product were conducted as in example 1 a one weight percent aqueous solution has a ph of 11 10 and remains substantially clear at temperatures of up to 50 u00b0 c a draves sink time of 246 seconds is observed for a 0 1 weight percent aqueous solution and a surface tension of 28 9 dynes per centimeter the draves sink test originally described by c z draves and r g clarkson in volume 20 american dyestuff reporter pages 201 208 1931 has been adopted as standard test method 17 1952 reported in the technical manual of the american association of textile chemists and colorists 1964 a polyglycerol is prepared by dehydrating glycerol in the presence of sodium hydroxide as catalyst obtaining a polyglycerol having an average number of glycerol units per molecule as indicated below in table no i and thereafter the polyglycerol so produced is reacted in the proportions indicated in table no i with a material providing a suitable hydrophobic moiety to produce a surfactant material having the indicated properties for the sake of completeness the results of example 1 are also included in table i table i______________________________________results of tests of various poly glycerol hydrophobe surfactant hydro ex gu phobe ratio st ds cp s______________________________________1 5 b 3 28 9 246 50 sol 2 10 a 3 2 28 8 65 gt 100 sol 3 10 a 2 3 29 7 110 gt 57 sol 4 20 b 3 28 5 126 94 sol 5 17 b 2 28.