Title:
CHEMICALLY MODIFIED CELLULOSE FIBER AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2019/003774
Kind Code:
A1
Abstract:
Provided is a sulfuric esterified cellulose fiber having a cellulose I-type crystal structure. This cellulose fiber is a chemically modified cellulose fiber which has a cellulose I-type crystal and in which some hydroxyl groups of the cellulose are substituted by a substituent represented by the formula (1), wherein the introduction amount of the substituent is 0.1-3.0 mmol per 1 g of the chemically modified cellulose fiber, and the average degree of polymerization is at least 350 (in formula (1), M represents a monovalent to trivalent cation). In the production of the chemically modified cellulose fiber, a cellulose fiber is treated with a sulfamic acid while maintaining the shape of the cellulose fiber, and thereby, sulfamine is reacted with cellulose microfibers constituting the cellulose fiber.
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Inventors:
KITANO YUKA (JP)
HASHIMOTO MASAYUKI (JP)
HASHIMOTO MASAYUKI (JP)
Application Number:
PCT/JP2018/020727
Publication Date:
January 03, 2019
Filing Date:
May 30, 2018
Export Citation:
Assignee:
DAI ICHI KOGYO SEIYAKU CO LTD (JP)
International Classes:
C08B5/14; D01F2/28; A61K8/73
Foreign References:
| US2511229A | 1950-06-13 | |||
| US6800754B1 | 2004-10-05 | |||
| JPS5653145A | 1981-05-12 | |||
| CN102863544A | 2013-01-09 | |||
| JP2007092034A | 2007-04-12 | |||
| JP2012526156W |
Other References:
PETROPAVLOVSKIY, G. A. ET AL.: "[Effect of preliminary crosslinking on sulfation reaction of cellulose]", ZHURNAL PRIKLADNOI KHIMII , vol. 58, no. 2, 1985, pages 421 - 423, XP009517518
See also references of EP 3647326A4
See also references of EP 3647326A4
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