The invention relates to a method for producing isocyanurates and isocyanurate-containing polyurethanes, comprising the step of reacting an isocyanate in the presence of a catalyst.

The invention relates to a crystallization stable polyester prepolymers for producing HDI- and PDI-based, solvent free two component (2K)-polyurethane- and/or polyurea coating agents.

An adhesive includes: a urethane prepolymer (A) obtained by reacting a polyol (a) with a polyisocyanate (b) under such conditions that the molar ratio of NCO/OH is 0.5-0.9 and having a molecular-weight dispersion degree [(weight-average molecular weight (Mw))/(number-average molecular weight (Mn)); hereinafter referred to also as Mw/Mn] of 4-12; a polyfunctional polyol (B), and an isocyanate curing agent (C).

A chafe layer for a fluid conduit, wherein the chafe layer consists of thermoplastic polyurethane which contains a polyol, in particular a short-chained, diol as a chain extender and isocyanate. The polyol is a polycarbonate. A fluid conduit, a method for producing a fluid conduit as well as the use of a polyurethane and the use of an ethylene copolymer as an additive.

Problem to be Solved

A thermoplastic polyurethane film that is capable of achieving a stress relaxation property regardless of the type of polyol, while having good pasting workability, as well as a multilayer film using the same, is provided.

Solution

The thermoplastic polyurethane film is constituted by a reaction product obtained by using dicyclohexylmethane diisocyanate (H.sub.12MDI). This enables the thermoplastic polyurethane film and the multilayer film to have a good stress relaxation property regardless of the type of polyol, and to have excellent pasting workability.

A thermoplastic polyurethane (TPU) foam product with high flatness, and a preparation method and a use thereof are provided. The TPU foam product is prepared by processing aliphatic thermoplastic polyurethane (ATPU) beads with a melting range of 20° C. to 50° C. and a melting point of 90° C. to 160° C. by a physical gas foaming process to obtain foamed ATPU beads and heating the foamed ATPU beads with a heat source to make the foamed ATPU beads fused. The TPU foam product with high flatness has a density of 0.08 g/cm.sup.3 to 0.8 g/cm.sup.3 and a flatness value of less than 2 mm, and the flatness value is determined by a fixed-length ruler. The TPU foam product not only has high flatness such that diversified designs are allowed for a surface of the product, but also has high resilience.

A moisture-permeable waterproof fabric includes: a porous moisture-permeable waterproof membrane on at least one surface of a fabric. Polyurethane forming the moisture-permeable waterproof membrane is synthesized using a polyol including a polycarbonate diol having a plant-derived component.

A cleaning blade includes a contact part coming into contact with a member to be cleaned, the contact part being constituted by a member containing polyurethane rubber produced by polymerizing at least a polyol component and a polyisocyanate component. The ratio (M100/Re) of 100% modulus (M100 [MPa]) to rebound resilience coefficient (Re [%]) of the member is 0.25 or more. The rebound resilience coefficient (Re [%]) of the member is less than 25%. The tensile stress at 23° C. and 200% strain of the member is 15 MPa or more.

The invention relates to an adhesive composition, the preparation and use of said composition, and an article obtained by bonding using said composition. The adhesive composition comprises: a. an anionic aqueous polyurethane dispersion, which contains a polyurethane with enthalpy of fusion of at least 3 J/g, wherein the enthalpy of fusion is measured by DSC at 20° C.-100° C. of the first heating curve according to DIN 65467; and wherein said aqueous polyurethane dispersion has a hydroxyl content of 0.001% by weight to 0.085% by weight, relative to the total weight of the aqueous polyurethane dispersion; and b. an aqueous polyacrylate primary dispersion with a hydroxyl content of 0.5% by weight to 1.8% by weight, relative to the total weight of the aqueous polyacrylate primary dispersion; wherein the amount of the aqueous polyurethane dispersion is 30% by weight to 91% by weight, and the amount of the aqueous polyacrylate primary dispersion is 9% by weight to 70% by weight, the above weight percentages being relative to the total weight of the adhesive composition. The adhesive composition of the present invention has good high-temperature resistance.

Disclosed is a polyurethane hot-melt adhesive including: a thermoplastic polyurethane that is a reactant of a raw material including a polymer polyol, a polyisocyanate, and a chain extender, wherein X−Y≥15, where X represents a temperature (° C.) at which the polyurethane hot-melt adhesive has a melt viscosity of 2.0×10.sup.3 Pa.Math.s, and Y represents a temperature at which the polyurethane hot-melt adhesive has a melt viscosity of 1.0×10.sup.5 Pa.Math.s, and the polyurethane hot-melt adhesive has a 100% modulus of 2.5 MPa or more.