Abstract: The organosilicon compounds have at least one Si--C-bonded organic radical which contains at least one triazene group. The organosilicon compounds can be employed as heat- and light-unstable free radical initiators for the preparation of homo-, graft co- and block copolymers from olefinically unsaturated compounds and for crosslinking organosilicon compounds and organic compounds which can be polymerized by free radical polymerization.

Abstract: The invention relates to a process by which organosilicon compounds carrying sulfur-containing organic radicals can easily be prepared by reacting organosilicons of the general formulaR.sub.a (R.sup.1 O).sub.b R.sup.2.sub.c SiO.sub.(4-a-b-c)/2(I)in whichR can be identical or different and is a monovalent organic radical,R.sup.1 can be identical or different and is a hydrogen atom or a monovalent organic radical,R.sup.2 can be identical or different and is a radical --QX, where Q is a divalent hydrocarbon radical and X is a halogen atom,a is 0, 1, 2 or 3,b is 0, 1, 2 or 3 andc is 0, 1, 2 or 3,with the proviso that the organosilicon compound has at least one radical R.sup.2 per molecule and the sum of a, b and c is less than or equal to 4, with sulfite in the presence of water.

Abstract: Compositions which comprise(A) a polymeric organosilicon compound having 1 to 6 Si-bonded hydrogen atoms per molecule,(B) a polymeric organosilicon compound having at least two alkenyl groups per molecule and a viscosity of not more than 100 mm.sup.2 /s,(C) a polymeric organosilicon compound having on average at least 10 Si-bonded hydrogen atoms per molecule,(D) a catalyst and, optionally(E) an inhibitor,with the proviso thatthe molar ratio of all the Si-bonded hydrogen atoms to all the SiC-bonded alkenyl groups in the composition is on average less than 1,the composition comprises (B) in an amount such that the composition comprises on average at least 1.1 alkenyl radicals of (B) per Si-bonded hydrogen atom of (A)and the content of Si-bonded hydrogen atoms of (C) is 5% to 50%, based on the number of all the Si-bonded hydrogen atoms present.

Abstract: The invention relates to crosslinked organopolysiloxanes which contain groups which form free radicals and are built up from units of the formula[R.sub.a Si(O.sub.(3-a)/2)-R.sup.1 -X-(R.sup.1 -Si(O.sub.(3-a)/2)).sub.b R.sub.a ] (1),in whichX is a radical from the group consisting of --N.dbd.N--, --O--O--, --S--S-- and --C(C.sub.6 H.sub.5).sub.2 --C(C.sub.6 H.sub.5).sub.2 --, andR is monovalent SiC-bonded, optionally substituted C.sub.1 - to C.sub.18 -hydrocarbon radicals,R.sup.1 is divalent SiC-bonded, optionally substituted C.sub.1 - to C.sub.18 -hydrocarbon radicals which can be interrupted by divalent radicals, bonded to carbon atoms on both sides, from the group consisting of --O--, --COO--, --OOC--, --CONR.sup.2 --, --NR.sup.2 CO-- and --CO--,R.sup.2 is a hydrogen atom or a radical R,a has the values 0, 1 or 2 andb has the values 0 or 1,and further organosiloxane units. The organopolysiloxanes are used as free radical macroinitiators for grafting polymerization of ethylenically unsaturated monomers.

Abstract: Novel catalysts of the general formulaMX.sub.a Y.sub.b,in whichM is Pt, Pd, Rh, Ru, Os or Ir,X is a triazene, tetrazene, tetrazadiene or pentazadiene ligand,Y is a ligand selected from Cl, Br, I, NH.sub.3, P(C.sub.2 H.sub.5).sub.3, P(C.sub.6 H.sub.5).sub.3, H, CO, 1,5-cyclooctadiene, pyridine, bipyridine, acetate, acetylacetonate, phenylnitrile, ethylenediamine, acetonitrile, 2,5-norbornadiene, nitrate, nitrite, H.sub.2 O, benzene, diphenylphosphinoethane and 1,3-divinyl-1,1,3,3-tetramethyldisiloxane,a is 1, 2, 3 or 4 andb is 0 or an integer from 1 to 6, are described.The catalysts promote the addition of Si-bonded hydrogen onto an aliphatic multiple bond, in which the catalysts are activated by heating at temperatures of 50.degree. to 250.degree. C., by irradiation with light, by addition of Bronsted acids and/or by addition of acid-forming agents.

Abstract: Organosilicon compounds having Si-bonded hydrogen atoms are reacted with organic compounds having aliphatic multiple bonds in the presence of triazene oxide-transition metal complexes. The triazene oxide-transition metal complexes are activated by heating at temperatures of from 50.degree. C. to 250.degree. C. and/or by irradiation with light.

