| 摘要 |
1368263 Dyeing cellulose with azoic dyes FARBWERKE HOECHST AG 19 Nov 1971 [20 Nov 1970] 53836/71 Heading D1B Wound packages of cellulose yarn or sliver are injected with one or more aqueous solutions each comprising an alkaline substance and at least two azo coupling components of different diffusibility and are then impregnated with a weakly acidic aqueous liquor comprising one or more diazonium compounds derived from an aromatic amine. The preferred alkaline substance is sodium hydroxide and preferred coupling components are arylamides or aromatic or heterocyclic o-hydroxy carboxylic acid or of an acylacetic acid, or an aromatic or heterocyclic hydroxy compound or a compound containing an neolisable or enolized ketomethylene group in a heterocyclic ring. Preferably the package is allowed to dwell while moist after the injection and before impregnation, e.g. for 5 to 10 minutes. The impregnation may be effected at 20 to 50‹C for 10 to 45 minutes. Multi-colour effects are obtained. |
