Abstract: A thermosetting resin is comprised of (a) a bisimide, particularly a bismaleimide, (b) a polyphenol, particularly a bisphenol, and (c) dicyandiamide. The polyphenol may be styrene-terminated (i.e. a vinyl benzyl ether of a bisphenol). Flame retardance is improved by the addition of octabromodiphenyl oxide.

Abstract: Novel azeotrope-like compositions comprising 1,2-difluoroethane and dichlorotrifuoroethane which are useful in a variety of industrial applications including refrigerant applications, solvent applications, and blowing agent applications.

Abstract: Azeotrope-like compositions consisting essentially of 1,1-dichloro-1,2,2-trifluoropropane and alkanol having 1 to 4 carbon atoms are stable and have utility as degreasing agents and as solvents in a variety of industrial cleaning applications including cold cleaning and defluxing of printed circuit boards.

Abstract: The present invention provides a novel lubricating composition comprising a polyoxyalkylene glycol having a cap of a fluorinated alkyl group on at least one end thereof. The composition has a molecular weight between 300 and 3,000, a viscosity of about 5 to about 150 centistokes at 37.degree. C., and a viscosity index of at least 20. The composition is miscible in combination with tetrafluoroethane in the range between -40.degree. C. and at least +20.degree. C.The novel lubricating composition is particularly useful with tetrafluoroethane in refrigeration and air-conditioning applications. As such, the present invention also provides a composition for use in refrigeration and air-conditioning comprising: (a) tetrafluoroethane; and (b) a sufficient amount to provide lubrication of at least one polyoxyalkylene glycol having a cap of fluorinated alkyl group on at least one end thereof. The lubricant has a molecular weight of about 300 to about 3,000, a viscosity of about 5 to about 150 centistokes at 37.degree.

Abstract: The present invention relates to a process for the preparation of hydroxypyridine based compounds. The process comprises the step of: in water, reacting a pyridine based compound with the proviso that the second position on the nitrogen ring is unsubstituted and the fourth position in the nitrogen ring is not substituted with halogen, with elemental fluorine at a temperature of about -25.degree. to about +30.degree. C. for a time sufficient to form a 2-hydroxypyridine based compound.The resulting 2-hydroxypyridine or quinoline carboxylic acids and esters are useful as herbicide and pharmaceutical intermediates.

Abstract: Azeotrope-like compositions comprising 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane, and nitromethane are stable and have utility as solvents in a variety of industrial cleaning applications including cold cleaning and defluxing of printed circuit boards.

Abstract: Apparatus for removing solvent vapor from a process air stream including at least first and second tanks each containing a carbon bed and alternately connected to a solvent laden air inlet duct and an outlet duct for respectively directing the solvent laden process air into desorbing contact with the carbon bed while providing an exit flow path for the treated process air stream to be discharged from the tank. When the carbon bed is saturated with adsorbed solvent, the inlet and outlet ducts close and are switched to supply solvent laden process air to the other tank to achieve continuous processing of the air stream. The saturated tank is provided with steam which flows through the carbon to desorb solvent. The desorbed solvent laden steam enters a condenser where the steam and solvent vapor are condensed and drained to a separator through a bottom outlet in the condenser.

Abstract: Azeotrope-like compositions comprising 1,1,2-trichloro-1,2,2-trifluoroethane; 1,2-dichloroethylene; and alkanol having 3 to 7 carbon atoms have utility as degreasing agents and as solvents in a variety of industrial cleaning applications including cold cleaning and defluxing a printed circuit boards.

Abstract: The present invention provides a process for the purification of 1,1-dichloro-1-fluoroethane comprising the steps of: (a) reacting anhydrous hydrogen fluoride with 1,1,1-trichloroethane or vinylidene chloride containing dichloroacetylene to form 1,1-dichloro-1-fluoroethane; and (b) passing the 1,1-dichloro-1-fluoroethane through activated carbon to substantially remove unsaturated impurities. In particular, the present process reduces the amounts of dichloroacetylene and vinylidene chloride in the 1,1-dichloro-1-fluoroethane product so as to meet the current specifications set forth by the Panel for Advancement of Fluorocarbon Test.The purified 1,1-dichloro-1-fluoroethane product is useful as a blowing agent and a solvent.

