because of the significant thermal stability of the compounds of the present invention a number of processing methods can be employed including injection molding compression molding vacuum forming blow molding structural foam molding including conventional low pressure high pressure and expanding molding using either chemical or physical blowing agents extrusion including profile pipe wire and cable sheets and co extrusion co injection molding and thermoforming a representative compound of the invention which uses an analgesic anion as the biologically active anion namely acetylsalicylate is represented by the formula this compound combines the analgesic properties of acetylsalicylic acid also known as 34 aspirin 34 with the added properties of buffering flavor masking and controlled release the compound is quite insoluble at the ph of saliva but will dissolve in the stomach where the ph is markedly lower such an acetylsalicylate containing compound is best prepared when one of the metal elements is not magnesium as magnesium compounds can cause the acetylsalicylate ion to decompose to salicylic acid and acetic acid decreasing its effectiveness as an analgesic another representative compound of the invention which uses an analgesic anion 2 4 isobutylphenyl propionate is represented by the formula this new compound combines the analgesic properties of 2 4 isobutylphenyl propionic acid also known as ibuprofen with the advantages as discussed above for the aspirin containing compound other ibuprofen type drugs suitable as the biologically active anion in this manner can be found in u s pat no 4 722 938 which patent is hereby incorporated by reference.