| abstract |
Cellulose acetate of high moldability with low solution viscosity in spite of high average degree of polymerization is obtained. n Low molecular weight components of cellulose acetate (e.g., CTA having average degree of acetylation of 59.0 to 62.5 %) are eluted with a washing solvent to produce cellulose acetate having molecular weight distribution Mw/Mn of 1 to 1.7. As washing solvent, those swell or partially dissolve cellulose acetate, for example, those dissolve 0.1 to 30 % by weight of cellulose acetate can be used. Such solvent includes, for example, a solvent having solubility parameter δ of 7 to 12.5 (ketones, ethers, organic acid, esters, etc.). |