Abstract: This invention relates to a process for the preparation of polyurethane resins by the reaction of polyisocyanates with a mixture of various low molecular weight hydroxyaldehydes, hydroxyketones and polyhydric alcohols obtained by an improved process for the condensation of formaldehyde with itself.

Abstract: This invention relates to a process for the production of optionally cellular, elastic, shaped articles having an impervious surface layer of polyurethane-polyurea elastomers by reacting a reaction mixture of organic polyisocyanate, ethylene oxide-tipped polyoxyalkylene polyols, propylene oxide-tipped polyoxyalkylene polyols, catalysts, amine chain extenders and optionally surfactants and blowing agents by the reaction injection molding (RIM) technique.

Abstract: The invention relates to a method and a device for producing a solid-forming or foam-forming flowable reaction mixture by metered injection of flowable reaction components into a mixing zone from which the finished reaction mixture is discharged.

Abstract: This invention relates to solid reaction products of aliphatic, cycloaliphatic or araliphatic mono- and/or polyisocyanates and organic, weakly acid mono- and/or polycarboxylic acids for the production of cellular plastics articles and particularly polyurethane foams. The products of the present invention may also be in the form of mixtures with carboxylic acids. The products are suitable for the production of cellular or porous plastics articles, but are preferably used in the preparation of cellular thermoplastic polyurethanes and semi-rigid and particularly rigid polyurethane integral skin foams having a compact outer skin formed by foaming the reaction mixture in closed molds.

Abstract: The present invention relates to intumescent compositions, which may be foamed, and which are obtained by reacting:(1) polyisocyanates with(2) phosphorus-containing condensation products having at least one hydroxyl group obtainable by condensing (i) primary or secondary aliphatic, cycloaliphatic, aromatic, araliphatic or heterocyclic monoamines and/or polyamines, which mono- or polyamines may contain OH-groups; (ii) carbonyl compounds; and, (iii) dialkyl phosphites, and(3) polyesters containing hydroxyl groups and having OH-numbers of from 140 to 300, obtained by reacting polycarboxylic acids containing from 2 to 10 carbon atoms with at least 2 polyols selected from two different groups of the following three:(a) hydroxyl compounds containing more than three OH groups and having molecular weights of up to 200,(b) hydroxyl compounds containing three OH groups and having molecular weights of up to 150,(c) hydroxyl compounds containing two OH-groups and having molecular weights of up to 80, with the proviso tha

Abstract: This invention relates to a process for the preparation of compounds which contain s-triazine units and isocyanate groups or isocyanate-reactive groups and which melt without decomposition, by the reaction of triisocyanates containing s-triazine units with compounds containing isocyanate-reactive groups, and the use of these products as fillers which can be chemically fixed in the production of polyurethanes by the isocyanate polyaddition process.

Abstract: The instant invention is directed to a process for the production of an aromatic isocyanate containing aromatically bound sulfochloride groups, comprising:(I) reacting(a) an isocyanate or carbamic acid chloride which contains at least one aromatically bound isocyanate group and/or at least one aromatically bound carbamic acid chloride group, successively or simultaneously at 0.degree. to 170.degree. C. with(b) a sulfonating agent and(c) an organic compound containing at least one aromatically bound trihalo methyl group and(II) removing hydrogen chloride from the reaction mixture at 20.degree. to 170.degree. C.

Abstract: This invention relates to mixtures of polyols which are liquid at room temperature with functional aldoximes as blowing agents, wherein the aldoxime groups react with polyisocyanates to liberate carbon dioxide and are simultaneously incorporated by means of the functional group thereof into the polyurethane formed. The present invention also relates to a process for the production of polyurethane foams using these incorporated reactive blowing agents as the primary blowing agent in combination with blowing agents known in polyurethane chemistry. The process according to the invention described herein is suitable for the production of various polyurethane foams or cellular polyurethane elastomers, particularly including the production of semi-rigid and rigid polyurethane integral skin foams which are obtained by foaming the reaction mixture in closed molds.

