Abstract: The present invention produces a silicone polymer-filler mixture by passing prescribed quantities of silicone oligomer, filler and polymerization catalyst through a continuous kneader extruder with kneading and polymerization of the silicone oligomer into silicone polymer. A homogeneous silicone polymer-filler mixture is rapidly produced in a single process with low energy consumption.The silicone polymer-filler mixture produced by the present method is useful as a base for diverse silicone rubber compositions, silicone compounds and silicone greases, etc.

Abstract: The invention provides a novel means for providing a highly heat-resistant and corrosion-resistant coating film on the surface of a substrate such as a semiconductor silicon wafer or glass plate by coating the surface with a liquid coating composition which is a solution of an oligomeric organopolysiloxane as a partial dehydration-condensation product of a monohydrocarbylsilane triol RSi(OH).sub.3, optionally, with admixture of a dihydrocarbylsilane diol R.sub.2 Si(OH).sub.2, R being a monovalent hydrocarbon group, e.g. methyl or phenyl, in an organic solvent followed by baking of the coated substrate to convert the coating layer into a cured resin film.

Abstract: A process for the treatment of polyorganosilazanes and/or polyorgano(disilyl)silazanes with an effective quantity of a catalyst system comprising (i) an ionic inorganic salt of the formula M.sup.30 A.sup.-, and (II) a compound capable of complexing with the cation M.sup.+ of the salt. The M.sup.+ cation is a metal ion or a quaternary ammonium ion, and A.sup.- is a compatible anion.The polysilazanes are selected from organopolysilazanes and organopoly(disilyl)silazanes. When treated in this manner, the polysilazanes are characterized by good thermal behavior and can, in particular, be used, after pyrolysis, as precursors of ceramic products.

Abstract: Room temperature-curable organopolysiloxane compositions are made from essentially linear organopolysiloxanes having hydroxyl or hydrolyzable end groups, a crosslinking agent, a filler, optionally a curing catalyst, an unsaturated ester having at least ten carbon atoms in the unsaturated fatty acid component of the ester, and a photosensitizer. These compositions cure to elastomeric materials which do not soil on the surface or the surrounding areas of the substrate in contact with the cure product. The adhesion of these cured products is not reduced.

Abstract: An acid scavenger additive for a one-component, acyloxy-functional RTV composition. The acid scavenger is selected from magnesium materials, zinc materials, and aluminum materials. The acid scavenger prevents a discoloration of the metallic substrate and a decrease in bonding properties of the RTV composition to the substrate on which it is applied.

Abstract: A novel organopolysiloxane is disclosed which has a molecular structure having, in addition to conventional monovalent hydrocarbon groups bonded to the silicone atoms, aminoalkyl groups, e.g. --CH.sub.2).sub.3 NH.sub.2 and --CH.sub.2).sub.3 NH--CH.sub.2 CH.sub.2 --NH.sub.2, and polyoxyalkylene-substituted aminoalkyl groups, e.g. --CH.sub.2).sub.3 NH--CH.sub.2 --CH(OH)--CH.sub.2 --O--C.sub.2 H.sub.4 O).sub.21 (C.sub.3 H.sub.6 O).sub.21 C.sub.8 H.sub.17. The novel organopolysiloxane, which is soluble or emulsifiable in water without using an emulsifying agent, is useful as the principal ingredient of a fabric-finishing composition and capable of imparting very pleasant touch of softness and excellent antistatic performance to the fabric materials treated therewith.

Abstract: Silicone-polyamide block polymers are provided which result from the reaction of lactam and silicone having chemically combined arylacyl or arylisocyanato groups. Silicone having terminal aryllactam groups useful for making silicon-polyamide also are provided.

Abstract: There are provided substantially trialkylsiloxy terminated polysiloxanes having at least one amino or substituted amino group linked to at least one trifunctional siloxy unit of said polysiloxane through an alkylene or arylene bridge. Emulsions of such polysiloxanes as well as methods for treating fabrics therewith are also provided.

Abstract: Novel block copolymers are provided, comprising poly(oxazoline) blocks and polysiloxane blocks. Novel polysiloxane intermediates for preparing such block copolymers are also provided which contain benzyl halide terminal groups. The block copolymers are useful as surface-modifying additives for base polymers.

Abstract: A polysiloxane containing an ethylidene norbornyl group possesses a terminal group represented by the formula: ##STR1## wherein R.sup.1 stands for a monovalent hydrocarbon group, a hydroxyl group, an alkoxy group, or at least one of the hydrocarbon groups represented by Y, and each R.sup.2 stands for the same or different groups selected from the class consisting of hydrogen, monovalent hydrocarbon groups, and a group represented by R.sup.1 wherein R.sup.1 has the same meaning as defined above, and being substantially in the form of a straight chain, 0 to 100 mol %, providing that 100 mol % is excluded where neither of the R.sup.1 's in the terminal groups is a hydrocarbon group represented by Y of the component units being represented by the formula: ##STR2## wherein each R.sup.3 's stand for the same or different groups selected from the class consisting of hydrogen and monovalent hydrocarbon groups and 100 to 0 mol %, providing that 0 mol % is excluded where neither of the R.sup.

Abstract: A process for the neutralization of the alkali metal catalyst in a polymerized organopolysiloxane where the alkali metal content of the resulting organopolysiloxane is significantly reduced, is described. The process consists of neutralizing the alkali metal salt with a straight-chain carboxylic acid of general formula ZCOOH, where Z is a hydrocarbon group containing at least two carbon atoms, and thereafter filtering the organopolysiloxane. The same ZCOOH carboxylic acids may be added to organopolysiloxanes which have previously been neutralized with either carbon dioxide or acetic acid in order to significantly reduce the alkali metal content of the organopolysiloxane after filtration. Organopolysiloxanes containing less than 0.5 ppm K.sup.+ can be easily obtained.

Abstract: Photo-curable vinyloxy-functional organosiloxane polymers are provided. Also provided are release coating compositions made by combining said polymers with various photo-initiators. The polymers have a unique vinyloxy functionality; and the release coating compositions cure with brief exposure to ultraviolet radiation to form premium abhesive coatings. Process for preparing the vinyloxy-functional polysiloxanes and the release coating are also disclosed.

Abstract: Disclosed is a composition comprising (A) a silicon-containing resin having in a molecule thereof at least one silicon atom connected to a hydrolyzable group and/or a hydroxyl group, and (B) a cure promoting catalyst system for the silicon-containing resin. The catalyst system comprises a compound containing a fluoride ion. Also disclosed is a composition comprising such a silicon-containing resin, and a catalyst system comprising a compound containing a fluoride ion in combination with an organotin compound.

Abstract: Radiation polymerizable acrylate-functional organopolysiloxanes having the formula ##STR1## where R is a radical selected from monovalent hydrocarbon radicals, substituted monovalent hydrocarbon radicals having from 1 to 20 carbon atoms or monovalent hydrocarbonoxy radicals having from 1 to 20 carbon atoms, or a radical of the formula ##STR2## in which at least one R is a radical having the above formula, R.sup.1 is a divalent radical selected from a saturated divalent hydrocarbon radical having up to 20 carbon atoms, a divalent hydrocarbonoxy radical in which the oxygen is in the form of an ether linkage and an unsaturated divalent hydrocarbon radical having from 3 to 10 carbon atoms; R.sup.2 is hydrogen or a methyl radical; R.sup.3 is a linear or branched radical having 2, 3, 4, 5 or 6 valences in which the radical is selected from a substituted hydrocarbon radical, or a hydrocarbon ether or thioether radical having one or more repeating units and the terminal atoms of the R.sup.

Abstract: Crosslinkable polyamide blends are provided of lactam, a silicon substituted lactam and a base polymerization catalyst. The crosslinkable blends can be reinforced and converted to polyamide parts by standard molding techniques.

Abstract: A method is provided for making polyamides and silicone polyamide block and graft polymers by heating a mixture of a lactam in the presence of a silicon containing material, such as a silyl lactam, and a mixture of fluoride ion catalyst and a promoter such as an organic isocyanate. The resulting polyamides or silicon polyamide block or graft polymers can be utilized to make silicone elastomeric adhesives or injection moldable polyamides.

