aqueous solution containing 28 weight percent acetic acid 29 34 g an aqueous solution containing 1 weight percent carbowax u00ae 8000 4 30 g and water 3562 91 g the autoclave agitator was set to 5 rpm and the contents were purged with nitrogen at 10 psi for 10 minutes the agitator was set to 50 rpm the pressure relief valve was set to 250 psig and the autoclave was heated to 225 u00b0 c the pressure reached 250 psig after about 60 minutes and was held there for another about 40 minutes until the temperature of the autoclave contents had reached 225 u00b0 c the temperature relief value was then set at 350 psig the pressure rose to 350 psig over about 15 minutes where it was held for about 85 minutes during this time the temperature of the autoclave contents rose to about 295 u00b0 c the pressure was then reduced to 0 psig over about 45 minutes during this time the temperature of the autoclave contents rose to 320 u00b0 c the autoclave was pressurized with about 50 psig nitrogen and the molten polymer was cast from the autoclave the collected polymer was cooled with steam and water and cut the ingredients used in example 2.