Polymeric Surfactants Bearing Divalent Carboxy Pendants for Stable Color Dispersions with High Redispersibility,ACS Applied Polymer Materials

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Polymeric Surfactants Bearing Divalent Carboxy Pendants for Stable Color Dispersions with High Redispersibility
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-06-23 , DOI: 10.1021/acsapm.3c00505
Toshihiro Ohtake ₁ , Hiroshi Ito ₁ , Koji Horiba ₁ , Naoyuki Toyoda ₁ , Yasuhiro Kohsaka _{2,

3}

Affiliation

Inkjet printing of ink requires dyes or pigments insoluble in water but uniformly dispersing as fine particles for a long period. In addition, redispersibility after solidification by solvent vaporization around the jetting heads is also important for performance. In this study, thus, a series of amphiphilic copolymers were prepared for a dispersant of inkjet using reversible addition fragmentation chain-transfer copolymerization of styrene (St), benzyl acrylate (BnA), and phenoxyethyl acrylate (PEA) as a hydrophobic monomer with acrylic acid (AA) and itaconic acid (IA) as a hydrophilic monomer. To understand the fundamental properties and potentials as a polymer dispersant, the surface parameters and rheology of the copolymers and their color dispersions in aqueous media were investigated. The aqueous solutions were typical Newtonian fluids, whereas the color dispersions were non-Newtonian fluids with shear-thinning properties and yield values ranging from 0.57 to 1.04 Pa. Although the surface parameters, such as surface tension (γ), molecular occupied area (A_min), and zeta potential (ζ), did not show clear correlation with polymer structures, their behaviors as a dispersant were significantly different. The color dispersants containing the copolymer of St or BnA as a hydrophobic monomer and IA and AMPS as hydrophilic monomers exhibited sufficient redispersion both for yellow and cyan inks, even after the aging test at 60 °C for 5 days, whereas other copolymers did not exhibit such superior performances. In addition, the color dispersions of the copolymer of St, IA, and AMPS (St-IA-AMPS) showed lower viscosity and yield value and became closer to Newtonian fluid compared with that of St, AA, and AMPS (St-AA-AMPS). Thus, St-IA-AMPS provided good redispersibility and avoided sedimentation. These results suggest that the most suitable dispersant for inkjet inks among the polymers investigated was the copolymer of St, IA, and AMPS.

中文翻译：

带有二价羧基侧链的聚合物表面活性剂可实现具有高再分散性的稳定颜色分散体

喷墨打印的油墨要求染料或颜料不溶于水，但能长期均匀分散为细小颗粒。此外，喷射头周围溶剂蒸发固化后的再分散性对于性能也很重要。因此，本研究采用苯乙烯（St）、丙烯酸苄酯（BnA）和丙烯酸苯氧基乙酯（PEA）作为疏水单体与丙烯酸进行可逆加成断裂链转移共聚，制备了一系列用于喷墨分散剂的两亲性共聚物。酸(AA)和衣康酸(IA)作为亲水单体。为了了解作为聚合物分散剂的基本性质和潜力，研究了共聚物的表面参数和流变性及其在水性介质中的颜色分散体。水溶液是典型的牛顿流体，A _min）和 zeta 电位（ζ）与聚合物结构没有显示出明显的相关性，它们作为分散剂的行为显着不同。含有St或BnA作为疏水单体以及IA和AMPS作为亲水单体的共聚物的彩色分散剂即使在60℃老化测试5天后，对于黄色和青色油墨也表现出足够的再分散性，而其他共聚物则没有表现出如此优越的性能。此外，与St、AA和AMPS（St- AA-）相比，St、IA和AMPS的共聚物（St-IA-AMPS）的颜色分散体表现出更低的粘度和屈服值，并且更接近牛顿流体。安普斯）。因此，St-IA-AMPS提供良好的再分散性并避免沉淀。这些结果表明，在所研究的聚合物中，最适合喷墨油墨的分散剂是 St、IA 和 AMPS 的共聚物。

更新日期：2023-06-23

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