| abstract |
Release coating compositions are provided that include a combination of branched polyorganosiloxanes. The first branched siloxane in combination, unit formula: (R 1 3 SiO 1/2) a (R 2 R 1 2 SiO 1/2) b (R 1 2 SiO 2/2) c (SiO 4/2) d (a ≧ 0, b> 0, c ≦ 995, and d> 0) MDQ siloxane. The second branched siloxane in combination, unit formula: (R 1 3 SiO 1/2) e (R 2 R 1 2 SiO 1/2) f (R 1 2 SiO 2/2) g (R 1 SiO 3 / 2 ) MDT silsesquioxane with h (e ≧ 0, f> 0, g ≦ 995, and h> 0). Each R 1 is independently a monovalent hydrocarbon group containing no aliphatic unsaturation, and each R 2 is an aliphatic unsaturated hydrocarbon group. The release coating composition further comprises a crosslinker having at least three silicon-bonded hydrogen atoms per molecule and a platinum group metal catalyst. [Selection diagram] Fig. 1 |