CH469060A - Process for the preparation of water-soluble, cationic monoazo dyes and the use thereof - Google Patents

Process for the preparation of water-soluble, cationic monoazo dyes and the use thereof

Info

Publication number
CH469060A
CH469060A CH1131366A CH1131366A CH469060A CH 469060 A CH469060 A CH 469060A CH 1131366 A CH1131366 A CH 1131366A CH 1131366 A CH1131366 A CH 1131366A CH 469060 A CH469060 A CH 469060A
Authority
CH
Switzerland
Prior art keywords
soluble
preparation
water
monoazo dyes
cationic monoazo
Prior art date
Application number
CH1131366A
Other languages
German (de)
Inventor
Hans Dr Grossmann
Heinz Dr Keller
Original Assignee
Durand & Huguenin Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Durand & Huguenin Ag filed Critical Durand & Huguenin Ag
Priority to CH1131366A priority Critical patent/CH469060A/en
Priority to FR116876A priority patent/FR1533643A/en
Priority to DE19671644138 priority patent/DE1644138A1/en
Priority to GB3584867A priority patent/GB1195386A/en
Publication of CH469060A publication Critical patent/CH469060A/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00Cosmetics or similar toiletry preparations
    • A61K8/18Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/40Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/41Amines
    • A61K8/416Quaternary ammonium compounds
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00Cosmetics or similar toiletry preparations
    • A61K8/18Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/46Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur
    • A61K8/466Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur containing sulfonic acid derivatives; Salts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00Cosmetics or similar toiletry preparations
    • A61K8/18Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/49Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00Cosmetics or similar toiletry preparations
    • A61K8/18Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/49Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
    • A61K8/494Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with more than one nitrogen as the only hetero atom
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61QSPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q5/00Preparations for care of the hair
    • A61Q5/06Preparations for styling the hair, e.g. by temporary shaping or colouring
    • A61Q5/065Preparations for temporary colouring the hair, e.g. direct dyes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09BORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B44/00Azo dyes containing onium groups
    • C09B44/02Azo dyes containing onium groups containing ammonium groups not directly attached to an azo group
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09BORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B44/00Azo dyes containing onium groups
    • C09B44/02Azo dyes containing onium groups containing ammonium groups not directly attached to an azo group
    • C09B44/06Azo dyes containing onium groups containing ammonium groups not directly attached to an azo group from coupling components containing hydroxyl as the only directing group

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Birds (AREA)
  • Epidemiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Cosmetics (AREA)
  • Coloring (AREA)
CH1131366A 1966-08-05 1966-08-05 Process for the preparation of water-soluble, cationic monoazo dyes and the use thereof CH469060A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CH1131366A CH469060A (en) 1966-08-05 1966-08-05 Process for the preparation of water-soluble, cationic monoazo dyes and the use thereof
FR116876A FR1533643A (en) 1966-08-05 1967-08-04 Monoazo, cationic, water-soluble dyes, their preparation process and applications
DE19671644138 DE1644138A1 (en) 1966-08-05 1967-08-04 Water-soluble, cationic monoazo dyes, process for their preparation and their use
GB3584867A GB1195386A (en) 1966-08-05 1967-08-04 Water-Soluble Cationic Monoazo-Dyestuffs and their manufacture and use

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1131366A CH469060A (en) 1966-08-05 1966-08-05 Process for the preparation of water-soluble, cationic monoazo dyes and the use thereof

Publications (1)

Publication Number Publication Date
CH469060A true CH469060A (en) 1969-02-28

Family

ID=4372269

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1131366A CH469060A (en) 1966-08-05 1966-08-05 Process for the preparation of water-soluble, cationic monoazo dyes and the use thereof

Country Status (3)

Country Link
CH (1) CH469060A (en)
DE (1) DE1644138A1 (en)
GB (1) GB1195386A (en)

