Patent GB-612009-A (GB)
Title: Manufacture of dyestuff mixtures
IPC: C09B57/00
Filed: 1945-05-22
Abstract: Dyestuff mixtures are prepared by a process in which in a mixture comprising different dinitro- or dihalogen-dioxyanthraquinones which consist wholly or mainly of 1.5- or 1.8-dioxyanthraquinones containing two nitro groups or two halogen atoms as negative substituents of which such a proportion is in b -position as normally results from direct dinitration or dihalogenation of dioxy- or dialkoxyanthraquinones, or which consist wholly or mainly of a mixture of 1.5- and 1.8-dioxyanthraquinones negatively substituted as aforesaid, a part of the negative substituents is converted into or exchanged for substituted amino groups and another part is converted into or exchanged for primary amino groups by a method known to be capable of converting into or exchanging for primary amino groups, or substituted amino groups, nitro groups or halogen atoms present in aromatic compounds.  The starting materials may contain anthraquinones having -alkoxy groups, and may be obtained by dinitrating anthraquinone, replacing the nitro by alkoxy groups, dinitrating, and hydrolysing the -alkoxy groups.  The hydroxy groups of the starting materials may be etherified or esterified prior to the process, and hydrolysed subsequently.  Amines, e.g. aniline, toluidines, anisidines, p-aminophenol, p-phenylene diamine, may be reacted with part of the nitro groups, followed by reduction of the remainder, or complete reduction may be followed by partial alkylation or aralkylation.  The products dye masses, lacquers, spinning solutions, artificial polymerisation products, cellulose esters or ethers, e.g. cellulose acetate, acetate-propionate, or benzyl-cellulose blue to violet shades.  In examples, the crude product obtained by dinitrating anthraquinone, reacting the dinitro body with methyl alcoholic potash to give the dimethoxy body, dinitrating, and hydrolysing the methoxy groups is (1) reacted with aniline, followed by reduction; (2) reduced completely, and partially methylated with methyl alcohol.  Also in examples, a crude mixture of dinitroanthrarafine and dinitrochrysazine is (3) reacted with aniline and then reduced; (4) completely reduced and then partially benzylated; (5) dinitrochrysazine is reduced to diaminochrysazine and then partially methylated with methyl alcohol; (6) cellulose acetate is dyed blue with the product of (1) above.ALSO:Dyestuff mixtures are prepared by a process in which in a mixture comprising different dinitro- or dihalogen - dioxy - anthraquinones which consist wholly or mainly of 1.5- or 1.8-dioxyanthraquinones containing two nitro groups or two halogen atoms as negative substituents of which such a proportion is in b -position as normally results from direct dinitration or dihalogenation of dioxy- or dialkoxy - anthraquinones, or which consist wholly or mainly of a mixture of 1.5- and 1.8-dioxyanthraquinones negatively substituted as aforesaid, a part of the negative substituents is converted into or exchanged for substituted amino groups and another part is converted into or exchanged for primary amino groups by a method known to be capable of converting into or exchanging for primary amino groups, or substituted amino groups, nitro groups or halogen atoms present in aromatic compounds.  The starting materials may contain anthraquinones having b -alkoxy groups, and may be obtained by dinitrating anthraquinone, replacing the nitro by alkoxy groups, dinitrating and hydrolysing the a -alkoxy groups.  The hydroxy groups of the starting materials may be etherified or esterified prior to the process, and hydrolysed subsequently.  Amines, e.g. aniline, toluidines, anisidines, p-aminophenol, p-phenylene diamine, may be reacted with part of the nitro groups, followed by reduction of the remainder, or complete reduction may be followed by partial alkylation or aralkylation.  The products dye masses, lacquers, spinning solutions, artificial polymerization products, cellulose esters or ethers, e.g. cellulose acetate, acetate-propionate, or benzyl-cellulose blue to violet shades.  In examples, the crude product obtained by dinitrating anthraquinone, reacting the dinitro body with methyl alcoholic potash to give the dimethoxy body, dinitrating, and hydrolysing the methoxy groups is (1) reacted with aniline, followed by reduction, (2) reduced completely and partially methylated with methyl alcohol.  Also in examples, a crude mixture of dinitroanthrarufine and dinitrochrysazine is (3) reacted with aniline and then reduced, (4) completely reduced and then partially benzylated; (5) dinitrochrysazine is reduced to diaminochrysazine and then partially methylated with methyl alcohol; (6) cellulose acetate is dyed blue with the product of (1) above.