TECHNOLOGY FOCUS - POLYMERS - Preferred Polymers: The polymers may be of formula (2), (3), or (4).Rp, Z, Mk+, m, and n = as abovePreferred Method: The method comprises polymerization of a polymerizable monomer in the presence of a metal salt, preferably lithium salt, in a solution in an organic solvent, and removing the solvent. The solution is cast on a support sheet, preferably a PTFE sheet, polymerization is carried out, and the solvent removed. Preferred Definitions:    Q = aryl group connected directly or through another group to Rp by single bond    Q = six-membered ring    another group between Rp and Q = amide group    Rp = residue of polystyrene    Rp = residue of a copolymer of an aryl compound and another compound    Z = connected to a carbon atom in a 6-membered ring, the carbon atom to which Z is connected being next to the single bond    Rp = residue of polystyrene, each of the groups (Q-(Z- - -Mk+)n)m is pendent from a styrene unit through an amide group    Z = hydroxy group or a methoxy group    Mk+ = lithium ion    EXAMPLE - Salicylic acid (232 g) and 1-hydroxybenzotriazole (283 g) were completely dissolved in a mixed solvent consisting of tetrahydrofuran (3 L) and N,N'-dimethylformamide (2.5 L), the solvent being dried by evaporation. The solution was stirred at room temperature for 30 minutes. The solution was cooled at 0 degrees C and 1-(3-(dimethylamino)-propyl)-3-ethyl carbodiimide (287 g) were dropped in the solution, followed by stirring at 0 degrees C for 30 minutes. To the solution were slowly dropped tetrahydrofuran (2 L) containing vinyl aniline (245 g) and cooled to 0 degrees C, followed by stirring the solution at room temperature for 2 days. The solution was condensed to extract an ethyl acetate phase from ethyl acetate and 2N hydrochloric acid (HCl). The extract was rinsed with HCl and saturated sodium chloride solution and dried with sodium sulfate, followed by condensation and purification to obtain a white powdery solid, N-(4-vinyl phenyl)-2-hydroxybenzoic amide.