Abstract: The present invention is directed to a polyurethane reactive adhesive compound comprising:A) one or more polyisocyanates having an inactivated particle surface,B) at least one isocyanate reactive compound having a molecular weight MG.sub.w greater than 400, andC) finely dispersed polymer particles, wherein the polymer is solid at temperatures below 70.degree. C. and has a molecular weight MG.sub.w of at least 3000.

Abstract: The present invention is directed to a reactive polyurethane mixture comprising:A) at least one polyisocyanate,B) a polyol mixture comprising:B1) at least one polyol containing three or more hydroxyl groups and having a molecular weight in the range from 800 to 6,000,B2) at least one polyol containing three or more hydroxyl groups and having a molecular weight in the range from 400 to 799 andB3) at least one polyol containing three or more hydroxyl groups and having a molecular weight in the range from 92 to 399, andC) at least one polyamine.

Abstract: The present invention is directed to a polyurethane-based reactive adhesive comprising A) at least one polyisocyanate, B) at least one polyol, and C) at least one polyamine C which is a polyether amine containing at least two amino groups, at least one phenyl group and recurring polyoxyalkylene units.

Abstract: The invention relates to a process for improving the flowability and preventing the agglomeration of finely divided dimerized 2,4-toluene diisocyanate in which a precipitated silicas and/or pyrogenic silica having a hydrophobic surface is added to the finely divided dimerized 2,4-toluene diisocyanate. The invention also relates to the finely divided dimerized 2,4-toluene diisocyanate prepared by this process.

Abstract: The present invention relates to heat-curable reaction systems prepared by mixing (a) solid polyisocyanates (optionally deactivated) having melting points above 80.degree. C., (b) OH- and/or NH.sub.2 -terminated polyoxyalkylene polyethers that have molecular weights of 400 to 10,000 and are liquid at room temperature, (c) solid OH- and/or NH.sub.2 -terminated polyesters that have molecular weights of 400 to 20,000 and are solid at room temperature, and which are thoroughly distributed throughout the mixture but are not homogeneously miscible with the polyether, (d) optional low molecular weight chain-extending agents that contain OH and/or NH.sub.2 groups and have a molecular weight of 62 to 399, and (e) optional catalysts and other auxiliaries. The invention further relates to a method for preparing elastomers, coating compounds, sealing compounds, or adhesives by heat-curing the heat-curable systems.

Abstract: The present invention relates to the preparation of powdered heat-curable reaction mixtures in which melt suspension of (a) solid polyisocyanates having melting points above about 60.degree. C., (b) molten high molecular weight isocyanate-reactive compounds having molecular weights of from 400 to 10,000 that have melting or softening points of 50.degree. C. to 150.degree. C., and (c) optionally, solid or liquid low molecular weight chain-extending or crosslinking compounds having molecular weights of from 62 to 399, are added to an inert solvent containing an emulsifier, thereby forming powdered heat-curable reaction mixtures in which components (a), (b), and (c) remain in uncrossedlinked form. The invention further relates to the use of the heat-curing reaction mixtures for the preparation of high-quality polyurethane polyurea plastics.

Abstract: This invention relates to a process for preparing polyurethane urea elastomers by reacting (a) compounds containing at least two isocyanate-reactive groups and having a molecular weight in the range from about 400 to about 10,000; (b) polyisocyanates; and (c) aromatic diamines corresponding to the formula ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen or alkyl.

Abstract: The present invention is directed to a process for the production of molded polyurethane foams having a compact surface and a density of at least 250 kg/m.sup.3 by the in-mold foaming of a reaction mixture containinga) a polyisocyanate component containing at least one aromatic polyisocyanate,b) an isocyanate-reactive component containing at least one organic compound having at least two isocyanate-reactive groups andc) a blowing agentat an isocyanate index of 75 to 1500, characterized in that organic carboxylic acids are used as blowing agents c), optionally in addition to other chemical or physical blowing agents.The present invention is also directed to the molded polyurethane foams obtained by this process.

Abstract: The present invention is directed to a process for the preparation of N,N'-bis-(3-aminophenyl)-ureas corresponding to formula (I) ##STR1## wherein R represents a linear or branched C.sub.1 -C.sub.6 alkyl group which is in the 2-, 4- and/or 6-position,characterized in that the corresponding phenylene diamines are reacted with urea in a molar ratio of greater than 2:1 in chlorobenzene as solvent.

Abstract: The present invention is directed to the production of free-rise polyurethane foams using sterically hindered diamines of the formula (e) ##STR1## and/or ##STR2## in which R.sup.1 and R.sup.2 may be the same or different and represent C.sub.1 -C.sub.4 -alkyl andR.sup.3 and R.sup.4 may again be the same or different and represent H or CH.sub.3, is added to said reaction mixture.

Abstract: A process for the production of optionally foamed moldings having a compact surface by the reaction in closed molds of a mixture of(a) organic polyisocyanates,(b) compounds containing isocyanate-reactive groups and having a molecular weight of 62 to about 10,000 and(c) mold release agents based on salts of (i) saturated or unsaturated aliphatic or cycloaliphatic carboxylic acids or carboxylic acid mixtures containing (on a statistical average) at least 8 carbon atoms per molecule and (ii) tertiary amines,characterized in that the release agents (c) used are salts in which the amine component (ii) is based on tertiary monoamines or mixtures of tertiary monoamines corresponding to the following formula ##STR1## in which R.sub.1 represents a saturated or unsaturated aliphatic hydrocarbon radical containing at least 12 carbon atoms and R.sub.2 and R.sub.

