NEW SILICON COMPOUNDS WITH STERICALLY HINDERED CYCNEW SILICON COMPOUNDS WITH STERICALLY HINDERED CYCLIC AMINE FUNCTIONS USEFUL FOR THE LIGHT AND HEAT LIC AMINE FUNCTIONS USEFUL FOR THE LIGHT AND HEAT STABILIZATION OF POLYMERS STABILIZATION OF POLYMERS

摘要

The present invention relates to linear, cyclic or branched polyorganosiloxanes having per molecule at least 3 siloxyl patterns of which at least one is a functional pattern having formula (I), wherein R<1> is a C1-C4 alkyl radical or phenyl; X is a monovalent group containing one or a plurality of cyclic amines having formula (II), wherein R is a hydrocarbon group, U is -O- or -NR'- with R' being H or a hydrocarbon group, Z is a tetraalkyl-2,2,6,6 piperidinyl group, x = 0 and 1; y = 0, 1 and 2; z = 1, 2 and 3; y +z = 3; and a is 0, 1 and 2. The present invention also relates to the utilization of such polyorganosiloxanes in polymers to improve particularly their photostabilization.