There is provided a method for preparing a polyisocyanate composition capable of improving transparency of a product, by mixing a phenol-based stabilizer in an amount of 1 to 1000 ppmw, based on the total weight of aromatic diisocynate, and then, introducing polyhydric alcohol to conduct a polymerization reaction, thereby inhibiting coloration and whitening due to oxygen or moisture during synthesis and purification processes.

Briefly, the present disclosure provides a film, tape or outer layer of a composite part comprising: a) at least one layer comprising a crosslinked polymer selected from the group consisting of crosslinked polyurethane, crosslinked polyurea, and crosslinked mixed polyurethane/polyurea polymer; and in some embodiments b) an adhesive layer. In some embodiments the layer additionally comprises a non-crosslinked polymer forming a semi-IPN with the crosslinked polymer. In some embodiments the non-crosslinked polymer may be selected from the group consisting of polyurethane, polyurea, and mixed polyurethane/polyurea polymer. In some embodiments the crosslinked polymer may additionally comprise an acrylate-containing component.

To provide a film which is excellent in releasing property with respect to a resin sealed portion and excellent in low migration property and peeling property with respect to a semiconductor chip, a source electrode or a sealing glass and which is suitable as a mold release film for producing a semiconductor element having a part of the surface of a semiconductor chip, source electrode or sealing glass exposed. A film 1 which comprises a substrate 3 and an adhesive layer 5, wherein the storage elastic modulus at 180° C. of the substrate 3 is from 10 to 100 MPa, and the adhesive layer 5 is a reaction cured product of a composition for adhesive layer comprising a specific acrylic polymer and a polyfunctional isocyanate compound, wherein the number of moles M.sub.OH of hydroxy groups and the number of moles M.sub.COOH of carboxy groups, derived from the acrylic polymer, and the number of moles M.sub.NCO of isocyanate groups derived from the polyfunctional isocyanate compound, satisfy a specific relation, and which is suitable as a mold release film for producing a semiconductor element.

Provided are a pressure-sensitive adhesive composition, a pressure-sensitive adhesive optical laminate, a pressure-sensitive adhesive polarizing plate and a display device. The pressure-sensitive adhesive composition offers a pressure-sensitive adhesive that has excellent durability and processability in manufacturing due to increased hardness even when the pressure-sensitive adhesive layer is formed thinner than a typical adhesive composition, and that can prevent a pressure mark and leakage of the pressure-sensitive adhesive, as well as a bending problem generated when applied on an optical member such as a polarizing plate, etc.

A reactive PSA film that includes: (a) a polymeric film former matrix; (b) one or more reactive components; and (c) a reagent selected from an initiator, a curing agent and an activator. The component (b) is present at a mass fraction of 30%, as based on the sum of (a), (b) and (c). Further, ≥50 wt % of the polymer film former matrix is a crystallizable polymer which: (i) exhibits a crystallization enthalpy of <1 J/g in a DSC measurement on cooling at 10 K/min from at least 30K above a peak temperature of the melting peak of the matrix and ≥100° C.; and (ii) exhibits a crystallite fusion enthalpy of ≥15 mJ/mg in its pure state in a first heating curve of a DSC measurement at 10 K/min and after storage for ≥ one month from 15 to 25° C. and relative humidity from 30 to 70%.

A process for creating an assembly with a pressure sensitive adhesive includes the application of a light curable composition to a first substrate of the assembly. The light curable composition is cured with a single light exposure step to form a fully polymerized pressure sensitive adhesive. The resulting pressure sensitive adhesive is brought into contact with to a second substrate with sufficient force to bond the second substrate to the first substrate to complete the assembly with the pressure sensitive adhesive.

Described herein is a polyester polyol, which is derived from a first reaction product of (a) a Component A, wherein the Component A is a phthalic acid, a phthalic anhydride or mixtures thereof, (b) a Component B, wherein the Component B is a dimer fatty acid, a dimer fatty acid diol or mixtures thereof, and (c) a Component C, wherein the Component C is an aliphatic diol, an aromatic diol, or mixtures thereof, wherein Component C comprises 2 to 10 carbon atoms and optionally catenated heteroatoms selected from O, S, and N. Also disclosed herein are polyurethane polymers and pressure sensitive adhesives made from the polyurethane polymers or the polyester polyols.

To provide a polyurethane prepolymer whereby a pressure-sensitive adhesive having excellent moisture permeability and also having both low adhesion to skin and high adhesion to a substrate can be obtained, a pressure-sensitive adhesive, an adhesive skin patch, a pressure-sensitive adhesive tape, a wearable device and a wearable device kit.

A hydroxy group-terminated polyurethane prepolymer which is obtained by reacting an oxyalkylene polymer A having an average number of hydroxy groups per molecule of from 2.1 to 3, an oxyalkylene polymer B having one hydroxy group per molecule, and a diisocyanate compound, wherein the number average molecular weight of the oxyalkylene polymer B is at least 5,000, and the content of ethylene oxide units in the hydroxy group-terminated polyurethane prepolymer is more than 10 mass %, a pressure-sensitive adhesive, an adhesive skin patch, a pressure-sensitive adhesive tape, a wearable device and a wearable device kit.

Novel compositions and systems for closure of wounds with antimicrobial effectiveness are disclosed. The compositions provide devices of improved flexibility and elasticity and are readily applied to wound sites or over wound closure devices. The present invention is also directed to a novel platinum catalyst for use in such compositions. The catalyst provides for rapid curing on topical surfaces such as skin and bonds to such surfaces in about 2-5 minutes.

A pressure-sensitive adhesive tape for molding a plastic lens having a substrate and a pressure-sensitive adhesive layer formed on a surface of the substrate. The pressure-sensitive adhesive layer includes an acrylic copolymer having a functional group and a crosslinking agent capable of reacting with the functional group; the acrylic copolymer has a weight-average molecular weight (M.sub.w) of 1,100,000 or more and a molecular-weight polydispersity (M.sub.w/M.sub.n) of 10.0 or less; the pressure-sensitive adhesive layer has an elution percentage of 48.0% or less when immersed for two hours in toluene the temperature of which being adjusted to 80° C.; the pressure-sensitive adhesive tape exhibits a shift length of 0.15 mm or more and 0.50 mm or less after 800 minutes in a creep test; and the plastic lens has a refractive index of 1.59 or more.