Cationic compound, process for preparing same and treatment of textile material for improved dyeing

A method for improving the dyeing properties of a textile material, which comprises treating a textile material composed of a natural fiber, a regenerated fiber, a semisynthetic fiber, a polyvinyl alcohol fiber or a mixture thereof with a cationic compound represented by the following general formula before or after dyeing of the textile material with an anionic dye, an indigo dye or a vat dye:

• ##STR22## wherein A is a group represented by the following general formula:
• [II]:
• ##STR23## in which each of p and q is an integer of 1 to 8, n is an integer of 0 to 2, X is a halogen atom, each of R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.3 is independently an alkyl having 1 to 4 carbon atoms, an alkyl having 1 to 4 carbon atoms which has at least one substituent selected from the group consisting of hydroxyl and cyano, or an alkenyl having 2 to 4 carbon atoms, and each of Q.sub.1, Q.sub.2 and Q.sub.3 is independently a group of the following formula:
• ##STR24## in which Y is a halogen atom and X and Y may be the same or different.