Vat dye leveling with copolymers 2-oxo-nu-vinyl heterocyclic compound and acrylamides

Claim 1

A PROCESS FOR PRODUCING LEVEL DYEINGS ON TEXTILES FROM COTTON WITH VAT DYESTUFFS IN WHICH PROCESS DYEING IS PERFORMED IN THE PRESENCE OF A LINEAR ADDITIVE COPOLYMER OF A 2-OXO-N VINYL-HETEROCYCLIC COMPOUND WHICH IS PRESENT IN THE DYE-BATH IN AN AMOUNT OF 0.25 TO 5 PARTS PER 100 PARTS OF WATER, THE COPOLYMER BEING SELECTED FROM THE GROUP CONSISTING (A) OF A COPOLYMER WHICH CONSISTS OF POLYMERIC STRUCTURAL UNITS (1) OF 25 TO 70 MOL PERCENT OF AN ALIPHATIC RING-SATURATED 2-OXO - N - VINYL - HETEROCYCLIC COMPOUND OF 5 TO 6 RING ATOMS, (2) OF 60 TO 75 MOL PERCENT OF AN AMIDE SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE AND METHACRYLAMIDE, AND OF (3) 0 TO 45 MOL PERCENT OF VINYL ACETATE, AND (B) OF A COPOLYMER WHICH CONSISTS OF POLYMERIC STRUCTURAL UNITS (1) OF 25 TO 70 MOL PERCENT OF AN ALIPHATIC RING-SATURATED 2-OXO - N - VINYL - HETEROCYCLIC COMPOUND OF 5 TO 6 RING ATOMS, (2) OF 30 TO 75 MOL PERCENT OF THE SODIUM SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACID, AND (3) OF 0 TO 45 MOL PERCENT OF VINYL ACETATE.