Abstract: Asymmetric aryl polyhedral oligomeric silsesquioxanes (ArPoss) compounds synthesized by the “corner-capping” of phenyl7Si7O9(OH)3 with aryl trichlorosilanes are described. The ArPoss compounds have the chemical structure: wherein Ph is phenyl and wherein R is selected from the group consisting of: and mixtures thereof.

Abstract: Novel POSS mono- and dianiline compounds, their synthesis procedures, and applications in host materials for the purposes of property enhancement are described. This class of POSS compounds features completely aromatic peripheries and partial amine functionality for facile and controlled reactive incorporation into a variety of polymers, and further utility may be derived from reactions of the available amine groups with anhydrides such as phenylethynyl phthalic anhydride (PEPA) to form reactive imide-type oligomers for incorporation into high performance thermosetting polymers. Modification of polymer hosts with the subject nanoparticles can result in a variety of property improvements including mechanical, thermal, tribological, electrical, as well as improved moisture resistance.

Abstract: Embodiments of the invention are directed to the preparation of a discrete cyclosiloxane or a discrete mixture of cyclosiloxanes where a dihydroxysilane or dihydroxysiloxane condenses with a dihydrosilane or dihydroxysiloxane in the presence of a Lewis acid catalyst in a reaction phase including a solvent. The introduction of the dihydroxysilane or dihydroxysiloxane and dihydrosilane or dihydroxysiloxane is controlled such that the cyclocondensation occurs in a reaction phase that is dilute in the SiH and SiOH functionality permitting the isolation of the monocyclocondensation adduct in high yield with little higher molecular weight condensation products. In one embodiment of the invention 1,1-diphenyl-3,3,5,5-tetramethylcyclotrisiloxane is prepared in very high yield.

Abstract: A siloxane compound comprises a plurality of siloxane repeating units and at least a portion of the siloxane repeating units are cyclosiloxane repeating units conforming to a specified structure. A process for producing such siloxane compounds is also provided. A process and kit for producing a cross-linked silicone polymer using the described siloxane compounds is also provided. A light emitting diode (LED) comprises an encapsulant, and the encapsulant comprises a cross-linked silicone polymer produced from the described siloxane compounds.

Abstract: A siloxane compound comprises a plurality of siloxane repeating units and at least a portion of the siloxane repeating units are cyclosiloxane repeating units conforming to a specified structure. A process for producing such siloxane compounds is also provided. A process and kit for producing a cross-linked silicone polymer using the described siloxane compounds is also provided. A light emitting diode (LED) comprises an encapsulant, and the encapsulant comprises a cross-linked silicone polymer produced from the described siloxane compounds.

Abstract: A siloxane compound comprises a plurality of siloxane repeating units and at least a portion of the siloxane repeating units are cyclosiloxane repeating units conforming to a specified structure. A process for producing such siloxane compounds is also provided. A process and kit for producing a cross-linked silicone polymer using the described siloxane compounds is also provided. A light emitting diode (LED) comprises an encapsulant, and the encapsulant comprises a cross-linked silicone polymer produced from the described siloxane compounds.

Abstract: A composition containing a metal compound and a siloxane compound (A) represented by general formula (1): wherein X is represented by general formula X1 or X2: wherein the number of X1 is 1-8; the number of X2 is 0-7; the sum of the number of X1 and the number of X2 is 8; R1 to R4 represent a hydrogen atom, a C1-8 alkyl group, alkenyl group, alkynyl group, or a C6-8 aryl group, a hydrogen atom thereof optionally being substituted by a fluorine atom; R5 represents a C1-18 alkyl group, alkenyl group, alkynyl group or aryl group, a hydrogen atom thereof being optionally substituted by a fluorine atom, a carbon atom being optionally substituted by an oxygen atom or a nitrogen atom; R6 represents a hydrogen atom, a vinyl group or an allyl group; m and n represent an integer of 1-4; and 3?m+n.

Abstract: A method of forming a silsesquioxane/Q/siloxane polymer or oligomer system used to form coatings or monoliths, includes the step of mixing silsesquioxane, siloxane and alkoxysilane components having structures as presented below in ratios as presented below with a soluble F? catalyst and water in a suitable solvent so that on stirring at temperatures of ?20° to approximately 100° C. all of the components dissolve producing a solution. A soluble oligomer is formed in equilibribum with single molecules with specific structures including [RSiO1.5]x[R?MeSiO]y[R?Me2SiOSiO1.5]z (where R?R? or R? or R1 or R2 as denoted below) and where x, y and z are mole fractions whose sum is equal to one.

