CELLULOSE ACETATE EXCELLENT IN PHYSICAL STRENGTH, AND PRODUCTION THEREOF

Japanese Patent JP3942669

B2

PROBLEM TO BE SOLVED: To obtain a low-crystalline cellulose acetate with both average acetylation degree and viscosity-average polymerization degree at respective specific levels or higher, low in heat of generation when crystallized, excellent in moldability, capable of providing molded products of improved physical properties, esp. films of improved mechanical strength and flexiblity.
SOLUTION: This low-crystalline cellulose acetate has the following characteristics: average acetylation degree: ≥59%; viscosity-average molecular weight (DP): ≥290; the relationship between DP and the concentrated solution viscosity [η] determined by falling ball viscometry satisfy formula I (esp. pref. formula II); and heat of generation under crystallization from its molten state (ΔHcr): 5-16J/g. This cellulose acetate is obtained, for example, by activation treatment of cellulose with e.g. acetic acid followed by reaction of the cellulose with acetic anhydride to prepare cellulose triacetate which is then saponified to regulate the acetylation degree of the triacetate. In the reaction, it is preferable to use 10-15 pts.wt. of sulfuric acid as catalyst based on 100 pts.wt. of the original cellulose.

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JP2010235904	CELLULOSE RESIN COMPOSITION FOR MELTING MOLDING, MOLDED BODY AND CASING FOR ELECTRIC AND ELECTRONIC EQUIPMENT

Kiyose Atsunobu
Shu Shimamoto
Yuichiro Suto
Hiroki Taniguchi

JP6260396A

July 11, 2007

March 19, 1996

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Daicel Chemical Industry Co., Ltd.

C08B3/06; C08J5/18; C08L1/12; (IPC1-7): C08B3/06; //C08J5/18; C08L1:00

JP5239101A
JP9095538A
JP9095544A
JP9095557A

Kaoru Furuya
Takahiko Mizobe
Satoshi Furuya
Shinji Mochida

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