Abstract: The present invention is directed to a process for the production of a polyisocyanate composition having an NCO content of 10 to 47% by weight and a viscosity of less than 2,500 mPa.s, wherein the viscosity is determined from a mixture containing less than 1% by weight of the starting organic diisocyanate, and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 bya) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groupsb) adding 0.01 to 0.

Abstract: Disclosed herein is an improved polyurea system comprising a reaction product of a polyisocyanate and a polyamine and an amine chain extender, the improvement comprising the polyisocyanate containing diethyl methylene diisocyanate, a prepolymer thereof or a mixture thereof, in an amount sufficient to slow down the reaction for use in a reaction injection molding.

Abstract: The present invention is directed to a polyisocyanate mixture having an NCO content of 10 to 47% by weight and a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5, wherein the allophanate groups are formed from urethane groups which are based on the reaction product of an organic diisocyanate having (cyclo)aliphatic bound isocyanate groups and a monoalcohol containing 1 to 5 carbon atoms.The present invention is also directed to a process for the production of a polyisocyanate mixture having an NCO content of 10 to 47% by weight, having a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 bya) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groupsb) adding 0.01 to 0.

Abstract: The present invention is directed to a liquid, storage-stable isocyanate prepolymer having an isocyanate group content of from 10 to 30% by weight, prepared by reacting:i) a polyamine containing at least two aromatically bound primary amino groups prepared by hydrolyzing an isocyanate compound having an isocyanate group content of from 0.5 to 40% by weight, withii) an isocyanate mixture comprisinga) from 50 to 100% by weight of diphenylmethane diisocyanates of which from 3 to 50% by weight consist of the 2,2'- and 2,4'-isomers, andb) the balance being polyphenylpolymethylene polyisocyanates, with the proviso that if said mixture comprises from 95 to 100% by weight of diphenylmethane diisocyanate, at least 15% by weight of said diisocyanate consisting of the 2,2'- and 2,4'-isomers.

Abstract: The present invention is directed to a liquid, storage-stable isocyanate prepolymer having an isocyanate group content of from 3 to 45% by weight, prepared by reacting(i) toluene diisocyanate and(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 ##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: The present invention is directed to a process for the production of an isocyanate which is both stable and liquid at 25.degree. C. comprising reacting(i) diphenylmethane diisocyanate,(ii) an organic material containing two or more hydroxy groups, said organic material forming a product solid at 25.degree. C. when reacted with diphenylmethane diisocyanate in an amount such that the resultant solid product would have an isocyanate group content of from 10 to 30% by weight, and(iii) from 1 to 6% by weight, based on the combined weight of (i), (ii) and (iii), of tripropylene glycol, the amounts of components (i), (ii) and (iii) being such that the resultant product has an isocyanate group content of from about 10 to 30% by weight.

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: 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) an isocyante selected from the group consisting of methylene bis(phenylisocyanates), polymethylene poly(phenylisocyanates), and mixtures thereof, and(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 ##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: The present invention is directed to liquid, modified isocyanates prepared by reacting 4,4'-diphenylmethane diisocyanate, specific amines, and tripropylene glycol. The invention is also directed to processes for the production thereof.

Abstract: Polyisocyanates with biuret structures are produced at temperatures above 250.degree. C. More specifically, an excess of a diisocyanate having aliphatically and/or cycloaliphatically bound isocyanate groups is reacted with a diamine containing aliphatically and/or cycloaliphatically bound amino groups at temperatures above 250.degree. C. for relatively brief periods of time. Water and/or polyvalent alcohols may optionally be included in the reaction mixture. The polyisocyanates with biuret structures produced by this process are characterized by good color, good dilutability with covalent solvents and comparatively low viscosity.

Abstract: Aliphatic and/or cycloaliphatic polyisocyanates containing allophanate groups are produced by reacting (a) a di- and/or polyisocyanate with aliphatic and/or cycloaliphatic isocyanate groups with (b) a hydroxy compound at a temperature of at least 150.degree. C. for no more than 90 minutes and then rapidly cooling the reaction mixture to a temperature of less than 100.degree. C. It is preferred that the reaction be carried out in the absence of oxygen. The products thus obtained are virtually colorless, have a relatively low viscosity and excellent storage stability.

Abstract: The instant invention is directed to storage stable liquid, partially carbodiimidized methylenebis(phenyl isocyanate) and to the method of manufacture thereof. The products of the instant invention are produced by heating methylenebis(phenyl isocyanate) at a temperature of from 150.degree. to 300.degree. C. in the presence of from 1 ppb to 10 ppm of a phospholine oxide catalyst. The reaction mixture is then cooled once the desired isocyanate content has been reached. The resultant product can be used to produce a variety of isocyanate-addition reaction products, including polyurethanes, polyureas and the like.