Cellulose acetate fiber, cellulose acetate band, and method for manufacturing cellulose acetate band
AssigneeDaicel Corporation
InventorsKyokutou Ga, Hiroki Taniguchi
Life of this patent
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Abstract
An object is to mitigate plugging of spinneret hole, the plugging occurring with the passage of spinning time, even though cellulose acetate has a small titanium dioxide content or contains no titanium dioxide, and to prevent a reduction in pressure drop of the resulting cellulose acetate band. A cellulose acetate fiber having a titanium dioxide content of not greater than 0.05 wt. %; and a content of at least one type of metal oxide selected from the group consisting of Fe3O4, Fe2O3, MnO2, Cr2O3, Cr2CuO4, NiO, Sb2O3, and CoAl2O4 of not smaller than 0.05 wt. % and not greater than 1 wt. %.
Claims14
A cellulose acetate fiber having:
- a titanium dioxide content of not greater than 0.05 wt. %;
- a content of at least one metal oxide selected from the group consisting of Fe3O4, Fe2O3, MnO2, Cr2O3, Cr2CuO4, NiO, Sb2O3, and CoAl2O4 of not smaller than 0.05 wt. % and not greater than 1 wt. %;
- and
- wherein the magnesium content is not greater than 300 ppm.
A method for producing a cellulose acetate band, the method comprising:
- preparing a spinning dope including dissolving cellulose acetate, and adding at least one metal oxide selected from the group consisting of Fe3O4, Fe2O3, MnO2, Cr2O3, Cr2CuO4, NiO, Sb2O3, and CoAl2O4 at not smaller than 0.05 wt. % and not greater than 1 wt. % in terms of solid content;
- filtering the spinning dope;
- and
- spinning the cellulose acetate using the filtered spinning dope;
- wherein titanium dioxide, if added, is not added until the spinning;
- and
- wherein the magnesium content is not greater than 300 ppm.
Dependencies are inferred from the claim text.