Abstract: A PSA composition comprising a block copolymer of a monovinyl-substituted aromatic compound and a conjugated diene compound, a tackifier resin, and a softening agent is provided. The tackifier resin comprises a natural product-based tackifier resin (A) having a softening point higher than 80° C. and containing no aromatic ring, and a petroleum-based tackifier resin (B) having a softening point higher than 100° C. and containing an aromatic ring. The content of the tackifier resin (A) is 40 to 120 parts by weight, the content of the tackifier resin (B) is 5 to 40 parts by weight, the total amount of the tackifier resin is 60 to 160 parts by weight, and the content of the softening agent is 5 to 40 parts by weight with respect to 100 parts by weight of the block copolymer, with respect to 100 parts by weight of the block copolymer.

Abstract: A surface modification sheet (X) of the present invention includes a release sheet (10) and a surface modification layer (20) thereon. The surface modification layer (20) contains a polymer having a side chain containing an ethylenic double bond. The side chain of the polymer preferably includes a unit derived from an isocyanate compound containing the ethylenic double bond.

Abstract: A pressure sensitive adhesive includes an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment. In the acryl-based base polymer, the content of the urethane-based segment is 3 to 20 parts by weight based on 100 parts by weight of the acryl-based segment. A pressure sensitive adhesive sheet can be obtained by applying a pressure sensitive adhesive composition on a substrate in a layer form. The pressure sensitive adhesive composition may be curable and may include a polymerization initiator. In formation of the pressure sensitive adhesive sheet, the curable pressure sensitive adhesive composition may be, as necessary.

Abstract: The pressure sensitive adhesive sheet is a sheet shaped pressure sensitive adhesive including an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment, and a content of the urethane-based segment is 3 to 30 parts by weight based on 100 parts by weight of the acryl-based segment. The urethane-based segment includes at least one urethane chain selected from the group consisting of a polyether urethane and a polyester urethane. The content of the urethane-based segment other than the polyether urethane-based segment is 15 parts by weight or less based on 100 parts by weight of the acryl-based segment.

Abstract: The present invention relates to a surface-modifying sheet including a release sheet and a surface-modifying layer, and the surface-modifying layer containing a component that reacts with a thermosetting resin; a surface-modified member, a coated article, a printed article and a joined body, using the surface-modifying sheet; and a method for producing a surface-modified member.

Abstract: The pressure sensitive adhesive sheet is a sheet shaped pressure sensitive adhesive including an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment, and a content of the urethane-based segment is 3 to 30 parts by weight based on 100 parts by weight of the acryl-based segment. The urethane-based segment includes at least one urethane chain selected from the group consisting of a polyether urethane and a polyester urethane. The content of the urethane-based segment other than the polyether urethane-based segment is 15 parts by weight or less based on 100 parts by weight of the acryl-based segment.

Abstract: A pressure sensitive adhesive includes an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment. In the acryl-based base polymer, the content of the urethane-based segment is 3 to 20 parts by weight based on 100 parts by weight of the acryl-based segment. A pressure sensitive adhesive sheet can be obtained by applying a pressure sensitive adhesive composition on a substrate in a layer form. The pressure sensitive adhesive composition may be curable and may include a polymerization initiator. In formation of the pressure sensitive adhesive sheet, the curable pressure sensitive adhesive composition may be, as necessary.