Families Citing this family (72)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3114075A1 (en) * 1981-04-08 1982-11-04 Bayer Ag, 5090 Leverkusen CATIONIC AZO DYES, THEIR PRODUCTION AND USE
FR2788433B1 (en) * 1999-01-19 2003-04-04 Oreal USE OF CATIONIC PHENYL-AZO-BENZENIC COMPOUNDS FOR DYEING KERATINIC FIBERS, TINCTORIAL COMPOSITIONS AND DYEING METHODS
US7201779B2 (en) 2003-06-16 2007-04-10 L'oreal S.A. Dye composition comprising at least one direct dye containing mixed chromophores
US7172633B2 (en) 2003-06-16 2007-02-06 L'ORéAL S.A. Lightening dye composition comprising at least one cationic direct dye containing mixed chromophores
US7300471B2 (en) 2004-02-27 2007-11-27 L'oreal S.A. Composition comprising at least one mixed dye based on at least one chromophore of azo or tri(hetero) arylmethane type, dyeing process and mixed dyes.
US7235645B2 (en) 2004-07-23 2007-06-26 L'oreal, S.A. Cationic azo monomers or symmetric dimers, preparation thereof, compositions comprising same and process for dyeing keratin fibers
US7488354B2 (en) 2004-10-14 2009-02-10 L'oreal S.A. Dyeing composition comprising at least one disulphide dye and method of dyeing human keratin fibers using this dye
WO2007110537A2 (en) 2006-03-24 2007-10-04 L'oréal Dyeing composition containing a thiol/disulphide fluorescent colorant comprising amine groups and having an internal cationic charge, and method for lightening keratin materials using said colorant
FR2898903B1 (en) 2006-03-24 2012-08-31 Oreal DYEING COMPOSITION COMPRISING A FLUORESCENT DISULFIDE DYE, METHOD OF LIGHTENING KERATINIC MATERIALS FROM THAT COLORANT
FR2919179B1 (en) 2007-07-24 2010-02-19 Oreal CAPILLARY COMPOSITION COMPRISING AT LEAST ONE DIRECT DISULFIDE DYE AND AT LEAST ONE ALKALINE HYDROXIDE AGENT AND METHOD FOR SIMULTANEOUS SHAPING AND COLORING.
FR2921256B1 (en) 2007-09-24 2009-12-04 Oreal COMPOSITION FOR COLORING KERATINIC FIBERS COMPRISING AT LEAST ONE DIRECT DYE WITH DISULFURE / THIOL FUNCTION AND AT LEAST ONE THIOL-FUNCTIONAL POLYMER AND PROCESS USING THE COMPOSITION
FR2968954B1 (en) 2010-12-15 2012-12-21 Oreal PROCESS FOR COLORING KERATIN FIBERS USING A DIRECT DYE WITH PROTECTED DISULFIDE / THIOL / THIOL FUNCTION AND WATER VAPOR
FR2971936B1 (en) 2011-02-25 2013-02-15 Oreal COMPOSITION FOR COLORING KERATIN FIBERS COMPRISING DIRECT DYE WITH DISULFIDE / THIOL FUNCTION, NON-IONIC SURFACTANT, AMPHOTERIC SURFACTANT, ETHOXYL FATTY ALCOHOL, ALKALINE AGENT, AND REDUCING AGENT
FR2971935B1 (en) 2011-02-25 2013-02-15 Oreal COMPOSITION FOR COLORING KERATIN FIBERS COMPRISING DIRECT COLOR WITH DISULFIDE / THIOL FUNCTION, THICKENING POLYMER, NON-IONIC SURFACTANT, ALKALINE AGENT, AND REDUCING AGENT
FR2971938B1 (en) 2011-02-25 2013-08-02 Oreal COMPOSITION FOR COLORING KERATINIC FIBERS COMPRISING DIRECT COLOR WITH DISULFURE / THIOL FUNCTION, LOW OR NON-ETHOXYL FATTY ALCOHOL, CATIONIC SURFACTANT, ALKALINE AGENT, AND REDUCING AGENT
FR2971937B1 (en) 2011-02-25 2013-02-15 Oreal COMPOSITION FOR COLORING KERATIN FIBERS COMPRISING A DIRECT DYE WITH DISULFURE / THIOL FUNCTION, A NON-CELLULOSIC THICKENING POLYMER, AN ALKALI AGENT, AND A REDUCING AGENT
WO2012113720A2 (en) 2011-02-25 2012-08-30 L'oreal Composition for dyeing keratinous fibres comprising a direct dye having a disulphide/thiol functional group, a thickening polymer, an ethoxylated fatty alcohol and/or a nonionic surfactant, an alkaline agent and a reducing agent
FR2971939B1 (en) 2011-02-25 2013-02-15 Oreal COMPOSITION FOR COLORING KERATINIC FIBERS COMPRISING A DIRECT DYE WITH DISULFIDE / THIOL FUNCTION, A FATTY BODY, AN ALKALI AGENT, AND A REDUCING AGENT
US9066890B2 (en) 2011-07-05 2015-06-30 L'oreal Dye composition comprising an alkoxylated fatty alcohol ether and a fatty alcohol
FR2977482B1 (en) 2011-07-05 2013-11-08 Oreal COLORING COMPOSITION USING A LONG CHAIN ETHER OF ALCOXYL FATTY ALCOHOL AND CATIONIC POLYMER, METHODS AND DEVICES
