Title:
CELLULOSE ACETATE AND MANUFACTURING METHOD OF CELLULOSE ACETATE
Document Type and Number:
Japanese Patent JP2021008565
Kind Code:
A
Abstract:
To provide low substituted cellulose acetate having biodegradability and susceptible to metabolically breakdown due to bacteria in intestines and its manufacturing method.SOLUTION: Cellulose acetate having a total degree of acetyl substitution of 0.4 or larger and 0.9 or smaller, a ratio of the acetyl substitution degree at 6-th site in the total degree of acetyl substitution of 0% or larger and 18% or smaller, and light transmittance at 660 nm of 4 wt.% aqueous solution of 5% or larger. A manufacturing method of the cellulose acetate comprises the steps of: deacetylating by subjecting solvolysis raw material cellulose acetate having the total substitution rate of acetyl of 1.5 to 3.0; and precipitating the cellulose acetate generated by deacetylation of the raw material cellulose acetate, in which the solvolysis of the raw material acetate cellulose proceeds at a temperature higher than a boiling temperature of the alcohol under the presence a solvent containing alcohol having three or smaller carbons and an acid catalyst.SELECTED DRAWING: None
Inventors:
YOSHIOKA SHUJI
NAKAMURA TOSHIKAZU
SHIMAMOTO SHU
KISHIMOTO TAKAO
NAKAMURA TOSHIKAZU
SHIMAMOTO SHU
KISHIMOTO TAKAO
Application Number:
JP2019122736A
Publication Date:
January 28, 2021
Filing Date:
July 01, 2019
Export Citation:
Assignee:
DAICEL CORP
UNIV TOYAMA PREFECTURAL
UNIV TOYAMA PREFECTURAL
International Classes:
C08B3/06; A61K31/717; A61P3/04; A61P3/06; C08B3/24; C08B3/28
Domestic Patent References:
| JPH05500684A | 1993-02-12 | |||
| JPS627701A | 1987-01-14 | |||
| JPS5834801A | 1983-03-01 |
Foreign References:
| WO2014142166A1 | 2014-09-18 | |||
| WO2018183467A1 | 2018-10-04 |
Other References:
BUCHANAN CHARLES M., ET AL.: "Preparation and Characterization of Cellulose Monoacetates: The Relationship between Structure and W", MACROMOLECULES, vol. 24, JPN6020028681, 1991, pages 3060 - 3064, XP000231259, ISSN: 0005033437, DOI: 10.1021/ma00011a005
TAKEDA NOBUKO, ET AL.: "Synthesis and enzymatic degradation of randomly substituted 2,3,6- O-cellulose acetate and regiosele", POLYMER DEGRADATION AND STABILITY, vol. 129, JPN6020028678, 2016, pages 125 - 132, XP029599490, ISSN: 0005033438, DOI: 10.1016/j.polymdegradstab.2016.04.008
TAKEDA NOBUKO, ET AL.: "Synthesis and enzymatic degradation of randomly substituted 2,3,6- O-cellulose acetate and regiosele", POLYMER DEGRADATION AND STABILITY, vol. 129, JPN6020028678, 2016, pages 125 - 132, XP029599490, ISSN: 0005033438, DOI: 10.1016/j.polymdegradstab.2016.04.008
Attorney, Agent or Firm:
Patent business corporation Yuko patent office