| abstract |
A synthetic polyamide of formula (I) and its salts in which each R1 independently is selected from hydrogen, carboxyl, amino or a group of formula (α): -A1-R10 where A is a bridging group and R10 is a sterically hindered amine group; each R2 independently is hydrogen or a group of formula (α); A is a bridging group of formula (i) or (ii); n is 0 or 1; R3 is hydrogen, C1-12alkyl or is a significance of R10; R5 is hydrogen or C1-12alkyl; R4 is a significance of R10 or a group of formula (α); and p is an integer from 5 to 200; with the proviso that the compound of formula (I) contains 1-400 sterically hindered amine groups. |