Patent GB-541730-A (GB)
Title: Improvements relating to dyestuff preparations
Filed: 1940-06-07
Abstract: 541,730. Dye preparations ; dyeing textiles. SOC. OF CHEMICAL INDUSTRY IN BASLE. June 7, 1940, Nos. 9963 and 9964. Convention dates, June 8, 1939, and May 9, 1940. [Classes 2 (iii) and 15 (ii)] Preparations for use in producing strong blue dyeings on cellulose acetate artificial silk comprise a mixture of two or more blue-dyeing dyestuffs of the general formula wherein X represents -CN, halogen or -SO 2 - alkyl, Y represents halogen or NO  2 , R 1  represents the residue of a benzene nucleus, which may be substituted, R  2  represents H or hydroxyalkyl and the hydroxyethylamino group is in pposition to the azo group. Such preparations may be obtained by (a) using mixtures of appropriate intermediate products for the manufacture of the dyestuffs, (b) precipitation from a solution of the dyestuffs in a common solvent, (c) finely grinding the dyestuffs together or (d) adding the previously dispersed dyestuffs to the same dyebath. Suitable dyestuffs are described in Specifications 447,561, 451,970 and 505,854. Specified diazo components are the 4-nitro- 2-cyano-6-chloro-, 2:4-dinitro-6-methylsulphone-, 2:4- dinitro-6-chloro- and 2:4- dinitro-6-cyanoderivatives of aniline and specified coupling components are the 3-methyl-N-di- (hydroxyethyl)-, 3-methyl-N-hydroxyethyl-, 3- methyl-6-methoxy-N-di- (hydroxyethyl)-, 3- methyl-6-methoxy-N-hydroxyethyl-, 3 : 6- dimethoxy-N-di-(hydroxyethyl)-, 3 : 6-diethoxy- N-di-(hydroxyethyl)- and 3-acetylamino-6-methoxy-N-di- (hydroxyethyl)- derivatives of aniline. In examples, (1) equal weights of the dyestuffs, 2 :4-dinitroaniline- 6-methylsulphone# 3- methyl-N-di-(hydroxyethyl)-aniline and 2 : 4- dinitroaniline -6-methylsulphone # 3-methyl-6- methoxy -N-hydroxyethyl-aniline, are ground together with sulphite cellulose lye or other dispersing agent ; the paste obtained may be dried and ground ; (2) equal weights of 10 per cent aqueous pastes of the dyestuffs in (1) are stirred into a solution at 50‹C. of soap or a soaplike material, such as the sodium salt of the acid sulphuric ester of oleyl alcohol or sodium Á-heptadecyl - N - benzyl - benzimidazole - diulphonate, and the mixture is diluted with warm water; cellulose acetate artificial silk is introduced into this solution and dyed a deep blue at 75-80‹C. A table is also given specifying various mixtures of the dyestuffs. Specification 219,349, [Class 2 (iii)], also is referred to. 3 : 6 -Diethoxy-N-di-(hydroxyethyl)-aniline is obtained by the action of ethylene chlorhydrin on 3 : 6- diethoxyaniline in presence of magnesia. The Specification as open to inspection under Sect. 91 comprises also the similar preparation and use of mixtures of two or more dyestuffs of the above general formula all dyeing blue or all dyeing brown tints in which R 2  may additionally be alkyl. Additional specified diazo components are the 4-nitro-2 : 6-dichloro-, and 4-nitro-2-chloro-6-bromoderivatives of aniline and additional coupling components are the 3-methyl-N-ethyl-or butyl-N-hydroxyethyl-, 3-methyl-6-methoxy-N-methyl- or ethyl-N- hydroxyethyl- and 3-methylsulphone-N-ethyl- N-hydroxyethylderivatives of aniline. This subject-matter does not appear in the Specification as accepted.