Abstract: Compositions comprising polyalkylene terephthalate, polyethylene and a compatibilizer copolymer of a C.sub.2 -C.sub.10 alpha-olefin and a glycidyl or isocyanate group-containing functional compound, wherein the functional compound comprises about 0.4 to about 50 weight percent of the compatibilizer copolymer, provide improved impact properties and heat resistance. The compositions feature improved compatibility of polyalkylene terephthalate and polyethylene, and are useful in forming a wide variety of articles therefrom.

Abstract: A semipermeable membrane suitable for reverse osmosis applications is prepared by interfacially reacting on a support an aromatic polyamine containing at least three and, preferably, four aromatic nuclei with a polyfunctional amine-reactive compound such as an aromatic polyacyl halide.

Abstract: Processes for using a thin film ultrafiltration membrane for the separation of low molecular weight solutes such as the separation of glucose from sucrose and higher molecular weight sugars and the separation of amino acids from oligopeptides and polypeptides. The membrane possesses desirable properties or characteristics, and may be prepared by casting a solution of a polyelectrolyte complex on a microporous support to form a thin film of polyelectrolyte complex on the surface of the support. The thickness of the membrane will range from about 600 to 3,000 A.

Abstract: Thin film composite ultrafiltration membrane which possesses desirable properties or characteristics may be prepared by casting a solution of a polyelectrolyte complex on a microporous support to form a thin film of the polyelectrolyte complex on the surface of the supports. The thickness of the polyelectrolyte complex membrane will range from about 600 to about 3,000 .ANG.. This membrane may then be used for the separation of low molecular weight solutes such as, for example, the separation of glucose from sucrose and higher molecular weight sugars.

Abstract: Semipermeable membranes comprising polyesters which are resistant to chlorine are prepared by casting on a porous support backing material either a solution comprising a blend of a polymeric hydroxyalkyl acrylate and a polymeric monocarboxylic acid, or a polymeric polycarboxylic acid, or a solution containing a prepolymer which has been formed by the reaction of a polymeric hydroxyalkyl acrylate with an acryloyl halide or an anhydride of a dicarboxylic acid. The porous support backing material is contacted with the solution at contacting conditions, following which the excess solution is removed and the solution-coated porous support backing material is then cured at curing conditions. This membrane will possess excellent characteristics of salt rejection and flux as well as being resistant to the action of chlorine which is present in water which is subjected to a desalination process.

Abstract: Membranes which are used for the separation of gases comprise cellulose acetate membranes which have been crosslinked with an organic titanate. The membranes are prepared by solvent exchanging a cellulose acetate membrane through a series of baths of decreasing polarity followed by treating the membrane with a crosslinking agent comprising an organic titanate in an organic solvent solution which possesses a relatively low polarity. The resulting membranes will retain the original excellent separation characteristics while concomitantly possessing greater temperature and pressure stability and flux characteristics.

Abstract: Ultra-filtration membranes which may be utilized in a separation process such as the separation of monosaccharides and disaccharides from a mixture of mono- di- and higher polysaccharides will comprise an interfacial polymerized condensation product of the reaction between a polymeric amine produced from the reaction of a polyepihalohydrin and a primary amine containing a hydroxy, alkoxy, or carboxylic radical and a compound selected from the group consisting of aromatic polycarboxylic acid chlorides, alicyclic polycarboxylic acid chlorides, aliphatic polycarboxylic acid chlorides, aromatic polycarboxylic anhydrides and aromatic diisocyanates composited on a porous support bacing material.