CN103619321A (en) 2011-07-05 2014-03-05 莱雅公司 Cosmetic composition rich in fatty substances comprising a polyoxyalkylenated fatty alcohol ether and a direct dye and/or an oxidation dye, the dyeing method and the device
FR2980675B1 (en) 2011-09-30 2013-11-01 Oreal METHOD FOR COLOR TEMPORARY SHAPING OF KERATIN FIBERS
US10226411B2 (en) 2012-08-02 2019-03-12 L'oreal Dyeing composition comprising a fatty substance, a non-ionic guar gum, an amphoteric surfactant and a non-ionic or anionic surfactant, and an oxidizing agent, dyeing process and suitable device
US9827185B2 (en) 2012-08-02 2017-11-28 L'oreal Dyeing composition comprising at least one fatty substance, at least one oxidizing agent and at least one non-ionic, anionic and amphoteric surfactant
FR2994084B1 (en) 2012-08-02 2014-10-31 Oreal CREAM-STAINING COMPOSITION COMPRISING AT LEAST ONE OIL, NO LITTLE OR LESS SOLID FATTY ALCOHOL, COLORING PROCESS AND APPROPRIATE DEVICE
FR2994091B1 (en) 2012-08-02 2014-08-01 Oreal COLORING COMPOSITION COMPRISING NON-IONIC GUAR GUM OR ONE OF ITS NON-IONIC DERIVATIVES, PROCESS AND DEVICE
FR3043551B1 (en) 2015-11-12 2017-11-24 Oreal DIRECT CATIONIC COLOR WITH ALIPHATIC CHAIN AND FUNCTION DISULFURE / THIOL / THIOL PROTECTED TO COLOR KERATIN FIBERS
FR3060990B1 (en) 2016-12-22 2019-11-01 L'oreal METHOD FOR COLORING AND RELAXING KERATIN FIBER BUCKLES USING REDUCING AGENTS AND CAPILLARY DYES, AND KIT THEREOF
FR3067599B1 (en) 2017-06-16 2020-09-04 Oreal PROCESS FOR COLORING KERATINIC MATERIALS USING AT LEAST ONE BLUE, PURPLE OR GREEN COLOR AND AT LEAST ONE FLUORESCENT COLORANT DISULPHIDE, THIOL OR PROTECTED THIOL
FR3067597B1 (en) 2017-06-16 2020-09-04 Oreal PROCESS FOR COLORING KERATINIC FIBERS USING AT LEAST ONE DIRECT DYE AND AT LEAST ONE FLUORESCENT DYE DISULPHIDE, THIOL OR PROTECTED THIOL
FR3083100B1 (en) 2018-06-27 2021-01-15 Oreal COLORING COMPOSITION CONSISTING OF A DIRECT DYE, A PEROXYGEN SALT AND A CYCLODEXTRIN, AND PROCESS USING THIS COMPOSITION
FR3083106B1 (en) 2018-06-29 2020-10-02 Oreal PROCESS FOR COLORING KERATINIC FIBERS USING A MONOSACCHARIDE, A POLYSACCHARIDE WITH AMINO GROUPS AND A COLORING MATTER
FR3090349B1 (en) 2018-12-21 2020-12-18 Oreal Process for dyeing keratin materials using a direct dye and a saturated heterocyclic salt and composition comprising them
FR3090345B1 (en) 2018-12-21 2021-06-25 Oreal Process for dyeing keratin materials using a direct dye and an aliphatic ammonium salt and composition comprising them
FR3090358B1 (en) 2018-12-21 2020-12-18 Oreal Process for dyeing keratin materials using a direct dye and an unsaturated heterocyclic salt and composition comprising them
FR3097438B1 (en) 2019-06-24 2021-12-03 Oreal Anhydrous composition comprising at least one amino silicone, at least one alkoxysilane and at least one coloring agent
FR3097752B1 (en) 2019-06-27 2023-10-13 Oreal Process for coloring keratin fibers using a particular cyclic polycarbonate, a compound comprising at least one amine group and a coloring agent, composition and device
FR3097760B1 (en) 2019-06-28 2022-04-01 Oreal Process for dyeing keratin fibers comprising the application of an extemporaneous mixture of a direct dye and a composition comprising a liquid fatty substance, a solid fatty substance and a surfactant.
FR3097755B1 (en) 2019-06-28 2021-07-16 Oreal Process for dyeing keratin fibers comprising a step of cold plasma treatment of said fibers
FR3098114B1 (en) 2019-07-05 2022-11-11 Oreal Composition comprising a natural dye, a hydrazono and/or azo cationic synthetic direct dye and an aromatic compound
FR3098116B1 (en) 2019-07-05 2021-06-18 Oreal A composition comprising a natural dye, a triarylmethane direct dye and an aromatic compound
FR3103090B1 (en) 2019-11-20 2024-08-09 Oreal Coloring or lightening process using a hand-held hairdressing appliance and a substrate
FR3104952B1 (en) 2019-12-20 2022-08-26 Oreal Process for the cosmetic treatment of keratin fibers using a coloring composition and a composition based on rare earths
