公开(公告)号：EP0763544B1

公开(公告)日：2003-09-24

申请号：EP96907722.1

申请日：1996-03-29

申请人： DAICEL CHEMICAL INDUSTRIES, LTD.

发明人： MURAKAMI, Ko ,  OKANO, Toshinori ,  TANIGUCHI, Hiroki ,  KIYOSE, Atsunobu ,  SHIMAMOTO, Shu

IPC分类号： C08B3/06 ,  C08B3/22

CPC分类号： C08L1/12 ,  C08B3/06 ,  C08B3/22 ,  C08L2666/02

公开(公告)号：EP0763544A1

公开(公告)日：1997-03-19

申请号：EP96907722.1

申请日：1996-03-29

申请人： DAICEL CHEMICAL INDUSTRIES, LTD.

发明人： MURAKAMI, Ko ,  OKANO, Toshinori ,  TANIGUCHI, Hiroki ,  KIYOSE, Atsunobu ,  SHIMAMOTO, Shu

IPC分类号： C08B3/06

CPC分类号： C08L1/12 ,  C08B3/06 ,  C08B3/22 ,  C08L2666/02

摘要： Cellulose acetate of high moldability with low solution viscosity in spite of high average degree of polymerization is obtained.
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.).