g of odm 130 9 g of diethyl phthalate 100 9 g of surfadone u00ae lp 300 20 7 g of es 40 g of neta 570 3 g of levapren u00ae 600 hv and 10 1 g of pvp va s 630 a vinyl acetate n vinyl 2 pyrrolidone copolymer containing 40 by weight of vinyl acetate marketed by gaf corporation are introduced into a reactor at 75 u00b0 c and the whole is stirred for 5 minutes 989 9 g of ethyl acetate and 10 1 g of ethanol are then incorporated the whole is stirred still at 75 u00b0 c until the eva copolymer has completely dissolved and the mixture obtained is allowed to degas it is coated onto a temporary siliconized polyester carrier at a temperature of 50 u00b0 c so as to form a deposit of 100 u00b1 10 g m 2 the coated product is then placed in a drying tunnel at a temperature varying from 60 to 80 u00b0 c in order to evaporate the solvents and the resulting matrix is transferred to a final polyester carrier after cutting to the desired size the products are packaged in heat sealable sachets 201 4 g of diethyl.