Abstract: Disclosed is an electroconductive silicone composition, which contains an acetylene black having an HCl-absorption of 12 ml/5 g or less and an I-adsorption of 50 mg/g or less and which has improved workability. The composition may further contain a magnesium carbonate, a silicone oil and/or a carbon black having a mean grain size of 200 m.mu. or more and a specific surface area of 15 m.sup.2 /g or less. The it composition has improved reproducibility and temperature-dependent stability with respect to the electroconductivity as well as improved fire-resistance.Also disclosed is a silicone ink comprising (A) an addition-curable polyorganosiloxane, (B) a carbon black having an I-adsorption of 50 mg/g or less, a mean grain size of 35 m.mu. or more and a DBP adsorption of 150 ml/100 g or more, and (C) a solvent. The ink has improved storage stability.

Abstract: In a heat curable silicone rubber composition comprising a polydiorganosiloxane base polymer and a curing catalyst, the improvement comprising an effective amount of co-curing agent. Preferably, the co-curing agent has the general formula ##STR1## where R is H or a C.sub.1-5 alkyl radical, R.sup.1 is a C.sub.1-5 alkylene radical, each R.sup.2 is independently selected from H and CH.sub.3, R.sup.3 is H or CH.sub.3, n equals 0 or 1, and m is an integer from 3 to 6, inclusive.

Abstract: Novel polysiloxane polymers are provided having general formula(CH.sub.3).sub.3 SI--O--(CH.sub.3).sub.2 SiO].sub.x [(CH.sub.3)R.sup.1 O].sub.y Si(CH.sub.3).sub.3wherein R.sup.1 is a polyoxyalkylene radical of the formula ##STR1## x has an average value from about 5 to 400, y has an average value of at least 1 and n has an average value from at least 1 to 200. Water-in-oil emulsions comprising the novel polysiloxane polymers are also described.

Abstract: A two-component room temperature vulcanizable polysiloxane composition curable in the presence of a heat-activated catalyst is disclosed. The working life of a condensation curable organopolysiloxane containing terminal silicon-bonded hydroxy groups in a first component is extended by using a metallic salt of an organic carboxylic acid catalyst in a second component by providing in combination with the metallic salt of an organic carboxylic acid catalyst, a solid, inert barrier material capable of melting at an elevated temperature, whereby the catalyst is activated when heat applied thereto, melts the solid barrier material. A cross-linking agent and optionally, a filler, are used in the components. In one embodiment, the catalyst is a tin carboxylate used as a core material and the solid, inert barrier material is calcium stearate used as a wall material to encapsulate the catalyst material.

Abstract: A method of protecting silver contacts in switches for electronic equipment is provided by utilizing a silicone-based grease which is comprised of a polyorganosiloxane base in combination with a thickener such as finely divided silica or a metal soap and an organomercaptan compound represented by R.sup.2 SH wherein R.sup.2 represents a saturated or unsaturated aliphatic hydrocarbon group having 18 to 22 carbon atoms. There may also be optionally included an ester bond-containing organic compound for improved properties when the treated silver contacts have relatively high contact pressure.

Abstract: There is provided flame retardant thermoplastic compositions and masterbatch formulations effective for rendering thermoplastics flame retardant. A typical flame retardant composition could be comprised of 50 to 97 percent by weight of thermoplastic, 1 to 40 percent of a silicone base such as a linear silicone fluid or gum, 1 to 20 percent of a metal organic compound such as magnesium stearate, and 1 to 20 percent of a silicone resin such as MQ resin which is soluble in the silicone base.

Abstract: A SiH-olefin platinum catalyzed composition having a Durometer Hardness of at least 60 where the novel ingredients are a combination of 10 to 50 parts by weight of fumed silica and 5 to 50 parts by weight of calcined diatomaceous earth per 100 parts of the base vinyl-containing compound. Such a composition is useful for forming molded parts in liquid injection molding machines, both of the plunger type and of the reciprocating screw type.

Abstract: A self-bonding additive for a dimedone functional one-component RTV in which the self-bonding agent is a dialkoxydisilylether functional silane.

Abstract: Process for preparing platinum catalyzed SiH-olefin silicone compositions using hydroperoxy-containing inhibitors.

Abstract: The foaming of resinous insulating materials under vacuum is substantially reduced by adding to the material a polydiene having primarily vinyl unsaturation.

Abstract: A hand-operated apparatus for applying a gasketing composition on a part comprising the improvement where there are template means, with a track means beneath the base on which the part is located in which in the track means there moves a roller means which is connected to a movable arm means to which said movable means there is also connected dispensing mean for dispensing the gasketing composition. With such means, the amount of composition that is applied to the part to form a gasket as well as the path of the travel of the dispensing means as well as the height of the dispensing means from the part so as to determine the thickness of the gasket is fixed by the machine, the operator only guiding the starting, the stopping, and the dispensing of the composition.

Abstract: A paintable one-component room temperature vulcanizable silicone rubber composition comprising a silanol end-stopped polymer; as the basic filler, calcium carbonate; as a cross-linking agent, an acyloxy functional silane wherein the acyloxy group has from 2 to 30 carbon atoms, and a tin salt of a carboxylic acid as the curing catalyst.

Abstract: The present invention relates to a variety of silicone diffusion pump fluids which are inexpensive to produce. An example of a preferred diffusion pump fluid of the present case is one of the formula, ##STR1## where .phi. is phenyl and such that the fluid boils at 245.degree. C. at 1.5 mm. of Hg pressure. The present invention also has within its scope a process for producing such silicone diffusion pump fluids by hydrolyzing the appropriate chlorosilanes by a reverse hydrolysis procedure, that is, adding the appropriate amount of water to the mixture of chlorosilanes.

Abstract: The present invention provides curable organopolysiloxane compositions having improved flame retardant properties, comprising, (1) an organopolysiloxane gum convertible to the cured, solid, elastic state and consisting essentially of silicon atoms, oxygen atoms and organic groups selected from the class consisting of methyl radicals, aromatic radicals selected from the class consisting of aryl and halogenated aryl radicals, vinyl radicals, lower alkyl radicals, lower cyanoalkyl radicals and lower haloalkyl radicals, (2) a finely divided inorganic filler, (3) a platinum compound or platinum and (4) and various effective amounts of hydrated alumina, fumed titanium dioxide, and magnesium oxide.

Abstract: A method for producing silanol chain-stopped fluoroalkyl polysiloxane fluids is disclosed. Fluoroalkyl substituted cyclic trisiloxanes are reacted with water, a catalyst and a polyethyleneglycol ether promoter to produce a fluorosilicone polymer of the desired molecular weight and viscosity.

Abstract: An apparatus for stripping continuously a solid mass in a strip from a two roll mill comprising a frame; knife means at a first end of said frame adapted to cut a strip of solid mss from said two roll mill; first roller means adapted to receive the cut strip and pass it through a dusting means which applies a non-stick powder on said cut strip. Second roller means in said dusting means adapted to pass said dusted cut strip through such dusting means into a packaging container. There is also envisioned a novel means for fixing the distance of the knife means from the two roll mill with precision.

Abstract: A process for treating certain particles of less than 40 microns average diameter size in a silicone reactor where methyl chloride is reacted with particles of silicon in the presence of copper to produce chlorosilanes comprising removing particles of less than 40 microns average diameter size; and abraiding said particles to remove the surface coating; and returning said particles to the reactor.

Abstract: Epoxy functional diorganosiloxane fluids are combined with bis-aryl iodonium salts, particularly linear alkylate bis-dodecylphenyl iodonium salts to form a silicone coating composition effective for rendering surfaces non-adherent to other surfaces which would normally adhere thereto, and which will cure to a final non-adherent state upon brief exposure to ultraviolet radiation. Adhesion of the silicone coating to a substrate can be improved with the addition of .beta.-(3,4-epoxycyclohexyl)ethyltrimethoxy silane.

Abstract: A process for producing diorganopolysiloxane gums having a viscosity from 1,000 to 100,000,000 centipoise at 25.degree. C., where at least one of the organo substituent groups on the silicon atoms is an aliphatic radical of more than three carbon atoms comprising reacting a cyclic tetrasiloxane or a mixture of cyclic tetrasiloxanes at a temperature in the range of 0.degree. to 90.degree. C. and in the presence of 5 to 300 parts per million of a catalyst selected from the class consisting of cesium hydroxide and ##STR1## where R.sup.2 is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 4 to 8 carbon atoms and phenyl, B is selected from the class consisting of nitrogen and phosphorous, R.sup.3 is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 4 to 8 carbon atoms, phenyl, siloxane chains of the unit formula R.sub.a.sup.4 SiO.sub.(4-a/2) and mixtures thereof, where R.sup.

Abstract: New and useful polymers are prepared by reacting olefin-terminated prepolymeric materials with simple polyamine, by reacting simple olefins with amine-terminated prepolymers and by reacting olefin-terminated prepolymers with amine-terminated prepolymers. The new and useful polymeric materials so obtained can be cured as with heat, with or without catalyst, to provide products useful for preparing films, laminates, composites, prepregs, molding materials, varnishes, wire enamels and the like.