| 摘要 |
<p>Multifunctionalised polyorganosiloxanes including, per molecule, 'alpha' at least one functional siloxyl unit (I): (R)a Y Si (O) (3 - a)/2, wherein R is particularly a C1-6 alkyl radical, Y is a C1-15 alkoxyl radical and a is 0, 1 or 2; 'beta' at least one other functional siloxyl unit (II): (R)b W Si (O) (3 - b)/2, wherein W is a C2-30 hydrocarbon group connected to the silicon via a Si-C bond and selected from a ò C7 alkyl group; an alkenyl group; an unsaturated cycloaliphatic group; a mercaptoalkyl group; an alkyl group including a polysulphuric entity; and an alkyl group substituted by a ring with one or more sulphur atoms; and 'gamma' optionally at least one unit (III): (R)c (H)d Si (O) (4 - (c + d))/2, wherein c is 0, 1, 2 or 3, d is 0 or 1 and c + d o 3. The alkoxyl functionality Y is inserted onto a suitable polyhydrogenoorganosiloxane by means of a dehydrogenation/condensation reaction from the alcohol from which Y is derived. Then the functionality W is inserted by means of a hydrosilylation reaction from the olefin compound from which W is derived. Said multifunctionalised polyorganosiloxanes may be used as anti-adherence modulators in silicone compositions, and as a silica covering agent in loaded silicone compositions.</p> |