Abstract: A siloxane compound according to the present invention is represented by the general formula (1): where X are each independently either X1 or X2 with the proviso that at least one of X is X1; R1 to R8 are each independently a hydrogen atom, a C1-C8 alkyl, alkenyl or alkynyl group, a phenyl group or a pyridyl group; each of R1 to R5 may have a carbon atom replaced by an oxygen atom and may have an ether bond, a carbonyl group or an ester bond in its structure; m is an integer of 3 to 8; n is an integer of 0 to 9; p is 0 or 1; and Y are each independently a cross-linking group. This siloxane compound according to the present invention has higher heat resistance and flowability and easy formability at lower temperatures as compared to conventional silsesquioxanes.

Abstract: The present invention generally relates to water-soluble, highly fluorescent polyhedral oligomeric silsesquioxane (POSS) compounds useful for sensing and bioimaging applications.

Abstract: A new functionalized polyhedral octavinylsilsesquioxanes having the general formula 1, in which R1 denotes: (1) any aryl group other than a non-substituted phenyl or a phenyl substituted in position four with a halogen or the groups-trimethylsilylethynyl, 4,4,5,5-tetramethyl-1,3-dioxaborolane-2-yl, 3 ,4-dimethoxyphenyl, 3?, 5?-bis(methoxycarbonyl)phenyl or benzo[d][1,3]-dioxol-5-yl; (2) any heteroaryl group; or (3) groups including coupled aromatic rings. Additionally, a method to obtain new and known functionalized polyhedral octavinylsilsesquioxanes having the general formula 1, by the silylating coupling of octavinylsilsesquioxane with olefins in the presence of a ruthenium complex catalyst.

Abstract: Embodiments of the invention are directed to the preparation of a discrete cyclosiloxane or a discrete mixture of cyclosiloxanes where a dihydroxysilane or dihydroxysiloxane condenses with a dihydrosilane or dihydroxysiloxane in the presence of a Lewis acid catalyst in a reaction phase including a solvent. The introduction of the dihydroxysilane or dihydroxysiloxane and dihydrosilane or dihydroxysiloxane is controlled such that the cyclocondensation occurs in a reaction phase that is dilute in the SiH and SiOH functionality permitting the isolation of the monocyclocondensation adduct in high yield with little higher molecular weight condensation products. In one embodiment of the invention 1,1-diphenyl-3,3,5,5-tetramethylcyclotrisiloxane is prepared in very high yield.

Abstract: A polysiloxane represented by the formula (1) or (2): where R, R1, R2, m and n are defined in the specification.

Abstract: This invention includes a compound represented by the following structural formula (I) or an acceptable salt thereof.

Abstract: A polysiloxane represented by the formula (1) or (2): where R, R1, R2, m and n are defined in the specification.

Abstract: The invention relates tp dye-functionalized silsesquioxane clusters, a process for their manufacture and their use as colorants, wherein the compounds (functionalized clusters or nano-particles) are characterized by the general formula (I) wherein CAGE is a moiety of the formula (IA) D is a chromophoric moiety, and the other symbols have the meanings as defined in the specification, or salts thereof.

Abstract: The invention provides novel siloxane monomers useful in a variety of adhesive applications. In one aspect, the siloxane compounds described herein can be used as Diels-Alder type curatives for bismaleimide or poly-maleimide monomers. The unsaturated resins shown here are attractive for use as maleimide curatives due to their poly-functionality. Each substituted styrenyl reside can react with two maleimide functional groups. Thus, an invention adhesive composition typically contains an excess of bismaleimide monomers.

Abstract: A primer composition comprising a compound containing an epoxy group, a Si—H group, and an aromatic ring per molecule, and a solvent is effective for assisting in integral molding or bonding a silicone rubber to an adherend of gold, silver or platinum.

Abstract: Functionalized silsesquioxanes containing from 6 to 24 silicon atoms and minimally about 67 mol percent RSiO3/2 moieties where R is a phenyl group bearing a chemically reactive functional group are highly suitable for use as nanoparticles in producing highly ordered nanocomposites of many types, containing a high proportion of interphase. The nanocomposites have unusual physicochemical properties due to the use of uniform, highly functionalized nanoparticles.

Abstract: A mixture of organoalkoxysiloxanes of formula I: wherein R and R″ are identical or different and are methyl, ethyl, vinyl, n-propyl, i-propyl, &ggr;-chloropropyl, n-butyl, i-butyl, n-pentyl, i-pentyl, n-hexyl, i-hexyl, n-heptyl, i-heptyl, n-octyl, i-octyl, hexadecyl, octadecyl or alkoxy, R′ represents methyl or ethyl, n and m are identical or different and each is 0 or an integer ranging from 1 to 20, on the condition that (n+m)≧2, is prepared by: reacting in a first stage the constituents of (i) an organotrichlorosilane or a mixture of organotrichlorosilanes or a mixture of at least one organotrichlorosilane and tetrachlorosilane, (ii) water and (iii) alcohol, combined in a molar ratio (i):(ii):(iii) of 1:(0.59 to 0.95):(0.5 to 100), at a temperature of 0 to 150° C.

