Abstract: An at least two-step process for the preparation of polyamide resins wherein, in the first step, polyvalent carboxylic acids, optionally together with monovalent carboxylic acids, are reacted with a stoichiometric deficiency of polyamines in the presence of an organic solvent which forms an azeotrope with water, water is distilled off, and the reaction is controlled by means of the amount of water formed by the condensation reaction and, optionally, by the imidazoline formation. After removal of the theoretical amount of water or a lesser amount, in a further step more amine is added to the reaction mixture in an amount sufficient to achieve a final amine number of 10 to 300 mgKOH/g, the reaction is continued, substantially all of the residual water is removed, and the residual solvent is completely or partially removed.

Abstract: The present invention relates to a process for the dehydration of a gas, particularly of a gas where the gas values should all be substantially recovered as dehydrated gas. The process uses membrane dryers and provides a sweep gas for each of the dryers. The sweep gas is substantially recovered and used again as a sweep gas. The process is economical and can process large quantities of gas.

Abstract: This invention relates to an improvement in a process for the catalytic amination of an allylic alcohol of the formula:CH.sub.2 .dbd.CR--CH.sub.2 OHwhere R is hydrogen or methyl with ammonia or an amine of the formula R.sub.1 R.sub.2 NH where R.sub.1 and R.sub.2 represent hydrogen or a C.sub.1-5 hydrocarbyl group in the presence of an effective amount of a phosphorous containing catalyst to effect reaction between the allylic alcohol and the ammonia or amine to produce an allylic amine. The improvement in the process resides in utilizing a neutral group IIA metal phosphate as a catalyst component. Calcium phosphate is preferred and the catalyst.

Abstract: A method for preparing a polyurethane foam which comprises reacting an organic polyisocyanate and a polyol in the presence of a blowing agent, a cell stabilizer and a catalyst composition consisting essentially of 0-50 mole % compound I and 50-100 mole % compound II: ##STR1## wherein R is hydrogen, a C.sub.1 -C.sub.4 alkly, C.sub.6 -C.sub.8 aryl, or C.sub.7 -C.sub.9 aralkyl group; andn is 2 to 8.

Abstract: A curable epoxy resin composition comprising a polyepoxide resin and an amine curative characterized in that the amine curative comprises a partially methylated polyalkylene polyamine having at least three amine nitrogens and at least two active amine hydrogens.

Abstract: A new epoxy hardener composition is the product of the reaction of (A) a poly(alkylene oxide) monoamine or diamine with a molecular weight (Mn) of about 500 to 3000 and (B) a di- or polycarboxylic acid, in a ratio of moles of carboxylic acid to equivalents of amine of about 1:1 to 6:1 to yield an intermediate (C), which in a second step is reacted with (D) a di- or polyamine. The compositions of the invention are excellent emulsifiers of liquid epoxy resins in aqueous media without the addition of added surfactants or acidic compounds, and can be used to prepare water resistant water-borne coatings and related products from both liquid and solid epoxy resins, that possess long pot lives and contain relatively small amounts of volatile organic compounds.

Abstract: This invention pertains to aqueous emulsions containing water insoluble, vinyl polymer particles containing polymerized N-vinyl formamide (NVF) units converted to water insoluble vinyl acetate polymers containing cationic, amine functional units. These latex dispersions are prepared by the emulsion polymerization of an ethylenically unsaturated monomer and N-vinyl formamide. Preferably, vinyl acetate, optionally with other ethylenically unsaturated monomers, are used to form the copolymer. The copolymer then is selectively hydrolyzed via acid hydrolysis of the N-vinyl formamide group to form water insoluble polymer particles.

Abstract: A method for preparing a polyester flexible slabstock polyurethane foam which comprises reacting an organic polyisocyanate and a polyester polyol in the presence of a blowing agent, optionally a cell stabilizer and a catalyst composition consisting essentially of N-methylimidazole or 1,2-dimethylimidazole, or both.

Abstract: A new epoxy hardener composition is the product of the reaction of (A) a poly(alkylene oxide) monoamine or diamine with a molecular weight (Mn) of about 500 to 3000 and (B) a di- or polycarboxylic acid, in a ratio of moles of carboxylic acid to equivalents of amine of about 1:1 to 6:1 to yield an intermediate (C), which in a second step is reacted with (D) a di- or polyamine. The compositions of the invention are excellent emulsifiers of liquid epoxy resins in aqueous media without the addition of added surfactants or acidic compounds, and can be used to prepare water resistant water-borne coatings and related products from both liquid and solid epoxy resins, that possess long pot lives and contain relatively small amounts of volatile organic compounds.

Abstract: A method for preparing an aqueous adhesive polyurethane/acrylic polymer dispersion by reacting a polyol, a carboxylic acid-containing polyol and a polyisocyanate to form an anionic, water dispersible prepolymer, subsequently chain extending to form the polyurethane component of the polyurethane/acrylic polymer and polymerizing at least one acrylic monomer in the presence of the prepolymer and/or polyurethane to form the acrylic polymer component, characterized by using isophorone diisocyanate as the polyisocyanate and performing the chain extension with a composition comprising a monofunctional amine and a difunctional amine in a 1:4 to 4:1 weight ratio.

Abstract: A class of unsaturated resins which are suitable for use in radiation curable coatings has been developed. The resins comprise N-vinyl-N-acyl oligomers made by reacting a secondary N-vinylamide with a polyisocyanate monomer which is reacted with at least one mono- or polyhydric alcohol to form a urethane linkage.

Abstract: This invention relates to an improvement in a process for the production of amines and particularly secondary amines by the hydrogenation of aliphatic and aromatic nitriles and disproportionation of the resulting primary amine containing feedstock. The improvement resides in the use of a bimetallic catalyst comprising nickel or cobalt in combination with rhodium, ruthenium or palladium platinum. Optionally, the catalyst is carried on an alumina support.

Abstract: The present invention provides a gas/liquid contactor module having hollow fiber membranes and a process for controlling dissolved gases in liquids such as water, beer and the like, by passing the liquid through the shell side of the contactor module to allow addition or removal of dissolved gases by the diffusion of the gases through the membranes into or from the hollow fiber bores. The process permits control of the quantity of such dissolved gases as carbon dioxide and nitrogen.

Abstract: A method for preparing a polyurethane foam which comprises reacting an organic polyisocyanate and a polyol in the presence of a blowing agent, a cell stabilizer and a catalyst composition consisting essentially of a compound of structure I ##STR1## wherein R is hydrogen, a C.sub.1 -C.sub.4 alkyl, C.sub.6 -C.sub.8 aryl, or C.sub.7 -C.sub.

Abstract: In an active hydrogen-containing B-side composition for reaction with a polyisocyanate-containing A-side composition to make a polyurethane, polyurethane/urea or polyurea elastomer by reaction injected molding, the improvement which comprises a crosslinking polyol composition which is the reaction product of a C.sub.12 -C.sub.36 fatty acid with a polyalkylene polyamine to yield an intermediate imidazoline-containing polyamine reaction product having at least one C.sub.11 -C.sub.35 alkyl substituent and further reacting the intermediate reaction product with a C.sub.2 -C.sub.21 reactive epoxide.

Abstract: A method for catalyzing the blowing reaction and making polyurethane foams employing a catalyst composition consisting essentially of a hydroxy-functional imidazole of the following formula I ##STR1## where R.sup.1 is a C.sub.1 -C.sub.10 alkyl; R.sup.2 is hydrogen, methyl or ethyl and R.sup.3 is hydrogen or a C.sub.1 -C.sub.20 organic group optionally having an ether functionality, provided that when R.sup.1 is methyl, R.sup.2 and R.sup.3 are not both hydrogen or a hydrogen and a methyl, in combination with a boron compound of the formulaR.sub.n B(OH).sub.3-nwhere n=0 or 1, and R=C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.8 cycloalkyl, or C.sub.6 -C.sub.10 aryl.

Abstract: This invention relates to improved water-based polymeric dispersions having suitability for coatings and other applications which are based upon polymers having a plurality of acetoacetate functional groups and a crosslinkable component comprising a plurality of aromatic aldimine. The basic acetoacetate/benzaldimine containing system comprises an aqueous polymeric dispersion wherein the polymer has a plurality of acetoacetate groups and an effective amount of a curing agent having a plurality of benzaldimine functional groups. The improvement in providing for water-stable polymeric dispersions suitable for coatings and other applications comprises an aqueous dispersion comprising a polymeric component preferably derived from a plurality of polymerizable ethylenically unsaturated monomer units having pendant araldimine or heterocyclic aldimine functionality. Acetoacetate containing monomers generally are used in forming the polymer and a preferred monomer acetoacetoxyethymethacrylate.

Abstract: A new epoxy hardener composition is the product of the reaction of (A) a poly(alkylene oxide) monoalcohol with a molecular weight (Mn) of about 500 to 3000 and (B) a polyepoxide, in a molar ratio of polyepoxide to poly(alkylene oxide) monoalcohol of about 1.3:1 to 6:1 to yield an intermediate (C), which in a second step is reacted with (D) a polyamine. The compositions of the invention are excellent emulsifiers of liquid epoxy resins in aqueous media without the addition of added surfactants or acidic compounds, and can be used to prepare water resistant water-borne coatings and related products from both liquid and solid epoxy resins, that possess long pot lives and contain relatively small amounts of volatile organic compounds.

Abstract: The present invention provides a method and apparatus for the dehydration of gases utilizing hollow fiber membranes. The invention provides an internal sweep of the permeate side of the membranes utilizing an aperture in the tubesheet at the product end of the module thereby sweeping the permeate side of the membrane with product gas.

Abstract: The present invention is directed to improved aqueous dispersions containing polyurethane/vinyl polymers and to a method for making such aqueous polyurethane-vinyl polymer dispersion. The aqueous dispersions comprise a urethane prepolymer having carboxyl functionality therein and a vinyl monomer polymerized therewith. The improvement in these dispersions resides in shelf-stability and self crosslinkability at low temperature with the polyurethanes having the carboxyl functionality in quaternary form and such dispersions containing polymer having pendant epoxide groups. When the aqueous dispersions are cast as a film and the water removed, crosslinking between the carboxyl group and epoxide group occurs.