Abstract: Disclosed herein is a foamable organopolysiloxane composition which comprises an organopolysiloxane base polymer containing a vinyl group-containing organopolysiloxane, organohydroxypolysiloxane, and organohydrogenpolysiloxane, and a specific siloxane copolymer containing an alkenyloxysilyl group. The composition readily foams and cures at room temperature to give a silicone rubber foam of high strength, which is useful as a filler and sealant for buildings.

Abstract: New polysiloxane contact lenses are described which are prepared from polysiloxanes bearing at least three polymerizable vinyl groups by copolymerization with acrylic comonomers. The new lens materials are characterized by a superior combination of high oxygen permeability and rigidity.

Abstract: The subject-matter of the invention are organomineral foamed materials and a process for their preparation by reacting polyisocyanate and water-glass without the use of a foaming agent. In the process according to the invention the foaming of the reaction mixture is achieved in controlled manner by means of the CO.sub.2 released in the reaction of isocyanate groups with water by the addition of a polysiloxane and polyether block copolymer.

Abstract: The specification describes and claims a method of producing a foamed mass having a density of less than 150 kg/m.sup.3 adherent to surfaces of a cavity which comprises inserting into the cavity a foamable composition formed by mixing impinging jets of two or more parts of a foamable silicone composition capable of curing at 20.degree. C. within 2 minutes to provide a foamed mass having a density of less than 150 kg/m.sup.3. The Compositions comprises (a) one or more polysiloxanes having not less than three alkylhydrogensiloxane units per molecular, (b) one or more polysiloxanes having not less than two silicon-bonded hydroxyl groups per molecule, (c) one or more compounds having carbon-bonded hydroxyl groups present in a proportion to provide from 0 to 2% by weight of the composition, (d) a polyorganosiloxane compriing [F(CF.sub.2).sub.m (CH.sub.2).sub.n O].sub.p SiO.sub.4-p/2, R.sub.3 SiO.sub.1/2 and SiO.sub.

Abstract: A fire-retardant coating material includes a fluid intumescent material and refractory fibers of various sizes dispersed or suspended therein for particular applications. The fluid intumescent material includes a foaming agent, a blowing agent gas source, a carbonific or charring agent, a film-forming binder, a solvent and, in some cases, a pigment or filler. The refractory fibers consist of aluminum oxide, silicon dioxide, and one or more other metal oxides.

Abstract: A method is provided for reducing the density of silicone foam resulting from the generation of hydrogen gas by employing a hydride polysiloxane in the form of a mixture of linear hydride polysiloxane and cyclic hydride polysiloxane. Aqueous methanol is also found to be an effective density-reducing agent.

Abstract: Low viscosity elastomeric silicone foam compositions are produced which do not bleed, split or rupture with cure where viscosity is controlled by controlling the content of the vinyl containing polysiloxane portion of the foam.

Abstract: The invention relates to compositions comprising (A) polydiorganosiloxanes containing vinyl groups, (B) polyorganohydrogensiloxanes, (C) platinum catalysts, and (D) a saturated polyhydric alcohol having at least two hydroxyl groups per molecule, which can be cured at temperatures of from room temperature to over 100.degree. C. by the addition of the Si-bonded H atoms in the polyorganohydrogensiloxane (B) to the vinyl groups in the polydiorganosiloxanes (A) with the aid of the platinum catalysts (C), to form elastomeric foams. The density and type of pores may be controlled by compound (D) containing hydroxyl groups as a "blowing agent".

Abstract: A foamable silicone rubber composition, comprising:(A) a polyorganosilphenylenesiloxane copolymer represented by Formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are each a particular monohydrocarbon group, and a and h are each an integer of 1 or more and have the relation of 1.gtoreq.a/b.gtoreq.0.05 and a+b.gtoreq.100,(B) an organosilicon compound containing a particular organosiloxy unit having a hydroxyl group,(C) a polyorganohydrogenosiloxane having at least two particular units having an Si--H bond, and(D) a platinum family metal catalyst.This composition can provide a foam with good mechanical strength.

Abstract: Moldable foam beads comprising a silane-crosslinked polyolefin foam are produced by mixing a composition comprising a silane-modified polyolefin (such as a silane-grafted polyethylene) and a silanol condensation catalyst in an extruder to produce a melt, then injecting a blowing agent into the melt at a rate effective to produce a desired foam density in the extrudate; extruding and cutting the melt to form foam beads; and exposing the foam beads to moisture to produce silane crosslinking of the polyolefin foam.

Abstract: Process of producing a foamed product by forming a shaped article from a composition comprising a thermoplastic olefin polymer, a hydrolyzable, unsaturated silane, a gas generating compound and an organic peroxide in an amount of about 0.5 to about 2 percent by weight, and thereafter subjecting the shaped article to elevated temperatures to activate the gas generating compound and organic peroxide.

