FLUOROCHEMICAL COMPOSITION CONTAINING A CONDENSATION PRODUCT OF A FLUOROCHEMICAL POLYETHER AND A POLY-ISOCYANATE TO IMPART STAIN RELEASE PROPERTIES TO A SUBSTRATE

摘要

This invention discloses a fluorochemical composition comprising a condensation product of a diisocyanate or triisocyanate and at least one polyether obtainable by reacting a fluorochemical substituted epoxide of formula (I) with a compound of formula (II) HX1-B-X2H or (III) (R¿f?')k-L?2-X2¿H wherein: B represents an organic residue obtained by removing the groups HX?1 and HX2¿ from the compound in formula (II); X?1 and X2¿ are each independently selected from the group consisting of O, NH and S; L1 represents an organic divalent linking group; L2 represents an organic linking group having a valence of k+1; k is an integer of 1 to 10; R¿f? and Rf' are each independently selected from the group consisting of perfluorinated and partially fluorinated aliphatic groups; s is 0 or 1; and a is 0 or 1. The fluorochemical composition is particularly suitable for imparting stain release properties to a substrate. Further disclosed are a method of preparation of the fluorochemical composition and a method of treatment of a substrate with the fluorochemical composition.