Abstract: A process for reducing the level(s) of water and/or other impurities from cyclosiloxanes by either azeotropic distillation, or by contacting the cyclosiloxane compositions with an adsorbent bed material. The purified cyclosiloxane material is useful for forming low-dielectric constant thin films having dielectric constants of less than 3.0, more preferably 2.8 to 2.0.

Abstract: Aromatic silane compounds containing at least an aromatic ring bound directly to the silicon atom, wherein the aromatic ring has at least one substituent located in the ortho position selected from C1-10 hydrocarbon groups, are useful as electron donors in olefin polymerization catalysts for the production of polyolefins having a stereoblock content of from about 7 to about 25%.

Abstract: This invention relates to methods for the preparation of hyperbranched siloxane polymers by anionic polymerization of a cyclotrisiloxane having the functional group Si—OH, and for the preparation of linear siloxane polymers by cationic or anionic polymerization of a cyclotrisiloxane having a vinylterminated functional group. Furthermore, this invention concerns novel cyclotrisiloxanes useful for the preparation of the aforementioned polymers.

Abstract: This invention is a method for the production of a cyclic oligosiloxane, which comprises heating a linear or cyclic polysiloxane in the presence of a metal alkoxide, by which the cyclic oligosiloxane can be produced with high yield by a method having industrially high practical value, because it can carry out the reaction under moderate conditions without causing gelation of the reaction system, in comparison with conventional methods using an alkaline or acidic catalyst.

Abstract: A liquid state non-solvent silicone resin obtained from a polycondensation reaction of material (A) dimethyl poly siloxane, material (B) vinyl methyl cyclo siloxane and material (C) diphenyl dihydroxy silane, the reaction being performed at a temperature within about 140˜180° C. under the presence of an anionic polymerization catalyzer.

Abstract: A process for the preparation of biologically active silicon compounds by hydrolysis of a precursor which produces a compound which prevents the formation of polymers from the silicon hydrolyzed bonds.

Abstract: Method is provided for reacting silsesquioxane resins or polyhedral oligomeric silsesquioxanes (POSS) bearing one or more olefinic groups with strong acids to cleave one or more olefin bonds of the olefinic groups to form POSS species of monomers or polymers having one or more functionalities suitable for reaction with a wide range of polymeric systems, to thus form new POSS derived compounds. Also provided are the new compounds so formed.

Abstract: A synthetic process for the selective preparation of reactive polyhedral oligomeric silsesquioxanes (POSS) as well as polyhedral oligomeric silicate (POS) (spherosilicate) is provided. The method claimed herein employs metal catalyzed metathesis reactions for the selective reaction of .alpha.-olefin containing polyhedral oligomeric silsesquioxanes or silicates with olefinic reagents bearing functionalities useful for grafting reactions, polymerization chemistry and sol-gel processes. The use of metal catalyzed metathesis chemistry to form both linear or network polyhedral silsesquioxane polymers directly from .alpha.-olefin-containing polyhedral oligomeric silsesquioxanes is also described.

Abstract: A synthetic process for the selective preparation of reactive polyhedral oligomeric silsesquioxanes (POSS) as well as polyhedral oligomeric silicate (POS) (spherosilicate) is provided. The inventive process employs the use of metal catalyzed hydrosilylation reactions for the selective reaction of silane containing polyhedral oligomeric silsesquioxanes or silicates with olefinic reagents bearing functionalities useful for grafting reactions, polymerization chemistry and sol-gel processes. The invention also discloses metal-catalyzed hydrosulfidation reactions and metal-catalyzed hydrophosphidation reacttions for functionalization of polycyclic silicones.

Abstract: Chemically stable, perfluorinated, linear or cyclic polyorganosiloxanes (POS), and a process for the preparation thereof. Antifoams, agents for lowering surface tension, dirt repellents, antiadhesives, lubricants, oleophobic and/or hydrophobic agents, coatings and other compositions containing the perfluorinated POS are disclosed.

Abstract: A cosmetic which contains perfluoroalkyl denatured methylphenyl polysiloxane with a structure represented by the following general formula (I): ##STR1## where l, m and n denote average numbers where l is 1-150, m is 1-150 and n is 0-150, a denotes an integer 0-10, and Rf denotes a perfluoroalkyl group with a carbon number of 1-12.

