Russia: Alchemie — colour pigment pastes for paints & inks

Abstract

The dynamics of wet ink gloss on model pigmented latex coatings is recorded immediately after printing, every 0.1 s, and followed for 60 s. Two distinct types of latices are used with three spherical polystyrene pigment sizes, at five pigment volume concentrations (PVCs). A novel gloss-meter device is used for the first time to investigate the influence of the latex type and the latex level on the ink gloss dynamics.The type of latex in the coating has a dramatic influence on the print gloss dynamics at low PVC: the high interactivity latex retards print gloss development at short times and results in low print gloss. As PVC increases, the print gloss reaches a maximum. As PVC becomes large, both latex types show a decrease in print gloss. The pigment size influences the results at high PVC. Two different mechanisms seem to be responsible for the gloss results: (1) the leveling of the ink film defects is slowed by penetration of the mobile phase into the coating pore structure by capillary pressure effects, and (2) the leveling is stopped when the mobile phase diffuses into the latex matrix.