formed which could be blown into clear bottles poly ethylene terephthalate 1000 gms having an intrinsic viscosity of 0 67 dl g and a moisture content below 0 02 pyromellitic dianhydride 5 0 gms and ethylene bis stearamide 10 0 grams were mixed and melt blended in a 1 inch extruder at 260 u00b0 275 u00b0 c the extrudate was in the form of a clear molten hollow tube that was blow molded into a clear 4 oz bottle there was no evidence of parison sag or capacity even when the molten tube was 12 to 16 inches in length the walls of the bottles had an intrinsic viscosity of 0 84 dl g and were found to be completely amorphous by dsc measurements the bottle mold temperature was about 10 u00b0 c and the dwell time in the mold was 30 to 40 seconds the parison or molten hollow tube exhibiting only moderate die swell and no die lip sticking was produced at a smooth steady rate allowing continuous production of the bottles no additional cooling was required to achieve clear bottles other than the tap water cooled mold the air pressure for the blow molding operation was about 90 psig the bottles had properties characteristic of amorphous unoriented poly ethylene terephthalate tensile.