Silicone emulsion and methods for the preparation and use thereof

A silicone release coating emulsion comprising

• (A) 100 weight parts of an aliphatically unsaturated polyorganosiloxane composition comprising
• (A1) 25 weight parts to 100 weight parts of a hexenyl-functional polyorganosiloxane of unit formula (R13SiO1/2)a(R12R2SiO1/2)b(R12SiO2/2)c(R1R2SiO2/2)d(SiO4/2)e, where R1 is an alkyl group, R2 is a hexenyl group, subscript a is 0 to 4, subscript b is 0 to 4, subscript c is 0 to 400, subscript d is 0 to 50, and subscript e is 0 or 1, with the provisos that (a+b)=2 to 4, (b+d)≥2, (a+b+c+d) is 15 to 400, and
• (A2) 0 to 75 weight parts of a vinyl-functional polyorganosiloxane of unit formula (R13SiO1/2)i(R12R3SiO1/2)f(R12SiO2/2)g(R1R3SiO2/2)h(SiO4/2)j, where R1 is an alkyl group, R3 is a vinyl group, subscript i is 0 to 4;
• subscript f is 0 to 4;
• subscript g is 0 to 1400;
• subscript h is 0 to 200;
• and subscript j is 0 or 1;
• with the provisos that (i+f)=2 to 4, (f+h)≥2, and (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 starting material (B) to a combined amount of vinyl and hexenyl groups in starting material (A) (i.e., an SiH/Vi ratio) of 1.2/1 to 3.0/1;
• (C) a hydrosilylation reaction catalyst in an amount sufficient to provide 10 to 1000 ppm of a platinum group metal based on combined weights of starting materials (A) and (B);
• (D) 0.02 weight part to 0.8 weight part, per 100 weight parts of starting material (A), of a hydrosilylation reaction inhibitor;
• (E) water;
• (F) 0.4 weight part to 1.6 weight parts, per 100 weight parts of starting material (A), of a buffer;
• (G) 0 to 3.0 weight parts, per 100 weight parts of starting material (A), of a surfactant;
• and
• (H) 0 to 10.0 weight parts, per 100 weight parts of starting material (A), of a polyvinyl alcohol,
• with the proviso that combined amounts of starting materials (G) and (H) is ≥0.1 weight part, per 100 parts by weight of starting material (A);
• and
• with the proviso that the emulsion is free of stabilizers selected from aliphatic polyethers, (co)polyacrylamides, polysaccharides, and polyacrylates and free of unreactive organopolysiloxanes.