Acid-dyeable acrylic fibres copolymerised with amino alkyl methacrylates for differential cross-dyeing

The equilibrium adsorption of acid dyes on acrylic fibres copolymerised wit h dimethyl amino ethyl methacrylate has been investigated. A typical charac teristic of this type of fibre is its excellent stable dyeability over a wi de pH range. This is due to the strong basicity of alkylamino groups in the copolymerised component, which makes it possible to dye the fibre thorough ly even in a weakly acidic dyebath using a normal dyeing processes of acryl ic fibre with cationic dye. Consequently it is useful for differential cros s-dyeing in a single dyebath.