Silicone pressure sensitive adhesive composition containing a polyfluoropolyether silane additive and methods for the preparation and use of said composition

A silicone pressure sensitive adhesive composition comprising:

• 30 weight % to <80 weight %, based on combined weights of starting materials (A) to (G), of (A) an alkenyl-functional polydiorganosiloxane comprising unit formula:
• (RM2RUSiO1/2)a(RM3SiO1/2)b(RM2SiO2/2)c(RMRUSiO2/2)d(RMSiO3/2)e(RUSiO3/2)f(SiO4/2)g, where
• each RM is an independently selected alkyl group of 1 to 30 carbon atoms;
• each RU is an independently selected alkenyl group of 2 to 30 carbon atoms;
• and
• subscripts a, b, c, and d represent average numbers of each unit per molecule,
• subscript a≥0,
• subscript b≥0,
• subscript c≥0,
• subscript d≥0,
• subscript e≥0,
• subscript f≥0,
• a quantity (a+d+f)≥2,
• subscript g≥0, and
• a quantity (a+b+c+d+e+f+g) is 4 to 10,000;
• 0.5 weight % to 5 weight %, based on combined weights of starting materials (A) to (G), of (B) a polyorganohydrogensiloxane comprising unit formula (RM3SiO1/2)dd(HccRM(3-cc)SiO1/2)h(SiO4/2)i(ZO1/2)ee,
• where RM is as described above,
• each Z is independently selected from the group consisting of hydrogen and RM,
• subscripts dd and h represent relative weights of monofunctional siloxane units in the formula,
• subscript i represents relative weight of tetrafunctional siloxane units in the formula,
• subscript dd≥0,
• subscript h>0,
• subscript i>0,
• subscripts dd, h, and i have values sufficient to provide the polyorganohydrogensiloxane with a weight ratio of monofunctional units:tetrafunctional units {(dd+h):i} of 0.4:1 to 2:1,
• subscript ee represents relative weight of hydrolyzable groups in the formula,
• subscript ee≥0,
• subscript ee has a value sufficient to provide 0 to 2 weight % of hydrolyzable groups based on weight of the polyorganohydrogensiloxane;
• subscript cc represents the number of silicon bonded hydrogen atoms in each monofunctional unit,
• 2≥cc≥1;
• and
• where starting material (B) is present in a sufficient amount to provide a molar ratio of silicon bonded hydrogen atoms to alkenyl groups in starting material (A) (SiH:Vi ratio) of 0.5 to 20;
• a sufficient amount of (C) a platinum group metal hydrosilylation reaction catalyst to provide 1 ppm to 5,200 ppm of the platinum group metal, based on combined weights of starting materials (A) to (G);
• 10 to 50 weight %, based on combined weights of starting materials (A) to (G), of (D) a polyorganosilicate resin;
• >0.4 weight % to 20 weight %, based on combined weights of starting materials (A) to (G), of (E) a polyfluoropolyether silane;
• 0.01 weight % to 5 weight %, based on combined weights of starting materials (A) to (G), of (F) an anchorage additive;
• 0.01 weight % to 5 weight %, based on combined weights of starting materials (A) to (G), of (G) a hydrosilylation reaction catalyst inhibitor;
• and
• 0 to 90 weight %, based on combined weights of all starting materials in the composition, of (H) a solvent.