Abstract: The present invention relates to acetoxy, ketoximo, and alkoxy silicone sealants suitable for use in various sealant applications and additionally food contact applications comprising di-iodomethyl-para-tolylsulfone and having physical properties improved thereby.

Abstract: Hard surfaces are polished by applying an abrasive free, preferably clear, composition formed from an aqueous phase and a silicone phase. The aqueous phase contains water and a water soluble hydrophilic organic solvent. The silicone phase contains a volatile methyl siloxane, a siloxane polyether, and an organosilicon resin.

Abstract: An organopolysiloxane composition contains (A) a both end hydroxyl-blocked diorganopolysiloxane, (B) an inert diorganopolysiloxane, (C) a silane or siloxane having at least three hydrolyzable functional groups, (D) an organosilane having at least two alkoxy groups each attached to a silicon atom and one mercapto group separated from a silicon atom by an alkylene group or a partial hydrolyzate thereof, (E) an organosilane having at least two alkoxy groups each attached to a silicon atom and one amino group separated from a silicon atom by an alkylene group or a partial hydrolyzate thereof, (F) a condensation catalyst, and (G) a fine powder, typically of polycarbonate, having a mean particle size of 0.1-50 .mu.m. The composition is useful as a surface treating agent for cured rubber moldings for imparting non-tackiness, water repellency and lubricity to the rubber surface and forming a long-lasting abrasion resistant coating.

Abstract: The present invention relates to an organopolysiloxane emulsion composition comprising a hydroxy or alkoxy-endblocked diorganopolysiloxane, an alkoxy-group containing organosilicon compound, surfactant, and water. The compositions of this invention are characterized by a lack of offensive odor, high productivity and good storage stability. The organopolysiloxane emulsions of this invention are useful as fiber treatment agents. The fibers treated with the organopolysiloxane emulsion of this invention exhibit good feel.

Abstract: Aqueous microemulsions of protonated aminopolysiloxanes (.alpha.) comprising an amphoteric surfactant (.beta.) and optionally at least one non-ionic emulsifier (.gamma.) and optionally hydrotropics (.delta.) and/or cationic emulsifiers (.eta.) and the pH of which is .ltoreq.7 are suitable as finishing agents of good stability, in particular stability to shearing forces, for the treatment of fibrous material, in particular textile material.

Abstract: A room temperature curable rubber composition of a condensation curing type that comprises as a base polymer a diorganopolysiloxane or a polyoxyalkylene in which both ends of the molecular chain are blocked with a hydrolyzable silyl group, and a carbonyl compound, an amino group containing organic compound, and an .alpha.,.beta.-unsaturated carbonyl compound that are blended with the base polymer. Since the room temperature curable rubber composition is cured with water in the air and at the same time the dehydration condensation of the carbonyl group and the amino group produces water in the composition, the quick curability and deep curability are improved remarkably.

Abstract: Internal mould release compositions suitable for use in the production of moulded articles by the RIM process, comprises a blend of a metal salt of an organic acid and a polysiloxane polymer having isocyanate reactive organic groups and optionally a compatibilizing amount of an amidine or imidate compound.

Abstract: Internal mould release compositions suitable for use in the production of moulded articles by the RIM process, comprises a blend of a metal salt of an organic acid and a polysiloxane polymer having isocyanate reactive organic groups and optionally a compatibilizing amount of an amidine or imidate compound.

Abstract: A conductive silicone rubber composition is prepared by mixing an organopolysiloxane having an aminoalkyl radical, an organopolysiloxane having a (meth)acryloxyalkyl or glycidoxyalkyl radical, and conductive carbon black to form silicone rubber composition (A) in which the carbon black is fixed, and then mixing it with a silicone rubber composition (B) comprising a dimethylpolysiloxane. The composition has stable resistivity in the semiconductive region independent of molding conditions.

Abstract: This invention relates to one-component silicone systems (herein referred to as 1-C-RTV compounds) which cure rapidly under the effect of moisture with elimination of certain carbonamides, develop good adhesion to many substrates in the process and give vulcanizates that are stable under extreme climatic conditions.

