| abstract |
PROBLEM TO BE SOLVED: To provide a heat-peelable pressure-sensitive adhesive film using lignin derived from a plant as a main material and imparting thermosetting properties. A heat-peelable pressure-sensitive adhesive film comprising a pressure-sensitive adhesive layer composed of lignin, a curing agent and a base polymer, and a support, wherein the pressure-sensitive adhesive layer is cured by heating. The lignin is preferably a lignin obtained by separating from the cellulose component and the hemicellulose component by a treatment method using only water and dissolving in an organic solvent, the lignin is soluble in the organic solvent, and the lignin is added to the adhesive layer. It is preferable to contain 10 to 90% by mass. Moreover, it is preferable in the weight average molecular weight of lignin being 100-7000 and the content rate of the sulfur atom in lignin being 2 mass% or less. [Selection figure] None |