	US 12,331,229 B2
	Silicone adhesive composition and methods for its preparation and use for electronic device fabrication
Gunn Jo, Chungcheongbuk-do (KR)
Assigned to Dow Silicones Corporation, Midland, MI (US)
Appl. No. 17/911,707
Filed by Dow Silicones Corporation, Midland, MI (US)
PCT Filed Mar. 24, 2021, PCT No. PCT/US2021/023865 § 371(c)(1), (2) Date Sep. 15, 2022, PCT Pub. No. WO2021/236229, PCT Pub. Date Nov. 25, 2021.
Claims priority of provisional application 63/026,789, filed on May 19, 2020.
Prior Publication US 2023/0313008 A1, Oct. 5, 2023
Int. Cl. C09J 183/06 (2006.01); G06V 40/13 (2022.01); H10K 77/10 (2023.01)

CPC C09J 183/06 (2013.01) [G06V 40/13 (2022.01); H10K 77/10 (2023.02)]

15 Claims

1. A silicone adhesive composition comprising:

100 parts by weight of (A) a bis-vinyl-terminated polydiorganosiloxane polymer comprising unit formula:

(R^M₂R^USiO_1/2)_x(R^M₃SiO_1/2)_y(R^MR^USiO_2/2)_z(R^M₂SiO_2/2)_w,

where each R^Mis an independently selected monovalent hydrocarbon group of 1 to 30 carbon atoms that is free of aliphatic unsaturation; each R^Uis a group of formula CH₂═CH-D-, where each D is a covalent bond or an independently selected divalent hydrocarbon group of 1 to 28 carbon atoms; subscripts w, x, y, and z have values such that x≥0, y≥0, (x+y)=2, z≥0, and w≥0, a quantity (x+z) >0, and a quantity (z+w) is sufficient to give the polydiorganosiloxane polymer a number average molecular weight of 10,000 g/mol to 300,000 g/mol;

5 to 20 parts by weight of (B) a polydiorganosiloxane gum comprising unit formula:

(R^M₂XSiO_1/2)_g(R^M₂R^USiO_1/2)_a(R^M₂SiO_2/2)_b(R^MR^USiO_2/2)_c(R^M₃SiO_1/2)_d,

where R^Mand R^Uare as described above, X is a hydroxyl group, and subscripts g, a, b, c, and d have values such that 0≤g≤2, 0≤a≤2, 0≤d≤2, a quantity (g+a+d)=2, b≥0, c>0, a quantity (b+c) has a value sufficient to give the gum a number average molecular weight ≥500,000 g/mol, and where c has a value sufficient to provide the polydiorganosiloxane gum with a vinyl content ≥0.1 weight % based on weight of the gum, where vinyl content of starting material (B) refers to the amount of groups of formula (CH₂═CH—) bonded to carbon and/or silicon atoms in starting material (B);

(C) a polyorganohydrogensiloxane crosslinker, in an amount sufficient to provide an SiH/Vi ratio of >0.3, where SiH/Vi ratio is defined as the molar amount of silicon bonded hydrogen atoms in starting material (C) divided by the molar amount of groups of formula (CH₂═CH—) bonded to carbon and/or silicon atoms in in starting materials (A) and (B) combined; and

(D) a (η-cyclopentadienyl)tri(σ-aliphatic)-platinum complex, in an amount sufficient to provide 1 to 20 ppm Pt based on combined weights of all starting materials in the composition.