Abstract: An optically clear platinum-group metal curable liquid silicone rubber composition having good physical properties. The composition comprises a vinyldimethylsiloxy-terminated polydimethyl(diphenyl)siloxane copolymer comprising about 1 to 20 mole percent diphenylsiloxy units and having a viscosity within a range of about 20,000 mPa.multidot.s to 100,000 mPa.multidot.s at 25.degree. C., vinyldimethylsiloxy-terminated polydimethyl(diphenyl)siloxane copolymer comprising about 1 to 20 mole percent diphenylsiloxy units and having a viscosity within a range of about 50 mPa.multidot.s to 10,000 mPa.multidot.s at 25.degree. C. and optionally comprising up to about 3 mole percent vinyldimethylsiloxy units, a treated reinforcing silica filler, and curing agents.

Abstract: The invention relates to an ablator composition for providing ablation protection. The ablator composition comprises 100 parts by weight of a mixture of vinyl-containing organopolysiloxanes, the mixture containing 50-80 wt. % of a diorganopolysiloxane which contains vinyl groups and 20-50 wt. % of a silicone resin which contains vinyl groups; an organohydrogenpolysiloxane containing in one molecule thereof at least three hydrogen atoms which are directly bonded to silicon atoms thereof; a catalyst which is at least one selected from the group consisting of metallic platinum and platinum compounds; up to 150 parts by weight of silica microballoons; and at least one selected from the group consisting of up to 15 parts by weight of quartz glass fibers and up to 15 parts by weight of carbon fibers. An ablator material prepared by curing the ablator composition has a low surface recession rate even under a condition of a high heating rate such as about 4 MW/m.sup.

Abstract: CVE polyorganosiloxane compositions crosslinkable into silicone elastomeric state, well suited for the protective coating of a wide variety of substrates and supports, notably vehicular airbags, are improvedly adhered thereto by including in said CVE silicone compositions an adhesiveness promoter comprising (1) at least one alkoxylated organosilane containing, per molecule, at least one C.sub.2 -C.sub.6 alkenyl radical, (2) at least one organosilicon compound containing at least one epoxy radical, and (3) at least one chelate of metal M and/or a metal alkoxide having the formula: M(OJ).sub.n, wherein n is the valency of M, J is a linear or branched C.sub.1 -C.sub.8 alkyl radical, and M is selected from among Ti, Zr, Ge, Li, Mn, Fe, Al and Mg.

Abstract: The invention relates to organopolysiloxane compositions that when crosslinked form electroconductive elastomers. The elastomers are formed via an addition crosslinking method and contain 11% to 30% by weight with respect to the total composition of carbon fibers having a 0.1 to 10 mm average length. The compositions are suitable for producing injection molded articles.

Abstract: Silicone gels are made by reacting an .tbd.Si--H containing polysiloxane with an alpha, omega-diene. The reaction is conducted in the presence of a platinum catalyst and in the presence of a low molecular weight silicone oil. The reaction is continued until a gel is formed by crosslinking and addition of .tbd.Si--H across double bonds in the alpha, omega-diene. The silicone gel can then be crumbled into a silicone powder using mechanical force. When additional amounts of low molecular weight silicone oil are added to the gel, and the silicone oil and the gel are subjected to shear force, a silicone paste can be formed.

Abstract: An addition reaction-type dimethylsilicone composition, including a diorganopolysiloxane containing a reactive vinyl group; an organopolysiloxane containing an active hydrogen atom; and silicic acid fine powder of which surface has been treated with a fluoroalkylsilane, an alkylsilane compound, a fluorosilicone oil, a dimethylsilicone oil, or a mixture thereof, and a silane compound containing an unsaturated group having a reactivity to the organopolysiloxane containing an active hydrogen atom.

Abstract: A silicone rubber article (such as a wiper blade) has a low process fluid leach rate and high resiliency. The composition comprises, prior to cure, approximately 100 parts by weight of a vulcanizable elastomer including at least one silicone polymer, at least one crosslinkable process fluid, and low pressure and high pressure peroxide catalysts to accommodate a two-stage vulcanization process. According to the invention, the composition provides anti-hazing qualities and confers hydrophobic properties to a contacted surface. The polymer also includes about 50 to 220 parts by weight of a siliceous filler.

Abstract: The present invention provides a sealing component for connector waterproofing having an excellent heat resistance, low-temperature resistance and oil resistance which can be economically produced in a reduced molding time. A novel sealing component for connector waterproofing is provided, which comprises a vulcanized composition comprising at least (a) 100 parts by weight of an organopolysiloxane represented by the following average composition formula (I), (b) from 5 to 500 parts by weight of a finely divided silica filler, (c) from 0.01 to 5 parts by weight of a dialkyl peroxide or peroxy ketal which has a half-life of 1 hour at a temperature of from 130.degree. C. to 150.degree. C., (d) from 0.1 to 5 parts by weight of a silicon compound having two or more Si--H bonds per molecule, and (e) from 0.01 to 2 parts by weight of an organic peroxide represented by the following general formula (II):R.sup.1.sub.m SiO.sub.(4-m)/2 (I)wherein R.sup.

Abstract: A method of making an organopolysiloxane sheet or tube polymer involves contacting a sheet or tube silicate with an organo-H-chlorosilane to form an organosiloxane sheet or tube polymer with pendent .tbd.Si--H groups. Subsequently, the organosiloxane sheet or tube polymer with pendent .tbd.Si--H groups is contacted with an alkenyl group containing compound in the presence of a hydrosilation catalyst. The catalyst is used in an amount effective to catalyze a hydrosilation reaction between the alkenyl group on the alkenyl group containing compound and the hydride functionality on the organosiloxane sheet or tube polymer with pendent .tbd.

Abstract: The present invention provides a sealing component for connector waterproofing having an excellent heat resistance, low-temperature resistance and oil resistance which can be economically produced in a reduced molding time. A novel sealing component for connector waterproofing is provided, which comprises a vulcanized composition comprising at least (a) 100 parts by weight of an organopolysiloxane represented by the following average composition formula (I) containing at least two alkenyl groups per molecule and having a viscosity of at least 100,000 cs, (b) from 0.1 to 20 parts by weight of an organohydrogenpolysiloxane represented by the following average composition formula (II) containing at least two hydrogen atoms directly bonded to silicon atom per molecule, (c) from 5 to 500 parts by weight of a finely divided silica filler, (d) the catalytic amount of a platinum catalyst, (e) from 0.005 to 5 parts by weight of a sulfide compound represented by the following general formula (III), and (f) from 0.

Abstract: A silicone rubber composition which has excellent adhesion to various substrate materials with which it is in contact during its curing. The silicone rubber composition comprises an adhesion promoter comprising an addition reaction product or a reaction mixture of (i) a carboxylic acid ester described by general formula ##STR1## where R.sup.2 is an alkenyl group and x is a number of 1 to 6, and (ii) an alkoxysilane expressed by general formula ##STR2## where R.sup.3 is a monovalent hydrocarbon group which does not contain aliphatic unsaturated linkage, R.sup.4 is an alkyl group, and a is a number of 1 to 3.

Abstract: Organopolysiloxane sheet or tube polymers are made by contacting a sheet or tube silicate with an alkenyl group containing chlorosilane to form an alkenylsiloxy polymer, and subsequently contacting the alkenylsiloxy sheet or tube polymer with a hydrosilane or hydrosiloxane in the presence of a hydrosilation catalyst, to catalyze a reaction between the alkenyl group on the alkenylsiloxy polymer and hydride functionality on the hydrosilane or hydrosiloxane. Silylalkoxysiloxane sheet or tube polymers are made by contacting a sheet or tube silicate with an acidic solution of an alkenyl alcohol to form a polymeric sheet or tube alkenyloxysiloxane, and subsequently contacting the alkenyloxysiloxane with a hydrosilane or hydrosiloxane in the presence of a hydrosilation catalyst, to catalyze a reaction between the alkenyl group on the alkenyloxysiloxane and hydride functionality on the hydrosilane or hydrosiloxane.

Abstract: A silicone rubber composition comprising an organopolysiloxane and a reinforcing silica filler can be improved in crepe hardening and shelf stability by blending a specific compound as a wetter.

Abstract: Organopolysiloxane compositions which cure by the addition reaction of silicon-bonded lower alkenyl radicals with silicon-bonded hydrogen atoms and which exhibit improved adhesion to a variety of substrates. The compositions comprise an adhesion promoting mixture comprising an epoxy-functional compound, a compound having at least one hydroxy group and in the same molecule at least one substituent selected from a group consisting of silicon hydride, alkenyl, and acryl, and an aluminum compound or zirconium compound. Compression set of the cured organopolysiloxane compositions is not significantly effected by the adhesion promoting mixture.

Abstract: The present invention provides novel dental impression materials, the cure of which can be monitored visually, comprising: (1) a curable silicone polymer; (2) a crosslinker compound containing silicon-bonded-hydrogen groups; (3) a hydrosilation catalyst; and (4) one or more cure-indicating dyes that exhibit a color change in the presence of a silicon-bonded-hydrogen compound and a hydrosilation catalyst. The cure-indicating dye provides the composition with an initial pre-cure color and a different post-cure color. As a result of this change in color, the state of cure of the impression material can be visually monitored.

Abstract: The present invention provides novel hydrosilation-curable compositions, the cure of which can be monitored visually, comprising: (1) an ethylenic compound; (2) a compound containing silicon-bonded-hydrogen groups; (3) a hydrosilation catalyst; and (4) one or more cure-indicating dyes with light absorption in the visible spectrum that exhibit a color change in the presence of a silicon-bonded-hydrogen compound and a precious metal hydrosilation catalyst. The cure-indicating dye provides the composition with an initial pre-cure color and a different post-cure color. As a result of this change in color, the state of cure of the composition can be visually monitored.

Abstract: The present invention relates to a release coating composition comprising an organopolysiloxane having fluorine containing organic groups and alkenyl groups, an organohydrogensiloxane, and a platinum-containing catalyst. The present invention also relates to a release coating composition comprising an organopolysiloxane having fluorine containing organic groups and silicon-bonded hydrogen groups, an alkenyl functional organopolysiloxane, and a platinum-containing catalyst. The curable silicone release coating compositions of this invention have excellent release properties from various tacky substances, especially silicone-based pressure sensitive adhesives, after curing, and also have excellent bonding characteristics when applied to various substrates.

Abstract: To a heat-curable silicone rubber composition comprising (a) an organopolysiloxane having at least two alkenyl groups in a molecule, (b) an organohydrogenpolysiloxane having at least two hydrogen atoms in a molecule, and (c) a platinum catalyst is added (d) ammonia or an ammonia precursor so that ammonia or ammonia precursor is present in an amount of 10 to 500 parts by weight of nitrogen per million parts by weight of the total of components (a), (b) and (c) in a cured product of the heat-curable silicone rubber composition. The composition cures into a silicone rubber having minimized compression set without a need for secondary vulcanization.

Abstract: A composition curable to a silicone elastomer is prepared by mixing a triorganosiloxy endblocked polydimethylsiloxane fluid where the triorganosiloxy is dimethylvinylsiloxy or methylphenylvinylsiloxy, a reinforcing silica having a surface treated with organosiloxane groups which contain 0.05 to 0.32 percent by weight vinyl, a hydroxy end-terminated polydiethylsiloxane fluid, an organohydrogensiloxane fluid, a platinum catalyst, and optionally a platinum catalyst inhibitor. The triorganosiloxy endblocked polydimethylsiloxane fluid has a major peak molecular weight of 68,000 to 135,000, a dispersity index greater than 3.8, the lowest molecular weight species between 854 and 3146 and the highest molecular weight species between 174,000 and 370,000. These compositions are readily extrudable under low pressure, have improved pot-life, cure to high strength elastomers with a high durometer, and have improved mold release.

Abstract: Silicone oil-silica filler paste is provided which can be used in liquid injection molding applications. The silicone paste is made by blend reinforcing silica filler with silicone oil while it is refrigerated to produce a material having an improved application rate.

Abstract: The silicone rubber composition of the present invention comprises (A) an organopolysiloxane obtained by mixing and heating an organopolysiloxane having a silanol group at both ends of the molecular chain and a silane or a siloxane having two hydrolyzable groups in the molecule, (B) a finely divided silica, and (C) a curing agent. The composition, wherein the content of low-molecule siloxanes is remarkably constrained, is quite useful in the application wherein low-molecular siloxanes are obnoxious, for example, in the application of electrical contacts and parts used adjacent thereto, roll materials of copying machines, gaskets for construction, etc.

Abstract: The present invention relates to a method for making nitrosamine-free silicone articles by treating the mixture of vinyl containing organopolysiloxane and filler with hindered phenols, a nitrosamine-free composition and a nitrosamine-free article made therefrom. A preferred nitrosamine-free molded article is a baby bottle nipple.

Abstract: A soft, tacky polysiloxane elastomer characterized as having: a tackiness of 10-450 grams as determined by a polyken probe tack tester or 0-10 cm (0-4 inches) as determined by a rolling ball tack tester and a tensile strength of 0.14-5.52 mega Pascals (20-800 pounds/square inch), a minimum elongation of 250-1100 percent and a tear strength of 0.88-35.2 kN/m (5-200 pound/square inch) The soft, tacky elastomer can be made into various cushioning devices, with or without a topcover. Representative cushioning devices include an arch support pad, a metatarsal pad, a heel cushion, sheet padding, a full-length insole, a three quarter length insole, a half insole, a toe-crest pad, a heel liner, an elbow pad, a corn pad, a callus pad, a blister pad, a bunion pad or a toe pad.

Abstract: An aqueous silicone coating composition containing a reactive siloxane polymer and a non-reactive dimethylpolysiloxane in an aqueous carrier having an effective amount of at least one dispersing agent to disperse the siloxanes throughout the aqueous carrier. Also provided is a method of lubricating substrates by applying an aqueous silicone coating composition to the substrate and curing the silicone thereon, as well as lubricated surgical needles prepared by that method.

Abstract: A silicone gel composition comprising (A) a linear organopolysiloxane having a backbone consisting only of trifluoropropyl-substituted siloxane units and terminated with alkenyl group, (B) an organohydrogenpolysiloxane, (C) a platinum catalyst, and (D) a finely powdered silica whose surfaces have been rendered hydrophobic by treatment with a silicon compound having only methyl groups as substituent groups, such as hexamethyldisilazane, trimethylchlorosilane, dimethyldichlorosilane, methyltrichlorosilane, trimethylalkoxysilane, dimethyldialkoxysilane, methyltrialkoxysilane and cyclic or linear dimethylpolysiloxanes. The composition has good thixotropy and can effectively provide a protective layer by spot potting. The silicone gel formed from the composition is excellent in solvent resistance, etc. and is effectively restrained from shrinkage or the like. Therefore the composition is highly suited to use as a protective material for semiconductor-type pressure sensors.

Abstract: A silicone composition is of the addition reaction type which comprises a vinyl group-containing organopolysiloxane, an organohydrogenpolysiloxane which has at least one hydrogen atom joined to a silicon atom in one molecule, a platinum group metal catalyst, and an aluminum oxide powder which is substantially round or spherical in shape with an average particle size of not larger than 50 .mu.m and wherein when the aluminum oxide powder is subjected to extraction of alkali metal ions and halogen ions under conditions of 121.degree. C., 2 atmospheric pressures, 100% R.H. and 20 hours, the contents of both ions are, respectively, not larger than 5 ppm. The cured product obtained from the composition has high thermal conductivity and the composition is useful as a sealant of electric and electronic parts and can prevent the parts from being corroded.

Abstract: An improved process is provided for the preparation of siloxane-oxyalkylene block copolymer surfactant compositions which utilize a hydrosilylation reaction with a phenyl ether as the reaction solvent and the use of a phenyl ether as a cold blend additive. Ethylene glycol phenyl ether is the preferred reaction solvent or cold blend additive.

Abstract: A heat curable silicone elastomer composition includes (1) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups, (2) an organohydrogenpolysiloxane having at least two hydrogen atoms, and (3) a platinum-containing silicone resin having a melting or softening point of 49.degree. to 150.degree. C. and containing 0.05-0.3 mol % of SiOH group. The composition is storage stable at room temperature and efficiently cures through hydrosilylation reaction at high temperature.

Abstract: A curable silicone rubber composition contains (A) an organopolysiloxane raw rubber containing 0.01-1% by weight of vinyl and having a viscosity of 10.sup.3 -10.sup.6 poise at 25.degree. C., (B) an organopolysiloxane oil containing 0.1-10% by weight of vinyl and having a viscosity of 0.05-100 poise at 25.degree. C., (C) an organopolysiloxane copolymer composed mainly of a triorganosiloxy unit (M) and SiO.sub.2 unit (Q) in a molar ratio (M/Q) between 0.6 and 1.2 and containing 0.1-10% by weight of vinyl, (D) an organohydrogensiloxane containing at least three silylidyne groups, (E) a platinum catalyst, and (F) finely divided silica as essential components. The composition is hot air vulcanizable into a silicone rubber which is improved in hardness, modulus, tear strength and compression set.

Abstract: An insulator includes a housing portion. The housing portion is composed a silicone rubber obtained by curing a composition containing diorganopolysiloxane (A) and a fine silicon powder (B) by heating, and a methylalkylpolysiloxane oil (C). The diorganopolysiloxane has at least two silicon atom-bonded alkenyl groups in one molecule. The methylalkyl-polysiloxane oil (C) has each of both terminal ends of each molecular chain blocked with a trialkysiloxy group and possessing a viscosity at 25.degree. C. being 1 to 1,000 centistokes, and is incorporated into the above composition in an amount of 1-100 parts by weight per 100 parts by weight of the component (A).

Abstract: To a silicone composition comprising (A) an organopolysiloxane having at least two alkenyl groups in a molecule, (B) an organohydrogenpolysiloxane having at least two hydrogen atoms each directly attached to a silicon atom in a molecule, and (C) a platinum catalyst, (D) a compound having a phenyl group and a secondary or tertiary amino group directly attached thereto is added to render the composition flame retardant. The composition cures into a transparent product having improved flame retardancy meeting the UL standard and is suitable for use in the protection of electronic parts like ICs and hybrid ICs.

Abstract: Adhesion-promoting additives for use in curable organosiloxane compositions comprise 1) at least one organosiloxane comprising a) silicon bonded hydrogen atoms and/or ethylenically unsaturated substituents bonded to silicon through carbon and b) at least one silicon atom containing three hydrolyzable groups, and 2) at least one silane containing four alkoxy or enoloxy groups or three of these groups and a hydrocarbon radical containing an epoxy or ethylenically unsaturated group as a substituent.

Abstract: A reactive component, which is curable to form a nonpolar polymer containing silicon and carbon atoms, and having a glass transition temperature of at least 20.degree. C., is mixed with an antiplasticizer. The resulting mixture, a curable composition, is cured to form a composition having an increased modulus. The reactive component preferably comprises a polyene having at least two hydrosilation reactive carbon-carbon double bonds (e.g., dicyclopentadiene), and a silicon compound having at least two hydrosilation reactive .ident.SiH groups. Preferably the silicon compound comprising at least one member selected from the group consisting of cyclic polysiloxanes, tetrahedral siloxysilanes, and linear polysiloxanes. Preferably the resulting cured composition is crosslinked, due to at least one member selected from the group consisting of the polyene and the silicon compound having more than two hydrosilation reactive sites. Preferably the curable composition further comprises a hydrosilation catalyst.

Abstract: A process for preparing a liquid silicone rubber base composition of the type which comprises (A) an organopolysiloxane of the following average compositional formula (1)R.sub.a SiO.sub.(4-a)/2 (1)wherein each R independently represents an unsubstituted or substituted monovalent hydrocarbon group and a is a value of from 1.95 to 2.05, and (B) a finely divided silica filler is described. The process comprises the steps of mixing a first portion of the ingredient (A) and the ingredient (B) at a temperature not higher than 80.degree. C., further mixing a second portion of the ingredient (A) with the mixture obtained in the first step at a temperature not higher than 80.degree. C. and subjecting the resultant mixture to thermal treatment at a temperature of 130.degree. to 200.degree. C. By this, the base composition has good fluidity and is able to yield a cured product having good tear strength under stress.

Abstract: A process for preparing a liquid silicone composition of the type which comprises (A) a diorganopolysiloxane having a viscosity of 1000 to 100,000 centipoises and having at least two reactive groups, (B) a filler mainly composed of SiO.sub.2 having a specific surface area of not smaller than 50 m.sup.2 /g, (C) a diorganopolysiloxane having a viscosity of from 10 to 1000 centipoises and substantially free of any terminal silanol group, (D) hexamethyldisilazane and/or (E) water is described. In the process, 10 to 100 wt % of the (A) and (C) components and 100% of the (B), (D) and, if present, (E) components are mixed under heating conditions of 100.degree. to 250.degree. C. for a time sufficient to obtain a uniform dispersion. If present, the balances of the (A) and (C) components are subsequently mixed with the dispersion.

Abstract: Optically clear, reinforced cross-linked silicone elastomers of the invention contain 12 to 18 mol percent of aryl substituted siloxane units of the formula R.sub.4 R.sub.5 -SiO, end blockers containing silioxane units of the formula R.sub.1 R.sub.2 R.sub.3 -S:O.sub.0.5, and dialkyl siloxane units of the formula R.sub.6 R.sub.7 -SiO. R.sub.1 and .sub.2 are alkyl, aryl or substituted alkyl or substituted aryl groups, and R.sub.3 is an alkenyl group. R.sub.4 and R.sub.5 are phenyl or mono lower alkyl substituted phenyl groups. R.sub.6 and R.sub.7 are methyl or ethyl groups. The polymer has a degree of polymerization between 100 to 2000, and preferably approximately 250. The polymer also contains trimethyl silyl treated silica as a reinforcer in the weight ration of approximately 15 to 45 parts of reinforcer to 100 parts of the polymer. After cross-linking, the polymer has properties of an optical refractive index which is at least 1.

Abstract: A heat-curable silicone elastomer composition comprising (A) a thermoplastic resin containing a platinum catalyst and a hydrosilylation reaction retarding agent, (B) an organopolysiloxane having at least two unsaturated aliphatic hydrocarbon groups bonded to silicon atoms in its molecule, and (C) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in its molecule. The composition is excellent in storage stability. That is, even when stored for a long time, the composition has good stability at room temperature and retains curability at high temperatures.

Abstract: Room temperature vulcanizable platinum group metal catalyzed silicone compositions are provided which utilize an N-heterocyclic adhesion promoter, such as 2,6 bis(trimethoxysilyltrimethyleneoxy)pyridine. Cohesive bonding is effected on various substrates.

Abstract: A release modifier which comprises (i) a MQ resin consisting essentially of units of the formulae SiO.sub.2 and R.sub.3 SiO.sub.1/2 wherein R denotes a monovalent hydrocarbon group having up to 3 carbon atoms, a hydrogen atom, a c.sub.2-5 alkenyl group of the formula --R'CH.dbd.CH.sub.2, provided there is at least one group --R'CH.dbd.CH.sub.2 present per MQ molecule and (ii) a .alpha.,.omega.-diolefin having the general formula CH.sub.2 .dbd.CH--(CH.sub.2).sub.n --CH.dbd.CH.sub.2, wherein n denotes an integer with a value of from 4 to 18 gives improved release force over prior art controlled release additives. Also claimed is a solventless release composition based on siloxanes having SiH groups and a catalyst in addition to the release modifier.

Abstract: Disclosed are flame retardant organosilicon compositions, wherein the organosilicon compositions comprise residues derived from (a) polycyclic polyene compounds and (b) residues derived from cyclic polysiloxanes, tetrahedral siloxysilanes and linear poly(organohydrosilioxane)s. Preferably the compositions contain flame retardants, such as a phosphorus containing or halogen containing flame retardant, which may be microencapsulated. Also disclosed are processes for making such compositions and articles made from such compositions.

Abstract: Disclosed are flame retardant organosilicon compositions, wherein the organosilicon compositions comprise residues derived from (a) polycyclic polyene compounds and (b) residues derived from cyclic polysiloxanes, tetrahedral siloxysilanes and linear poly(organohydrosiloxane)s. Preferably the compositions contain flame retardants, such as a phosphorus containing or halogen containing flame retardant, which may be microencapsulated. Also disclosed are processes for making such compositions and articles made from such compositions.

Abstract: A liquid curable composition prepared from a polydiorganosiloxane having ethylenically unsaturation, a polyhydrogenorganosiloxane, a catalyst for the addition of silicon-bonded hydrogen to ethylenically unsaturation, a particulate filler wherein the composition cured to an elastomeric state has a loss modulus, E", of at least 100 MPa at -120.degree. C., a loss tangent of at least 0.15 at -120.degree. C., and a tear strength of less than 10 kN/m at 23.degree. C., makes an interlayer for a laminate of glass or other brittle which fails safely when receiving a breaking impact.

Abstract: Unique silicone adhesion modifiers well suited for formulation into curable release compositions containing a linear polydiorganosiloxane, comprise an organopolysiloxane resin (A) containing at least 0.1 mol % of alkenyl or alkenyloxyalkylene radicals directly bonded to silicon atoms, an organopolysiloxane resin (B) containing at least 0.5 mol % of hydrogen atoms directly bonded to silicon atoms, and a solvent/diluent (C) for the resins (A) and (B).

Abstract: Organosiloxane compositions curable to optically clear, high refractive index elastomers are disclosed. The cured compositions have superior post-folding high resolution recovery making them suitable for fabricating foldable intraocular lenses used in small-incision ophthalmic surgeries. The organosiloxane compositions include first and second vinyl terminated organosiloxanes differing in molecular weights, each containing diphenylsiloxane and dimethylsiloxane, and, in addition, fumed silica, a crosslinking reagent, a platinum containing catalyst, and optionally an ultraviolet absorbing compound.

Abstract: An adhesive silicone composition comprising (A) an alkenyl group-containing organopolysiloxane, (B) an organohydrogen-polysiloxane having at least three hydrogen atoms each directly bonded to a silicon atom in a molecule, (C) a compound having at least one aliphatic unsaturated group and at least two phenyl skeletons in a molecule, and (D) a platinum catalyst is well adhesive to both metals and reins, and even to difficult-to-adhere resins such as nylon, polycarbonate and acryl resins.

Abstract: The introduction of a room-temperature-curable organopolysiloxane composition that cures at room temperature to give a rubber whose surface is easily coated with paint and from which the resulting paint film does not delaminate readily and that after curing is free from staining of the surface of the rubber and any substrates in contact with the rubber.

Abstract: An improved process is provided for the preparation of siloxane-oxyalkylene block copolymer surfactant compositions which utilize a hydrosilylation reaction with a phenyl ether as the reaction solvent. The reaction solvent need not be removed from the block copolymer, particularly when the block copolymer is used as a surfactant for polyurethane foam formulations. Ethylene glycol phenyl ether is the preferred reaction solvent.

Abstract: Adhesion promoting compositions for bonding a layer of organic polymer to a layer of organosiloxane elastomer during curing of the elastomer by a platinum group metal-catalyzed hydrosilation reaction comprise (a) a copolymer containing repeating units derived from at least one ethylenically unsaturated organic compound and at least one silane containing an ethylenically unsaturated organic group and at least two silicon-bonded hydrolyzable groups per molecule, and (b) an organohydrogensiloxane containing an average of at least three silicon-bonded hydrogen atoms per molecule. If the adhesion promoting composition is to be used with an elastomer prepared by curing an organosiloxane elastomer at temperatures below about 80 degrees C., the adhesion promoting composition includes an alkyl orthosilicate and an organotitanium compound.

Abstract: An adhesive silicone rubber composition of addition reaction curing type comprising (a) an organopolysiloxane containing an alkenyl group; (b) an organohydrogenpolysiloxane having at least one hydrogen atom directly attached to a silicon atom in a molecule; (c) an addition reaction catalyst; and (d) an adhesive agent selected from compounds of the following formulae (I), (II) and (III):A-(D-B).sub.x -D-A (I)C-(B-D).sub.

Abstract: The present invention relates to a transparent material based on addition-crosslinking polysiloxanes, which is used as occlusal print for molding side teeth composites.