Abstract: Azeotrope-like compositions of penetafluorodimethyl ether and monochlorodifluoromethane useful for heating and cooling applications.

Abstract: A method of cleaning a surface of a substrate is provided. The method comprises treating the surface with a solvent comprising a compound of the formulaCH.sub.a Cl.sub.b F.sub.c (CF.sub.2).sub.d CH.sub.e Cl.sub.f F.sub.gwherein a+e ranges from 1 to 4, b+f equals 2, c+g ranges from 0 to 3, d is from 1 to 4, a+b+c=3, and e+f+g-3.

Abstract: Azeotrope-like compositions comprising pentafluoroethane; 1,1,1-trifluoroethane; and chlorodifluoromethane are stable and have utility as refrigerants for heating and cooling.

Abstract: The present invention provides a process for recovering boron trifluoride from an impure gaseous boron trifluoride residue. The process comprises: (a) feeding an impure gaseous boron trifluoride residue containing sulfur dioxide as an impurity into a mixture of boric and sulfuric acids wherein the acid mixture absorbs boron trifluoride from the impure boron trifluoride residue and slightly absorbs or does not absorb sulfur dioxide from the impure gaseous boron trifluoride residue; and (b) removing the unabsorbed sulfur dioxide from the acid mixture.The present invention also provides a boron trifluoride preparation and purification process.

Abstract: Vinylidene chloride can be substantially removed from a stream of CFC-141b over a carbon molecular sieve having a mean pore size of about 4.2 to 4.5 Angstroms.

Abstract: Dichloroacetylene can be substantially removed from a stream of CFC-141b and/or vinylidene chloride over a carbon molecular sieve having a mean pore size of about 4.2 to 4.5 Angstroms.

Abstract: The present invention provides a process for the preparation of luorinated alkanes. The process comprises the step of: reacting an alkene with carbon having fluorine absorbed therein at a temperature and for a time sufficient to form fluorinated alkanes. The alkene used is not perhalogenated at the double-bonded carbons. Preferably, the alkene used is vinylidene fluoride or ethylene.The process produces products such as 1,1,1,2-tetrafluoroethane (known in the art as 134a) which may be used as a refrigerant and 1,1,1-trifluoroethane (known in the art as R143a) and 1,2-difluoroethane (known in the art as R152) which may be used as blowing agents or solvents.

Abstract: The present invention provides a novel compound represented as ##STR1## The present novel compound is prepared by reacting fluorine with pyridine-boron trifluoride and is useful as a fluorinating agent in the fluorination of organic compounds.

Abstract: A process for manufacturing high purity anhydrous hydrogen fluoride (HF) having low levels of arsenic impurity by contacting anhydrous hydrogen fluoride product, or an intermediate product obtained during the manufacture of HF, with hydrogen peroxide to oxidize the arsenic impurity in the presence of a catalyst which comprises a catalytic amount of a component selected from the group consisting of molybdenum, a molybdenum compound, vanadium, and a vanadium compound, and a phosphate compound. The volatile trivalent arsenic impurity in the anhydrous hydrogen fluoride is oxidized to a non-volatile pentavalent arsenic compound and the resultant mixture is distilled to recover high purity anhydrous hydrogen fluoride with reduced levels of arsenic impurity. In one embodiment, an oxidizing agent such as nitric acid or a nitrate salt is added to the reaction mixture to oxidize organic compounds.

Abstract: A process for preparing an aromatic aldoxime, such as benzaldehyde oxime, by reacting the corresponding, .alpha.,.alpha.-dihalide, such as benzal chloride, with a hydroxylamine salt in the presence of an excess of an aqueous base sufficient to maintain the product oxime in solution. Organic impurities may be phase separated from the reaction mixture. Thereafter, the aqueous solution containing product oxime is neutralized to separate an oxime phase, which may be recovered by decanting or solvent extraction.

Abstract: Industrial grade chloroform is purified to remove traces of cis-1,2-dichloroethylene, bromochloromethane, and amylenes by a two-step process. The chloroform is first treated by contacting with aqueous sulfuric acid to remove amylenes and thereafter passed over a zeolite having an average pore size of 3 to 6 Angstroms and a Si/Al atomic ratio in the range of about 1.6/1 to 3/1, preferably calcium chabazite, to remove cis-1,2-dichloroethylene and bromochloromethane.