Abstract: Mixtures of isomers, e.g., mixtures of phenethyl bromide and 1-phenyl-1-bromoethane, are separated by (a) selectively condensing one such isomer with an aromatic compound bearing at least one aryl (nuclear) hydrogen atom, e.g., xylene, in the presence of a catalytically effective amount of a Friedel-Crafts catalyst, e.g., ferric chloride, and then (b) separating the product of condensation, e.g., phenylxylylethane, from the unreacted isomer.

Abstract: Novel heat-sensitive recording media include a support substrate, e.g., paper or a synthetic polymer film, having a thermosensitive recording layer deposited thereon, such thermosensitive recording layer comprising a colorant precursor, a heat-sensitive developer therefor and at least one polyphenylmethane of the formula (A1): ##STR1## in which R.sub.1 and R.sub.2, which may be identical or different, are each a halogen atom, NO.sub.2, CN, OCH.sub.3, H or an alkyl radical having up to 5 carbon atoms; n is 3, 4 or 5; p is 1, 2 or 3; g is 0 or 1 and the maximum value of p+g is 2; and the melting point of which polyphenylmethane being at least 50.degree. C.

Abstract: The process for the separation of isomeric dichlorotoluenes, comprising the steps of:(a) passing a mixture containing isomeric dichlorotoluenes over a zeolite of the ZSM5 type having the composition (expressed in molar ratios) of (0.9+0.2) M.sub.2/n O:Al.sub.2 O.sub.3 : (10-100) SiO.sub.2 : z H.sub.2 O in which M is at least one cation selected from H, an alkali metal, an alkaline earth metal or a tetraalkylammonium cation; n is the valency of M; and z is between 0 and 40:(b) separating the non-adsorbed dichlorotoluenes;(c) contacting the zeolite containing the adsorbed isomers with an eluent; and(d) separating the isomers from the eluent.

Abstract: Microcapsules containing a color-forming material and a solvent therefor, the solvent being a mixture of certain oligomeric isomers of benzylcumene and its higher homologues and a mixture of isomers of bis(isopropylphenyl) phenylmethane.

Abstract: The arylsulfonyl(alkyl)amides, notably N-(n-butyl)benzenesulfonamide, well adopted as heat-stable plasticizers for polyamides, e.g., nylon 11 and nylon 12, are directly prepared by (a) intimately contacting an arylsulfonyl halide with a stoichiometric excess of both an alkylamine and an alkaline agent, with the alkaline agent being present in aqueous solution, (b) eliminating water and excess alkylamine from the organic phase produced in stage (a), and (c) separating final product arylsulfonyl(alkyl)amide from the residual organic phase remaining after stage (b).

Abstract: Polyarylalkane oligomer compositions consisting essentially of a mixture of isomers of xylyl-xylene and of higher homologues and a mixture of isomers of bis(dimethylphenyl)xylylene and of higher homologues; the method of making such compositions by first reacting toluene, xylene, or a mixture of toluene and xylene with chlorine in the presence of a radical generator, removing the unreacted toluene, and then subjecting the reaction product to the action of an inorganic halide or inorganic acid in the presence of xylene, and microcapsules containing color-forming material wherein the compositions are used as solvents for the color-forming material.

Abstract: Polyarylalkane oligomer compositions containing essentially of a mixture of isomers of benzylcumene and its higher homologues and a mixture of isomers of bis(isopropylphenyl)phenylmethane; the method of making such compositions by first reacting chlorine with toluene, xylene, or a mixture of toluene and xylene in the presence of a radical generator, removing the unreacted toluene and/or xylene, and then subjecting the reaction product to the action of an inorganic halide or of an inorganic acid in the presence of a benzene-related compound; and microcapsules containing color-forming material wherein the compositions are used as solvents for the color-forming material.

Abstract: A process for separating dichlorotoluene isomers from a mixture containing at least two dichlorotoluene isomers comprising(a) passing said mixture containing dichlorotoluene isomers through a mordenite having the following composition; in molar ratios:a H.sub.2 O: b M.sub.2/n O: Al.sub.2 O.sub.3 : (10-400 SiO.sub.2)in which M is hydrogen or at least one cation selected from an alkali metal or an alkaline-earth metal with the exception of cesium and rubidium, n is the valence of M, 0.7.ltoreq.a+b.ltoreq.1.1, and 0.ltoreq.b.ltoreq.0.2,(b) separating the non-adsorbed dichlorotoluenes from said mordenite,(c) contacting said mordenite containing the adsorbed isomers with a desorbent capable of separating said isomers from said mordenite, and(d) separating the desorbed isomers from the desorbent.

Abstract: A liquid composition comprising a mixture of isomers of essentially diisocyanates having the diphenylmethane structure, the distribution by weight of isomers in the composition for each 100 parts by weight of the composition being:32 to 55% of the 4,4' isomer,30 to 45% of the 2,4' isomer,5 to 12% of the 3,4' isomer,4 to 10% of the 2,2' isomer, and2 to 5% of the 2,3' isomer;and the method of making the composition by first reacting a benzyl halide with benzene, followed by nitration, hydrogenation, and phosgenation.

Abstract: Polyarylalkane oligomer compositions comprising a mixture of two oligomers A and B, wherein oligomer A is a mixture of isomers of formula: ##STR1## with n1 and n2=0, 1 and 2, given that n1+n2.ltoreq.3; and oligomer B is a mixture of isomers of formula: ##STR2## with n'1, n"1 and n4=0, 1 and 2, n'2, n"2, n3, n'3 and n5=0 and 1, given that n'1+n"1+n'2+n"2+n3+n'3+n4+n5.ltoreq.2.The invention also comprises the process for the preparation of said oligomer compositions by the action of a halide or inorganic acid on a product of free-radical chlorination of toluene.

Abstract: New compounds of the formula: ##STR1## where n, x, y and z have value 1 or 2, their process of preparation and their use as dielectrics such as insulating fluids for transformers alone or in mixture with one or more products of general formula: ##STR2## where a varies from 2 to 4, b varies from 0 to 2 and R is an aliphatic hydrocarbon radical containing from 1 to 3 carbon atoms.