Provided are a pressure-sensitive adhesive composition, a protection film, an optical laminate, a polarizing plate, and a display device. Provided is the pressure-sensitive adhesive composition which is excellent in various physical properties, such as endurance reliability, has excellent antistatic characteristics that change little over time. The pressure-sensitive adhesive composition can be used for a protection film, or can be used for an optical film, such as a polarizing plate, for example.

This invention provides a sticky cleaner used for removing organic dirt deposited on an article surface. The sticky cleaner comprises a dirt-collecting member that collects the organic dirt upon contact with the article surface. The dirt-collecting member has an acrylic PSA in an area that comes in contact with the article surface. The dirt-collecting member exhibits a hardness of 90 or less in the area that comes in contact with the article surface.

This invention provides a sticky cleaner used for removing organic dirt deposited on an article surface. The sticky cleaner comprises a dirt-collecting member that collects the organic dirt upon contact with the article surface. The dirt-collecting member has an acrylic PSA in an area that comes in contact with the article surface. The dirt-collecting member exhibits a hardness of 90 or less in the area that comes in contact with the article surface.

A laminate is provided which includes a structural body including a base portion and a through hole and which can concurrently satisfy operability and stickiness during processes such as fitting, can be released with no or little adhesive residue, and also exhibits excellent adhesion to various adherends, especially metals. The laminate includes a substrate and a structural body disposed on the surface of at least one side of the substrate, the structural body including a base portion and a through hole. The base portion of the structural body includes an acrylic triblock copolymer (I) that includes two polymer blocks (A1) and (A2) each including methacrylic acid ester units and one polymer block (B) including acrylic acid ester units represented by the general formula CH.sub.2═CH—COOR.sup.1 (1) (wherein R.sup.1 denotes a C1-C3 organic group). The acrylic triblock copolymer (I) has an (A1)-(B)-(A2) block structure and a weight average molecular weight of 50,000 to 250,000. The total content of the polymer blocks (A1) and (A2) is not more than 35 mass % of the acrylic triblock copolymer (I).

A laminate is provided which includes a substrate and a structural body including a base portion and a through hole and which can concurrently satisfy stickiness and releasability and can be released with no or little adhesive residue. The laminate includes a substrate and a structural body disposed on the surface of at least one side of the substrate, the structural body including a base portion and a through hole. The base portion of the structural body includes an acrylic triblock copolymer (I) and no tackifier resins or includes an acrylic triblock copolymer (I) and a tackifier resin in a tackifier resin/(I) mass ratio of not more than 20/100. The acrylic triblock copolymer (I) includes two polymer blocks (A1) and (A2) each including methacrylic acid ester units and one polymer block (B) including acrylic acid ester units represented by the general formula CH.sub.2═CH—COOR.sup.1 (1) (wherein R.sup.1 denotes a C4-C12 organic group). The acrylic triblock copolymer (I) has an (A1)-(B)-(A2) block structure and a weight average molecular weight of 50,000 to 250,000. The total content of the polymer blocks (A1) and (A2) is not more than 35 mass % of the acrylic triblock copolymer (I).

The present application is relates to a pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition of the present application may form a pressure-sensitive adhesive having excellent durability and reliability, stress relaxation and reworkability. In addition, when the pressure-sensitive adhesive composition is used collaterally, for example, a coating process may be efficiently performed even when a coating solid content is high, thereby maintaining excellent productivity and forming a pressure-sensitive adhesive having excellent uniformity in thickness. The pressure-sensitive adhesive composition may be used for an optical film such as a polarizing plate.

The present application is relates to a pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition of the present application may form a pressure-sensitive adhesive having excellent durability and reliability, stress relaxation and reworkability. In addition, when the pressure-sensitive adhesive composition is used collaterally, for example, a coating process may be efficiently performed even when a coating solid content is high, thereby maintaining excellent productivity and forming a pressure-sensitive adhesive having excellent uniformity in thickness. The pressure-sensitive adhesive composition may be used for an optical film such as a polarizing plate.

A modified acrylic block copolymer is obtained by a method comprising subjecting a block copolymer (C) to a reaction with an amine compound, wherein the block copolymer comprises a polymer block (A) comprising a (meth)acrylic acid ester unit (a) and a polymer block (B′) comprising a (meth)acrylic acid ester unit (b′), the (meth)acrylic acid ester unit (a) is structurally different from the (meth)acrylic acid ester unit (b′), thereby partly or entirely converting the (meth)acrylic acid ester unit (b′) into at least one selected from the group consisting of an N-substituted (meth)acrylamide unit (d), a (meth)acrylic acid unit (c), and an N-substituted bis((meth)acryl)amide unit (e).

An example block copolymer may include at least one poly(glucose-6-acrylate) (G6A) block. An example technique may include treating glucose-6-acrylate-1,2,3,4-tetraacetate (GATA) monomer and n-butyl acrylate (nBA) monomer with a free radical initiator in the presence of a chain transfer agent (CTA).

An example block copolymer may include at least one poly(glucose-6-acrylate) (G6A) block. An example technique may include treating glucose-6-acrylate-1,2,3,4-tetraacetate (GATA) monomer and n-butyl acrylate (nBA) monomer with a free radical initiator in the presence of a chain transfer agent (CTA).