Cellulose ester and molded article thereof

Patent metadata

Field	Value
Publication number	US-10927190-B2
Application number	US-201716091951-A
Country	US
Kind code	B2
Filing date	Apr 4, 2017
Priority date	Apr 8, 2016
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A cellulose ester, wherein, in a structural formula of the following general formula (I), a degree of substitution where X is an acyl group is from 2.91 to 3.0; the acyl group includes benzoyl group (A) optionally having a substituent, and benzoyl group (B) optionally having a substituent different from that of benzoyl group (A); and when the degree of substitution is 3.0, a degree of substitution of benzoyl group (A) is from 1.5 to 2.9, and a degree of substitution of benzoyl group (B) is from 0.1 to 1.5,

wherein all or some of X represents an acyl group; when some of X represents an acyl group, the remainder represents a group selected from a hydrogen atom and an alkyl group; and n represents an integer of from 20 to 20,000.

First claim

The invention claimed is:

1. A cellulose ester represented by a structural formula of the following general formula (I), wherein:
a degree of substitution where X is an acyl group is from 2.91 to 3.0;
the acyl group comprises a benzoyl group (A) not having a substituent, and a benzoyl group (B) having a substituent; and
when the degree of substitution is 3.0, a degree of substitution of the benzoyl group (A) not having a substituent is from 1.5 to 2.9, and a degree of substitution of the benzoyl group (B) having a substituent is from 0.1 to 1.5,

wherein all or some of X represents an acyl group; when some of X represents an acyl group, the remainder represents a group selected from a hydrogen atom and an alkyl group; and n represents an integer of from 20 to 20,000,
wherein the benzoyl group (B) is selected from a p-methylbenzoyl group, an o-methylbenzoyl group, a p-methoxybenzoyl group, an o-methoxybenzoyl group, and a dimethylbenzoyl group.

2. A molded article comprising the cellulose ester according to claim 1 .

3. A molded article comprising the cellulose ester according to claim 1 , wherein the molded article is selected from a semipermeable membrane, a sheet, an expanded sheet, a tray, a pipe, a film, a fiber, a nonwoven fabric, and a container including a bag.

Assignees

• Daicel Corp

Inventors

• Hashizume Tomohiro
• Matsumura Hiroyuki
• Shibata Tohru
• Koyama Hiroshi
• Ohno Mitsuru
• WATABE Tomoichi

Classifications

• B01D71/14

  Esters of organic acids · CPC title

• C08B3/08 Primary

  of monobasic organic acids with three or more carbon atoms, {e.g. propionate or butyrate} · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• B01D71/18

  Mixed esters, e.g. cellulose acetate-butyrate · CPC title

• C08B3/16 Primary

  Preparation of mixed organic cellulose esters {, e.g. cellulose aceto-formate or cellulose aceto-propionate} · CPC title