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In this study of kaolin and latex chemistry influence on the specific Gibbs energy (∆Gs) in ink oil imbibition into a pilot coated solid bleached sulfate (SBS) board, we show that ∆Gs with coating structure variables (volume and diameter, Σ(Vi / Di)/m) and surface energy parameters (γcosθ) are affected by changes in kaolin and latex chemistry. We found that the base γ amounts (from van Oss-Chaudhury-Good approach) on coated board surfaces were low compared to Lifshitz-van der Waals, γ interactions while the acid γ was very low, and in turn the acid-base, γ portion. We conclude that the specific Gibbs energy concept combining Σ(Vi / Di)/m) and γcosθ at interface suites better for characterizing capillary adsorption during oil-based ink setting than each parameter alone, especially when both pigment and latex chemistry are changed. Along with this study we also observed that two types of kaolin with constant γ and different γ changed ∆Gs and coated paper capillary adsorption in offset ink setting as seen in the different time needed to reach the maximum tack force, tmax but with no effect on the maximum tack force, Fmax and the final tack. We further demonstrated that compared to styrene/n-butyl acrylate latex, n-butyl acrylate-acrylonitrile-styrene latex lowered γ on coated board surface and ∆Gs, and significantly increased tmax, and reduced Fmax and the final tack. We expect that the specific Gibbs energy approach may find applications in analyzing general interactions of porous coatings with polar and non-polar liquids on a macro-scale.

Coating: The influence of coating structure and surface energy on Gibbs energy of ink oil imbibition during ink setting