to about 20 weight percent of one or a mixture of other compatible polymers can be incorporated into the blends e g any of the polymers disclosed in general aniline amp film corporation technical bulletin 7583 033 the blends can be formed into a variety of shapes and if desired can be fabricated into foams employing known and conventional techniques including the use of chemical and or physical blowing agents the solid blends can also be extruded as fibers rods sheets and so forth many different types of additional materials can be incorporated into the polymer blends herein including organic and inorganic salts alcohols amines acids polymer latices resin or wax dispersions fillers fibers cellulosics surfactants pigments dyes fragrances and so forth the blends of this invention are especially useful as carriers for a wide variety of releasable materials including biologically active substances having curative or therapeutic value for human beings or non human animals included among the biologically active materials which are suitable for incorporation into the blends of the present invention are hypnotics sedatives tranquilizers anti convulsants muscle relaxants antiparkinson agents analgesics antipyretic agents antiinflamatory agents local anesthetics anti spasmodics antiulcer agents antivirals antibacterials antifungals antimalarials sympathomimetic agents cardiovascular agents diuretics antiparasitic agents antitumor agents and hypoglycemic agents and so forth in the form of a sheet or film or as a coating the blends can be combined with and.