Abstract: Vinyl-containing polysilanes of the average formula[R.sub.2 Si][RSi][R.sub.d '(CH.sub.2 .dbd.CH)Si]where R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical, or a phenyl radical, d is 1 or 2 and where the polysilane contains 0 to 60 mole percent [R.sub.2 Si] units, 30 to 99.5 mole percent [RSi] units, and 0.5 to 15 mole percent [R.sub.d '(CH.sub.2 .dbd.CH)Si] units are disclosed. The vinyl-containing polysilanes may be converted to silicon carbide-containing ceramics by pyrolysis in an inert atmosphere or in a vacuum at temperatures greater than 800.degree. C. Shaped articles prepared from the vinyl-containing polysilanes may be rendered infusible prior to pyrolysis by exposure to air or ultraviolet light.

Abstract: An organosilicon polymer whose main-chain skeleton is composed mainly of following structural units (A), (B), (C), (D), (E) and (F) ##STR1## wherein R represents CH.sub.3 or H, said structural units forming linear, branched and cyclic structures, and said main-chain skeleton further having a polysilane skeleton ##STR2## (2.ltoreq.n.ltoreq.10). The said organosilicon polymer can be produced by adding at least one anhydrous metal halide to a polysilane having the structure ##STR3## the amount of the metal halide being 0.5 to 10% by weight based on the weight of the polysilane; and heating the mixture in an atmosphere inert to the reaction.

Abstract: Siloxane modified isocyanurate polymers are disclosed which are the reaction product of a siloxane containing polyahl and a polyisocyanate in the presence of a catalyst for a trimerization of the isocyanate to form isocyanurate rings.

Abstract: A liquid silicone rubber composition comprising (A) an organopolysiloxane containing epoxy groups, (B) an organopolysiloxane containing amino groups and (C) a curing catalyst for epoxy compounds is proposed in which the compounding ratio of the component (A) to the component (B) is in the range of from 0.2 to 5.0 relative to the epoxy/amino molar ratio and which further contains optionally an organic solvent such as xylene and a silica flour. The composition is cured rapidly without the problem of catalyst poisoning even at room temperatures to be converted into a cured article with low volume resistivity and excellent antistatic performance as well as surface releasability. The composition is useful as casting materials, electric insulating materials, paint vehicles, coating materials, molding compositions and the like.

Abstract: The subject of the present invention is a process for the preparation of polydiorganosiloxanes containing hydroxyaryloxy terminal groups by reacting polydiorganosiloxanes containing bis-acyloxy terminal groups with diphenols in a molar ratio of 1:2 to 1:20.

Abstract: This invention relates to a process for the preparation of polysiloxanes by reacting halosilanes in the presence of metal oxides and sulfolane. Preferred metal oxides include antimony (III) oxide, antimony (V) oxide, cadmium oxide, calcium oxide, copper (II) oxide, indium oxide, iron (II) oxide, iron (III) oxide, magnesium oxide, manganese (II) oxide, mercury (II) oxide, nickel (II) oxide, thallium (III) oxide, tin (II) oxide, and zinc oxide. Improved yields and rates of reaction can be observed with the process of this invention.

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

Abstract: The invention provides a novel method for the neutralization of the residual alkali catalyst following alkali-catalyzed polymerization of an organopolysiloxane oligomer to produce a high-polymeric organopolysiloxane, according to which the organopolysiloxane after completion of the polymerization reaction is admixed with a trihydrocarbyl monohalosilane, e.g. trimethyl chlorosilane, and a hexahydrocarbyl disilazane, e.g. hexamethyl disilazane, in combination as the neutralizing agent so that the neutralization is very complete and still the product organopolysiloxane contains very little impurities of alkali and halogen.

Abstract: Polysiloxanes produced by polymerizing a monomeric silane in the presence of an organo metallic catalyst and the use of the polysiloxanes to react with alkylene-alkyl acrylate copolymers to produce silane modified, water curable polymers.

Abstract: A process for the continuous polymerization of polydiorganosiloxanes comprising:(a) mixing one or more cyclopolysiloxane monomers with one or more chainstopping agents,(b) preheating the mixture resulting from (a),(c) adding to the preheated mixture of (b) an amount of catalyst effective for catalyzing a polymerization reaction,(d) polymerizing the catalyzed mixture of (c) in a screw extruder having essentially plug flow therethrough, and(e) adding to the resulting polymer an amount of neutralizing agent effective for neutralizing said catalyst.

