Adhesion properties of polyurethane pressure-sensitive adhesive

作者：Nakamura Yoshinobu^*; Nakano Shinji; Ito Keiko; Imamura Keigo; Fujii Syuji; Sasaki Mariko; Urahama Yoshiaki

来源：Journal of Adhesion Science and Technology, 2013, 27(3): 263-277.

DOI：10.1080/01694243.2012.705516

• Pressure-sensitive adhesive (PSA)
• polyurethane (PUR)
• cross-linking
• peel resistance
• rolling cylinder tack
• probe tack
• viscoelasticity
• pulse NMR

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.

• 出版日期2013-2-1