Abstract: A room-temperature-curable organopolysiloxane composition having a highly durable adhesion that bonds well to various substrates, e.g. glass, plastics, and metals, through contact-curing and exhibits an excellent early-cure adhesiveness and that cures to give a silicone rubber that is highly water-resistant and exhibits long-term retention of its bonding strength even in hostile ambients, e.g. immersion in hot water, comprises a composition of a hydroxyl-terminated or alkoxy-terminated organopolysiloxane, an inorganic filler, a rosin ester in which the ester is a polyol, a reaction mixture from aminoalkylalkoxysilane and epoxyalkylalkoxysilane, and a curing catalyst.

Abstract: Aqueous dispersions which are suitable for the treatment of fibre materials, in particular textile materials, contain a polysiloxane having on average at least two hydroxyl groups bound to one silicon atom each and one polysiloxane having on average at least one amido group in the molecule. If the amidopolysiloxane does not contain a primary amino group, a third polysiloxane containing at least one primary amino group in the molecule must be additionally present in the dispersion. The fibre materials treated with these dispersions have a pleasant soft handle and a low tendency to yellow. The dispersant content can be lower than in known dispersions of amido-functional polysiloxanes.

Abstract: Internal mould release compositions suitable for use in the production of moulded articles by the RIM process, comprise a blend of a metal salt of an organic acid and a polysiloxane polymer having isocyanate reactive organic groups and optionally a compatibilizing amount of an amidine or imidate compound.

Abstract: A composition is disclosed which comprises an amino radical-containing organopolysiloxane and an organopolysiloxane containing at least 3 epoxy radical-containing organic groups in each molecule.

Abstract: A two part sealant cures rapidly in deep sections when the two parts are mixed together. A first part consists essentially of a hydroxyl endblocked polydiorganosiloxane, non-reinforcing, non-acidic filler, diacetamidosilane chain extender of the general formula ##STR1## and aminoxysilicone compound having from 1 to 100 silicone atoms per molecule and from 3 to 10 aminoxy groups per molecule. A second part consists essentially of a hydroxyl endblocked polydiorganosiloxane, non-reinforcing, non-acidic filler, and water. When mixed together, the two parts cure rapidly in deep sections.

Abstract: An alkoxy endblocked polydiorgansiloxane of the formulaZ--(SiR.sub.2 O).sub.n SiR.sub.2 --Zwhere Z is ##STR1## where Y isR.sub.a (R'O).sub.(3-a) Si--,X is ##STR2## in which a is 0 or 1, d has a value of 1 to 3 inclusive, v is 0 or 1, n.ltoreq.8, p has a value of 3 to 6 inclusive, q has a value of 2 to 6 inclusive, r has a value of 4 to 6 inclusive, w is 0 or 1, Me is methyl, R.sup.1 is an alkyl radical having from 1 to 6 inclusive carbon atoms, each R is a monovalent radical independently selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals, R' is an alkyl radical of 1 to 3 inclusive carbon atoms, R" is a divalent hydrocarbon radical selected from the group consisting of --(CH.sub.2).sub.b -- and --CH(Me)(CH.sub.2).sub.

Abstract: A highly stable emulsion of an organopolysiloxane suitable for use as a fabric-finishing agent is proposed which is prepared by mixing and agitating (a) an organopolysiloxane of a linear molecular structure having polyoxyalkylene groups and amino- or epoxy-substituted groups bonded to the silicon atoms, (b) a specified amount of a, preferably, non-ionic surface active agent having a specific HLB value and (c) water in an amount to form an oil-in-water type emulsion.

Abstract: An extrudable, self-extinguishing, room temperature-curable organopolysiloxane is obtained by combining a polydiorganosiloxane having hydrolyzable groups at the terminals, aluminum hydroxide microparticles having diameters not exceeding 50 micrometers, calcium carbonate microparticles having diameters not exceeding 20 micrometers, platinum or a platinum compound, and silane or siloxane containing at least three hydrolyzable groups.

