Method for manufacturing a dye scavenging substrate

摘要

Method for manufacturing a dye scavenging substrate comprising: (a) providing an absorbent substrate; (b) passing the substrate through a bath containing an alkaline solution of a dye scavenging compound selected from: (i) a N-trisubstituted ammonium-2-hydroxy-3-halopropyl compound having the general formula (I) as defined in the claims, or (ii) a salt of epoxypropyl ammonium having the general formula (II) as defined in the claims, or a combination thereof; (c) subjecting the substrate to a pressure of 0.04 MPa to 0.40 MPa; (d) wrapping the substrate in a water impermeable material and rotating the substrate for a period of 12 hours to 60 hours; (e) removing the water impermeable material and passing the substrate through a bath containing an acid solution; (f) subjecting the substrate to a pressure of 0.15 MPa to 0.40 MPa; and (g) drying the substrate. Preferably the dye scavenging compound is (2,3-epoxypropyl)trimethylammonium chloride. The low pressure is step (c) and long curing time in step (d) results in a dye scavenging substrate with high dye pick-up performance.