USE OF MIXTURES OF OPTICAL BRIGHTENERS TO IMPROVE THE WASH FASTNESS OF BRIGHTENED TEXTILES

摘要

An optical brightener mixture comprising A) at least one anionic brightener selected from the group consisting of derivatives of pyrazoline that bear sulfonic acid or sulfonate groups and such anionic brighteners as are reproduced in formulae 1 to 12, and B) at least one anionic brightener comprising a stilbene derivative that bears a sulfonic acid or sulfonate group on each of the two phenyl groups of stilbene and is substituted by a nitrogenous aromatic heterocycle at each of the two phenyl groups of stilbene is used for preparing brightened polyamide and/or polyurethane fibers possessing improved washfastness for the optical brightening.