Abstract: Room temperature vulcanizable silicone sealants containing acetoxy groups are fast curing. These sealants give off only small amounts of volatile materials which are generated during the curing process. These sealants contain crosslinkers and optionally chain extenders having azasilacycloalkane groups cure.

Abstract: A room temperature-curable fluorosilicone rubber composition is disclosed, which is capable of giving a cured silicone rubber having excellent resistance against organic solvents and petroleums withhigh curability despite the high fluorine content which may cause steric hindfrance against the curing reaction due to the bulkiness of the fluorine-containing substituent groups. Different from conventional fluorine-containing diorganopolysiloxanes, in which the fluorine-containing substituent groups are bonded to the silicon atoms at random positions throughout the molecule, several silicon atoms from each of the molecular chain ends of the diorganopolysiloxane as the principal ingredient of the inventive composition are free from fluorine-containing substituent groups so that the crosslinking reaction with the silanolic hydroxy groups bonded to the terminal silicon atoms is not disturbed by the fluorine-containing groups in the vicinity of the terminal silanol groups.

Abstract: Aqueous silicone dispersions crosslinkable into elastomeric state upon removal of water therefrom, well adapted for the production of paints and silicone elastomer seals, e.g., for the construction industry, include:(A) 100 parts by weight of an oil-in-water emulsion of an .alpha.,.omega.-(dihydroxy)polydiorganosiloxane, stabilized with an anionic and/or nonionic surfactant;(B) 0.1 to 20 parts by weight of an aminosilane and/or amidosilane;(C) 0 to 3 parts by weight of a metal curing catalyst; and(D) 0 to 250 parts by weight of a non-siliceous inorganic filler, such emulsion having a pH of from 7 to 13 and a dry solids content of at least 40%.

Abstract: A room temperature-curable organopolysiloxane composition, which is capable of giving a cured silicone rubber having excellent resistance against oils, e.g., automobile engine oil, and little responsible for foaming of the oil contaminated with the silicone rubber, can be prepared by first blending a silanol-terminated dimethyl polysiloxane, an iminoxy-substituted organosilane compound, e.g., vinyl tributanoxime silane, an organotin compound as a catalyst and an inorganic filler. e.g, zinc oxide, to give a uniform mixture and further admixing the uniform mixture with a trimethylsilyl-terminated dimethyl polysiloxane, an alkenyloxy-substituted organosilane compound, e.g., vinyl triisopropenyloxy silane, and a methyl polysiloxane having a network structure of the molecules as consisting of the monofunctional units of the formula (CH.sub.3).sub.3 SiO.sub.0.5 and tetrafunctional units of the formula SiO.sub.2 each in a specified amount.

Abstract: Single-component diorganopolysiloxane compositions, stable in storage in the absence of atmospheric moisture and crosslinkable into elastomeric state in the presence of moisture, well adapted, e.g., as sealants and adhesives for the construction industry, contain (A) a diorganopolysiloxane polymer having silanol endgroups, (B) a ketiminoxysilane crosslinking agent, (C) a stabilizing amount of an isocyanurate of the formula: ##STR1## (D) an inorganic filler material, and (E) a metal curing catalyst.

Abstract: A gasket and packing material which exhibits excellent adhesiveness to substrates and resistances to degradation of properties when exposed to hot hydrocarbon oils and coolants such as used in an automobile radiator are made by curing a composition which contains polydimethylsiloxane, an organopolysiloxane having R'.sub.3 SiO.sub.0.5 and SiO.sub.2 units or R'.sub.3 SiO.sub.0.5, R'.sub.2 SiO, and SiO.sub.2 units, an inorganic filler, an alkoxysilane adhesion promoter, and a ketoxime silicon compound crosslinker.

Abstract: What is disclosed and claimed are organopolysiloxanes having liquid crystalline properties at relatively low temperatures as compared to prior art materials. The organopolysiloxanes have this property by virtue of a unique chemical spacer between the siloxane and the mesogenic groups, which spacers are oxyalkylene groups.

