Abstract: Storage-stable, aqueous polysiloxane emulsions well adopted as coating compositions to impart anti-adhesiveness/water-repellency to a wide variety of substrates, e.g., paper, are comprised of an anti-adhesive/water-repellency effective amount of (A) diorganopolysiloxane oil having the formula:HO(SiR.sub.2 O).sub.n Hwherein the symbols R, which may be identical or different, are each an alkyl radical containing from 1 to 3 carbon atoms, the 3,3,3-tri-fluoropropyl radical, or the vinyl radical, at least 50% of the radicals R being methyl radicals and at most 5% vinyl radicals, and the symbol n is any number, the value of which is such that the viscosity of the oil ranges from 500 to 50,000 mPa.s at 25.degree. C.; (B) an organopolysiloxane resin comprising recurring units selected from among those of the formulae R'SiO.sub.1.5, R'.sub.2 SiO and R'.sub.3 SiO.sub.0.

Abstract: Novel organopolysiloxane compositions, well adopted for use as mold release coatings, are comprised of (A) a particular diorganopolysiloxane oil containing methyl, phenylalkyl or alkyl radicals having from 7 to 15 carbon atoms, (B) an MQ organopolysiloxane copolymer resin, and (C) an inert organic diluent therefor.

Abstract: N,N'-bis(2-hydroxyethyl)oxamide is facilely prepared, e.g., in finely divided crystalline form, by reacting an alkyl oxalate with ethanolamine in an aqueous reaction medium.

Abstract: A process for the chlorination of aromatic derivatives. The aromatic derivative is reacted with chlorine gas in liquid hydrofluoric acid. The products obtained are useful as intermediates for the synthesis of compounds having a plant-protecting or pharmaceutical activity.

Abstract: A process for the preparation of benzophenones. A compound of the formula COX.sub.4 X.sub.5, where X.sub.4 and X.sub.5, which may be identical or different are halogen atoms, is reacted, in liquid hydrofluoric acid, with a deactivated benzene derivative, in the presence of boron trifluoride in such amount that the absolute pressure of boron trifluoride in the reaction space is at least one bar.

Abstract: Novel high performance disilane/organosilicon resins useful, e.g., as molding powders and textile and building waterproofing agents (either in the form of aqueous dispersions or organic solutions thereof), comprise cohydrolysis/condensation reaction products in heterogeneous solvent medium of admixture of organochlorosilanes and organochlorodisilanes, said admixture comprising:(i) from about 10 to 70 molar % of at least one diorganochlorosilane having the formula R.sub.2 SiCl.sub.2, in which the radicals R, which may be identical or different, are each hydrogen, methyl or phenyl;(ii) from about 30 to 70 molar % of at least one methylchlorodisilane which comprises at least about 30 moles % of tetrachloro-1,2-dimethyldisilane; and(iii) from 0 to about 60 molar % of at least one organotrichlorosilane having the formula R'SiCl.sub.3, in which R' is defined as is R above;and said resins having an average functionality of from about 2.2 to 3.

Abstract: Lithium metal is continuously prepared by, in a specially adapted electrolytic cell, (i) continuously electrolyzing the lithium chloride which comprises a mixture of molten salts, which mixture comprises the medium of electrolysis and such medium of electrolysis naturally circulating within an interspace defined between the electrodes of the cell, said interspace being devoid of physical barrier between said electrodes, (ii) continuously withdrawing therefrom product lithium metal in admixture with the mixture of molten salts, and (iii) continuously discharging undiluted chlorine gas therefrom.

Abstract: Aldehydes are facilely prepared in high yields by catalytically hydrocarbonylating an organic halide with gaseous admixture of hydrogen and carbon monoxide in the presence of a neutralizing agent for the hydrogen acid produced thereby, said hydrocarbonylation being carried out in an inert, liquid carboxylic acid reaction medium, i.e., a liquid carboxylic acid which is inert under the reaction conditions of temperature and pressure.

Abstract: A high specific surface hydrargillite, well adopted as filler material or primer particulates in the production of finely divided aluminum trihydroxide by decomposition of Bayer process aluminate liquors, is readily prepared by (i) reacting an alkali metal aluminate with hydrofluoric acid at a temperature ranging from about 5.degree. to 95.degree. C., the amount of said hydrofluoric acid ranging from about 25% to 90% of that amount stoichiometrically required for complete neutralization of the alkalinity of said aluminate, (ii) optionally treating the hydrargillite precipitate which results at a temperature of from about 5.degree. to 95.degree. C. for from about one-half to 10 hours, and thence (iii) recovering said hydrargillite precipitate, preferably by filtering, washing and drying.

Abstract: The polyamide polymers, notably the nylons, are effectively heat stabilized, characteristically with good retention of mechanical properties, by formulating therewith stabilizing amounts of (i) at least one lanthanide or yttrium-based compound and (ii) at least one ammonium, or alkali or alkaline earth metal halide.

