Abstract: A sealing material for optical elements with excellent transparency, crack resistance, and heat resistance which can produce a cured product of the sealing material and a sealed optical element are provided.

Abstract: A release sheet is provided. The release sheet comprises: a base material having one surface and the other surface; and a release agent layer provided on the one surface of the base material. The release agent layer contains substantially no silicone compound and is constituted of a polymer material containing a polyolefine-based thermoplastic elastomer of which density is in the range of 0.80 to 0.90 g/cm3. A Young's modulus of the release agent layer is in the range of 0.1 to 0.3 GPa. An arithmetic mean deviation of a profile Ra of the other surface of the base material is in the range of 100 to 1800 nm. This makes it possible to sufficiently suppress adverse effects on electric components and the like, prevent blocking from occurring when the release film is wound up in a rolled form and stored in this state, and exhibit superior releasability. A pressure-sensitive adhesive article is also provided.

Abstract: Disclosed herein is a release sheet including: a base material; and a release agent layer provided on the base material, wherein the release agent layer is formed by curing a material mainly constituted of a diene-based polymer and contains substantially no silicone compound, and wherein Mooney viscosity (ML1+4 (100° C.)) of the diene-based polymer before curing which is measured according to JIS K6300 at a temperature of 100° C. is in the range of 40 to 70. It is preferred that the material before curing is mainly constituted of one or two or more diene-based polymers having a cis-1,4 bond content of 90 to 99%.

Abstract: An adhesive containing a ladder-type polysilsesquioxane which firmly bonds metals and synthetic resins and an adhesive sheet having an adhesive layer formed by using the adhesive on at least one side of a substrate are provided. An adhesive comprises a ladder-type polysilsesquioxane having a recurring unit of the following formula (I) in the molecule, wherein R1 represents a polymerizable functional group, and R2 represents the same group as R1, an alkyl group having 1 to 6 carbon atoms which may have a substituent, an alkoxy group having 1 to 6 carbon atoms which may have a substituent, or a phenyl group which may have a substituent, and the adhesive sheet has an adhesive layer formed by using the adhesive on at least one side of the substrate.

Abstract: A sealing material for optical elements with excellent transparency, crack resistance, and heat resistance which can produce a cured product of the sealing material and a sealed optical element are provided.

Abstract: A sealing material for optical elements with excellent transparency, crack resistance, and heat resistance which can produce a cured product of the sealing material and a sealed optical element are provided.

Abstract: A release agent composition includes a poly(meth)acrylate (A) containing a structural unit (1) represented by the following formula (1); in which R1 represents hydrogen or a methyl group and R2 represents a long-chain alkyl group having 12 to 28 carbon atoms, a liquid polymer (B) and a crosslinking agent (C), wherein at least one of the poly(meth)acrylate (A) and the liquid polymer (B) has a reactive functional group, and the crosslinking agent (C) is a compound having a functional group capable of reacting with the reactive functional group.

Abstract: A film having an antistatic releasing agent layer comprising fiber-shaped carbon and disposed on at least one of the faces of a substrate film, a release film having a releasing agent layer disposed on one face of a substrate and an antistatic layer which comprises a cured product of a resin composition of the active energy ray curing type comprising fiber-shaped carbon or a combination of fiber-shaped carbon and an electrically conductive macromolecular compound and is disposed on the other face of the substrate film, and processes for producing the films. The release films have a relatively small thickness of the antistatic layer, exhibit the stable antistatic function, are excellent in smoothness, do not adversely affect hardening of the resin releasing agent, exhibit the excellent releasing function and provide the excellent productivity.

Abstract: An electrostatic charge on a release sheet is prevented, and thus workability during paying out of a release sheet from a roll is improved. A release sheet 10 comprises a release sheet base 11, an undercoat layer 12 formed on the release sheet base 11, and a release agent layer 13 formed on the undercoat layer 12. The undercoat layer 12 contains a polyolefin-type antistatic agent with specific surface resistance (ASTM D 257) of less than or equal to 109?. The surface resistivity (JIS K 6911) of the release sheet 10 is less than or equal to 1014 ?/square.

Abstract: Providing a non-silicone release sheet that has a good release property and in which blocking does not occur even after long periods of storage in a wound roll-like shape. A release sheet 10 is constructed by laminating an undercoat layer 12 and a release agent layer 13 on a release sheet base 11. The release agent layer 13 is formed of a polyolefin resin composition containing a polyolefin thermoplastic resin having density of 0.800 to 0.905 g/cm3 and polymerized with a multi-site catalyst. In the release agent layer 13, an average modulus of elasticity of the release agent layer at 23° C. in 50 to 1000 nm depths from the surface thereof, as measured by Nano Indentation Method, is 0.1 to 0.3 GPa, and a roughness is formed on the surface so that the surface roughness Ra1 thereof is 100 to 700 nm.

Abstract: A release film that can be used as a carrier film for a green sheet used in a laminated ceramic capacitor is provided. The release film includes a base material having both major surfaces, a releasing agent layer provided on one major surface of the base material, and an antistatic layer provided on the other major surface of the base material, wherein the releasing agent layer and the antistatic layer are mainly composed of the same material, and when the surface roughness of the outer surface of the releasing agent layer is defined as Ra1 [nm] and the surface roughness of the outer surface of the antistatic layer is defined as Ra2 [nm], the relations of Ra1?15 and Ra1?Ra2 are satisfied. The release film is capable of preventing occurrence of blocking when being wound in a rolled form for storage and generation of static electricity when being unwound.

