Abstract: A stabilized chlorinated resin latex comprising a mixture in water of A) 50-95 wt. %, based on the weight of A and B, of a chlorinated resin, substantially free of acid moieties, having a chlorine content of 15-70 wt. %, and B) 5-50 wt. %, based on the weight of A and B, of a salt of a water-insoluble C.sub.2 -C.sub.12 alpha, beta- unsaturated olefin copolymer which contains at least 2 mole % acid moieties and is compatible with the chlorinated resin.

Abstract: A process for curing a heat-weldable roofing membrane by applying elemental sulfur on the exterior surface of the roofing membrane, said membrane being a blend of (a) 50-80% by weight of an ethylene/propylene/nonconjugated diene elastomer and (b) 20-50% by weight of an ethylene-containing polymer selected from the group consisting of polyethylene, an ethylene alpha-monoolefin copolymer wherein the monoolefin contains from 3-12 carbon atoms and is present in amounts of 2-8% by weight, and an ethylene/vinyl acetate copolymer having a vinyl acetate content up to about 10% by weight, said membrane containing a cure accelerator. The roofing membrane is exposed to ambient outdoor temperatures resulting in migration of sulfur to the interior of the membrane where, together with the cure accelerator, it effects cure of the membrane.

Abstract: A curable laminated article, useful for roofing application, comprising at least two layers, each layer comprising a blend of (a) 50-80% by weight of an ethylene/propylene/nonconjugated diene elastomer and (b) 20-50% by weight of an ethylene-containing polymer selected from the group consisting of polyethylene, an ethylene alpha-monoolefin copolymer wherein the monoolefin contains from 3-12 carbon atoms and is present in amounts of 2-8% by weight, and as ethylene/vinyl acetate copolymer having a vinyl acetate content up to about 10% by weight, and wherein each alternate layer contains either elemental sulfur as the crosslinking agent for the elastomer or a cure accelerator so that the elastomer in the laminated article subsequently cures when elemental sulfur and the accelerator in each layer migrate to an adjacent layer when the laminate is exposed to elevated temperatures.

Abstract: An improvement in the process for the continuous copolymerization of ethylene with carbon monoxide and optionally certain polar comonomers having reactive double bonds, wherein a single phase is maintained in the reactor by means of acetone introduced concurrently with the reactants, whereby reactor fouling is significantly reduced or eliminated.

Abstract: An air intake system for a residential combustion furnace is disclosed. The air intake system comprises a membrane formed from an amorphous polymer of perfluoro-2,2-dimethyl-1,3-dioxole, the membrane exhibiting an oxygen/nitrogen selectivity of at least 1.4:1. The permeate section of the membrane is adapted to be in fluid flow communication with a combustion zone of the residential combustion furnace. The membrane preferably has an oxygen flux in excess of 100 Barrers, especially in excess of 500 Barrers. The air intake system provides oxygen-enriched air for the furnace, to make the furnace more efficient.

Abstract: A selectively permeable membrane for the separation or enrichment of gaseous mixtures may be formed from amorphous polymers of perfluoro-2,2-dimethyl-1,3-dioxole, especially copolymers with a complementary amount of at least one of tetrafluoroethylene, perfluoromethyl vinyl ether, vinylidene fluoride and chlorotrifluoroethylene. Preferably, the polymer is a dipolymer containing 65-99 mole % of perfluoro-2,2-dimethyl-1,3-dioxole and having a glass transition temperature of at least 140.degree. C. The membranes may be used for the separation or enrichment of a wide variety of gaseous mixtures, including oxygen enrichment of air, and separation or enrichment of gaseous organic compounds in admixture with air, including separation or enrichment of the amount of fluorocarbon gases in air. The membranes exhibit a very high flux rate, compared with other glassy organic polymer membranes.

Abstract: An air intake system for a mobile combustion engine is disclosed. The air intake system comprises a membrane formed from an amorphous polymer of perfluoro-2,2-dimethyl-1,3-dioxole, the membrane exhibitign an oxygen/nitrogen selectivity of at least 1.4:1. The permeate section of the membrane is adapted to be in fluid flow communication with a combustion zone of the mobile combustion engine. The membrane preferably has an oxygen flux in excess of 100 Barrers, esepcially in excess of 500 Barrers. The air intake system provides oxygen-enriched air for the engine, to make the engine more efficient.

Abstract: A process for improving the permselectivity of an aromatic polyimide gas separation membrane comprising contacting the membrane with a solution of a surfactant in a solvent which swells the membrane but in which the membrane material is soluble to an extent of no more than 3% under the conditions used to contact the membrane.

Abstract: A process for improving the permselectivity of asymmetric polyaramide gas separation membranes is disclosed. The process involves contacting the membrane with a dilute solution of a surfactant in a solvent which preferably swells the membrane material. The surfactants are anionic, nonionic or amphoteric with the fluorinated nonionic surfactants being preferred.

Abstract: A permselective polyimide membrane having phenylindane residues incorporated into the polyimide backbone chain exhibiting high selectivity while maintaining good gas permeation rates and a process for using.

Abstract: A permeable membrane apparatus having one or more hollow-fiber bundles enclosed in a single housing with end caps adapted so as to segment the bundles into a plurality of portions that can be separately used for fluid separation and its use.

Abstract: A coated cation exchanged fabric having as its base a fluorinated cation exchange resin, oriented at least 1x, in alkali metal salt form and as its coating an unoriented or oriented melt-fabricable precursor of the same salt-form fluorinated cation exchange resin. The invention also includes various processes for making the coated fabric.

Abstract: A fluorinated cation exchange membrane made using reinforcement of oriented, hydrolyzed fabric of a cation exchange copolymer, the fabric having a coating of a melt-processible precursor or derivative of a fluorinated cation exchange resin on at least one surface or throughout.

Abstract: A sheath/core yarn having as its core a fluorinated cation exchange resin, oriented at least 1x, in alkali metal salt form and as its sheath an unoriented or oriented melt-fabricable precursor or derivative of the same salt-form fluorinated cation exchange resin. The invention also includes various processes for making the sheath/core yarn.

Abstract: An improved process is disclosed for killing and inhibiting growth and reproduction (aftergrowth) of microorganisms comprising adding sufficient chloramine to kill the microorganisms without oxidizing high molecular weight organics, which are not easily assimilated by organisms that survive, into lower molecular weight ones, which are easily assimilated.

Abstract: A process of producing a polyimide gas separation membranes comprising adding an oligomeric or polymeric aromatic epoxy resin to the dope solution, the resin being soluble in the polyimide or polyamic acid precursor, the solvent and the final membrane and the membrane comprising a blend of the polyimide and the resin.

Abstract: A fluorinated cation exchange membrane comprising one or more layers of an ion-conductive film and where one or more layers has adhered therein a fabric reinforcement made from fully ion conductive yarn that is oriented and then at least partially hydrolyzed, the film and the yarns being made of melt-fabricable fluorinated cation exchange resin precursors having a mole ratio of non-functional to functional monomer of 2.8-11.8:1, the mole ratio in the film adjacent to the fabric being different from that of the fabric by no more than three units, where the membrane is employed in the process of electrolyzing alkali metal halides.

Abstract: A membrane process for producing an improved product quality comprising feeding a clarified serum at an elevated pressure to a plurality of reverse osmosis units in two stages--the first having high-rejection polyamide membranes and the second having low-rejection membranes, wherein the permeate from the low-rejection membranes is recycled to the high-rejection feed.

Abstract: An improved process for delignifying and bleaching nonwoody, lignocellulosic material into products digestible by ruminants and ingestible by humans. The process comprises treating the substrate in an alkaline solution for a period of time and adding magnesium ions prior to adding peroxide or, alternatively, adding the magnesium to the peroxide prior to adding the peroxide to the alkaline slurry.

Abstract: An improved process of purifying the product from an alkaline peroxide treatment process for delignifying and bleaching nonwoody lignocellulosic agricultural residues comprising, optionally washing with water, then lowering and maintaining the pH of the substrate at less than about pH 3.0, then washing sufficiently to remove residual chemicals, separating the product from the wash liquid and, optionally, drying the product.