Abstract: Vinyl-containing polysilanes of the average formula[R.sub.2 Si][RSi][R.sub.d.sup.' (CH.sub.2 .dbd.CH)Si]where R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical, or a phenyl radical, d is 1 or 2 and where the polysilane contains 0 to 60 mole percent [R.sub.2 Si] units, 30 to 99.5 mole percent [RSi] units, and 0.5 to 15 mole percent [R.sub.d.sup.' (CH.sub.2 .dbd.CH)Si] units are disclosed. The vinyl-containing polysilanes may be converted to silicon carbide-containing ceramics by pyrolysis in an inert atmosphere or in a vacuum at temperatures greater than 800.degree. C. Shaped articles prepared from the vinyl-containing polysilanes may be rendered infusible prior to pyrolysis by exposure to air or ultraviolet light.

Abstract: Organopolysiloxane compositions which rapidly harden to the elastomeric state, even at ambient temperatures, are comprised of (i) a polyhydroxylated polysiloxane, (ii) a polyacyloxysilane cross-linking agent therefor, and (iii) a hardening accelerator comprising an alkali or alkaline earth metal hydroxide. The subject compositions are useful, inter alia, for providing elastomeric seals.

Abstract: Polyorganosiloxanes that are curable to crosslinked solid material, at ambient temperature upon exposure to gaseous oxygen, wherein the polyorganosiloxane contains, per molecule, at least one monovalent olefinically polyunsaturated organic radical containing at least one 1,3-pentadienylene group or 1,4-pentadienylene group bonded to silicon through silicon-to-carbon bond and wherein any remaining valence of silicon is satisfied by a silicon-to-oxygen-to-silicon bond or by a monovalent organic radical free of more than one olefinically unsaturated group per monovalent organic radical, which monovalent organic radical is bonded to silicon by a silicon-to-carbon bond. Compositions are also described containing the novel polyorganosiloxanes, suitable driers either chemically combined in the polyorganosiloxane or physically mixed therewith. The compositions can also contain fillers, plasticizers and/or catalyst activators.

Abstract: Aliphatic aldehyde polymer containing at least one Si atom in its molecular chain is a positive type resist having a very high sensitivity to radiation such as electron beams, X-rays, ion beams, etc.

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 method of polishing an electrophotographic photoconductive member, which comprises polishing said surface with polishing particles selected from the group consisting of solid organic polishing particles composed of a polysilsesquioxane having, on its silicon atoms, substituents selected from a lower alkyl group having 2 to 5 carbon atoms, an alkoxy group, an aryl group and an aralkyl group; a combination of said solid organic polishing particles and solid inorganic polishing particles; and a combination of solid organic polishing particles composed of polymethylsilsesquioxane and solid inorganic polishing particles.

Abstract: A process for preparing a trifluorovinylsilane represented by the general formula:(CF.sub.2 .dbd.CF).sub.n SiR.sub.4-n (I)where each R independently represents an alkyl group, an aryl group or an aralkyl group, and n is an integer of 1 to 4, which comprises the reaction of chlorotrifluoroethylene with a chlorosilane represented by the general formula:Cl.sub.n SiR.sub.4-n (II)where R and n are as defined above, in the presence of an alkyllithium. Also disclosed is a fluorine-containing polymer represented by the general formula: ##STR1## where each of x and m is an integer other than O, y is an integer including O, and each of R.sup.1, R.sup.2 and R.sup.3 is a lower alkyl group, an aryl group or an aralkyl group, which is prepared by polymerization of a trifluorovinyl silane (I) with active fluoride-ion generating catalyst.

Abstract: A silicone resin comprising 100 parts by weight alkylsiloxane units selected from the group consisting of RSiO.sub.1.5 units and R.sup.1 R.sup.2 SiO units and mixtures thereof, wherein R, R.sup.1 and R.sup.2 are independently selected alkyl radicals having from 1 to about 8 carbon atoms, and from about 75 to about 2100 parts by weight .beta.-phenylethylsiloxane units of the formula ##STR1## so as to provide a silicone resin which exhibits increased reactivity with organic compositions and which provides ultraviolet light and weathering resistance.

Abstract: A novel branched hydrosilyl-modified polycarbosilane which can be pyrolized to obtain improved yields of silicon carbide. This novel branched hydrosilyl-modified polycarbosilane can be prepared in a one-step reaction from mixtures of silane monomers containing vinyl or halomethyl moieties with silane monomers containing hydrosilyl groups.

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 silicone composition, before curing, a small effective amount of an adhesion promoting composition comprising predominantly at least one diorganocyclopolysiloxane compound of the formula: ##STR1## wherein R.sup.1 may be C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 gamma-trihaloalkyl or phenyl; R.sup.2 is alkylene of from 2 to 6 carbon atoms; R.sup.3, R.sup.4 and R.sup.5 are, independently, C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkanoyl; and n is either 3 or 4.

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 an organometallic copolymer composed of a polycarbosilane portion and a polymetallosiloxane portion crosslinked with each other, which comprises reacting (1) a polycarbosilane having a main chain skeleton composed mainly of carbosilane units of the formula --Si--CH.sub.2 --, with (2) a polymetallosiloxane having a main chain skeleton composed of metalloxane units of the formula --M--O-- wherein M represents Ti or Zr and siloxane units of the formula --Si--O--, in an organic solvent in an inert atmosphere thereby to bond at least some of the silicon atoms of said polycarbosilane to at least some of the metal atoms M and/or silicon atoms of said polymetallosiloxane through an oxygen atom; and the organometallic copolymer obtained by the aforesaid process.

Abstract: The present invention relates to a process for the preparation of trioganosilyl-terminated polydiorganosiloxanes by basic polymerization of cyclic diorganopolysiloxanes and triorganosilyl-terminated siloxanes, wherein, before the polymerization, a part of the cyclic diorganosiloxane is distilled off in the presence of the polymerization catalyst at a temperature which is at least 10.degree. C. below the polymerization temperature.

Abstract: Polymeric complex compounds of molybdenum, tungsten, manganese, rhenium and of the metals of the sub-groups VIII and I of the Periodic Table of Elements, which complex compounds have a silica-type structure are disclosed. At least one amine ##STR1## is bonded coordinately to the central metal atom. The atomic ratio of metal to nitrogen is from 1:1 to 1:10.sup.6. The required charge compensation is effected by means of an anion. In (1), R.sup.1 and R.sup.2 represent a group ##STR2## and R.sup.4 is an alkylene grouping. The oxygen atoms are saturated by silicon atoms of further groups (2), if appropriate with incorporation of crosslinking agents. R.sup.3 may have the meaning of R.sup.1 and R.sup.2, or represents hydrogen, an alkyl group, a cycloalkyl group or the benzyl group. The polymers can contain several metals. The invention also relates to processes for their preparation, and uses in catalysis.

Abstract: A process for preparing organopolysiloxanes having SiC-bonded organofunctional groups, which comprises reacting an organopolysiloxane containing SiC-bonded hydroxyl and/or alkoxy groups and having an average of about 0.85 to 1.8 SiC-bonded monovalent hydrocarbon radicals or halogenated monovalent hydrocarbon radicals for each Si atom, with an organosilicon compound containing alkoxy groups and/or siloxane oxygen groups and at least one SiC-bonded organofunctional radical per molecule in the presence of an organic solvent and a basic catalyst.The resultant organopolysiloxanes having SiC-bonded organofunctional groups may, for example, be used for preparing modified polymers by copolymerizing the organopolysiloxanes with a monomer containing an aliphatic double bond, such as styrene or hydroxyethyl methacrylate, or by reacting the organopolysiloxanes with an additional polymer such as an epoxy resin.

Abstract: A process is described by which numerous waste or by-product chlorosilane streams can be treated to obtain a granular gel that is easily handleable in further processing steps, shipment, or disposal operations. By hydrolyzing a combined stream with an average SiCl functionality greater than or equal to 2.8 in an aqueous medium at elevated temperature a granular gel is obtained in all cases. The combined stream can be formed by blending several different streams to obtain the desired average SiCl functionality. If the aqueous medium is concentrated hydrogen chloride, the hydrogen chloride generated in the hydrolysis step can be recovered.

Abstract: A laddery lower alkylpolysilsesquioxane represented by the formula: ##STR1## wherein R and R' represent same or different lower alkyl groups, and n represents an average degree of polymerization, said laddery lower alkylpolysilsesquioxane having a heat-resistant thin film-formability, characterized in that 15 to 30% by weight of the lower alkylpolysilsesquioxane is occupied by the portion having a standard polystyrene-reduced molecular weight of 20,000 or less as measured by gel permeation chromatography. Said silicone resin in which R and R' are methyl is prepared by dissolving CH.sub.3 SiCl.sub.3 in a ketone or an ether, adding water to this solution with stirring to hydrolyze CH.sub.3 SiCl.sub.3, condensing the hydrolyzate and, if necessary, subjecting the resulting condensate to a treatment for adjusting the proportion of the low molecular weight portion in the product.

