Patent ID: 6562180
Filing Date: 2003-05-13
Classification: C08G,C08L

Abstract:
A crosslinkable adhesive silicone composition consisting essentially of the following constituents:(I) 1 to 80% by weight of at least one polyorganosiloxane containing, per molecule, at least two alkenyl groups linked to the silicon and having a viscosity of 10,000 mPaÂ·s; (II) 0.1 to 20% by weight of at least one polyorganosiloxane containing, per molecule, at least three hydrogen atoms linked to the silicon; (III) 0.0002 to 0.04% by weight of a catalytically effective amount of at least one platinum group metal catalyst; (IV) an adhesion promoter consisting essentially of a mixture of: (IV.1) 0.01 to 5% by weight of at least one alkoxylated organosilane containing, per molecule, at least one C2-C6 alkenyl group; (IV.2) 0.01 to 5% by weight of at least one organosilicon compound comprising at least one epoxy radical; and (IV.3) 0.01 to 3% by weight of at least one chelate of a metal M and/or a metal alkoxide of the formula: M(OJ)n, where n=valency of M and J=linear or branched C1-C8 alkyl, (V) 0 to 60% by weight of an inorganic filler, (VI) 0 to 0.5% by weight of at lest one crosslinking inhibitor, and (VII) 0 to 80% by weight of at least one polyorganosiloxane resin, bearing siloxy units Q and/or T and alkenyl groups; all percentages being based on the total weight of the constituents (I) to (VII) of the crosslinkable adhesive silicone composition, the composition exhibiting:a peeling force Fp (N/mm) greater than or equal to 0.25; a viscosity &eegr; (103 mPaÂ·s at 25Â° C.), immediately after mixing together all constituents, of greater than or equal to 50; a tear strength Rd (N/mm) after crosslinking, of greater than or equal to 6; and a Shore A hardness after crosslinking, of greater than or equal to 35.