Patent GB-452421-A (GB)
Title: Improvements in dyestuff mixtures
IPC: C09B1/28
Filed: 1935-02-15
Abstract: Dyestuff mixtures comprise a 1 : 4-diaminoanthraquinone of the general formula  <FORM:0452421/IV/1> (wherein R1 and R2 are each alkyl, hydroxyalkyl, chlorhyroxyalkyl, cycloalkyl or aralkyl and may be the same or different and up to 2 positions marked X may be substituted by OH, NH2, NH-alkyl or NO2) and at least one other 1 : 4-diaminoanthraquinone of the same general formula in which at least one of the groups R1 and R2 is not identical with either of those present in the first component.  The 1 : 4-diaminoanthraquinones of the above general formula are obtainable as described in Specifications 434,906, 441,043, 447,037, 447,088, 447,107, and 447,108.  The admixture may be effected by grinding, e.g. in a ball mill, or by dissolving the components in a solvent and precipitating. The mixtures are suitable for dyeing cellulose esters or ethers, especially acetate artificial silk, in stronger and purer shades than are obtainable with the individual components; they are applicable also for colouring hydrocarbons, waxes, fats, vinyl polymerization products, urea-formaldehyde and phenol - formaldehyde resins, synthetic rubber, lacquers and masses to be used for producing artificial silk.  The following examples are specified: (1) 1 : 4-Di-(monomethylamino) anthraquinone (20 parts) is mixed in a ball mill with 1 : 4-di-(mono-b -hydroxyethylamino)anthraquinone (80 parts); the mixture gives strong clear blue dyeings on acetate artificial silk; (2) 1 : 4 - Di - (n - butylamino)-anthraquinone (40 parts) is similarly mixed with 1 : 4 - di - (monomethylamino)anthraquinone; the mixture gives powerful blue dyeings on acetate artificial silk and may be used for colouring benzine; (3) A mixture of equal amounts of 1 : 4-di-(monomethylamino)-anthraquinone and 1 : 4 - di - (b  - phenylethyl-amino)anthraquinone gives powerful clear blue dyeings on acetate artificial silk; (4) A mixture of equal amounts of 1 : 4-di-(b -hydroxyethylamino)anthraquinone and 1 : 4-di-(b -hydroxypropylamino)anthraquinone gives similar dyeings; (5) A mixture of equal amounts of 1 - methylamino - 4 - benzylaminoanthraquinone and 1 - methylamino - 4 - b  - hydroxyethylaminoanthraquinone gives clear blue dyeings, fast to light, on cellulose acetate artificial silk; (6) A mixture of 1-cyclohexylamino-4-n-butylaminoanthraquinone (30 parts) and 1 : 4-di-(mono - g  - hydroxypropylamino)anthraquinone (70 parts) gives clear blue dyeings on cellulose acetate artificial silk; (7) A mixture of 1 : 4-di-(monomethylamino)anthraquinone (30 parts), 1 : 4 - di - (b  - hydroxyethylamino)anthraquinone (40 parts) and 1-n-butylamino-4-cyclohexylaminoanthraquinone (30 parts) gives similar dyeings on acetate artificial silk; (8) Equal amounts of 1 : 4-di-(n-propylamino)-anthraquinone and 1 : 4 - di - (methylamino)-anthraquinone are dissolved in concentrated hydrochloric acid with stirring and the solution is allowed to flow into water to precipitate a mixture giving powerful blue dyeings on acetate artificial silk.  Tables are given showing (1) pairs of dyestuffs; (2) groups of three dyestuffs, suitable for admixture, dyestuffs additional to those in the above examples being the 1-methylamino-4-n-butylamino-, 1-methylamino-4-cyclohexylamino-, 1-methylamino-4-b -phenylethylamino-, 1 - b  - phenylethylamino - 4 - cyclohexylamino-, 1 : 4-di-(b -hydroxypropylamino)-5 : 8-dihydroxy-, 1 : 4-di-(g -chloro-b -hydroxypropylamino) - 5 - nitro-, 1 : 4 - di - (b  - hydroxyethylamino) - 5 : 8 - dihydroxy-, 1 : 4-di-(monoethylamino)-, 1 : 4-di-(cyclohexylamino)-, 1 -methylamino - 4 - b  - hydroxypropylamino-, 1 : 4 - di-(benzylamino)-, 1 - ethylamino - 4 - b  - hydroxyethylamino-, 1 - butylamino - 4 - benzylamino-, 1-cyclohexylamino-4-benzylamino-, 1-benzylamino - 4 - b - hydroxyethylamino-, 1 - butylamino - 4 - b  - hydroxypropylamino-, 1 - ethylamino - 4 - b  - hydroxypropylamino-, 1 -ethylamino-4-cyclohexylamino-, 1-cyclohexylamino-4-b -hydroxypropylamino-, 1-methylamino-4-n-propylamino, 1 : 4 - di - (n - propylamino)-, 1 - b  - hydroxyethylamino - 4 - cyclohexylamino-, 1 - b  - hydroxyethylamino - 4 - phenylethylamino-, 1-b -phenylethylamino-4-cyclohexylamino- and 1 - b  - hydroxyethylamino - 4 - b  - hydroxypropylamino-derivatives of anthraquinone. Specifications 219,349, [Class 15 (ii)], and 428,767 are referred to.