A dual-cure adhesive composition that exhibits very low visible light reflectance when in a cured condition. The adhesive is curable by electromagnetic radiation and temperature at or above room temperature. Due to the very low visible light reflectance, the adhesive is particularly applicable to optical products that demand minimal interference with visible light transmission.

A dual-cure adhesive composition that exhibits very low visible light reflectance when in a cured condition. The adhesive is curable by electromagnetic radiation and temperature at or above room temperature. Due to the very low visible light reflectance, the adhesive is particularly applicable to optical products that demand minimal interference with visible light transmission.

The invention relates to a polyurethane composition comprising one first component and one second component, said first component comprising an alkoxylated aromatic diol, a low molecular aliphatic or cycloaliphatic diol, a specific polybutadiene polyol and a specific polyetherpolyol, in specific ratios. The hardened composition is characterized by having good adhesion characteristics, a resistance which is only slightly dependent on the temperature, in the temperature range of −35 to +85° C. and also very high resistances. It is particularly suitable as a structural adhesive for bonding two substrates.

The present invention relates to an adhesive, a preparation method and application thereof, particularly the application for bonding glass fiber composites, and a bonded article obtained by using the adhesive. The adhesive comprises: a polyisocyanate having an isocyanate functionality of not less than 2; an epoxy-modified polyether polyol; a hydroxyl-containing acrylate; a redox catalyst; a silane coupling agent; optionally a polyol containing bisphenol A structure; and optionally a polymer polyol different from the epoxy-modified polyether polyol. The adhesive according to the present invention has the advantages of being insensitive to moisture, good bonding properties and a long pot life.

A release sheet 1 may include a base material 12 and a release agent layer 11 provided on the base material 12. The release agent layer 11 is composed of a cured product of a release agent composition containing 50 mass % or more of a diene-based polymer. Mooney viscosity (ML.sub.1+4 (100° C.)) of the diene-based polymer measured at 100° C. according to HS K6300 is in the range of 25 to 70, and a ratio (T.sub.Cp/ML.sub.1+4 (100° C.)) of the Mooney viscosity (ML.sub.1+4 (100° C.)) and a viscosity (T.sub.Cp) of a toluene solution of the diene-based polymer is 2.2 or less. This makes it possible to provide a release sheet which can sufficiently suppress adverse effects on electric components and the like, which has a small dependence of release force on peel rate and which can suppress the occurrence of zipping phenomenon, and a pressure-sensitive adhesive article having such a release sheet.

The invention provides an adhesive coating material which realizes excellent adhesive strength and moist-heat resistance at the time of bonding a solar cell sealing material and a base sheet, a polyol composition for the coating material, a cured object of the adhesive coating material, an adhesive sheet obtained by being coated with adhesive coating material, and a solar cell module using the sheet. As a polyol component of the adhesive coating material which forms an adhesive layer b in a back sheet E of the solar cell module illustrated in Figure, a hydroxyl group-containing (meth)acrylic resin (I) and unsaturated double bond-containing polyester polyol (II) are used as essential components.

The present invention relates to an adhesive composition containing a polymer, an ionic liquid, and an orientation material, and an adhesive sheet including an adhesive layer formed from the adhesive composition. The adhesive composition can form an adhesive layer that has excellent adhesive strength when no voltage is applied and whose adhesive force is sufficiently decreased by applying a voltage.

A method of producing wood-base panels, especially OSB wood-base panels is provided. The method including the steps of providing wood strands, applying at least one adhesive system to the wood strands having at least one polymer adhesive and at least one nanoparticle below 500 nm, and pressing the wood strands admixed with the adhesive system to form wood-base panels.

To provide an adhesive film by which air bubbles formed at a bonding interface when the adhesive film is used for bonding, readily disappear under normal temperature and normal pressure.

One embodiment of the adhesion film of the present invention is characterized by having at least one adhesive layer, wherein the adhesive layer satisfies the following requirements (a) to (c). (a) A diffusion coefficient of nitrogen gas is at least 1.5×10.sup.−6 cm.sup.2/sec. (b) A shear modulus G′ (1 Hz) is from 5×10.sup.2 to 1.0×10.sup.5 Pa, at a measurement temperature of 25° C. and a frequency of 1 Hz. (c) The adhesive layer has an absorption peak at from 800 to 820 cm.sup.−1 and no absorption peak at from 1,000 to 1,020 cm.sup.−1, in an infrared absorption spectrum.

A polyurethane adhesive composition that includes a polyurethane prepolymer that includes the reaction product of a first polyol component that includes glycerol monoester and a polyisocyanate, and a second polyol. A polyurethane prepolymer that includes the reaction product of glycerol monoester, a hydroxy functional triglyceride, and a poly isocyanate.