| 摘要 |
A silicone compsn. crosslinkable to an adhesive gel by hydrosilation contains a polyorganosiloxane POS (I) comprising (i) terminal siloxyl units of the type M = (R)-2(Frh)SiO1/2 and (ii) siloxyl units of the type D = (R<1>)p(Frh)qSiO2/2, a polyorganosiloxane POS (II) comprising (i) terminal siloxyl units M = (Frh)s(R<2>)tSiO1/2 and (ii) siloxyl units D = (Frh)u(R<3>)vSiO2/2, where at least one of the units D in POS (II) has Frh where u = v = 1, an extender polyorganosiloxane POS(II) comprising (i) terminal siloxyl units M = (Frh)w(R<4>)xSiO1/2, where the Frh units of (III) react with the Frh of the M units in POS(I), and the ratio r1 = number of Frh in POS (III) / number of Frh in POS (II) + POS (III) x 100 is below 80% (0.5-30%), and (ii) siloxyl units D = (R<5>)2SiO2/2, (IV) opt. a polyorganosiloxane POS (IV) used as diluent for POS (I) and with terminal siloxyl units M = (R<6>)3SiO1/2 and siloxyl units D = (R<7>)2SiO2/2, and (V) a hydrosilation catalyst, pref. of the Pt type. R = 1-6C alkyl and/or (substd.) aryl; Frh = a reactive hydrosilation-hydrogen or alkenyl-vinyl function forming part of the pref. alkenyls; R<1>, R<2>, R<3>, R<4>, R<5>, R<6>, R<7> are defined as R; p = 1 or 2; q = 0 or 1; p + q = 2; s, t = 0-3; s + t = 3; u, v = 0-2; u + v = 2; w = 1-3; x = 0-2; w + x = 3. |