Abstract: This invention relates to an improved method of producing impermeable cellular polyurethane elastomers from polyisocyanates, relatively high molecular weight polyhydroxyl compounds and water as chain lengthening and blowing agent to which additional chain lengthening agents may be added and it is characterized by the use of certain silicone derivatives. The new method makes it possible for impermeable cellular molded articles to be produced without the necessity of forming a skin on the surface, of the kind known, for example, in integral skin foams.

Abstract: The instant invention relates to a process and an apparatus for the production of a foamable mixture from at least two fluid, foam forming reactants and aggregates, in which the aggregate is added to one of the reactants and the resulting preliminary mixture is then mixed with the other reactant.

Abstract: The instant invention is directed to a process for the continuous preparation of polyisocyanates containing uretdione groups comprising dimerizing aromatic polyisocyanates which are free from uretdione groups in the presence of catalysts which accelerate the dimerization of isocyanates, at -30.degree. to 90.degree. C.

Abstract: The present invention relates to a process for the preparation of polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting:(a) polyisocyanate,(b) a compound having a molecular weight of from 400 to 10,000 containing at least two isocyanate-reactive hydrogen atoms and(c) a dialkoxy-phosphonyl-N-alkyl-formic acid amide of the formula: ##STR1## wherein m represents an integer of from 1 to 3,n represents an integer of from 0 to 8,X represents halogen, hydrogen, C.sub.1 to C.sub.6 alkyl, --OR, or ##STR2## R represents C.sub.1 to C.sub.6 alkyl, R.sub.1 represents hydrogen, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkylene, C.sub.6 to C.sub.10 aryl or C.sub.6 to C.sub.10 arylene, andR.sub.2 and R.sub.3, which may be the same or different, represent C.sub.1 to C.sub.10 alkyl in the presence of water and/or blowing agent.The present invention also relates to dialkoxy-phosphonyl-N-formic acid amides.

Abstract: This invention relates to solutions of polyisocyanate polyaddition products with a solids content of from 5 to 70% by weight ofA. Reaction products of(a) polyisocyanates,(b) hydrazines and/or polyamines and/or dihydrazides and/or ammonia and/or urea and/or low molecular weight polyols,(c) optionally higher molecular weight polyols and(d) optionally formaldehyde inB. polyhydric alcohols having a molecular weight of between 62 and 450.

Abstract: The present invention relates to a process for the in situ preparation of stable dispersions of polyisocyanate polyaddition products in hydroxyl-containing compounds as dispersing agents, by a process which comprises reacting1. organic polyisocyanates with2. compounds having primary and/or secondary amino groups and/or primary hydroxyl groups and/or ammonia in3. compounds having at least one hydroxyl group,compounds 3 having secondary hydroxyl groups if compounds 2 have primary hydroxyl groups and wherein the starting components are reacted together in the presence of more than 4% by weight of water, based on the reaction mixture including water, the process being characterized in that the polyisocyanate polyaddition reaction is carried out in the presence of a polymer latex or in the solution of an ionic, linear polyurethane. If desired, the water is subsequently removed in known manner. The invention also relates to the use of the dispersions made by this process in preparing polyurethane resins.

Abstract: The present invention relates to a process for the "in situ" preparation of stable dispersions of polyisocyanate polyaddition products in hydroxyl containing compounds as dispersing agents which comprises reacting1. organic polyisocyanates with2. compounds having primary and/or secondary amino groups and/or primary hydroxyl groups in3. compounds having at least one hydroxyl group, compounds 3 having secondary hydroxyl groups if compounds 2 have primary hydroxyl groups and at least one of the components 1 or 2 having ionic groups and/or groups capable of salt formation, in the presence of from 2 to 50% by weight of water, based on the total quantity of reaction mixture, the improvement which comprises carrying out the polyisocyanate polyaddition reaction in the presence of a polymer latex or the solution of an ionic polyurethane. The invention also relates to the use of the stable dispersions made by the above process in making polyurethane resins.