is a diradical derived from c 1 25 alkyl aryl or aryl c 1 6 alkyl 1 3 wherein from 1 4 of the ch 2 groups within the alkyl chain are optionally independently replaced by o or s atoms preferably by o atoms such that each of said o or s atoms is attached only to carbon atoms in the alkyl chain with the proviso that multiple heteroatoms must be separated from each other by at least two carbon atoms and from the diradical chain ends by at least one carbon atom or r is u2014 ch 2 ch 2 o u2014 p u2014 wherein p is an integer from about 10 to about 50 with the proviso that at least one of z is u2014 ch 2 u2014 o u2014 ch 2 u2014 as used herein for functionalized triclosan oligomers of formula viii when r is u2014 ch 2 ch 2 o u2014 p u2014 the two oxygen atoms in the moiety u201c o u2014 r u2014 o u201d are implicit in the r moiety for example the terminal oxygen atoms in the diradical u2014 o u2014 ch 2 ch 2 u2014 o u2014 ch 2 ch 2 u2014 o u2014 that is wherein r is u2014 ch 2 ch 2 o u2014 p u2014 and p is 2 form part of both the r and the two u201c o u201d atom functions.