Verfahren zum Färben von Polyamiden

摘要

1,215,476. Mass dyed polyamides. FARBENFABRIKEN BAYER A.G. 18 Dec., 1967 [17 Dec., 1966], No. 57318/67. Heading C3R. Polyamide filaments or fibres are mass dyed with 0À01 to 2 wt. per cent of an anthraquinone dye of the formula where R is H, CH 3 or -C 6 H 4 .CH 3 ; R 1 is H or -SO 3 Na and R 2 is H, -NH.C 6 H 4 .CH 3 or The only such dyes specified are those of the formulµ They may be prepared by dissolving the dye in a polyamide to provide a concentrate used to colour a melt of the same or a different polyamide which is melt spun. In examples concentrates of the two specified dyes in nylons 6 and 6/66 (85 : 15 by wt.) respectively are used in the melt spinning of nylon 6.