Abstract: Rigid polyurethane foams or rigid polyisocyanurate foams with low brittleness are produced by the reaction of polyisocyanate polyetherester polyols based on aromatic dicarboxylic acids obtained by esterification of a dicarboxylic acid composition containing aromatic dicarboxylic acids and aliphatic dicarboxylic acids, fatty acids, aliphatic or cycloaliphatic diols having 2 to 18 carbon atoms or alkoxylates thereof, and a polyether polyol having a functionality of not less than 2.

Abstract: The present invention relates to a process for preparing rigid polyurethane foams or rigid polyisocyanurate foams by using certain polyetherester polyols B) based on aromatic dicarboxylic acids, optionally further polyester polyols C), which differ from those of component B), and polyether polyols D), wherein the mass ratio of total components B) and optionally C) to component D) is less than 1.6. The present invention also relates to the rigid foams thus obtainable and to their use for producing sandwich elements having rigid or flexible outer layers. The present invention further relates to the underlying polyol components.

Abstract: A process for producing a rigid polyurethane foam by reacting (a) an organic polyisocyanate with (b) a compound having at least two hydrogen atoms that are reactive toward isocyanate groups, in the presence of (c) a blowing agent, (d) a catalyst and, optionally, (e) an auxiliary or additive. Component (b) contains: one or more high-functionality polyether alcohols having functionalities of 3.5 to 5.5 and a hydroxyl number of 400 to 550 mg KOH/g; one or more polyether alcohols based on aromatic and/or aliphatic amines and having functionalities of 3.5 to 4.5 and a hydroxyl number of 350 to 500 mg KOH/g; one or more polyether alcohols having functionalities of 2 to 4 and a hydroxyl number of 150 to 450 mg KOH/g; one or more low molecular weight chain extenders and/or crosslinkers having functionalities of 2 to 3 and a molecular weight of less than 400 g/mol; and optionally water.

Abstract: A process for producing a rigid polyurethane foam by reacting an organic polyisocyanate with a polyol component containing a compound with at least two hydrogen atoms which are reactive toward isocyanate groups in the presence of a blowing agent, a catalyst, and optionally auxiliaries and additives, wherein the polyol component contains, by weight: 20 to 60 parts of a polyether alcohol having a functionality of 3.5 to 5.5 and a hydroxyl number of from 400 to 550 mg KOH/g; 1 to 20 parts of a polyether alcohol based on an aliphatic amine and having a functionality of 3.5 to 4.5 and a hydroxyl number of 450 to 900 mg KOH/g; 10 to 30 parts of a polyether alcohol and/or aromatic polyester alcohol having functionalities of 1.5 to 3 and a hydroxyl number of from 150 to 450 mg KOH/g; and optionally 1 to 5 parts of water.

Abstract: The present invention relates to a polyurethane foam which can be obtained by reacting at least one polyether polyol as component (A), at least one polyether polyol based on at least one amine as component (B), at least one polyester polyol as component (C) and at least one polyisocyanate as component (D), in the presence of at least one catalyst selected from the group consisting of salts of carboxylic acids having from 1 to 20 carbon atoms, amine-comprising compounds and mixtures thereof as component (E) and at least one blowing agent as component (F), wherein the ratio of OCN groups to OH groups (ISO index) is from 140 to 180. The present invention further relates to a process for producing said polyurethane foam, its use for insulation, in particular for the insulation of pipes, and also pipe insulation comprising a polyurethane foam according to the invention.

Abstract: The present invention relates to a novel process for producing polyesteretherols via alkoxylation of polyesterols, and also to the use of the polyesteretherols for producing polyurethanes.

Abstract: The present invention relates to polyester polyols based on aromatic dicarboxylic acids or derivatives thereof and to the use of the polyester polyols for producing polyurethanes.

Abstract: The present invention relates to polyester polyols based on aromatic dicarboxylic acids and their use for producing rigid polyurethane foams.

