Abstract: Peroxide-curable fluoroelastomers are prepared in the presence of iodinated compounds, with iodine bonding to a substantial number of terminal positions on the fluoroelastomer, and comprising up to 3 weight percent of bromine-containing units selected from fluoroolefins and perfluoroalkyl perfluorovinyl ethers, and complementally at least 97 weight percent of either units of vinylidene fluoride, one or more fluoroolefins, and optionally perfluoroalkyl perfluorovinyl ethers, or units of tetrafluoroethylene, perfluoroalkyl perfluorovinyl ether, and ethylene. The resulting fluoroelastomers have improved processability, excellent strength and compression set properties, and are useful in the preparation of injection molded shaft seals, gaskets and other molded parts. The fluoroelastomer is prepared by a continuous emulsion polymerization process.

Abstract: Preparation of high yields of tetrafluoroethylene by preferably contacting pentafluoroethane and/or trifluoromethane with hot gas, preferably argon (.gtoreq.2000.degree. K.) followed by rapid cooling of the reaction mixture, in less than one second, i.e., 0.001 to 0.1 second, to a temperature .gtoreq.800.degree. K.

Abstract: Oligormeric polyether/urethanes with semicarbazide end-groups protect spandex fibers from discoloration in atmospheric fumes and/or light. The oligomers are prepared from polyether glycols, diisocyanates and N,N-dialkylhydrazine.

Abstract: In a front-end loader, a lift arm structure including a pair of lift arms which are rigidly joined by an improved cross-piece assembly. The cross-piece assembly includes first and second members which are configured to transversely extend one within the other between the lift arms. Along their lengths, the first and second members are separated from each other such that each is permitted to distort and absorb stress. The end portions of the first member are welded to an outside surface of the respective lift arms which the end portions of the second member are welded to an inside surface of the respective lift arms.

Abstract: Articles made from amorphous dipolymers of perfluoro-2,2-dimethyl-1,3-dioxole with tetrafluoroethylene having high glass transition temperatures of 140.degree. C. or higher, low indices of refraction, and good physical properties, and low dielectric constants, include, among others, substrates for circuit boards, composites, sheets and films, optical lenses, and electronic current carrying devices.

Abstract: A polymer which is useful as a thermoplastic rubbery binder for oxidizer particles, such as HMX and RDX, for the preparation of low vulnerability gun propellants is provided by a segmented thermoplastic copolyester elastomer consisting essentially of a multiplicity of recurring intralinear long chain and short chain ester units connected head-to-tail through ester linkages, said long chain ester units being represented by a structure selected from the following group consisting of: ##STR1## and said short chain ester units being represented by the following structure: ##STR2## wherein: G is a divalent radical remaining after removal of terminal hydroxyl groups from a poly(alkylene oxide) glycol having a carbon-to-oxygen ratio of about 2.0-4.

Abstract: A system for lubricating picker spindles on a cotton harvester. The lubrication system includes a source of pressurized lubricant located on the cotton harvester and which is connected to a lubricant manifold assembly provided at an upper end of each picker rotor of the cotton harvester. The lubricant manifold assembly defines a cavity which receives lubricant through a lower end of the picker rotor. The manifold assembly further defines a series of lubricant passages which direct lubricant from the cavity toward an upper end of each picker bar and, ultimately, to an inner end of each of the picker spindles and the drive mechanisms therefor.

Abstract: A system for the preparation of dot etched lithographic films, consisting essentially of a light sensitive silver halide material for tanning development and an etching solution, in which system the light sensitive material of various layers contains at least one colorant, e.g., pigment or dye with acid groups, which is stable in the processing baths and forms with bases salts soluble in organic solvents, and the etching solution contains a base that ionizes the colorant, and a solvent for the resulting ion pair.

Abstract: A process for the production of esters or lactones, comprising reacting in the presence of a catalyst and under hydrogenation conditions hydrogen and an acyclic or cyclic carboxylic anhydride to produce the corresponding ester or lactone, wherein the catalyst is a supported catalyst comprising:(a) a group VIII metal, Re and Fe;(b) a group VIII metal on TiO.sub.2 ;(c) Ru and at least one of Re, Ag or Cu; or(d) Pd and Fe.Preferably, the anhydride has the formula ##STR1## and is reacted to form an ester of the formula ##STR2## or a lactone of the formula ##STR3## wherein R and R.sup.1 independently are lower alkyl or cycloalkyl; R.sup.2, R.sup.3, R.sup.4, R.sup.5 independently are hydrogen, lower alkyl, cycloalkyl or aryl; and wherein R.sup.3 and R.sup.4 taken together may form a saturated or unsaturated ring, or an aromatic ring. The more preferred starting material is phthalic anhydride.

