Abstract: A reinforcing film comprises a pressure sensitive adhesive layer laminated and fixed on a principal surface of a film substrate. The pressure sensitive adhesive layer is formed of a photocurable composition containing a photocurable agent and a base polymer having a crosslinked structure. The gel fraction of the photocurable composition is preferably 60% or more. The shear storage elastic modulus at 25° C. of the pressure sensitive adhesive layer is preferably 1×104 to 1.2×105 Pa. The shear storage elastic modulus at 25° C. of the pressure sensitive adhesive layer after photocuring is preferably 1.5×105 to 2×106 Pa.

Abstract: A reinforcing film comprises a pressure sensitive adhesive layer laminated and fixed on a principal surface of a film substrate. The pressure sensitive adhesive layer is formed of a photocurable composition containing a photocurable agent and a base polymer having a crosslinked structure. A frictional force of the pressure sensitive adhesive layer measured with a frictional force microscope at a frequency of 5 Hz is preferably 2 to 5 times a frictional force at a frequency of 0.1 Hz. After photocuring of the pressure sensitive adhesive layer, a frictional force of a photocured pressure sensitive adhesive layer measured with the frictional force microscope at a frequency of 5 Hz is preferably not less than 5 times a frictional force measured at a frequency of 0.1 Hz.

Abstract: A reinforcing film comprises a pressure sensitive adhesive layer laminated and fixed on a principal surface of a film substrate. The pressure sensitive adhesive layer is formed of a photocurable composition containing a photocurable agent and a base polymer having a crosslinked structure. A frictional force of the pressure sensitive adhesive layer measured with a frictional force microscope at a frequency of 5 Hz is preferably 2 to 5 times a frictional force at a frequency of 0.1 Hz. After photocuring of the pressure sensitive adhesive layer, a frictional force of a photocured pressure sensitive adhesive layer measured with the frictional force microscope at a frequency of 5 Hz is preferably not less than 5 times a frictional force measured at a frequency of 0.1 Hz.

Abstract: A reinforcing film comprises a pressure sensitive adhesive layer laminated and fixed on a principal surface of a film substrate. The pressure sensitive adhesive layer is formed of a photocurable composition containing a photocurable agent and a base polymer having a crosslinked structure. The gel fraction of the photocurable composition is preferably 60% or more. The shear storage elastic modulus at 25° C. of the pressure sensitive adhesive layer is preferably 1×104 to 1.2×105 Pa. The shear storage elastic modulus at 25° C. of the pressure sensitive adhesive layer after photocuring is preferably 1.5×105 to 2×106 Pa.

Abstract: Provided is a surface protective film including, as an outermost layer, a pressure-sensitive adhesive layer containing a urethane-based pressure-sensitive adhesive as a main component, the surface protective film allowing the contamination of an adherend to be extremely suppressed, and being preferably excellent in wettability and reworkability. The surface protective film of the present invention includes, as an outermost layer, a pressure-sensitive adhesive layer containing, as a main component, a urethane-based pressure-sensitive adhesive containing a polyurethane-based resin; and when a pressure-sensitive adhesive layer side of the surface protective film is attached to a glass plate at 50° C. for 10 days and then the surface protective film is peeled from the glass plate, a residual adhesive strength on the peeled surface side of the glass plate is 3.0 N/19 mm or more.

Abstract: Provided is a novel surface protective film that can express sufficiently high antistatic property and sufficiently high wettability, and is excellent in reworkability (light peelability). The surface protective film includes a base material layer and a pressure-sensitive adhesive layer, in which the pressure-sensitive adhesive layer contains an ionic liquid or an alkali metal salt.

Abstract: A urethane-based pressure-sensitive adhesive including a polyurethane-based resin, in which: the polyurethane-based resin includes a polyurethane-based resin obtained by curing a composition containing a polyol (A) and a polyfunctional isocyanate compound (B); and the polyol (A) contains a polyol (A1) having 3 OH groups and a number-average molecular weight Mn of 8,000 to 20,000. The urethane-based pressure-sensitive adhesive is excellent in reworkability, initial wettability, and transparency, and is preferably excellent in adhesive residue-preventing property, that preferably has a large wetting rate, and that is preferably prevented from showing external appearance unevenness due to orange peel. Also provided is a surface protective film using such urethane-based pressure-sensitive adhesive in its pressure-sensitive adhesive layer. Further provided is an optical member or electronic member to which such surface protective film is attached.