Abstract: A primar composition comprising(A) 100 parts by weight of an organo-polysiloxane represented by the formula (1) ##EQU1## wherein R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon group, and a is a number of from 1.98 to 2.01, provided that 25 to 50 mol % of the hydrocarbon group is a perfluoroalkyl group and 0.01 to 10 mol % of the hydrocarbon group is a vinyl group, said organo-polysiloxane having a viscosity as measured at 25.degree. C. of 1,000,000 centistokes or more;(B) 5 to 100 parts by weight of a silica type filler;(C) 0.5 to 50 parts by weight of isocyanurate-type organosilicon compound represented by the formula (2) ##STR1## wherein R.sup.2 represents an alkyl group, a fluoroalkyl group or an alkoxyalkyl group, each having 1 to 5 carbon atoms in the alkyl moiety, and n is an integer of 1 to 5; and(D) a desired amount of an organic solvent.

Abstract: A silicone composition which is stable in the absence of moisture, but cures to an elastomer upon exposure to moisture consists essentially of a hydroxyl endblocked polydiorganosiloxane; a difunctionalsilane having acetamido, urea, or urethane functional groups; and a tetrafunctionalsilane having oximino functional groups. A composition containing 100 parts by weight of the polydiorganosiloxane, from 0.1 to 7 parts by weight of difunctionalsilane, from 0.1 to 7 parts by weight of tetrafunctionalsilane, and a ratio of difunctionalsilane to tetrafunctionalsilane of from 0.1 to 3, and optional filler is useful as a sealant or adhesive, having an improved skin over time.

Abstract: A moisture curable composition which is useful for sealing pavement joints consists essentially of 100 parts by weight of a hydroxyl endblocked polydiorganosiloxane, 55 to 120 parts of non-reinforcing, non-acidic filler wherein at least 40 percent by weight of the filler is treated with calcium stearate, 2.5 to 10 parts of diacetamidosilane, and 1 to 6 parts of aminoxysilicone compound. The composition is self leveling when applied to a horizontal surface and when cured has an elongation of at least 1200 percent, a durometer on the Shore OO scale of from 45 to 75 inclusive, and a modulus at 150 percent elongation of less than 50 pounds per square inch.

Abstract: Organopolysiloxanes having improved electrical properties, which comprises mixing an organopolysiloxane having reactive groups with an amine-containing organosilicon compound, which is capable of crosslinking with the organopolysiloxane and a treated alumina trihydrate and thereafter exposing the resultant composition to atmospheric moisture. The resultant composition may be dispersed in an organic solvent and applied to electrical insulators.

Abstract: A silicone sealant composition which bonds to dolomite containing concrete after exposure to moisture is obtained by adding a silicone fluid having greater than 2 mole percent epoxy functionality to a sealant of the type containing a hydroxyl endblocked polydiorganosiloxane, acetamidosilane chain extender, and crosslinking agent selected from the group consisting of triacetamidosilane and aminoxysilicon compound.

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: Linear triorganosiloxy-terminated organopolysiloxanes are prepared by the condensation of linear organopolysiloxanes having one Si-bonded hydroxyl group in each teminal unit in the presence of phosphonitrilic chloride, and after the organopolysiloxane has reached the desired average viscosity and while still containing the phosphonitrilic chloride, the organopolysiloxane is reacted with from 0.05 to 1 weight percent of hexaorganodisilazane, based on the weight of the starting organopolysiloxane, with the proviso that a filler having a BET surface area of at least 50 m.sup.2 /g does not exceed 1 weight percent, based on the weight of the starting organopolysiloxane.

Abstract: The room temperature curable silicone rubber composition of the invention is outstandingly free from the problem of surface stain when a cured elastomer thereof used, for example, in building works is prolongedly exposed to the atmosphere with very durable stain-preventing effect by the formulation of a surface active agent having at least one fluorine atom in a molecule and a specific organosilicon compound of the formula R.sup.1 --CO--NR.sup.2 --CH.sub.2).sub.b SiR.sup.3.sub.a O.sub.(3-a)/2, in which R.sup.1 and R.sup.2 are each a hydrogen atom or a monovalent hydrocarbon group, R.sup.3 is a hydrogen atom, or monovalent hydrocarbon group, a is 0-3 and b is a positive integer not larger than 10, in addition to the usual components of conventional room temperature curable silicone rubber compositions.

