Flexibility of the film from this formulation may be controlled by addition of a plasticizer in amount equivalent to 10-25% of the PVP content. Suitable modifiers are: dimethyl phthalate, "Santicizer" E-15, glyceryl monoricinoleate, "Corol," "Dytol" L-79, diethylene glycol, and dipropylene glycol. the addition of water-insoluble plasticizers will aid in reducing tack.
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