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    Hydrazinium dyes, with maleic acid or its salts and dyeing therewith
    3.
    发明授权
    Hydrazinium dyes, with maleic acid or its salts and dyeing therewith 失效
    腙染料，用马来酸或其盐染色

    公开(公告)号：US3357782A

    公开(公告)日：1967-12-12

    申请号：US34012164

    申请日：1964-01-20

    Applicant: SANDOZ LTD

    Inventor： JOSE CARBONELL ,  VIKTOR SANAHUJA ,  HANS SIEGRIST

    IPC: C09B69/00

    CPC classification number: C09B69/00 ,  Y10S8/922 ,  Y10S8/927

    Abstract: The invention provides a process for the dyeing or printing of fibres, films, filaments or fabrics of polyacrylonitrile, polyesters or polypropylene with basic dyes and including in the process as dyeing or printing assistants dibasic carboxylic acids having 2-6 carbon atoms or salts. The dyes used are those of formula in which A is a dye radical other than a phthalocyanine dye, Y is a substituted or unsubstituted alkylene group or a bridge member bound by such a group to the adjacent nitrogen atom, R1 is a substituted or unsubstituted alkyl, cycloalkyl, or aralkyl radical, or together with R2 and the adjacent nitrogen atom forms a heterocyclic ring, or together with the bridge member Y and the adjacent nitrogen atom forms a heterocyclic ring system, R2 is a substituted or unsubstituted alkyl, cycloalkyl or aralkyl radical, or together with R1 and the adjacent nitrogen atom forms a heterocyclic ring, R3 and R4 arc hydrogen or identical or different substituted or unsubstituted alkyl cycloalkyl or aralkyl radicals or identical or different acyl radicals or R3 and R4 together represent a dibasic acyl radical, or alternatively R1 or R2 together with R3 or R4 and the nitrogen atoms adjacent to these substituents can form a saturated or unsaturated 5 or 6 membered heterocyclic ring, n is an integer and - the negative charge of an anion. The dyes are preferably soluble in water at 80 DEG C. and are free from anionic groups. Dibasic acids specified as assistants are maleic and tartaric acids and their mono-sodium, potassium, ammonium salts also the disodium, potassium and ammonium salts. Fibres dyed are polyacrylonitrile and polyester fabrics which may be in conjunction with wool or cotton nylon or acetate a disperse dye being used to dye the latter. The dyeing is best effected at pH 2-7 at temperatures of 60-120 DEG C., the basic dye being pasted with an acid before adding to the dyebath.

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