| 摘要 |
Developer for electrographic printing contains a mixt. of at least 2 component toners of different colours, with a fluidity of 80 degrees or less, pref. 20-60 degrees expressed as flow angle. The difference in the electrostatic charge of the component toners should be not >5 x 10-5, pref. is not >3 x 10-5 esp. not >1.5 x 10-5 C/g. whlst the absolute value of the static charge of each is not >10 x 10-5 C/g and their average particle size is not >100, pref. not >40, esp. not >20 mu m. - Uniform colours result during a long printing process. Pref. the toners are mixed with a particulate carrier, with an average particle size of 50-500 mu m. the mixing ratio being is not >30%. The mixt. contains 0.01-5 wt.% alkaline earth oxide, pref. 0.005-3.0, esp. 0.1-2.0% light or heavy MgO and/or 0.05-5.0 pref. 0.1-3.0% triazine cpd.
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