公开(公告)号：DE69327286D1

公开(公告)日：2000-01-20

申请号：DE69327286

申请日：1993-09-13

Applicant: DAICEL CHEM

Inventor： SAKA SHIRO ,  MATSUMURA HIROYUKI ,  HABU NAOTO ,  KAINO YOSHIAKI ,  IWATA RYOUTA ,  ASAI TANEMI ,  SHIMAMOTO SHU

IPC: C08B3/06 ,  C08B3/00 ,  C08B3/22

Abstract: A fatty acid ester of cellulose excellent in transparency, filterability and spinnability in spite of its high content of mannose and xylose, wherein the total molar content of mannose and xylose accounts for at least 7% of that of glucose, mannose and xylose, and the amount of filtration satisfies a specified requirement. Such a fatty acid ester of cellulose is prepared by using a pulp having a low alpha -cellulose content as a raw material and a fatty acid corresponding to the ester as a diluent and adding an organic solvent in an amount of at least 10% by weight based on the diluent in any step during the preparation. In the preparation of cellulose diacetate, which is excellent in filterability and transparency, by the acetic acid process, the cellulose diacetate obtained by aging is dissolved in a solvent which can dissolve it and the resulting cellulose diacetate is recovered.

公开(公告)号：DE69327286T2

公开(公告)日：2000-05-11

申请号：DE69327286

申请日：1993-09-13

Applicant: DAICEL CHEM

Inventor： SAKA SHIRO ,  MATSUMURA HIROYUKI ,  HABU NAOTO ,  KAINO YOSHIAKI ,  IWATA RYOUTA ,  ASAI TANEMI ,  SHIMAMOTO SHU

IPC: C08B3/06 ,  C08B3/00 ,  C08B3/22

Abstract: A fatty acid ester of cellulose excellent in transparency, filterability and spinnability in spite of its high content of mannose and xylose, wherein the total molar content of mannose and xylose accounts for at least 7% of that of glucose, mannose and xylose, and the amount of filtration satisfies a specified requirement. Such a fatty acid ester of cellulose is prepared by using a pulp having a low alpha -cellulose content as a raw material and a fatty acid corresponding to the ester as a diluent and adding an organic solvent in an amount of at least 10% by weight based on the diluent in any step during the preparation. In the preparation of cellulose diacetate, which is excellent in filterability and transparency, by the acetic acid process, the cellulose diacetate obtained by aging is dissolved in a solvent which can dissolve it and the resulting cellulose diacetate is recovered.