| 摘要 |
<p>PURPOSE:To improve the production yield of a toner by dispersing a magnetic toner before classification process in a hot air flow at temp. higher than the softening point of the binder resin for the heat treatment to fix fine magnetic toner particles to the surface of the magnetic toner. CONSTITUTION:This toner consists of a binder resin and a magnetic material. Before the toner is classified, the toner is dispersed in a hot air flow at temp. higher than the softening point of the binder resin so that fine magnetic toner particles which are essentially to be removed in the classification process are fixed to the magnetic toner surface by the heat treatment. Namely, the magnetic toner powder consisting of the binder resin 1 and magnetic powder 2 and having 10mum volume average particle size and contains 47 number % of fine toner particles having 5mum particle size is obtd. by mixing and kneading 100 pts.wt. of styrene-butylacrylate resin, 60 pts.wt. of magnetite, etc., and then melting, cooling and pulverizizing them. This toner powder is introduced into a hot air flow to melt the resin on the surface of the toner and simultaneously fixed. Then silicon is externally added.</p> |
