Effect of core-shell structure latex on pigment coating properties

Abstract

The pore structure of the coating layer is one of the most important factors in determining the printability of coated papers. The coating pigment and binder are two principal components in paper coating, and their characteristics have a critical influence on the coating structure. The glass transition temperature (Tg) of latex binders affects the mechanical strength and pore structure of the pigment coating layer because the latex Tg influences the binding ability of latex and the shrinkage of the coating layer during the drying process. In this study, styrene-acrylate (S/A) core-shell structure latexes with different monomer compositions in the core and shell layers were designed, and their properties were compared with those of a conventional latex. These core-shell latexes were prepared using the same monomers in the same proportion and were used to investigate the effect of the core-shell structure on the structural and mechanical properties of the coating layer. The hard-shell latex with a high styrene content in the shell part yielded paper that was glossier and less rough and formed finer pores, resulting in an increased ink absorption rate into the coated paper compared to the other types of latex. The hard-shell structure showed better performance in printing uniformity and had less mottling.

The Silver Ion and Nanocrystalline Pattern in the Glass Substrate, the Electric Field-Induced Thermal Transfer and Ink Absorption Layer Structure and Printing Performance

“…Before printing, the image and text are printed on the intermediate transfer carrier, and then they are transferred to the substrate by special technical means such as heating, wetting, and embossing to form a printed matter. According to the classification of transfer printing technology, it can be divided into three types: cold transfer printing, thermal transfer printing, and pressure transfer printing [9]. It is mainly used in plastic, EVA, and stainless steel, and is suitable for mass production.…”

Back-trap mottle: A review of mechanisms and possible solutions

“…They found that this is because HEMA comonomers generated a more uniform binder distribution on the coating surface and in the z-direction of the coating layer, which results in more uniform print-ink absorption and less print mottling. Oh et al (2019) investigated the effect of the core-shell structure of styrene-acrylate latexes on the coating structure and print mottle and showed that a hard-shell latex with a high styrene content in its shell gives a higher gloss and less rough paper with finer pores, which results in an increased ink absorption rate and better printing uniformity and less mottling.…”

Dynamic water penetration behavior of top coating color and its effects on structure properties of double-coated layer

“…Several studies related to paper coating have focused on identifying the best pigment-binder combinations and thus the properties of the final coated product. The type and combination of the various coating color components affect the mechanical, optical, and water penetration properties of the coated paper in a complex manner (Morsy and EI-Sherbiny 2004;Ortner et al 2018;Rajabi Abhari et al 2018;Senden et al 2000;Oh et al 2019). A properly formulated coating improves diverse coated paper properties, including brightness, opacity, smoothness, surface strength, ink setting, print gloss, and so on (Al-Turaif 2006;Anthony et al 2015).…”