Dispersionen von optischen Aufhellungsmitteln mit salzbildenden wasserloeslichmachenden Gruppen

摘要

1,250,207. Dispersions of optical brighteners. FARBWERKE HOECHST A.G. 20 Dec., 1968 [23 Dec., 1967], No. 60764/68. Heading B1V. [Also in Division D1] A stable dispersion of an optical brightener containing a carboxylic acid and/or sulphonic acid group in a liquid dispersing medium consisting of an anhydrous water miscible di- or trihydric alcohol and/or an ether of the alcohol and/or a water-soluble polyether of the alcohol may contain 10% to 90% optical brightener. The optical brightener may be a water soluble derivative of bis-triazinylaminostilbene disulphonic acid or a water soluble 1,3 diaryl pyrazoline; examples are given. The dispersions may be prepared by treating the optical brightener with the dispersing medium and optionally with a non-ionic dispersing agent, for example polyethoxylated nonyl phenol, in a kneading or milling device until the particles have sizes 0.5 to 3 micrometres.