Bonding Agent Composition, Bonding Film And Surface Protection Film

The invention provides a bonding agent having good anti-static performance, good bonding force balance, durability and reprocessing performance at high-speed area and low-speed area stripping areas and capable of preventing defects due to cracks caused by external stress. The bonding agent comprises, by the use level of 100 parts by weight of (methyl) crylic acid polymer, the bonding agent composition contains 100 parts of (methyl) crylic acid polymer whose acid value is 0.01 to 8.0 and 0.1 to 5 parts of crosslinking agents. The (methyl) crylic acid polymer is composed of 55 to 97.5 parts by weight of (methyl) crylic acid alkyl ester having alkyl whose carbon atom number is 4 to 10, 1 to 30 parts of (methyl) crylic acid alkyl ester having alkyl whose carbon atom number is 14 to 18, 0.1 to 15 parts of hydroxyl-contained polymerism monometer and 0.1 to 2 parts of carboxyl-contained polymerism monometer. The anti-static agent is ion compound whose melting point is 30 to 50 DEG C.