Title:
CELLULOSE ACETATE AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/195803
Kind Code:
A1
Abstract:
This cellulose acetate has a dope foreign matter area proportion of not more than 1.0% as measured by the following method. (Dope foreign matter area proportion measuring method) A cellulose acetate solution (dope) is created by fully dissolving 7.4 g of a dried cellulose acetate (sample) in 37.8 g of dichloromethane/methanol (weight ratio 9:1), and degassing the solution for at least 2 hours. Next, an LED light adjusted to have a 20 cm-illuminance of 1,000 lx is set to a polarization microscope, and an image of a cellulose acetate solution in a cross Nicol state of being sandwiched by two polarizing plates is acquired. The acquired image is converted into black and white, a foreign matter area of a randomly selected region is measured, and a dope foreign matter area proportion is calculated in accordance with the following formula by using the total area of the selected region as a background area. Dope foreign matter area proportion (%) = foreign matter area (cm2) / background area (cm2)×100
Inventors:
OYAMADA NAOHIRO (JP)
HOSAKA MITSUTERU (JP)
HOSAKA MITSUTERU (JP)
Application Number:
PCT/JP2021/011086
Publication Date:
September 22, 2022
Filing Date:
March 18, 2021
Export Citation:
Assignee:
DAICEL CORP (JP)
International Classes:
C08B3/06
Domestic Patent References:
| WO2016076058A1 | 2016-05-19 |
Foreign References:
| JP2008221564A | 2008-09-25 | |||
| JP2004155191A | 2004-06-03 | |||
| JP2018030911A | 2018-03-01 | |||
| JP2008056768A | 2008-03-13 | |||
| JP2020139047A | 2020-09-03 | |||
| JP2005530865A | 2005-10-13 |
Attorney, Agent or Firm:
ARCO PATENT & TRADEMARK ATTORNEYS (JP)
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