86 g of diethanolamine was added and the reaction was stirred for 2 hours at 65 u00b0 c to provide the diethanolamine salt of the resulting polyfluoropolyether based phosphate of formula i wherein j q and r were each 1 r f was c 2 f 5 the resulting product was applied to paper samples white bleached 50 paper for oil repellency testing using test method 1 results are in table 3 a penetrating solution was prepared containing a fluorine concentration of 0 8 fluorine by weight and was applied to limestone and concrete substrates as described in test methods 6 and 7 the substrate samples and untreated controls were tested for water repellency oil repellency and stain resistance according to test methods 6 and 7 the test results are shown in tables 4 and 5 the product of this example was also tested for surface tension according to test method 3 the resulting data is in table 9 the product of this example was added to semi gloss latex paint high gloss latex paint and matte latex paint in an amount of 0 3 by weight the contact angle was measured using test method 4 and the resulting data is in tables 11 and 12 resistance to blocking was measured according to.