| abstract |
(A) Formula (I) (wherein, R A is a hydrocarbon radical, optionally, -OH, -SH, -COOH, -NR '2, -COOR', - CONR ', - substituted with CHO R ′ is H or C 1-3 alkyl, and R A is selected such that the repeating unit of formula (I) is hydrophilic; and formula (II) (wherein , R B is a hydrocarbon group, optionally substituted with halogen, —OH, —SH, —COOH, —NR ″ 2 , —COOR ″, —CONR ″, —CHO, where R ″ is H, alkyl or alkenyl, R B is at least one copolymer comprising repeating units of the formula repeating units (II) is chosen such more hydrophobic than the repeating unit of formula (I)); ( b) a composition comprising one or more active agents. |