Production of low molecular weight ethylcellulose

Details Production of low molecular weight ethylcellulose Production of low molecular weight ethylcellulose

C - Chemistry, Metallurgy

08

B

C08B 11/02 (2006.01) C08B 11/20 (2006.01)

Patent

CA 2563232

Ethylcellulose having an ethoxyl content of from 40 to 55 percent and a viscosity of from 1 to 100 mPa's, measured as a 5 weight percent solution in toluene and ethanol at a volume ratio of 80:20 at 25~C, is produced by depolymerization of an ethylcellulose having an ethoxyl content of from 40 to 55 percent and a viscosity of from 4 to 400 mPa's in the presence of gaseous hydrogen halide to achieve a reduction in viscosity of the ethylcellulose of at least 10 percent.

L'invention concerne de l'éthylcellulose dont la teneur en éthoxy est comprise entre 40 et 55 % et la viscosité entre 1 et 100 mPa, mesurée comme solution de 5 % en poids dans le toluène et l'éthanol à un rapport volumique de 80:20 à 25 ·C, qui est produite par dépolymérisation d'une éthylcellulose dont la teneur en éthoxy est comprise entre 40 et 55 % et le viscosité entre 4 et 400 mPa en présence d'halogénure d'hydrogène gazeux pour obtenir une réduction de la viscosité de l'éthylcellulose d'au moins 10 %.

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