Electrostatic developer particles containing resin, colorant, metal salt and phthalate

Claim 2

A solid xerographic-developer material according to claim 1 wherein said solid diester is dihydroabietyl phthalate.

Claim 3

A solid xerographic-developer material according to claim 1 wherein said solid diester is dicyclohexyl phthalate.

Claim 4

A solid xerographic-developer material according to claim 1 wherein said finely divided dry toner material contains at least about 25 percent by weight, based on the total weight of said thermoplastic resin in said toner, of a styrene resin.

Claim 5

A solid xerographic-developer material according to claim 1 wherein said solid, stable hydrophobic metal salt of a fatty acid is zinc stearate.

Claim 6

A solid xerographic developer material according to claim 1 wherein said finely divided toner particles are uniformly electrostatically coated on a carrier surface consisting essentially of carrier particles having an average particle diameter between about 50 to about 1,000 microns.

Claim 7

A solid xerographic-developer material according to claim 7 wherein said solid xerographic-developer material comprises about 1 part by weight of said finely divided dry toner material and from about 10 to about 200 parts by weight, of said carrier particles.

Claim 8

A treated solid xerographic-toner material having a particle size range of up to about 30 microns, a blocking temperature of at least about 110* F., a melt viscosity less than about 2.5 X 10 4 poise at temperatures up to about 450* F., and comprising a colorant selected from the group consisting of a pigment and a dye, a thermoplastic resin consisting essentially of a vinyl polymer having a melting point of at least about 110* F., about 2 percent to about 45 percent by weight, based on the total weight of said resin, of a solid diester having a melting point at least about 110* F. and selected from the group consisting of o-phthalic and m-phthalic acid esters of monohydric alcohols, and from about 0.02 percent to about 20 percent by weight, based on the weight of said toner particles of at least one solid, stable hydrophobic metal salt of a fatty acid having a melting point greater than about 57* C. and available at the external surfaces of the toner particles.

Claim 9

A solid xerographic developer material comprising finely-divided toner particles uniformly electrostatically coated on a carrier surface capable of retaining said toner particles by electrostatic attraction, said toner particles having a particle size range of up to about 30 microns, a blocking temperature of at least about 110* F., a melt viscosity less than about 2.5 X 10 4 poise at temperatures up to about 450* F., and comprising a colorant selected from the group consisting of a pigment and a dye, a thermoplastic resin consisting essentially of a vinyl polymer having a melting point at least about 110* F., and a solid diester having a melting point at least about 110* F. and selected from the group consisting of o-phthalic acid esters and m-phthalic acid esters of monohydric alcohols.