Abstract: A double-faced pressure-sensitive adhesive sheet used for electronic components is provided. The double-faced pressure-sensitive adhesive sheet comprises a pressure-sensitive adhesive layer; a first release sheet including at least a first release agent layer attached to one surface of the pressure-sensitive adhesive layer; and a second release sheet including at least a second release agent layer attached to the other surface of the pressure-sensitive adhesive layer. The first release agent layer is mainly constituted of an olefin-based resin and the second release agent layer is mainly constituted of a diene-based polymer material. When an peeling force of the first release sheet with respect to the pressure-sensitive adhesive layer is defined as “X” [mN/20 mm] and an peeling force of the second release sheet with respect to the pressure-sensitive adhesive layer is defined as “Y” [mN/20 mm], the following relation is satisfied: Y?X?50.

Abstract: The present invention provides a process for producing a polysilsesquioxane graft polymer (1) which includes applying ionizing radiation or heat to a mixture including a polysilsesquioxane compound (2) and a vinyl compound (3), a polysilsesquioxane compound including an iniferter group, and a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet using the polymer. According to the present invention, a process for producing a polysilsesquioxane graft polymer which may be used as a pressure-sensitive adhesive exhibiting excellent heat resistance and cohesive force, and the like are provided. In the formula, A represents a linking group, R1 represents a hydrocarbon group which may have a substituent, R2 represents a hydrogen atom or the like, R3 represents a polar group or the like, R4 represents a hydrogen atom or the like, k1 to k3 represent arbitrary positive integers, 1 to n represent zero or an arbitrary positive integer (excluding the case where “m=n=0”), and Q represents an iniferter group.

Abstract: According to the present invention, there is provided a release agent and a release sheet. The release sheet is composed of a base member and a release agent layer including the release agent. The release agent layer is provided on at least one surface of the base member. The release agent contains a poly(meth)acrylate that includes a mono or polyalkylene glycol (meth)acrylate unit having an alkyl or aryl end group (unit (A)), and an alkyl (meth)acrylate unit (unit (B)). The carbon number of the alkyl group in the unit (B) is from 1 to 30.

Abstract: Provided is a release sheet which is non-silicone-based and has a good releasability from a layer of a pressure sensitive adhesive and which has a stable antistatic property without being influenced by the air environment and is free of bleeding out of ionic substances derived from an antistatic agent. The release sheet is prepared by providing an undercoat layer containing a polyurethane-based resin and 0.1 to 45% by mass of a lithium salt-based antistatic agent and a layer of a rubber-based release agent formed by coating and drying a liquid containing a release agent in order on a substrate.

Abstract: A release sheet is provided. The release sheet comprises: a base material having one surface and the other surface; and a release agent layer provided on the one surface of the base material. The release agent layer contains substantially no silicone compound and is constituted of a polymer material containing a polyolefine-based thermoplastic elastomer of which density is in the range of 0.80 to 0.90 g/cm3. A Young's modulus of the release agent layer is in the range of 0.1 to 0.3 GPa. An arithmetic mean deviation of a profile Ra of the other surface of the base material is in the range of 100 to 1800 nm. This makes it possible to sufficiently suppress adverse effects on electric components and the like, prevent blocking from occurring when the release film is wound up in a rolled form and stored in this state, and exhibit superior releasability. A pressure-sensitive adhesive article is also provided.

Abstract: Disclosed herein is a release sheet including: a base material; and a release agent layer provided on the base material, wherein the release agent layer is formed by curing a material mainly constituted of a diene-based polymer and contains substantially no silicone compound, and wherein Mooney viscosity (ML1+4 (100° C.)) of the diene-based polymer before curing which is measured according to JIS K6300 at a temperature of 100° C. is in the range of 40 to 70. It is preferred that the material before curing is mainly constituted of one or two or more diene-based polymers having a cis-1,4 bond content of 90 to 99%.

Abstract: An adhesive containing a ladder-type polysilsesquioxane which firmly bonds metals and synthetic resins and an adhesive sheet having an adhesive layer formed by using the adhesive on at least one side of a substrate are provided. An adhesive comprises a ladder-type polysilsesquioxane having a recurring unit of the following formula (I) in the molecule, wherein R1 represents a polymerizable functional group, and R2 represents the same group as R1, an alkyl group having 1 to 6 carbon atoms which may have a substituent, an alkoxy group having 1 to 6 carbon atoms which may have a substituent, or a phenyl group which may have a substituent, and the adhesive sheet has an adhesive layer formed by using the adhesive on at least one side of the substrate.

Abstract: A sealing material for optical elements with excellent transparency, crack resistance, and heat resistance which can produce a cured product of the sealing material and a sealed optical element are provided.

Abstract: The present invention provides a process for producing a polysilsesquioxane graft polymer (1) which includes applying ionizing radiation or heat to a mixture including a polysilsesquioxane compound (2) and a vinyl compound (3), a polysilsesquioxane compound including an iniferter group, and a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet using the polymer. According to the present invention, a process for producing a polysilsesquioxane graft polymer which may be used as a pressure-sensitive adhesive exhibiting excellent heat resistance and cohesive force, and the like are provided. In the formula, A represents a linking group, R1 represents a hydrocarbon group which may have a substituent, R2 represents a hydrogen atom or the like, R3 represents a polar group or the like, R4 represents a hydrogen atom or the like, k1 to k3 represent arbitrary positive integers, 1 to n represent zero or an arbitrary positive integer (excluding the case where “m=n=0”), and Q represents an iniferter group.