Abstract: A method for molding high water, high resiliency (HR) polyurethane foam articles is disclosed wherein a silicone mold release composition is used to treat the surfaces of a mold. The composition imparts release characteristics to the mold which last through multiple molding cycles, allow recoating with said composition and allows the production of defect-free foam articles. The composition consists essentially of a high and a low molecular weight hydroxyl endblocked polydimethylsiloxane, a siloxane crosslinker having SiH functionality, a catalyst and an inert solvent.

Abstract: Fine spherical particles of cured silicone elastomer can be prepared by spray-drying an aqueous emulsion of a curable organopolysiloxane composition having a particle diameter not exceeding 20 .mu.m. The organopolysiloxane composition comprises preferably an organopolysiloxane having silicon-bonded vinyl groups, an organohydrogenpolysiloxane having silicon-bonded hydrogen atoms and a platinum catalyst so that curing of the composition may take place in the emulsion before spray-drying or in the course of spray-drying by the addition reaction between the silicon-bonded vinyl groups and the silicon-bonded hydrogen atoms.

Abstract: The tear strength of cured organosiloxane elastomers can be increased without adversely affecting other physical properties if the composition used to prepare the elastomer is curable by a platinum-catalyzed hydrosilation reaction and contains a mixture of two liquid diorganovinylsiloxy terminated polydiorganosiloxanes, one of which constitutes from 70 to 95 percent by weight of said mixture and contains vinyl or other ethylenically unsaturated hydrocarbon radicals only at the terminal positions. The second polydiorganosiloxane contains both terminal vinyl radicals and from 1 to 5 mole percent of vinyl radicals on non-terminal repeating units.

Abstract: Ethoxylated siloxane surfactants, and mixtures of such surfactants with curable silicone prepolymers. The mixtures are hydrophilic after cure, have semipermanent hydrophilicity, and are especially useful as dental impressions.

Abstract: Cohesive bonding between silicone rubber compositions and plastics is achieved using primer compositions comprising a solution of at least one member of a specified class of organotitanate esters in an organic liquid. Cohesive bonding of silicone rubber compositions to both plastic and metals is achieved by including at least one member from either of two specified classes of organosilicon compounds in the primer composition together with the organotitanate ester.

Abstract: Powdered, cured silicone rubber in the form of microfine particles is prepared by emulsifying a curable liquid silicone rubber composition in a mixture of water and a surfactant at a temperature of from 0 to 25 degrees C., dispersing the curable composition in water heated to a temperature of at least 25 degrees C. and recovering the resultant cured particles. The liquid silicone rubber composition is preferably maintained at a temperature of from -60 to 0 degrees C. before being emulsified.

Abstract: The essential components in the inventive room temperature-curable organopolysiloxane composition are: (A-1) a diorganopolysiloxane of which each terminal silicon atom has a silanolic hydroxy group or two alkoxy groups; (A-2) a filler; (A-3) an alkenyloxy silane, e.g. methyl tri)isopropenyloxy)silane; (A-4) a guanidino-containing organosilicon compound, e.g. 3-(tetramethylguanidino)propyl trimethoxy silane; (A-5) an alcohol, e.g. methyl or ethyl alcohol; (B) an organosilicon compound having a silicon-bonded hydrogen atom; and (C) an organic tin compound as a catalyst. By virtue of the unique formulation above, the composition is very stable in storage in a moisture-free condition for a long period of time without losing the high curability when exposed to a moisture-containing atmosphere.

Abstract: Disclosed are essentially zinc-free, organic coating compositions based on silicon-containing polyols comprising reaction products of hydrophobic polyols, organosilicon-containing materials, and higher monohydric alcohols, R-OH. The organosilicon-containing material comprises an organosilicon-containing substance free of certain functional groups attached directly to carbon and essentially free of alkali metal ions. The organosilicon-containing substance has atoms bonded directly to Si all of which are selected from O, N, and/or Cl. The organosilicon-containing substance also has moieties directly bonded to Si which are displaceable by reaction with water and/or alcohol. The reaction product is not capable of being gelled when subjected to a specific gel test, has a content of hydroxyl groups from the hydrophobic polyol ranging from 0.4 to 10 milliequivalents per gram of reaction product, has a content of groups, --OR, from the higher monofunctional alcohol ranging from 0.

Abstract: The curable compositions of this invention comprise a solubilized vinyl-containing fluorosilicone gum, a curing agent for the gum, a platinum-containing hydrosilation catalyst, a treated reinforcing silica filler, and a volatile solvent for the gum and curing agent. The organosilicon compound used to treat the silica filler is critical to obtaining a homogeneous curable composition free of agglomerated particles, and is a hydroxyl terminated polydiorganosiloxane containing silicon-bonded fluorocarbon radicals.

Abstract: Addition curable organopolysiloxane compositions are blended and cured within specified temperature ranges to obtain cured articles that are free of bubbles and exhibit a smooth, glossy exterior surface.

Abstract: A method for impregnating organic fibers which comprises applying a composition containing (1) an organopolysiloxane having silicon-bonded condensable groups and containing diorganosiloxane units in which the two SiC-bonded organic radicals are monovalent hydrocarbon radicals and also contains two monovalent SiC-bonded radicals having a basic nitrogen group; (2) an organopolysiloxane having at least 3 Si-bonded hydrogen atoms per molecule; and (3) a catalyst which promotes the condensation of the silicon-bonded condensable groups, in which the SiC-bonded radicals having a basic nitrogen group are present in the organopolysiloxane (1) as monoorganosiloxane units and as diorganosiloxane units.

Abstract: A composition which provides excellent corrosion protection to metals, particularly ferrous metals which are to be exposed to moisture and/or salt, is disclosed. The composition comprises (I) a reaction product (or blend) of a resinous copolymeric siloxane solution with a liquid organohydrogenpolysiloxane, (II) a hydroxy-functional diorganopolysiloxane and (III) an organosilane. The composition may be cured on metal surfaces, either at room temperature or at elevated temperature, to provide a strongly adhering corrosion protective coating.

Abstract: Novel platinum/olefin complexes, useful for the hydrosilylation curing catalysis of hardenable organopolysiloxane compositions, are facilely prepared by reacting a platinum halide with at least one alkali or alkaline earth metal carbonate or bicarbonate in the presence of an alkenylcyclohexene ligand having the general formula: ##STR1## wherein R.sub.1 is an alkenyl radical having from 2 to 6 carbon atoms, and R.sub.2 is a hydrogen atom or an inert organic radical, and said complex having a ratio, in gram-atoms of halogen to gram-atoms of platinum, ranging from virtually 0 to 4.

Abstract: Polyorganosiloxane compositions comprising:(A) a linear and/or branched polyorganosiloxane, with a viscosity of 50 to 100,000 cP at 25.degree. C., wherein 0.7 to 1.8 vinyl radicals bonded to silicon atoms, on average, are present in each molecule, and the remaining organic radicals bonded to silicon atoms are substituted or unsubstituted monovalent hydrocarbon radicals which does not include unsaturated aliphatic radicals, and 30% or more portion of the molecules has only one silicon-bonded vinyl radical in the molecule;(B) a polyorganohydrogensiloxane, wherein more than two hydrogen atoms bonded to silicon atoms, on average, are present in each molecule, in an amount such that the number of silicon-bonded hydrogen atoms may be 0.5 to 5 per vinyl radical in the molecule (A);(C) a catalytic amount of platinum compounds; and(D) anthraquinone dyes and/or azo dyes, in an amount from 1 to 2,000 ppm to (A).

Abstract: The inventive foamable silicone rubber composition comprises (a) a silanolic hydroxy-terminated diorganopolysiloxane, (b) a vinylsilyl-terminated diorganopolysiloxane, (c) an organohydrogenpolysiloxane as a crosslinking agent of the diorganopolysiloxanes, (d) a filler, (e) a platinum compound as a catalyst, (f) aluminum hydroxide and (g) red phosphorus. The components (f) and (g) each serve as a fire-resistance improver to synergistically impart the cured foamed silicone rubber with greatly improved resistance against fire when it is exposed to flame.

Abstract: This invention provides self-adhering polyorganosiloxane compositions that cure by a platinum-catalyzed hydrosilation reaction. The compositions include as the adhesion promoter a polysiloxane comprising diorganohydrogensiloxy, alkoxy and SiO.sub.4/2 units.

Abstract: A curable silicone composition comprising (A) an organosilicon compound having at least two radicals of the formula: ViSi(R.sup.1).sub.2 Si(R.sup.1).sub.2 --Z-- wherein R.sup.1 is a lower alkyl radical and Z is a bivalent radical of --O-- or --CH.sub.2).sub.n in which n is an integer of 1 to 3, (B) a platinum catalyst, and optionally (C) an organosilicon compound having silicon bonded vinyl groups. The composition is cured through a new crosslinking mechanism without any byproducts, and has high stability at normal temperatures and good curability.

Abstract: Organopolysiloxane compositions adopted for easy conversion into burn resistant foams useful, e.g., for the protection of nuclear power installations, include admixture of various organopolysiloxane polymers comprising SiH, SiOH, SiR.sub.3 and Si-vinyl functions, and notably a hydroxylated liquid resin containing CH.sub.3 SiO.sub.1.5 and (CH.sub.3).sub.2 SiO units, or reaction product of a hydroxylated MQ resin with a hydroxylated polyorganosiloxane oil, or mixture thereof.

Abstract: A simplified method of manufacture for platinum (O) alkyne complexes is disclosed, as well as novel platinum (O) alkyne complexes per se. The complexes are made by reacting platinum-vinylsiloxane complexes with alkynes. The complexes are used in hydrosilylation, hydrogenation, isomerization and oligomerization reactions. Curable silicones using these platinum (O) alkyne complexes as curing catalysts are also disclosed.

Abstract: Storage-stable, aqueous polysiloxane emulsions well adopted as coating compositions to impart anti-adhesiveness/water-repellency to a wide variety of substrates, e.g., paper, are comprised of an anti-adhesive/water-repellency effective amount of (A) diorganopolysiloxane oil having the formula:HO(SiR.sub.2 O).sub.n Hwherein the symbols R, which may be identical or different, are each an alkyl radical containing from 1 to 3 carbon atoms, the 3,3,3-tri-fluoropropyl radical, or the vinyl radical, at least 50% of the radicals R being methyl radicals and at most 5% vinyl radicals, and the symbol n is any number, the value of which is such that the viscosity of the oil ranges from 500 to 50,000 mPa.s at 25.degree. C.; (B) an organopolysiloxane resin comprising recurring units selected from among those of the formulae R'SiO.sub.1.5, R'.sub.2 SiO and R'.sub.3 SiO.sub.0.

Abstract: The present invention relates to the use of paraffin waxes or microwaxes in silicone pastes, in particular in kneadable compositions for the production of accurate impressions of teeth. The silicone pastes are preferably cold-vulcanizing two-component silicone rubber systems which are known per se and in which two pastes are mixed and then crosslink after about 2-5 minutes at room temperature.

Abstract: A paste composition which is used in the preparation of dental impression compositions containing:(a) at least 100 ppm by weight, based on the weight of the paste composition of platinum calculated as the element;(b) 35 to 75 percent by weight, based on the weight of the paste composition, of a diorganopolysiloxane which contains at least 2 SiC-bonded vinyl groups per molecule and has a viscosity of at least 100 mPa.s at 25.degree. C.;(c) 10 to 25 percent by weight, based on the weight of the paste composition, of a hydrocarbon which is liquid or spreadable at room temperature and is free of aliphatic carbon-carbon multiple bonds; and(d) 3 to 15 percent by weight, based on the weight of the paste composition, of hydrophobic silicon dioxide having a surface area of at least 50 m.sup.2 /g;in which the sum of the percentages of (a) to (d) including other additives which may be present in the paste composition is equal to 100 percent.

Abstract: The present invention is directed to aqueous dispersion compositions in the form of aqueous, spreadable coating or printing pastes, characterized in that they contain(A) aqueous dispersions of polyurethanes (Aa) or mixtures of polyurethanes (Aa) and aqueous dispersions of poly(meth)acrylates (Ab),(B) carboxyl group-containing, aqueous thickener polymer solutions,(C) self-crosslinking polyorganosiloxane mixture and(D) crosslinking agents for the polyurethanes, for the carboxyl group-containing thickener polymers (B) and, optionally, for the poly(meth)acrylates.The present invention is also directed to a process for the preparation of these aqueous dispersion compositions and to their use for coating or printing substrates.

Abstract: There is disclosed a room temperature curing silicone for protecting polyurethane foam. The silicone coating provides protection from ultraviolet light, water penetration, and mechanical damage. The silicone coating comprises a particular organosilicon resin, an hydroxy-ended silicone polymer, fillers, and an organotin catalyst.

Abstract: A silicone composition which is stable in the absence of moisture but which in the presence of water will cure at room temperature to an elastomer, comprising a polyorganosiloxane having reactive end groups, a polyester and a thickening filler.

Abstract: The present invention provides a releasable film forming composition comprising (1) an organopolysiloxane having hydroxyl groups at the ends of the molecular chain, (2) a finely divided silica, (3) a phenyl-containing organosilane or organopolysiloxane, (4) an organohydrogenpolysiloxane containing at least three SiH groups per molecule, (5) a metallic salt of an organic acid and (6) an organic solvent, and a process for preparing same, as well as a releasable film forming composition comprising (1) an organopolysiloxane containing at least two silicon atom-bonded alkenyl groups per molecule, (2) a finely divided silica, (3) a phenyl-containing organosilane or organopolysiloxane, (4) an organohydrogenpolysiloxane containing at least two SiH groups per molecule, (5) a platinic compound and (6) an organic solvent, and a process for preparing same. These compositions exhibit a superior printability and a stable releasability from adhesive materials and are less slippery.

Abstract: A room temperature vulcanizable silicone composition free of plasticizing fluid and curable to a low modulus silicone rubber upon exposure to moisture, comprising:(A) 100 parts by weight of an organopolysiloxane wherein the silicon atoms at the polymer chain ends are terminated with at least two alkoxy radicals, said organopolysiloxane having a viscosity ranging from about 20,000 centipoise to about 500,000 centipoise at 25.degree. C.;(B) up to 100 parts by weight filler per 100 parts by weight of organopolysiloxane, there being present at least 5 parts by weight of reinforcing filler, or 20 parts by weight of extending filler, or mixture thereof;(C) from 0.05 to 5 parts by weight of an adhesion promoter per 100 parts by weight of organopolysiloxane; and(D) an effective amount of condensation catalyst.

Abstract: There is provided a room temperature vulcanizable silicone composition comprising a polyalkoxy-terminated polydiorganosiloxane and a difunctional nitrogen-containing silane. Processes for making such room temperature vulcanizable compositions are also provided.

Abstract: Novel zero valent nickel complex catalysts have been developed for hydrosilation reactions including the use of such zero valent nickel complexes as catalysts in place of platinum complexes for SiH olefin compositions to produce silicone elastomers. These zero valent nickel complex catalysts appear to be most effective under anaerobic conditions.

Abstract: Silicone elastomers having thermally conductive properties which comprise an organopolysiloxane having Si-bonded aliphatically unsaturated groups, an organohydrogenpolysiloxane having Si-bonded hydrogen atoms, a catalyst capable of promoting the addition of Si-bonded hydrogen to Si-bonded aliphatically unsaturated groups and from about 30 to 95 percent by weight of filler, based on the weight of the composition, of which at least 10 percent by weight of the filler is silicon nitride particles.

Abstract: Silicone compositions are disclosed which comprise a liquid silicone resin, a vinyl-containing silicone resin, a siloxane polymer, and a hydrosilylation catalyst. The compositions cure to give unusually strong, fuel resistant coatings and elastomers.

Abstract: The present invention provides a releasable film forming composition comprising (1) an organopolysiloxane having hydroxyl groups at the ends of the molecular chain, (2) a finely divided silica, (3) a phenyl-containing organosilane or organopolysiloxane, (4) an organohydrogenpolysiloxane containing at least three SiH groups per molecule, (5) a metallic salt of an organic acid and (6) an organic solvent, and a process for preparing same, as well as a releasable film forming composition comprising (1) an organopolysiloxane containing at least two silicon atom-bonded alkenyl groups per molecule, (2) a finely divided silica, (3) a phenyl-containing organosilane or organopolysiloxane, (4) an organohydrogenpolysiloxane containing at least two SiH groups per molecule, (5) a platinic compound and (6) an organic solvent, and a process for preparing same. These compositions exhibit a superior printability and a stable releasability from adhesive materials and are less slippery.

Abstract: Addition curable silicone release compositions comprised of a vinyl-functional base polymer, a cross-linking agent, a precious metal catalyst, and an effective amount of C.sub.4 -C.sub.30 .alpha.-olefins are provided which allow reduction in the amount of catalyst or allow the use of vinyl-containing polymers having a lower degree of functionality. The compatibility of the .alpha.-olefin additives allows the preparation of a wide range of serviceable release coating compositions at reduced cost and improved efficiency.

Abstract: Polyorganosiloxane foams exhibiting a desirable combination of low density, an average cell size between 0.2 and 4 mm and a cell concentration of at least 4 per linear centimeter are obtained by dispensing and curing moisture curable organosiloxane compositions containing a dispersed liquid or gaseous blowing agent and, as a foam stabilizer, a resinous organosiloxane copolymer comprising trimethylsiloxy units, SiO.sub.4/2 units and fluorine-containing organosiloxane units. The polymer portion of the organosiloxane compositions can be a polydimethylsiloxane or a graft copolymer comprising at least 20 mole percent of dimethylsiloxane units in combination with organic units.

Abstract: There is provided a one package silicone RTV composition which is convertible to a tack-free elastomer, comprising:(A) a polydiorganosiloxane base polymer,(B) an effective amount of condensation catalyst,(C) a stabilizing amount of scavenger for hydroxy functional groups wherein said scavenger contains at least one silicon-bonded hydrogen;(D) optionally, a crosslinking silane;(E) optionally, a cure accelerator; and(F) optionally, a scavenger for hydrogen gas.

