Cellulose particles and cellulose particle dispersions

Abstract

To provide: cellulose particles which are less apt to cause interparticle aggregation, are light in weight, and have satisfactory dispersibility in oil-based liquids; and a dispersion of cellulose particles.SOLUTION: Cellulose particles comprise aggregates of microfibrous cellulose having an average fiber diameter of 1-1,000 nm and an average fiber length of 0.01-1,000 μm and have a tap bulk density of 0.1-200 mg / cm3. There is also provided a dispersion of cellulose particles.SELECTED DRAWING: Figure 2

Claims

1. Cellulose particles formed by the aggregation of fine fibrous cellulose having an average fiber diameter of 1 to 1000 nm, The fine fibrous cellulose is made from bleached hardwood kraft pulp (LBKP) or bleached softwood kraft pulp (NBKP) as the raw material pulp. The water retention capacity of the aforementioned fine fibrous cellulose is 100 to 500%, The cellulose particles are freeze-dried particles with an average particle diameter of 0.1 to 1000 μm, a specific surface area of ​​20 m² / g or more and 5000 m² / g or less, and a compacted bulk density of 0.1 to 200 mg / cm³. Cellulose particles characterized by the following features.

2. The aforementioned microfiber cellulose is a modified microfiber cellulose in which a phosphite ester group is introduced to the hydroxyl group of the cellulose fiber. Cellulose particles according to claim 1.

3. A cellulose particle dispersion in which cellulose particles according to claim 1 or claim 2 are dispersed in an oil.

4. A cellulose particle dispersion according to claim 3, containing 0.1 to 20% by mass of the cellulose particles according to claim 1 or claim 2.

Images