Abstract: Disclosed is a tape which comprises a non-tacky, free-standing, 90 to 100% imidized polyimide film containing 0.1 to 30 wt % of a solvent having a releasable film adhering to at least one side. The film is used to form coatings on substrate or as an adhesive to bond substrates together.

Abstract: Disclosed is a resin paste made from a maleimide having at least two maleimide groups and a liquid diamine. The paste can optionally contain fillers, thickeners, defoamers, coupling agents, and solid epoxies. The resin paste has a long pot life and a short cure time and is dispensable through a syringe.

Abstract: Disclosed is a cleaning composition of about 80 to about 99 wt % benzotrifluoride, about 1 to about 20 wt % monohydric alkanol from C.sub.1 to C.sub.4, and up to about 20 wt % of a fluorocarbon having the general formula C.sub.m H.sub.n F.sub.2m+2n, where m is 4 to 8 and n is 1 to m/2 if m is even and (m+1)/2 if m is odd. The composition is useful in cleaning greases, oils, solder fluxes, and other soils.

Abstract: Disclosed is a method of chlorinating a side chain of a aromatic or heterocyclic ether. The aromatic or heterocyclic ether is mixed with a fluorine-containing aliphatic solvent. The aromatic or heterocyclic ether is contacted with chlorine radical at an elevated temperature which results in its chlorination. The chlorinated product is preferably insoluble in the solvent and separates, forming two phases. The solvent phase can be recycled and reused.

Abstract: Novel benzothioxepanone and benzothioxepane thione compounds are characterized by the formula ##STR1## wherein Z is: ##STR2## R is Cl, Br, F, C.sub.1 to C.sub.8 alkyl, or C.sub.1 to C.sub.8 alkoxy; X and Y are each hydrogen, or taken together form a fused cyclopentyl or cyclohexyl ring, with the proviso that when Z is ?1!, X and Y represent a fused cyclopentyl or cyclohexyl ring; and n is 0, 1, or 2. The compounds are useful as co-catalysts in the para-directed nuclear chlorination of toluene.

Abstract: Disclosed is a method of making trichloromethoxybenzene. A mixture is prepared of anisole and a source of chlorine free radicals, such as chlorine or sulfuryl chloride. The reaction is performed in a solvent, which can be either benzotrifluoride, orthochlorobenzotrifluoride, metachlorobenzotrifluoride, parachlorobenzotrifluoride, or dichlorobenzotrifluoride. The mixture is exposed to actinic radiation, such as ultraviolet light, which generates the chlorine free radicals.

Abstract: Disclosed is a method of making chlorinated hydrocarbons. A mixture is prepared of a hydrocarbon or partially chlorinated hydrocarbon from C.sub.18 to C.sub.30 and either benzotrifluoride or parachlorobenzotrifluoride in an amount sufficient to liquefy the mixture at the chlorination temperature. The mixture is heated to a temperature of about 50.degree. to 100.degree. C. and sufficient chlorine gas is passed therethrough in the presence of UV light to form a chlorinated hydrocarbon that is about 60 to about 80 wt. % chlorine. One part by weight of the composition is added to at least two parts by weight per part of a C.sub.1 to C.sub.6 monohydric alcohol, which results in the precipitation of the chlorinated hydrocarbon. The precipitated chlorinated hydrocarbon can be removed from the composition by, for example, filtration.

Abstract: Disclosed is a method of reducing the UV absorption of a solvent that comprises water, an ethylene glycol, or a mixture thereof, where the solvent contains at least 0.1 ppm of a dione, particularly 3-methyl-2-hydroxy cyclopent-2-eneone or its tautomer, 3-methyl-1, 2-cyclopentanedione. The solvent is passed through an anionic exchange resin containing strong base sites. The UV absorbance of the effluent from the anionic exchange resin can be monitored and, when it increases, the resin can be reactivated by passing an aqueous solution of a base through it.

Abstract: Disclosed is a method of making an aromatic nitrile by reacting a benzotrichloride having the formula ##STR1## with a source of ammonia, where Z is R, X, ##STR2## --ROR, or --OR, R is alkyl from C.sub.1 to C.sub.20 or aryl from C.sub.1 to C.sub.25, X is halogen and n is 0 to 5. The reaction is performed in the presence of 0.01 to about 5 wt % of a catalyst having the general formula M.sub.P/2 O or MX.sub.p .cndot.mH.sub.2 O and about 0.01 to about 5 wt % water, as free water or water of hydration, based on the weight of the benzotrichloride, where M is beryllium, magnesium, calcium, strontium, or barium, m is 0 to 6, and p is the valence of M.

Abstract: A cleaning solvent comprising(A) about 3 to about 20 wt % of a fluorinated compound selected from the group consisting of(1) fluorocarbons having the general formulaC.sub.m H.sub.n F.sub.2m+2-nwhere m is 4 to 8, and n is 0 to m/2 if m is even and 0 to (m+1)/2 if m is odd;(2) C.sub.5 F.sub.11 NO;(3) alkyl perfluoroethers having the general formulaR.sub.1 OR.sub.2where R.sub.1 is C.sub.3 F.sub.7 or C.sub.4 F.sub.9 and R.sub.2 is CH.sub.3 or C.sub.2 H.sub.5 ; and(4) fluorochlorocarbons having the general formulaC.sub.p H.sub.q Cl.sub.r F.sub.2p+2-q-rwhere p is 3, 4, or 5, q is 1 to p-1, and r is 1 to p-1;(B) up to about 15 wt % of a C.sub.1 to C.sub.4 alkanol; and(C) the remainder benzotrifluoride.

