Patent ID: 8003224

Claim:
A method for producing a cellulose acylate composition, which comprises filtering a solution in which cellulose acylate satisfying the following formulae 1 to 3 and having melt viscosity of 150 to 1000 Pas at 230° C. is dissolved in a solvent through a filter having a retention particle size of 0.1 to 40 μm, and mixing the filtered solution with a poor solvent to reprecipitate cellulose acylate: 1.5.≦ A+B≦ 3 Formula 1 0≦A≦2.0 Formula 2 1.0≦B≦3 Formula 3 where A is a substitution degree for an acetyl group of a hydrogen atom which constitutes a hydroxyl group of cellulose, and B is a substitution degree for an acyl group having 3 to 7 carbon atoms of a hydrogen atom which constitutes a hydroxyl group of cellulose.