Abstract: Air is mechanically entrained in a dyed or colored, aqueous solution comprising surfactant, poly(oxyalkylene) polyisocyanate prepolymer and the reaction product of said prepolymer and one or more isocyanate-reactive dyes, the poly(oxyalkylene) portion of said prepolymer containing sufficient oxyethylene units to render the prepolymer and the reaction product water-soluble and hydrophilic, to form a dyed or colored, fluid, aqueous air foam which is sprayed or otherwise applied to exposed surface of a substrate, e.g. a sanitary landfill, the applied foam gelling or increasing in viscosity, due to the polymerization, e.g.

Abstract: Production of a lightweight, flame retardant, sound absorption composition in the form of a phenol-aldehyde/polyurethane hybrid polymer foam of open cell structure and interconnected continuous porous architecture, by reacting 100 parts by weight phenolic resin, such as a resole resin of an aldehyde and a phenol, e.g. formaldehyde and phenol, having an aldehyde to phenol mole ratio greater than about 1:1; about 50-300 parts by weight aromatic or aliphatic polyisocyanate; about 0-100 parts by weight aliphatic group containing polyol, e.g. a polyether, polyester, polycaprolactone or polybutadiene polyol; and about 0-100 parts by weight filler; in the presence of a catalyst, e.g. a basic and/or metal salt catalyst in an amount of about 0.01-2 parts by weight, and a blowing agent, especially with all reactants but the polyisocyanate being premixed and then combined with the polyisocyanate for reaction in an open mold, e.g. with the resole resin having a pH of about 4.5-9.

Abstract: A new membrane for the separation of aromatic hydrocarbons from mixtures of said aromatic hydrocarbons and non-aromatic hydrocarbons has been prepared comprising a highly aromatic polyurea/urethane membrane. These highly aromatic polyurea/urethane membranes are symmetric, dense film membranes made from the corresponding polyurea/urethane copolymers by standard membrane casting techniques. The polyurea/urethane copolymers are produced by reacting dihydroxy or polyhydroxy compounds, such as polyethers or polyesters having molecular weights in the range of about 500 to 5000 with aliphatic, alkylaromatic or aromatic diisocyanates or polyisocyanates and low molecular weight chain extenders, such as diamines, polyamines or amino alcohols.

Abstract: A reaction system for use in making a reaction injection moulded elastomer, said system comprising the following components:(A) a polyisocyanate composition comprising a reaction product of a stoichiometric excess of an organic polyisocyanate and:(i) a polymeric polyol having an average nominal hydroxyl functionality greater than 2 and an average hydroxyl equivalent weight of from about 500 to about 5000, and(ii) a polymeric polyamine having an average nominal primary and/or secondary amino functionality of from about 2 to about 3 and an average amine equivalent weight of from about 500 to about 5000, the polyol and the polyamine having glass transition temperatures below room temperature.(B) an isocyanate-reactive composition comprising at least one imino-functional compound.

Abstract: Substantially water blown flexible polyurethane foams, based on methylene diphenyl isocyanates, having a density ranging from 15-45 kg/m.sup.3.Such foams may be obtained through a process substantially avoiding halocarbon blowing agents, which comprises reacting methylene diphenyl isocyanates with water and one or more isocyanate-reactive compounds selected from polyols and polyamines with a functionality of 2-4 and an average equivalent weight ranging from 750-5000, while the isocyanate index ranges from 10 to 60, and weight ratio of the isocyanate-reactive compound(s) to water is less than 20.

Abstract: A polyisocyanate composition, suitable for use in the production of elastomers by the RIM process, or foams, said composition being the product of reacting an imino-functional or enamine-containing compound having a molecular weight of at least 1000 with a stoichiometric excess of an organic polyisocyanate.

