Browse Prior Art Database

Monocomponent Toner

IP.com Disclosure Number: IPCOM000050797D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Burger, LC: AUTHOR

Abstract

Metal salts of stearic acid are incorporated into the bulk of monocomponent toner in order to improve the toner's flowability, fusing and hot roll release properties, and in order to provide a toner which is less dusty.

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Monocomponent Toner

Metal salts of stearic acid are incorporated into the bulk of monocomponent toner in order to improve the toner's flowability, fusing and hot roll release properties, and in order to provide a toner which is less dusty.

Zinc stearate in weight percent quantities above 5 wt.% is dry blended with the toner's other raw materials. The zinc stearate is thereafter uniformly distributed throughout the toner material's bulk during the melt process step of toner manufacture. Later, when the toner material is ground to size, the resulting individual toner particles will have a uniform distribution of zinc stearate particles embedded within the outer surface.

The coefficient of friction of toner with and without zinc stearate was found to be 1.19 and 1.75, respectively.

The sharp melting point of zinc stearate (266 degrees F) is high enough not to hinder the toner's caking property. Zinc stearate readily melts at the nominal hot roll fusing temperature (360 degrees F), and has excellent hot roll release properties. Another advantage of zinc stearate is that it oes not interact with toner polymers to produce undesirable effects, such as plasticizing the polymer.

In the following formulation, a nigrosine dye is added in a proportion which is operable to "quench" the triboelectric effect of the relatively large quantity of zinc stearate. In this manner, the desirable effects of zinc stearate are utilized without alternating the toner's desired triboelectric...