Abstract: There are disclosed halogenated dioxolanes of a specified formula, dioxoles made therefrom, polymers of the dioxoles, and processes for making the dioxolanes.

Abstract: Chlorofluorohydrocarbons contaminated with unwanted isomers during the process for their manufacture are purified by reacting the mixture with alcohol solutions of alkali metal and then separating the ether derivatives of the isomers from the mixture.

Abstract: There is disclosed apparatus and method for determining molecular weight by osmometry. A fluid circuit is used having two pressure measurement zones, one responsive only to viscosity effects and the other to both viscosity and osmotic effects. The osmotic effects are caused by cross-linked polymeric material within one zone capable of expanding and contracting in response to the presence of a solvent and a solution, respectively, thereby changing the effective radius of the zone and hence the pressure.

Abstract: A process for the preparation of perfluoropolymer by the random interpolymerization of tetrafluoroethylene, perfluoro (alkyl vinyl) ether and bromo curesite reactant, and the improvement wherein the interpolymerization reactants further comprise compounds of the formula RI.sub.n, in which R is a hydrocarbon or halocarbon radical and n is 1 or 2.

Abstract: An improved spandex fiber is provided that is particularly useful for use in tricot-knit fabrics with nylon yarns. The fiber is formed from a polyether-based spandex polymer made from a poly(tetramethylene ether) glycol of about 2,200 molecular weight which was capped with methylene-bis(4-phenylisocyanate) and the resultant product then chain extended with a diamine mixture of ethylene diamine and 2-methyl-1,5-pentanediamine in a molar ratio of about 70/30.

Abstract: Perfluoropolymers prepared from tetrofluoroethylene, perfluro (alkyl vinyl) ether and cyano-cure site monomer, and further comprising iodo moieties, and cured elastomers prepared from the perfluoropolymers.

Abstract: A blend of a tetrafluoroethane or pentafluoroethane refrigerant with a mono-functional random polyalkylene glycol based on significant amounts of ethylene oxide and propylene oxide and having an SUS viscosity at 100.degree. F. of 100 to 1200 is disclosed for use in compression refrigeration.

Abstract: Incorporation into polyacetal molding compositions stabilized with a non-meltable polymer stabilizer of 0.02-1.0 weight percent of at least one amide-containing phenolic antioxidant results in significantly improved long term stability, as evidenced by greater retention of physical properties over time, of such compositions.

Abstract: A chlorinated terpolymer of a precursor terpolymer containing 3-20 weight percent acrylic acid or methacrylic acid, 3-20 weight percent vinyl acetate and 60-90 weight percent ethylene contains 20-60 weight percent chlorine and has a Brookfield viscosity of about 150-600 cP when measured at 25.degree. C. in xylene solution at a concentration of 25% by weight chlorinated terolymer. The chlorinated terpolymer contains 20-60 and preferably 25-55 weight percent chlorine.

Abstract: A device for coagulating a warp of filaments from a linear spinneret by delivering a transparent, jetted sheet of coagulating liquid equally and uniformly along each side of the warp.

Abstract: A ciphering system comprises a ciphering device having an input for a sequence of bits to be ciphered, and output for the ciphered bit sequence, and a mixing unit connected between the input and the output. The mixing unit receives both the bit sequence to be ciphered and a sequence of code bits for ciphering the bit sequence and, by a mixing operation, generates the ciphered bit sequence. The output of the mixing unit is connected to a first code unit for generating code bits. The first code unit comprises a memory addresses with bits from the ciphered bit sequence. The first code unit is furthermore connected to a second code unit, which comprises a memory containing code bits and the output of which is connected to the mixing unit. The deciphering device of the ciphering system is conceived in the same manner as the ciphering device, with the exception that the input of the code unit receives input signals from the input of the deciphering device.