Relationship between Component of Resins and Resistance for Water-based Gravure Inks

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  • 水性グラビアインキの樹脂組成と堅ろう性
  • スイセイ グラビア インキ ノ ジュシ ソセイ ト ケンロウセイ

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Water-based ink has been inferior in quality due to water resistance and alkali resistance of prints. In this study, we focused on water-soluble styrene⁄acrylic (St⁄Ac) resins as water-based gravure ink resins. St⁄Ac resins can improve the physical property of prints by changing monomer types and composition of monomers.Water-based gravure inks using St⁄Ac resins were tested. The relationship between the component of St⁄Ac resins and water resistance and alkali resistance of the prints were discussed. It was confirmed that resolubility of resins was opposite to water resistance and alkali resistance of prints. However, it was difficult to anticipate the printing quality from the composition of resin. To appreciate the hydrophobic properties of resins, the logarithm of 1-octanol-water partition coefficient (LogP) of St⁄Ac resins was calculated from the mole fraction of monomers and LogP of monomers. As a result, LogP of St⁄Ac resins correlated with the resolubility of the resin and water resistance and alkali resistance of prints.

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