Abstract: A compound type silicone gel material which uses silicone gel having a penetration of 50 to 200 as basic material and contains a number of fine hollow cells.

Abstract: A method to make a silicone foam. A layer of crystalline material is embedded in a layer of uncured silicone. The crystalline material is closely packed in crystal-to-crystal contact, the crystals being provided in a plurality of sizes or ranges of size to increase the packing ratio of the crystals as a group. The silicone is cured and then the crystals are dissolved out with a solvent that dissolves them but does not dissolve the silicone.

Abstract: Silicone foams having a reduced density can be made by cooling the foam components of vinyl-terminated polydiorganosiloxane, methylhydrogenpolysiloxane, hydroxylated material, such as water and platinum catalysts, and mixing and maintaining the foamable mixture at a temperature of less than 5.degree. C.

Abstract: A polyurethane emulsion is composed of an organic solvent solution of a polyurethane resin containing silicone segments and/or fluorocarbon segments as backbones and/or side chains and water emulsified in the organic solvent solution. A sheet-like porous material having a porous layer of a polyurethane resin provided on a base material is produced by using the above polyurethane emulsion to form the porous layer.

Abstract: A method is provided for reducing the density of silicone foam from a platinum catalyzed foamable two-package mixture of vinyl organosiloxane, organohydrogen siloxane, and hydroxylated material. The platinum catalyst used in the foamable mixture is in the form of a mixture of a platinum vinyl siloxane and a platinum triarylphosphine. A platinum catalyst mixture of platinum vinylsiloxane and triarylphosphine also has been found effective.

Abstract: A method is provided for reducing the density of silicone foam from a platinum catalyzed foamable two-package mixture of vinyl organosiloxane, organohydrogen siloxane, and hydroxylated material. The platinum catalyst used in the foamable mixture is in the form of a mixture of a platinum vinyl siloxane and a platinum triarylphosphine. A platinum catalyst mixture of platinum vinylsiloxane and triarylphosphine also has been found effective.

Abstract: Viscous liquids containing polymeric materials which will interact with one another upon contact and generate gas for foam expansion are intimately and homogeneously mixed in a very short period of time by passing them successively and continuously through first and second rotary dynamic shearing mixers, the first mixer being considerably smaller than the second mixer, and the mixture experiencing a brief period of respite from shearing between the two mixers. The mixture experiences a much higher degree of shear in the first mixer, where the heat necessary for promoting the reaction is provided through the shearing action but without creating localized hot-spots. The process is particularly well suited for the preparation of foamed polydiorganosiloxanes, on a continuous, commercial scale.

Abstract: A noise-reducing foam member for prolonged exposure to ultraviolet radiation without degradation consists essentially of a major proportion of a room-temperature silicone rubber foaming material and minor proportions of a room-temperature foaming curing agent and at least two and preferably three ultraviolet stabilizing materials selected from the group consisting of carbon black, cerium oxide, 2(2'-hydroxy-3',5'-di-tert-amylphenyl) benzotriazole and zinc oxide.The foam member is made by mixing together suitable quantities of the silicone rubber foaming material, the ultraviolet stabilizing materials and the curing agent. The mixture is then cured to provide the foam member.

Abstract: Silicone foams are provided which have increased tensile strength as the result of using an effective amount of a silicone polyimide block copolymer having chemically combined organovinylsiloxy units in the silicone block.

Abstract: Ketoxime compounds are added to foamable elastomeric silicone foam contain organic alcohol as a hydroxyl source to reduce foam density.

Abstract: The curable and foamable organopolysiloxane composition comprises three different organopolysiloxanes, of which (A) the first is an .alpha.,.omega.-divinyl dimethyl polysiloxane, (B) the second is an organopolysiloxane having, in a molecule, at least three silicon-bonded hydroxy groups and (C) the third is an organohydrogenpolysiloxane having, in a molecule, at least two silicon-bonded hydrogen atoms, along with a platinum catalyst. The platinum-catalyzed curing and foaming reactions proceed in two ways of, one, the hydrosilation between the vinyl groups in (A) and the silicon-bonded hydrogen atoms in (C) and, the other, by the dehydrogenation between the silanol groups in (B) and the silicon-bonded hydrogen atoms in (C). The composition gives a cured and foamed silicone rubber body having excellent mechanical properties with a good cell structure by standing at room temperature or by heating up to 70.degree. C.

Abstract: Epihalohydrin compounds will react chemically with alkali oxidated silicon compounds in the presence of a peroxide to produce a self-standing cellular or solid epoxy silicate product which may be utilized for thermal and sound insulation, as a cavity filler and as a coating agent.

Abstract: A method for producing methylpolydisilylazane polymers of reduced chloride content that exhibit no increase in pyrophoricity and exhibit improved shelf life. The methylpolydisilylazane polymers of reduced chloride content are useful in the production of silicon nitride and silSTATEMENT OF GOVERNMENT RIGHTSThe United States Government has rights in this invention pursuant to Contract Number F33615-85-C-5006 awarded by the United States Air Force.

Abstract: Foamed organic silicate produced by chemically reacting an alkali oxidated silicon compound with a substituted organic compound in the presence of a peroxide compound. This self-standing cellular organic silicate product may be utilized for thermal and sound insulation, as a cavity filler and as a coating agent.

Abstract: Amine compounds are added to foamable elastomeric silicone foam to reduce foam density.

Abstract: An expandable ethylenic or styrenic polymer composition for production of lightly crosslinked foamed polymers and a process for controlling the degree of crosslinking of the polymer prior to extrusion foaming. The control is obtained by use of (a) a reversible gas-yielding crosslinking reaction which is delayed in the foam extrusion line in the presence of gaseous products (alcohols) and (b) added amounts of an alcohol such as an aliphatic alcohol. Suitable crosslinking agents include silanes, azido functional silanes, titanates, and amino compounds.

Abstract: Treated filler having surface nitrogen groups is added to silicone foam to reduce density.

Abstract: Silicone flexible foams of good fire-resistance and extremely low density from about 5 to 14 lbs/ft..sup.3, having good mechanical and physical properties, are provided. The curable and foamable compositions are prepared from a multi-component mixture comprising, as part A, a high molecular weight uncured vinyl-terminated siloxane polymer, a polydimethyl silanol terminated reactive diluent, and an inorganic filler to improve fire resistance, water and a complex platinum catalyst, and as part B, a polydimethyl hydrogen siloxane. The viscosity of part A of the mixture prior to gelling and foaming is from about 30,000-65,000 cps. This mixture becomes foamable and curable at ambient temperature.

Abstract: A membrane for selectively separating gases having high and selective permeability for oxygen and sufficient strength which is capable of extracting and concentrating oxygen in a mixed gases, especially in the air, and is produced from a novel poly(disubstituted acetylene)/polyorganosiloxane graft copolymer where the main chain is composed of poly(disubstituted acetylene) and the side chain is composed of polyorganosiloxane, and the copolymer.

Abstract: Flame-retardant polyurethane products are produced by mixing and reacting a basic salt-forming compound with an acidic salt-forming compound containing phosphorus and/or halogen compounds in a polyol and/or a polyisocyanate, then reacting the polyol and polyisocyanate.The flame-retardant polyurethane products may be used for thermal and sound insulation, as a coating agent, as an adhesive. for caulking, for cushioning and for molding useful objects.

Abstract: Polydiorganosiloxane compositions useful for producing flame resistant foam of the type containing finely divided nonmetallic fibrous heat resistant material and finely divided nonmetallic cellular heat resistant material tend to separate upon long time storage. The compositions remain homogeneous upon storage when at least 0.1 weight percent of fume silica is included in the composition during the mixing of the ingredients before storage.

Abstract: Epihalohydrin compounds will react chemically with alkali oxidated silicon compounds in the presence of a peroxide to produce a self-standing cellular or solid epoxy silicate product which may be utilized for thermal and sound insulation, as a cavity filler and as a coating agent.

Abstract: A foamable composition comprising a polymer selected from the group consisting of a hydrolyzable ethylene/silane copolymer and a hydrolyzable ethylene/ethyl acrylate/silane terpolymer and the following components in about the following amounts per 100 parts by weight of polymer:______________________________________ Component Parts by Weight ______________________________________ azodicarbonamide 1 to 25 p,p'oxybis-benzene 0.5 to 3.5 sulfonyl hydrazide silanol condensation catalyst 0.02 to 0.

Abstract: A new class of hydrocarbon foaming agents which are block copolymers, one block of which is a styrene derivative, the other a vinylsilane derivative. Said hydrocarbon foaming agents are nonreactive with common anionic initiators.

Abstract: The specification is directed to polysiloxane foams. There are disclosed compositions capable of curing at room temperature which comprise a hydroxypolysiloxane, an alkylhydrogen polysiloxane, a tin compound as catalyst and finely divided filler. According to the invention storage stability of these foam forming polysiloxane compositions is improved by use as filler of silica which has been pretreated to render is hydrophobic. The subject compositions may comprise two components which do not require individual mixing prior to mixing together of the components. The compositions may be packaged in any convenient manner. The compositions may be used for a variety of purposes, for example to provide medical dressings.

Abstract: The intumescent material of this invention comprises a filled polyorganosiloxane composition that is elastomeric in the cured form and up to 70 parts by weight per 100 parts by weight of said composition of hollow, thermoplastic microspheres filled with a volatile liquid. The materials are particularly useful as flame and smoke barriers in passages of partitions that are traversed by thermoplastic articles such as pipes and conduits, and can optionally contain chemical blowing agents.

Abstract: Novel blowing agents for foamable organopolysiloxane compositions, notably the platinum-catalyzed such organopolysiloxane compositions, comprise admixture of calcium carbonate and an organic carboxylic acid.

Abstract: A process for manufacturing foamed silicone compositions by foaming a cross-linkable composition which comprises:(a) 100 parts by weight of a vinyl-containing polysiloxane containing 0.0002 to 3% by weight of vinyl groups and a viscosity of from 0.1 to 1,000 Pascal-seconds at 25.degree. C.,(b) up to 10 parts by weight of a silanol-containing silicon compound with a viscosity from 0.01 to 10 Pascal-seconds at 25.degree. C.,(c) up to 200 parts by weight of filler,(d) 1 to 50 parts by weight of a polysiloxane with a viscosity of 0.005 to 0.1 Pascal-seconds at 25.degree. C., and(e) a platinum catalyst, is characterized by foaming the cross-linkable composition with a substance containing hydroxyl groups at temperatures of 50.degree. to 150.degree. C.

Abstract: Moldable foam beads comprising a silane-crosslinked polyolefin foam are produced by mixing a composition comprising a silane-modified polyolefin (such as a silane-grafted polyethylene) and a silanol condensation catalyst in an extruder to produce a melt, then injecting a blowing agent into the melt at a rate effective to produce a desired foam density in the extrudate; extruding and cutting the melt to form foam beads; and exposing the foam beads to moisture to produce silane crosslinking of the polyolefin foam.

Abstract: Foamed organic silicate produced by chemically reacting an alkali oxidated silicon compound with a substituted organic compound in the presence of a peroxide compound. This self-standing cellular organic silicate product may be utilized for thermal and sound insulation, as a cavity filler and as a coating agent.

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: The present invention relates to intumescent polysiloxane molding compositions containing expandable graphite compounds and, if appropriate, additionally nitrogen-containing phosphates.

Abstract: An expandable ethylenic or styrenic polymer composition for production of lightly crosslinked foamed polymers and a process for controlling the degree of crosslinking of the polymer prior to extrusion foaming. The control is obtained by use of (a) a reversible gas-yielding crosslinking reaction which is delayed in the foam extrusion line in the presence of gaseous products (alcohols) and (b) added amounts of an alcohol such as an aliphatic alcohol. Suitable crosslinking agents include silanes, azido functional silanes, titanates, and amino compounds.

Abstract: Plastic foams are prepared by reacting a compound containing Si-bonded hydrogen and at least one SiC-bonded radical having a basic nitrogen atom in the same molecule with a hydroxyl-containing compound.

Abstract: A polymeric composition is provided which includes the reaction product of vinylidene chloride, an optional copolymerizable monomer, and an .alpha.,.beta. ethylenically unsaturated silane crosslinking agent. The polymeric reaction product may also be used to form films and coating. The composition further may include a volatile blowing agent which, when activated, expands the polymeric reaction product into a low density cellular structure.

Abstract: The intumescent material of this invention comprises a filled polyorganosiloxane composition that is elastomeric in the cured form and up to 70 parts by weight per 100 parts by weight of said composition of hollow, thermoplastic microspheres filled with a volatile liquid. The materials are particularly useful as flame and smoke barriers in passages of partitions that are traversed by thermoplastic articles such as pipes and conduits, and can optionally contain chemical blowing agents.

Abstract: A steam expandable alkenyl aromatic polymer composition and methods of preparation are provided. The composition is mixed with a volatile blowing agent containing, as a primary blowing agent, dichlorodifluoromethane and as a secondary blowing agent, a halogenated hydrocarbon, a hydrocarbon, or an aliphatic alcohol containing from 1 to 4 carbon atoms, the secondary blowing agent having a normal atmospherpic boiling point of from about 0.degree. to about 100.degree. C. The composition may be expanded by steam immediately after extrusion foaming or may be expanded after aging of the composition which has been impregnated with volatile blowing agent.

Abstract: Epihalohydrin compounds will react chemically with alkali oxidated silicon compounds in the presence of a peroxide to produce a self-standing cellular or solid epoxy silicate product which may be utilized for thermal and sound insulation, as a cavity filler and as a coating agent.

Abstract: A steam expandable alkenyl aromatic polymer composition and methods of preparation are provided. The composition is mixed with a volatile blowing agent containing, as a primary blowing agent, dichlorodifluoromethane and as a secondary blowing agent, a halogenated hydrocarbon, a hydrocarbon, or an aliphatic alcohol containing from 1 to 4 carbon atoms, the secondary blowing agent having a normal atmospherpic boiling point of from about 0.degree. to about 100.degree. C. The composition may be expanded by steam immediately after extrusion foaming or may be expanded after aging of the composition which has been impregnated with volatile blowing agent.