Abstract: The present invention is directed to a liquid, storage-stable isocyanate prepolymer having an isocyanate group content of from 3 to 30% by weight, prepared by reacting(i) a methyl substituted diisocyanato diphenylmethane with(ii) a polyamine of the structure ##STR1## where R represents an m-valent residue obtained by the removal of m-functional groups from a compound having m-functional groups and having a molecular weight of from 76 to about 10,000,X represents --O--, ##STR2## R.sup.1 represents hydrogen or an inert substituent, R.sup.2 represents hydrogen, a C.sub.1 to C.sub.5 alkyl group or a phenyl group,n is 1 or 2, andm is an integer of from 2 to 8.

Abstract: One component mixtures of tri- and higher functional polyoxyalklyeneamines and aromatic polyisocyanates do not react or react only partially at room temperature and are cured by intimate mixing and heating. They are useful as caulks, sealants, and adhesives, for example.

Abstract: The present invention is directed to polyurethane ureas which may be obtained by the reaction of a hydrophilic NCO prepolymer, which has been prepared from a polyhydroxy component based on about 9 to 100% by weight of a polyether containing about 30 to 100% by weight of ethylene oxide, or a mixture of this hydrophilic NCO prepolymer and a hydrophobic NCO prepolymer, the mixture containing .gtoreq.30% by weight of the hydrophilic prepolymer, with an aldimine or ketimine-containing hardener mixture in the presence of water and organic solvents, approximately 30 to 70% of the NCO groups of the prepolymers being reacted with the amino groups of the hardener and the remainder reacting with water.The present invention is also directed to a process for the preparation of these polyurethane ureas and to coated substrates prepared from these polyurethane ureas.

Abstract: Polyurethane/polyisocyanurate rigid foams having low thermal conductivity are prepared from isocyanate-terminated quasi-prepolymers prepared from polyester polyols derived from phthalic anhydride or from the transesterification of polyethylene terephthalate scrap.

Abstract: The present invention is directed to a reactive mixture for use in preparing a flexible polyurethane foam and to the foams produced therefrom. The reactive mixture broadly comprises(A) from more than 0 up to 3 parts by weight per 100 parts by weight of components (B) and (C) of an amine of the formula:H.sub.2 N--R--NH.sub.2where R is a C.sub.4 to C.sub.10 straight or branched alkylene group, or a C.sub.4 to C.sub.15 alicyclic group,(B) from 0 to 30% by weight of a polyoxyalkylene polyamine having a molecular weight of from about 400 to about 5000 and containing from 2 to 3 primary amino groups, and(C) from 700 to 100% by weight of one or more polyether polyhydroxyl compounds having hydroxyl functionalities from about 2 to 3 and molecular weights of from about 1000 to about 10,000, the percents of components (B) and (C) totalling 100%.

Abstract: The present invention is directed to a process for producing a molded product comprising(A) reacting:(i) an organic polyisocyanate having an isocyanate group content of from 5 to 45% by weight, preferably from 15 to 35% by weight, and most preferably from 20 to 35% by weight, prepared by reacting:(a) an organic di- and/or polyisocyanate, and(b) an active hydrogen containing fatty acid ester prepared by reacting an alcohol or polyol with an aliphatic, saturated or unsaturated fatty acid, said ester being characterized in that at least one aliphatic acid which contains more than 8 carbon atoms is built into the molecule, said ester further characterized as having an acid number of from 0 to 100 and a hydroxyl number of from 0 to 150 with at least one of said numbers being greater than zero, said ester having an average molecular weight of from 500 to 5000,(ii) an isocyanate reactive component comprising:(a) from about 0.

Abstract: A polyisocyanate composition, suitable for use in the production of elastomers by the RIM process, said composition being the product of reacting an alcohol and/or thiol having an average hydroxyl and/or thiol functionality of from about 1.5 to about 4 and an average hydroxyl and/or thiol equivalent weight of at least 500 with at least 2 equivalents, per hydroxyl and/or thiol equivalent, of an organic polyisocyanate under such conditions that at least about 20% of the initially formed urethane and/or thiourethane groups are converted to allophanate and/or thioallophanate groups.

