CELLULOSE ESTER AND PROCESS FOR PRODUCTION THEREOF

Title:

CELLULOSE ESTER AND PROCESS FOR PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2006/033362

Kind Code:

A1

Abstract:

The invention provides a cellulose ester and a film which are useful in enhancing optical characteristics such as optical isotropy remarkably. A cellulose ester which has a total mean degree of substitution of 2.90 to 2.965, a sum total of mean degrees of substitution at the 2- and 3-positions of glucose units of 1.97 or above and a half width of compositional distribution of 0.09 or below in degree of substitution. This cellulose ester can be produced by a process for the production of cellulose ester which comprises the acylation step (i) of acylating cellulose with an acylating agent in the presence of a sulfuric acid catalyst and the aging step (ii) of aging the obtained product in the presence of a sulfuric acid catalyst, wherein the acylation in the acylation step (i) is conducted in the presence of 6.5 to 9.5 parts by weight of a sulfuric acid per 100 parts by weight of cellulose by the use of 1.40 to 2.0 molar equivalents of an acylating agent per mol of cellulosic hydroxyl.

Inventors:

SHIMAMOTO SHU (JP)
HIGUCHI AKIHIRO (JP)

Application Number:

PCT/JP2005/017403

Publication Date:

March 30, 2006

Filing Date:

September 21, 2005

Export Citation:

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Assignee:

DAICEL CHEM (JP)
SHIMAMOTO SHU (JP)
HIGUCHI AKIHIRO (JP)

International Classes:

C08B3/06; C08B3/00; C08B3/02; C08J5/18; G02B5/30

Foreign References:

JP2003201301A	2003-07-18
JPS59166501A	1984-09-19
JP2004002883A	2004-01-08
JPH1045804A	1998-02-17
JP2005154764A	2005-06-16

Other References: