Abstract: Compounds of formula A(B)x  (I), wherein x is an integer from 1 to 8, A is the radical of a chromophore of the quinacridone, anthraquinone, perylene, indigo, quinophthalone, indanthrone, isoindolinone, isoindoline, dioxazine, azo, phthalocyanine or diketopyrrolopyrrole series that is bonded to x groups B via one or more hetero atoms, those hetero atoms being selected from the group consisting of N, O and S and forming part of the radical A, each group B independently of any other(s) is hydrogen or a group of the formula  at least one group B being a group of the formula The compounds according to the invention are used in high-molecular-weight organic materials, thermo-, photo- or chemo-sensitive recording materials, light-sensitive negative or positive resist compositions, ink compositions for ink-jet printing and color tapes for thermal transfer printing.

Abstract: The invention provides a liquid polyisocyanate prepolymer composition which is a result of combining about 50.0 to 90.0 percent by weight of an isocyanate blend (a.) having 55.0 to 75.0 weight percent 4,4′-MDI, 17.0 to 27.0 weight percent 2,4′-MDI, 1.0 to 10.0 weight percent 3-ring MDI oligomer, and 1.0 to 15.0 weight percent n-ring MDI oligomer (n greater than 3); about 5.0 to 30.0 weight percent of a polyhydroxy containing polyol (b.) having a molecular weight of from 700 to about 6,000; and about 15.0 to 75.0 weight percent of a toluene diisocyanate (c.). The resulting isocyanate prepolymer composition has a free NCO content of from about 30.0 to 45.0 weight percent and particularly desirable flow characteristics. The invention further provides a method of making an isocyanate prepolymer composition, a process of making a polyurethane foam utilizing the isocyanate prepolymer composition of the invention, and polyurethane foams produced by the disclosed process.

Abstract: The present invention provides a method for preparing a fluorochemical composition comprising a urethane by reacting: (A) fluorochemical oligomer of the formula (I): MfmMn—Q1—T1 wherein MfmMn represents a fluorochemical oligomer comprising m units derived from fluorinated monomer and n units derived from fluorine-free monomer and wherein the fluorinated monomers and fluorine-free monomers may be the same or different; m is a value of about 2 to 40; n is a value of about 0 to 20; T1 is an —OH or —NH2 moiety; Q1 and T1 together represent an organic residue obtained by removing a hydrogen atom from a chain transfer agent that is functionalized with T1; (B) monofunctional compound capable of reacting with an isocyanate and comprising a poly(oxyalkylene) group; (C) isocyanate blocking agent or a fluorine-free oligomer; and (D) isocyanate-reactive compound other than said fluorochemical oligomer, said isocyanate blocking agent, said fluorine-free oligomer and said monofunctional compound; wi

Abstract: The invention relates to compounds of formula (I): wherein R1 and R10 are each independently of the other lower alkoxycarbonyl; either R2, R3 and R4 are each independently of the other C1-C4alkyl and R7, R8 and R9 are each selected from hydrogen and C1-C4alkyl, with not more than 2 of the radicals being hydrogen; or R7, R8 and R9 are each independently of the other C1-C4alkyl and R2, R3 and R4 are each selected from hydrogen and C1-C4alkyl, with 1 or 2 of the radicals being hydrogen; R5 is phenyl or cyclohexyl; and R6 is phenyl or cyanophenyl; or salts thereof; those compounds are inhibitors of retroviral aspartate proteases and are effective, for example, against HIV.

Abstract: Amine-terminated urethane oligomer compositions are described that include very high oligomer concentrations. The compositions are melts of the amine-terminated oligomers. The compositions can include one or more property modifiers. The compositions are useful in the formation of crosslinked copolymers, especially with epoxy resins. The resulting copolymers are useful in the formation of coatings.

Abstract: Novel compounds, compositions and methods effective for the prevention and treatment of mast-cell mediated inflammatory disorders are described. The compounds, compositions and methods are effective for the prevention and treatment of inflammatory diseases associated with the respiratory tract, such as asthma and allergic rhinitis, as well as other types of immunomediated inflammatory disorders, such as rheumatoid arthritis, conjunctivitis and inflammatory bowel disease, various dermatological conditions, as well as certain viral conditions. The compounds comprise potent and selective inhibitors of the mast cell protease tryptase. The compositions for treating these conditions include oral, inhalant, topical and parenteral preparations as well as devices comprising such preparations.

Abstract: Carbodiimides based on 1,3-bis(1-methyl-1-isocyanatoethyl)benzene contain from 12 to 40% by weight of ethylene oxide units [—CH2—CH2—O—], based on the weight of the carbodiimides.

Abstract: The present invention relates to compounds containing modified hydrazide groups and corresponding to formula I ##STR1## wherein R represents the residue obtained by removing the isocyanate groups from a monomeric polyisocyanate, a polyisocyanate adduct or an NCO prepolymer,X represents OR' or NHR' andR' represents a group which is inert to isocyanate groups under the conditions used to form the compound of formula I andn has a value of 2 to 6.The present invention also relates to one-component, thermoset coating compositions containing the compounds of formula I and a cross-linking component that is reactive with these compounds. Finally, the present invention relates coatings, sealants and adhesives prepared from these thermoset compositions.

Abstract: A durability enhancing agent comprising the reaction product of an acrylic oligomer or acrylic polymer and an ultraviolet light absorbing compound, a hindered amine light stabilizer or mixture thereof, said durability enhancing agent further comprising more than one carbamate functional group, or group convertible to a carbamate group, and optionally, including other reactive functionality capable of undergoing a crosslinking reaction. Also included is a curable coating composition comprising the durability enhancing agent, a method for obtaining a coated substrate and the coated article obtained thereby.

Abstract: Polyurethane prepolymer which can be converted into a final product by reaction with a curative or chain extending agent is made by reacting polyisocyanate with polyol in the presence of an amount of an aliphatic hydrocarbon which is a solvent for the polyisocyanate but a non-solvent for the prepolymer. In order to minimize the formation of unwanted oligomers the polyisocyanate is present in stoichiometric excess with respect to the polyol and the amount of hydrocarbon solvent present in the reaction mixture is limited so that a single liquid phase is present in the mixture during most of the synthesis. Solvent containing dissolved isocyanate is then removed from the prepolymer by liquid phase separation. A portion of the solvent can be distilled from this isocyanate solution for use in liquid--liquid extraction of residual isocyanate from the prepolymer, and the remaining solution of isocyanate in hydrocarbon solvent can be used in prepolymer synthesis.

Abstract: The present invention provides a liquid methylene bis(phenylisocyanate) composition including a high concentration of methylene bis(phenylisocyanate) which has an improved storage stability. The invention further provides a method of making the liquid methylene bis(phenylisocyanate) compositions of the present invention.

Abstract: Disclosed is a novel blocked polyisocyanate obtained by blocking the terminal isocyanate groups of a non-blocked polyisocyanate with a thermally dissociative blocking agent, wherein the non-blocked polyisocyanate is obtained by reacting at least one diisocyanate selected from the group consisting of an aliphatic diisocyanate and an alicyclic diisocyanate with a polyhydroxy compound having an average number of hydroxyl groups as many as 4.5 to 10, and removing substantially all unreacted diisocyanate monomers. A coating composition comprising the blocked polyisocyanate of the present invention as a curing agent and a polyol as a main agent not only has excellent curability even under low temperature conditions, but is also capable of forming a coating which has excellent impact resistance.

Abstract: The present invention relates to prepolymers, comprising(a) a polymethylene polyphenylene polyisocyanate; and(b) a polyether polyol having an average hydroxyl equivalent weight of at least about 700;wherein the resulting prepolymer has an average viscosity of between about 400 to about 2000 centipoise at 25.degree. C. The prepolymer is useful, for example, for the production of polyurethane foams and, more particularly, to medium density flexible foams having superior flow characteristic and fast demold times.

Abstract: Cellulose-containing, optionally wood-containing materials which have been obtained using water-dispersible polyisocyanates which in turn have been prepared by reaction of the following starting components:a) modified polyisocyanates of the formula (I) ##STR1## in which: R.sup.1 denotes an aliphatic hydrocarbon radical having 2 to 18 carbon atoms; a cycloaliphatic hydrocarbon radical having 4 to 15 carbon atoms; an aromatic hydrocarbon radical having 6 to 15 carbon atoms or an araliphatic hydrocarbon radical having 8 to 15 carbon atoms,R.sup.2 denotes an aliphatic hydrocarbon radical which has 10 to 35 carbon atoms and optionally contains double bonds,R.sup.3 denotes a hydrocarbon radical which is at least divalent and can also be heterocyclic, with inclusion of the ester oxygen or amide nitrogen from X, ##STR2## where R.dbd.H or C.sub.1 -C.sub.4 -alkyl, or R is a constituent of a cyclic structure,n denotes a number .gtoreq.2 and y denotes a number .gtoreq.

Abstract: This invention relates to non-ionic emulsifiers based on fatty acid esters of polyalkoxylated polyhydric alcohols as fundamental constituents. At least two fundamental constituents are linked to each other by the reaction of hydroxyl groups with a polyisocyanate, with the formation of urethane bonds.

Abstract: The present invention is directed to a polymeric vehicle, the formulated coating composition and a coating binder made from the polymeric vehicle and a method for making the polymeric vehicle where the polymeric vehicle includes a phenol blocked isocyanate having reactive aliphatic hydroxyl groups. The phenol blocked isocyanate may be made from a phenolic ester alcohol having at least one aliphatic hydroxyl group and one phenolic hydroxyl group.

Abstract: Polyoxyalkylene polyols containing double metal cyanide complexes or residues thereof as are produced during the preparation of polyoxyalkylene polyols by the double metal cyanide complex catalyzed oxyalkylation of a suitably functional hydric initiator are stable without catalyst removal. Isocyanate-terminated prepolymers prepared from such polyols are surprisingly viscosity-stable relative to similar prepolymers prepared from polyols not containing double metal cyanide complexes or residues thereof.

Abstract: Isocyanate prepolymers which are useful as binders are made from a polyisocyanate mixture and a hydroxyl compound having at least about 1 hydroxyl group. The polyisocyanate mixture is made up of from about 50 to about 60% by weight of polyphenyl polymethylene polyisocyanate and from about 40 to about 50% by weight of an isomeric mixture of diphenylmethane diisocyanate (MDI). The isomeric mixture of MDI is made up of from about 4 to about 30% by weight of the 2,4'-isomer and from about 70 to about 96% by weight of the 4,4'-isomer. The binders of the present invention are advantageous in that they may be used in high moisture, low temperature conditions without a catalyst. Reduced MDI emissions are also achieved when the binders of the present invention are used to make composite materials.

Abstract: Stabilizer precursors and preformed stabilizers having induced unsaturation, and prepared from low intrinsic unsaturation-containing polyoxyalkylene polyether polyols may be used to form polymer polyols of higher solids content, lower viscosity, and superior filterability and particle size than polymer polyols prepared from stabilizers derived from polyols having higher intrinsic unsaturation, even when the latter are coupled to form high molecular weight stabilizers.

Abstract: A di-hydroxy-functionalized linear non-crosslinked polyolefin is disclosed having no pendant chain-branched groups which is prepared by reacting 1,4-diacetoxy-2-butene with 1,5-cyclooctadiene in the presence of a catalyst comprising a ruthenium metal carbene complex, characterized in that the functionality number of said polyolefin as determined by NMR is 2.0 and the viscosity of said polyolefin ranges from about 800 to 16000 mPa.s @25.degree. C. at a number average molecular weight ranging from 2,600 to 6,500 g/mole. A prepolymer comprising the reaction of a polyisocyanate with the polyolefin is also disclosed.

Abstract: A viscosity conditioner is disclosed which is comprised of a compound represented by the following formula ##STR1## where R.sup.1 to R.sup.3 each are hydrocarbyl groups which may be identical or different, m ranges from 2 to 4, and n ranges from 1 to 1,000. The specified viscosity conditioner is by nature non-ionic and excellent in leveling.

Abstract: The present invention is directed to a polymeric vehicle, the formulated coating composition and a coating binder made from the polymeric vehicle and a method for making the polymeric vehicle where the polymeric vehicle includes a phenolic urethane reactive diluent. The phenolic urethane reactive diluent may be made from a phenolic ester alcohol having at least one aliphatic hydroxyl group.

Abstract: Provided is a primer composition which gives a cured film having a high refractive index and impact resistance, the primer composition containing, as main film-forming components, a bromine compound containing a unit derived from tetrabromobisphenol A and a polyisocyanate, or a prepolymer obtained by reacting them.

Abstract: A polyisocyanate composition, comprising:A) from 55 to 87% by weight of a polyisocyanate which contains uretdione groups;B) from 10 to 30% by weight of blocking agent,C) from 3 to 30% by weight of polyol having more than two hydroxyl groups and/or chain extender having more than two hydroxyl groups, wherein the polyisocyanate contains more than two terminal, partially or fully blocked isocyanate groups and has a molecular weight of from 1000 to 10,000.

Abstract: Disclosed is an acid-funtionalized polyurethane adduct and a process for the preparation of such adduct. The adduct having a linear or preferably branched structure comprises a plurality of internal urethane linkages and one or more terminal carboxylic acid groups per molecule. Such acid-funtionalized polyurethane adducts find value in the manufacture of crosslinked aqueous rubber latexes such as might be used in paint compositions.

Abstract: This invention relates to novel liquid, homogeneous toluene diisocyanate/polyether/polymethylene poly(phenylisocyanate) prepolymers having an NCO content of from about 2 to 16%, a viscosity or about 10,000 mPa.s or less at room temperature, and which contains about 1.0% or less of free monomeric TDI. This invention also relates to a process for the preparation of these liquid, homogeneous toluene diisocyanate/polyether/-polymethylene poly(phenylisocyanate) prepolymers.

Abstract: Polyoxyalkylene polyols containing double metal cyanide complexes or residues thereof as are produced during the preparation of polyoxyalkylene polyols by the double metal cyanide complex catalyzed oxyalkylation of a suitably functional hydric initiator are stable without catalyst removal. Isocyanate-terminated prepolymers prepared from such polyols are surprisingly viscosity-stable relative to similar prepolymers prepared from polyols not containing double metal cyanide complexes or residues thereof.

Abstract: The present invention relates to a process for the solvent-free production of polyisocyanate addition products, which are suitable as dispersing agents for incorporating solids into aqueous coating compositions, wherein the polyisocyanate addition products have a maximum content of 1% by weight of isocyanate groups and a content of 30 to 95% by weight of ethylene oxide units (molecular weight=44) present in the polyether chains of monofunctional alcohols B), and are prepared by reactingA) a polyisocyanate component having an average NCO functionality of 1.7 to 2.5 and an NCO content of 10 to 65% by weight with one or more of the following components:B) monohydric polyether alcohols having a number average molecular weight of 150 to 5000 and an ethylene oxide content of 40 to 99.

Abstract: In the decomposition of a polymer containing a urethane linkage and/or urea linkage in the presence of a decomposing agent, the amount of evolved carbon dioxide is measured and the decomposition reaction is conducted until a total amount of evolved carbon dioxide reaches a specified value to obtain a liquid decomposition product. According to the present invention, a decomposition product having constant quality can be obtained in a simple manner.

Abstract: Process for preparing a flexible foam by reacting a polyisocyanate composition having an NCO value of 11-24% by weight with an isocyanate-reactive compound having a number average molecular weight of 1000-12000 using water as blowing agent.

Abstract: The present invention relates to polyisocyanates containingi) 0.5 to 10 wt. % of amide and/or imide structural units (calculated as --CO--N.dbd., MW=42),ii) 5 to 20 wt. % of isocyanate groups (calculated as --NCO, MW=42) blocked with blocking agents which are monofunctional in the context of the isocyanate addition reaction andiii) 0 to 30 wt. % of chemically incorporated urethane groups (calculated as --NH--CO--O--, MW=59) obtained from the reaction of isocyanate groups with the hydroxyl groups of organic polyhydroxyl compounds.The present invention also relates to a process for the production of these lacquer polyisocyanates, their use as a binder for stoving lacquers optionally in combination with organic polyhydroxyl compounds and to their use as a binder component containing free hydroxyl groups and optionally blocked isocyanate groups by reacting and/or blending the polyisocyanates with organic polyhydroxyl compounds having a molecular weight of 62 to 350.

Abstract: The specification discloses a method and additive for increasing the surface activity of non-polar polymeric materials, and a non-polar polymeric material exhibiting increased surface activity. The invention employs an additive of the formulaA-B-A.sup.1wherein each of the A and A.sup.1 blocks which may be the same or different has a number molecular weight in the range of from about 200 to about 1000 daltons and is selected from the group substituted and unsubstituted alkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl and alkylaryl units derived from one or more esters, organic acids, organic halides or organic acid halides, and units derived from alkyl or aryl isocyanates or ester-amides. The B-block is a polyepichlorohydrin unit derived from a polyepichlorohydrin polyol having at least two terminal hydroxyl groups and having an average molecular weight in the range of from about 400 to about 4000 daltons.

Abstract: Compounds of formulaA(B).sub.x, (I),wherein x is an integer from 1 to 4, A is the radical of a chromophore of the quinacridone, anthraquinone, perylene, indigo, quinophthalone, isoindolinone, isoindoline, dioxazine, phthalocyanine or azo series, which radical contains x N-atoms attached to B, preferably with at least one directly adjacent or conjugated carbonyl group,B is a group of formula ##STR1## and, if x is 2,3 or 4, may also be one, two or three hydrogen atoms. The symbols Q, R.sub.1, R.sub.2, R.sub.3, R.sub.4, X, Y, Z, m und n, are as defined in claim 1.These carbamate group-containing soluble chromophores are distinguished by outstanding solid state fluorescence in the UV range as well as the by ease with which they can be converted to the corresponding pigments in the substrate in which they are incorporated.

Abstract: Elastomers exhibiting decreased demold times and improved green strength are prepared by reacting a di- or polyisocyanate with a monodisperse polyoxypropylene diol having ultra-low unsaturation, and preferably prepared by the double metal cyanide.t-butyl alcohol catalyzed polymerization of propylene oxide. Further improved demold times and elevated elastomer physical properties are made possible by the use of multidisperse polyoxyalkylene polyether polyol blends having an overall unsaturation of less than 0.010 meq/g and a polydispersity of about 1.4 or greater.

Abstract: Products prepared by reacting polyisocyanates with alkenyl or alkynyl compounds; then with perfluoroalkyl iodides & dehydroiodinating the product.

Abstract: A series of novel oxirane derivatives, which are useful for inhibiting HIV are disclosed. Particularly of value are peptidomimetic compounds, containing a terminal epoxide group on a peptide or psuedopeptide backbone, which are believed to inhibit HIV protease by extruding enzyme-bound water molecules from the active site of the enzyme.

Abstract: An isocyanate-terminated polyurethane prepolymer comprising the reaction product of a polyisocyanate and a polyol composition consisting essentially of a polyether polyol of 350-2000 equivalent weight and a low molecular weight polyol of 62 to<300 molecular weight, in an equivalent ratio of low molecular weight polyol to polyether polyol of 0.25-2.7:1. A polyurethane-urea elastomer having good dynamic properties can be prepared by reacting the isocyanate-terminated prepolymer with an aromatic amine chain extender at an equivalent ratio of 0.9-1.1:1.

Abstract: A polyisocyanate prepolymer composition is comprised of the reaction product of (a) a polyisocyanate having an average functionality of at least 2 and containing at least about 20 percent by weight of a diisocyanate monomer, (b) a monohydric alcohol and (c) a polyol having an average hydroxyl functionality of at least about 1.8 to at most about 3.2 wherein the prepolymer composition has (i) an amount of isocyanate groups by weight sufficient to react with water in the absence of a supplemental blowing agent to make a foam, (ii) at most about 10.0 percent by weight of the diisocyanate monomer and (iii) an amount of the polyisocyanate that is capped by the monohydric alcohol sufficient to prevent gelling of the prepolymer composition. The prepolymer composition may be reacted with water to form a polyurethane foam.

Abstract: A TDI residue generated from the phosgenation of toluene diamine having an ortho-isomer content of less than 0.5% is used to produce a urethane-filled hydroxyl compound. The TDI residues useful in this invention must contain at least 10% monomeric TDI and have a total NCO content of at least 20%. These TDI residues are reacted with a monofunctional alcohol in an amount such that the equivalent ratio of isocyanate groups to hydroxyl groups is from about 0.9:1 to about 1:0.9. The resultant composition may then be dissolved in a polyhydroxyl compound to produce a urethane-filled polyhydroxyl compound. This urethane-filled polyhydroxyl compound may then be reacted with a polyisocyanate to produce a polyurethane.

Abstract: The present invention relates to two-part reactive polyurethane compositons and the cured coatings prepared therefrom. The invention also relates to particular compositions and cured coatings therefrom that exhibit high damping character, excellent scratch-resistance, excellent mar-resistance, and self-healing characteristics. The invention also relates to a novel polyurethane prepolymer useful in some ofthe compositions. The invention also relates to method of making certain coatings of the invention.

Abstract: A substantially solid free isocyanate prepolymer is made by reacting an isocyanate mixture which is made up of a toluene diisocyanate residue containing monomeric toluene diisocyanate and optionally, additional monomeric toluene diisocyanate in an amount such that the total NCO content is at least 37% with a polyether polyol having an ethylene oxide content of at least 30%. The polyether polyol has a molecular weight of from about 200 to about 6,000 and a functionality of from 2 to 6. The product prepolymers are particularly useful in the production of polyurethanes.

Abstract: TDI residue-based urethane-filled isocyanate compositions are produced by reacting a TDI residue satisfying specified criteria with a monofunctional alcohol in amounts such that the equivalent ratio of isocyanate groups to hydroxyl groups is from about 0.9:1 to about 1:0.9. This reaction product is then dissolved in a diisocyanate or polyisocyanate. These TDI residue-based urethane-filled isocyanate compositions are particularly useful in the production of polyurethanes.

Abstract: A polyisocyanate composition, comprising:A) from 55 to 87% by weight of a polyisocyanate which contains uretdione groups;B) from 10 to 30% by weight of blocking agent,C) from 3 to 30% by weight of polyol having more than two hydroxyl groups and/or chain extender having more than two hydroxyl groups, wherein the polyisocyanate contains more than two terminal, partially or fully blocked isocyanate groups and has a molecular weight of from 1000 to 10,000.

Abstract: Polyisocyanates based on polyhydroxy polyethers and tolylene diisocyanate containing ether and urethane groups and having an isocyanate group content of from 11.8 to 14.4% by weight, an average isocyanate functionality of from 3.1 to 4.0 and a free tolylene diisocyanate content of less than 0.1% by weight are produced by reacting a polyhydroxy polyether having a molecular weight in the range of from about 350 to about 500 with excess quantities of tolylene diisocyanate and subsequently distilling the mixture to remove unreacted excess of the starting diisocyanate. These polyisocyanates are particularly useful in the production of polyurethane lacquers.

Abstract: The present invention relates to polyisocyanate adducts containing allophanate groups, fluorine and optionally isocyanurate groups that are prepared by reacting compounds a) whichi) are substantially free of hydroxyl groups and isocyanate groups,ii) have an average of at least two urethane groups per molecule andiii) contain 0 to 50% by weight of fluorine, based on the weight of the polyisocyanate adducts,with an excess quantity, based on the equivalents of urethane groups, of polyisocyanates b), which optionally contain fluorine, to form polyisocyanate adducts and optionally removing at least a portion of the unreacted excess polyisocyanates b), provided that compounds a) and polyisocyanates b) contain a total of at least 0.001% by weight, of fluorine, based on the weight of the polyisocyanate adducts.

Abstract: An aqueous two-component polyisocyanate coating composition is based on an essentially isocyanate-free emulsifier that comprises the reaction product of:(i) an isocyanate and(ii) a member selected from the group consisting of: hydroxy functional polyalkyl ethers containing at least five ethylene oxide, alcohols different from said polyalkyl ethers, amine compounds, and combinations thereof. The hydroxy functional polyalkyl ether is provided in a quantity sufficient to react at least one equivalent of isocyanate groups in polyisocyanate (i), and the total amounts of reactants (ii) are sufficient to react all of the isocyanate groups of the polyisocyanate (i).

Abstract: Fluorinated alkene compounds useful for and methods of controlling nematodes, insects, and acarids that prey on agricultural crops. Polar compounds, for example, 3,4,4-trifluoro-3-butene-1-amine or 3,4,4-trifluoro-3-butenoic acid, are particularly useful for systemic control of pests. Novel method and intermediates for the preparation of 3,4,4-trifluoro-3-butene-1-amine are also provided.

Abstract: A process for producing moldings containing ester and urethane groups and having a cellular core and a compacted surface zone, preferably shoe soles, comprises reactinga) isocyanate semiprepolymers containing ester groups and having an isocyanate content of from 10 to 26% by weight, which in turn are prepared by reactingai) 4,4'-MDI or mixtures of 4,4'-MDI and modified or unmodified MDI isomers,withaii) difunctional to trifunctional polyester polyols having molecular weights of from 600 to 3000 andaiii) at least one branched-chain dihydroxy compound containing at least one bonded ester unit as bridge and having a molecular weight of up to 500,withb) at least one relatively high molecular weight polyhydroxyl compound and, if desired,c) low molecular weight chain extenders and/or crosslinkersin the presence ofd) blowing agents,e) catalystsand, if desired,f) additives in a closed mold with compaction.

Abstract: A method for preparing a polyurethane foam which comprises reacting an organic polyisocyanate and a polyol in the presence of a blowing agent, a cell stabilizer and a catalyst composition comprising at least one compound of either of the following formulas IA and IB: ##STR1## where R is hydrogen, methyl or hydroxymethyl. The preferred catalysts comprise 3-hydroxymethyl quinuclidine, 3-methyl-3-hydroxymethyl quinuclidine and 4-hydroxymethyl quinuclidine.

Abstract: The present invention relates to polyisocyanates prepared from diphenylmethane diisocyanate wherein at least 95% of the isocyanate groups are blocked with diethyl malonate and wherein the polyisocyanates have, based on solids,A) a content of unblocked and blocked isocyanate groups (calculated as NCO) of 9% to 13%,B) a content of allophanate groups (calculated as C.sub.2 HN.sub.2 O.sub.3, molecular weight 101) of 3% to 9% andC) a calculated average functionality of 2.0 to 2.5.The present invention also relates to a process for the production of these polyisocyanates and to their use as crosslinking agents for organic polyhydroxyl compounds in polyurethane stoving lacquers.