Patent ID: 6852854

Claim:
A carboxylated active ester comprising: a tertiary amine where said tertiary amine is cyclic having the general formula: (R 1 ) 1 (—(CH 2 ) n —NR 2 —) x-2 —(CH 2 ) n —NR 3 —) 1 where n is 2 or 3; x is 6 and R 1 is ((CH 2 ) n —NR 2 —) R 2 is a substituent that includes a carboxylic acid group having the general formula: H—O—(C═O)—(Y) m — where n is between 1 and 20, and Y is a branched or linear organic substituent, R 3 is a substituent that includes an ester group and at least one carbon atom in R 3 is attached to any one Nitrogen atom in the tertiary amine and said at least one carbon atom is between said one Nitrogen atom and said ester group, and said R 2 is attached to remaining Nitrogen atoms of said tertiary amine.