Abstract: A composition which is the reaction product of (i) a material having the structure ##STR1## where R.sub.1 is an organic radical having 6 to 25 carbon atoms; R.sub.2 is alkylene having 1 to 4 carbon atoms; R.sub.3 and R.sub.4 are independently alkyl having 1 to 4 carbon atoms and n is 2-4 and (ii) an acidic hydrogen-containing compound. The compositions are useful as catalyst in induction curable adhesive compositions.

Abstract: A RIM process utilizing a reaction product of an MDI containing from 6 to 50% by weight of the 2,4'-isomer and a polypropylene glycol as the isocyanate reactant results in a molded product having excellent low temperature impact properties.

Abstract: This invention is a method of making a laminated untreated fiberglass reinforced polyester substrates and a cured polyureaurethane adhesive composition. The prepolymer component of the adhesive is the reaction product of a slowly reacting polyisocyanate and a polyol.

Abstract: Thermoplastically processable polyurethane elastomers are prepared by A) mixing one or more substantially linear polyols with a diisocyanate, B) reacting the resultant mixture substantially completely in a reactor at temperatures of >100.degree. C. to form a prepolymer, C) mixing the prepolymer with low molecular weight chain extenders, D) applying the reaction mixture prepared in stage C) to a support and allowing the mixture to react thereon to solidification.

Abstract: A linear segmented polyurethaneurea having a degree of branching (Nb) of 3 or less and obtained by chain-extending a prepolymer with an organic diamine in an organic solvent comprising dimethylformamide or dimethylacetamide, wherein the prepolymer has an isocyanate group at the both ends thereof and comprises a stoichiometrically excessive amount of a diisocyanate component selected from 4,4'-diphenylmethane diisocyanate, 2,4-toluene diisocyanate and 1,4-phenylene diisocyanate and a diol component having a number average molecular weight of 500 to 6000.

Abstract: Heat generation of a rubber composition can be lowered by incorporating to the composition a compound of the formula, (I), (II) or (III), ##STR1## where A is an aromatic group, hydantoin ring or C.sub.0-18 straight chain hydrocarbon group, B is an aromatic group, X is hydroxy or amino, Y is pyridyl or hydrozino.

Abstract: A process for producing an impact-resistant polyacetal resin composition, which comprises a first step of mixing with shear a polyacetal resin (A), a thermoplastic polyurethane (B) and a polyhydric alcohol (C) having at least three hydroxyl groups in the molecule at a temperature of 180.degree. to 250.degree. C. and at a temperature at which said polyacetal resin (A) and said thermoplastic polyurethane (B) melt; and a second step of mixing with shear the resulting mixture obtained in the first step, in the presence of at least one compound (D) selected from the group consisting of a polyisocyanate (d.sub.1) and a compound (d.sub.2) which generates a polyisocyanate under heat, at a temperature of 180.degree. to 250.degree. C. and at a temperature at which said polyacetal resin (A) and said thermoplastic polyurethane (B) melt.

Abstract: The invention relates to a process for the production of plastics containing amide groups with elimination of CO.sub.2 by reaction of polyfunctional isocyanates, carboxylic acids and, optionally, alcohols in the presence of tertiary amines, more particularly heteroaromatic amines. The heteroaromatic amines preferably contain another heteroatom and/or substituents having +I and/or +M effects. The reaction preferably starts at room temperature. Fine-cell foams having an acid value of less than 40 and a density of at most 150 g/l can be produced in short reaction times at room temperature without any need for additional blowing agents.

Abstract: The invention provides a process for the preparation of a cellular polymeric product which comprises reaction of a polyisocyanate composition with an isocyanate-reactive composition having a functionality of at least 2, in the presence of a blowing agent and in the presence of an inert, organic liquid which is substantially insoluble in the reaction mixture and which is present as the disperse phase of an emulsion or a microemulsion, characterized in that the polyisocyanate composition comprises polymethylene polyphenylene polyisocyanate having a functionality of at least 2.5 and a urethane-modified, isocyanate-ended prepolymer, wherein the isocyanate functionality of the polyisocyanate composition is at least 2.3 and wherein the concentration of urethane linkages in the polyisocyanate composition is in the range from 1 millimole to 150 millimoles per 100 grams thereof.

Abstract: This invention relates to a process for preparing polyurethane elastomers comprising reacting in an open mold at an isocyanate index of about 90 to about 110(a) an isocyanate prepolymer having an isocyanate content of about 2 to about 15% by weight and a molecular weight of from about 500 to about 5000 prepared by reaction of(i) at least one organic polyisocyanate with(ii) at least one isocyanate-reactive compound having at least two isocyanate-reactive groups and a molecular weight of from about 250 to about 4000;with(b) certain aminocrotonate-terminated polyethers having a molecular weight of from about 500 to about 1500;(c) optional chain extenders and/or crosslinkers other than aminocrotonate-terminated polyether (b); and(d) optional auxiliaries and/or additives.

Abstract: The present invention relates to a coating composition which is free from polyols and containsa) a polyisocyanate component,b) an aldimine based on the reaction product of a polyamine having 2 or more primary amino groups with an aldehyde andc) a compound containing aspartate groups,wherein components a), b) and c) are present in an amount sufficient to provide an equivalent ratio of isocyanate groups to aldimine groups and aspartate groups of 0.5:1 to 20:1 and wherein component c) is present in an amount sufficient to form a clear solution within 60 minutes of mixing components a), b) and c), provided that the amount of component c) is at least 5% by weight, based on the weight of components b) and c).The present invention also relates to a polyurea coating prepared from this coating composition.

Abstract: Isocyanate prepolymers based on an aromatic diisocyanate and a polyether polyol in which at least 95% of the isocyanate groups are blocked by blocking agents selected fromA) about 50 to about 97 equivalent % of a phenol or substituted phenol,B) about 30 to about 50 equivalent % of a pyrazole or a substituted pyrazole andC) 0 to about 10 equivalent % of a blocking agent different from A) and B).These blocked isocyanate prepolymers are particularly useful for the production of flexible epoxy resin systems.

Abstract: A polyurethane adhesive formed from (I) an NCO terminated prepolymer with excess of NCO and talc, and (II) a polyol, a urethane catalyst, talc and a minor amount of certain aryl or aromatic polyamines exhibits good sag and thixotropic properties and, also, exhibits good lap shear strength when cured between treatment-free substrates.

Abstract: Water dispersible, one component, self crosslinkable poly(urethane-urea) composition that is stable and capable of curing at room temperature is prepared by forming a prepolymer comprising an alcoholized drying oil; a diisocyanate, a polyalkylene ether polyol, and a dihydroxy containing alkanoic acid polyol; neutralizing the prepolymer; contacting the neutralized prepolymer with water and diamine wherein the alcoholized drying oil has a sufficient content of monoglycerides to allow for chain extension in step (C) and the poly(urethane-urea) self-crosslinks upon drying. The waterborne poly(urethane-urea) composition exhibits good chemical resistance, adhesion, abrasion, and high gloss properties when used as a coating.

Abstract: An aliphatic spray polyurea elastomer is disclosed. The elastomer comprises an (A) and (B) component. The (A) component includes an aliphatic isocyanate. The (B) component includes an amine terminated polyoxyalkylene polyol and an amine terminated aliphatic chain extender.

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: An aliphatic spray polyurea elastomer is disclosed. The elastomer comprises an (A) and (B) component. The (A) component includes an aliphatic isocyanate. The (B) component includes an amine terminated polyoxyalkylene polyol and an amine terminated aliphatic chain extender.

Abstract: A material suitable as crosslinking binder component for pigment-containing coatings and having an average molecular weight of from 25,000 to 150,000, obtainable by reacting a polyurethane comprising a diol having a molecular weight between 400 and 4,000, an aliphatic or cycloaliphatic diol of 2-18 carbon atoms, an aromatic diol of 8-36 carbon atoms, a trihydric or polyhydric alcohol of 3-18 carbon atoms, a polyhydric alcohol of 3-40 carbon atoms containing a tertiary amino group, and a diisocyanate of 3-34 carbon atoms with a compound containing one or more hydroxyl groups and one or more amino groups reactive toward isocyanate groups. The materials may be used as crosslinkable binder components for pigment-containing coatings, in particular for the production of magnetic recording materials.

Abstract: The present invention relates to polyisocyanate mixtures havinga) an average isocyanate functionality of at least 4.1,b) a (cyclo)aliphatically bound isocyanate group content (calculated as NCO, molecular weight =42) of 12.0 to 20.5% by weight,c) a chemically incorporated carboxyl group content (calculated as COOH, molecular weight =45) of 0.01 to 5.0% by weight andd) an ethylene oxide unit content arranged within terminal or lateral polyether chains of 0 to 10% by weight (calculated as C.sub.2 H.sub.4 O, molecular weight =44).The present invention also relates to a process for the preparation of these polyisocyanate mixtures and to their use as cross-linking agents in aqueous coating compositions containing water soluble or dispersible binders or binder components.

Abstract: A one-package primerless structural adhesive is disclosed that is particularly well suited for adhering one or more substrates of fiber-reinforced plastics. This adhesive uses dicyandiamide, its substituted derivatives, or melamine as the principal curative. A polyisocyanate prepolymer is made from various polyols reacted with polyisocyanates. In the absence of moisture, the curative and polyisocyanate can coexist in a single package without reacting for periods of time in excess of four months. Upon heating the adhesive to 150.degree. C., it cures in about five minutes or less, forming an initial structural bond that after heat aging is often stronger than the cohesive strength of the fiber reinforced substrate.

Abstract: The invention relates to a new polyamine of the following composition: ##STR1## wherein 1.gtoreq.n.gtoreq.6, R represents the hydrocarbon radical of a (cyclo)aliphatic, araliphatic or aromatic diisocyanate having 6-20 C atoms or a trimer thereof andwherein when 2.gtoreq.n.gtoreq.6,R.sup.1 represents an n-valent organic radical such as is formed by removal of n OH groups from a polyhydroxy compound which optionally contains ether oxygen atoms and has an average molecular weight Mn of between 60 and 5,000; andwhen n=1,R.sup.1 represents ##STR2## It furthermore relates to a process for the preparation of a polyamine, in which certain diisocyanates, adducts of diisocyanates with polyols or trimers thereof are reacted with the Schiff base of the following composition: ##STR3## wherein R.sup.2 =H or a branched or unbranched C.sub.1-14 -alkyl radical and R.sup.3 =a branched or unbranched C.sub.1-14 -alkyl radical, an C.sub.1-14 alkyl-substituted phenyl radical or a C.sub.1 -C.sub.

Abstract: This invention relates to o-tolidines which have a tert-butyl substituent ortho to an amine group. These compositions are represented by the formula: ##STR1## where R.sub.1 =i-propyl, or t-butyl, and where R.sub.2 =hydrogen, i-propyl, or t-butyl.The compositions are useful in the preparation of polyepoxide resins as well as polyurethanes, polyamides and polyimides.

Abstract: The invention relates to an azomethine of the following composition: ##STR1## in which R.sup.1 is H or a branched or unbranched C.sub.1-14 -alkyl radical, andR.sup.2 is a branched or unbranched C.sub.1-14 -alkyl radical, an C.sub.1-14 alkyl-substituted phenyl radical or a C.sub.1 -C.sub.8 -(cyclo)-alkyl radical.It further relates to a process for preparing an azomethine, in which ##STR2## is reacted with the corresponding carbonyl compounds ##STR3## The invention also relates to the use of the azomethines for the preparation of certain polyazomethines (poly-Schiff bases), where the azomethines are reacted with diisocyanates or their adducts with polyols or their trimers, and to polyazomethine compounds.

Abstract: Disclosed is a thermoplastic polyurethane which is a prepolymer/chain extender reaction product having a number average molecular weight of from 30,000 to 200,000, and a gel content of 5% by weight or less, based on the weight of the thermoplastic polyurethane;wherein the prepolymer is a prepolymer (A) comprising a polytetramethylene carbonate diol component (1) having a number average molecular weight of from 500 to 10,000 and an aliphatic diisocyanate component (2), the prepolymer (A) being represented by the following formula: ##STR1## wherein: X represents ##STR2## in which m is a number having an average value of from 3 to 85; Y represents an aliphatic diisocyanate residue; andn represents a number having an average value of from 1 to 50, andwherein the chain extender component is a chain extender (B) having an active hydrogen atom which is selected from the group consisting of a diol having a molecular weight of 300 or less, a diamine having a molecular weight of 300 or less, hydrazine and water.

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: Di-amines endowed with chain extension activity for formulations such as polyureas and polyurethanes are disclosed, and which have the general formula: ##STR1## wherein n is 0-1000 and m is 0-100; R.sub.1, R.sub.2, R.sub.5, and R.sub.6 are each independently selected from the group consisting of H, --CH.sub.3, --CH.sub.2 CH.sub.3, --CH.sub.2 OH, and --CH.sub.2 --CH.sub.2 --OH; and R.sub.3 and P.sub.4 are each independently selected from the group consisting of --C.sub.2 H.sub.4 --; and --C.sub.3 H.sub.6 --; and the diasteromeric salts thereof.

Abstract: The present invention relates to a thermosetting coating composition based on a binder composition containingA) prepolymers containing isocyanate groups blocked with .epsilon.-caprolactam, having an average molecular weight of 1000 to 10,000 and prepared fromA1) aromatic polyisocyanates andA2) a component containing at least one organic compound having hydroxyl groups wherein 50 to 100 hydroxyl equivalent percent of component A2) is based on polyesters containing hydroxyl groups and 0 to 50 hydroxyl equivalent percent is based on polyhydroxyl compounds which are free from ester groups andB) a hardener component containing at least one cycloaliphatic polyamine having at least two primary amino groups,in an equivalent ratio of blocked isocyanate groups to amino groups of 1:1 to 1:1.5.The invention also relates to use of the coating compositions to produce stoving-resistant gravel-proof primer coatings on optionally pretreated metal substrates.

Abstract: This invention relates to a process for preparing polyol-containing dispersions by reacting polyurethane-urea waste with at least one linear and/or branched-chain diol and/or polyol with a mol mass of 50-1000 g/mol in a ratio by weight of polymer waste to diol and/or polyol of greater than 3:1 at a temperature of 150.degree.-250.degree. C., optionally in the presence of acid or basic catalysts, and by dispersing the reaction product in at least one primary polyol with a mol mass up to about 6000 g/mol.The resultant dispersions are suitable for the preparation of polyurethanes or polyurethane-ureas.

Abstract: A polyurethane or polyurethane-urea elastomeric composition, characterized in that the composition is a reaction product of:(A) a soft segment macrodiol which is either:(i) a homopolymer represented by formula I,HO--[(CH.sub.2).sub.n O].sub.m --H Iwherein n represents an integer greater than 5 and less than 13, m is a number such that the number average molecular weight of the compound of formula I falls in the range from 218 to 5000 and optionally at least one hydrogen atom represented in formula I is substituted by a C.sub.1 to C.sub.3 alkyl group or a halogen atom;(ii) a copolymer containing at least 25% by mass of repeating units --(CH.sub.2).sub.n O-- wherein n is as defined in formula I above; or(iii) mixture of macrodiols comprising greater than 10% of a macrodiol as defined in formula I above;(B ) an aliphatic or aromatic diisocyanate known in the art of polyurethane manufacture; and(C) optionally a chain extender.

Abstract: Certain polyether-based or polyester-based polyurethaneureas in solutions of organic solvent at a 12 to 20% concentration are particularly suited for use in a mandrel-dipping process for producing thin-walled elastic articles, such as surgical gloves, which are more resistant to puncture and tear than conventional surgical gloves made from rubber latex.

Abstract: Novel polymers which are suitable as binders are obtainable by reacting(A) a base resin which has an average molecular weight M.sub.w of from 200 to 5,000 and contains on average from 1 to 3 epoxy or isocyanato groups as the reactive groups per moleculewith(B) a mixture of(B1) 5 to 50% by weight of polyisobutylene which is terminated with primary amino groups and has an average molecular weight M.sub.w of from 500 to 5,000 and(B2) 5-95% by weight of an amidoamine which carries primary amino groups and is obtainable by condensation of diprimary diamines of 2 to 20 carbon atoms with aliphatic C.sub.2 -C.sub.44 -dicarboxylic acids,the amounts being such that from 1 to 5 equivalents of primary amino groups of (B) are present per equivalent of reactive groups of (A).

Abstract: Poly(urethane-urea) reaction injection molded compositions having improved processing and lower water absorption are prepared by reacting an isocyanate-terminated prepolymer prepared by reacting 4,4'-MDI or modified 4,4'-MDI and a polyoxypropylene glycol having a molecular weight of from 400 to 2500 with a polyether polyol and a hindered amine or glycol chain extender, in the presence of a urethane-reaction promoting catalyst, optionally including a hydroxyl terminated chain extender and internal mold release agent.

Abstract: The present invention is directed to a aqueous polyurea dispersion for the preparation of an aqueous polyurea dispersion byI) dispersing in water at an NCO:NH equivalent ratio of 0.5:1.0 to 2.0:1.0a) a polyisocyanate which has an average functionality of 1.5 to 4.0 and an isocyanate content of at least 12% by weight andb) a polyamine component containingi) 30 to 70 mole percent of a polyamine having at least two primary and/or secondary amino groups and a molecular weight of at least 1000 andii) 30 to 70 mole percent of a polyamine having at least two primary and/or secondary amino groups, a molecular weight of less than 400 and at least one anionic or potential anionic group andII) allowing the polyisocyanate and polyamine component to react to form an aqueous polyurea dispersion.The present invention is also directed to the aqueous polyurea dispersion prepared by this aqueous polyurea dispersion.

Abstract: Compact or cellular elastomers containing urethane and urea groups are prepared by reactinga) at least one organic and/or modified organic polyisocyanateb) at least one N-propoxylated polyoxyalkylene-polyamine containing at least 50% of secondary amino groups or a mixture of said N-propoxylated polyoxyalkylene-polyamines and polyoxyalkylene-polyamines containing 2 to 4 primary amino groups and having a molecular weight of from 1000 to 8000,c) at least one alkyl-substituted aromatic polyamine having a molecular weight up to 500, in the presence or absence ofd) catalysts and, if desired,e) blowing agents,f) auxiliaries and/org) additives.

Abstract: Improved anionic water dispersible polyurethanes are disclosed. Polyurethane-urea polymers in aqueous dispersion are obtained by chain extending an NCO-containing prepolymer in aqueous medium. The NCO-containing prepolymer is prepared by reacting a polyisocyanate with an active hydrogen-containing compound such as a polyol and dimethylolpropionic acid (DMPA) to form a pre-prepolymer and to this is added a diamine monomer containing a pendant aliphatic, to form the prepolymer which is then dispersed in water and chain extended. The improved anionic water dispersible polyurethane polymers of the invention form excellent coatings and adhesives.

Abstract: A process for producing a condensed resin dispersion, which comprises subjecting an aldehyde and a compound condensable with the aldehyde, or their precondensate, to a condensation reaction in a dispersion medium consisting essentially of water and/or an organic solvent, to precipitate fine condensed resin particles which hardly settle in said dispersion medium, and then replacing the water and/or the organic solvent by an active hydrogen-containing compound having at least two active hydrogen-containing groups reactive with isocyanate groups.

Abstract: Aqueous dispersions contain a polyurethane which consists essentially ofa) organic polyisocyanates and, if required, minor amounts of monoisocyanates,b) dihydroxy compounds having a molecular weight of from more than 500 to 10,000 g/mol and at least 2 carboxyl or carboxylate groups in the molecule and which are obtainable by reacting dihydroxy compounds with tetracarboxylic dianhydrides in a molar ratio of from 2:1 to 1.05:1,c) if required, polyhydroxy compounds which differ from (b) and have a molecular weight of from more than 500 to 5,000 g/mol,d) if required, compounds having at least one group which is reactive toward isocyanate and at least one anionic group or group convertible into an anionic group and having a molecular weight of from 60 to 500 g/mol ande) if required, compounds which differ from d) and e) and have at least 2 groups which are reactive toward isocyanate and a molecular weight of from 60 to 500 g/mol.

Abstract: This invention relates to the production of spandex fibers made from segmented polyurethane(urea)s which are prepared from low unsaturation-containing polyols made by polymerizing alkylene oxides in the presence of a double metal cyanide complex catalyst. With the low unsaturation-containing polyols, spandex fibers can be prepared that have better physical properties than fibers prepared with PTMEG polyols.

Abstract: A two component primerless modified urethane adhesive having good adhesion can be utilized to bond various substrates together such as sheet molded compounds. The prepolymer component of the modified urethane contains a reacted hydroxyl intermediate and has a significant excess of free isocyanate. The curative component contains a polyol curing agent, an amine sag resistant agent, a phosphorus-type adhesion promoter, and optionally molecular sieves. The equivalent ratio of free NCO groups in the prepolymer component to OH groups plus any amine groups in the curative component is generally from about 0.90 to about 1.25.

Abstract: Thixotropic polyurethane systems based on a polyol component and an isocyanate component, the polyol component containing a mixture of polyamidoamine and low molecular weight, polyfunctional amines, more particularly aromatic amines, which are suitable in particular as adhesive systems for special applications.

Abstract: The present invention relates to an improved process for preparing foams comprising reacting polyisocyanates with an in situ produced stable low solids dispersion of polyureas and/or polyhydrazodicarbonamides in a hydroxyl-group-containing material as a dispersing agent by reacting:(a) organic polyisocyanates with(b) a member selected from the group consisting of (i) polyamines containing primary and/or secondary amino groups, (ii) hydrazines, (iii) hydrazides, or (iv) mixtures thereof, in(c) said hydroxyl-group-containing material.

Abstract: Fluorinated polyurethanes and polyurethane-ureas, of heat-processable, elastomeric type, constituted by rubber-like blocks and hard blocks, comprising segments derived from:(a) a macroglycol or polybutadiene-diol;(b) a perfluoropolyether-diol of formulaHO(CH.sub.2 CH.sub.2 O).sub.n --CH.sub.2 --Q--CH.sub.2 --(OCH.sub.2 CH.sub.2).sub.n OHwherein Q is a perfluoropolyether chain and "n" is comprised within the range of from 1 to 5;(c) an aromatic, aliphatic, or cycloaliphatic diisocyanate; and(d) an aliphatic, cycloaliphatic or aromatic diol or diamine, containing from 2 to 14 carbon atoms.They contain from 4 to 30% by weight of fluorine, from 10 to 60% by weight of hard components, with the molar ratio of rubber-like components (a): (b) comprised within the range of from 2 to 20. At least 80% of rubber-like segments deriving from (b) component are connected, at least at one of their sides, through a segment deriving from (c) component, with a rubber-like segment deriving from (a) component.

Abstract: A process for producing an impact-resistant polyacetal resin composition, which comprises mixing with shear a polyacetal resin (A), a thermoplastic polyurethane (B), a polyhydric alcohol (C) having at least three hydroxyl groups in the molecule and at least one compound (D) selected from the group consisting of a polyisocyanate (d.sub.1) and a compound (d.sub.2) which generates a polyisocyanate under heat, while at least two components (A) and (B) are melted. An injection-molded article from the impact-resistant polyacetal resin composition, provided by the above process, exhibits superior tensile strength and elongation at break at weld portions.

Abstract: An energy polymerizable composition comprises at least one ethylenically-unsaturated monomer, one of polyurethane precursors, and at least one epoxy monomer, and a curing agent comprising an organometallic compound, and an onium salt.

Abstract: A polyurea elastomer which exhibits a reduced moisture transfer rate is disclosed. The elastomer includes an isocyanate, an amine terminated 1,2-polyoxybutylene diol and a chain extender. The isocyanate is preferably a quasiprepolymer of an isocyanate and a material selected from at least one polyol, a high molecular weight polyoxyalkyleneamine or a combination thereof.

Abstract: The present patent application relates to a polyurethane composition for organic glasses characterized in that it comprises: a first constituent formed by a polyisocyanate at least di-functional, and a second constituent formed by an acyclic saturated monomer bearing at least three reactive functions with respect to isocyanates to form carbamate links, among which reactive functions at least 40% in number are --SH mercapto groups, the proportion of the reactive functions being at least 45% by weight with respect to the molecular weight of the monomer.

Abstract: The invention relates to a process for the production of low-gel spinning solutions-surprisingly stable in their solution viscosity-of segmented polyurethane urea elastomers in highly polar solvents, such as dimethyl formamide or dimethyl acetamide, characterized by the use of multistage jet reactor, and to a multistage jet reactor.

Abstract: The present invention is directed to the discovery that certain additives of the type described in U.S. Pat. No. 3,726,952 effectively slow down the reaction rate of certain RIM systems based upon aliphatic amine terminated polyethers.

Abstract: A crosslinked polyurethane polyurea spherically particulate polymer having an average particle diameter of 0.1 to 500 .mu.m, wherein the polymer molecule contains an isocyanurate ring in an amount of 10 to 30% by weight is disclosed. A process for producing the crosslinked polyurethane polyurea spherically particulate polymer is also disclosed.

Abstract: A corrosion inhibiting, EMI/RFI shielding composition is provided comprising a polyurethane resin which comprises a hydroxy or amine functional first polymer and an isocyanate, or isocyanurate terminated second polymer, a stabilized conductive filler, and an azole. In one embodiment of the invention a composition is provided comprising a polyurethane which comprises a fluoroolefin vinyl ether and an isocyanurate, a stabilized copper powder, and a triazole selected from the group consisting of alkyl substituted aromatic triazoles and other azoles. The invention further provides a method of composition a substrate with a composition of the invention in order to provide EMI/RFI shielding and prevent corrosion, and a substrate thus coated.