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.
The adhesion durability was investigated for three-layer-polyethylene-coated steel pipe (steel/epoxy primer/adhesion polyethylene/polyethylene). In the epoxy primer layer, V2O5 was included as a pigment. The coating adhesion loss and delamination of polyethylene-coated steel pipe were caused by OH- which was generated by oxygen reduction at the interface between steel surface and coating layer. V2O5 has a property to control pH of water layer at the interface area to be around isoelectric point of surface (IEPS). By the presence of V2O5, of which IEPS was 2.8, the OH- that caused adhesion loss and delamination was neutralized and adhesion loss was repressed. The polyethylene-coated steel pipe which has the epoxy primer layer with 30 mass % V2O5, had good adhesion durability, especially at high temperature such as 80°C.
The treatment of ultrafine silica surface with alkylalkoxysilane was carried out in a dry system for the introduction of alkyl groups onto the surface. In the treatment, water and alkylalkoxysilane were sprayed onto silica surface under nitrogen atmosphere and the reaction was conducted at 250°C for 180 min under agitation. The effects of the amount of alkylalkoxysilane and alkyl chain length of alkylalkoxysilane on the reaction of alkylalkoxysilane with silanol groups of the surface were investigated. The carbon content, hydrophobic nature, and charging of treated silica surface were found to increase and the content of surface silanol group decreased with increasing amount ratio of alkylalkoxysilane to silanol groups on the surface. The reactivity of alkylalkoxysilane with surface silanol groups decreased with increasing chain length of alkylalkoxysilane because of steric hindrance. In addition, the reactivity of alkylalkoxysilane with surface silanol groups increased with increasing number of methoxy groups of alkylalkoxysilane.