Silicone release coating emulsion, method for its preparation, and use for bakery paper

A silicone release coating emulsion comprising:

• (A) an aliphatically unsaturated polyorganosiloxane of unit formula (R13SiO1/2)i(R12R3SiO1/2)f(R12SiO2/2)g(R1R3SiO2/2)h(SiO4/2)j, each R1 is an independently selected alkyl group, each R3 is an independently selected alkenyl group, subscripts i, f, g, h, and j represent average numbers of each siloxane unit per molecule, and subscripts i, f, g, h, and j have values such that 0≤i≤4;
• f is 0 to 4;
• 0≤g≤1400;
• 0≤h≤200;
• and j is 0 or 1;
• with the provisos that a quantity (i+f)=2 to 4 then a quantity (f+h)≥2, and a quantity (i+f+g+h) is 15 to 1400;
• (B) a polyorganohydrogensiloxane in an amount sufficient to provide a molar ratio of silicon bonded hydrogen atoms in (B) the polyorganohydrogensiloxane to silicon bonded alkenyl groups in (A) the aliphatically unsaturated polyorganosiloxane (an SiH:SiVi ratio) of 1.2:1 to 3.0:1;
• (C) a hydrosilylation reaction catalyst in an amount sufficient to provide 10 ppm to 1000 ppm of a platinum group metal based on combined weights of (A) the aliphatically unsaturated polyorganosiloxane and (B) the polyorganohydrogensiloxane;
• 0.02 weight part to 0.8 weight part, per 100 weight parts of (A) the aliphatically unsaturated polyorganosiloxane, of (D) a hydrosilylation reaction inhibitor;
• (E) water;
• 0.4 weight part to 1.6 weight parts, per 100 weight parts of (A) the aliphatically unsaturated polyorganosiloxane, of (F) a buffer;
• 0.05 weight part to 10 weight parts, per 100 weight parts of (A) the aliphatically unsaturated polyorganosiloxane, of (G) an alkenyloxypolyether, wherein amounts of (B) the polyorganohydrogensiloxane and (G) the alkenyloxypolyether are sufficient to provide a molar ratio of silicon bonded hydrogen atoms in (B) the polyorganohydrogensiloxane to alkenyl groups in (G) the alkenyloxypolyether (SiH:alkenyl ratio) of 2:1 to 25:1;
• 0 to 10 weight parts, per 100 weight parts of (A) the aliphatically unsaturated polyorganosiloxane, of (H) a polyvinyl alcohol compound;
• optionally (I) a biocide;
• 0 to 0.3 weight parts, per 100 weight parts of (A) the aliphatically unsaturated polyorganosiloxane, of (J) an anti-foam;
• and
• 0 to 15 weight parts, per 100 weight parts of (A) the aliphatically unsaturated polyorganosiloxane, of (K) a non-functional polyorganosiloxane of unit formula (R13SiO1/2)2(R12SiO2/2)c, where R1 is as described above, and subscript c has a value sufficient to give the non-functional polyorganosiloxane a viscosity of 5 to 60,000 cSt when tested at 25° C. by rotational viscometry.