Abstract: The aqueous emulsions based on(a) 100 parts by weight of organopolysiloxanes which contain polar groups on Si--C-bonded hydrocarbon radicals and(b) not more than 50 parts by weight of alkyl polyglycosides which are stable toward high concentrations of foreign electrolytes.

Abstract: Organopolysiloxanes which contain ester groups and comprise units of the formula ##EQU1## in which R may be an identical or different monovalent, SiC-bonded hydrocarbon radical having 1 to 18 carbon atoms,A may be an identical or different radical of the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3, c, v, w, s, t,is 0 or an integer, the sum of s and tbeing an integer from 1 to 20,x is 0 or 1,y is 0 or 1, the sum of x and y being 1 or 2,a is 0, 1, 2 or 3, andb is 0, 1 or 2,with the proviso that the sum of a and b is less than or equal to 3 and the organopolysiloxane contains at least one radical A per molecule.

Abstract: Organosiloxanes comprising at least one chemically bonded transition metal complex of Pt, Pd, Rh, Ru, Os or Ir, having a triazene, tetrazene, tetrazdiene, pentazdiene or triazene oxide ligand and are used as hydrosilylation catalysts that can be activated by light and/or heat.

Abstract: The present invention relates to oxygen-containing chlorophosphazenes containing organosilicon radicals, in particular those of the formulaZ-PCl.sub.2 =N(-PCl.sub.2 =N).sub.n -PCl.sub.2 O (I)in whichZ is an organosilicon radical bonded to phosphorus via oxygen andn is from 0 to 6, processes for their preparation and their use in processes for the condensation and/or equilibration of organosilicon compounds.

Abstract: Process for the preparation of an organopolysiloxane resin, which comprisesin a first stage reacting at least one silane of the formulaR.sub.a Si(OR.sup.1).sub.4-a (I)in which a has a value of 0, 1, 2 or 3, R and R.sup.1 are monovalent organic radicals which may be the same or different and/or a partial hydrolyzate thereof, with the proviso that at least one silane of formula (I), where a is 0 or 1 and/or a partial hydrolyzate thereof is employed, and optionally an organo(poly)siloxane with water in the presence of a poly-protic acid and optionally other substances, subsequently partly neutralizing the acid by addition of a base and then distilling off at least some of the compound R.sup.1 OH formed,in a second stage reacting the homogeneous reaction mass resulting from the first stage in the presence of a base and a water-insoluble organic solvent and distilling off the water and the compound R.sup.

Abstract: A process for preparing organopolysiloxane hydrosols by mixing an organosilicon compound with water, which comprises mixing a silane of the formulaR.sub.a Si(OR.sup.1).sub.4-a (I)where a is 0, 1, 2 or 3, R can be the same or different and is a hydrogen atom or a monovalent organic radical, R.sup.1 can be the same or different and is a monovalent organic radical, and/or a partial hydrolysis product thereof and, optionally, an organodisiloxane of the formulaR.sup.2.sub.3 Si-O-SiR.sup.2.sub.3 (II)where R.sup.2 can be the same or different and is the same as R, with water in the presence of an emulsifier at a temperature below 15.degree. C.

Abstract: Siloxane copolymers containing alkenyl groups are prepared by reacting an organic compound (1) containing at least two aliphatic double bonds of the general formulaR.sup.2 (CR.sup.3 .dbd.CH.sup.2).sub.xin which R.sup.2 is a divalent, trivalent or tetravalent hydrocarbon radical having from 1 to 25 carbon atoms per radical, R.sup.3 is a hydrogen atom or an alkyl radical having from 1 to 6 carbon atoms per radical and x is 2, 3 or 4, with an organopolysiloxane (2) having an average of more than one Si-bonded hydrogen atom per molecule, in the presence of a catalyst (3) which promotes the addition of Si-bonded hydrogen to an aliphatic double bond, in which the ratio between the aliphatic double bond in the organic compound (1) and the Si-bonded hydrogen in the organopolysiloxane (2) is such that the alkenyl containing siloxane copolymers thus obtained have an average of more than one alkenyl group per molecule of the formula --CR.sup.3 .dbd.CH.sup.2, in which R.sup.3 is the same as above.