Abstract: The invention relates to a novel thermoplastic monoorganopolysiloxane resin comprising units of the formula RSiO.sub.1.5 and R.sub.1 R.sub.2 R.sub.3 SiO.sub.0.5 wherein R,R.sub.1,R.sub.2 and R.sub.3 are hydrogen, or organic groups which may be the same or different, at least 85% of the R groups in the RSiO.sub.1.5 being organic groups, and at least two of the groups R.sub.1, R.sub.2 and R.sub.3 in each R.sub.1 R.sub.2 R.sub.3 SiO.sub.0.5 unit being organic groups, and in which the ratio RSiO.sub.1.5 units to R.sub.1 R.sub.2 R.sub.3 SiO.sub.0.5 units is from 1:0.005 to 1:0.03 on a molar basis. Such resins are useful as electrical insulation material and as hold out agents for heat recoverable materials.

Abstract: Acidic cyclic perfluoroaliphaticdisulfonimides, salts thereof, a process for making the same, curable compositions containing acidic cyclic perfluoroaliphaticdisulfonimides or salts thereof and cationically-sensitive monomers, and a process for using acidic cyclic perfluoroaliphaticdisulfonimides and salts thereof as catalysts for the cure of cationically-sensitive monomers.

Abstract: The invention relates to a novel process for the production of a thermoplastic, high softening point polysiloxane resin which comprises reacting a solvent-soluble partially condensed organosiloxane with a silane capping agent. The resins so produced are useful as electrical insulator material and also as hold out agents for heat recoverable articles.

Abstract: In a method for forming an abrasion-resistant coating film by heat-curing a coating composition composed mainly of a partially hydrolyzed product of alkoxysilane represented by the formula:R.sub.n.sup.4 Si(OR.sup.5).sub.4-nwherein n is an integer of 0 to 2; R.sup.4 is alkyl having 1 to 6 carbon atoms, phenyl, allyl, vinyl, methacryloxy, methacryloxyalkyl, mercaptoalkyl, aminoalkyl, epoxyalkyl, epoxyalkyloxy, epoxyalkyloxyalkyl, tetrahydrofuryl or fluoroalkyl; and R.sup.5 is alkyl having 1 to 4 carbon atoms, an improvement comprises using as a curing catalyst one or more compounds selected from the group consisting of alkali metal salts of thio-acid, dithio-acid and their derivatives; barbituric acid and its derivatives; and .beta.-dicarbonyl compound.

Abstract: Silicic acid heteropolycondensates made from hydrolyzable silicic acid derivatives and substituted silanes, optionally with either or both of one or more functional silanes and non-volatile metal oxides or their precursors are made by a known technique, in which the reaction mixture is hydrolyzed and condensed by the action of water and a condensation catalyst, the latter being employed in an amount up to 3% by weight, based upon the weight of the reaction mixture. Improved heteropolycondensates usable as adsorbents and porous membranes can be made by using greater amounts of catalyst, ranging up to 75% by weight, based upon the weight of the reaction mixture. These improved products are very stable in use and are characterized by a pore structure which includes fine pores and coarse pores, whereby products in the form of membranes can have an asymmetrical structure, if desired.

Abstract: A method for stabilizing silanol hydrolysates of organosilanes in an acid medium is described. The method comprises adding a neutralizing agent containing a chelatable metal ion to the silanol hydrolysate in an acid medium to reduce the acidity of the medium; removing solids from the medium; and adding a chelating agent to form a chelate with metal in the medium. In a preferred embodiment, methyltrimethoxysilane is hydrolyzed with an excess of slightly acidic water; calcium carbonate neutralizing agent is added thereto to reduce the acidity of the medium; excess calcium carbonate and other solids in the medium are removed by filtration; and acetylacetone is added as a chelating agent to form a chelate or to interact with the calcium from the calcium carbonate neutralizing agent in the medium. The process of this invention stops haze formation in the products formed by the process of the invention and substantially extends the shelf life of silanol hydrolysates of organolsilanes.

Abstract: A method is provided for making polyimides resulting from aromatic organic dianhydride and organic diamine interaction in the presence of an alkali metal salt of an oxygenated phosphorus compound.