Abstract: The present invention is directed to a polyisocyanate mixturei) having an NCO content of 5 to 35% by weight and prepared from an organic diisocyanate,ii) containing at least 1% by weight of isocyanurate groups (calculated as N.sub.3, C.sub.3, O.sub.3, MW 126),iii) containing allophanate groups in an amount such that there are more equivalents of allophanate groups than urethane groups andiv) containing fluorine (calculated as F, AW 19) in an amount of 0.

Abstract: The present invention is directed to a polyisocyanate mixturei) having an NCO content of 5 to 35% by weight and prepared from an organic diisocyanate,ii) containing up to 25% by weight of isocyanurate groups (calculated as N.sub.3, C.sub.3, O.sub.3, MW 126),iii) containing allophanate groups in an amount such that there are more equivalents of allophanate groups than urethane or urea groups and such that the polyisocyanate mixture remains stable and homogeneous in storage for 3 months at 25.degree. C. andiv) containing siloxane groups (calculated as SiO, MW 44) in an amount of 0.002 to 50% by weight,wherein the preceding percentages are based on the solids content of the polyisocyanate mixture, excluding any unreacted organic diisocyanate, and wherein the siloxane groups are incorporated by reacting an isocyanate group with a compound containing one isocyanate-reactive group directly attached to a carbon atom and one or more siloxane groups.

Abstract: Allophanate-modified MDI which is a storage stable liquid at 25.degree. C. is produced in two steps. First, a monoisocyanate is reacted with an organic material having about 1.8 or more hydroxyl groups and a molecular weight of from about 60 to about 6,000 to form the urethane. The urethane is then reacted with an isomeric mixture of MDI in an amount such that the resultant isocyanate will have an NCO content of from about 3 to about 28%. The isomeric mixture of diphenylmethane diisocyanate contains from about 0 to about 60% by weight 2,4'-diphenylmethane diisocyanate, less than 6% by weight 2,2'-MDI and the remainder 4,4'-MDI. The prepolymers of this invention are particularly useful in reaction injection molding processes because molded articles having improved flex modulus are obtained.

Abstract: The present invention is directed to a polyisocyanate mixturei) having an NCO content of 5 to 35% by weight and prepared from an organic diisocyanate,ii) containing less than 5% by weight of isocyanurate groups (calculated as N.sub.3, C.sub.3, O.sub.3, MW 126),iii) containing allophanate groups in an amount such that there are more equivalents of allophanate groups than urethane groups andiv) containing fluorine (calculated as F, AW 19) in an amount of 0.001 to 50% by weight, based on solids.,wherein fluorine is incorporated with compounds containing two or more carbon atoms, one or more hydroxyl groups and one or more fluorine atoms. The present invention is also directed to a process for the production of this polyisocyanate mixture and to its use, optionally in blocked form, as an isocyanate component in one- or two-component coating compositions.

Abstract: Ether-linked amine-terminated polyesters are produced by reacting (1) a polyester polyol in which substantially all of the hydroxyl groups have been replaced with good leaving groups with (2) an aminoalcohol and/or aminothiol and (3) a deprotonating agent. The aminopolyesters obtained by this process are characterized by excellent reactivities over a wide range of molecular weights and functionalities.

Abstract: This invention relates to a one-step process for preparing polyurea elastomers comprising reaction at an isocyanate index of from 90 to 200 of(a) one or more aliphatic and/or cycloaliphatic diisocyanates;(b) 25 to 70 equivalent percent, relative to the total of components (b) and (c), of one or more liquid amine-terminated polymers containing at least two aromatically bound isocyanate-reactive primary or secondary amino groups and/or aliphatically bound isocyanate-reactive secondary amino groups and having a molecular weight of from 400 to 6000; and(c) 75 to 30 equivalent percent, relative to the total of components (b) and (c), of one or more aromatic diamine chain extenders having a molecular weight of from 108 to 399, optionally in admixture with one or more crosslinkers.

Abstract: Ether-linked amine-terminated polyethers are produced by reacting (1) a polyether polyol in which substantially all of the hydroxyl groups have been replaced with good leaving groups with (2) an aminoalcohol and/or aminothiol and (3) a deprotonating agent. The aminopolyethers obtained by this process are characterized by low viscosities and excellent reactivities over a wide range of molecular weights and functionalities.

Abstract: The present invention is directed to polyurethane moldings produced via the RIM process. These polyurethane moldings have excellent reactivity, demold properties (at a 30 s demold), and good elongation and tear strength, and comprise the reaction product of an aliphatic polyisocyanate having a viscosity of less than about 20,000 mPa.multidot.s at 25.degree. C. and a NCO functionality of 2.3 to 4.0 with an isocyanatereactive component comprising b1) a relatively high molecular weight organic compound containing at least one of the groups selected from the group consisting of hydroxy groups and amine groups; and b2) a low molecular weight chain extender selected from the group consisting of diols, triols, primary amines, secondary amines, aminoalcohols, and mixtures thereof; in the presence of a catalyst. The OH:NH ratio of the chain extender is from 1:1 to 25:1.

Abstract: The present invention is directed to polyurethane moldings produced via the RIM process. These polyurethane moldings have excellent reactivity, demold properties (at a 30s demold), and good elongation and tear strength, and comprise the reaction product of an HDI prepolymer having an NCO content of 5 to 25%, a functionality of less than 2.3, and a monomer content of less than 10%, with an isocyanate-reactive component comprising b1) at least one relatively high molecular weight organic compound containing at least about two isocyanate-reactive hydroxyl groups; b2) at least one relatively low molecular weight organic compound selected from the group consisting of diols, aminoalcohols, and mixtures thereof; and b3) at least one relatively low molecular weight hydroxyl-based crosslinking compound containing no more than one aliphatic amine hydrogen atoms capable of reacting with isocyanate groups; in the presence of at least one catalyst.

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 an aromatic monoalcohol containing 6 to 9 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 0:1 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 are processes for the production of allophanate-modified diphenylmethane diisocyanate prepolymers and the products produced by the processes which are both stable and liquid at 25.degree. C. by reacting (i) 4,4'-diphenyl-methane diisocyanate containing from 2 to 60% by weight 2,4'-MDI and less than 6% by weight of the 2,2'-MDI with (ii) an aromatic alcohol containing between 6 and 18 carbon atoms such as phenol, with the resulting product being converted to the allophanate having an isocyanate group content of from 12 to 32% by weight.

Abstract: Storage stable, liquid prepolymers of diphenylmethane diisocyanate containing urea and/or biuret groups are prepared by reacting an aminocrotonate with a mixture of isocyanates having a specified diphenylmethane diisocyanate isomer content. These prepolymers have isocyanate group contents of from about 5 to about 30%.

Abstract: Novel liquid, room temperature polyisocyanate having isocyanate group contents of from 6 to 31% by weight, are prepared by reacting:a) a methylene-bis(phenyl isocyanate) containing1) from 65 to 90% by weight of the 4,4'-isomer,2) from 10 to 35% by weigh of the 2,4'-isomer, and3) no more than 2% by weight of the 2,2'-isomer, with the percents of components a)1), a)2), and a)3) totalling 100%, andb) a mixture of:1) one or more organic compounds having molecular weights of from 400 to 6000 and containing from 2 to 8 isocyanate reactive groups, and2) one or more organic diols having molecular weights of from 60 to 200, excluding tripropylene glycol, the weight ratio of component b)1) to b)2) being from 150:1 to 5:1.When used in a RIM process, molded products are obtained which have improved tear strength, improved flexural modulus, improved impact resistance, and improved tensile strength.

Abstract: Disclosed herein is a process for recovering toluene diisocyanate (TDI) from a TDI residue solution, comprising mixing the residue solution with a polyisocyanate consisting essentially of methylenediphenyl diisocyanate (MDI) or MDI in combination with its higher ring oligomer, followed by heating the resulting mixture over a temperature range of 130.degree. to 250.degree. C. for a period of time sufficient to remove free TDI and thermally splittable TDI generated from equilibration of the TDI residue with MDI or the MDI oligomer by either a batch or continuous process.

Abstract: Disclosed herein is a method of preparing an activated polyether polyol by reacting an aminoalcohol with a polyether terminated with a leaving group.

Abstract: The present invention relates to a stable, liquid MDI prepolymer containing an allophanate-modified MDI, having an NCO content of 12 to 32.5% comprising a reaction product of an aliphatic alcohol and diphenylmethane diisocyanate comprising about 2 to 60% by weight 2,4'-diphenylmethane diisocyanate and less than 6% by weight of the 2,2'-diphenylmethane diisocyanate, and the rest being 4,4'-diphenylmethane diisocyanate.

Abstract: The present invention relates to a process for the production of a allophanate-modified MDI which is a storage stable liquid at 25.degree. C. comprising (A) reacting (i) one equivalent of a diisocyanate and (ii) one equivalent of an aliphatic alcohol containing from 1 to about 36 carbon atoms or aromatic alcohol containing from 6 to 18 carbon atoms to form a diurethane of the diisocyanate, (B) reacting the product of (A) with 4,4'-diphenylmethane diisocyanate containing from 2 to 60% by weight 2,4'-MDI and less than 6% by weight of the 2,2'-MDI, in an amount sufficient to provide an allophanate having an isocyanate group content of about 12.0 to 30.0%.

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 at least 10 carbon atoms and having a molecular weight of 158 to 2500.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.

Abstract: The present invention is directed to a RIM process and an isocyanate reactive composition for use therein. The isocyanate composition includes an amine terminated chain extender and an aromatic amine terminated polyether of the formula: ##STR1## wherein R is an n-valent group obtained by the removal of hydroxyl groups from an n-hydroxy group containing polyhydroxyl compound having a molecular weight of from about 300 to about 12,000,R.sub.1 represents hydrogen or an inert substituent,R.sub.2 represents hydrogen, an amine group, or an inert substituent, andn represents an integer from 2 to 4.

Abstract: Disclosed herein is a liquid isocyanate prepolymer having an isocyanate group content of from 10 to 30% by weight, prepared by reacting:i) a polyfunctional secondary amine group containing material of the general formula: ##STR1## wherein R represents alkyl, alkenyl, cycloalkyl, aralkyl or aryl radical:A represents an organic radical having a molecular weight between 28 and 6000 and having a functionality of m andm represents an integer from 2 to 6;withii) an isocyanate mixture comprising:a) from 50 to 100% by weight of diphenylmethane diisocyanate of which from 2 to 50% by weight consist of 2,2'- and 2,4'-isomers; andb) the balance being polyphenylpolymethylene polyisocyanates.