Patent ID: 6197470
Filing Date: 2001-03-06
Classification: G03G

Abstract:
A toner comprising toner particles and a hydrophobic fine silica powder, wherein;said hydrophobic fine silica powder has the following hydrophobic properties (i) and (ii) when hydrophobic properties possessed by the hydrophobic fine silica powder are represented by using a methanol-dropping transmittance curve prepared by measuring transmittance using light of 780 nm in wavelength while adding methanol dropwise at a rate of 1.3 ml/min. to a measuring sample fluid prepared by adding the hydrophobic fine silica powder precisely in an amount of 0.06 g in a container holding 70 ml of an aqueous methanol solution composed of 60% by volume of methanol and 40% by volume of water;(i) the transmittance of said measuring sample fluid at a methanol content of from 60% by volume to 72% by volume is 95% or more; and(ii) the transmittance of said measuring sample fluid at a methanol content of 74% by volume is 90% or more.