Abstract: An aqueous polyurethane resin is prepared by reaction of an isocyanate group-terminated prepolymer with a chain extender containing polyamine. The isocyanate group-terminated prepolymer is obtained by reaction of at least a polyisocyanate containing 50 wt % or more of a non-multiple ring polyisocyanate that does not contain an aromatic ring and an aliphatic ring, or contains one aromatic ring or aliphatic ring; polyoxyethylene polyol; and a polyoxyethylene side chain-containing active compound having two or more hydroxyl groups or isocyanate groups at its molecular terminal and having a polyoxyethylene group in the side chain.

Abstract: The instant invention provides polyamides, processes for making the polyamides, and articles comprising the polyamides.

Abstract: A peel-treating agent comprising a reaction product of an aliphatic isocyanate having an aliphatic group of at least 8 carbon number with an ethylene/vinyl alcohol copolymer or polyvinyl alcohol as an effective component, wherein a bisurea form content in the reaction product is at most 3 wt %.

Abstract: A peel-treating agent comprising a reaction product of an aliphatic isocyanate having an aliphatic group of at least 8 carbon number with an ethylene/vinyl alcohol copolymer or polyvinyl alcohol as an effective component, wherein a bisurea form content in the reaction product is at most 3 wt %.

Abstract: Fast curing surgical adhesives and sealants contain an NCO-terminated hydrophilic urethane prepolymer derived from an aromatic diisocyanate and a polyol. Substantially all the aromatic diisocyanate used to prepare the NCO-terminated hydrophilic urethane prepolymer is in the para form. Optionally, the aromatic diisocyanate is substituted with at least one electron withdrawing group, such as, for example, a fluorine group.

Abstract: A method of applying an adhesive to a substrate is disclosed which utilizes a hydrophilic, high molecular weight, nonionic polyurethane adhesive. The polyurethane adhesive is soluble in water and a 1% by weight solution of the adhesive in water at 20% has a specific viscosity of at least 0.4.

Abstract: Claimed is a non-porous, waterproof film having a water vapor permeability of at least 1000 g/m2 day, based on a thermoplastic polyurethane, wherein the polyurethane is composed of a) 40 to 52 wt. % of polyether glycol having an atomic ratio of carbon to oxygen in the range of 2,0 to 4,3, with at least 30 wt. % of the polyurethane being composed of a polyether glycol having an atomic ratio of carbon to oxygen in the range of 2,0 to 2,4, b) 30 to 45 wt. % of polyisocyanate, calculated as 4,4′-diphenyl methane diisocyanate, c) 0,5 to 10 wt. % of araliphatic diol, and d) 5 to 20 wt. % of low-molecular weight chain extender, calculated as 1,4-butane diol, less the amount of araliphatic diol. Also claimed is the use of these films in rainwear, shoes, tents, seats, as mattress covers, as understating, in garments for medical purposes, and for the manufacture thereof of wound dressings.

Abstract: A polyurethane is described which is a reaction product of at least one isocyanate containing material having at least two isocyanate groups and at least one compound having at least two hydrogen atoms capable of reacting with the isocyanate. The compound having the at least two hydrogen atoms contains a hydroxyalkanoate, which is preferably a thermally decomposable or a biodegradable polyhydroxyalkanoate. The polyurethane of the present invention can be used in a number of applications and preferably has improved properties such as, but not limited to, improved flexibility and/or improved hydrophobicity. The polyurethanes of the present invention are preferably biodegradable and easily recycled.

Abstract: 1. A coating composition to form a coating layer or film of a hydrophilic polyurethane resin having a moisture permeability and being substantially non-porous, which comprises, as an essential component, an isocyanate group-containing prepolymer obtainable by reacting diphenylmethane diisocyanate with the following polyoxyalkylene polyol: A polyoxyalkylene polyol which contains at least 60 wt % of a polyoxyethylene polyol having at least three hydroxyl groups and having an oxyethylene group-content of at least 10 wt %, satisfies 3.0<n<3.5, where n is the average number of hydroxyl groups, and has an average oxyethylene group-content of from 60 to 90 wt %.

Abstract: A hydrophilic, high molecular weight nonionic polyurethane, characterized by solubility in water and by a specific viscosity of at least 0.4 (1% by weight solution at 20° C.) is provided. Examples of such polyurethanes are those characterized by the following structural units: a) —O(—CH2—CH2—O)n—, where n=8 to 500, and b) —CO—NH—X—NH—CO—, where X is an aliphatic or cycloaliphatic radical. Also provided are methods of using the polyurethane as an adhesive, more particularly a hotmelt adhesive or a solvent-based adhesive, for example a wallpaper adhesive and labelling adhesive, of using polyurethane as a stabilizer in the emulsion polymerization of, in particular, vinyl acetate and vinyl chloride and in the copolymerization of ethylene and vinyl acetate, and of using the polyurethane as a thickener for aqueous systems, more particularly together with nonionic surfactants.

Abstract: An improved polyurethane is prepared by reacting a diol, an organic diisocyanate and a carboxylic acid with a critical selection of the amount of water in the reaction mixture. The polyurethane has improved adhesion, hydrophilicty and strength. The polymer has improved feel, and washability. Solutions of the polymer have low viscosity in aqueous solutions.

Abstract: A hydrophilic polyol having a molecular weight of less than about 4500 and comprising ethylene oxide units and alkylene oxide units selected from propylene oxide, butylene oxide and mixtures thereof in a weight ratio of ethylene oxide units to alkylene oxide units in the range of from about 95:5 to about 60:40, the polyol having a secondary hydroxyl content of at least about 80% based on the total hydroxyl content of the polyol. A process for producing the hydrophilic polyol is also described.

Abstract: Detergent formulation for washing laundry characterized in that it comprises:from about 10 to 80% of its weight of at least one hydrated zeolite (z) of formulaxNa.sub.2 O.yAl.sub.2 O.sub.3.zSiO.sub.2.wH.sub.2 Oin which, if y=1, x is from about 0.7 to 1.1, z is from about 1.3 to 3.3 and w is from about 10 to 264from about 0.005 to 5%, of its weight of a least one polyalkylene terephthalate-polyoxyalkylenebisurethane (PET-UPOEU) copolymeric nonionic or anionic anti-soiling agent, said copolymer being obtained by reaction of a polyalkylene terephthalate (PET) and a polyoxyalkylnebisurethane (UPOEU), the molar ratio of the NCO functions to all of the OH functions or OH function equivalents being from about 0.5 to 1,from about 3 to 40%, of its weight of a least one saturated C.sub.5 -C.sub.24, aliphatic or hydroxyaliphatic alkyl sulphate anionic surfactant (FAS) optionally condensed with approximately 0.

Abstract: A hydrophobic polyurethane elastomer composition is disclosed containing a linear soft segment without pendant chain branched groups, wherein said polyurethane elastomer has a glass transition temperature (Tg) of less than -70.degree. C. and a moisture uptake of less than 1.0 wt. % after 24 hours of immersion in water at 70.degree. C., and wherein said polyurethane elastomer comprises at least one repeat unit containing said linear soft segment, which soft segment comprises a moiety derived from a polyol of the structure:X--[CH.dbd.CH(CH.sub.2).sub.n ].sub.m CH.dbd.CH--Xwherein X is a hydroxyl-containing moiety selected from the group consisting of --CH.sub.2 OH, --(CH.sub.2).sub.8 COO(CH.sub.2).sub.p OH and --COO(CH.sub.2).sub.p OH, wherein the functionality number of the terminal groups is 2.0, p is 2 to 12, n is 1 to 10, m is a number average value of up to 1000, and the weight of the polyol is from about 0.5 wt. % to about 99.5 wt. % of the resulting polyurethane elastomer.

Abstract: Polyurethane polymers useful as hydrogels wherein the polyol is a specific polyol of block copolymers and a method for desalination of water.

Abstract: Affinity matrices useful for the chromatography and immobilization of biological materials and the method of preparing and using the same are disclosed. The affinity supports are based on hydrated polyurethane polymers which have been activated to provide a means for covalently attaching a variety of bioaffinity agents. The hydrated polymer matrices are characterized by their biocompatibility and resistance to nonspecific protein adsorption. Preferably, the prepolymers used to prepare the hydrated polymers are isocyanate-capped oxyethylene-based diols or polyols, at least 75% of said diols and polyols having a molecular weight of 7000 to about 30,000.

Abstract: Polyurethane polymers useful as hydrogels wherein the polyol is a specific polyol of block copolymers and a method for desalination of water.

Abstract: The present invention relates to water dilutable, urethane group-containing polyester polyols having an acid number of 6 to 45 mg KOH/g, wherein 25 to 100% of the acid groups are neutralized by bases, a hydroxyl number of 20 to 250 mg KOH/g, a molecular weight (M.sub.w) of 2,000 to 150,000 and a urethane content (--NH--CO--O--) of 2 to 16% by weight, wherein the polyester polyol is the at least partly neutralized reaction product ofa) 35 to 90% by weight of branched polyester polyols having a hydroxyl number of 40 to 600 and prepared froma1) 0 to 60% by weight of monocarboxylic acids,a2) 6 to 65% by weight of di- and/or tricarboxylic acids or their anhydrides,a3) 10 to 70% by weight of alcohols,a4) 0 to 35% by weight of monoalcohols,a5) 0 to 30% by weight of hydroxycarboxylic acids, aminocarboxylic acids, lactones, lactams and aminoalcohols anda6) 0 to 45% by weight of polycarbonate polyols,b) 0.5 to 8.5% by weight of hydroxycarboxylic acidsc) 0 to 15% by weight of compounds containing OH, NH and/or NH.sub.

Abstract: The invention relates to a dry cleaning solvent resistant hydrophilic urethane polymer having about 0.5 to 10 weight percent of a hindered phenolic antioxidant reacted into its structure. The invention also relates to a hindered phenolic antioxidant capable of being reacted into the polymer. The invention also relates to a dry cleaning solvent resistant waterproof, moisture-vapor permeable material such as a laminate or a unitary sheet material.

Abstract: The present invention relates to coating compositions containing(A) 70 to 98% by weight, based on the sum of components (A) and (B), of(a) isocyanate-free polymers of ethylenically unsaturated monomers and/or polyurethanes or blocked isocyanate prepolymers, and(b) optional organic solvents,wherein component (A) contains no significant quantities of groups capable of reacting with component (B) or starting materials thereof and has a viscosity (at 23.degree. C.) of 2000 to 100,000 mPa.s;(B) 2 to 30% by weight, based on the sum of components (A) and (B), of a polyaddition product prepared in and dispersed in component (A), wherein the polyaddition product is a polyurethane, polyurethane urea, polyurea, or mixture thereof, containing ionic groups and/or potentially ionic groups in a quantity corresponding to from 0.

Abstract: A urethane prepolymer composition useful as sealant is disclosed. The composition comprises a reaction product of an organic polyisocyanate and a polyether polyol mixture at an NCO/OH equivalent ratio from 1.6 to 2.5. The polyether polyol mixture contains (a) from 75 to 95 % by weight of the mixture of a polyoxyalkylenediol having an average MW from 400 to 1,000 and an oxyethlene unit content greater than 50 % by weight, and (b) the balance of the mixture of a polyoxyalkylenetriol having an average MW from 5,000 to 10,000 and an oxyethylene unit content greater than 50 % by weight. An equivalent composition is produced by reacting the polyoxyalkylenediol and polyoxyalkylenetriol with the organic polyisocyanate separately and mixing together after the reaction.

Abstract: The present invention relates to hydrophilic polyurethanes having a content of (i) olefinic double bonds (expressed as C.dbd.C, molecular weight 24) of at least 1.0% by weight and (ii) ethylene oxide units incorporated through polyethylene glycol of 20 to 80% by weight, which are based on the reaction product ofa) 1.0 mole of a polyisocyanate component consisting of at least one organic polyisocyanate withb) 0.3 to 2.5 moles of at least one .beta.,.gamma.-ethylenically unsaturated ether alcohol containing 5 to 29 carbon atoms,c) 0 to 1.0 mole of at least one synthesis component containing at least two isocyanate-reactive groups and having a molecular weight of 62 to 2,000 andd) 0.25 to 0.85 moles of a polyethylene glycol component containing at least one polyethylene glycol having a molecular weight of 1,300 to 5,000,at an NCO/OH equivalent ratio, based on starting components a) to d), of 0.7:1 to 1.2:1.

Abstract: A flexible, lubricious organic polymeric coating is formed by applying a mixture of an isocyanate, a polyol, poly(ethylene oxide), and carrier liquid to a surface to be coated. The carrier liquid is removed and the mixture reacted to form a polyurethane coating with associated poly(ethylene oxide) giving a highly lubricious, abrasion resistant, flexible coating particularly suitable for use as a protective lubricious coating on devices introduced into the body.

Abstract: Surgical adhesives, comprising an NCO-terminated hydrophilic urethane prepolymer derived from an organic polyisocyanate and a polyol component comprising a polyester polyol derived from an electron-attracting group-containing dicarboxylic acid, such as 2-ketoglutaric acid, are capable of being easily hydrolyzed within a living body after a certain period of time.

Abstract: Polymer-coated medical and laboratory devices are disclosed which are characterized by their biocompatibility and resistance to nonspecific protein adsorption. The polyurea-polyurethane coatings of this invention are prepared from high molecular weight isocyanate end-capped prepolymers substantially or exclusively comprised of ethylene oxide units. At least 75%, preferably at least 90%, of the prepolymer units are oxyethylene-based diols or polyols having molecular weights of about 7000-30,000, with essentially all of the hydroxyl groups capped with polyisocyanate prior to formation of the hydrated polymer coating.

Abstract: A non-toxic hydrophilic polyurethane elastomer having less than about 0.5% by weight extractables and which is curable in the absence of heat is disclosed. The elastomers are prepared from suitable hydrophilic polyurethane oligomers in combination with suitable ultraviolet light absorbers which become chemically bound into the elastomer during the polymerization (curing) thereof and thus become essentially non-extractable therefrom.

Abstract: A water dispersible, modified polyurethane which is the reaction product of polyisocyanate, polyether polyol, modifying agent containing at least one pendant hydrophobic group and at least two active hydrogen moieties and capping agent. The modified polyurethane may also include a second type of modifying agent which does not have a pendant hydrophobic group. The modified polyurethane can be prepared by reacting the polyisocyanate and the polyether polyol and then adding the capping agent and finally the modifying agent with or without the second modifying agent. The modified polyurethane resists microbial attack, exhibits superior efficiency in thickening aqueous compositions under high shear conditions and achieves acceptable sag and leveling.

Abstract: Elastomeric or flexible surgical adhesives, comprising (i) a NCO-terminated hydrophilic urethane prepolymer derived from a fluorine-containing polyisocyanate and a hydrophilic polyether polyol of higher oxyethylene content, or a combinatioin of (i) with (ii) an unsaturated cyano compound containing a cyano group directly bonded to a polymerizable double bond, exhibit low toxicity, may be safely used for bonding of tissues and possess a rapid cure rate and sufficient bonding power.

Abstract: A coating composition for forming a substantially non-porous moisture-permeable coating layer or film of a hydrophilic polyurethane resin, which comprises a polyol combination and a polyisocyanate compound, or a prepolymer or polyurethane resin obtained by reacting them, said polyol combination comprising:(a) from about 50 to about 98% by weight of a polyoxyethylene polyol having an oxyethylene group content of from about 50 to about 90% by weight, a hydroxyl valve of from about 15 to about 60 and at least 3 hydroxyl groups; and(b) from about 2 to about 50% by weight of a diol having a molecular weight of from about 62 to about 2,000 which may contain oxyethylene groups;provided that the molar equivalent ratio of the component (b) to the component (a) is from about 0.2 to about 5, and the total oxyethylene group content in the components (a) and (b) is at least about 70% by weight.

Abstract: A class of modified hydrophilic prepolymers and polymers is disclosed which are characterized by their specific reactivity. Isocyanate-capped oxyethylene-based prepolymers are modified by reacting with a compound having an isocyanate-reactive group which is a sulfhydryl group, an amino group, a hydroxyl group or a carboxyl group, and a non-isocyanate-reactive group, in quantities sufficient to modify at least a portion of the isocyanate groups of the prepolymer. Where said first functional group is an amino group contained in a diamine or polyamine compound or is a carboxyl group, the modifying compound is present in quantities sufficient to modify all or substantially all of the isocyanate groups of the prepolymer.

Abstract: Hydrophilic polymeric soft contact lenses which are characterized by their biocompatibility and resistance to nonspecific protein adsorption. At least 75%, preferably at least 80%, of the prepolymers from which the lenses are prepared are isocyanate-capped oxyethylene-based diols or polyols having molecular weight of about 7000-30,000. Essentially all of the hydroxyl groups of the diols or polyols are capped with polyisocyanate prior to formation of the hydrated polymer of which the contact lenses are made.

Abstract: An organic solvent soluble active agent containing water-insoluble hydrophilic hydrogel comprising a copolymer of (A) a water-soluble monoolefinic monomer or a mixture thereof optimally containing up to 50% thereof of one or more water-insoluble mono-olefinic monomers and (B) a terminally diolefinic hydrophobic macromer containing polypropylene oxide or polytetramethylene oxide units prepared in the presence of an effective macromer expanding amount of a macromer soluble compound of the formulaR'--R"--O.sub.n R"'where R', R", R"' and n are as defined in the claims, hydrogels useful in the loading of such active agents, their preparation, and use are disclosed.

Abstract: A hydrophilic, thermoplastic polyurethane polymer of improved dimensional stability and mechanical strength having an average molecular weight of from about 10,000 to about 200,000 produced by reacting (A) an organic diisocyanate with (B) a blend of glycol components comprising (i) ethylene glycol and/or diethylene glycol, (ii) a polyoxyethylene glycol having an average molecular weight of from about 400 to about 20,000 and (iii) a polyoxypropylene glycol having an average molecular weight of from about 200 to about 2500, and (C) water in an amount up to about 0.5% by weight of the reaction mixture. The polymers are particularly useful in the form of a film product such as gloves and condoms. Other uses are as low friction coatings, body implants and active agent release media.

Abstract: This invention is a polyurethane and/or polyurea elastomer prepared in the reaction of:(a) an organic polyisocyanate;(b) a chain extender and(c) a polyether having a molecular weight from about 500 to about 10,000, which polyether is a block copolymer of ethylene oxide and butylene oxide comprising an internal poly(EO) block bonded on each side to a poly(BO) block, wherein oxybutylene moieties comprise from about 10 to about 90 percent of the total weight of the polyether.

Abstract: Elastomeric or flexible surgical adhesives, comprising [A] NCO-terminated hydrophilic urethane prepolymer derived from hydrophilic polyether polyol of higher oxyethylene content, or combination of [A] with [B] unsaturated cyano compound containing cyano group attached to a carbon atom constituting the polymerizable double bond, are used for bonding of tissues, with rapid cure rate and sufficient bonding power.

Abstract: There are provided moisture-permeable, antistatic, and oil-resistant work gloves made of film of water-insoluble, hydrophilic polyurethane resin having hydrophilic groups and/or hydrophilic segments in the main chains and/or side chains. They are produced by applying an organic solvent solution of water-insoluble, hydrophilic polyurethane resin having hydrophilic groups and/or hydrophilic segments in the main chains and/or side chains, to the surface of a glove form or the surface of a glove form on which is put a glove substrate, drying the applied solution, and stripping the deposit film from the form.

Abstract: The present invention is directed to a polyisocyanate preparation dispersible in water and having an average NCO functionality of about 2.0 to 3.5 which contains(a) an aliphatic polyisocyanate or a mixture of aliphatic polyisocyanates; and(b) a quantity of an emulsifier sufficient to ensure the dispersibility of the polyisocyanates.The present invention is also directed to the use of this polyisocyanate preparation as an additive for aqueous adhesives based on polymers dispersed in water.

Abstract: A water dispersible, modified polyurethane which is the reaction product of polyisocyanate, polyether polyol, modifying agent containing at least two active hydrogen moieties and capping agent. The modified polyurethane is preferably prepared by reacting the polyisocyanate, the polyether polyol and the modifying agent and then adding the capping agent. The modified polyurethane resists microbial attack, exhibits superior efficiency in thickening aqueous compositions and imparts improved leveling.Included among the modifying agents are ethylene diamine, 1,6-diaminohexane, 1,10-diaminodecane, N-phenyl-p-phenylenediamine, succinic acid, suberic acid, sebacic acid, 1,10-decanedicarboxylic acid, 1,4-benzene-dicarboxylic acid, ethanolamine, 2-(ethylamino)ethanol, and p-carboxyphenol and mixtures thereof.

Abstract: Polyurethane polyene compositions are obtained by reacting from about 10 to about 50 parts by weight of a polyene in the presence of about 100 parts by weight of a hydrophilic polyurethane resin. The resulting products will swell and increase in weight upon immersion in water and are permeable to gases, moisture vapor ions, and other low molecular weight species. The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are dimensionally stable after repeated exposure to boiling water and exhibit memory.

Abstract: Gas and ion permeable membranes useful as burn dressings, surgical drapes and the like formed of polyurethane diacrylate compositions obtained by reacting a diacrylate in the presence of from about 65 to about 95 weight percent of a hydrophilic polyurethane resin. The compositions will form a hydrogel upon immersion in water and are also permeable to other low molecular weight species. The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are dimensionally stable after repeated exposure to boiling water and exhibit memory.

Abstract: Canulae formed of or having a coating of polyurethane diacrylate compositions obtained by reacting a diacrylate in the presence of from about 65 to about 95 weight percent of a hydrophilic polyurethane resin. The compositions will form a hydrogel upon immersion in water and are permeable to gases, ions and other low molecular weight species. The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are dimensionally stable after repeated exposure to boiling water and exhibit memory.

Abstract: A method of forming a hydrophilic urethane prepolymer comprising the steps of reacting an isocyanate compound to a hydrophilic polyether or polyester compound which has been heated to such a temperature that the temperature of the reactants after addition of isocyanate is at least as high as about 120.degree. C. The resulting urethane prepolymer may be reacted with water to form a cellular urethane polymer.

Abstract: Polyurethane diacrylate compositions are obtained by reacting a diacrylate in the presence of from about 65 to about 95 weight percent of a hydrophilic polyurethane resin. The compositions will form a hydrogel upon immersion in water and are permeable to gases, ions and other low molecular weight species. The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are dimensionally stable after repeated exposure to boiling water and exhibit memory. The compositions are useful as carriers for pharmacologically active agents in forming an oral delivery system.

Abstract: The invention is a polyurethane comprising the reaction product of(a) a 1,4-lactone of 3,6-anhydropentahydroxyhexanoic acid; and(b) an organic polyisocyanate.The polyurethanes of this invention are useful in coatings, compression moldings, control release systems, films, foams and the like.

Abstract: Surgical implants, intrauterine devices and the like formed of polyurethane diacrylate compositions obtained by reacting a diacrylate in the presence of from about 65 to about 95 weight percent of a hydrophilic polyurethane resin. The compositions will form a hydrogel upon immersion in water and are permeable to gases, ions and other low molecular weight species. The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are dimensionally stable after repeated exposure to boiling water and exhibit memory. The shaped products contain distributed therein a desired medicament.

Abstract: An antithrombogenic material is composed of a fluorine-containing block polymer obtained by the polyaddition or polycondensation of a prepolymer with a chain extender, said prepolymer being a diisocyanate prepolymer represented by the formulaOCN--CH.sub.2 RfCH.sub.2 NHCOO--A--CONH].sub.m CH.sub.2 RfCH.sub.2 NCO (I)wherein Rf is a perfluoroalkylene or perfluoroxyalkylene group having from 1 to 20 carbon atoms and containing from 0 to 10 ether linkages, A is a divalent organic group containing an oxygen atom in its main chain and m is from 1 to 3, or a dicarbamate prepolymer obtained by reacting the diisocyanate prepolymer with a lower alcohol.

Abstract: Articles of commerce which are transparent at a first temperature and less transparent at a second temperature which is different from said first temperature and which are capable of reverting to the original state of transparency are obtained by curing compositions containing at least one isocyanate-functional monomeric or polymeric material which may or may not contain hydrophilic centers consisting essentially of ethylene oxide units having the structure (CH.sub.2 CH.sub.2 O).sub.n, wherein n is at least two. When the isocyanate-functional material does not contain such hydrophilic centers, it must be cured in the presence of at least one monomeric or polymeric material which may or may not be reactive with isocyanate groups but must contain such hydrophilic centers. Thermosensitivity is imparted to the cured products by the presence of water in the cured material.

Abstract: This invention relates to novel hydrophilic, crosslinked, polyurea-urethane, solid, discrete particles formed by adding in droplet form a hydrophilic prepolymer comprising an isocyanate-capped polyol or mixtures thereof wherein said polyol or mixture of polyols has a reaction functionality greater than two, the total of said polyol present having an ethylene oxide content of at least 40 weight percent, before capping to a large excess of a stirred aqueous reactant. The resultant solid particles can be molded into various shapes as desired or used for coating or adhesive applications.

Abstract: Urethane resins containing, as latent hardeners, the reaction products of an acid anhydride or imide, such as phthalic anhydride, and an aromatic or cycloaliphatic polyamine, said resin systems being stable for long periods when stored at ambient or moderately elevated temperatures while providing on curing for relatively short periods at elevated temperatures, on the order of 100.degree.-150.degree. C., hardened products of good properties.

Abstract: An antithrombogenic, highly elastic polyurethane compound produced by the reaction of a polyether diol with a diisocyanate and a diamine, which polyurethane compound is characterized by said polyether diol being a compound of the general formula: ##STR1## wherein, a, b, and c each denote a positive integer and having a polyoxyethlene content in the range of from 10 to 50 weight percent and an average molecular weight in the range of from 500 to 5,000.