An apparatus for conveying printed products, includes a first accumulating section and at least one second accumulating section to convey the printed products from at least one intake area to at least one discharge area. 5 to 50 wt % crosslinker comprising at least two acrylamide groups; 20 to 65 wt % curable ionic compound comprising an ethylenically unsaturated group and an anionic group; 15 to 45 wt % solvent; and 0 to 10 wt % of free radical initiator; wherein the molar ratio of : is 0. The present invention also provides for the methods and kits for the delivery of liposomal compositions to the brain. In lieu of bonding the amino acid to the polymer, the amino acid can be chemically bonded to the therapeutic substance or both the substance and the polymer.