HYDROPHOBIC METAL OXIDE POWDER AND USE THEREOF

Title:

HYDROPHOBIC METAL OXIDE POWDER AND USE THEREOF

Document Type and Number:

WIPO Patent Application WO/1997/012835

Kind Code:

A1

Abstract:

A hydrophobic metal oxide powder obtained by surface-treating a powder of a metal oxide such as silica, titania or alumina simultaneously with a silicone oil having epoxy groups and a non-polymeric amine compound having primary and/or secondary amino groups in an amount not enough for reacting with all of the epoxy groups, or with a silicone oil having epoxy and amino groups which has been obtained by reacting the above-mentioned materials with each other. A straight silicone oil may be also employed in the surface treatment. It is possible thereby to impart the capability of triboelectrification regulated over a wide range from negative to positive electrostatic charges, a highly hydrophobic nature and a high fluidity to the power at a relatively small coating weight, thus giving a hydrophobic metal oxide powder useful as an additive for an electrophotographic developer.

Inventors:

NISHIHARA AKIRA (JP)
YAMASHITA YUKIYA (JP)
SAKURAI HIDEAKI (JP)

Application Number:

PCT/JP1996/002836

Publication Date:

April 10, 1997

Filing Date:

September 30, 1996

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)
NISHIHARA AKIRA (JP)
YAMASHITA YUKIYA (JP)
SAKURAI HIDEAKI (JP)

International Classes:

C09C1/30; C09C1/36; C09C1/40; C09C3/00; C09C3/12; G03G9/097; (IPC1-7): C01B13/14; C01B33/18; C01F7/02; C01G23/00

Foreign References:

JPH0680406A	1994-03-22
JPS59137305A	1984-08-07

Other References: