| 摘要 |
A pressure-sensitive adhesive for surface-protective films which comprises the following ingredients (A) and (B): (A) a (meth)acrylic ester copolymer obtained by copolymerizing at least the following ingredients (a1) and (a2) (a1) 80 to 99 wt.% alkyl (meth)acrylate in which the alkyl group has up to 12 carbon atoms and (a2) 1 to 10 wt.% 4- hydroxybutyl acrylate or 4-hydroxybutyl methacrylate; and (B) an isocyanate crosslinking agent having a functionality of 3 or higher, the amount of ingredient (B) being 1 to 5 parts by weight per 100 parts by weight of the ingredient (A). The pressure-sensitive adhesive has a gel content of 90 wt.% or higher, a peel force as measured at a peel rate of 300 mm/min of 20 gf/inch or lower, and a peel force as measured at a peel rate of 2,000 mm/min of 50 gf/inch or lower. The pressure-sensitive adhesive for surface-protective films has satisfactory high-rate release properties, changes little in peel force with peel rate, does not foul adherends, and is satisfactory in properties including pot life. |
