Adhesive composition and articles are described comprising a carrier substrate (e.g. release liner or backing) and an adhesive composition disposed on the carrier substrate. The adhesive composition comprises at least 20 wt.% of a polymer; unpolymerized cyclic olefin; and a (e.g. latent) ring opening metathesis polymerization catalyst or precatalyst thereof. The polymer may have a Tg less than 25° C. and/or may be an acrylic polymer. Also described is a method of bonding.

The present invention provides a dual-curable hybrid adhesive composition including a photo-initiator, a thermal initiator, and a thiol group-containing compound, and more particularly, to an adhesive composition which may be cured through a single curing by ultraviolet (UV) light or heat, and where thermal curing proceeds concurrently with UV curing by a heat generated during the UV curing such that even a light shield portion which may not transmit UV light therethrough may be sufficiently cured.

The present invention provides a dual-curable hybrid adhesive composition including a photo-initiator, a thermal initiator, and a thiol group-containing compound, and more particularly, to an adhesive composition which may be cured through a single curing by ultraviolet (UV) light or heat, and where thermal curing proceeds concurrently with UV curing by a heat generated during the UV curing such that even a light shield portion which may not transmit UV light therethrough may be sufficiently cured.

The present invention provides a surface protective film which includes an adhesive layer on one surface of a substrate film, wherein the adhesive layer is a cured product of a composition containing: a urethane-based resin having a photoreactive group at the end or side chain thereof; a monofunctional (meth)acrylate monomer; a crosslinking agent having two or more photoreactive groups at the end thereof; a peel strength adjusting agent; and a photoinitiator, the composition being solvent-free; and the adhesive layer has peel strength of 0.5 gf/in to 10 gf/in, as measured on glass at a peel angle of 180° and a peel rate of 1.8 m/min.

The present invention provides a surface protective film which includes an adhesive layer on one surface of a substrate film, wherein the adhesive layer is a cured product of a composition containing: a urethane-based resin having a photoreactive group at the end or side chain thereof; a monofunctional (meth)acrylate monomer; a crosslinking agent having two or more photoreactive groups at the end thereof; a peel strength adjusting agent; and a photoinitiator, the composition being solvent-free; and the adhesive layer has peel strength of 0.5 gf/in to 10 gf/in, as measured on glass at a peel angle of 180° and a peel rate of 1.8 m/min.

The present invention provides a surface protective film which includes an adhesive layer on one surface of a substrate film, wherein the adhesive layer is a cured product of a composition containing: a urethane-based resin having a photoreactive group at the end or side chain thereof; a monofunctional (meth)acrylate monomer; a crosslinking agent having two or more photoreactive groups at the end thereof; a peel strength adjusting agent; and a photoinitiator, the composition being solvent-free; and the adhesive layer has peel strength of 0.5 gf/in to 10 gf/in, as measured on glass at a peel angle of 180° and a peel rate of 1.8 m/min.

An object of the present invention is to provide a pressure-sensitive adhesive sheet enables a pressure-sensitive adhesive layer to be formed, wherein the pressure-sensitive adhesive layer has a low dielectric constant, is excellent in level difference conformability while maintaining adhesive strength and adhesion reliability at high temperatures, and suitable for laminating a metal mesh film and the like. The pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer containing an acrylic polymer (A) and a hydrogenated polyolefinic resin (B) that exhibits liquid flowability at 25° C. The pressure-sensitive adhesive layer has a dielectric constant at a frequency of 1 MHz of from 2.3 to 3.5. The pressure-sensitive adhesive sheet has a 180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 65° C. of 6 N/20 mm or more. In the pressure-sensitive adhesive sheet, the proportion of the 180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 65° C. to the 180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 25° C. (180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 65° C./180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 25° C.×100) is 30 or more.

An object of the present invention is to provide a pressure-sensitive adhesive sheet enables a pressure-sensitive adhesive layer to be formed, wherein the pressure-sensitive adhesive layer has a low dielectric constant, is excellent in level difference conformability while maintaining adhesive strength and adhesion reliability at high temperatures, and suitable for laminating a metal mesh film and the like. The pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer containing an acrylic polymer (A) and a hydrogenated polyolefinic resin (B) that exhibits liquid flowability at 25° C. The pressure-sensitive adhesive layer has a dielectric constant at a frequency of 1 MHz of from 2.3 to 3.5. The pressure-sensitive adhesive sheet has a 180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 65° C. of 6 N/20 mm or more. In the pressure-sensitive adhesive sheet, the proportion of the 180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 65° C. to the 180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 25° C. (180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 65° C./180° peel adhesive strength to a glass plate at a tensile speed of 300 mm/minute at 25° C.×100) is 30 or more.

An object of the present invention is to provide a pressure-sensitive adhesive composition that enables a pressure-sensitive adhesive layer to be formed, wherein the pressure-sensitive adhesive layer has a low dielectric constant, is excellent in level difference conformability and transparency while maintaining adhesive strength and adhesion reliability at high temperatures, and suitable for laminating a metal mesh film and the like. The pressure-sensitive adhesive composition of the present invention contains an acrylic polymer (A), a mixture of monomer components constituting the acrylic polymer (A) or a partially polymerized product of a mixture of monomer components constituting the acrylic polymer (A), and a hydrogenated polyolefinic resin (B) that exhibits liquid flowability at 25° C. The pressure-sensitive adhesive composition comprises a branched-chain alkyl group having 10 to 24 carbon atoms as a monomer component. The hydrogenated polyolefinic resin (B) has a number average molecular weight (Mn) of 1000 to 5000 and a polydispersity (Mw/Mn) of 2.0 or less. The hydrogenated polyolefinic resin (B) contains at least one selected from the group consisting of a hydrogenated polyolefin and a hydrogenated polyolefin polyol. The pressure-sensitive adhesive composition comprises 3 to 35 parts by weight of the hydrogenated polyolefinic resin (B) based on 100 parts by weight of the acrylic polymer (A).

An object of the present invention is to provide a pressure-sensitive adhesive composition that enables a pressure-sensitive adhesive layer to be formed, wherein the pressure-sensitive adhesive layer has a low dielectric constant, is excellent in level difference conformability and transparency while maintaining adhesive strength and adhesion reliability at high temperatures, and suitable for laminating a metal mesh film and the like. The pressure-sensitive adhesive composition of the present invention contains an acrylic polymer (A), a mixture of monomer components constituting the acrylic polymer (A) or a partially polymerized product of a mixture of monomer components constituting the acrylic polymer (A), and a hydrogenated polyolefinic resin (B) that exhibits liquid flowability at 25° C. The pressure-sensitive adhesive composition comprises a branched-chain alkyl group having 10 to 24 carbon atoms as a monomer component. The hydrogenated polyolefinic resin (B) has a number average molecular weight (Mn) of 1000 to 5000 and a polydispersity (Mw/Mn) of 2.0 or less. The hydrogenated polyolefinic resin (B) contains at least one selected from the group consisting of a hydrogenated polyolefin and a hydrogenated polyolefin polyol. The pressure-sensitive adhesive composition comprises 3 to 35 parts by weight of the hydrogenated polyolefinic resin (B) based on 100 parts by weight of the acrylic polymer (A).