Abstract: A base catalyzed hydrolysis of dialkoxydiphenylsilanes or dialkoxymethylphenylsilanes in a solvent or solvent mixture wherein dialkoxydiphenylsilanes or dialkoxymethylphenylsilanes are soluble but in which octaphenylcyclotetrasiloxane or tetramethyltetraphenyl-cyclotetrasiloxane is sparingly soluble or insoluble provides for a process to prepare octaphenylcyclotetrasiloxane or sym-tetramethyltetraphenyl-cyclotetrasiloxane in high yield.

Abstract: The present invention relates to a process for the manufacture of cyclic polydiorganosiloxanes, especially octamethylcyclotetrasiloxane (D.sub.4) and decamethylcyclopentasiloxane (D.sub.5) by depolymerization of polydiorganosiloxanes in the presence of an initiator, characterized in that the initiator comprises either:1) at least one hydroxide chosen especially from the group made up of caesium, rubidium or quaternary phosphonium hydroxides, or:2) the association of a fluorine-free caesium or rubidium salt, or of a salt of quaternary phosphoniums, with a hydroxyl-containing strong base of an alkali or alkaline-earth metal other than Cs and Rb.

Abstract: Provided is a thermoplastic fluorosilicone resin of the average compositional formula (1):(RfCH.sub.2 CH.sub.2 SiO.sub.3/2).sub.x (C.sub.6 H.sub.5 SiO.sub.3/2).sub.y (SiO.sub.2).sub.z ( 1)wherein Rf is a perfluoroalkyl group having 1 to 10 carbon atoms, and x, y, and z are 0.2.ltoreq.x.ltoreq.0.95, 0<y.ltoreq.0.8, 0.ltoreq.z.ltoreq.0.05, and x+y+z=1 and having a softening point of 50.degree.-200.degree. C. The fluorosilicone resin is useful for microcapsulating a platinum catalyst for prolonging the pot life of an addition type organopolysiloxane composition and can be used as a coating agent for forming a weather resistant, stainproof, water repellent coating.

Abstract: A photosensitive member having stable electrophotographic characteristics can be constituted by an electroconductive support and a photosensitive layer disposed thereon and containing a novel fullerene compound having an organosilicon group as a charge-transporting substance. The fullerene compound may preferably have a polyhedral structure, particularly that of Buckminsterfullerene (C.sub.60) and be represented by the formula: C.sub.60 (A).sub.n . . . (2), wherein A denotes an organosilicon group represented by the formula: ##STR1## (wherein R.sub.1-1 and R.sub.1-2 independently denote a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted silyl group, a substituted or unsubstituted germyl group, a halogen atom, or a group constituting a substituted or unsubstituted ring by a mutual combination of R.sub.1-1 and R.sub.

Abstract: The crosslinkable nematic polyorganosiloxanes are cyclic polyorganosiloxanes containing at least three different mesogenic side groups per polyorganosiloxane, where at least two mesogenic side groups per polyorganosiloxane each contain at least three radicals selected from aromatic, heteroaromatic and cycloaliphatic radicals. They contain a methacrylic or acrylic group in at least one of the mesogenic side groups. The cyclic polyorganosiloxanes have a broad nematic phase and can be readily aligned.

Abstract: Single component inorganic/organic network materials incorporating the physical properties of glasses with the flexibility of organic materials of empirical formula X(SiO.sub.1.5).sub.n wherein X is one or more flexible organic linkages and n is greater than or equal to 2, as well as precursors thereof, are disclosed.

Abstract: The present invention relates to cyclic organosilicon compounds which are viscous liquids at room temperature and have a high surface tension. The present invention also relates to methods of making the cyclic organosilicon compounds which easily produce these compounds in good yields.

Abstract: A method is provided for making silicone fluids having a high refractive index by effecting a hydrosilylation reaction between an arylacetylene such as phenylacetylene and a silicon hydride substrate, such as a cyclic or linear hyridosiloxane in the presence of a platinum catalyst.

Abstract: A method of polymerizing organosiloxane monomers to produce high molecular weight polymers having a relatively narrow range of molecular weights, which includes drying the monomers to a selected moisture content of 10 ppm or less by moisture transfer contact with a desiccant at temperatures below the polymerization temperature prior to polymerization.

Abstract: Cyclic polysiloxanes are produced by continuously passing a feed comprising linear polysiloxanes through a reactor containing a solid acidic catalyst at a pressure greater than one atmosphere under an inert atmosphere to produce a mixture comprising volatile cyclic polysiloxanes, nonvolatile reaction products, and unreacted linear polysiloxanes. The volatile products can then be recovered, and the nonvolatile reaction products and unreacted linear polysiloxanes can be added to the linear polysiloxane feed to form a recycle stream that is passed back through the reactor. Recycling increases the yield of the desired cyclic species.

