| 摘要 |
PURPOSE: To optionally adjust particle sizes of resin particles and to make the grain size distribution narrow and further to improve picture qualities such as image density, image bleeding and image flowing by incorporating a phosphoric ester surfactant into a toner. CONSTITUTION: A phosphoric ester surfactant is incorporated into the liquid toner containing an ethylenic copolymer alone or an ethylenic copolymer added with a colorant and an electrical insulating liquid. As the ethylenic copolymer, ethylene-vinyl acetate copolymer, partial saponification product of the ethylene- vinyl acetate copolymer, ethylene-acrylic acid and ethylene-acrylic acid ester are exemplified. As the electrical insulating liquid, a solvent having >=10<10>Ω.cm electrical resistivity, <=3 dielectric constant and a low solubility of ethylenic copolymer is preferable. As the phosphoric ester surfactant, compounds expressed by the formula are exemplified. In formula, R denotes an alkyl group or an alkylallyl group, (n) denotes addition molar number of eyhylene oxide and R' denotes H or R(CH2 CH2 O)n .
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