C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/218, 18/590,
C08B 1/08 (2006.01) C08B 1/00 (2006.01) C08B 16/00 (2006.01) C08L 1/00 (2006.01) C08L 1/02 (2006.01)
Patent
CA 1234105
- 33 - CELLULOSE DOPE, PROCESS FOR PREPARATION AND METHOD FOR APPLICATION THEREOF ABSTRACT OF THE DISCLOSURE Described is a cellulose dope which is an aqueous alkali solution containing substantially at least 3% by weight of cellulose having a degree of polymerization of at least 100, wherein in the 13C-NMR spectrum of the cellulose, the C4-position carbon peak is found at a magnetic field higher by at least 7 ppm than the magnetic field of the C4-position carbon peak of solid cellulose attributed to the strong intramolecular hydrogen bond. This dope is prepared by maintaining a mixture comprising 100 weight parts of cellulose, which may have any crystal form, and 10 to 1000 weight parts of a hydrogen bond. cleaving solution at 100°C to 350°C under a pressure of 10 to 250 atmospheres, promptly exposing the mixture to the ambient atmosphere, mixing the resulting cellulose with an aqueous alkali solution maintained at a tempera- ture not higher than 50°C, and then stirring the mixture at a temperature not higher than 10°C to dissolve the cellulose in the aqueous alkali solution. The dope may be used for the manufacture of a shaped article or for coating.
468821
Kamide Kenji
Okajima Kunihiko
Asahi Kasei Kogyo Kabushiki Kaisha
Ridout & Maybee Llp
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