Dual cure adhesive composition and methods for its preparation and use

An adhesive composition comprising:

• A) a poly(meth)acrylate clustered functional polyorganosiloxane comprising units of formulae:
• (R2R1SiO1/2)aa(RR1SiO2/2)bb(R2SiO2/2)cc(RSiO3/2)dd(RSiO3/2)dd(SiO4/2)ee((Rff)O(3-ff)/2SiD1SiRffO(3-ff)/2)gg, where each D1 independently represents a divalent hydrocarbon group of 2 to 18 carbon atoms;
• each R independently represents a monovalent hydrocarbon group of 1 to 18 carbon atoms or a monovalent halogenated hydrocarbon group of 1 to 18 carbon atoms, each R1 independently represents a methacryl-functional alkyl group or an acryl-functional alkyl group, subscript aa≥0, subscript bb≥0, a quantity (aa+bb)≥4, subscript cc>0, subscript dd≥0, subscript ee≥0, subscript ff is 0, 1, or 2, subscript gg≥2;
• B) a poly-alkoxy endblocked resin-polymer blend comprising a reaction product of
• i) a siloxane resin comprising units of formulae (R2′3SiO1/2) and (SiO4/2), where each R2′ is independently a monovalent hydrocarbon group, with the proviso that at least one R2′ per molecule has terminal aliphatic unsaturation, where the siloxane resin has a molar ratio of (R2′3SiO1/2) units to (SiO4/2) units ranging from 0.5:1 to 1.5:1,
• ii) a polydiorganosiloxane comprising units of formulae (R2′3SiO1/2)ii and (R2SiO2/2)hh, where R2′ is as described above, subscript hh is 20 to 1000 and subscript ii has an average value of 2;
• iii) an alkoxy-functional organohydrogensiloxane oligomer, wherein the alkoxy-functional organohydrogensiloxane oligomer comprises one or more of
• formula (V)
• where subscript a is 0 or a positive number, subscript c is 0 or 1, each R independently represents a monovalent hydrocarbon group of 1 to 18 carbon atoms or a monovalent halogenated hydrocarbon group of 1 to 18 carbon atoms, each R3 is independently a monovalent hydrocarbon group of 1 to 8 carbon atoms, and D is a divalent hydrocarbon group of 2 to 18 carbon atoms, with the proviso that >90 mol % of D are linear divalent hydrocarbon groups;
• formula (VIII)
• where subscript c is 0 or 1, each R independently represents a monovalent hydrocarbon group of 1 to 18 carbon atoms or a monovalent halogenated hydrocarbon group of 1 to 18 carbon atoms, each R3 is independently a monovalent hydrocarbon group of 1 to 8 carbon atoms, and D is a divalent hydrocarbon group of 2 to 18 carbon atoms, with the proviso that >90 mol % of D are linear divalent hydrocarbon groups;
• formula (XI)
• where subscript c is 0 or 1, each R independently represents a monovalent hydrocarbon group of 1 to 18 carbon atoms or a monovalent halogenated hydrocarbon group of 1 to 18 carbon atoms, each R3 is independently a monovalent hydrocarbon group of 1 to 8 carbon atoms, and D is a divalent hydrocarbon group of 2 to 18 carbon atoms, with the proviso that >90 mol % of D are linear divalent hydrocarbon groups;
• formula (XII)
• where subscript c is 0 or 1, each R independently represents a monovalent hydrocarbon group of 1 to 18 carbon atoms or a monovalent halogenated hydrocarbon group of 1 to 18 carbon atoms, each R3 is independently a monovalent hydrocarbon group of 1 to 8 carbon atoms, and D is a divalent hydrocarbon group of 2 to 18 carbon atoms, with the proviso that >90 mol % of D are linear divalent hydrocarbon groups;
• and
• unit formula (R2SiO2/2)v(RHSiO2/2)t
• where subscript c is 0 or 1, subscript v is 0 to 14, subscript t is 0 or more, subscript u is 1 or more, t+u is at least 3, each R independently represents a monovalent hydrocarbon group of 1 to 18 carbon atoms or a monovalent halogenated hydrocarbon group of 1 to 18 carbon atoms, each R3 is independently a monovalent hydrocarbon group of 1 to 8 carbon atoms, and D is a divalent hydrocarbon group of 2 to 18 carbon atoms, with the proviso that >90 mol % of D are linear divalent hydrocarbon groups;
• and
• iv) a selective hydrosilylation reaction catalyst;
• C) a condensation reaction catalyst;
• and
• D) a free radical initiator.