Abstract: A method for the cleavage of organosiloxanes with chlorosilanes in the presence of ferric chloride and hydrogen chloride as catalysts resulting in chloroalkyl silanes or chloroaryl silanes, and organosiloxanes, which are characterized by one or more --O--Si--R.sub.3 groups, (R.dbd.alkyl or aryl), which are directly bound to a silicon atom which in turn is bound either to the same grouping or to an alkyl or aryl moiety.

Abstract: A method is disclosed for the synthesis of SiH-containing organopolysiloxanes from the corresponding Si-halogen-containing organopolysiloxanes by the reaction with metal hydrides in a liquid reaction medium. The method has the following combiniation of characteristics:(a) the use of a metal hydride being LiH, NaH, KH, CaH.sub.2 or MgH.sub.2 ;(b) the use of ethers as reaction medium;(c) the continuous removal of the metal halide depositing on the surface of the metal hydride particles during the reaction by the action of mechanical energy or ultrasound with formation of a fresh surface.The reaction proceeds practically quantitatively and at low temperatures. It can be applied with particular advantage to industrially obtained mixtures of .alpha.,.omega.-dichloroorganopolysiloxanes.

Abstract: A modified hydrophobic colored or magnetic pigment or filler comprising a hydrophobic pigment or filler containing from 0.05 to 10% by weight, based on the weight of the pigment or filler, of an organopolysiloxane corresponding to the formula ##STR1## wherein x=0 to 500,y=5 to 500,z=5 to 500,R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 denote, independently of one another, a saturated and/or unsaturated, unbranched or branched alkyl group haviang 1 to 4 carbon atoms and/or an aryl group having 6 to 9 carbon atoms, said aryl group being unsubstituted or alkyl substituted,R.sup.7 is a straight chained or branched alkyl group having 6 to 18 carbon atoms and R.sup.7 and H each amount to at least 3% of the number of groups attached to Si.

Abstract: The method of this invention produces an elastomeric silicone sealant having an improved shelf life. The sealant comprises an alkoxysilethylene ended polydiorganosiloxane polymer, an alkoxytrialkoxysilane crosslinker, and a titanium catalyst.

Abstract: An efficient method is proposed for the preparation of an organosiloxane oligomer represented by the general formula YSi(R.sup.1).sub.n (--O--SiR.sub.3).sub.3-n, in which each of the groups denoted by R and R.sup.1 is a halogen-substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms, Y is a hydrogen atom or a monovalent group selected from methyl, phenyl, vinyl, chloromethyl and 3-(meth)acryloxypropyl groups and n is zero, 1 or 2, by the reaction of an organosilicon halomagnesium salt of the formula R.sub.3 Si--O--MgX, in which X is a halogen atom, and an organosilane compound of the general formula YSi(R.sup.1).sub.n (Z).sub.3-n, in which Z is a halogen atom or a lower alkoxy group. In particular, tetrasiloxane compounds represented by the general formula Y.sup.1 Si[--O--Si(CH.sub.3).sub.2 (CH.sub.2 CH.sub.2 CF.sub.3)].sub.3, in which Y.sup.1 is a hydrogen atom, chloromethyl group or 3-methacryloxypropyl group, are each a novel compound not known in the prior art.

Abstract: Novel UV-curable silicone release coating compositions and photocatalysts therefor are provided which include hydrogen-functional and vinyl-functional photoreactive terpolymers, which are especially compatable with certain perbenzoate ester photocatalysts. The addition of certain polyaromatic photosensitizers to enhance cure is also disclosed.

Abstract: Epoxy- and/or acrylic-functional polysiloxanes are disclosed which, when combined with onium salt photoinitiating catalysts or free-radical photoinitiating catalysts or both, form ultraviolet radiation-curable release coating compositions which render surfaces non-adherent to other surfaces which would normally adhere thereto. The compositions will cure to such an adhesive state upon brief exposure to ultraviolet radiation. Cure and substrate adhesion may be enhanced by the addition of epoxy monomers where onium salt photocatalysts are included. Preparation of the polymers, coating compositions, catalysts and catalyst blends are also disclosed.

Abstract: A method is provided for hydrolyzing chlorosilanes, for example, dimethyldichlorosilane, to produce dimethylpolysiloxane hydrolyzate and an aqueous solution of hydrogen chloride along with anhydrous hydrogen chloride. Chlorosilane hydrolysis is effected in the presence of a substantially stoichiometric equivalence of water which results in the direct generation of anhydrous hydrogen chloride and a saturated aqueous hydrogen chloride solution. The saturated aqueous solution of hydrogen chloride can be recycled to the chlorosilane hydrolysis step.

Abstract: Disclosed is an organocyclosiloxane which comprises a compound having the following formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3, which may be the same or different, represent a hydrogen atom or a monovalent hydrocarbon group having 1 to 8 carbon atoms; Y represents ##STR2## m is an integer of 3 to 5 and n is an integer of 1 to m.

Abstract: Novel radiation-curable, liquid vinyl-hydro copolymers and coating compositions which are free of volatile solvent(s) and which are adapted to be applied to a substrate and cured rapidly by exposure to radiation to form release coatings having good release properties with respect to adhesives and methods for producing such polymers and compositions and for applying and curing such release coatings are disclosed.

Abstract: Epoxy- and/or acrylic-functional polysiloxanes are disclosed which, when combined with onium salt photoinitiating catalysts or free-radical photoinitiating catalysts, or both, form ultraviolet radiation-curable release coating compositions which render surfaces non-adherent to other surfaces which would normally adhere thereto. The compositions will cure to such an adhesive state upon brief exposure to ultraviolet radiation. Cure and substrate adhesion may be enhanced by the addition of epoxy monomers where onium salt photocatalysts are included. Preparation of the polymers, coating compositions, catalysts and catalyst blends are also disclosed.

Abstract: A very efficient method is proposed for the synthetic preparation of pentamethylcyclotrisiloxane by the ring-closing reaction between 1,1,3,3-tetramethyl-1,3-dihydroxy disiloxane and a methyl dialkenyloxysilane such as methyl diisopropenyloxysilane at a moderate temperature in a solution with an organic solvent.

Abstract: Siloxane-oxyalkylene block copolymer compositions are prepared by a hydrosilylation reaction, using a saturated higher alcohol, such as isostearyl alcohol, as the reaction solvent. The reaction solvent need not be removed from the resulting block copolymer, particularly when the block copolymer is used as an emulsifier in personal care compositions.

Abstract: The preparation of pure mixed alkoxyaminosilanes is described corresponding to the general formula:R.sub.m Si(OR').sub.n (NR"R'").sub.pwherein:R is hydrogen, short chain alkyl or alkenyl or aryl;R" and R'" are separately either hydrogen, short chain alkyl or aryl, at least one being other than hydrogen;R' is short chain alkyl or aryl; andm, n and p are integers such that m+n+p=4 and n and p are at least one each.The obtained compounds are employed in endcapping of polysiloxanes having terminal silane groups.

Abstract: Compositions are disclosed consisting essentially of: (A) a polydiorganosiloxane fluid in which the organic radicals are predominantly or wholly methyl radicals; (B) a chlorendate diester; (C) a lubricant compound which is an antimony or lead compound of a dialkyldithiocarbamate or dialkylphosphorodithioate; and (D) a block copolymer comprising blocks of polydimethylsiloxane and blocks of polybutadiene or hydrogenated polybutadiene. These compositions are useful as concentrates for replenishing polydiorganosiloxane hydraulic fluids that have become depleted in additives (B) and (C), and as hydraulic fluids having improved resistance to settling of the lubricant compound at low temperatures.

Abstract: A particular silicone dielectric fluid, having aliphatic hydrocarbon or substituted aliphatic hydrocarbon substituents, with a specific gravity of at least 1.02, is employed to encapsulate and insulate an electrical cable splice. The same particular silicone dielectric fluid, with a specific gravity of at least 1.02 is also used to fill an electrical cable's conductor interstices.

Abstract: A particular dielectric fluid, having a composition with a specific gravity of at least 1.02 and consisting essentially of a silicone fluid and an additive, soluble in said silicone fluid, selected from the group consisting of trimethylsilyl treated (CH.sub.3).sub.3 SiO.sub.1/2 /SiO.sub.2 resin copolymer, dipropyleneglycoldibenzoate, dixylylethane, phenylxylylethane, and a mixture of [(CH.sub.3).sub.3 Si].sub.2 O treated silica and a silica aerogel, is employed to encapsulate and insulate an electrical cable splice. The same particular dielectric field composition is also used to fill an electrical cable's conductor interstices.

Abstract: A process is described by which numerous waste or by-product chlorosilane streams can be treated to obtain a granular gel that is easily handleable in further processing steps, shipment, or disposal operations. By hydrolyzing a combined stream with an average SiCl functionality greater than or equal to 2.8 in an aqueous medium at elevated temperature a granular gel is obtained in all cases. The combined stream can be formed by blending several different streams to obtain the desired average SiCl functionality. If the aqueous medium is concentrated hydrogen chloride, the hydrogen chloride generated in the hydrolysis step can be recovered.

Abstract: Acrylic functional siloxane polymer compositions which are especially useful for ultraviolet curable silicone release coating applications are provided as a reaction product of omega-chloro-1-alkenes, dialkylhydrogen chainstopped polydialkylalkylhydrogen siloxane copolymers, catalytic amounts of precious metal complexes and acrylic functional monomers.

Abstract: Described is a process for producing alkoxysilane cluster compounds by reacting a trialkoxysilanol with an amidated alkoxysilane cluster compound; this reaction being based on the following equation: ##STR1## wherein R is hydrogen, an alkyl, an alkenyl, an aryl, or an aralkyl; each R' is independently selected from the same groups as R with the proviso that at least a majority of said R' radicals are sterically hindered alkyl groups having at least 3 carbon atoms; and R" and R"' are individually selected from hydrogen, lower alkyl groups having 1-4 carbon atoms, and phenyl.

Abstract: Described is a process for producing alkoxysilane cluster compounds by reacting a trialkoxysilanol with a triamidosilane; this reaction being based on the following equation: ##STR1## wherein R is hydrogen, an alkyl, an alkenyl, an aryl, or an aralkyl; each R' is independently selected from the same groups as R with the proviso that at least a majority of said R' radicals are sterically hindered alkyl groups having at least 3 carbon atoms; and R" and R'" are individually selected from hydrogen, lower alkyl groups having 1-4 carbon atoms, and phenyl with the proviso that both R" and R'" may not be hydrogen.

Abstract: Copolymers of acrylic or methacrylic materials of known type and reacted with novel, silicone-substituted acrylic and methacrylic compounds so as to produce an oxygen-permeable plastic material which is uniquely suitable for manufacturing novel corneal contact lenses. The silicone materials include high molecular weight polysiloxanylalkylesters of acrylic and methacrylic acids, made from acrylic or methacrylic ester silanes containing one or more highly substituted siloxanyl groups.One such siloxane substituent, pentamethyldisiloxane, is prepared by a novel method. Certain of the substituted silanes are prepared using a novel compound, tris(trimethylsiloxy) acetoxysilane.

Abstract: Copolymeric organopolysiloxanes comprising SiO.sub.2 are prepared by forming an acidic, homogeneous mixture of a silanol-containing resinous copolymeric siloxane comprising R.sub.3 SiO.sub.1/2 siloxane units and SiO.sub.2 siloxane units, an organohydrogenpolysiloxane and an organic solvent and heating the resulting mixture to remove substantially all of the organic solvent. The copolymeric organosiloxanes contain silicon-bonded hydroxyl radicals and/or silicon-bonded hydrogen radicals in varying amounts which depends upon the acidity of the homogeneous mixture that is formed and the ratio of silicon-bonded hydrogen radicals to silicon-bonded hydroxyl radicals therein. The copolymeric organopolysiloxanes are useful as a reactive component in various types of curable silicone compositions.

Abstract: This invention is concerned with producing ethylene and/or 1,2-propylene glycol by the reaction of a non-cyclic oxymethylene compound formed by the hydration or acetalization of formaldehyde with a compound containing one or more of silicon, germanium and tin bonded therein which functions as an addend in a photochemically or thermally induced radical reaction, to form a 1,2-dioxyethylene containing compound, and cleaving such 1,2-dioxyethylene containing compound to form the glycol thereof.

Abstract: Siloxanes having units containing the grouping (XOQO) Si.tbd. in which X represents hydrogen or a chemical bond linking the adjacent oxygen atom to the silicon atom of a silyl or siloxy group and Q represents ##STR1## or--CH(C.sub.3 H.sub.7)CH(C.sub.2 H.sub.5)CH.sub.2 --They are prepared by reacting a siloxane with 2-butyl-2-ethylpropane-1,3-diol or 2-ethylhexane-1,3-diol and are useful for imparting insect repellent properties to surfaces.

Abstract: Novel compositions are described comprising silicone oils and silicate cluster compounds. The addition of the cluster compounds serves to enhance the silicone oils and accommodate the solubilizing of various additive materials that otherwise are not compatible with the silicones.

Abstract: A method for stabilizing organopolysiloxanes which are obtained from the condensation and/or equilibration of organosilicon compounds in the presence of phosphoronitrile chlorides which comprises treating the organopolysiloxanes with ammonia or an amine of the general formulaYHNC(CH.sub.3).sub.n (CH.sub.2 X).sub.3-nin which each X represents a hydrogen atom or a radical of the formulae --OCH.sub.3, --N(CH.sub.3).sub.2, --C(CH.sub.3).sub.3, --C(CH.sub.3).sub.2 NHY and --OC(CH.sub.3).sub.3 ; Y represents a hydrogen atom or a trimethylsilyl radical and n represents 0, 1, 2 or 3.

Abstract: A process for the preparation of a silane of the formulaR.sub.a SiH.sub.b (OR').sub.4-(a+b)whereinR is optionally substituted alkyl, alkenyl or aryl with up to 7 C atoms,R' is alkyl with 1 to 4 C atoms,a and b each independently is 1, 2 or 3, anda+b is at most 4,comprising reacting an Si-H polysiloxane with a compound of the formulaR.sub.a Si(OR').sub.4-ain the presence of a conventional redox-stable siloxane polymerization catalyst which favors the exchange reaction. Advantageously the catalyst is AlCl.sub.3 and R and R' are methyl, ethyl, vinyl or phenyl.

Abstract: An improved method is disclosed for the preparation of trialkoxysilanols. The process involves hydrolysis of corresponding trialkoxyhalosilanes with solid bicarbonate in the presence of a critical catalytic amount of water.