FR3104983B1 (en) 2019-12-20 2023-11-24 Oreal Hair coloring composition comprising a direct dye, a scleroglucan gum and a nonionic associative polymer.
FR3109313B1 (en) 2020-04-15 2022-11-25 Oreal METHOD FOR THE TREATMENT OF KERATIN MATERIALS USING AN ACRYLIC POLYMER OF ANHYDRIDE IN OILY DISPERSION AND A HYDROXYL AND/OR THIOLE COMPOUND
FR3111553A1 (en) 2020-06-22 2021-12-24 L'oreal Process for dyeing keratin fibers using a direct dye and a saccharinate salt and composition comprising them
FR3111557B1 (en) 2020-06-23 2022-11-25 Oreal Cosmetic composition comprising a polyhydroxyalkanoate copolymer comprising at least two different polymeric units with an (un)saturated hydrocarbon chain in a fatty medium
FR3111552B1 (en) 2020-06-23 2024-04-05 Oreal Composition for the simultaneous bleaching and coloring of keratin fibers comprising a particular heterocyclic salt and process using this composition
FR3111812B1 (en) 2020-06-24 2023-02-10 Oreal Cosmetic composition comprising a grafted polyhydroxyalkanoate copolymer in a fatty medium
FR3117805B1 (en) 2020-12-18 2024-02-16 Oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3117806B1 (en) 2020-12-18 2024-03-01 Oreal Composition for the simultaneous bleaching and coloring of keratin fibers and process using this composition
FR3117807B1 (en) 2020-12-18 2024-03-01 Oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
KR20230111217A (en) 2020-12-18 2023-07-25 로레알 How to Lighten Keratin Fibers
FR3117809B1 (en) 2020-12-18 2024-02-16 Oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3117808B1 (en) 2020-12-18 2024-03-01 Oreal Composition for the simultaneous bleaching and coloring of keratin fibers and process using this composition
FR3130570B1 (en) 2021-12-16 2024-11-01 Loreal Composition for lightening keratin fibres and method for lightening keratin fibres using this composition
FR3130572B1 (en) 2021-12-16 2024-08-23 Oreal Composition for lightening keratin fibres and method for lightening keratin fibres using this composition
FR3130568B1 (en) 2021-12-16 2024-02-16 Oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3130569B1 (en) 2021-12-16 2024-06-28 Oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3130567B1 (en) 2021-12-16 2024-02-16 Oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3130571B1 (en) 2021-12-16 2024-02-16 Oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3130610A1 (en) 2021-12-20 2023-06-23 L'oreal Composition comprising a polyhydroxyalkanoate copolymer with a long hydrocarbon chain containing ionic group(s), process for treating keratin materials using the composition
FR3136968A1 (en) 2022-06-22 2023-12-29 L'oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3136975A1 (en) 2022-06-22 2023-12-29 L'oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3136976A1 (en) 2022-06-22 2023-12-29 L'oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3136966A1 (en) 2022-06-22 2023-12-29 L'oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3136972A1 (en) 2022-06-22 2023-12-29 L'oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3136967A1 (en) 2022-06-22 2023-12-29 L'oreal Composition for lightening keratin fibers and process for lightening keratin fibers using this composition
FR3144510A1 (en) 2022-12-29 2024-07-05 L'oreal Composition comprising at least N,N-dicarboxymethyl glutamic acid, at least one direct dye, at least one cationic polysaccharide, and at least one non-cationic polysaccharide
FR3144513A1 (en) 2022-12-29 2024-07-05 L'oreal Composition comprising at least N,N-dicarboxymethyl glutamic acid, at least one direct dye, and at least one associative polymer
FR3144512A1 (en) 2022-12-29 2024-07-05 L'oreal Composition comprising at least N,N-dicarboxymethyl glutamic acid, at least one coloring agent, and at least one fatty amine
FR3144511A1 (en) 2022-12-29 2024-07-05 L'oreal Composition comprising at least one direct dye, at least N,N-dicarboxymethyl glutamic acid, at least one cationic surfactant and at least one non-silicone fatty substance in a particular content

