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: A method for making a novel copolymer, which comprises: reacting(A) a compound represented by the formula: ##STR1## wherein Q represents >C.dbd.O or the following formula: ##STR2## wherein each X may be either the same or different and each represents hydrogen atom or hydroxyl group, of which at least one is hydroxyl group, and R.sup.1 represents an alkyl group having 1 to 18 carbon atoms, with(B) an epoxy group-containing trialkoxysilane and/or an epoxy group-containing dialkoxysilane in the presence of(C) an aluminum chelate compound represented by the formula:Al(OR.sup.2).sub.n L.sub.3-nwherein R.sup.2 represents an alkyl group having 1 to 4 carbon atoms, L represents the following formula: ##STR3## where R.sup.3 represents an alkyl group having 1 or 2 carbon atoms, R.sup.4 represents an alkyl group or an alkoxy group each having 1 or 2 carbon atoms,and n is an integer of 0, 1 or 2.

Abstract: A composition for coating, which comprises:(1) 100 parts by weight of film forming components comprising:(A) 10 to 90% by weight of an organosilane triol of the following formula and/or its partial condensate:R.sup.1 Si(OH).sub.3wherein R.sup.1 represents a monovalent group selected from the group consisting of alkyl groups having 1 to 3 carbon atoms and aryl groups, and(B) 90 to 10% by weight of colloidal silica; and(2) 5 to 40 parts by weight of a copolymer of:(C) a compound represented by the formula: ##STR1## wherein Q represents >C.dbd.O or the following formula: ##STR2## wherein each X may be either the same or different and each represents hydrogen atom or hydroxyl group, of which at least one is hydroxyl group, and R.sup.2 represents an alkyl group having 1 to 18 carbon atoms, and(D) an epoxy group-containing trialkoxysilane.

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

Abstract: The present invention relates to a shelf stable one component alkoxy-functional RTV composition. In particular, there is utilized a novel end-capping catalyst alone or with a co-catalyst to form a poly-alkoxy terminated diorganopolysiloxane polymer. Such a polymer is formed by reacting a silanol terminal diorganopolysiloxane, either with a polyalkoxy containing silazane cross-linking agent or an integrated cross-linker, scavenger in the presence of the end-capping catalyst.

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: One packages, room temperature vulcanizable organopolysiloxane compositions are provided having aluminum complex as a condensation catalyst. The room temperature vulcanizable organopolysiloxane compositions exhibit improved stability over an extended shelf period and have short tack-free times.

Abstract: The invention disclosed in this application is the use of novel silanes in curable coatings to allow tinting or dyeing of the coatings after they are cured on certain substrates.An example of one such useful silane is ##STR1## The silanes and the curable coatings are also useful as antistat and antifog coatings.

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 is provided for preparing coating compositions suitable for a primerless application to plastic substrates, which includes catalyzed prehydrolysis of a silylated UV screen component. Preferred embodiments employ catalyzing agents which can be removed from the prehydrolysis solution. Coating compositions made by the process are also disclosed.

Abstract: Polysiloxanes of relatively low molecular weight are catalytically polymerized/rearranged into high molecular weight polysiloxanes in the presence of a cationic catalyst comprising a porous, inorganic mineral particulate support having an average pore diameter in excess of 20 .ANG. and a pore volume ranging from 0.2 to 2 ml/g, said porous support being coated with less than 15 mg/m.sup.2 of a film of polymeric material comprising pendant sulfonic or phosphonic acid functions, and said polymeric material being characterized by an ion exchange capacity of less than 2 milliequivalents per gram.

Abstract: Agent for impregnating materials that contain cellulose, mainly paper and wood. The active ingredient is a mixture of alkali aluminate and alkyl silanols that exhibits an intense hydrophobing effect at low concentrations. The agent can be employed in aqueous solution, e.g. in an enclosed space without the special exhaust devices required with volatile solvents. The solution is storage-stable. It contains preferably between 0.1 and 2.0% by weight of alkyl silanol and between 0.03 and 0.1% by weight of alkali aluminate.

