Cellulose acetate, cellulose acetate composition, molded article, and film

Patent metadata

Field	Value
Publication number	US-11440973-B2
Application number	US-201816480515-A
Country	US
Kind code	B2
Filing date	Jan 17, 2018
Priority date	Jan 25, 2017
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

The purpose of the present invention is to provide cellulose acetate with which it is possible to obtain a molded article containing cellulose acetate having a small amount of lumps. The cellulose acetate has an acetylation degree of 52% or more and 59% or less, and an acetone-insoluble substance content of 0.04 wt % or less.

First claim

The invention claimed is:

1. A cellulose acetate having an acetylation degree of 52% or more and 59% or less, and an acetone-insoluble substance content of 0.04 wt % or less,
wherein the cellulose acetate has a ratio of a molar content of glucose to a sum of molar contents of glucose, xylose and mannose is 98.0% or more in sugar composition analysis,
when the acetone-insoluble substance content is measured by steps of:
dissolving cellulose acetate in acetone at a solid concentration of 3 wt % to obtain a solution;
filtering the solution by suction filtration at room temperature of 25° C. under a reduced pressure of 30 mmHg using a glass filter having a pore diameter of 5 to 10 μm to obtain filtration residue;
washing a dope adhering to the filtration residue with acetone;
drying the filtration residue and the glass filter,
wherein the glass filter is weighed before and after filtering,
wherein the acetone-insoluble substance content is calculated as:
acetone-insoluble substance content (wt %)=[weight of glass filter after filtration (g)−weight of filter before filtration (g)]/weight of cellulose acetate (g)×100.

2. The cellulose acetate according to claim 1 , wherein a viscosity of the cellulose acetate at 6 wt % cellulose acetate per volume of acetone solution is 30 mPa·s or more and 200 mPa·s or less.

3. A cellulose acetate composition comprising the cellulose acetate according to claim 1 or 2 and a plasticizer.

4. A molded article comprising the cellulose acetate according to claim 1 or 2 .

5. A film comprising the cellulose acetate according to claim 1 or 2 .

Assignees

• Daicel Corp

Inventors

• Ashida Yuya
• Suzuki Ikuhiro
• Higuchi Akihiro

Classifications

• C08B3/06 Primary

  Cellulose acetate {, e.g. mono-acetate, di-acetate or tri-acetate} · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08L1/12

  Cellulose acetate · CPC title

• C08J2301/12

  Cellulose acetate · CPC title

• C08K5/00

  Use of organic ingredients · CPC title