Patent ID: 6143042
Filing Date: 2000-11-07
Classification: C08J,H01M,Y02E,Y10T

Abstract:
In a method for forming a solid film comprising a polymer and plasticizer and then removing the plasticizer from said film, the improvement comprising:extracting said plasticizer from said film by contacting said film with an extraction solvent mixture comprising carbon dioxide and an organic polar co-solvent, said carbon dioxide, CO.sub.2, being in a solvent fluidic state at a temperature greater than or equal to 31.degree. C. and less than 35.degree. C., and at a pressure to maintain said fluidic state at said temperature, with said co-solvent present in an amount up to about 10 percent by weight of said extraction solvent mixture, and said co-solvent characterized by having a liquid state at said temperature and pressure.