Abstract: The present invention is directed to a process for sealing and/or priming concrete by applying to concrete an aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.5% by weight, based on the weight of the polyisocyanate, and is prepared bya) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight andb) optionally reacting the dispersed polyisocyanate withi) a primary or secondary monoamine containing at least one hydroxyl group in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0:1.0 to 0.7:1.0 and/orii) a polyamine having primary and/or secondary amino groups and a molecular weight of 400 or less in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0:1.0 to 0.4:1.

Abstract: Disclosed herein is a free-flowing solid of 4,4'-diisocyanato dicyclohexylmethane consisting essentially of at least 90 percent of the trans,trans isomer.

Abstract: The present invention is directed to a process for preparing an aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.

Abstract: The present invention is directed to a process for the preparation of an aqueous polyurea dispersion bya) dispersing in water at an NCO:NH equivalent ratio of 0.5:1.0 to 2.0:1.0i) a polyisocyanate which has an average functionality of 1.5 to 4.0 and an isocyanate content of at least 12% by weight andii) a polyamine having at least two primary and/or secondary amino groups and a molecular weight of at least at an NCO:OH equivalent ratio of 0.5:1.0 to 2.0:1.01000 andb) allowing the polyisocyanate and polyamine to react to form an aqueous polyurea dispersion.The present invention is also directed to the aqueous polyurea dispersion prepared by this process.

Abstract: The present invention is directed to an aqueous dispersion of an encapsulated polyisocyanate which contains ureacted isocyanate groups and is prepared bya) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight andb) reacting the dispersed polyisocyanate with a polyamine having primary and/or secondary amino groups and a molecular weight of 400 or less in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of at least 0.05:1.0.The present invention is also directed to aqueous compositions containing the previously described encapsulated polyisocyanate and an isocyanate-reactive compound.

Abstract: The present invention is directed to an aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.5% by weight, based on the weight of the polyisocyanate, and is prepared bya) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight andb) reacting the dispersed polyisocyanate withi) a primary or secondary monoamine containing at least one hydroxyl group in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0.1:1.0 to 0.7:1.0 andii) a polyamine having primary and/or secondary amino groups and a molecular weight of 400 or less in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0.1:1.0 to 0.4:1.0,wherein component i) is mixed with the dispersed polyisocyanate either before or during the mixing of component ii) and provided that the equivalent ratio of amino groups from both components i) and ii) does not exceed 0.95:1.0.

Abstract: This invention relates to radiopaque polyurethane compositions which are reaction products of(a) cycloaliphatic diisocyanates;(b) at least one polyether diol having a molecular weight of from about 500 to about 6000; and(c) an isocyanate-reactive bromine-containing compound selected from the group consisting of(i) tetrabromodipentaerythritol and(ii) a mixture of tetrabromodipentaerythritol and dibromoneopentyl glycol; and(d) optionally, a catalyst;wherein the amount of component (c) is such that bromine constitutes at least 15% by weight of the polyurethane composition, wherein the weight ratio of component (b) to component (c) is from about 2:98 to about 55:45, and wherein the components are reacted at an isocyanate index of from about 95 to about 120.

Abstract: The present invention is directed an expandable, non-sagging polyurethane composition prepared by mixing: a liquid polysocyanate with a liquid isocyanate reactive mixture. The isocyanate reactive mixture comprises i) one or more hydroxyl group containing compounds containing from 2 to 8 hydroxyl groups and having molecular weights of from about 1000 to about 6000, ii) one or more low molecular weight diols or triols having hydroxyl equivalent weights of about 200 or less, iii) one or more organic di- or polyamines, and iv) a relatively small amount of water.

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: Specified aminocrotonates are described for use as hardeners for expoxide resins.

Abstract: The present invention is directed to a one-component polyurethane or polyurea composition which may be cured at either ambient or elevated temperature and is based ona) a liquid blocked polyisocyanate wherein the isocyanate groups have been blocked with a phenolic blocking agent.b) a solid polyamine internal salt which is insoluble in and dispersed throughout the liquid blocked polyisocyanate, the solid polyamine internal salt containing at least two primary and/or secondary amino groups and at least one organic acid group.The present invention is also directed to a process for the preparation of a high molecular weight polymer by heating the one-component composition at elevated temperature or by adding a polar solvent to the above coating composition and allowing the composition to cure.

Abstract: The present invention is directed to a one-component polyurethane or polyurea composition which is based ona) a liquid blocked polyisocyanate wherein the isocyanate groups have been blocked with a phenolic blocking agent andb) a solid polyamine which is insoluble in and dispersed throughout the liquid blocked polyisocyanate,wherein the composition may be cured at elevated temperature and also at ambient temperature if the solid polyamine contains nonaromatically bound amino groups.The present invention is also directed to a process for the preparation of a high molecular weight polymer by heating the one-component composition at elevated temperature or by adding a polar solvent to the coating composition and allowing the composition to cure at ambient temperatures, provided that the solid polyamine contains nonaromatically bound amino groups.

Abstract: The present invention is directed to a one-component polyurethane or polyurea composition which may be cured at either ambient or elevated temperature and is based ona) a liquid blocked polyisocyanate wherein the isocyanate groups have been blocked with a phenolic blocking agent.b) a solid polyamine salt which is insoluble in and dispersed throughout the liquid blocked polyisocyanate, the solid polyamine salt being based on the reaction product of a polyamine with an organic or inorganic acid.The present invention is also directed to a process for the preparation of a high molecular weight polymer by heating the one-component composition at elevated temperature or by adding a polar solvent to the above coating composition and allowing the composition to cure.

Abstract: The present invention is directed to an aqueously dispersed, ambient temperature curable composition containing(a) an epoxy resin which is rendered water-dispersible by chemically incorporated emulsifiers and/or by being admixed with external emulsifiers and(b) an isocyanate-terminated prepolymer(i) which is rendered water-dispersible by chemically incorporated emulsifiers and/or by being admixed with external emulsifiers,(ii) which is prepared from a mixture containing a polyisocyanate and a compound having a molecular weight of at least 500 and at least two hydroxyl groups and(iii) wherein the isocyanate groups are blocked with a phenolic compound.The present invention is also directed to a process for preparing polyurethanes by reacting the above blends with polyamines at ambient or elevated temperature and to the polyurethanes produced therefrom.

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 a process for the production of fiberglass mats by binding fiberglass with binders based on aqueous polyisocyanate emulsions which do not contain waterglass.The present invention is also directed to the fiberglass mats produced by this process.

Abstract: The present invention is directed to a process for reducing the free monomer content of polyisocyanate adduct mixtures wherein the adduct has an average isocyanate functionality of greater than about 1.8 which comprises treating the polyisocyanate adduct mixture in the presence of 2 to about 30 percent by weight of an inert solvent, based on the weight of the polyisocyanate mixture, in an agitated thin-layer evaporator under conditions sufficient to reduce the free monomer content of the polyisocyanate adduct mixture below that level which is obtainable in the absence of a solvent.

Abstract: The present invention is directed to a continuous process for the production of aqueous polyurethane-urea dispersions by(a) mixing an emulsifiable isocyanate-terminated prepolymer with an aqueous medium in a low shear, stator-rotor dynamic mixer operating at a speed of about 500 to 8000 rpm utilizing a mixing wattage of about 0.3 to 10.0 watts/cubic centimeter and a mixing volume of at least about 0.1 liters, the average residence time of the aqueous medium and the prepolymer being about 1 to 30 seconds and the overall flow rate through the dynamic mixer being at least about 50 kg/h and(b) reacting the dispersed isocyanate-terminated prepolymer prepared in (a) with a polyamine chain extender to form an aqueous polyurethane-urea dispersion.

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.