PURPOSE: To provide the titled composition usable under humid condition, by compounding a thermoplastic acrylate polymer with a dispersant, a petroleum resin and a terpene resin at specific ratios.

CONSTITUTION: The objective composition can be produced by compounding (A) 1pt.wt. of a thermoplastic acrylate polymer (e.g. a copolymer of methyl methacrylate and butyl acrylate) with (B) 0.03W0.5pts. of a dispersant (e.g. polyvinyl alcohol having a saponification degree of 70W98%), (C) 0.01W0.7pts. of a petroleum resin and (D) 0.03W0.7pts. of a terpene resin, as main components. A pressure-sensitive adhesive tape is produced by applying a coating layer of said composition to the surface of a substrate made of cloth, paper or film.