Patent ID: 6162369
Filing Date: 2000-12-19
Classification: C08G

Abstract:
A method for preparing a fluorochemical composition comprising a polyurethane by reacting:(A) fluorochemical oligomer of formula (I)M.sup.f.sub.m M.sub.n --Q.sup.1 --T.sup.1 (I)wherein:M.sup.f.sub.m M.sub.n represents fluorochemical oligomer comprising m units derived from fluorinated monomer and n units derived from fluorine-free monomer and wherein the fluorinated monomers and fluorine-free monomers may be the same or different;m represents a value of 2 to 40;n represents a value of 0 to 20;T.sup.1 is --OH or --NH.sub.2 ;Q.sup.1 and T.sup.1 together represent an organic residue obtained by removing a hydrogen atom from a chain transfer agent that is functionalized with T.sup.1,(B) difunctional compound capable of reacting with an isocyanate; and(C) monofunctional compound capable of reacting with an isocyanate and comprising a poly(oxyalkylene) group; with(D) triisocyanate.