CELLULOSE ACETATE HAVING HIGH MOLDABILITY AND PROCESS FOR PREPARING THE SAME

Title:

CELLULOSE ACETATE HAVING HIGH MOLDABILITY AND PROCESS FOR PREPARING THE SAME

Document Type and Number:

WIPO Patent Application WO/1996/030413

Kind Code:

A1

Abstract:

A cellulose acetate which, despite the high average degree of polymerization, has a low solution viscosity and a high moldability.The low-molecular-weight fraction of cellulose acetate (such as CTA having an average degree of acetylation of 59.0 to 62.5 %) is eluted with a washing solvent to prepare cellulose acetate having a molecular weight distribution Mw/Mn of 1 to 1.7. The washing solvent may be any solvent capable of swellling or partially dissolving cellulose acetate, for example, a solvent capable of dissolving 0.1 to 30 % by weight of celllulose acetate. Examples of such solvents include ones having a solubility parameter 'delta' of 7 to 12.5 (such as ketones, ethers, organic acids, and esters).

Inventors:

MURAKAMI KO (JP)
OKANO TOSHINORI (JP)
TANIGUCHI HIROKI (JP)
KIYOSE ATSUNOBU (JP)
SHIMAMOTO SHU (JP)

Application Number:

PCT/JP1996/000862

Publication Date:

October 03, 1996

Filing Date:

March 29, 1996

Export Citation:

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Assignee:

DAICEL CHEM (JP)
MURAKAMI KO (JP)
OKANO TOSHINORI (JP)
TANIGUCHI HIROKI (JP)
KIYOSE ATSUNOBU (JP)
SHIMAMOTO SHU (JP)

International Classes:

C08B3/06; C08B3/22; C08L1/12; (IPC1-7): C08B3/06

Foreign References:

JPS59166501A

1984-09-19

Other References: