Oxime-functional moisture-curable hot melt silicone pressure-sensitive adhesives

A moisture-curable silicone hot-melt adhesive composition is disclosed, which composition comprises (i) a solid hydroxyl-functional organopolysiloxane resin comprising R3SiO1/2 siloxane units and SiO4/2 siloxane units in a molar ratio of 0.5/1 to 1.2/1, wherein R is selected from hydrocarbon or halo...

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Bibliographische Detailangaben
Hauptverfasser: SCHOENHERR, WILLIAM JOSEPH, CIFUENTES, MARTIN ERIC, VINCENT, HAROLD LEWIS, BRADY, WILLIAM PATRICK, VINCENT, GARY ALLEN
Format: Patent
Sprache:eng ; fre ; ger
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Zusammenfassung:A moisture-curable silicone hot-melt adhesive composition is disclosed, which composition comprises (i) a solid hydroxyl-functional organopolysiloxane resin comprising R3SiO1/2 siloxane units and SiO4/2 siloxane units in a molar ratio of 0.5/1 to 1.2/1, wherein R is selected from hydrocarbon or halogenated hydrocarbon radicals; (ii) a diorganopolysiloxane polymer having silicon-bonded hydroxyl terminal groups and having a viscosity at 25 DEG C. of 100 to 500,000 mPa.s (centipoise), the weight ratio of said resin (i) to said polymer being (ii) in the range 40:60 to 75:25; (iii) a ketoximosilane, the amount of said ketoximosilane being sufficient to provide a molar ratio of X groups to total hydroxyl groups on said resin (i) and said diorganopolysiloxane (ii) of 0.9 to 3; and (iv) optionally, sufficient catalyst to accelerate the cure of said composition, said composition being an essentially solvent-free non-slump solid at room temperature, being extrudable at