Abstract: The present invention relates to chemically stable, polyfunctional, perfluorinated polyorganosiloxanes (POS) comprising on the one hand fluorinated lateral grafts resulting from the hydrosilylation of perfluorinated olefins with SiH units and having alkyl and/or alkyl ester linkages but not ether linkages, and on the other hand other, non-perfluorinated functional units E capable of giving them diverse and varied physical and chemical properties and opening up avenues in numerous applications. Examples of these POS according to the invention are those of the following formula: According to another of its features, the invention relates to a process for the preparation of these polyfunctional perfluorinated POS. Applications: antifoams, agents for lowering surface tension, dirt repellents, antiadhesives, lubricants, oleophobic and/or hydrophobic agents, coatings etc.

Abstract: Chemicaly stable, perflourinated, linear or cyclic polyorganosiloxanes (POS), and a process for the preparation thereof. Antifoams, agents for lowering surface tension, dirt repellents, antiadhesives, lubricants, oleophobic and/or hydrophobic agents, coatings and other compositions containing the perfluorinated POS are disclosed.

Abstract: The hydroxylated inorganic oxide support is functionalized by grafting at least one type of polyhydrosiloxane oil having from 10 to 200 siloxane units, the grafting being provided, on the one hand, by covalent bonds formed from a dehydrogenation/condensation reaction between Si-H groups of the polyhydrosiloxane oil and free hydroxyls of the hydroxylated support and, on the other hand, by hydrogen bonds between hydroxyls of the hydroxylated support and oxygen atoms of the polyhydrosiloxane oil, which exhibits free SiH groups.

Abstract: The present invention relates to compounds composed essentially of a linear, cyclic or branched polyorganosiloxane having, per molecule, at least 3 siloxy units, including at least one siloxy functional unit of formula: ##STR1## where R.sup.1 represents a C.sub.1 to C.sub.4 alkyl or phenyl radical, X contains an N,N'-di- and/or trisubstituted phenylenediamine functional group, bonded to the silicon via an Si-(hydrocarbon linking unit)-N and/or Si-(hydrocarbon linking unit)-C bond, and a is a number chosen from 0, 1 and 2. The present invention also relates to the use of such compounds as antiozonants for rubbers and in particular for rubber compositions for tires.

Abstract: Chemically stable, perfluorinated, linear or cyclic polyorganosiloxanes (POS), and a process for the preparation thereof. Antifoams, agents for lowering surface tension, dirt repellents, antiadhesives, lubricants, oleophobic and/or hydrophobic agents, coatings and other compositions containing the perfluorinated POS are disclosed.

Abstract: The present invention relates to linear, cyclic or branched polyorganosiloxanes having, per molecule, at least three siloxy units, including at least one functional unit of formula: ##EQU1## where R.sup.1 represents a C.sub.1 to C.sub.4 alkyl or phenyl radical and X contains a secondary or tertiary cyclic amine functional group bonded to the silicon via an Si--A--C bond where A is a residue comprising a cyclic acetal group. X more specifically represents a monovalent group of formula: ##STR1## The present invention also relates to the use of such polyorganosiloxanes in polymers for improving in particular their photostabilization.

Abstract: The present invention relates to compounds composed essentially of a linear, cyclic or branched polyorganosiloxane having, per molecule, at least 3 siloxy units, including at least one siloxy functional unit of formula: ##STR1## where R.sup.1 represents a C.sub.1 to C.sub.4 alkyl or phenyl radical, X contains an N,N'-di- and/or trisubstituted phenylenediamine functional group, bonded to the silicon via an Si--(hydrocarbon linking unit)--N and/or Si--(hydrocarbon linking unit)--C bond, and a is a number chosen from 0, 1 and 2. The present invention also relates to the use of such compounds as antiozonants for rubbers and in particular for rubber compositions for tires.

Abstract: Novel nonlinearly optically active compound's, well suited for electrooptical applications, have the following general formulae: ##STR1## wherein D is an electron donor group; A and A.sub.1, which may be identical or different, are each an electron acceptor group; and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a lower alkyl radical or a hydrogen atom.

Abstract: Monodisperse, homogeneous polyaminoborazines, well suited for pyrolysis into ceramic BN shaped articles, e.g., fibers, films, etc., are prepared by thermally polycondensing a trifunctional aminoborazine under conditions of polycondensation reaction equilibrium.

Abstract: Nonlinearly optically active monomer species comprising at least two carbon-carbon activated double bonds, i.e., the polymerization of which is facilitated by the presence of an electron attracting function, and a non-centrosymmetric system of pi (.pi.

Abstract: Novel nonlinearly optically active compounds, well suited for electrooptical applications, have the following general formulae: ##STR1## wherein D is an electron donor group; A and A.sub.1, which may be identical or different, are each an electron acceptor group; and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a lower alkyl radical or a hydrogen atom.

Abstract: Nonlinearly optically active monomer species comprising at least two carbon-carbon activated double bonds, i.e., the polymerization of which is facilitated by the presence of an electron attracting function, and a non-centrosymmetric system of pi (.pi.

Abstract: Novel boron/nitrogen compounds having the formula (1): ##STR1## and the products of the at least partial reduction thereof, are converted into BN ceramic materials by thermally polymerizing same, whether or not in the presence of suitable polymerization catalyst, and then pyrolyzing the boron/nitrogen polymers thus obtained.

Abstract: Acetylenic derivatives of general formula ##STR1## in which R.sub.1 denotes a hydrogen atom or a phenyl radical or a radical of general formula ##STR2## in which R.sub.2 and R.sub.3, which may be identical or different, denote a hydrogen atom or a saturated or unsaturated aliphatic radical, substituted if appropriate, or form together a cycloaliphatic radical, R.sub.4 denotes a hydrogen atom or a saturated or unsaturated aliphatic radical, a hydroxy, alkyloxy, methanesulphonyloxy, benzenesulpnonyloxy or p-toluenesulphonyloxy radical, R.sub.5 denotes a hydrogen atom or a saturated aliphatic radical, R.sub.6 denotes a hydrogen atom or a saturated or unsaturated aliphatic radical are made by reaction of an acetylenic derivative of general formulaR.sub.1 --C.tbd.C--H (III)with an allyl derivative of general formula ##STR3## in the presence of a cuprous salt and an anhydrous organic base. The compounds of formula (I) are useful in organic synthesis, in particular in the preparation of the vitamins A and E.

Abstract: Novel organosilicon compounds having a second order hyperpolarizability coefficient .beta. greater than zero, well suited for use in the field of nonlinear optics, e.g., in telecommunication devices, have the general formula: ##STR1## which n is an integer ranging from 1 to 20; R.sub.1 is an electron donating group; R.sub.2 is an electron accepting group; R.sub.3 is an alkyl radical having from 1 to 8 carbon atoms, a hydrogen atom, an aryl radical, or an R.sub.1 or R.sub.2 radical; and R.sub.4 is an alkyl radical having from 1 to 8 carbon atoms, a hydrogen atom, an aryl radical, or an R.sub.1 radical when R.sub.3 is not an R.sub.2 radical or an R.sub.2 radical when R.sub.3 is not an R.sub.1 radical.

Abstract: Novel nonlinearly optically active polymers, well suited for electrooptical applications, are prepared by copolymerizing a first difunctional monomer with a second difunctional comonomer, with at least one of such difunctional monomers including a polar charge transfer moiety containing at least one electron acceptor group and at least one electron donor group (D), and further wherein the polymerizable functional groups are borne by the one or more electron donor groups (D).

Abstract: Organometallic boron/nitrogen polymers, precursors of boron nitride, are prepared by reacting at least one trihalogenoborane with at least one silazane compound containing at least one .tbd.Si--NH--Si.tbd. group, by gradually introducing the silazane compound into the trihalogenoborane, while maintaining the reaction medium at a temperature ranging from -100.degree. to 0.degree. C. and wherein the ratio of the gram equivalents of the .tbd.Si--NH--Si.tbd. groups of the silazane to the number of moles of trihalogenoborane is greater than 1; the resulting organometallic polymers are facilely pyrolyzed into boron nitride ceramic materials.

Abstract: The present invention relates to new thiphene-related compounds of the general formula (I): ##STR1## in which: n is an integer between 1 and 10, advantageously between 1 and 4;A is an electron-acceptor group; and D is an electron-donor group.These compounds exhibit a high hyperpolarizability and an excellent photochemical stability and are employed especially in optical or electrooptical devices for their activity in nonlinear optics.

Abstract: Boron/nitrogen/silicon preceramic polymers are prepared by copolymerizing at least one trihaloborane with at least one disilazane and at least one B-trichloroborazine; the resulting polymers, advantageously in fibrous form, are then facilely crosslinked and pyrolyzed into boron nitride ceramic materials.

Abstract: Crosslinked random boron/nitrogen preceramic polymers are prepared by reacting (a) admixture of a trihalogenoborane A and a cyclic boron/nitrogen compound B containing recurring structural units of the following general formula (1): ##STR1## in which A is a halogen atom and R is a hydrogen atom, or a hydrocarbyl, organosilyl or hydrogenoorganosilyl radical, with (b) an amino compound C containing at least one --NH.sub.2 group; the resulting polymers are facilely pyrolyzed into boron nitride ceramic materials.