Electrophotographic developer powder

摘要

A developer (T) comprising a first wax-containing binder resin consisting of a first wax (W1) and a first binder resin (B1), a second wax-containing binder resin consisting of a second wax (W2) and a second binder resin (B2), and a colourant. W1 has a solubility parameter SP1; B1 has a solubility parameter SP2; and the difference (SP1-SP2) = DELTA 1. W2 has a solubility parameter SP3; B2 has a solubility parameter SP4; SP3 < SP1; the difference (SP1-SP4) = DELTA 2; and DELTA 2 > DELTA 1. Also claimed is an image-forming apparatus which forms a latent electrostatic image which can developed using the developer composition.