CELLULOSE ACETATE AND PRODUCTION METHOD THEREFOR

WIPO Patent Application WO/2018/038051

A1

The purpose of the present invention is to provide a cellulose acetate which can be used to obtain an optical film containing a very small amount of bright-spot foreign matter, with superior production efficiency, even when a raw material of the cellulose acetate is a cellulose which contains a small amount of hemicellulose components and has a high degree of crystallinity. In the cellulose acetate, the content ratio by mole of mannose units to the sum of xylose units, mannose units, and glucose units, which are sugar-chain components, is 0.04 mol% or less, and the filtration index K thereof which is measured by a measurement method is 30 mL-1 or less. (Measurement method) The cellulose acetate is dissolved in a mixed solvent containing methylene chloride and methanol at a weight ratio of methylene chloride/methanol of 9/1, to obtain a 16-wt% (solid concentration) solution. The temperature of the solution is adjusted to 25°C, and the solution is subjected to constant-pressure filtration under a pressure of 3 kg/cm2 using a cloth filter obtained by stacking three sheets of calico (s618) (diameter: 15 mm, and filtration area: 1.77 cm2). At this moment, the filtration index K (mL-1) is calculated using formula 1, where P1 represents the amount of filtration (mL) up to 20 minutes after the start of filtration, and P2 represents the amount of filtration (mL) from zero to 60 minutes.

TSUDA MAIKO
HIGUCHI AKIHIRO

PCT/JP2017/029778

March 01, 2018

August 21, 2017

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DAICEL CORP (JP)

C08B3/06

WO2016009461A1

2016-01-21

JP2007217470A	2007-08-30
JP2008056768A	2008-03-13

PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)

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