Abstract: The impact strength of certain thermoplastic vinylic polymers is improved by polymerizing the corresponding monomers in an emulsion of a diorganosiloxane containing units of the formula HSR'SiR.sub.n O.sub.3-n/2. For example a styrene acrylonitrile copolymer containing 20 percent by weight of a dimethylsiloxane-3-mercaptopropylsiloxane copolymer having 1 mol percent mercaptosiloxane has an Izod notched impact strength of 10.8 foot pounds per inch.

Abstract: Improvement in impact strength of certain vinylic polymers is obtained by dissolving a mercaptosiloxane-dimethylsiloxane copolymer in a vinylic monomer and converting the monomer to a polymer by bulk or suspension polymerization in the presence of a free radical generator. For example, a copolymer of mercaptopropylmethylsiloxane and dimethylsiloxane is dissolved in styrene and the styrene is copolymerized with acrylonitrile in bulk and/or in water suspension using benzoyl peroxide as a catalyst.

Abstract: Silylamine hydrochlorides are prepared by reacting a silane of the formula (RO).sub.n R'.sub.3-n SiR''Cl with at least two moles of an amine and thereafter volatilizing the amine to obtain a hydrochloride of the formula (RO).sub.n R'.sub.3-n SiR''NR'''.sub.2.HCl.

Abstract: Disilazanes having sulphur atoms attached to the silicon atoms through divalent aliphatic hydrocarbon radicals having from 2 to 6 carbon atoms. They are prepared by reacting a disilazane having olefinically unsaturated hydrocarbon radicals attached to the silicon atoms with a thiol, in the presence of a free radical generator. The disilazanes are useful as intermediates and for the treatment of particulate solids.

Abstract: Composition for application to keratinous fibres to impart resistance to shrinking. The composition comprises (A) a hydroxylated polydiorganosiloxane having a molecular weight of at least 750(B) an organosilane having alkoxy groups and an organic substituent containing at least 2 amine groups, and/or a partial hydrolysate and condensate of the organosilane, and (C) an organic or organosilicon compound containing at least one hydroxyl radical bonded to an aliphatic carbon atom.The composition may also contain a further organosilane e.g. methyltrimethoxysilane and/or its partial hydrolysis and condensation product.

Abstract: A catalyst carrier substance which can be obtained by reacting an inorganic particulate solid having surface hydroxyl groups with an organosilicon compound containing sulphur. The carrier may be converted to a supported catalyst by reaction with a compound or complex of platinum or rhodium. The catalysts can be recovered and recycled and are useful in hydrogenation, hydroformylation and oligomerization reactions. They are of particular interest with respect to hydrosilylation reactions.

Abstract: Process for preparing an organosilicon product by the reaction of a silicon compound having SiH groups with an organic or organosilicon compound having aliphatic unsaturation in the molecule. The process is carried out in the presence of, as catalyst, a compound or complex of platinum or rhodium and also in the presence of a cobalt salt of a monocarboxylic acid. The cobalt salt improves the catalytic performance of the compound or complex of platinum or rhodium.

Abstract: Polymers which are flexible down to -40.degree.F. and which do not depolymerize appreciably when heated in a closed space at 500.degree. F. or above have the structure ##EQU1## These polymers can be cured to rubbers which are solvent resistant and are flexible over a wide temperature range. Such rubbers are useful for sealing aircraft fuel tanks.

Abstract: Method for imparting resilience and crease resistance to synthetic fibers, particularly knitted fabrics, by applying to the fibers a composition obtained by mixing a hydroxylated polydiorganosiloxane, an organosilane having amino and alkoxy or alkoxyalkoxy groups in the molecule and an organosilane having alkoxy or alkoxyalkoxy groups and hydrogen atoms, monovalent hydrocarbon or halogenated hydrocarbon groups in the molecule. Partial hydrolysates of the silanes may optionally be used. The applied composition is then cured at normal or elevated temperatures.

Abstract: Process for coating a surface with an organosiloxane composition to render it non-adherent. The organosiloxane composition is substantialy solvent-free, has a viscosity not exceeding 4,000 cS at 25.degree.C and comprises (1) a polydiorganosiloxane having silicon-bonded vinyl radicals (2) an organohydrogenpolysiloxane and (3) a catalyst which isRhX.sub.3 (SR.sub.2).sub.3orRh.sub.2 (CO).sub.4 X.sub.2in which X is halogen, preferably chlorine, and each R is alkyl, aryl, aralkyl, alkaryl or R'.sub.3 SiQ wherein Q is a divalent aliphatic hydrocarbon radical and R' is alkyl, aryl, aralkyl or alkaryl or (CH.sub.3).sub.3 Si-. After application the composition is cured.

Abstract: Anionic silanes of the formula ##EQU1## are made by reacting silanes of the formula (RO).sub.3 SiR'(NHCH.sub.2 CH.sub.2).sub.n NHCH.sub.2 ##EQU2## with 1 or 2 moles of an anhydride of a 1,2-dicarboxylic acid. A typical compound is ##EQU3## these compounds are used as coupling agents between inorganic substrates and organic resins such as epoxides, phenolic and polyester.

Abstract: Stereoisomers of cycloorganosiloxanes are interconverted without siloxane bond redistribution by reacting the cyclic siloxane with anhydrous zinc chloride, zinc bromide, ferric chloride, aluminum chloride or aryl phosphonium chlorides in the presence of nitro compounds or aryl phosphate esters as solvents. A typical example is the conversion of 2,6-trans-diphenylhexamethylcyclotetrasiloxane to the 2,6-cis-isomer by heating in 2-nitropropane solvent in the presence of anhydrous zinc chloride.

Abstract: Organosilicon resins having excellent thermal shock resistance in either the filled or unfilled state are obtained by curing mixtures of (A) a copolymer of (in mole percent) 35 to 42 monophenylsiloxane, 0 to 12 diphenylsiloxane, 35 to 50 dimethylsiloxane and 8 to 15 vinylmethylsiloxane with (B) a copolymer of (in mole percent) 8 to 15 diphenylsiloxane, 30 to 55 methylhydrogensiloxane, 28 to 45 dimethylsiloxane and 5 to 12 trimethylsiloxane in amount such that there is a stoichiometric amount of SiH and Si vinyl .+-. 10 percent of either ingredient. The preferred fillers are mixtures of 1/32 to 1/8 inch glass fibers and 2 to 8 microns crystalline silica.

Abstract: Method for bonding a room temperature vulcanisable silicone rubber to a porous substrate of masonry or wood. The method involves applying to the porous substrate a primer composition comprising a cyclised rubber resin, an organic solvent and a film-forming polyester resin in a proportion of from 0 to 40% by weight based on the weight of cyclised rubber resin. The primed surface is dried and a room temperature vulcanisable silicone rubber composition of specified type then applied.