Also Published As

Publication number Publication date
DE1644138A1 (en) 1971-05-27
GB1195386A (en) 1970-06-17

Similar Documents

Publication Publication Date Title
CH469060A (en) Process for the preparation of water-soluble, cationic monoazo dyes and the use thereof
CH518338A (en) Process for the preparation of water-insoluble monoazo dyes
CH513952A (en) Process for the preparation of water-insoluble monoazo dyes
AT287139B (en) Process for the preparation of new, water-soluble monoazo dyes
CH428034A (en) Process for the preparation of water-soluble monoazo dyes
CH519557A (en) Process for the preparation of water-insoluble monoazo dyes
CH473188A (en) Process for the preparation of water-insoluble monoazo dyes
CH517146A (en) Process for the preparation of water-insoluble disazo dyes
CH513947A (en) Process for the preparation of dyes and the use thereof
CH465091A (en) Process for the preparation of water-insoluble monoazo dyes
CH478884A (en) Process for the preparation of monoazo dyes
CH409187A (en) Process for the preparation of water-soluble monoazo dyes
CH485005A (en) Process for the preparation of water-soluble 2: 1 chromium complex monoazo dyes
AT269315B (en) Process for the preparation of new, water-soluble monoazo dyes
CH472478A (en) Process for the preparation of water-soluble azo dyes
AT265466B (en) Process for the preparation of new, water-insoluble monoazo dyes
CH481982A (en) Process for the preparation of water-insoluble monoazo dyes
AT287137B (en) Process for the preparation of new, water-soluble monoazo dyes
CH520180A (en) Process for the preparation of water-insoluble monoazo dyes
CH487976A (en) Process for the preparation of water-insoluble monoazo dyes
CH477533A (en) Process for the preparation of water-soluble monoazo dyes
CH477513A (en) Process for the preparation of water-soluble basic azo dyes
CH478206A (en) Process for the preparation of water-soluble monoazo dyes
AT260394B (en) Process for the preparation of new, water-insoluble monoazo dyes
CH449810A (en) Process for the preparation of water-soluble azo dyes