Polysiloxane controlled release additive, method for the preparation thereof, and release coating composition

A release coating composition comprising:

• (A) a polysiloxane comprising unit formula:
• where
• each RM is an independently selected monovalent hydrocarbon group of 1 to 30 carbon atoms that is free of aliphatic unsaturation,
• each RU is an independently selected monovalent aliphatically unsaturated hydrocarbon group of 2 to 30 carbon atoms,
• each RD is an independently selected divalent hydrocarbon group of 2 to 30 carbon atoms,
• subscript a≥30,
• subscript b≥40,
• subscript c≥1,
• subscript d≥1,
• a quantity (c+d)≥1,
• subscript e≤20,
• subscript q≥0,
• subscript r≥0, and
• provided that the polysiloxane has a silanol content up to 1.7 weight %;
• (B) a polyorganohydrogensiloxane having at least two silicon-bonded hydrogen atoms per molecule;
• (C) a hydrosilylation reaction catalyst;
• (D) a polyorganosiloxane having at least two silicon bonded aliphatically unsaturated groups per molecule;
• (E) a solvent;
• and
• (F) a hydrosilylation reaction inhibitor;
• where (A) the polysiloxane is present in an amount of 1 weight % to 75 weight %;
• (B) the polyorganohydrogensiloxane is present in an amount of 0.1 weight % to 5 weight %,
• (C) the hydrosilylation reaction catalyst is present in a catalytically effective amount sufficient to catalyze hydrosilylation reaction,
• (D) the organopolysiloxane having at least two silicon-bonded aliphatically unsaturated groups per molecule is present in an amount of from 20 weight % to 98 weight %,
• (E) the solvent is present in an amount of from greater than 0 to 98 weight %, and
• (F) the hydrosilylation reaction inhibitor is present in an amount of from 0.002 weight % to 0.15 weight %,
• each based on combined weights of (A), (B), (C), (D), (E), and (F).