PREPARATION OF A DISPERSE DYESTUFF CONTAINING A PHOSPHORIC ACID ESTER, HAVING IMPROVED SAFETY PROPERTIES AND HIGHER DYESTUFF YIELD WHEN DYED ON SYNTHETIC MATERIALS

1518434 Disperse dye compositions HOECHST AG 27 May 1976 [28 May 1975] 22080/76 Heading D1B Solid or liquid disperse dye preparations used in the pad-dyeing and printing of synthetic and semi-synthetic fibrous materials contain 5-60% by weight of one or more disperse dyes, 5 to 90% of a dispersing agent, 0-90% of a wetting agent, 0-60% of a grinding auxiliary 0-90% of water and 0.5 to 30% by weight (referred to the weight of the solid or liquid dyestuff preparation) of at least one organic phosphoric acid ester of formula: or of formula: in which n is 2 or 3 m is 0 or an integer 1 to 10 and R is an alkyl radical having 8 to 20 carbon atoms or a mixture of phosphoric acid esters of the above two formulae. The preparations may be obtained by adding the esters to the other ingredients before, during or after fine division thereof. These preparations have improved safety and higher dyeing yield. -