Hydrophobic silica powder and toner resin particle

A silicon dioxide, hydrophobic technology, applied in the direction of silicon dioxide, silicon oxide, developer, etc., can solve the problem of not obtaining the degree of hydrophobicity, and achieve the effect of high degree of hydrophobicity, narrow particle size distribution, and small particle size
CN113544091APending Publication Date: 2021-10-22FUSO CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUSO CHEM
Publication Date
2021-10-22

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Abstract

The present invention provides: a hydrophobic silica powder that has a small particle diameter, has a narrow particle size distribution, has a high degree of hydrophobicity, and contains a fractional amount of organic acid; and a toner resin particle that has such hydrophobic silica powder on the surface thereof. The hydrophobic silica powder is characterized by having, when measured by the laser diffraction method, a particle diameter (D50) of no greater than 300nm, a particle size distribution index (D90 / D10) of no greater than 3.0, a hydrophobicity of no less than 60 volume percent, and an organic acid concentration of 1~300 ppm.
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Description

technical field

[0001] The present invention relates to hydrophobic silica powder and toner resin particles. Background technique

[0002] Hydrophobic silica powder is obtained, for example, by adding a hydrophobizing agent to a dispersion of silica particles obtained by a sol-gel method (i.e., colloidal silica) to hydrophobize the surface of the silica particles (e.g. , Patent Documents 1-3). This hydrophobization treatment is called "wet hydrophobization treatment" because the object to be treated is dispersed in the liquid.

[0003] In Patent Document 1, wet hydrophobization treatment is performed under conditions such as making 30% by mass of a hydrophobizing agent react at 35° C. for 1 hour with respect to the silica in the colloidal silica. The hydrophobic silica powder obtained by such treatment has a degree of hydrophobization of 27 to 61% by volume.

[0004] In Patent Document 2, wet hydrophobization treatment is performed under conditions such as making 20% ​​by...

Claims

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