Abstract: This invention relates to a solvent system and process for cleaning cellulose triacetate polymer camera film. The solvent system comprises n-propyl bromide and an alkane containing 6 to 7 carbon atoms.

Abstract: This invention relates to non-stabilized or at least only lightly stabilized n-propyl bromide-based solvent systems which are suitable for use in the presence of metals which normally and easily catalyze the dehydrobromination of brominated hydrocarbons, such as isopropyl bromide.

Abstract: Low density, heat stabilized, flame retardant styrenic polymer foam compositions include a halogen-based flame retardant such as hexabromocyclododecane and zeolite A heat stabilizer.

Abstract: This invention relates to compositions containing improved granulated hexabromocyclododecane flame retardant products, flame retardant formulations containing products, and to a process for forming the improved granulated flame retardant products, wherein the granulated product is characterized as having a friability loss of less than about 8 percent.

Abstract: This invention relates to a method for obtaining [S,S] ethylenediamine-N,N'-disuccinic acid precipitate from an aqueous solution of the salts of such acid and L-aspartic acid.

Abstract: This invention relates to a process for selectively producing and recovering [S,S]-ethylenediamine-N,N'-disuccinic acid by the reaction of L-aspartic acid and 1,2-dihaloethane in an aqueous medium, wherein a stoichiometric deficiency of 1,2-dihaloethane is used and wherein the resultant aqueous solution obtained from the reaction is co-fed to water with a mineral acid to preferentially precipitate out [S,S]-ethylenediamine-N,N'-disuccinic acid from the solution.

Abstract: This invention relates to a process for the production of a solid calcium [S,S]-ethylenediamine-N,N'-disuccinate by the reaction of calcium aspartate and dihaloethane in an aqueous solvent.

Abstract: Bromochloro-alkanes are made by reaction of a corresponding chloroalkene with hydrogen bromide by a continuous process carried at -20.degree. to +20.degree. C., preferably in a gas-lift reactor.

Abstract: This invention relates to a method for converting calcium salts of [S,S]-ethylenediamine-N,N'-disuccinic acid to an easily filterable precipitate of [S,S]-ethylenediamine-N,N'-disuccinic acid.

Abstract: This invention relates to an improved process for the thermal dehydrogenation of polysilicon granules in a fluidized bed reactor, the improvement which comprises introducing a varying electromagnetic field into the reactor whereby reactor walls are coated with silicon during the dehydrogenation.

Abstract: This invention provides an environmentally acceptable method for recovery of phenolic and brominated phenolic compounds, alcohol solvent, and bromide values from the a reaction medium liquid mixture formed in the production of a tetrabromobisphenol-A predominant product. The process comprises (a) separating the tetrabromobisphenol-A predominant product and alkyl bromide from the reaction medium thereby forming a liquid mixture containing alcohol, phenolic and brominated phenolic compounds, HBr, and water; (b) treating the liquid mixture with a sufficient amount of alkaline or alkaline earth metal hydroxide so as to form a treated aqueous mixture having a pH in the range of from about 9.5 to about 14.0, and containing MBr.sub.

Abstract: The impact strength of articles made from a flame-retarded formulated HIPS resin containing an impact modifier is increased by forming a concentrate or masterbatch containing the flame retardant and impact modifier, blending the concentrate with HIPS resin, and extruding the resultant blend.

Abstract: A continuous process for the extraction of halogenated hydrocarbons from a dilute, halogenated hydrocarbon-containing aqueous fluid, in high efficiency, while dramatically reducing the stripping medium requirement for the extraction and without substantially increasing the amount of halogenated hydrocarbons discharged to the atmosphere.

Abstract: This invention relates to a process and apparatus for repairing a port of a vessel, the port having an inside surface which is damaged. The method and apparatus utilize a liner means for lining the inner surface of the port, a sealed chamber between the lining means and the inner surface of the vessel port, a means of using a gas, preferably an inert gas, to purge the sealed chamber, and a means of monitoring the gas which is purged from the chamber.

Abstract: Disclosed herein is an apparatus and process for determining the vapor pressure of materials in a mixture at relatively low vapor pressures by a gas saturation procedure. The process comprises passing an inert gas over a sampled material at a controlled flow rate to create a vapor of the sampled materials that may be collected and analyzed. Of particular importance, this method and apparatus provides a means of collecting vaporized samples over an extended period of time and, therefore, allows even minor components of mixtures to be considered in the final vapor pressure analysis. The apparatus also includes a means for determining whether sampled material has progressed as vapor beyond the means of collecting the sampled material.

Abstract: The hydrogen content of polysilicon can be reduced by heat treatment. The process is preferably conducted on polysilicon particles in bead-like form produced by chemical vapor deposition in a fluidized bed. The heat treatment is preferably conducted at a temperature of 1020.degree.-1200.degree. C. for a time from about 6 hours to about 1 hour sufficient to reduce the hydrogen content, and insufficient to cause agglomeration of the particles being treated. In order to reduce the tendency of particles to agglomerate at the process temperature employed, the particle bed is preferably maintained in motion during the dehydrogenation. The products produced by the process can have a hydrogen content of 30 ppma or less. These improved products can be used to produce monocrystalline silicon for the production of semiconductor devices.

Abstract: The hydrogen content of polysilicon can be reduced by heat treatment. The process is preferably conducted on polysilicon particles in bead-like form produced by chemical vapor deposition in a fluidized bed. The heat treatment is preferably conducted at a temperature of 1020.degree.-1200.degree. C. for a time from about 6 hours to about 1 hour sufficient to reduce the hydrogen content, and insufficient to cause agglomeration of the particles being treated. In order to reduce the tendency of particles to agglomerate at the process temperature employed, the particle bed is preferably maintained in motion during the dehydrogenation. The products produced by the process can have a hydrogen content of 30 ppma or less. These improved products can be used to produce monocrystalline silicon for the production of semiconductor devices.

Abstract: The impact strength of a flame retarded formulated ABS resin containing an impact modifier is increased by masterbatching the flame retardant and impact modifier.

Abstract: This invention relates to a process for increasing the melting point of partially brominated diphenyl oxide mixtures having an average bromine content of 7.0 to 8.5. The process comprises: forming a slurry comprised of alkyl halide and the mixture; and evaporating essentially all of the allyl halide from the slurry.

Abstract: This invention relates to a process for preparing and treating a product predominant in N,N'-bis(tetrabromophthalimide) so as to produce a bisimide product which has enhanced suitability for use in thermoplastic formulations as a result of reduction in volatile impurities and particle size.