| 摘要 |
PURPOSE:To enable only secondary coagulated particles to be rapidly removed effectively by filtering them off from a photosensitive soln. prepared by dispersing an electrostatic charge generating pigment into a charge transfer medium with a quartz glass filter under pressure. CONSTITUTION:A charge generating pigment, such as a perylene type pigment, is dispersed into a charge transfer medium essentially consisting of, e.g., a PVK type resin, to form a liquid photosensitive dispersion 4, introduced into a filtration vessel 1, and the secondary coagulated particles are filtered off from the dispersion 4 by filtering it with pressure. The filter 20 used as a filtering means has an opening diameter of 1-20mum and the vessel 1 and the dispersion 4 therein are subjected to a pressure of 2-9kg/cm<2> by using compressed air. Only the secondary coagulated particles in the liquid dispersion 4 can be blocked by filtering it with such a filtering device, and mixing of fragments, etc., of the filter glass is prevented, and the use of such a photosensitive dispersion 4 permits image whitening, background staining, etc., to be prevented, and a sharp image to be obtained. |
