| 摘要 |
Mixed polyorganosiloxanes having, per molecule, (i) at least one functional siloxyl unit (I): (R<1>)aXSi(O)(3-a)/2, wherein R<1> is a C1-4 alkyl radical or phenyl, X contains a secondary or tertiary cyclic amine function bound to the silicon via a -Si-A-C bond, where A is a hydrogen atom or a radical -CH2-CHR<2>-COO- (R<2> being a hydrogen atom or a C1-3 alkyl radical), and a is 0, 1 or 2; (2i) at least one other functional unit (II): (R<1>)bWSi(O)(3-b)/2, wherein W is a compatibilising function, particularly an alkyl radical having more than 10 carbon atoms, and b is 0, 1 or 2; and optionally (3i) at least one other unit (III): (R<1>)d (H)i Si(O)(4-(d + e))/2, wherein d is 0, 1, 2 or 3, e is 0 or 1, and the sum of d + e is no greater than 3. The use of such polyorganosiloxanes in polymers, in particular for improving the light-stability thereof, is also disclosed.
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