An adhesive composition contains a urethane oligomer, a diluent monomer and a photoinitiator, in which a weight ratio of heteroatoms in the diluent monomer is adjusted, and a dielectric constant and a dielectric tangent at 15 GHz of an adhesive layer having a thickness of 150 μm after curing are controlled to be within a specific range. The adhesive composition exhibits low dielectric properties suitable for use in an image display device requiring a high frequency band or thinned.

An adhesive composition contains a urethane oligomer, a diluent monomer and a photoinitiator, in which a weight ratio of heteroatoms in the diluent monomer is adjusted, and a dielectric constant and a dielectric tangent at 15 GHz of an adhesive layer having a thickness of 150 μm after curing are controlled to be within a specific range. The adhesive composition exhibits low dielectric properties suitable for use in an image display device requiring a high frequency band or thinned.

Hydrogels are provided that include an antimicrobial agent and a cross-linkable urethane-based polymer (CUP). Such hydrogels may be used for the controlled-release of antimicrobial agents as well as in the manufacturing of wound dressings. Wound dressings are provided that comprise a hydrogel as defined herein.

A thermoplastic polyurethane is the reaction product of a polybutadiene diol, a polyester diol, and a isocyanate component. The polybutadiene diol has a weight average molecular weight (M.sub.w) of from 200 to 20,000 g/mol. The polyester diol has a melting point of from 40 to 90° C. The reactants allow the thermoplastic polyurethane itself to have a melt flow index measured at 120° C. and 22.6 kg of from 0.1 to 200 grams, per 10 minutes as measured according to ASTM 1238. The thermoplastic polyurethane also has a melting point of from 50 to 300° C. The thermoplastic polyurethane is used to form a composite article.

The invention relates to a method for ascertaining a product composition for a mixed chemical product, a series of feature values, which numerically describe feature values in each case of a descriptor of the particular mixed product, being provided, for each first product composition of a plurality of first product compositions, in the case of a plurality of first product compositions for a particular mixed chemical product, each first product composition being characterised by a numerical product distribution for describing the proportions of components of the first product composition, the series of feature values for each mixed product being mapped by first bijective mapping onto a series of mapped feature values, a series of test feature values, which numerically describe in each case a behaviour property of the particular mixed product, being provided for a plurality of second product compositions for a particular mixed chemical product, the series of test feature values for each mixed product being mapped by second bijective mapping onto a series of mapped test feature values, at least the first or the second mapping including a modification, each series of mapped test feature values of a second product composition being assigned to a series of modified feature values of a first product composition, a correlation matrix being ascertained by multivariate analysis of the associated series, a target requirement profile being predefined for describing at last one behaviour property of a target mixed product and a target descriptor profile for describing descriptors of a target product composition being determined on the basis of the target requirement profile and the correlation matrix.

The present invention provides an adhesive composition which is a primerless urethane-based adhesive and has high adhesive force with respect to a polyolefin-based resin. An adhesive composition according to the present invention is a two-liquid type urethane-based adhesive composition comprising: a main agent which comprises (A) a urethane prepolymer having an isocyanate group at the end thereof, (B) a polyfunctional isocyanate compound having an alkoxysilyl group which can be obtained through a reaction of a silane compound having at least two alkoxysilyl groups in one molecule and a polyisocyanate having an isocyanate group at the end thereof and (C1) a first curing catalyst; and a curing agent which comprises (D) a hydrophobic polyol and (C2) a second curing catalyst.

Provided is an adhesive sheet causing neither cracks nor delamination when bonding to a member sheet to form a laminate sheet even when the laminate sheet is folded under low and high temperature environments, and having excellent restorability when the laminate sheet is bent and held under high temperature conditions.

Proposed is an adhesive sheet satisfying the following requirements (1) to (3): (1) the storage shear elastic modulus at 80° C. (G′(80° C.)) obtained by dynamic viscoelasticity measurement in a shear mode at a frequency of 1 Hz is 1.0 kPa or more and 100 kPa or less; (2) the storage shear elastic modulus at −20° C. (G′(−20° C.)) obtained by dynamic viscoelasticity measurement in a shear mode at a frequency of 1 Hz is 1.0 kPa or more and 140 kPa or less; and (3) when the storage shear elastic modulus is measured by dynamic viscoelasticity measurement in a shear mode at a frequency of 1 Hz, the average slope of −20° C. to 80° C., which is represented by formula (1): average slope=(G′(80° C.)−G′(−20° C.))/100, is −0.40 to 0 (kPa/° C.) on a graph where the y-axis represents the storage shear elastic modulus (kPa) and the x-axis represents the temperature (° C.).

There is provided a heat-conductive flexible sheet that is formed of a non-silicone material and excellent in flexibility as well as durability such as heat-aging resistance, hydrothermal resistance, and thermal shock resistance, and a heat dissipation structure using the same, as well as a resin composition that exhibits excellent handleability in the kneading step in producing a heat-conductive sheet and can be suitably used as a binder material for a heat-conductive flexible sheet. A resin composition comprising a blocked urethane prepolymer, a predetermined epoxy compound, and a curing catalyst, the blocked urethane prepolymer being a reaction product of an aliphatic diisocyanate compound and a hydrogenated polybutadiene polyol having a hydroxy group at each of both ends, wherein the reaction product has at an end thereof an isocyanate group blocked with an aromatic hydroxy compound; a heat-conductive flexible sheet formed of a cured product of a mixed composition comprising the same and a heat-conductive inorganic filler; and a heat dissipation structure using the same.

Disclosed is a segmented thermoplastic elastomer that can be a polyurethane, polyurea, or polyurethane-urea comprising soft segments and hard segments, wherein the soft segments are made of polyolefin diols or polyolefin diamine that may have 0 to 1000 carbon atoms in the main chain, wherein each carbon atom in the main chain may have 0 to 2 side chains and each side chain may have 0 to 30 carbon atoms, the hard segment is made of a diisocyante and a chain extender, the hard segments make up 10-60% of the elastomer and the soft segments make up the rest, the number-average molecular weight of the elastomer is 5×10.sup.3-1000×10.sup.3 g/mol, the ultimate elongation of the elastomer is 100-1000%, the Young's modulus is 1 to 3,000 MPa, and the ultimate tensile strength is 10-100 MPa. Also disclosed are a method for preparing the segmented thermoplastic elastomer and use of segmented thermoplastic elastomer.

A medical device, a method for preparation thereof, and use thereof are provided. The medical device comprises a thermoplastic elastomer that is composed of soft segments and hard segments. The method for preparing a medical device comprising a thermoplastic elastomer, comprises forming the thermoplastic elastomer into tubing or other shapes via extrusion, molding, or coating, assembling the tubing or other shapes with other parts including: cables, coils, coated cables, or coated coils, and bonding the tubing, cables, or coils with other components including: other tubing components, cables, coils, sleeves, electrical pulse generator, defibrillation shock generator, electrodes, sensors, or drug release components. The medical device is used for correcting cardiac rhythm, defibrillating, assisting hearts, sensing, stimulating neurological systems, gastrointestinal system, or skeletomuscular tissues or organs.