Abstract: Elastomeric particulate copolymers having a core/shell structure composed of a core (a) comprising an organosilicon polymer and an organopolymeric shell (c) or two shells (b) and (c), the inner shell (b) comprising an organosilicon polymer, and the copolymer being composed of (a) from 0.05 to 95 percent by weight, based on the total weight of the copolymer, of a core polymer (R.sub.2 SiO.sub.2/2).sub.x.(RSiO.sub.3/2).sub.y.(SiO.sub.4/2).sub.z where x=0 to 99.5 mol%, y=0.5 to 100 mol% and z=0 to 50 mol%, (b) from 0 to 94.5 percent by weight, based on the total weight of the copolymer, of a polydialkylsiloxane shell comprising (R.sub.2 SiO.sub.2/2) units, and (c) from 5 to 95 percent by weight, based on the total weight of the copolymer, of a shell comprising an organopolymer of monoolefinically unsaturated monomers, and the particles have a particle size of from 10 to 300 nm and a monomodal particle size distribution having a maximum polydispersity index .sigma..sub.2 =0.2.

Abstract: Organosilicon compounds which contain Bunte salt groups and contain units of the general formula ##STR1## wherein R is a hydrogen atom or a monovalent organic radical, R.sup.1 is a hydrogen atom or a monovalent organic radical, R.sup.2 is a radical --QS.sub.2 O.sub.3 M, where Q is a divalent hydrocarbon radical and M is an alkali metal radical or optionally a substituted ammonium radical, a is 0, 1, 2 or 3, b is 0, 1, 2 or 3, and c is 0, 1, 2 or 3, processes for preparing the organosilicon compounds and their use are described.

Abstract: The Thermocurable compositions which contain(A) at least one mercaptoalkyl-containing compound which contains at least two SiC-bonded radicals per molecule of the general formulaHS--R.sup.2 -- (I)where R.sup.2 represents a divalent hydrocarbon radical having from 1 to 8 carbon atom(s) per radical, selected from the group consisting mercaptoalkyl-containing organopolysiloxanes and cocondensates of mercaptoalkyl-containing organosilicon compounds containing groups capable of condensation, and hydroxyl-containing organic compounds,(B) at least one vinyl-containing compound which is compatible with constituent (A) and contains at least two groups per molecule of the general formulaR.sup.4 CH.dbd.CR.sup.3 C(O)O-- (II)where R.sup.3 represents a hydrogen atom or a methyl radical, and R.sup.

Abstract: Organosols of organopolysiloxanes are prepared by adding water-soluble organic solvents or mixtures thereof or water-soluble mixtures of water-soluble and water-insoluble organic solvents to aqueous, colloidal suspensions of organopolysiloxanes obtained by adding at least one alkoxysilane and/or the partial hydrolyzate thereof, and, if appropriate, mixed with an organo(poly)siloxane free of alkoxy groups and having a maximum of 8 siloxane units per molecule, to water in the presence of emulsifiers at a maximum rate of 5 moles of organosilicon compound per hour and per liter of water, and subsequently removing the water by distillation.

Abstract: The invention relates to compounds of the formula[RSiO.sub.3/2 ].sub.z (I)in whichz is 6, 8 or 10;R represents the same or different radicals of the formulas--CH.sub.2 CH.sub.2 --X (II), --CH(CH.sub.3)--X (III) or --O--Si(R'.sub.2)--Y (IV)with the proviso that up to z-1 of the radicals can also be radicals of the formula --O--SiR'.sub.3, in which X represents a monovalent radical or one half of a divalent radical of the formulas ##STR1## R' represents the same or different C.sub.1 - to C.sub.6 -alkyl, C.sub.1 - to C.sub.6 -alkoxy or phenyl radicals;R" represents the same or different C.sub.1 - to C.sub.18 -alkyl radicals, which can be substituted by radicals of formulas (V) or (VI);R'" represents the same or different divalent C.sub.1 - to C.sub.18 -hydrocarbon radicals, preferably alkylene and/or phenylene radicals and/or radicals of the formula--(R'.sub.2 SiO).sub.n --;Z represents a halogen atom or an N-bonded amino radical, that is an NH.sub.

Abstract: A process for preparing aqueous emulsions from high-molecular-weight organopolysiloxanes which are solid at room temperature, in the absence of organic solvents, which comprises dissolving the high-molecular-weight organopolysiloxane which is solid at room temperature in a low-molecular-weight organo(poly)siloxane which is liquid at room temperature, and emulsifying this solution with water in the presence of an emulsifier and other additives, if desired.

Abstract: Thermally stable, crosslinked epoxy resins are obtained by crosslinking an epoxy resin with a silicon compound containing a basic nitrogen which is bonded to silicon via carbon and to which at least 1 hydrogen atom is bonded directly to the nitrogen atom, and thereafter conditioning the crosslinked epoxy resin.