Abstract
A marked development of ink jet printing system is expected in a color copying. Peculiar properties required for an ink jet printing paper are 1) a satisfactory ink-absorbing capacity, 2) uniform shape of dot like true circle, 3) an excellent color performance (density, gloss, hue, and clearness), 4) a prominent light-resisting property, and 5) a favorable surface strength.When Mizukasil P-78 (or CaO-coated product) of gel type amorphous silica is coated on a surface of the ink jet printing paper, the five factors mentioned above are significantly improved, and an excellent color image can be obtained. Thus the amorphous silica shows an excellent clearness, hygroscopicity and surface dyeing property ; and shows a favorable range of pore distribution, acid strength distribution, density of silanol group and particle size distribution.It becomes clear that an excellent color image of the ink jet printing paper is how to functionalize the surface of coated layer with due regard to the compatibility of ink with the ink jet printing paper.
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