Patent ID: 6743515
Filing Date: 2004-06-01
Classification: C08G,C08K,C08L,C09D,Y10T

Abstract:
A self-adhesive addition-crosslinking silicone composition, comprising(A) diorganopolysiloxane(s) of the general formula (1) R1aR2 bSiO(4âˆ’aâˆ’b)/2â€ƒâ€ƒ(1), â€ƒin which R1 is a hydroxyl radical or a monovalent, optionally halogen-substituted C1-20 hydrocarbon radical optionally containing O, N, S or P atoms and free of aliphatically unsaturated groups, 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 from 0.003 to 2, with the proviso that 1.52 are present per molecule, and that the viscosity of the diorganopolysiloxane(s) (A), determined at 25Â° C., is 1 mPaÂ·s to 40,000 PaÂ·s; (B) organohydrogenpolysiloxane(s) of the general formula (2) R3cR4dR5eHfSiO(4âˆ’câˆ’dâˆ’2eâˆ’f)/2â€ƒâ€ƒ(2) â€ƒin which R3 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 organohydrogenpolysiloxane(B) contains on average 3 to less than 20 SiH groups per molecule, 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) organosilicon compound(s) having epoxy groups and hydrolyzable groups of the general formula (3) R7gR8hR9iSiO(4âˆ’gâˆ’hâˆ’i)/2â€ƒâ€ƒ(3) â€ƒand/or their partial hydrolysis products, in which R7 is a hydrogen radical, a hydroxyl radical or an optionally halogen- or cyano-substituted, saturated monovalent C1-20 hydrocarbon radical optionally containing O, N, S or P atoms, R8 is an optionally halogen-substituted monovalent C2-20 hydrocarbon radical containing at least one epoxy group, optionally containing O, N, S or P atoms, R9 is a hydrolyzable, monovalent optionally halogen-substituted C1-20 hydrocarbon radical bonded to Si via an Siâ€”Oâ€”Câ€”, Siâ€”Oâ€”Nâ€” or Siâ€”Nâ€” link, optionally containing O, N, S or P, with the proviso that 4>g&gE;0, 4>h>0, 4>i>0, 4&gE;(h+i)>0 and 4&gE;(g+h+i); and (D) a hydrosilylation catalyst.