Patent GB-448508-A (GB)
Title: Process for the manufacture of colour lakes
IPC: C09B23/02
Filed: 1934-12-05
Abstract: Colour lakes are prepared by treating a cyanine, carbocyanine or styryl dye containing an indolene nucleus and which may contain acid groups, with complex compounds of tungstic or molybdic acid. Such lakes may be prepared in substance or on a substratum or on p  the fibre yielding clear shades fast to oil, spirit and light.  In examples: (1) 1.3.3 : 1<1> . 3<1> . 3<1> - hexamethylindocyanine chloride is precipitated with a phosphotungstomolybdic acid to give a yellow lake; (2) 1.3.3 : 1<1>.3<1>.3<1>-hexamethyl - 5 . 5<1> - dimethoxyindocarbocyanine chloride is stirred with aluminium hydroxide paste and precipitated by adding silicotungstic acid to give a violet printing colour; the corresponding 1.3.3 : 1<1>.3<1>.3<1> hexamethylindocarbocyanine chloride and phosphate yield reddish lakes, while the 1.3.3 : 3<1>.3<1>-pentamethyl - 1<1> - ethylindocarbocyanine phosphate (prepared according to Specification 396,177) yields a violet lake; (3) 1.3.3-trimethyl - 2 - p - diethylaminostyryl indoleninium chloride is stirred with a paste of heavy spar and alumina and precipitated by means of a phosphotungstic acid to give a violet lake; similar lakes are thus derived from 1.3.3-trimethyl - 2 - p - diethylaminostyryl - 5 - methoxyindolenium chloride, 1.3.3-trimethyl-2 - p - diethylaminostyryl - 5 - phenylindolenium phosphate (prepared from 1.3.3-trimethyl-5-phenyl - 2 - methyleneindolene and p - diethylamino benzaldehyde condensed in glacial acetic acid and salted out with sodium phosphate), 1.3.3 - trimethyl - 2 - p - diethylaminostyryl - 4.5 - and 6.7 - benzoindolenium chlorides, and 1 - ethyl - 3.3<1> - dimethyl - 2 - p - diethylaminostyryl - 6.7 - benzoindolenium phosphate (prepared by salting out the primary condensation product with sodium phosphate); (4) 1.3.3-trimethyl - 2 - p - diethylaminostyryl - 4.5-sulphobenzoindolenium sulphate (derived from 1.3.3 - trimethyl - 2 - methylene - b  - naphthindolene and diethylaminobenzaldehyde and sulphonating the product) is mixed with a phosphotungstic acid and alumina paste and precipitated by adding barium chloride to give a violet colour lake; the corresponding 6.7-sulphobenzoindolenium compound (similarly obtained) so treated yields a bluish-violet colour; (5) 1.3.3-trimethyl-2-p-diethylaminostyryl - 4.5 - sulphoindolenium sulphate is dyed on wool and after-treated with phosphotungstic acid to give a violet shade; (6) 1.3.3-trimethyl-2 - styryl - b  - (a  - phenyl - N - methylindole - b  -) - indolenium chloride (derived according to Specification 448,936) is dyed on cotton mordanted with tannin-antimony and after-treated with phosphotungstic acid to give an orange shade; treatment of this compound in substance with phosphotungstomolybdic acid gives an orange precipitate.  Indolenes.--1.3.3 - Trimethyl - 5 - phenyl - 2 - methyleneindolene is prepared by dimethylating 2.3 - dimethyl - 5 - phenylindole derived according to Specification 409,350. 1.3.3-Trimethyl - 2 - methylene - b  - naphthindolene is prepared by methylating 2.3 - dimethyl - b  - naphthindole derived according to Specification 409,350.