Aqueous dispersion composition containing microfibril cellulose fibers

Abstract

The present invention provides an aqueous dispersion composition which contains microfibrillated cellulose fibers having an average fiber diameter of 500 nm or more, and which is characterized in that if this aqueous dispersion composition is adjusted so as to have a solid content concentration of 1% by mass, and is uniformly spread over a horizontal surface and dried thereon, thereby being formed into a sheet, and the intensity XFe derived from iron atoms and the intensity XK derived from potassium atoms are determined by X-ray fluorescence analysis of the thus-obtained sheet, the relational expression XFe / XK ≤ 150 is satisfied.

Claims

1. An aqueous dispersion composition containing microfibril cellulose fibers having an average fiber diameter of 500 nm or more, The microfibril cellulose fibers are oxidized microfibril cellulose fibers having a carboxyl group content of 0.8 to 2.0 mmol / g. The aqueous dispersion composition is prepared to have a solid content concentration of 1% by mass, which is then spread uniformly on a horizontal surface and dried to form a sheet. The resulting sheet is then measured by X-ray fluorescence to determine the intensity of the iron atoms. Ｆｅ And, the intensity X derived from potassium atoms Ｋ When calculating this, 10 ≤ X Ｆｅ / X Ｋ The relationship satisfies ≤ 150, The electrical conductivity of the aqueous dispersion composition, adjusted to a solid content concentration of 1% by mass and pH 8, is 10 to 90 mS / m. A water-dispersible composition characterized by its use in cosmetics, resins, rubber, or food products.

2. The aqueous dispersion composition according to claim 1, characterized in that the microfibril cellulose fibers have a degree of crystallinity of cellulose type I of 50% or more.

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