Aqueous preparations of dyestuffs or optical brighteners insoluble to difficulty soluble in water

Abstract From the Canadian patent

Described are aqueous stable, highly concentrated, finely, dispersed flowable preparations of dyestuffs and optical brighteners insoluble to difficulty soluble in water which preparations have a low content of dispersing agent and a particle size smaller than 10 µ, particularly smaller than 2 µ, characterized in that these preparations contain at least 10 per cent by weight of water at least 30 per, cent by weight of a finely dispersed dyestuff or optical brightener insoluble to difficulty soluble in water and, a mixture consisting of at most 10 per cent by weight of an anion-active dispersing agent, at most 5 per cent by weight of a nonionic dispersing agent and at most 35 per cent by …