Method for manufacturing a dye scavenging substrate

A method for manufacturing a dye scavenging substrate which comprises the steps of:

• (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):
• wherein R1, R2, R3 are each independently methyl, ethyl, butyl, benzyl or an hydroxyl substituted derivative thereof, X′ is a halogen atom, and Y′− is chloride, bromide, sulfate or sulfonate;
• or
• (ii) a salt of epoxy propyl ammonium having the general formula (II):
• wherein R4, R5, R6 and Y″− have the same meaning as R2, R3 and Y′−, respectively, as defined above, or
• (iii) a combination thereof;
• (c) subjecting the substrate to a pressure of from about 0.04 MPa to about 0.40 MPa;
• (d) wrapping the substrate in a water impermeable material and rotating the substrate for a period of from about 24 hours to about 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 from about 0.15 MPa to about 0.40 MPa;
• and
• (g) drying the substrate.