CELLULOSE ACETATE HAVING HIGH MOLDABILITY AND PRODUCTION THEREOF

Japanese Patent JP3957792

B2

PROBLEM TO BE SOLVED: To obtain a cellulose acetate having a low degree of polymn., a specified average degree of acetylation, a specified viscosity-average degree of polymn., a low crystallinity and an excellent moldability by adding a specified weight range of a sulfuric acid catalyst to cellulose.
SOLUTION: A cellulose acetate(CA) of the formula, which has an average degree of acetylation of at least 58.0%, a viscosity-average degree of polymn.(DP) of 200 to 290 and a conc. solution viscosity (&EEgr ) determined from the DP by the falling-ball viscosity determination method of the formula, is produced. CA is capable of forming moldings having improved properties, particularly film strength, and an increased flexibility, and it generates a low heat of crystallization and has a low crystallinity and an excellent moldabiity. Since CA has a high solubility in a solvent and a high moldability, while it has a high average degree of polymn. and a high average degree of substitution, moldings having a high moisture resistance and a high dimensional accuracy can be obtained from a CA solution of a low solution viscosity.

Hiroyuki Takemoto
Hiroshi Ogawa
Kiyose Atsunobu

JP20006296A

August 15, 2007

July 30, 1996

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Daicel Chemical Industry Co., Ltd.

C08B3/06; B01J27/02; C08J5/18; C08L1/12; (IPC1-7): C08B3/06; B01J27/02

JP9040792A
JP9095544A
JP9095557A
JP9095538A
JP9157303A
JP9157302A
JP9188701A
JP8337601A

12093の化学商品,化学工業日報社,1993年,第889-892頁
木材化学 上,1968年,第180-189頁

Kaoru Furuya
Takahiko Mizobe
Satoshi Furuya
Shinji Mochida

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