Patent ID: 8062729

Claim:
A cross-linked polymeric material prepared by reacting a composition comprising: a solvent component; and polymer reactants comprising: polyol; polyisocyanate; and hydroxy functional polyorganosiloxane; wherein the solvent component comprises a solvent combination selected from one of the following combinations: (a) butyl acetate, methyl n-amyl ketone and ethyl 3-ethoxypropionate; (b) butyl acetate, methyl n-amyl ketone, ethyl 3-ethoxypropionate and toluene; (c) butyl acetate, methyl n-amyl ketone, ethyl 3-ethoxypropionate and isopropanol; (d) butyl acetate, methyl n-amyl ketone, ethyl 3-ethoxypropionate, toluene and isopropanol; (e) butyl acetate and methyl n-amyl ketone; (f) butyl acetate, methyl n-amyl ketone and toluene; (g) butyl acetate, methyl n-amyl ketone, toluene and isopropanol; (h) butyl acetate and ethyl 3-ethoxypropionate; (i) butyl acetate, ethyl 3-ethoxypropionate and toluene; (j) butyl acetate, ethyl 3-ethoxypropionate and isopropanol; and (k) butyl acetate, ethyl 3-ethoxypropionate, toluene and isopropanol; and wherein the cross-linked polymeric material has a surface including raised microdomains and a surrounding polymer matrix, wherein the raised microdomains are more hydrophobic than the surrounding polymer matrix and the average diameter of the raised microdomains is about 0.1 micron to 5 microns; and the composition includes about 5 to 12 wt %, based on the total solids content of the cross-linked polymeric material, of the hydroxy functional polyorganosiloxane.