The present invention provides an optically clear adhesive sheet having excellent environment resistance using a heat-curable polyurethane composition that has excellent flexibility and is capable of giving a thick film. The optically clear adhesive sheet of the present invention is formed of: a cured product of a heat-curable polyurethane composition, the heat-curable polyurethane composition containing a polyol component, a polyisocyanate component, and a tackifier, the polyol component having an olefin skeleton, the polyisocyanate component being a modified polyisocyanate that is obtained by reacting an acyclic aliphatic and/or alicyclic polyisocyanate containing an isocyanate group with an ether compound containing an ethylene oxide unit.

Non-silicone urea-based adhesives are disclosed which are prepared by the polymerization of reactive oligomers with the general formula XBX, where X is an ethylenically unsaturated group and B is a unit free of silicone and containing urea groups. The reactive oligomers can be prepared from polyamines through chain extension reactions using diaryl carbonates followed by capping reactions. Adhesive articles, including optical adhesive articles may be prepared using the disclosed non-silicone urea-based adhesives.

Provided is a thermosetting adhesive including: a polyurethane; an isocyanate; an epoxy; and a phenoxy resin, in which dynamic viscoelasticity spectrum of a cured product has a peak indicating a softening temperature in an area of 200 C. or higher and has no peak in an area of 160 C. or lower.

A film and a flexible metal-clad laminate obtained with the film. The laminate is improved in post-moisture absorption solderability. The film comprises a heat-resistant polyimide film and, disposed on at least one side thereof, an adhesive layer containing a thermoplastic polyimide. It is characterized in that the thermoplastic polyimide contained in the adhesive layer has crystallinity and that the film, when analyzed with a differential scanning calorimeter, has an endothermic peak attributable to the melting of the crystalline thermoplastic polyimide, the absolute value of the area of the peak being 4.0 mJ/mg or larger. The flexible metal-clad laminate is characterized by comprising the film and a metal layer disposed thereon.

The present invention relates to a self-adhesive article comprising a support layer of foam or similar type and an adhesive layer obtained by cross-linking an adhesive composition. The present invention also relates to a mixture of at least two polymers suitable for use for the manufacture of the self-adhesive article as well as an adhesive composition comprising said mixture of at least two polymers according to the invention.

Heat-curable adhesive composition: (a) a polyurethane composition (A) of formula: ##STR00001## (i) in which R.sup.1 is a hydrocarbon-based radical; R.sup.2 is a polyester block; R.sup.3 is a linear C1-C3 alkylene radical; R.sup.4 and R.sup.5 are a C1-C4 alkyl; m is an integer such that the molar mass of the said polyurethanes is 900-27 000 Da; p=0, 1 or 2;
obtained by producing polyester diols by polycondensation of: (i) dimerized fatty acids with an acid number of 190-200 mg KOH/g with a C2-C44 diol optionally having O or S; or (ii) dimerized fatty alcohols with a hydroxyl number of 200-220 mg KOH/g with a C4-C44 dicarboxylic acid optionally having O or S; (b) 22-62% of a compatible tackifying resin (B); and (c) 0.01-3% of a crosslinking catalyst (C). Self-adhesive support obtained by preheating the adhesive composition, coating onto a support layer and then curing. Manufacture of self-adhesive labels and/or tapes.

In a decorative sheet including a surface layer and an adhesion layer, the surface layer is a polyurethane layer obtained by crosslinking using a curing agent and coating and drying of a straight chain polyurethane resin having a specified molecular weight and acid value, the polyurethane resin being obtained by reaction of a diamine chain extender agent with a polyurethane prepolymer obtained by reaction of a polycarbonate diol having an alicyclic structure, an aliphatic diol having a carboxyl group, and 4,4-cyclohexylmethandiisocyanate.

An adhesive composition and a polarizing plate, the adhesive composition including an isocyanate curing agent and having a creeping distance decrease rate of 10% or less, wherein the creeping distance decrease rate is calculated by Equation 1:
Creeping distance decrease rate (%)=|(AB)/A|100,[Equation 1] wherein, in Equation 1, A and B are creeping distances of an adhesive layer prepared from the composition, when a force of 2.25 kg is applied to a polarizing plate at 25 C. for 1,000 seconds after the polarizing plate formed with the adhesive layer is attached to a glass plate and left at 35 C. and 45% RH for 24 hours and for 36 hours, respectively.

The present invention relates to a self-adhesive article comprising a support layer of foam or similar type and an adhesive layer obtained by cross-linking an adhesive composition. The present invention also relates to a mixture of at least two polymers suitable for use for the manufacture of the self-adhesive article as well as an adhesive composition comprising said mixture of at least two polymers according to the invention.