Patent ID: 6926746

Claim:
Process for protecting reduction-sensitive dyes in the course of dyeing or printing fiber materials with dyes, where a dyeing or a print process utilizes a compound of the formula (I) as well as mixtures thereof where A is a quaternary ammonium ion, or A is where R is hydrogen or linear or branched C 1-4 alkyl group, Y is hydrogen, a direct bond, where o, p, p′, q, q′, q″ and q′″ are independently 1, 2 or 3, Z is hydrogen or where X is a direct bond or a C 1-4 alkylene group, n and n′ are each a natural number subject to the proviso that n and n′ are independent of each other and n is never 0, m is 0 when Y is hydrogen, is 1 when Y is a direct bond, is 2 when Y is