Structural Changes of the Coating Layer by Styrene/Acrylate Latex with Hydroxyethyl Methacrylate

Kwon, Soojin; Oh, Kyudeok; Shin, Sang Jin; Lee, Hak Lae

doi:10.1021/acsomega.9b02671

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…When the coat weight is higher than this, the positive effect of using low Tg latex decreases. Kwon et al (2019) showed that use of a styrene-acrylate latex containing hydroxyethyl methacrylate (HEMA) comonomer leads to more uniform print gloss and less mottling. 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.…”

Section: Preventive Measures For Print Mottlementioning

confidence: 99%

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

Lee

Youn

et al. 2021

BioRes

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Print mottle is a serious and common uneven printing defect that occurs when printing coated paper by the offset multicolor printing process. It is characterized by a non-uniform appearance in terms of brightness, gloss, or color density that appears mostly in solid printed areas. Back-trap print mottle and water-interference print mottle occur when the quality of the paper substrate, especially the coating layer quality, is not satisfactory. To cope with this quality problem of coated papers, the understanding of the offset printing process, the requirements of coated-paper quality, and the reasons for this problem should be addressed. In this review, the basic process of offset printing and the mechanisms of print mottles were explored, the importance of coating uniformity in both the coating structure and process was reviewed, and the approaches to cope with print mottle were introduced.

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Section: Preventive Measures For Print Mottlementioning

confidence: 99%

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

Lee

Youn

et al. 2021

BioRes

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“…A latex binder is needed in water-based pigment suspensions to obtain durable coatings in a wide range of applications, such as lithium-ion batteries [1,2], paints [3,4], and paper coatings [5,6]. For all systems, the pigments and binder are mixed in a suspension that is applied to a substrate and dried.…”

Section: Introduction *mentioning

confidence: 99%

Electrostatic Interactions to Attach Latex to Pigment Surface to Reduce Binder Migration

Rao

Bousfield

Tripp

2022

J. Coat. Sci. Technol.

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For many paints, paper coatings, and other pigmented coatings, latex and soluble binders are used to impart mechanical properties. However, non-uniform latex binder distributions are often observed in the thickness direction during application and drying, leading to quality issues. While several publications have documented this issue, few solutions are offered in the literature. Here we report a simple process to use electrostatic interactions to attach latex binder to pigments. Coating suspensions are generated using cationic precipitated calcium carbonate (PCC) pigments that are mixed with anionic styrene-butadiene (SB) latex binders resulting in latex-covered pigments. The migration of latex binder in coatings generated on various substrates under various drying conditions was measured using Raman spectroscopy and compared with reference coatings. The new system shows reduced latex binder migration for most situations than those obtained with the reference coating. The coated papers were also measured for strength, opacity, gloss, water drainage rate, and porosity. Little difference is seen in the picking strength of the coating and gloss compared to coatings prepared with standard formulations. Water drainage rate, opacity, and porosity were higher for latex-covered pigment (LCP) coatings than the reference standard coating; this increased porosity is likely due to the strong electrostatic attraction that exists between the cationic pigment and anionic latex binder that reduces the densification of the coating during drying.

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“…They commonly contain synthetic polymer latexes, which act as binders that provide strength and facilitate film formation. 1,18 In the paint and paper coating industries, these latexes have been widely prepared via emulsion polymerization. The colloidal stability of the conventional emulsion-polymerized (EP) latexes has usually been provided by electrostatic protection of surfactants.…”

Section: Introductionmentioning

confidence: 99%

“…Paper coating dispersions are often referred to as coating colors. They commonly contain synthetic polymer latexes, which act as binders that provide strength and facilitate film formation. , In the paint and paper coating industries, these latexes have been widely prepared via emulsion polymerization. The colloidal stability of the conventional emulsion-polymerized (EP) latexes has usually been provided by electrostatic protection of surfactants. , While these conventional latexes have many properties that enhance their use as paper coating binders, the technology needs to be further improved.…”

Section: Introductionmentioning

confidence: 99%

Development and Application of Nanosized Polymer-Stabilized Cobinders and Their Effect on the Viscoelastic Properties and Foaming Tendencies of Coating Colors

Rajabi‐Abhari

Shen

et al. 2020

ACS Omega

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Polymer latexes have long been used as coating binders by various branches of industry due to their capacity to adhere coating components and increase the strength of the dried final coatings. In addition, these latexes have been known to affect the rheology of coating dispersions. Currently, emulsion polymerization is the most widely used method of producing polymer latexes. While the stability of these latexes is primarily provided by electrostatic repulsion between surfactants, this property also causes foaming problems during coating processes. In this research, these problems were addressed by preparing polymer-stabilized (PS) latexes that contained different concentrations of acrylic acid. Steric protection of the latexes was provided by a protective shell consisting of starch and poly(vinyl alcohol) (PVA). The viscosity, particle size, ζ-potential, and viscoelastic behavior of the prepared latexes were investigated as a function of pH, and their surface tension and foaming tendencies were evaluated. The latexes were applied as coating cobinders in calcium carbonate and clay coating dispersions, and the viscoelastic properties, surface tensions, and foaming tendencies of these mixtures were studied. The presence of acrylic acid monomers was found to be an important factor affecting the viscosity, particle size, and ζ-potential of the PS latexes prepared in this work, which were further found to generate less foam than comparable emulsion-polymerized latexes. Finally, coating color viscoelastic properties were modified via the partial substitution of styrene–butadiene (S/B) latexes with PS latexes.

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Structural Changes of the Coating Layer by Styrene/Acrylate Latex with Hydroxyethyl Methacrylate

Cited by 6 publications

References 22 publications

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

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

Electrostatic Interactions to Attach Latex to Pigment Surface to Reduce Binder Migration

Development and Application of Nanosized Polymer-Stabilized Cobinders and Their Effect on the Viscoelastic Properties and Foaming Tendencies of Coating Colors

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