Adhesion properties of polyurethane pressure-sensitive adhesive |
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Authors: | Yoshinobu Nakamura Shinji Nakano Keiko Ito Keigo Imamura Syuji Fujii Mariko Sasaki |
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Affiliation: | 1. Department of Applied Chemistry , Osaka Institute of Technology , 5-16-1 Ohmiya, Asahi-ku, Osaka , 535-8585 , Japan;2. Nanomaterials Microdevices Research Center, Osaka Institute of Technology , 5-16-1 Ohmiya, Asahi-ku, Osaka , 535-8585 , Japan nakamura@chem.oit.ac.jp;4. Department of Applied Chemistry , Osaka Institute of Technology , 5-16-1 Ohmiya, Asahi-ku, Osaka , 535-8585 , Japan;5. Nitto Analytical Techno-Center Co. Ltd. , 1-8-5 Hatara, Fukaya, Saitama , 366-8521 , Japan |
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Abstract: | In this study, the adhesion properties of polyurethane (PUR) pressure-sensitive adhesive (PSA) were investigated. The PUR-PSA was prepared by the cross-linking reaction of a urethane polymer consisting of toluene-2,4-diisocyanate and poly(propylene glycol) components using polyisocyanate as a cross-linking agent. The peel strength increased with the cross-linking agent content and exhibited cohesive failure until the maximum value, after which it decreased with interfacial failure. The PUR-PSA exhibited frequency dependence of the storage modulus obtained from dynamic viscoelastic measurements, but did not show dependence of the tack on the rolling rate measured using a rolling cylinder tack test under the experimental conditions used, which is quite different from the acrylic block copolymer/tackifier system. The PUR-PSA showed strong contact time dependence of tack measured by a probe tack test. The tendency was significantly larger than for the acrylic block copolymer/tackifier system. Therefore, the storage modulus increased, whereas the interfacial adhesion seems to be decreased with increase in the rolling rate for this PUR-PSA system. It was estimated that the influence of rolling rate on the interfacial adhesion and the storage modulus was offset, and, as a result, the rolling cylinder tack did not exhibit rate dependency. |
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Keywords: | Pressure-sensitive adhesive (PSA) polyurethane (PUR) cross-linking peel resistance rolling cylinder tack probe tack viscoelasticity pulse NMR |
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