Time-course Behavior of Critical Surface Tension in Emulsion Acrylic Pressure Sensitive Adhesives

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  • アクリルエマルション型粘着剤における臨界表面張力の経時的挙動
  • アクリルエマルションガタ ネンチャクザイ ニ オケル リンカイ ヒョウメン チョウリョク ノ ケイジテキ キョドウ

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Abstract

Several types of pressure sensitive adhesives (PSA) were prepared by mixing the emulsion of an acrylic base polymer and the emulsified rosin-based tackifier in varying ratios. After they were adhered on stainless steel plates, and then stored at different temperature, the critical surface tensions (γc) of them were measured with time in the following methods. Two kinds of liquids (water and dipropylene glycohol) having different surface tensions were mixed in varying ratios, and surface tensions of each solution were measured. Then, these solutions were contacted on the surface of PSA to observe the contact angle. Finally γc was calculated on the basis of the contact angles through Zisman-plot. γc of the PSA without tackifier tended to increase remarkably with time, especially for the high temperature storage condition. The PSA containing tackifier which were stored at 23℃ gave substantially constant γc regardless of storage time. In contrast, when they stored at 70℃, γc increased. The results indicated the possible convergence of γc on about 22mN/m irrespective of the concentration of tackifier in PSA. Moreover, it was suggested that critical surface tension also became higher linearly with an increase in the concentration of tackifier on surface layer.The driving force of migration of tackifier toward the surface of PSA was induced by the minimization of the interfacial surface free energy between the PSA and the adherend.

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