Abstract: Flexible polyurethane foams are prepared using certain high molecular weight, high functionality poly(oxyethylene) compounds as cell openers and softeners. These high functionality polyether polyols have been found to be very effective in opening the cells of the foam, even when used in making foams based on PIPA polyols, which are notoriously closed-celled. They are also quite effective in softening foams made using MDI-based polyisocyanates.

Abstract: Isocyanate-modified poly(alkylene carbonate) polyahls comprising the residue of at least one polyahl, at least one isocyanate modifier, poly(alkyleneoxy) units, poly(alkylene carbonate) units, and a plurality of active hydrogen end groups are disclosed. Also disclosed are isocyanate-functional prepolymer compositions of these isocyanate-modifed poly(alkylene carbonate) polyahls, which contain the residue of at least one isocyanate-modified poly(alkylene carbonate) polyahl of this invention and excess organic polyisocyanate units. Urethane/urea polymers formed by the reactions of the isocyanate-functional prepolymers with polyahls are also disclosed. Also disclosed are urethane/urea polymers comprising the residue of at least one isocyanate-modified poly(alkylene carbonate) polyahl of this invention, the residue of a polyisocyanate and the residue of at least one other polyahl selected from the group consisting of polyamines and polyfunctional hydroxyl compounds.

Abstract: The present invention is directed to a polyisocyanate comprising the reaction product of(a) an isocyanate selected from the group consisting of methylenebis(phenylisocyanate), polymethylenepoly(phenylisocyanate), and mixtures thereof, and(b) a polyester polyol having a hydroxyl functionality of from 2 to 3 and a molecular weight of from about 750 to about 3500, said polyester polyol prepared by reacting neopentyl glycol and adipic acid,the isocyanate group content of said reaction product from about 14% to about 28% by weight. The invention is also directed to a RIM process using such prepolymers.

Abstract: Rigid polyurethane foams are obtained by reacting an isocyanate-reactive component containing at least two isocyanate-reactive hydrogen atoms, having a molecular weight of from 32 to 10,000 or a mixture thereof, with a polyisocyanate composition comprising(a) 30 to 70 pbw of polymethylene polyphenyl polyisocyanate with an iscocyanate content of from 29 to 32%,(b) 30 to 70 pbw of a compound having 30 to 42% by weight isocyanate content obtained by reacting 2,4- and/or 2,6-tolylene diisocyanate with an active hydrogen containing compound, thereafter initiating a reaction in the presence of trimerization catalyst, if necessary diluted with 2,4- and/or 2,6-tolylene diisocyanate,(c) 0 to 30 pbw of other isocyanate compounds in the presence of water and/or organic blowing agents, catalysts and surfactants.

Abstract: A hydrophilic, segmented polyether polyurethane-urea that exhibits an increase in tensile strength and elongation when wet with water and is capable of forming visually clear films permeable to water vapor is disclosed.

Abstract: The present invention relates to polyurethane foam materials with sound insulating and vibration damping properties. They are obtainable by reacting a polyisocyanate or polyisocyanate prepolymers with an excess of polyols or a mixture thereof while maintaining an NCO index of .ltoreq.80, in particular .ltoreq.70 and as a result they have an adhesive (frictional) surface and are further characterized by a density of 80 to 250 kg/m.sup.3, a modulus of elasticity less than 300 OOO N/m.sup.2 and a loss factor of at least 0.4. The production is preferably done by adding the reaction components (polyol system on the one hand and polyisocyanate system on the other) to the mixture head of an RIM machine. The polyurethane soft foam materials with an adhesive surface according to the invention are particularly suitable for use as vibration damping sound insulation systems in automobiles.

