Abstract:
The invention provides a thermoplastic polyurethane having at least one plasticizer, with at least one first plasticizer (i) being based on a glycerol, and at least one hydroxyl group of the glycerol being esterified with a monocarboxylic acid (ii) which contains 1, 2, 3, 4, 5 or 6 carbon atoms, more preferably 2, 3 or 4 carbon atoms and very preferably 2 carbon atoms. The invention further encompasses a process for preparing the thermoplastic polyurethane having the plasticizer (i), a method for coating products with this thermoplastic polyurethane, the use of the thermoplastic polyurethane, and the use of plasticizers based on glycerol for thermoplastic polyurethane.
Abstract:
Method for producing a rigid polymeric foam, comprising the conversion of components A to C in the presence of component D or an isocyanate group-containing pre-polymers of components A and B with component C in the presence of component D, the total quantity of which is 100% by weight, (A) 35 to 65% by weight of at least one polyisocyanate component A, (B) 5 to 50% by weight of at least one polyol component B, (C) 1 to 59% by weight of at least one polycarboxylic acid component C and (D) 0.01 to 3% by weight of at least one Lewis base component D, wherein conversion takes place with the release of carbon dioxide.
Abstract:
The invention relates to polyurethanes on the basis of a thermoplastic polyurethane and an isocyanate concentrate added to the thermoplastic polyurethane, having a functionality larger than 2 and less than 10, wherein the hard phase portion of the thermoplastic polyurethane ranges between 0% and 5%, and the isocyanate concentrate is added in form of at least 2% per weight relative to the polyurethane PU-1.
Abstract:
The invention relates to a method for the hydrolysis of at least one isocyanate adduct, with a hydrolyzing agent, characterized in that the hydrolyzing agent contains water and at least one imidazole of the following structural formula, where R1 is a alkyl group having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, more preferably 1 to 2 carbon atoms, and most preferably having one carbon atom, and R2, R3 and R4 independently of each other are hydrogen (H) or are alkyl groups having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, more preferably 1 to 2 carbon atoms, and most preferably having one carbon atom. The invention further relates to the use of starting substances for the described method.
Abstract:
The invention relates to a method for producing a hard foam, comprising the following steps: at least one polyisocyanate is reacted with a mixture containing at least one polyepoxide, water and at least one additional hydrogen azide compound, said reaction taking place in the presence of a metal-free Lewis base with at least one nitrogen atom, hard foams obtained according to said type of method, and to the use of the claimed hard foam for producing insulating materials, vacuum insulation panels, cooling devices, components, wind rotor blades or elements boat and vehicle construction.
Abstract:
Procedimiento para la producción de granulado expandido a partir de una masa fundida polimérica conteniendo espumante que contiene un poliuretano termoplástico, comprendiendo los pasos: a) presionado de la masa fundida polimérica conteniendo espumante a través de una placa perforada (18) templada a una temperatura entre 150°C y 280 °C en una cámara de granulación (26), b) trituración de la masa fundida polimérica presionada a través de la placa perforada (18) con un dispositivo de corte (20) en granos de granulado en expansión individuales, c) evacuación de los granos de granulado de la cámara de granulación (26) con una corriente de líquido (36), caracterizado porque el espumante contiene CO2 o N2 o una combinación de CO2 y N2 y la cámara de granulación (26) es atravesada por un líquido templado a una temperatura entre 10 °C y 60 °C, cuya presión se encuentra de 0,7 bar a 20 bar por encima de la presión ambiental, donde la presión y la temperatura del líquido en la cámara de granulación (26), así como la temperatura de la placa perforada (18) se seleccionan de tal forma que los granos de granulado en el líquido sometido a presión sean expandidos por el espumante contenido de forma que los granos de granulado expandidos surjan con una piel cerrada, donde la densidad aparente del granulado expandido se encuentra entre 30 g/l y 250 g/l y donde la temperatura del líquido en la cámara de granulación (26) se reduce en una expansión no controlada del granulado, en que no se forma ninguna piel cerrada, y se eleva en una expansión inexistente o demasiado baja del granulado y donde la temperatura de la placa perforada (18 se reduce) en una expansión no controlada del granulado, en que no se forma ninguna piel cerrada, y se eleva en una expansión inexistente o demasiado baja del granulado.