Abstract: This invention relates to a new process for preparing a copolyamide comprising polymerizing an alpha, beta-unsaturated nitrile and water with a molar excess of a lactam. In one embodiment, acrylonitrile, water and caprolactam are polymerized to form a nylon-3,6.

Abstract: Molded fiber-reinforced thermoplastic articles are prepared by a novel two-step process involving an in situ polymerization of monomers onto the fiber followed by compression molding of the product.

Abstract: The physical properties of a nitrile barrier resin, particularly the tensile modulus, heat distortion temperature and processability, are improved by including therein a carboxylic acid processing aid and an alkaline filler material.

Abstract: This invention relates to a supported catalyst and to the use of this catalyst in a process for the polymerization of alpha-olefins. The catalyst comprises a transition metal complex supported on an interpolymer comprising an alpha, beta-unsaturated dicarboxylic acid, anhydride or lower alkyl ester thereof, and one or more monomers copolymerizable therewith which has been treated with a Group IIA halide or alkyl halide. Preferred supports comprise maleic anhydride copolymers which have been treated with a magnesium compound.

Abstract: Moldable polyolefin compositions exhibiting improved heat distortion and modulus characteristics, and a method of preparing such compositions are described. The method of preparing these polyolefin compositions comprises reacting(a) a graft-modified polyolefin obtained by reacting a polyolefin with an unsaturated polycarboxylic acid, ester or anhydride which is graft-polymerizable therewith, and(b) at least one organic hydroxy compound. These polyolefin compositions can be reinforced with fibers, minerals and fillers for particular applications.

Abstract: This invention describes a process for preparing amides comprising contacting a nitrile, amine and water in the presence of a carbon dioxide catalyst. In one embodiment, nylon-6,6 is prepared by contacting adiponitrile, hexamethylene diamine and water in the presence of carbon dioxide.

Abstract: Nitrile barrier resin latexes containing a coalescing agent which (1) is a solvent for the nitrile barrier resin, (2) has a boiling point between 100.degree. and 300.degree. C., and (3) does not azeotrope with water are excellent oxygen barriers and have good chemical resistance when coated on various substrates. Especially effective coalescing agents are selected from the group consisting of dimethyl formamide, dimethyl acetimide, methyl pyrrolidone, dimethyl sulfoxide, glycol carbonate and tetramethylene sulfone.

Abstract: An acoustic surface wave device is disclosed for generating an output signal that is the phase-conjugate of the input signal to the device. Disposed on the piezoelectric substrate is a first interdigital transducer for receiving a modulated input signal having a carrier center frequency f.sub.1 and for converting the input signal to an input acoustic wave. A semiconductor material is disposed over the surface of the piezoelectric substrate. A second interdigital transducer is disposed on the surface of the piezoelectric substrate between the first interdigital transducer and the semiconductor material. A standing wave at frequency f.sub.1 is generated by counterpropagating pump waves in the nonlinear acoustic wave interaction region in the area of the semiconductor material.

Abstract: A process for forming sintered porous polymeric articles by the steps of sintering preforms of polymeric particles with dielectric heat, or with dielectric heat in combination with conventional heating techniques. Sintered porous polymeric articles made of rubber-modified nitrile resins in accordance with the foregoing processes are also disclosed.

Abstract: It has been discovered that nitrile barrier resin latexes containing a polyvinyl pyrrolidone compound are especially effective for coating various substrates.

Abstract: A synthetic resin laminated structure is produced by bonding together in a molten state a layer of a (I) nitrile barrier resin, (II) a layer of a polymer mixture comprising a nitrile barrier resin and a halogenated polyolefin, and (III) a layer of a thermoplastic resin. The thermoplastic resins useful in this invention include polyolefins such as polyethylene and polypropylene, polyvinylchlorides, styrene containing polymers such as ABS, SAN and polystyrene, polycarbonates, polyurethanes, polysulfones, polyamides and nitrile barrier resins.

Abstract: The invention herein is directed toward a method for forming a coating on the surface of a catalyst and includes the steps of dissolving a membrane forming compound in a hdyrocarbon solvent, adding the catalyst to the solvent and agitating to form a mixture and finally drying the mixture to form particles of the catalyst having a coating of the membrane forming compound. Particularly suitable for the polymerization of monoolefins are Ziegler-Natta catalyts which can be coated according to the foregoing method. The compounds forming the coating include the silicone greases obtained by mixing a filler material with a dimethylpolysiloxane fluid.

Abstract: Physical properties particularly including tensile modulus and heat-distortion temperature of high nitrile copolymer resins are improved by including therein a processing aid, such as tetra chloro phthalic anhydride, and a filler material, such as clay.

Abstract: A method of precipitating a copolymer comprising maleic anhydride from a solution comprising an organic solvent, the method comprising mixing a solution of an organic solvent and a copolymer of maleic anhydride and a monomer copolymerizable therewith with hot water and agitating the resulting mixture for a sufficient period of time and at a sufficiently high shear rate to yield precipitated particles of said copolymer that are substantially free of internal organic solvent.

Abstract: The inclusion of a small amount of an ester-type plasticizer in the rubber polymerization recipe in the production of rubber-modified high nitrile copolymer resins produces resins having markedly improved impact resistance at both low and high temperatures.

Abstract: Polymeric compositions having high softening temperatures, good gas barrier properties and low creep properties are composed of an olefinically unsaturated nitrile, another monovinyl component and maleic anhydride and optionally a diene monomer.

Abstract: Polymeric compositions having high softening temperatures, good gas barrier properties and low creep properties are composed of an olefinically unsaturated nitrile, another monovinyl component and maleic anhydride and optionally a diene monomer.

Abstract: Metal surfaces such as steel, tin-plated steel, and aluminum are coated and protected from corrosion by means of a coating comprising a latex of a high nitrile polymer.

Abstract: High nitrile copolymers are rendered impact resistant by inclusion therein of small amounts of epoxidized vegetable oils.

Abstract: Certain physical properties, such as heat-distortion temperature and flexural modulus, of certain commercially available thermoplastic resins are improved by blending with polyindene or coumarone-indene resins.