Abstract: Ester-modified poly(alkylene carbonate) polyahls comprising the residues of at least one polyahl, polyalkyleneoxy moieties, poly(alkylene carbonate) moieties, the residues of at least one ester of a carboxylic acid, and a plurality of active hydrogen end group are disclosed. The ester-modified poly(alkylene carbonate) polyahl has a number average molecular weight higher than the number average molecular weight of any known poly(alkylene carbonate) polyahl comprising the same monomeric components. Also disclosed are isocyanate-functional prepolymers of these ester-modified poly(alkylene carbonate) polyahls formed by reactions of the ester-modified poly(alkylene carbonate) polyahls of this invention with excess organic polyisocyanates. Urethane/urea polymers formed by the reactions of the isocyanate-functional prepolymers with polyahls are also disclosed.

Abstract: There is disclosed polyurethane reaction mixtures containing a novel aromatic diamine as a curative. This invention is also concerned with cured polyurethanes prepared by reacting the aromatic diamine of this invention with a mixture of organic polyisocyanate and polymeric polyol containing an excess of said polyisocyanate or with a prepolymer of said polyisocyanate and a polymeric polyol. The use of the curative of this invention provides sufficient pot life for making castings as well as foams.

Abstract: The present invention relates to polyurethanes and a method for making polyurethanes by reacting an organic diisocyanate, a glycol having a molecular weight of 500-5000 and a derivative of 2,6-diaminobenzoic acid or a blend comprising derivatives of 2,4-diaminobenzoic acid and 2,6-diaminobenzoic acid. The addition of the 2,6-diaminobenzoic acid derivative to the composition improves polyurethane processability and performance by decreasing chain extender reactivity and increasing hard segment regularity.

Abstract: A makeup remover pad is provided which comprises a resilient, open-celled hydrophilic foam matrix, wherein said matrix integrally incorporates an aqueous phase incorporating about 25-75% water, about 15-70% of a water-insoluble emollient oil, and an amount of surfactant effective to stabilize the aqueous phase so that it is released from the foam matrix as a homogeneous emulsion when the pad is applied to skin.

Abstract: There are provided low temperature, storage stable, liquid mixtures of (1) isocyanato-containing prepolymers obtained from the reaction of linear and/or slightly branched polyols and a polyisocyanate characterized by a methylene group --CH.sub.2 -- bonded to two benzenoid nuclei, and (2) a non-hydroxyl-containing flow modifier which is compatible with the said prepolymer. Novel liquid mixtures thus prepared exhibit little tendency to crystallize or phase separate when stored for prolonged periods of time, i.e., well below room temperature for several days.

Abstract: The present invention is directed to new aromatic diamines containing sulfonic acid aryl esters corresponding to the formula ##STR1## wherein R.sub.1 represents hydrogen, an optionally branched C.sub.1 -C.sub.6 alkyl radical (preferably a methyl group), a C.sub.1 -C.sub.6 alkoxy radical or a halogen atom (preferably chlorine) andR.sub.2 and R.sub.3 which may be the same or different, represent hydrogen, an optionally branched C.sub.1 -C.sub.20 (preferably C.sub.1 -C.sub.6) alkyl radical, a C.sub.1 -C.sub.6 alkoxy radical or a halogen atom (preferably chlorine).The present invention is also directed to a process for the production of the above aromatic diamines containing sulfonic acid esters by the reaction of optionally substituted sulfochlorides with optionally substituted phenols followed by hydrogenation.

Abstract: Air is mechanically entrained in an aqueous solution of surfactant and poly(oxyalkylene) polyisocyanate polymer, the poly(oxyalkylene) portion of which contains sufficient oxyethylene units to render the polymer water-soluble and hydrophilic, to form a fluid, water-based, air foam which is sprayed or otherwise applied to exposed surface of a substrate, such as a body of hazardous material, the applied foam gelling or increasing in viscosity, due to reaction of the polyisocyanate polymer with water to form a poly(oxyalkylene) polyurea polymer, and forming a persistent gelled air foam or viscous air foam in the form of a coating on the exposed surface, thus sealing or otherwise protecting or controlling the substrate.