Abstract: The invention disclosed in this application is the use of novel silanes in curable coatings to allow tinting or dyeing of the coatings after they are cured on certain substrates.An example of one such useful silane is ##STR1## The silanes and the curable coatings are also useful as antistat and antifog coatings.

Abstract: An electrically insulated coil comprising a coil; and a mica tape wound around said coil and containing a resin composition; said resin composition including an epoxy resin, a curing catalyst consisting of an aluminum compound, and a curing accelerator selected from the group consisting of a silane compound having a hydroxyl group and a polysiloxane compound having a hydroxyl group, said curing catalyst being added in an amount of 0.1 to 5% by weight based on said epoxy resin, said curing accelerator being added in an amount of 0.1 to 10% by weight based on said epoxy resin, and said resin composition being cured by heating after said mica tape is wound around said coil.

Abstract: A method of preparing polycarbosilanes having high molecular weight and also having the major structural unit of silicon-carbon linkage. The method comprises heating a polysilane at 50.degree.-600.degree. C. in atmosphere of an inert gas and distilling out a low molecular weight polycarbosilane fraction having the number mean molecular weight of 300-600, followed by polymerizing the fraction by heating it at 250.degree.-500.degree. C. in atmosphere of an inert gas. The polycarbosilane obtained by the method of the present invention is useful for the precursor of preparing silicon carbide fibres and shaped articles.

Abstract: The invention provides a novel room temperature-curable organopolysiloxane composition useful as an adhesive or a sealing material with remarkably extended workable time owing to the delayed surface filming. The base component in the composition is a conventional diorganopolysiloxane terminated with hydroxy groups at both molecular chain ends admixed with several known ingredients such as a cross linking agent, curing catalyst, filler and the like. The most characteristic ingredient in the composition effective to achieve the above mentioned desired property is a 1,1,1-trimethyl-3-hydrocarbyl-3,3-di(acylamino)disiloxane which belongs to a novel class of organopolysiloxane compounds and method is described for the preparation of these siloxane compounds.

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: In a polysiloxane-based dental composition which crosslinks by an addition reaction and hardens at room temperature, the composition comprising(a) an organopolysiloxane with at least two vinyl groups in the molecule,(b) an organohydridopolysiloxane,(c) a catalyst to accelerate the addition reaction, and(d) a hydrophobic filler, the improvement which comprises including therein(e) an aluminosilicate containing finely divided palladium. This removes any by-product hydrogen and results in a smoother surface on any plaster of Paris moldings made from the hardened composition.

Abstract: Compositions suitable for sprayable, flexible coatings for food containers are made by mixing cycloaliphatic or bisphenol-A-epichlorohydrin epoxy resins, an alkoxylated monophenylsiloxane-dimethylsiloxane copolymer and aluminum chelates of beta-dicarbonyl compounds. Optionally, the coatings can contain phenyltrialkoxysilane.

Abstract: A composition useful as a catalyst in solution polymerization comprises (1) a barium, calcium and/or strontium alcoholate, (2) an organoaluminum compound and (3) an organomagnesium compound. (2) and (3) may be used as a complex with (1). The compositions can be used to polymerize ethylenically unsaturated monomers like butadiene, butadiene and styrene, and isoprene and heterocyclic monomers like oxiranes, thiiranes, siloxanes, thiatanes and lactams. The catalyst composition can produce polybutadienes and butadiene-styrene copolymers having a trans-1,4 content as high as 90%. The non-terminating features of the polymerization of this invention permit the preparation of functionally terminated butadiene based polymers and block polymers containing sufficient amounts of trans-1,4 butadiene units to crystallize.

Abstract: A process for preparing an epoxy-modified silicone resin which comprises reacting(A) an organosilicon compound containing substantially no hydroxyl groups directly bonded to the silicon atom and having the mean formulaR.sup.1.sub.a Si(OR.sup.2).sub.b O.sub.(4-a-b)/2in which each of R.sup.1 and R.sup.2 individually represents a substituted or unsubstituted monovalent hydrocarbon group, and a and b are in the ranges of 0.ltoreq.a<3, 0.001.ltoreq.b.ltoreq.4, and a+b.ltoreq.4, with(B) an epoxy compound containing at least one epoxy group and at least one hydroxyl group per molecule,in the presence of(C) a chelate compound selected from the group consisting of aluminum chelates and zirconium chelates.

