a more preferred embodiment one of x 1 and x 2 is s and the other is h r u2032 is an ethylene group r 1 and r 2 independently represent methyl r 3 and r 4 together with the nitrogen atoms attached thereto form a in another preferred embodiment one of x 1 and x 2 is n and the other is h and the sum of n 1 n 2 preferably is 6 in a more preferred embodiment one of x 1 and x 2 is n and the other is h r u2032 is an ethylene group r 1 and r 2 independently represent methyl r 3 and r 4 together with the nitrogen atoms attached thereto form a group r 5 is h m is 5 and n 1 n 2 6 the compound of formula i can be prepared by a process comprising the step of reacting a compound of formula ii with a lactone compound of formula iii r 1 r 2 r 3 r 4 and r 5 are the same as those defined for formula i set forth above with the proviso that when both x 1 and x 2 are not h x 1 x 2 and s is 1 and when x 1 or x 2 is h s is x concerning the compound of formula ii it can be prepared according to methodologies known in the art e g the synthesis procedures disclosed in the prior art references cited above including luigi angiolini et al journal of applied polymer science 1995 55 1477 1488 u s pat nos 4 582 862 us 5 145 885 us 5 506 279 us 5 837 746 wo 96 20795 and.