Patent ID: 8685535

Claim:
A surface protective film, provided with a support and a pressure-sensitive adhesive layer provided on a first side of the support, wherein the pressure-sensitive adhesive layer consists of an acrylic polymer as a base polymer thereof, a compound having a polyoxypropylene segment composed of two or more consecutive oxypropylene units, and a crosslinking catalyst, the acrylic polymer is a crosslinked acrylic polymer crosslinked with a crosslinking agent, an amount of the compound having the polyoxypropylene segment composed of the two or more consecutive oxypropylene units is 0.01 to 0.5 parts by weight based on 100 parts by weight of the acrylic polymer, the crosslinking agent is at least one selected from the group consisting of an isocyanate Compound, an epoxy compound, a melamine resin, an aziridine compound and derivatives thereof, the crosslinking catalyst is a tin-based catalyst, and the surface protective film satisfies the following conditions: (A) an indentation strain E 1 of a laminate obtained by laminating 24 of the surface protective films is 7.0% or more, and a ratio (E 1 /E 2 ) of the indentation strain E 1 to a permanent strain E 2 is 30 or less, where the indentation strain E 1 is a reduction ratio of a thickness T 1 to an initial thickness T 0 of the laminate, the thickness T 1 being obtained when the laminate is placed between circular flat surfaces having a diameter of 8 mm, and a compressive stress of 0.195 MPa is applied for 10 minutes in the direction of thickness at 25Â° C., and the permanent strain E 2 is a reduction ratio of a thickness T 2 obtained 10 minutes after the laminate is released from the compressive stress, to the initial thickness T 0 ; (B) during measurement of peel strength carried out under conditions of a measuring temperature of 23Â° C., a peeling speed of 30 m/min and a peeling angle of 180 degrees, a peel strength S 1 of the surface protective film on a triacetyl cellulose polarizing plate that has not been subjected to anti-glare treatment is two times or less a peel strength S 2 of the surface protective film on a triacetyl cellulose polarizing plate that has been subjected to anti-glare treatment.