Abstract: Lithium is continuously converted into lithium hydride, is suitable phase contactor/decanter apparatus, by continuously hydrogenating in a first reaction zone, at elevated temperatures, an agitated intimate admixture of metallic lithium in a mixture of molten salts, continuously discharging the effluent of said hydrogenation reaction to a second zone of decantation, whereby said effluent is separated into a floating light phase essentially consisting of unreacted lithium metal and a heavy phase which comprises product lithium hydride dissolved in said mixture of molten salts, continuously recycling floating light phase back to the hydrogenation reaction zone, continuously withdrawing heavy phase from said zone of decantation, and recovering product lithium hydride from said withdrawn heavy phase.

Abstract: Organopolysiloxane compositions readily cross-linked into elastomers, e.g., elastomeric seals, and advantageously formulated in either one- or two-component packages, are comprised of (A) a polyhydroxylated polysiloxane, (B) a polyacyloxysilane cross-linking agent and (C) a hardening accelerator therefor, said hardening accelerator being protectively microencapsulated within impermeable outer skin membranes adopted to be chemically or physically disrupted, e.g., by heat, irradiation or mechanical breaking, to permit the release of said accelerator (C) therefrom and consequent curing of the composition.

Abstract: Silane, SiH.sub.

Abstract: Cerium based glass polishing compositions, well adapted for the polishing, e.g., of optical glass, are comprised of (i) at least one crystalline phase of CeO.sub.2 type, and (ii) a crystalline phase which comprises a rare earth pyrosilicate having the formula Ln.sub.2-x Ce.sub.x Si.sub.2 O.sub.7, wherein Ln is at least one lanthanide or yttrium and x is a number ranging from zero to less than 2.

Abstract: Curable organopolysiloxane compositions useful, e.g., for the production of anti-stick coatings, comprise (1) an organopolysiloxane, (2) an organohydropolysiloxane, (3) a platinum group metal hardening catalyst, and (4) a platinum catalysis inhibitor comprising an acetylenic .alpha.-ketone in an amount which inhibits gelation at ambient temperatures but does not prevent cross-linking at temperatures in excess thereof.

Abstract: In the treatment of the swimming pool water, the water is continuously withdrawn from the pool and brought into contact with semi-permeable membranes of a separating apparatus. The fraction of the water which has passed through the membranes is returned to the pool.

Abstract: Plastic substrata are metallized, preferably by direct electrolytic metallization, by (i) providing a plastic shaped article comprising intimate admixture of a polymeric resin and a plurality of small metallic filler particles of a non-conductive oxide of a non-noble metal uniformly dispersed therethrough, at least one of the face surfaces of said shaped article having exposed thereon such high density of said metallic filler particles as to provide in step (ii) metallization growth nuclei adapted for direct electrolytic metallization; (ii) next subjecting said at least one face surface of said plastic shaped article to the action of a reducing agent to essentially quantitatively convert the non-conductive metal oxide filler particles to conductive free metal, metallization growth nuclei; and (iii) thence electrochemically and/or electrolytically metallizing the at least one reduced face surface of said plastic shaped article with a free metal deposit.

Abstract: A process for preparing perfluoroalkanols by hydrogenation of the corresponding aliphatic perfluoroacids. An acid of the formula:C.sub.n F.sub.2n+1 COOHin which n is greater than or equal to 1, is reacted with hydrogen, in the presence of a catalyst based on ruthenium, rhodium, iridium or platinum, under a total pressure of between 1 and 50 bar and in the presence of at least one additive chosen from the group comprising the halide anions and the metal cations of columns IB, IIB, IVA, VA and VB of the periodic table of the elements.

Abstract: A process for the stimulaneous halogenation and fluorination of aromatic derivatives substituted by at least one group containing a halogenoalkyl unit. The aromatic derivative is reacted with the halogen in liquid hydrofluoric acid. The products obtained are useful as intermediates for the synthesis of compounds having a plant-protecting or pharmaceutical activity.

Abstract: Hydrogenosilanes are facilely prepared by redistribution, by reacting (1) a silane having the formula H.sub.m SiX.sub.4-m in which X is halogen or an alkoxy group and m is an integer equal to 0, 1, 2, or 3, with (2) an alkyl or aryl hydrogenosilane having the formula R.sub.n H.sub.p SiX'.sub.4-(n+p) in which X' is halogen or an alkoxy group, R is at least one alkyl or aryl group, which may be identical or different, and n and p, which may be identical or different, are integers equal to 1, 2 or 3, with the proviso that n+p.ltoreq.4, in the presence of (3) a catalytically effective amount of a catalyst system which comprises (i) at least one ionic inorganic salt having the formula M.sup.+ A.sup.- and (ii) a compound which complexes the M.sup.+ cation of said salt (i) and at least partially solubilizes and dissociates same in the medium of reaction.