Abstract: The present invention relates to novel cyclic or linear allylpolysiloxane type silicone fluids having allylalkylsiloxy and diorganosiloxy groups as represented by the formula I and their preparation methods by hydrolyzing mixtures of allyldichlorosilane and diorganodichlorosilane as represented by the formula II and formula III respectively. ##STR1## wherein R is selected from the group consisting of hydrogen alkyl(C.sub.3 -C.sub.20), chloroalkyl, cyanoalkyl, fluoroalkyl, and phenylalkyl group; R.sup.x and R.sup.2 represent independentlhydrogen, methyl or phenyl group; M represents H or SiMe.sub.3 group wherein Me is methyl group and when M is hydrogen, the silanol groups at the both ends of the molecule easily undergo dehydration and cyclize to form the cyclic silicone fluids as represented by the following formula I'; the mixing ratio (x/y) of the compounds as represented in formula I and formula HI respectively can be 1:0.01-1:100; CH.sub.2 CH.sub.2 R.sup.3 of formula II equals to R of formula I or I'.

Abstract: The present invention relates to an improved cracking process for continuously making cyclic siloxanes.

Abstract: This invention pertains to pristine phenylpropylalkylsiloxanes consisting of mixtures of linear and cyclic siloxanes containing the structure ##STR1## and a method for their preparation. The pristine phenylpropylalkylsiloxanes of the instant invention contain no detectable silicon hydride (--SiH), free organics (--C.dbd.C--) or free inorganics. Additionally, the pristine phenylpropylalkylsiloxanes of the instant invention are high refractive index organosilicone polymers.

Abstract: The present invention provides novel silicone compositions comprising phenol-modified branched and cyclic silicones which provide improved low temperature viscosity properties.

Abstract: This invention discloses a method of controlling hydrosilylations in a reaction mixture by controlling the solution concentration of oxygen in the reaction mixture, relative to any platinum present in the reaction mixture. This invention further discloses a method for controlling isomerization in linear or branched alkenyl compounds having at least 4 carbon atoms during a hydrosilylation reaction by introducing a controlled amount of oxygen into the alkenyl compounds during the hydrosilylation. This invention further discloses a method for producing dicycloalkylsubstituted silanes by reacting a halo-or alkoxy-silane with a unsaturated cycloalkenyl compound in the presence of oxygen and a hydrosilylation catalyst.

Abstract: The present invention relates to cyclic siloxanes which have at least one group of formula (1) bonded to a silicon atom--(CH.sub.2).sub.x --R"--[--L--A--].sub.y --(L).sub.z --T (1),in which x is an integer having a value of at least 2, preferably having a value of from 2 to 10, R" is a chemical bond or a divalent radical of the formula --COO--, --OOC--, --CH.sub.2 --CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C--, --N.dbd.N--, --N.dbd.N, --N.dbd.CH--, --CH.dbd.N or --Si(R).sub.

Abstract: Cyclosiloxanes are produced by the acid-catalyzed redistribution of siloxane bonds in polysiloxane fluids at a temperature of about 20-200.degree. C. Little catalyst and no water or solvent is required. Cyclosiloxane product mixtures contain .ltoreq.1 wt. % cyclosiloxane species having more than 18 silicon-oxygen bonds, and .ltoreq.0.5 wt. % cyclosiloxanes having 6 or fewer silicon-oxygen bonds, based upon the weight of the product mixture. The process may be carried out in continuous fashion where redistribution is carried out simultaneously with the stripping of cyclics from the equilibration mixture.

Abstract: Organic polymer additive containing polar functional groups enhances the stability of palladium-containing catalysts for the telomerization of conjugated diolefins in the presence of active hydrogen-containing telomerization agent to produce alpha-substituted alkadienes.

Abstract: An organocyclosiloxane having utility as a coupling agent is disclosed said organocyclosiloxane having the general formula ##STR1## wherein R.sup.1 is independently selected from monovalent hydrocarbon groups having 1 to 8 carbons, R.sup.2 is selected from the group consisting of an alkoxy group and an alkoxysilylalkyl group, R.sup.3 is an organofunctional group selected from the group consisting of glycidoxyalkyl, methacryloxyalkyl, N-(trialkylsilyl)aminoalkyl (hydroxyphenyl)alkyl and haloalkyl x is 1 to 6 and y is 1 to 6, with the proviso that x+y is an integer having a value of 3 to 8.