well optical qualities one of the processability measures is the natural draw ratio determined at 280 u00b0 f 138 u00b0 c another measure is the area under the yield stress curve lower area values and higher natural draw ratios indicate greater processibility optical properties were determined on samples stretched to an average thickness of 0 6 mils 15 u03bcm optical properties include haze transmittance and gloss haze and luminous transmittance were determined in accordance with astm d1003 in general lower haze films will have higher transmittance specular gloss was measured generally in accordance with astm d2457 astm d2457 refers to measurements at 20 45 and 65 degrees in addition specular gloss was measured at an angle of 85 degrees the invention is illustrated but not limited by the following examples a mini random polypropylene designated sunoco 2 1mf and available from sunoco chemicals was tested with and without a nucleation system this polypropylene was selected for its high isotacticity and 0 5 ethylene content typical of mini random polypropylene it has a melt flow index of 3 2 which is typical for mini random polypropylenes used in film production the nucleation system consisted of a blend of aliphatic dicarboxylic and monocarboxylic acids primarily adipic and stearic acids the ratio of stearic acid to adipic acid in this nucleation system was in accordance with the ratios of u s pat nos 5 300.