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: Aqueous emulsions for impregnating organic fibers, comprising, in addition to water and dispersants, (1) a diorganopolysiloxane having a Si-bonded hydroxyl group in each terminal unit and whose organic radicals are free of basic nitrogen atoms; (2) an organopolysiloxane containing diorganosiloxane units in which the two organic radicals are monovalent hydrocarbon radicals and also contains at least two monovalent SiC-bonded organic radicals per molecule having a basic nitrogen atom in which the organopolysiloxane is present in the emulsion in an amount of from 5 to 50 weight percent based on the weight of the diorganopolysiloxane (1); (3) an organosilicon compound selected from an organosilane containing at least two SiOC-bonded monovalent organic radicals consisting of carbon, hydrogen and possibly oxygen and/or partial hydrolyzates thereof, in which the organosilicon compound is present in the emulsion in an amount of from 2 to 6 weight percent based on the total weight of the diorganopolysiloxane (1) and o

Abstract: Described is a method of producing silicone aqueous emulsion compositions which cure at room temperature by the removal of water to form elastomeric coatings or films with superior surface gloss, good adhesion to substrates, and rustproofness. The method prepares an emulsion of polydiorganosiloxane having at least two hydroxyl groups per molecule, colloidal silica or alkali metal silicate, curing catalyst, emulsifier, and water, the emulsion having a pH of from 9 to 12. After a period of ripening for a period of time, so that an elastomeric material will be formed when water is removed at room temperature, an amino-functional silane or its partial hydrolyzate is added to give the emulsion its improved properties.

Abstract: In accordance with the present invention, there is provided a one-component alkoxy-functional RTV silicone rubber composition in which all the ingredients are continuously mixed in, generally, a devolatilizing extruder. In a more preferred embodiment, the polyalkoxy diorganopolysiloxane polymer is first formed in a static mixer and then this polymer along with the other ingredients are continuously mixed in a devolatilizing extruder to continuously form a preferred alkoxy-functional one component RTV composition of the instant case.

Abstract: Radiation polymerizable compositions containing organopolysiloxanes having an average of at least one nitrogen-containing group per molecule linked to a silicon atom through an Si--N or Si--O--N linkage and a photo-induced free radical source.

Abstract: A low modulus, one component, room temperature vulcanizable silicone elastomer which has very good oil resistance properties as well as high elongation. The silicone elastomer which has low volatility comprises a silanol terminated diorganosiloxane base polymer, a trimethylsilyl terminated diorganopolysiloxane, generally a tin catalyst, as well as a oxime crosslinking agent and specific low moisture fillers, usually calcium carbonate. The material is ideally suited as a gasket sealant as well as a formed-in-place gasket and can be utilized on internal combustion engines such as automotive engines as a sealant for an oil pan, valve cover, side seals and the like.

Abstract: Stable, substantially acid-free, one package, moisture curable RTV compositions are provided having a scavenger for chemically combined hydroxy groups of the formula ##STR1## where x equals 1 or 2 and y equals 0 to 3 inclusive. A method for providing the aforesaid moisture curable RTV compositions is also provided. Novel compounds of the formula ##STR2## where x equals 1 or 2 and y equals 0 to 2 inclusive are provided as are methods for making such novel compounds.

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: A composition for concealing grazes or scratches on glass surfaces comprising an emulsion of composition (A) and composition (B), said composition (A) comprising the emulsion-polymerization product of:(1) 0.1-60 weight percent of (A) of the reaction product of:(a) 0.1-50 weight percent of (a) and (b) of the product obtained by reacting:(i) 1 mole of a compound of the formula Q.sup.1 NHR.sup.1 SiR.sub.a.sup.2 (OR).sub.3-a with(ii) 0.5-3.0 moles of a compound of the formula Q.sup.2 R.sup.4 SiR.sub.a.sup.2 (OR).sup.6).sub.3-b ;(b) 50-99.9 weight percent of (a) and (b) of a polydiorganosiloxane having at least one silanol group and a viscosity at 25.degree. C. of 5-10,000 cSt;(2) 1-50 weight percent of (A) of a compound of the formula (R.sup.7 R.sup.8 SiO).sub.n ;(3) 0.

