates. Specifications 12181/97 and 10523/11 are referred to. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the use of derivatives of resorcinol as coupling components. This subject-matter does not appear in the Specification as accepted.