Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR PRODUCING CELLULOSE ACETATE FLAKES
Document Type and Number:
WIPO Patent Application WO/2018/139319
Kind Code:
A1
Abstract:
An objective of the present inventions is to provide a cellulose acetate having exceptional transparency. This method for producing cellulose acetate flakes comprises: (a) a step in which acetic anhydride is reacted with cellulose in the presence of an acid catalyst and an acetic acid solvent, thereby generating a cellulose acetate dope; (b) a step in which the generated cellulose acetate is hydrolyzed and the acetylation degree is adjusted to 52-59%; (c) a step in which the adjusted cellulose acetate is settled out in the presence of water; (d) a step in which the cellulose acetate obtained by the settling out process is dispersed in a mixed solvent comprising a solvent having a solubility parameter δ of 8-13 and a solvent having a solubility parameter δ of at least 14, thereby forming a slurry; and (e) a step in which cellulose acetate is separated from the slurry and made into flakes. The mixed solvent contains 30-70wt% of the solvent having a solubility parameter δ of 8-13.

Inventors:
SUZUKI, Ikuhiro
ASHIDA, Yuya
HIGUCHI, Akihiro
Application Number:
JP2018/001232
Publication Date:
August 02, 2018
Filing Date:
January 17, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
DAICEL CORPORATION (3-1 Ofuka-cho, Kita-ku Osaka-sh, Osaka 11, 〒5300011, JP)
International Classes:
C08B3/06
Domestic Patent References:
WO2011093216A12011-08-04
Foreign References:
JPS5659801A1981-05-23
JPH06157601A1994-06-07
JPH06157602A1994-06-07
Other References:
MACROMOL SYMP., vol. 208, 2004, pages 49 - 60
J. D. WILSONR S. TABKE, TAPPI, vol. 57, 1974, pages 77
F. L. WELLSW. C. SHATTNERA. WALKER, TAPPI, vol. 46, 1963, pages 581
J.H. HILDEBRANDR. L SCOTT: "Solubility of Non-electrolytes", 1950, REIN HOLD
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (3rd Fl, Bo-eki Bldg. 123-1, Higashimachi, Chuo-ku, Kobe-sh, Hyogo 31, 〒6500031, JP)
Download PDF: