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 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: 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: 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 invention is related to an adhesive comprising a stable, fine particle size aqueous dispersion of polyurethane-urea which is the reaction product of an isocyanate-terminated prepolymer with an amine-containing chain extending agent which is characterized in that the functionality of said agent is about 2.05 to about 2.50. The adhesive was surprisingly and unexpectedly found to exhibit an increased softening point temperature as compared to the corresponding temperature of related adhesives which contains no such chain extending agent.

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.