Abstract: Stable, substantially acid-free, one package moisture curable alkoxy-terminated organopolysiloxane compositions are provided having a condensation catalyst and a stabilizer or scavenger for materials having chemically combined hydroxy radicals in the form of an N-silyl-substituted imidazole.

Abstract: A polishing agent composition containing a polyorganosiloxane preparation comprising:(A) from 4 to 40% by weight of a benzene soluble polyorganosiloxane resin comprising:(1) 70 to 100 mole percent (R.sup.1).sub.3 SiO.sub.1/2 units, and(2) 0 to 30 mole percent (R.sup.2).sub.2 SiO units and having Si bonded OR.sup.3 groups;(B) from 55 to 95% by weight of a liquid linear or branched polyorganosiloxane terminated by (HO)(R.sup.4).sub.2 SiO.sub.1/2 units or (R.sup.4).sub.3 SiO.sub.1/2 units, and whose units other than the terminal units comprise 90 to 100 mole percent (R.sup.5).sub.2 SiO units and 0 to 10 mole percent(R.sup.5).sub.a SiO.sub.

Abstract: The adhesion of self-bonding, low modulus, one package, room temperature vulcanizable silicone compositions to a variety of substrates is effectively promoted by incorporation in the silicon composition, before curing, of a small effective amount of an adhesion promoting composition comprising at least one maleamidylalkyltrialkoxysilane or maleamidylalkyltriacyloxysilane compound of the formula: ##STR1## wherein A is divalent alkylene of from 2 to 6 carbon atoms and R.sup.1, R.sup.2 and R.sup.3 are, independently, C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkanoyl.

Abstract: A process for producing a shelf-stable catalyst component for a room temperature vulcanizable silicone rubber composition comprising (a) mixing a organopolysiloxane fluid with first from 1 to 15 percent by weight of the total amounts of the following ingredients (1) an alkyl silicate cross-linking agent (2) a catalytic promoter which is a tin salt and (3) a self-bonding additive which is nitrogen-functional self-bonding additive until there is a uniform mixture; (b) adding to the mixture from 10 to 250 parts of filler and mixing the ingredients to a uniform mixture wherein the mixture is heated at a temperature of at least 100.degree. C. for at least 1 hour so as to drive off moisture and form a stable base mixture and then adding to the stable base mixture the rest of the cross-linking agent, the catalytic promoter and the shelf-bonding additive to form a self-stable uniform mixture.

Abstract: Paintable, cured polyorganosiloxane sealants are prepared at room temperature from room temperature curable compositions containing a hydroxyl-terminated polyorganosiloxane, an organosilicon compound containing at least two amido groups, aminoxy groups or combinations thereof, per molecule and a substituted alcohol where the substituent is acyloxy, alkoxycarbonyl, cyano, ##STR1## mercapto, or the combination of a carbon-to-carbon triple bond and an ether-type oxygen atom, where each Y and Z are individually selected from the group consisting of hydrogen, hydrocarbyl and halohydrocarbyl.

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: 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: A flowable, room temperature vulcanizable silicone composition is obtained by mixing 100 parts by weight of hydroxyl endblocked polydiorganosiloxane, 0 to 150 parts by weight of a nonacidic, nonreinforcing filler, 2 to 20 parts by weight of methylvinyldi-(epsilon-caprolactamo)silane and 0.25 to 7 parts by weight of an aminoxysilicon compound having 3 to 10 aminoxy groups per molecule. The composition cures on exposure to moisture to a low modulus silicone elastomer which is useful as a sealant for horizontal joints such as in highways or outdoor patios.