Fluorochemical composition comprising a polymer derived from a fluorochemical urethane (meth)acrylate monomer for imparting stain release properties to a substrate

摘要

The present invention provides a fluorochemical composition comprising a polymer derived from polymerization of monomer corresponding to general formula (I), wherein Rf is selected from the group consisting of perfluorinated or partially fluorinated aliphatic groups; L<1> and L<2> each independently represent an organic divalent linking group and may be the same or different; L<3> represents an organic linking group with a valence of n + 1; t is 0 or 1; n is an integer of 2 to 20; A<1> and A<2> each independently represent a divalent residue obtained by removing two -NCO groups from a corresponding diisocyanate and may be the same or different; X<1> and X<2> are each independently selected from the group consisting of O, NH and S; B<1> represents a hydrophilic residue obtained by removing the groups HX<1> and HX<2> from a compound HX<1>-B<1>-X<2>H that comprises a poly(oxyalkylene) group; G represents a free radical polymerizable group; s is 0 or 1 with the proviso that when s is 0, L<2> represents a hydrophilic segment comprising a poly(oxyalkylene) group or said polymer is derived from a copolymerization of a monomer according to formula (I) and a poly(oxyalkylene) group containing monomer. Substrates treated with the fluorochemical composition show good stain release properties in particular for oily stains and water based stains such as tea and coffee.