| 摘要 |
PURPOSE:To obtain a toner which obviates offset in fixing with hot press rolls and obviates sticking of printed pattern to non-rigid PVC by incorporating a vinyl polymer in which the glass transition point of the polymer having >=50,000 mol.wt. is specific deg.C and the ratio of the polymer is specific weight % into said toner. CONSTITUTION:The vinyl polymer has a hydroxyl group in such a way that the hydroxyl value attains 50-350, more preferably 80-250(KOHmg/g). Sticking to non-rigid PVC cannot be prevented if the hydroxyl value is <50 and the deteriorated electrifiability of the toner is resulted from increased hygroscopicity if said value exceeds 350. The glass transision temp. of the polymer having >=50,000mol.wt. among the vinyl polymers is 20-90 deg.C, more particularly preferably 30-80 deg.C. The blocking resistance of the toner is inferior if <20 deg.C and fixability is inferior if said point exceeds 90 deg.C. The ratio of the polymer with the vinyl polymer is 5-95wt%, more particularly 10-90wt%. The effect of improving offset is not expected at <5wt% and the fixability of the toner is inferior if the ratio exceeds 95wt%. |
