PURPOSE: To obtain a self-adhesive with an improved balance between the adhesiveness and the tack by the radical copolymerization of ethylene, a specified alkyl acrylate, a specified macromonomer, and a radical-polymerizable monomer.

CONSTITUTION: A self-adhesive comprising a graft copolymer is obtained by the radical copolymerization of 20-50wt.% ethylene, 20-70wt.% 2-14C alkyl acrylate (e.g. ethyl acrylate), 1-30wt.% macromonomer having a (meth)acryloyl group on one end of the molecule, a number-average molecular weight of 2,000 to 30,000, and a Tg of 20°C or higher, and 0-20wt.% radical-polymerizable monomer (e.g. acrylic acid) in the presence of 0.001-1wt.%, based on the total monomers, radical polymerization initiator and chain transfer agent under a pressure of 500-4,000kg/cm2 at 50-400°C.