Abstract: A method for manufacturing polyurethane foam by mixing (a) polyisocyanate, (b) polyol, (c) blowing agent, (d) catalyst and, as required (e) surface active agent, filler, or other such additive, the said method being characterized in that the polyisocyanate (a) is a prepolymer with isocyanate end groups produced from a polyester polyol and a blended polyisocyanate component comprising 45-95 weight % of diphenylmethane diisocyanate and 55-5 weight % of a polymethylene polyphenyl polyisocyanate with a functionality of 3 or more.

Abstract: Polyurethane/polyisocyanurate rigid foams having low thermal conductivity are prepared from isocyanate-terminated quasi-prepolymers prepared from polyester polyols derived from phthalic anhydride or from the transesterification of polyethylene terephthalate scrap.

Abstract: The subject of this invention is elastomers containing polyamide groups and polyurea groups in bonded form, which are prepared by the reaction of(a) at least one organic polyisocyanate and/or a modified polyisocyanate mixture having an NCO content of from 8 to 33.6 weight percent,(b) at least one polyazomethine and(c) at least one alkyl-substituted aromatic polyamine having a molecular weight up to 500,in the presence of or in the absence of(d) catalysts,whereby reaction products of polyoxyalkylenepolyamines, having a functionality of from 2 to 4 and an average molecular weight of from 180 to 10,000 and at least one organic aldehyde and/or preferably ketone, are used as the polyazomethines.

Abstract: Blends of 90-99 mol % of a polyhydroxyalkane containing 2-6 carbons and 2-3 hydroxyl groups and 1-10 mol % of an aromatic diamine having a pKb value greater than 11.3 are useful as chain extenders for polyurethanes derived from diphenylmethanediisocyanate (MDI) prepolymers. Their use overcomes the sensitivity to stoichiometry common to MDI prepolymer/polyhydroxyalkane systems and leads to the formation of cast elastomers having better green strength and a shorter demold time. The preferred blends are blends of 1,4-butanediol and di(alkylthio)toluenediamines.

Abstract: The present invention is directed to a process for the production of polyurethane or polyurea elastomeric molded articles according to the reaction injection molding process by reacting a polyisocyanate, a high molecular weight isocyanate reactive component and optionally a diamine chain extender, wherein the improvement is based on the use of the reaction product of a polyepoxide containing at least two epoxide groups with at least one mol of an aromatic diamine per epoxide group wherein the polyepoxide is present in an amount sufficient to provide about 0.5 to 25% by weight of the polyepoxide based on the weight of all the isocyanate reactive components. The present invention is also directed to the isocyanate reactive components for use in this process and to the molded articles produced in accordance with this process.

Abstract: A micro cellular polyetherurethane foam of the aliphatic diisocyanate type suitable for use in shock absorbers.

Abstract: The present invention is directed to a process for the production of waterproof, fine-cell polyurethane elastomers having a density of about 300 to 800 kg/m.sup.3 by reacting(a) organic polyisocyanates,(b) polyhydroxyl compounds having a molecular weight of about 400 to about 8000,(c) water and, optionally,(d) organic chain-extending agents containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of 32 to 399,the equivalent ratio of isocyanate groups to NCO-reactive groups in the overall formulation being about 0.90:1 to 1.20:1, characterized in that polysiloxane ionomers are added to the water/crosslinker component in concentrations of about 0.1 to 5% by weight, based on the reaction mixture as a whole.

Abstract: Lactones and lactams are utilized in the preparation of urethane modified prepolymers based on diphenylmethane diisocyanate, uretonimine-modified diphenylmethane diisocyanate. The prepolymers are then employed to prepare microcellular foams suitable for shoe soles and cast polyurethane products.

