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A process for producing an alumina-based fiber, which involves mixing an aluminum compound represented by the general formula AIR1R2R3 (wherein R1R2 and R3 are each an organic group or a halogen) with water in a molar ratio of ([H2O]/[AIR1R2R3]) of 1.10 to 1.40 to produce a polyaluminoxane, mixing t

A process for producing an alumina-based fiber, which involves mixing an aluminum compound represented by the general formula AIR1R2R3 (wherein R1R2 and R3 are each an organic group or a halogen) with water in a molar ratio of ([H2O]/[AIR1R2R3]) of 1.10 to 1.40 to produce a polyaluminoxane, mixing the polyaluminoxane with at least one silicon-containing compound in an amount such that desired alumina-based fiber has, after calcining, a silica content of up to 70%, spinning the resulting mixture of polyaluminoxane and silicon-containing compound under an atmosphere controlled at a temperature of above 28°C. and a relative humidity of above 35% to obtain precursor fiber, and then calcinating the precursor fiber to obtain an alumina-based fiber.

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A process for producing an alumina-based fiber, which comprises mixing an aluminum compound represented by the general formula AlR1R2R3 (wherein R1, R2 and R3 are each an organic group or a halogen) with water in a molar ratio of ([H2O/[AlR1R2R3]) of 1.10 to 1.40 to produce a polyaluminoxane having

A process for producing an alumina-based fiber, which comprises mixing an aluminum compound represented by the general formula AlR1R2R3 (wherein R1, R2 and R3 are each an organic group or a halogen) with water in a molar ratio of ([H2O/[AlR1R2R3]) of 1.10 to 1.40 to produce a polyaluminoxane having a structural unit represented by the general formula: [Figure] (wherein Y is at least one member selected from the group consisting of organic groups, halogens and hydroxyl groups), mixing the polyaluminoxane with at least one silcon-containing compound in an amount such that the desired alumina-based fiber has, after calcining, a silica content of up to 70%, spinning the resulting mixture of polyaluminoxane and silicon-containing compound under an atmosphere controlled at a temperature of about 28°C. and a relative humidity of above 35% to obtain a precursor fiber, and then calcinating the precursor fiber to obtain an alumina-based fiber.