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Treatment to Prevent Agglomeration of Inorganic Photoconductive Particles

IP.com Disclosure Number: IPCOM000094777D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Chapman, DW: AUTHOR

Abstract

Inorganic photoconductive particles tend to agglomerate when the particles are classified according to size. If, however, these particles are treated with an aqueous solution of an amino-functional silane, e.g., Dow Corning Z-6020, the particles pass through a classifier without agglomeration. The treatment consists of the following steps: 1. Dispersing the inorganic photoconductive particles, such as ZnCdS, in about a.01 to.05% aqueous solution of a silane containing primary and secondary amino groups, 2. Wet ball milling the dispersion for about 30 minutes, 3. Drying the particles in an oven at about 250 degrees F, and 4. Dry ball milling the particles for about 30 minutes to one hour.

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Treatment to Prevent Agglomeration of Inorganic Photoconductive Particles

Inorganic photoconductive particles tend to agglomerate when the particles are classified according to size. If, however, these particles are treated with an aqueous solution of an amino-functional silane, e.g., Dow Corning Z-6020, the particles pass through a classifier without agglomeration. The treatment consists of the following steps: 1. Dispersing the inorganic photoconductive particles, such as ZnCdS, in about a.01 to.05% aqueous solution of a silane containing primary and secondary amino groups, 2. Wet ball milling the dispersion for about 30 minutes, 3. Drying the particles in an oven at about 250 degrees F, and 4. Dry ball milling the particles for about 30 minutes to one hour.

If the solution is stronger than about 5%, there is a detrimental effect on the photoconductivity of the particles. If the solution is less than about. 01%, the particles still agglomerate.

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