초록

Oligomers of the formula [Figure] (I) which contain at least one piperidinyl moiety in the repeating unit are useful as light stabilizers for polymers.

대표청구항 ▼

An oligomer of the formula (I) [Figure] (I) wherein X and X1, which are the same or different, represent hydrogen, C1-C20 alkyl, or the radical (II) [Figure] (II) wherein R1 represents hydrogen, C2-C3 hydroxyalkyl, C1-C8 alkyl, hydroxyl, or oxyl; R2 represents hydrogen, C1-C8 alkyl, or benzyl; R3 an

An oligomer of the formula (I) [Figure] (I) wherein X and X1, which are the same or different, represent hydrogen, C1-C20 alkyl, or the radical (II) [Figure] (II) wherein R1 represents hydrogen, C2-C3 hydroxyalkyl, C1-C8 alkyl, hydroxyl, or oxyl; R2 represents hydrogen, C1-C8 alkyl, or benzyl; R3 and R4, which are the same or different, represent C1-C8 alkyl, benzyl, or phenethyl, or together with the carbon to which they are attached form a C5-C10 cycloalkyl; Z represents C2-C20 alkylene, either straight-chained or branched, wherein the alkylene chain is optionally interrupted by oxy, thio, or [Figure] radicals, wherein R5 represents hydrogen, C1-C20 alkyl, or the radical (II); C5-C10 cycloalkylene, [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] C6-C12 arylene, or C8-C14 aralkylene; n is an integer greater than 1; and, Y represents a halogen atom, C1-C8 alkylamino, di(C1-C8)alkylamino, pyrrolidyl, morpholino, or [Figure] wherein X, X1, and Z are as previously defined; with the proviso that at least one piperidinyl moiety of formula (II) is present in the repeating unit. A method for stabilizing a polymer which is normally subject to degradation by ultraviolet radiation which comprises incorporating into said polymer an ultra-violet stabilizingly effective amount of an oligomer of claim 1.