Azo dyes with an acetalized diazo component of the thiophene or thiazole series

摘要

Azo dyes of the formula <IMAGE> where L1, L2, L3, L4, X and K are as defined in the specification, and crystal forms of thienylazobenzene dyes are useful for dyeing or printing textile materials such as polyesters, fibers or fabrics made of cellulose esters or polyamides or blend fabrics from polyester and cellulose fibers with high color strength, good fastness properties and brilliant hues.