The invention relates to storage-stable aqueous dispersions of hydrophilically modified polycarbodiimide resins, a method for producing same, and the use of a salt component to reduce carbodiimide hydrolysis in aqueous polycarbodiimide dispersions.

A process for preparing trimers and/or oligomers of diisocyanates is disclosed along with a composition of trimers and/or oligomers formed from diisocyanates and monomeric diisocyanates obtainable by reaction of I. 5-94.999% by weight of A) at least one diisocyanate having a boiling point of less than 250 C. (at standard pressure) and/or B) at least one diisocyanate having a boiling point of 250-350 C. (at standard pressure), in the presence of II. 94.999-5% by weight of C) at least one diisocyanate having a boiling point above 350 C. (at standard pressure), III. in the presence of at least one trimerization catalyst in amounts of 0.001% to 5% by weight, and the amounts of I.-III. add up to 100% by weight.

This invention discloses the use of sulfite salts as catalysts to make polyurethane polymers. In particular, this invention discloses the use of metal salts such as alkali metal salts as well as alkyl ammonium salts such as tetralkyl ammonium salts as catalysts to make polyurethane polymers. The sulfite salts are useful to make a wide variety of polyurethane polymers and polyurethane foam polymer products such as flexible polyurethane foam polymers, rigid foam polyurethane polymers, semi-rigid polyurethane polymer, microcellular polyurethane polymer, and spray foam polyurethane polymer as well as any polymeric material that requires the assistance of catalysts to promote the formation of urethane and urea bonds such as those found in polyurethane emusions for paints, coatings, protective coatings, lacquer, etc as well as other polyurethane or polyurethane containing materials such as thermoplastic polymers, thermoplastic polyurethane polymers, elastomers, adhesives, sealants, etc. Examples of catalysts comprising the invention include sodium sulfite, potassium sulfite, lithium sulfite, tetramethylammonium sulfite and the like.

The present invention relates to a polyol composition for obtaining a polyurethane foam through a reaction with a polyisocyanate compound. The polyol composition comprises a polyol, a catalyst, a foam stabilizer, a foaming agent, and ammonium carboxylate, wherein the ammonium carboxylate has a quaternary ammonium cation as a cationic moiety, and a carboxylic acid anion represented by formula (1) as an anionic moiety.

Isocyanate-modified polyester-epoxide polymer (i-PEEP) compositions are disclosed. The i-PEEP compositions comprise a reaction product of a polyepoxide compound, a polyisocyanate, and a polyester polyol composition. The ratio of epoxy equivalents to hydroxyl equivalents is within the range of 0.2 to 2. The i-PEEP index as defined herein is within the range of 100 to 200. The i-PEEP composition has a T.sub.g within the range of 30 C. to 35 C. Low- and elevated-temperature processes catalyzed by bases or Lewis acids for making the i-PEEP compositions are also disclosed. In a simple yet innovative approach, a new class of polymers useful for coatings, elastomers, adhesives, sealants, and other valuable products is assembled from readily available starting materials without reliance on the polyamines typically used to cure epoxy systems.

Polyisocyanate composition containing (A) at least one polyisocyanate obtainable by reacting at least one monomeric isocyanate, (B) at least one solvent containing a mixture of C7-C14 aromatic hydrocarbons, (C) optionally at least one further solvent, (D) optionally at least one Lewis-acidic organic metal compound capable of accelerating the reaction of isocyanate groups with isocyanate-reactive groups, (E) optionally other coatings additives,
wherein the amount of cumene in component (B) is less than 1 wt %, preferably less than 0.7 wt %.

This invention discloses the use of sulfite salts as catalysts to make polyurethane polymers. In particular, this invention discloses the use of metal salts such as alkali metal salts as well as alkyl ammonium salts such as tetralkyl ammonium salts as catalysts to make polyurethane polymers. The sulfite salts are useful to make a wide variety of polyurethane polymers and polyurethane foam polymer products such as flexible polyurethane foam polymers, rigid foam polyurethane polymers, semi-rigid polyurethane polymer, microcellular polyurethane polymer, and spray foam polyurethane polymer as well as any polymeric material that requires the assistance of catalysts to promote the formation of urethane and urea bonds such as those found in polyurethane emusions for paints, coatings, protective coatings, lacquer, etc as well as other polyurethane or polyurethane containing materials such as thermoplastic polymers, thermoplastic polyurethane polymers, elastomers, adhesives, sealants, etc. Examples of catalysts comprising the invention include sodium sulfite, potassium sulfite, lithium sulfite, tetramethylammonium sulfite and the like.

Coated substrates and methods may comprise a multi-unit carbodiimide. The multi-unit carbodiimide may also be combined with a siloxane. The multi-unit carbodiimide and/or the siloxane may be used in a surface coating applied to a substrate, and an overcoat may be applied to the surface coating. The surface coating may chemically interact with the overcoat and/or the substrate to improve corrosion resistance and other properties of the coated substrate.

The invention relates to a novel process for preparing carbodiimides comprising the steps of a) carbodiimidization of isocyanates in the presence of a catalyst, b) separation of the catalyst and/or monomeric isocyanate from the carbodiimide by distillation or extraction to obtain a crude carbodiimide comprising monomeric isocyanate, c) addition of one or more alcohols and partial or complete reaction of the alcohol with the monomeric isocyanate of the crude carbodiimide.

The invention is related to a process for producing an isocyanate-group terminated polyoxazolidinone composition comprising the copolymerization of a polyisocyanate compound with two or more isocyanate groups with a polyepoxide compound with two or more epoxy groups in the presence of phosphorous and/or antimony catalyst, wherein the molar ratio of the isocyanate groups of the polyisocyanate compound to the epoxy groups of the polyepoxide compound is larger than 2:1 and less than 25:1, and wherein the process is conducted in the absence of a solvent with a boiling point higher than 200? C., at 1 bar (absolute). The invention is also related to the resulting isocyanate-group terminated polyoxazolidinone compositions and a process for producing an isocyanate-group terminated polyoxazolidinone by removal of a solvent and/or unreacted polyisocyanate compound.