Patent ID: 6914139

Claim:
A solution of cellulose acylate dissolved in an essentially non-chlorinated solvent, wherein the essentially non-chlorinated solvent is a mixture of a ketone and an ester, said ketone having a solubility parameter of 19 to 21, said ester having a solubility parameter of 19 to 21, and said solution further containing a releasing agent, and wherein the releasing agent is a compound represented by the following formula (1) or (2): (R1-B1-O) n1 —P(═O)−(OM1) n2 (1) R2-B2-X (2) in which each of R1 and R2 is independently a non-substituted alkyl or alkenyl group having 8 to 40 carbon atoms; M1 is an alkali metal, an ammonium or a lower alkylamine; each of B1 and B2 is independently a divalent linking group selected from the group consisting of an alkylene group having 1 to 10 carbon atoms, a polyoxyethylene having polymerization degree of 1 to 50, a polyoxypropylene having polymerization degree of 1 to 50, a polyoxyglycerin having polymerization degree of 1 to 50, and a combination thereof; X is a sulfonic acid, a salt thereof, a sulfuric ester or a salt thereof; n1 is 1 or 2; and n2 is 3-n1.