Wrinkle configured electrophotographic capsule toner particles

Claim 2

A capsule toner which comprises a shell of a chargeable resin and a filling therein, said filling containing at least a high boiling point solvent, a resin for fixation dissolved or dispersed in said solvent, and a colorant, wherein the shape of said toner is irregular and has a wrinkled surface as substantially depicted in FIG. 3, and the number average particle sizes range from 5 to 17 μm in the distribution of the particles, the particles with sizes if less than 3 μm having a proportion of less than 10% in number and those with sizes of more than 20 μm having a proportion of less than 5% in number.

Claim 3

A capsule toner of claim 1, in which the shell is made from isocyanates and polyols of polyamines.

Claim 4

A capsule toner of claim 1, in which the shell has a thickness of from 0.01 to 0.8 micron meter.

Claim 5

A capsule toner of claim 1, in which the solvent is aliphatic hydrocarbons which may have a branch and/or organic polysiloxane.

Claim 6

A capsule toner of claim 1, in which the solvent has a boiling point of from 150° to 350° C.

Claim 7

A capsule toner of claim 1, in which the filling contains a solvent having a lower boiling point in addition to the solvent having a high boiling point.

Claim 8

A capsule toner of claim 1, in which the resin for fixation is derived from the polymerization of one or more of monomers selected from the group consisting of acrylic acid esters, methacrylic acid esters, styrenes, and vinyl monomers.

Claim 9

A capsule toner of claim 1, in which said capsule toner is formed by a process comprising a step of mixing at least a high boiling point solvent, a first shell forming monomer, a fixing monomer, a polymerization initiator and a colorant to make a dispersion; a step of emulsifying the dispersion into fine oil drops in an aqueous medium containing a second shell forming monomer; and a step of forming the shell around the oil drops by means of interfacial polymerizzation between said first and second shell forming monomers and simultaneously or subsequently polymerizing the fixing monomer in the dispersion by means of in-situ polymerization.

Claim 10

A capsule toner of claim 1, in which the shape factor (SF1) represented by the formula: ##EQU5## (wherein the maximum length is the largest distance between any two points on the periphery in the projection chart of a particle, and the area represents the area of the projection of a particle).

Claim 11

A capsule toner of claim 1, in which the ratio of the monomer for producing a resin for fixation to the solvent is 1-1000 parts by weight to 100 parts by weight.

Claim 12

A capsule toner of claim 1, in which the dispersion particle in the emulsion is adjusted to 3-20 micron meter in terms of number average particle sizes.

Claim 13

A capsule toner of claim 1, in which the interfacial polymerization is carried out at 10°-60° C., and the in-situ polymerization at a temperature of from 50°-90° C.