Effects of the Composition of Anthraquinones Pigment Dispersion and Dispersion Condition on the Properties of the Dispersion and the Coating for LCD Color Filters

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An anthraquinone pigment C. I. Pigment Red 177 was dispersed in propylene glycol monomethyl ether acetate with sulfonic acid derivative of the pigment and poly (ethyleneimine) grafted poly (12-hydroxystearic acid) as dispersants. Using this dispersion, color resist inks for LCD color filters were prepared. In the observation of color filters surface prepared from the inks with a reflecting microscope, spherical foreign matters were found. The size of these spherical foreign matters became bigger, as the fraction of the sulfonic acid derivative in the dispersion increased. Although the addition of the derivative formed the spherical foreign matters, the surface roughness of color filters prepared from the dispersion with the derivative was decreased remarkably. The transmittance of color filters prepared from the dispersion with 5% of the derivative was higher than that without the derivative, but when the fraction of the derivative was 10% or more, the transmittance of color filter was lower than that of 5% and decreased with the fraction. These phenomena were explained by the following : lowered surface roughness increased the transmittance of color filters with up to 5% of the derivative fraction, but too many spherical foreign matters formed on the color filters with the derivative of 10% or more decreased the transmittance.
Japan Society of Colour Materialの論文