abstract |
(57) Summary Based on the weight of the mixture, Formulas I and II: A whitening agent mixture containing 75% to 100% by weight of a bisstyryl compound of (wherein the bisstyryl compounds I and II are present in a weight ratio of 10:90 to 70:30), a formulation comprising the novel mixture, and Its use for optical brightening of synthetic, semi-synthetic or natural polymeric substances. |