Toner for use in compositions for developing latent electrostati

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Process of making developer composition

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G03G 913

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active

050473077

ABSTRACT:
A liquid composition for developing latent electrostatic images comprising toner particles associated with the pigment dispersed in a nonpolar liquid. The salient feature of the invention is that the toner particles are formed with a plurality of fibers or tendrils from a thermoplastic polymer and carry a charge of a polarity opposite to the polarity of the latent electrostatic image. The polymer is insoluble or insolvatable in the dispersant liquid at room temperature. The toner particles are formed by plasticizing the polymer and pigment at elevated temperature and then either permitting a sponge to form and wet-grinding pieces of the sponge or diluting the plasticized polymer-pigment while cooling and constantly stirring to prevent the forming a sponge while cooling. When cool, the diluted composition will have a concentration of toner particles formed with a plurality of fibers.

REFERENCES:
patent: 4631244 (1986-12-01), Mitchell
patent: 4707429 (1987-11-01), Trout

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