There is provided a (meth)acrylic copolymer with which a pressure-sensitive adhesive layer exhibiting excellent low temperature coatability and exhibiting holding power and excellent base material contamination resistance even in a case of being irradiated with a low dose of UV irradiation can be formed. The (meth)acrylic copolymer of the present invention comprises a constituent unit a derived from a macromonomer and a constituent unit b derived from a monomer represented by Formula (b), where a content of the constituent unit b is 0.01% to 25% by mass with respect to a total mass of the (meth)acrylic copolymer. In Formula (b), R.sup.A and R.sup.B each independently represent an alkyl group, a carboxy group, or a halogen atom, n represents an integer of 0 to 5, m represents an integer of 0 to 4, and X represents a (meth)acryloyloxy group or a (meth)acryloyloxyalkyleneoxy group.

The subject matter described herein is directed to molecularly engineered brush-like graft copolymer elastomers and applications thereof. The developed formulation platform is based on the synthesis of brush-like graft copolymer networks with engineered macromolecular architecture composed of brush-like polymers, such as combs and bottlebrush polymers, and block copolymers composed of combinations of brush and linear blocks, with capability of bearing desired chemical functionalities, for example, brush side-chains, chain-ends, and/or brush backbone.

The present disclosure provides an adhesive sheet including an acrylic adhesive layer.

The present disclosure provides an adhesive sheet including an acrylic adhesive layer formed of an adhesive composition comprising an acrylic polymer (A), wherein a stress relaxation rate (X0) is 0.20 or less, where the stress relaxation rate (X0) is calculated by the following equation (I) from an initial modulus of elasticity (G.sub.0(0)) at 0.1 seconds after application of a strain of 25% to the acrylic adhesive layer at a temperature of 70 C. and a relaxation modulus of elasticity (G.sub.0(300)) at 300 seconds after application of a strain of 25% to the acrylic adhesive layer at a temperature of 70 C.:

Stress relaxation rate (X0)=(G.sub.0(300)/G.sub.0(0))(I).

An adhesive formulation may include a functionalized polyolefin having a polyolefin backbone with a molecular weight in a range from 60,000 Da to 90,000 Da, and a solvent or a solvent mixture present in a range from 52 wt % to 82 wt %. The polyolefin backbone is functionalized by addition of a polar side chain to the polyolefin backbone.

A display device of an embodiment includes a display module, a window disposed on the upper side of the display module, a protective layer disposed on the upper side of the window, a housing disposed on the lower side of the display module, and a protective layer adhesive layer disposed between the window and the protective layer, wherein the protective layer adhesive layer includes a polymer compound including multiple polymer main chains and multiple crosslinking parts, the crosslinking parts form multiple crosslinking bonds between the polymer main chains through Diels-Alder reaction, and the crosslinking bonds are separated through Retro-Diels-Alder reaction, thereby showing easy reworkability and excellent or suitable mechanical properties.

The present invention relates to copolymer obtained by polymerizing a monomer mixture comprising: (a) at least one monomer selected from the group consisting of 2-octyl (meth)acrylate, 2-methylbutyl acrylate and 3-methylbutylacrylate; (b) isobornyl (meth)acrylate: (c) optionally at least one carboxyl-functional ethylenically unsaturated monomer; and (d) optionally at least one ethylenically unsaturated monomer other than (a), (b) and (c). A composition comprising the copolymer and its uses in adhesives and coatings are also provided.