Abstract: Liquid, solventless, complex polymeric compositions are provided which thermoset at ambient temperatures through addition polymerization. In a preferred embodiment, a two component system includes a first component comprising amine or acrylate terminated polyurethanes, polyurethane-ureas or polyureas and a second component comprising di or polyacrylates. By adding an excess of acrylate, a one component system can be formed which thermosets when exposed to ultraviolet radiation.

Abstract: The invention relates to isocyanate-terminated polyurethane prepolymers containing a stoichiometric excess of an isocyanate component comprised of one or more aromatic isocyanates containing on average from 2 to 4 isocyanate groups per molecule and a polyol component comprised of an oleochemical polyol prepared by epoxidation of a triglyceride containing olefinic unsaturation and subsequent ring opening with an alcohol. In use, accelerators, flameproofing agents, blowing agents and, optionally, liquefying agents, dyes and/or stabilizers, are included. The oleochemical polyol does not contain any free epoxide groups and is obtained by complete ring opening of epoxidized triglycerides of a fatty acid mixture containing at least partly olefinically unsaturated fatty acids with one or more C.sub.1 -C.sub.12 alcohols and partial conversion by alcoholysis or transesterification of the triglyceride derivatives to alkyl ester polyols containing from 1 to 12 carbon atoms in the alkyl radical.

Abstract: Rigid polyurethane foams produced by reacting a polyol component having a special composition with an isocyanate component in the presence of a blowing agent, a reaction catalyst and a foam stabilizer with a mold release time of as short as 5.5 minutes or less, have remarkably low thermal conductivity of 12.5.times.10.sup.-3 Kcal/m.hr..degree.C. or less and a low density and are suitable as heat insulating materials for refrigerators and the like.

Abstract: A porous or non-porous intumescent mass comprising one or more carbonization auxiliaries, one or more fillers and optionally one or more other auxiliary agents, produced by the reaction of a polyisocyanate with an isocyanate reactive compound, optionally containing phosphorus or boron, in the presence of polyepoxide. The intumescent mass according to the invention having good fire characteristics and can be used to produce structural elements for fire resistance purposes, fire barriers, textile coatings, linings, laminates and pipe insulators.

Abstract: This invention relates to a reaction injection molded elastomer made by reacting ingredients comprising a high molecular weight polyol or polyoxyalkylene polyamine, a chain extender and a quasi-prepolymer of a polyoxyalkylene polyamine and an aromatic isocyanate.

Abstract: Disclosed is a sculpted, hand-squeezable toy which possesses dimensional memory and has a predetermined dimensional memory restoration time. The toy is made by blending a foamable hydrophilic polyurethane isocyanate-functional prepolymer, a vinyl or acylic polymer emulsion recovery rate modifier, water, and an organic cosolvent. The blend then is charged to a mold for the foamed toy to be made therein. The proportion of organic cosolvent present and the temperature of the blend being molded are variables for determining the predetermined dimensional memory restoration time of the toy after it has been squeezed.

Abstract: A non-liquid, energy-absorbing polyurethane is derived from the process which comprises reacting a mixture of linear and branched polyols, a polyisocyanate and, optionally, a blowing agent, under polyurethane-forming conditions at an isocyanate index of from about 65 to about 85.

Abstract: Disclosed is a mixture of terephthalic acid ester polyols for use in the preparation of rigid polyurethane and polyisocyanurate foams. The polyols are prepared by reacting scrap polyethylene terephthalate, dimethyl terephthalate process residue and an excess of a mixture of glycols.

Abstract: A system for use in making molded polyurethane objects by an open or closed casting process, said system comprising(A) an aromatic polyisocyanate; and(B) an active hydrogen-containing composition comprising(i) a polyhydric alcohol having an average molecular weight in the range of about 1000 to about 8000 and an average functionality of about 2 to about 4;(ii) a polyhydric alcohol having 2 to 12 carbon atoms and an average functionality of about 2 to about 3; and(iii) a secondary monoamine of the formulaR--NH--R'wherein R and R' are independently saturated aliphatic groups having 1 to 20 carbon atoms, provided that said secondary monoamine contains at least 4 carbon atoms.

