Novel silicone compounds containing sterically hindered cyclic amine functional groups useful for optical and thermal stability of the polymer

摘要

The present invention relates to linear, cyclic or branched polyorganosiloxanes containing at least three siloxy units per molecule, comprising at least one functional unit of formula (I):;(R ¹ ) _a XSi (O) _{3-a / 2} (Ⅰ);[Wherein R ¹ represents a C ₁ -C ₄ alkyl or phenyl radical, X is a secondary or tertiary ring bonded to silicon via a Si—AC bond (where A is a residue containing a cyclic acetal group) Type amine functional groups]. More specifically, X represents a monovalent group of the formula (II):;[Wherein R ² is H or an alkyl radical; Z is an aliphatic property, such as, for example, a -CO-CH-CO- radical, or Aromatic trivalent radicals, such as radicals; R ³ to R ⁶ are alkyl, phenyl and / or benzyl radicals; R ⁷ is H or an alkyl, alkylcarbonyl, phenyl or benzyl radical; X is 0,1,2 or 3; And y is 0 or 1].;The invention also relates in particular to said polyorganosiloxanes in the polymers used to enhance their photostability.