Abstract: The present invention relates to a radiator body comprising at least one radiant panel having at least one structure suitable for receiving at least one tube, at least one tube located in the structure in order to transport a heating or cooling medium, at least two side parts and at least one layer insulating the radiator body, wherein the ratio of the average cross-sectional area of the at least one radiant panel to the cross-sectional area of the at least two side parts is at least 3 and/or the at least two side parts are each decoupled thermally from the at least one radiant panel, as well as to a method for producing the radiant panel according to the invention and to the use of such a radiant panel for heating or cooling.

Abstract: A process for producing rigid polyurethane foams, in which a mixture of one or more high-functionality polyether alcohols having functionalities of from 3.5 to 5.5 and a hydroxyl number of from 350 to 550 mg KOH/g, one or more polyether alcohols based on aliphatic and/or aromatic amines and having functionalities of from 3 to 4 and a hydroxyl number of from 150 to 800 mg KOH/g, an OH-comprising fatty acid ester and, if appropriate, one or more low molecular weight chain extenders and/or crosslinkers having functionalities of from 2 to 3 and a molecular weight Mw of <400 g/mol is used as polyol component, is described. The rigid polyurethane foams obtained have a good surface quality.

Abstract: The invention relates to a process for producing rigid polyurethane foams by reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms which are reactive toward isocyanate groups in the presence of c) blowing agents, wherein the compounds b) having at least two hydrogen atoms which are reactive toward isocyanate groups comprise at least one aromatic polyester alcohol bi), at least one polyether alcohol bii) having a functionality of from 4 to 8 and a hydroxyl number in the range from 300 to 600 mg KOH/g.

Abstract: The invention relates to a process for preparing rigid polyurethane foams, which comprises reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms reactive with isocyanate groups in the presence of c) blowing agents, wherein said compounds having at least two hydrogen atoms reactive with isocyanate groups b) comprise at least one polyether alcohol b1) having a functionality of 2-8 and a hydroxyl number of 200-800 mgKOH/g, obtained by addition of an alkylene oxide b1b) onto a compound having at least two hydrogen atoms b1a), hereinafter also known as starter substances, reactive with alkylene oxides by using an amine b1c) as catalyst.

Abstract: Polyester polyol comprising the esterification product of a) from 10 to 70 mol % of a dicarboxylic acid composition comprising a1) from 50 to 100 mol % of a material based on terephthalic acid, selected from among terephthalic acid, dimethyl terephthalate, polyalkylene terephthalate and mixtures thereof, a2) from 0 to 50 mol % of phthalic acid, phthalic anhydride or isophthalic acid, a3) from 0 to 50 mol % of one or more dicarboxylic acids, b) from 2 to 30 mol % of one or more fatty acids and/or fatty acid derivatives and/or benzoic acid, c) from 10 to 70 mol % of one or more aliphatic or cycloaliphatic diols having from 2 to 18 carbon atoms or alkoxylates thereof, d) from 2 to 50 mol % of a higher-functional polyol selected from the group consisting of glycerol, alkoxylated glycerol, trimethylolpropane, alkoxylated trimethylolpropane, pentaerythritol and alkoxylated pentaerythritol, wherein at least 200 mmol, preferably at least 500 mmol and particularly preferably at least 800 mmol, of polyols d) havin

Abstract: The invention relates to a process for producing composite bodies comprising at least one covering layer a) and a rigid foam based on isocyanate b), in which the covering layer a) is moved continuously and the starting material for the rigid foam based on isocyanate b) is applied to the covering layer, wherein the application of the liquid starting material for the rigid foam based on isocyanate b) is effected by means of a fixed tube which is provided with orifices and is arranged parallel to the covering layer a) and at right angles to the direction of movement of the covering layer a).

Abstract: The invention relates to polyurethanes which comprise biocides, a process for their preparation and the use thereof for the production of maritime articles which have anti-fouling activity.