Abstract: Disclosed is a method of making m-chlorobenzotrifluoride. Benzotrifluoride is reacted with chlorine gas in the presence of about 0.1 to about 5 mole % (based on benzotrifluoride) of a metal chloride which can be FeCl.sub.3, SbCl.sub.3, or AlCl.sub.3 and about 0.025 to about 5.0 mole % (based on benzotrifluoride) of a catalyst having the formula ##STR1## where Z is halogen, alkyl from C.sub.1 to C.sub.6, alkoxy from C.sub.1 to C.sub.6, or fluoroalkyl from C.sub.1 to C.sub.6, n is 0 to 5, and the molar ratio of metal chloride to cocatalyst is about 0.5 to about 4.

Abstract: Disclosed is a single phase liquid composition comprising 0.5 to 30 wt % of a benzotrifluoride solvent, about 0.5 to about 50 wt % of a glycol ether cosolvent, up to about 50 wt % of an alkanol, up to about 10 wt % of a surfactant, and the remainder water. The composition is effective in cleaning hard surfaces, stripping paint, and as a carrier.

Abstract: A process for the pare-directed nuclear chlorination of an alkylbenzene, such as toluene, comprises reacting the alkylbenzene with chlorine in the presence of a Lewis acid catalyst and a novel co-catalyst of the formula: ##STR1## where Z is ##STR2## and R is Cl, Br, F, C.sub.1 to C.sub.8 alkyl to C.sub.1 to C.sub.8 alkoxy; x and y are each hydrogen, or taken together form a fused cyclopentyl or cyclohexyl ring; n is 0, 1 or 2, with the proviso that when Z is ?3!, n is 0 or 1.

Abstract: Disclosed is a method of making a chlorobenzene having the general formulas ##STR1## where X is Cl or F, and X' is X or CF.sub.3. A compound having the formula ##STR2## is sulfonated using at least 2 moles per mole of said compound of a sulfonating agent selected from the group consisting of sulfuric acid, chlorosulfonic acid, and mixtures thereof, to produce a sulfonated compound. The sulfonated compound is chlorodesulfonated to produce a chlorobenzene, such as 1,2,4-trichlorobenzene. Preferably, the starting material is ortho-dichlorobenzene.

Abstract: The present invention provides an efficient process for the production of ethylene or a mixture of ethylene and vinyl chloride, in which some 1,2-dichloroethane (EDC) may also be produced, by reacting chlorine with ethane. The process is characterized by a conversion of ethane per pass through the reactor of at least about 50%, and a combined molar yield of ethylene and vinyl chloride of at least about 80% based on the ethane consumed. In accordance with this invention, there is provided a process for preparing ethylene or a mixture of ethylene and vinyl chloride by the reaction of ethane and chlorine which comprises:(a) providing a stream of ethane feed gas and a stream of chlorine feed gas;(b) preheating either said ethane stream only or both said ethane and chlorine streams;(c) thoroughly mixing said ethane and chlorine feed gases within about one second and at a molar ratio of ethane to chlorine of at least about 0.9:1.

Abstract: Disclosed is a water stable tablet for disinfecting recirculating water systems comprising chlorinated isocyanurate, sodium bromide and a stabilizer which regulates the rate at the chlorinated isocyanurate and the sodium bromide are dissolved or dispersed in flowing water. The stabilizer may be an active chlorine stabilizer compound that is compatible with chlorinated isocyanurates in the solid state, capable of binding active halogen (chlorine or bromine in the +1 valence state), and less soluble when fully chlorinated than in the less than chlorinated state.

Abstract: Disclosed is a method of reducing the corrosion of a carbon steel reboiler in which a reboiler fluid containing nitrogen trichloride is heated to decompose the nitrogen trichloride. About 1 to about 100 ppm, based on the reboiler fluid weight, of a source of iodine, is added to the reboiler.

Abstract: Disclosed is a method of selecting a gas oil feedstock for use in manufacturing olefins. The feedstock is analyzed for the presence of benzothiophenes and is used to manufacture olefins only if it contains less than 50 ppm (as sulfur) of benzothiophenes. The concentration of benzothiophenes can be reduced by distilling the feedstock and removing the fraction of the feedstock that boils between about 45.degree. and about 60.degree. C. under reduced pressure of about 0.05 to about 0.1 mmHg. The concentration of benzothiophenes can also be reduced by passing the feedstock through a benzothiophene adsorber such as activated alumina or activated carbon.

Abstract: Disclosed is a method of making 3,5-diaminobenzotrifluoride from 4-chloro-3,5-dinitrobenzotrifluoride. A solution of 4-chloro-3,5-dinitrobenzotrifluoride in an alcohol is prepared. Separately, a slurry is prepared of a palladium catalyst on a suitable substrate, at least one equivalent of magnesium oxide per equivalent of 4-chloro-3,5-dinitrobenzotrifluoride, sufficient hydrogen-donating reducing agent to reduce the 4-chloro-3,5-dinitrobenzotrifluoride to 3,5-diaminobenzotrifluoride, and an amount of alcohol sufficient to make the slurry stirrable. The solution is added to the slurry with stirring at a rate that does not exceed the reaction rate of the 4-chloro-3,5-dinitrobenzotrifluoride so that no unreacted 4-chloro-3,5-dinitrobenzotrifluoride accumulates in the slurry. The reaction mixture is heated at about 75.degree. to about 100.degree. C.

Abstract: Disclosed is a method of determining a diffusion coefficient for a diffusant in a particulate. An inert gas is passed through a particulate containing the diffusant. A parameter that is proportional to the concentration of the diffusant in the inert gas is measured over a period of time and the slope of the linear portion of that relationship is determined and is multiplied by a constant.