Abstract: A pressure sensitive adhesive composition that includes: a (meth)acrylic ester polymer (A) containing, as a monomer unit constituting the polymer, an ethylene carbonate-containing monomer having an ethylene carbonate structure represented by Formula (1) below; and an ionic compound (B).

Abstract: An adhesive sheet comprising at least a pressure sensitive adhesive layer, wherein the adhesive sheet has an adhesive strength to soda-lime glass of larger than 1 N/25 mm and 100 N/25 mm or less, a pressure sensitive adhesive that constitutes the pressure sensitive adhesive layer is formed of a pressure sensitive adhesive composition that contains a (meth)acrylic ester polymer (A), and the (meth)acrylic ester polymer (A) contains, as a monomer unit that constitutes the polymer, an ethylene carbonate-containing monomer having an ethylene carbonate structure represented by Formula (1) below.

Abstract: The invention is a curable composition comprising the following component (A) and component (B): Component (A): a curable polysilsesquioxane compound having a repeating unit represented by the following specific formula (a-1): R1—D—SiO3/2??(a-1) Component (B): a silane coupling agent having a nitrogen atom in its molecule, and a method for producing the curable composition, and a cured product obtained by curing the curable composition, and a method for using the curable composition as an adhesive for an optical element-fixing material, and a method for using the curable composition as a sealant for an optical element-fixing material, and an optical device obtained by using the curable composition as an adhesive or a sealant for an optical element-fixing material. One aspect of the curable composition according to one embodiment of the invention can provide a cured product excellent in adhesiveness and heat resistance and having a low refractive index.

Abstract: A pressure sensitive adhesive sheet is provided which comprises a pressure sensitive adhesive layer formed of a pressure sensitive adhesive composition. The pressure sensitive adhesive composition contains an aliphatic polycarbonate and a pressure sensitive adhesive resin other than the aliphatic polycarbonate. The pressure sensitive adhesive sheet can be reduced in the adhesive strength at desired timing by a novel mechanism of action so that the release of an adherend becomes easy. The above pressure sensitive adhesive composition preferably contains an acid/base generator that generates an acid or a base by applying energy.

Abstract: Provided is an antifouling composition including a tetrafunctional silane-based compound (A) having a specified structure, a trifunctional silane-based compound having a specified structure, and at least one metal catalyst (C) selected from the group consisting of a titanium-based catalyst, an aluminum-based catalyst, a tin-based catalyst, and a zinc-based catalyst, the antifouling composition satisfying the following relational expression (1). 1.5?y?2x+1??Expression (1): In the expression, x indicates the carbon number of an alkyl group that is selected for R2 in the formula (b) representing the silane-based compound (B) and indicates a number of 4 to 22; and y indicates a blending amount ratio (A)/(B) in a molar ratio of the silane-based compound (A) to the silane-based compound (B).

Abstract: The invention is a curable composition comprising the following component (A) and component (B): Component (A): a curable polysilsesquioxane compound having a repeating unit represented by the following specific formula (a-1): R1—D—SiO3/2??(a-1) Component (B): a silane coupling agent having a nitrogen atom in its molecule, and a method for producing the curable composition, and a cured product obtained by curing the curable composition, and a method for using the curable composition as an adhesive for an optical element-fixing material, and a method for using the curable composition as a sealant for an optical element-fixing material, and an optical device obtained by using the curable composition as an adhesive or a sealant for an optical element-fixing material. One aspect of the curable composition according to one embodiment of the invention can provide a cured product excellent in adhesiveness and heat resistance and having a low refractive index.

Abstract: A pressure sensitive adhesive sheet is provided which comprises a pressure sensitive adhesive layer formed of a pressure sensitive adhesive composition. The pressure sensitive adhesive composition contains an aliphatic polycarbonate and a pressure sensitive adhesive resin other than the aliphatic polycarbonate. The pressure sensitive adhesive sheet can be reduced in the adhesive strength at desired timing by a novel mechanism of action so that the release of an adherend becomes easy. The above pressure sensitive adhesive composition preferably contains an acid/base generator that generates an acid or a base by applying energy.

Abstract: Provided is an antifouling composition including a tetrafunctional silane-based compound (A) having a specified structure, a trifunctional silane-based compound having a specified structure, and at least one metal catalyst (C) selected from the group consisting of a titanium-based catalyst, an aluminum-based catalyst, a tin-based catalyst, and a zinc-based catalyst, the antifouling composition satisfying the following relational expression (1). 1.5?y?2x+1??Expression (1): In the expression, x indicates the carbon number of an alkyl group that is selected for R2 in the formula (b) representing the silane-based compound (B) and indicates a number of 4 to 22; and y indicates a blending amount ratio (A)/(B) in a molar ratio of the silane-based compound (A) to the silane-based compound (B).