Patent ID: 6489031
Filing Date: 2002-12-03
Classification: C08G,C08K,C08L,Y10T

Abstract:
A self-adhesive addition-crosslinking silicone composition comprising:(A) a diorganopolysiloxane of the general formula (1) R1aR2bSiO(4-a-b)/2â€ƒâ€ƒ(1), in whichR1 is a hydroxyl radical or a monovalent, optionally halogen-substituted C1-20 hydrocarbon radical free of aliphatically unsaturated groups, optionally containing O, N, S or P atoms, R2 is a monovalent, aliphatically unsaturated, optionally halogen-substituted C2-10 hydrocarbon radical optionally containing O, N, S or P atoms, b has a value of from 0.003 to 2, with the proviso that 1.52 are present on average per molecule, and that the viscosity of the diorganopolysiloxanes (A), determined at 25Â° C., is 1 mPaÂ·s to 40,000 PaÂ·s; (B) an organohydrogenpolysiloxane of the general formula (2) R3cR4dR5eHfSiO(4-c-d-2e-f)/2â€ƒâ€ƒ(2), in whichR3 is a monovalent aliphatically saturated C1-20 hydrocarbon radical, R4 is (a) an optionally halogen-substituted monovalent C6-15 hydrocarbon radical which contains at least one aromatic C6-ring, or (b) a halogen-substituted, saturated monovalent C2-20 hydrocarbon radical optionally containing O, N, S or P atoms, R5 is a bivalent, optionally halogen-substituted C6-20 hydrocarbon radical Si-bonded at both ends, optionally containing O, N, S or P atoms, c, d, e and f denote positive numbers, with the proviso that the relationship: 0.05<100 (d+e)/(c+d+e+f)<12 is fulfilled and that the viscosity of the organohydrogenpolysiloxane (B), determined at 25Â° C., is 1 mPaÂ·s to 100 PaÂ·s;(C) a compound containing at least one aliphatically unsaturated radical and at least one &bgr;-diketone or &bgr;-keto ester group, of the general formula (3): R7â€”COâ€”CHR8â€”COâ€”(O)gâ€”R9â€ƒâ€ƒ(3), whereR7 and R9 are each an identical or different (a) monovalent, aliphatically unsaturated, optionally halogen-substituted C2-12 hydrocarbon radical optionally containing O, N, S or P atoms, or (b) a monovalent aliphatically saturated C1-20 hydrocarbon radical, R8 is hydrogen, (a) a monovalent, aliphatically unsaturated, optionally halogen-substituted C2-12 hydrocarbon radical optionally containing O, N, S or P atoms, or (b) a monovalent aliphatically saturated C1-20 hydrocarbon radical, g is 0 or 1; and (D) a hydrosilylation catalyst.