Liquid developer compositions containing polyolefin resins

A liquid developer composition consisting essentially of a liquid vehicle, pigment particles, a charge control additive, and a resin selected from the group consisting of polyolefins, halogenated polyolefins, and mixtures thereof, said resin being soluble in said liquid vehicle at elevated temperatures and insoluble in said liquid vehicle at ambient temperatures, wherein said liquid developer is prepared by dissolving the resin in the liquid vehicle at temperatures of from about 80.degree. C. to about 120.degree. C., subsequently adding the pigment particles to the resulting solution, attriting the resulting mixture for from about 20 to about 75 minutes, cooling the mixture to ambient temperature with continuous mixing, and subsequently adding to the solution the charge control additive to form a developer containing toner particles consisting of the resin and the pigment particles.

A liquid developer composition which comprises a liquid vehicle, a charge control additive, and toner particles containing pigment particles and a resin selected from the group consisting of polyolefins, halogenated polyolefins, and mixtures thereof, said resin being soluble in said liquid vehicle at elevated temperatures and insoluble in said liquid vehicle at ambient temperatures.

A liquid developer composition comprising a liquid vehicle, pigment particles, a charge control additive, and a resin selected from the group consisting of polyolefins, halogenated polyolefins, and mixtures thereof, said resin being soluble in said liquid vehicle at elevated temperatures and insoluble in said liquid vehicle at ambient temperatures, wherein said liquid developer is prepared by dissolving the resin in the liquid vehicle at temperatures of from about 80.degree. C. to about 120.degree. C., subsequently adding the pigment particles to the resulting solution, attriting the resulting mixture for from about 20 to about 75 minutes, cooling the mixture to ambient temperature with continuous mixing, and subsequently adding to the solution the charge control additive to form a developer containing toner particles consisting of the resin and the pigment particles.

A process for preparing a liquid developer composition which comprises dissolving in a liquid vehicle at temperatures of from about 80.degree. C. to about 120.degree. C. a resin selected from the group consisting of polyolefins, halogenated polyolefins, and mixtures thereof, said resin being soluble in said liquid vehicle at elevated temperatures and insoluble in said liquid vehicle at ambient temperatures, subsequently adding pigment particles to the resulting solution, attriting the resulting mixture for from about 20 to about 75 minutes, cooling the mixture to ambient temperature with continuous mixing, and subsequently adding to the solution a charge control additive.

A liquid developer composition consisting essentially of a liquid vehicle, a charge control additive, and toner particles containing pigment particles and a resin selected from the group consisting of poly-.alpha.-olefins, chlorinated polypropylenes, and mixtures thereof, said resin being soluble in said liquid vehicle at temperatures of from about 75.degree. C. to about 125.degree. C. and insoluble in said liquid vehicle at temperatures of from about 10.degree. C. to about 65.degree. C.