| abstract |
Oligomeric polyester amides of the formula III where G is a group of the formula IV or V, EC 2 -C 12 alkylene, phenylene, 5-norbornene-2,3-diyl or -CH = CH - means, L- (CH 2 ) 2 -, - (CH 2 ) 3 - or -CH 2 -CH ( R 3 ) - means, n represents a value from 2 to 50, preferably from 2 to 10, and R ', R 2 , .R 3 , Z 1 and Z 2 have the meaning given in Claim 1, can be obtained by reacting an amino alcohol of formula I. with a dicarboxylic acid ester of the formula II in an approximate molar ratio of 1: 1. If two different dicarboxylic acid esters II are used, corresponding copolymers are obtained. The oligomeric products are light stabilizers for organic polymers. |