Abstract: A composition curable at room temperature has resistance to soiling and maintains its adhesion to substrates when cured. The composition is the product obtained by mixing a polyorganosiloxane having at least two silicon-bonded hydroxyl radicals or two silicon-bonded hydrolyzable groups per molecule, a crosslinking organosilicon compound containing at least two silicon-bonded hydrolyzable groups, and an organosulfonate-containing silicon compound.

Abstract: Improved inhibitor systems are disclosed for the reaction of silicon hydride containing silicones with vinyl containing and/or hydroxyl containing silicones. The improved inhibitors are mixtures of conjugated ene-ynes and vinylcyclosiloxanes. Inhibition of cure at room temperature is combined with rapid cure at elevated temperature when the improved inhibitors are used.

Abstract: The present invention provides a method for preparing a precious metal catalyzed, heat curable silicon release coating composition. Also, there is provided an article of manufacture for packaging the ingredients necessary to practice the method of the invention.

Abstract: A method of polymerizing hydroxyl-endblocked polydiorganosiloxane in the presence of filler, including acidic filler such as fumed silica, through the use of basic diorganosilanolates as catalysts is claimed. Preferred diorganosilanolates are tetra-n-butylphosphonium dimethylsilanolate and potassium dimethylsilanolate. The silicone polymer-filler mixture produced is useful in silicone greases and elastomers. Methods of combining the silicone polymer-filler mixture with various curing agents to yield curable compositions are claimed.

Abstract: A process for coating a substrate which comprises applying to the substrate an aqueous emulsion containing:(1) A diorganopolysiloxane having terminal SiC-bonded vinyl groups;(2) An organopolysiloxane containing at least three Si-bonded hydrogen atoms per molecule;(3) A catalyst which promotes the addition of Si-bonded hydrogen to an aliphatic multiple bond; and if desired,(4) An agent which delays or retards the addition at room temperature; and(5) A thickening agent, which may be mixed with or added separately to the emulsion, and prior to cross-linking the organopolysiloxane, applying separately or together with one or more of the constituents (1) through (5);(6) A vinyl-containing trimethylsiloxy end-blocked diorganopolysiloxane in which the vinyl group is bonded to from 10 to 50 percent of the number of the silicon atoms of the diorganopolysiloxane units, and the other organic radicals are free of aliphatic multiple bonds;(7) An organosilicon adhesive compound; and(8) At least one aqueous dispersion of a

Abstract: Fiber-treating compositions are described which durably provide water repellency and oil repellency for the treated fiber. These compositions comprise a siloxane component bearing fluorinated hydrocarbon radicals, unsubstituted hydrocarbon radicals and silicon-hydride atoms, and a dehydrogenation condensation catalyst. Curing of the compositions occurs by a dehydrogenation condensation reaction between the silicon-hydride atoms and/or between the silicon-hydride atoms and the hydroxyl radical of an optionally added hydroxyl-endblocked organopolysiloxanes.

Abstract: Provided is a coating material for optical communication glass fibers comprising a vinyl group terminated methylphenylpolysiloxane, a methylhydrogenpolysiloxane or a methylphenylhydrogenpolysiloxane, and a platinum catalyst. This coating material is superior in coating work efficiency onto optical communication glass fibers, cures quickly and can afford an optical communication glass fiber of high quality having a closely adhered cured film rich in flexibility and uniformity.

Abstract: There is disclosed a compositon forming an elastic foam at normal temperature essentially comprising(A) polydiorganosiloxane end-blocked by silanol group and a viscosity within the range between 500 and 200,000 cSt at 25.degree. C.,(B) an aminoxy group-containing organosilicon compound having more than two silicon-bonded organoaminoxy groups on the average in one molecule,(C) a silicon-hydrogen bond containing polyorganosiloxane having more than two silicon-hydrogen bonds on the average in one molecule, with the proportion of said silicon-hydrogen bonds being 10% or more of the number of silicon atoms,(D) fumed silica,(E) an isocyanato group-containing organic compound, and optionally(F) a polyhydric alcohol having two or more alcoholic hydroxyl groups bonded to primary carbon atoms and/or two or more alcoholic hydroxyl groups bonded to secondary carbon atoms in one molecule.

Abstract: The present invention provides a method for preparing a precious metal catalyzed, heat curable silicon release coating composition. Also, there is provided an article of manufacture for packaging the ingredients necessary to practice the method of the invention.