Abstract: The present invention relates to N,N'-bis-(4-isocyanatocyclohexyl)urea obtained from the reaction with water of cyclohexane-1,4-diisocyanate having a high trans isomer content. This invention further relates to the process for preparing the N,N'-bis(4-isocyanatocyclohexyl)urea and to its use in the synthesis of polyurethanes.

Abstract: Polyurethanes containing uretdione rings are produced by reacting a polyisocyanate containing a uretdione ring with a relatively high molecular weight dihydroxyl compound in the presence of a bismuth salt of an organic carboxylic acid and a low molecular weight aromatic diamine. The low molecular weight aromatic diamine is used in a quantity which is 5 to 10 times the quantity of bismuth salt used. These solid polyurethanes are formed in relatively short reaction times and possess outstanding mechanical properties.

Abstract: The present invention is directed to a process for the production of compact or cellular, elastomeric moldings having a compact skin based on polyurethane urea elastomers prepared from(a) organic polyisocyanates,(b) relatively high molecular weight polyhydroxyl or polyamino compounds containing at least two reactive hydrogen atoms,(c) diaminodiphenyl ureas as chain-extending agents and optionally,(d) catalysts,(e) small quantities of ethylene glycol,(f) other chain-extending agents and/or cross-linking agents,(g) blowing agents and(h) auxiliaries and/or additives, which is characterized in that the chain-extending agents (c) are diaminodiphenyl ureas corresponding to formula I ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 may be the same or different and represent hydrogen or a C.sub.1 -C.sub.6 alkyl radical and wherein the NH.sub.2 groups are in the m- and/or p-position to the urea group.The present invention is also directed to the RIM elastomers produced by this process.

Abstract: The present invention relates to a process for the production of polyurethane urea elastomers from(a) NCO-terminated prepolymers based on polyisocyanates and polyethers having a molecular weight of 400 to about 10,000 and an ethylene oxide content of about 10 to 60 mole-% and(b) solid diaminodiphenyl ureas corresponding to the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be the same or different and represent hydrogen or C.sub.1 -C.sub.6 alkyl radicals and wherein the amino groups are in the m-and/or p-position to the urea group,characterized in that the NCO prepolymers are reacted with the diaminodiphenyl ureas in powder-form in a heterogeneous phase at temperatures of about 5.degree. to 40.degree. C.The present invention is also directed to the polyurethane urea elastomers prepared by this process.

Abstract: High molecular weight amines having reduced low molecular weight amine contents are obtained by reacting a mixture of (1) a high molecular weight amine and (2) a low molecular weight amine with (3) an isocyanate in quantities such that from 0.5 to 10 equivalents of isocyanate are present for each equivalent of low molecular weight amine. The product of high molecular weight amines is particularly useful in the production of isocyanate addition products such as polyurethane plastics and foams.

Abstract: This invention relates to N,N'-bis(5-isocyanatonaphthyl)urea and a process for its preparation by hydrolysis of naphthalene-1,5-diisocyanate. This invention also relates to a method for preparing a polyurethane or polyurea comprising reacting N,N'-bis(5-isocyanatonaphthyl)urea with an NCO-reactive compound.

Abstract: The present invention relates to a process for the production of storable thermosetting polyurethane-polyurea compositions wherein a storable isocyanate component stabilized by a surface coating and a polyol and/or polyamine component are separately prepared. A one-component polyurethane-polyurea reactive mixture is formed by mixing just before the intended use the separate components under mild shear forces at a temperature below the thickening temperature of the final reactive mixture.

Abstract: Polyamines are produced by hydrolyzing isocyanate compounds having an NCO content of from 0.5 to 40 wt. % with from 0.75 to 40 moles of water per equivalent of NCO groups in the presence of from 0.021 to 0.099 wt. % sodium hydroxide and at least 10 wt. % water-miscible polar organic solvent containing nitrile, ketone, sulfoxide or ether groups having a boiling point of from 56.degree. to 250.degree. C. The reaction mixture is maintained in a homogeneous phase. The reaction is carried out at 40.degree. to 170.degree. C. These polyamines are useful in the production of polyurethane(urea)s.

Abstract: Polyamines containing primary amino groups are made by a one-shot process for the hydrolysis of prepolymers containing isocyanate end groups and having an isocyanate content of from 0.5 to 40 weight % with 0.75 to 40 mol of water per equivalent of isocyanate groups in the presence of very small quantities of sodium hydroxide in certain organic, polar solvents. The compounds containing isocyanate groups used for this process are isocyanate prepolymers (preferably containing urethane groups). Hydrolysis according to this process leads directly to the polyamines with elimination of carbon dioxide. These polyamines may be isolated by the usual methods and the removal of the small quantities of catalyst may advantageously be omitted. These polyamines are useful for the preparation of polyurethane(urea)s.