Abstract: Provided is a novel surface protective film that can express sufficiently high wettability even when no plasticizer is added and that is excellent in reworkability. The surface protective film of the present invention is a surface protective film, including: a base material layer; and a pressure-sensitive adhesive layer, in which a first wetting rate with respect to an acrylic plate in a surface of the pressure-sensitive adhesive layer, which is brought into contact with an adherend, is 5.0 cm2/sec or more.

Abstract: Provided is a surface protective film that uses a polyurethane-based resin in a pressure-sensitive adhesive layer, the surface protective film being able to achieve both of low contamination property and adhesive residue reduction, and having excellent reworkability, wettability, and transparency as well. Also provided are an optical member and an electronic member each having attached thereto such surface protective film.

Abstract: A resin composition includes: a polyol (A) having two or more OH groups; a polyfunctional isocyanate compound (B); and a catalyst (C), in which: the content ratio of the polyfunctional isocyanate compound (B) with respect to 100 parts by weight of the polyol (A) is 1 part by weight to 100 parts by weight; and the catalyst (C) includes an iron complex compound. The resin composition can serve as a pressure-sensitive adhesive composition that is a material for forming a pressure-sensitive adhesive layer containing a polyurethane-based resin, the resin composition showing extremely high reactivity without any use of a tin compound as a catalyst, allowing a cross-linking reaction between a polyol and a polyfunctional isocyanate compound to rapidly progress, and being capable of providing a pressure-sensitive adhesive layer having high transparency. Also provided are a pressure-sensitive adhesive sheet and a surface protective film each including such pressure-sensitive adhesive layer.

Abstract: A surface protective film, including: a backing layer; and a pressure-sensitive adhesive layer, in which: the pressure-sensitive adhesive layer includes a polyurethane-based resin; and the surface protective film has a pressure-sensitive adhesive strength for an acrylic plate of 0.5 N/25 mm or less after being attached to the acrylic plate and stored at 70° C. for 1 day. Another surface protective film including: a backing layer; and a pressure-sensitive adhesive layer, in which: the pressure-sensitive adhesive layer includes a polyurethane-based resin; the polyurethane-based resin includes a polyurethane-based resin obtained by curing a composition including a polyol (A) having at least two OH groups and a polyfunctional isocyanate compound (B); and the polyfunctional isocyanate compound (B) includes a polyfunctional aromatic isocyanate compound.

Abstract: A resin composition includes: a polyol (A) having at least two OH groups; a polyfunctional isocyanate compound (B); a catalyst (C); and a compound (D) that undergoes keto-enol tautomerization, in which: a content ratio of the polyfunctional isocyanate compound (B) with respect to 100 parts by weight of the polyol (A) is 1 part by weight to 100 parts by weight; and the catalyst (C) includes an iron-based compound containing iron as an active center thereof. The resin composition can serve as a pressure-sensitive adhesive composition for forming a pressure-sensitive adhesive layer containing a polyurethane-based resin. Also provided are a pressure-sensitive adhesive sheet and a surface protective film each including such pressure-sensitive adhesive layer.

Abstract: Provided is a novel surface protective film that can express sufficiently high antistatic property even without the use of any antistatic agent, can express sufficiently high wettability even without the use of any plasticizer, and is excellent in reworkability (light peelability). The surface protective film includes: a base material layer; and a pressure-sensitive adhesive layer, in which: the pressure-sensitive adhesive layer has a peeling electrification voltage of 0.7 kV or less; and a first wetting rate with respect to an acrylic plate in a surface of the pressure-sensitive adhesive layer, which is brought into contact with an adherend, is 5.0 cm2/sec or more.

Abstract: Provided is a novel surface protective film that can express sufficiently high wettability even when no plasticizer is used, can prevent the formation of a stop mark, and is excellent in reworkability. The surface protective film is a surface protective film, including: a base material layer; and a pressure-sensitive adhesive layer, in which: a gel fraction of the pressure-sensitive adhesive layer is 70% or more; and a first wetting rate with respect to an acrylic plate in a surface of the pressure-sensitive adhesive layer, which is brought into contact with an adherend, is 5.0 cm2/sec or more.

Abstract: Provided is a novel surface protective film that can express sufficiently high wettability even when no plasticizer is used and that is excellent in reworkability. The surface protective film includes: a base material layer; and a pressure-sensitive adhesive layer, in which an index of deformation of outermost 80 nm of the pressure-sensitive adhesive layer is 0.01 to 0.4 ?N.