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: This invention relates to a process for the production of a polyurethane cushion backing on a substrate. In particular, the polyurethane to be used in the process is produced by the reaction of an isocyanate and a polyol mixture, wherein the isocyanate is based on polymethylene poly(phenylisocyanate) and having a monomer content of less than 55%, a 2,2'- and 2,4'-methylene bis(phenylisocyanate) content of less than 3%, a functionality of less than 2.5, an isocyanate group content of 25 to 30%, and a urethane group content of about 2 to 6%.

Abstract: The present invention relates to a two-component, aqueous polyurethane coating composition which may be cured at ambient temperature and which containsI) a first component based on an aqueously dispersed polyurethane wherein the polyurethane hasa) an average hydroxy functionality of at least 1.8b) a total content of urethane and urea groups, calculated as --NH--C--O--, of 9 to 20% by weight, based on the weight of the polyurethane, andc) sufficient chemically incorporated anionic groups andd) ethylene oxide units incorporated within terminal and/or lateral polyether chainsto maintain the polyurethane stably dispersed in water, andII) a second component based on a water dispersible polyisocyanate wherein the polyisocyanate hasa) an isocyanate content of 2 to 30% by weight, based on the weight of the polyisocyanate,b) an average functionality of at least 1.

Abstract: The present invention is directed to a process for the preparation of an aqueous two-component polyurethane-forming composition bya) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight andb) also blending with water either before, during or after dispersing the polyisocyanate, a polyhydroxyl compound whichi) has a molecular weight of 62 to 10,000,ii) contains at least two hydroxyl groups,iii) is water soluble or water dispersible,iv) does not contain urea or urethane groups andv) is selected from the group of polyesters, polylactones, polycarbonates, polyethers, polythioethers, polyacetals, polyether esters, polyester amides and polyamides,wherein the equivalent ratio of isocyanate groups to aqueous groups is 0.8:1 to 6:1.The present invention is also directed to the aqueous composition prepared by this process and to its use as a binder for fiberglass.

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: The present invention is directed to a process for the preparation of an aqueous polyurea dispersion containing blocked isocyanate groups and unreacted isocyanate-reactive groups by(I) dispersing in watera) a polyisocyanateb) a monofunctional blocking agent which is more reactive with isocyanate groups than water andc) an amine componentII) reacting the polyisocyanate with components b) and c) to form an aqueous polyurea dispersion.

Abstract: The present invention is directed to a process for the preparation of an aqueous dispersion containing both a blocked polyisocyanate and a polyhydroxyl compound by reacting an aqueously dispersed polyisocyanate having an isocyanate content of at least 12% by weight, based on the weight of the polyisocyanate, with a monofunctional blocking agent which is more reactive with isocyanate groups than water at an equivalent ratio of monofunctional blocking groups to isocyanate groups of 0.5:1 to 2:1 in the presence of a polyhydroxyl compound which is either water soluble or water dispersible, wherein the polyhydroxyl compound is present in an amount which is sufficient to provide an equivalent ratio of hydroxyl groups to blocked isocyanate groups of 0.6:1 to 1.25:1.

Abstract: The present invention is directed to a process for the preparation of an aqueous dispersion of a blocked polyisocyanate by reacting an aqueously dispersed polyisocyanate having an isocyanate content of at least 12% by weight, based on the weight of the polyisocyanate, with a monofunctional blocking agent which is more reactive with isocyanate groups than water at an equivalent ratio of monofunctional blocking groups to isocyanate groups of 0.5:1 to 2:1. The present invention is also directed to the aqueously dispersed blocked polyisocyanates prepared by this process and to compositions containing these polyisocyanates and an isocyanate-reactive compound.

Abstract: The present invention relates to a liquid, storage-stable isocyanate having a viscosity of less than 100,000 mPa.s at 25.degree. C. and an isocyanate content of from about 10 to 29% by weight, and is prepared by reacting a solid or semi-solid diphenylmethane diisocyanate with a blocking agent. More generally, the liquid isocyanate is prepared by reacting the solid or semi-solid diphenylmethane diisocyanate with the blocking agent in quantities such that from 7 to 55% of the isocyanate groups are blocked. Preferred blocking agents are the ketoximes, and mixtures thereof.

Abstract: Novel powders useful in the slush molding process are produced by reacting an emulsion of either an isocyanate or an isocyanate reactive material with either an isocyanate reactive material or an isocyanate, depending upon the nature of the component used to make the emulsion in the presence of an at least partially blocked isocyanate and an organic carrier. The final reaction product is subsequently removed from the carrier.

Abstract: The present invention relates to an aqueous composition containinga) an at least partially blocked, aqueously dispersed polyisocyanatei) having an isocyanate content prior to blocking of at least 12% by weight, based on the weight of the unblocked polyisocyanate andii) containing at least 2 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups, andb) a trimerization catalyst.The present invention also relates to coatings or binders prepared by heating the aqueous compositions to evaporate water and initiate trimerization.

Abstract: The present invention is directed to a process for the preparation of a polyurethane coating by a) preparing a coating composition having an improved potlife fromi) a compound containing at least two hydroxyl groups,ii) a polyisocyanate containing aliphatically-, cycloaliphatically- or araliphatically-bound isocyanate groups,iii) about 0.005 to 2.0 to weight percent, based on the weight of components i) and ii), of a tine catalyst andiv) at least about 50 mole percent, based on the tin catalyst, of hydrogen chloride,b) applying the coating composition to a substrate andc) curing the coating composition, optionally in the presence of an amine vapor, to form the polyurethane coating.

Abstract: The present invention is directed to a process for the direct production of a pigmented thermoplastic polyurethane powder in finely divided form by(a) reacting with agitation at an overall equivalent ratio of isocyanate groups to isocyanate reactive groups of about 0.5 to 1.1(i) a surfactant-stabilized emulsion of fine droplets of a first reactant which has an average of about two isocyanate or isocyanate reactive groups in admixture with at least one pigment with(ii) a second reactant which contain an average of about two isocyanate or isocyanate reactive groups,in an inert organic liquid in which the first reactant, the pigment and the powder are substantially insoluble or immiscible to form particles of the powder which are protected from agglomeration by the surfactant, and(b) separating the particles of the powder from the inert organic liquid.The present invention is also directed to the pigmented thermoplastic polyurethane powders obtained by this process.

Abstract: The present invention is directed to a continuous process for the production of powdered polyisocyanate addition products in finely divided form which by simultaneously (a) mixing a polyisocyanate component, an isocyanate-reactive component and an inert organic medium containing a surfactant, wherein at least one of the components is insoluble in the inert organic medium, in a low shear stator-rotor dynamic mixer operating at speeds of about 300 to 8000 rpm, utilizing a mixing wattage of about 0.05 to 10.0 watts per cubic centimeter and having a mixing volume of at least about 0.

Abstract: The present invention is directed to an aqueously dispersed, heat-curable coating composition comprising(a) a water dispersible, blocked polyisocyanate containing chemically incorporated anionic hydrophilic groups, at least a portion of which are neutralized with volatile organic compounds,(b) a water dispersible, hydroxyl-terminated polyurethane prepolymer containing chemically incorporated anionic hydrophilic groups, at least a portion of which are neutralized with volatile organic compounds and(c) an epoxy resin which remains stably dispersed in said coating composition.The present invention is also directed to coatings prepared from the above coating composition.

Abstract: The present invention is directed to stable, aqueous dispersions of polyurethane-ureas which are formed by dispersing a blend of anionically modified isocyanate terminated prepolymer and epoxy resin in water and chain extending said dispersed blend with a polyamine having an average functionality of about 2.0 to 6.0 in an amount sufficient to provide a ratio of amino groups to isocyanate groups of about 0.6:1.0 to 1.0:1.0.The present invention is also directed to the use of the aqueous polyurethane-urea dispersions for the production of coated substrates having improved humidity resistance.

Abstract: The present invention is directed to polyisocyanates which have improved compatibility with polyester coreactants and improved solubility in apolar solvents, the polyisocyanates containing, based on solids,(a) about 15 to 85 wt. % of an isocyanurate group-containing polyisocyanate based on hexamethylene diisocynate and(b) about 15 to 85 wt. % of a biuret group-containing polyisocyanate based on hexamethylene diisocyanate.The present invention is additionally directed to two-component polyurethane coating compositions based on the above polyisocyanates and branched polyester polyols. Finally, the present invention is directed to a process for preparing the polyisocyanate.

Abstract: The present invention is directed to a coating composition produced by reacting an organic isocyanate with an active hydrogen containing organic material at an isocyanate group to active hydrogen ratio of from 1:1 to 2:1, said composition:(i) capable of swelling at least 300% by volume at a film thickness of 3 mils or less within 5 minutes after immersion in a hydrocarbon solvent,(ii) having a heteroatom content of from 1 to 12% by weight based on the total weight of the composition, and(iii) having a mean chain length between cross-linking sites of at least 4000.

Abstract: The present invention is directed to a process for the preparation of aqueous polyurethane-urea dispersions with improved hydrolytic stability by(a) forming an aqueous polyurethane-urea dispersion, optionally by chain extending an aqueously dispersed isocyanate-terminated prepolymer, containing carboxylic acid groups neutralized with volatile organic bases,(b) converting the volatile, organic base-neutralized carboxylic acid groups to nonvolatile cation-neutralized carboxylate groups by adding alkali metal salts of organic or inorganic acids having a pKa greater than 0 to the aqueous polyurethane-urea dispersion of (a) in an amount sufficient to displace at least a portion of the volatile organic bases and, optionally,(c) removing the volatile organic bases by distillation, optionally under reduced pressure.The present invention is also directed to the products produced by this process.

Abstract: The present invention is directed to a process for coating glass fibers by(1) applying an aqueously dispersed, heat-curable coating composition containing(a) a water-dispersible epoxy resin component containing external and/or chemically incorporated non-ionic emulsifiers and(b) a water-dispersible, block polyisocyanate component containing chemically incorporated anionic hydrophilic groupsin a weight ratio of component (a) to component (b) of about 1:10 to 10:1 to glass fibers and(2) curing the coating composition at elevated temperature.The present invention is also directed to the coated glass fibers produced therefrom.