| 摘要 |
PURPOSE:To provide the title pressure-sensitive adhesive material which does not cause blocking at room temp. and can form a surface having semipermanent adhesion activity by heating, by providing a lower layer consisting of a binder contg. a tackifier and an upper layer consisting of a finely divided solid plasticizer and a binder on a substrate. CONSTITUTION:At least 30wt% tackifier (e.g., hydrogenated rosin having an m.p. of 50-100 deg.C) is added to an org. solvent soln. or aq. dispersion of a binder (e.g., an acrylic resin) to obtain a first soln. Separately, 30-50wt% finely divided solid plasticizer having a particle size of 0.5-10mm and compatibility with the tackifier (e.g., dicyclohexyl phthalate) and a dispersant (e.g., polyoxyethylene phenyl ester) are added to an aq. soln. or dispersion of the binder to obtain a second soln. The first soln. is applied to a substrate composed of synthetic paper and dried to form a lower layer of 5-20mum in thickness. The second soln. is then applied thereto in such an amount that the coated layer contains the solid plasticizer in an amount of 0.4-1.6 times by weight that of the tackifier. The coated layer is dried to form an upper layer.
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