Abstract: In one aspect, this invention is a polyurethane foam which is the reaction product of a reaction mixture comprising a poly(alkylene carbonate) polyol, a silicone surfactant, a blowing agent, and a polyisocyanate.In another aspect, this invention is an active hydrogen-containing composition comprising a poly(alkylene carbonate) polyol having an equivalent weight from about 100 to about 3000, a blowing agent and a silicone surfactant.

Abstract: Largely alkylated polyamines which may be viewed as low molecular weight polymers of x-amino-y-methylenephenyl are effective curing agents for a diverse class of urethane prepolymers. The resulting polyurethanes are thermosetting polymers with excellent compression set and tensile strength. Because the properties of the resulting polyurethane vary only slightly near the optimum stoichiometry of curing agent-prepolymer, the use of the curing agents of this invention presents the advantage of being very tolerant of operator mixing error.

Abstract: In the preparation of a high resiliency polyurethane foam by reacting a polyisocyanate with a polyurea dispersion-containing polyol based masterbatch composition also containing a tertiary amine catalyst for the polyurethane reaction, the improvement for eliminating cure draft of such stored polyol compositions which comprises employing a catalyst composition consisting essentially of5 to 15 wt% triethylenediamine,20 to 35 wt% 4-(2-dimethylaminoethyl) morpholine,20 to 35 wt% N,N,N',N'-tetramethyl-1,2-diamino-2-methylpropane,10 to 25 wt% bis(dimethylaminoethyl)ether, and5 to 40 wt% of an N-hydroxyalkyl quaternary ammonium acid salt.

Abstract: The present invention relates to a process for the production of urethane modified polyisocyanate preparations having an isocyanate content of 5 to 32% by weight by the reaction of(a) polyisocyanates of the diphenylmethane series or polyisocyanate mixtures of the diphenylmethane series with(b) organic polyhydroxyl compoundsusing an NCO/OH equivalent ratio of from 2.5:1 to 50:1, characterized in that the organic polyhydroxyl compound (b) used are:(b1) urazoles or isocyanurates having OH numbers in the range of from 168 to 721 containing 2 or 3 alcoholic hydroxyl groups and carrying hydroxyalkyl substituents, optionally with ether bridges, on the nitrogen, or mixtures thereof, or(b2) mixtures of the polyhydroxyl compound mentioned under b1) with up to 50 hydroxy equivalents percent of other organic polyhydroxyl compounds.

Abstract: This invention relates to a reaction product of polyoxyalkylene polyamine and an isocyanate wherein the polyoxyalkylene polyamine is present in less than the stoichiometric amount.

Abstract: The present invention is directed to a process for the production of urea- and/or biuret-modified polyisocyanates by reacting organic polyisocyanates with a mixture of high molecular weight isocyanate-reactive compounds and low molecular weight isocyanate-reactive compounds, wherein at least 25% of the isocyanate-reactive groups are primary amino groups. The present invention is further directed to the products obtained by this process and their use for the production of polyisocyanate polyaddition products, especially for the preparation of molded articles by the RIM process.

Abstract: The invention relates to a simplified, economic process for the production of polyamines by the alkaline hydrolysis of compounds containing terminal aromatic and/or aliphatic isocyanate groups (including modified isocyanates or NCO-prepolymers and semi-prepolymers with NCO-contents of from 0.5 to 40% by weight), with strong aqueous bases, direct isolation of the polyamines from the carbamate stage being possible by thermal carbamate decomposition and/or solvent extraction.The invention also relates to the use of the aromatic and/or aliphatic polyamines containing primary NH.sub.2 -groups obtainable by the process according to the invention for the production of polyurethanes, such as optionally cellular polyurethane plastics and polyurethane foams.