Flourochemical composition containing a condensation product of a flourochemicalpolyether and a poly-isocyanate to impart stain release properties to a substra te

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) (Rf')k-L2-X2H wherein: B represents an organic residue obtained by removing the groups HX1 and HX2 from the compound in formula (II); X1 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; Rf 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.