US 12,466,982 B2
Silicone pressure sensitive adhesive composition containing a polyfluoropolyether silane additive and methods for the preparation and use of said composition
Jingui Jiang, Shanghai (CN); Jiayin Zhu, Shanghai (CN); Chengrong Zhu, Shanghai (CN); Zhihua Liu, Shanghai (CN); Qing Cao, Shanghai (CN); and Yan Zhou, Shanghai (CN)
Assigned to Dow Silicones Corporation, Midland, MI (US)
Appl. No. 18/552,309
Filed by Dow Silicones Corporation, Midland, MI (US)
PCT Filed Jun. 16, 2021, PCT No. PCT/CN2021/100321
§ 371(c)(1), (2) Date Sep. 25, 2023,
PCT Pub. No. WO2022/261853, PCT Pub. Date Dec. 22, 2022.
Prior Publication US 2024/0174904 A1, May 30, 2024
Int. Cl. C09J 7/38 (2018.01); C08G 77/08 (2006.01); C08G 77/12 (2006.01); C08G 77/20 (2006.01); C08K 5/5435 (2006.01); C09J 183/04 (2006.01)
CPC C09J 183/04 (2013.01) [C08G 77/08 (2013.01); C08G 77/12 (2013.01); C08G 77/20 (2013.01); C08K 5/5435 (2013.01); C09J 7/38 (2018.01); C09J 2301/302 (2020.08); C09J 2483/00 (2013.01); Y10T 428/28 (2015.01); Y10T 428/2852 (2015.01)] 15 Claims
 
1. A silicone pressure sensitive adhesive composition comprising:
30 weight % to less than 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)a(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 the starting material (B) is present in a sufficient amount to provide a molar ratio of silicon bonded hydrogen atoms to alkenyl groups in the 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 the starting materials (A) to (G), of (D) a polyorganosilicate resin;
>0.4 weight % to 20 weight %, based on combined weights of the starting materials (A) to (G), of (E) a polyfluoropolyether silane;
0.01 weight % to 5 weight %, based on combined weights of the starting materials (A) to (G), of (F) an anchorage additive;
0.01 weight % to 5 weight %, based on combined weights of the 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.