Abstract: The invention provides a novel and improved room temperature curable organopolysiloxane composition which is very stable over a long period of time if stored under an anhydrous condition but readily curable on exposure to moisture-containing atmosphere without producing no condensation products having toxicity, unpleasant odor or corrosiveness. The composition comprises, as the main component, an organopolysiloxane having at least three alkenyloxy groups bonded to the silicon atom or atoms in the organopolysiloxane molecule through a silhydrocarbylene linkage, e.g. silethylene linkage, and a curing accelerator.

Abstract: An electrically insulated coil is composed of a coil and a mica tape containing a first resinous composition, wound upon the coil; the resinous composition containing a maleimide compound, an epoxy resin, a curing catalyst consisting of an aluminum compound, and a curing accelerator selected from the group consisting of a silane compound having a hydroxyl group and a polysiloxane compound having a hydroxyl group; the curing catalyst and the curing accelerator each being in an amount of about 0.0001 to 5% by weight based on the total amount of the maleimide compound and the epoxy resin; and the resinous composition being cured by heating after the mica tape is wound around the coil.The electrically insulated coil may further contain a second resinous composition comprising an epoxy resin and an acid anhydride, the second resinous composition impregnating the mica tape after the mica tape is wound around the coil, and being heat-cured together with the first resinous composition.

Abstract: Low temperature, fast curing compositions suitable for coatings, particularly for paper and other heat sensitive substrates, consist of certain epoxy resins, certain organopolysiloxanes containing silanol groups and contain organo aluminum catalysts. For example, glassine or Kraft paper are coated with a mixture of a cycloaliphatic epoxy resin having an epoxide equivalent weight of 140, a hydroxyl endblocked polydimethylsiloxane having a degree of polymerization of about 10 and aluminum tris(acetylacetonate) and cured in one minute at 135.degree. C.

Abstract: Hydrophilic, crosslinked organopolysiloxanes are obtained from the polymerization of hydroxyalkylmethacrylate and/or hydroxalkylacrylate in the presence of an organopolysiloxane containing at least 40 mol percent of monoorganosiloxane units.

Abstract: A process for preparing organopolysiloxane resins containing Si-bonded vinyl groups which comprises heating to a temperature of from about 85.degree. to 95.degree. C. a mixture containing (A) an organopolysiloxane having at least 0.1 percent by weight of Si-bonded hydroxyl groups and at least 50 mol percent of monoorganosiloxane units (RSiO.sub.3/2), (B) an organosiloxane containing from 2 to 10 silicon atoms per molecule, in which substantially all the silicon valences which are not satisfied by siloxane oxygen atoms, are satisfied by SiC-bonded hydrocarbon radicals, and having on the average at least two such hydrocarbon radicals for each silicon atom and at least one of the siloxanes (A) and/or (B) has an average of at least one SiC-bonded vinyl group, and (C) an acid activated bleaching clay; wherein the water released during the heating step by the condensation of Si-bonded hydroxyl groups is retained in the reactive mixture.

Abstract: A process for the production of silicic acid heteropolycondensates, wherein at least one hydrolysable silicic acid derivative; at least one substituted silane; optionally at least one functional silane and/or optionally at least one substantially involatile oxide soluble in the reaction medium or at least one compound forming a substantially involatile oxide are condensed in the presence of at least the quantity of water stoichiometrically required for hydrolysis and optionally in the presence of a condensation catalyst and/or a solvent. The polycondensates are useful in the production of membranes and adsorbents.

Abstract: Polyvinylimidazoline flocculants are converted to an easily handled granular form by pelletizing with siliceous material and a lower alcohol, or mixture of lower alcohols with esters or ketones, and subsequently drying the pellets.

Abstract: Organosilicon high molecular weight compounds containing silicon and carbon as the main skeleton components and organosilicon high molecular weight compounds containing silicon and carbon as the main skeleton components and 0.01-20% by weight of at least one foreign element other than silicon, carbon, hydrogen and oxygen have a number average molecular weight of 500-30,000, and intrinsic viscosity of 0.01-1.50 and a silicon carbide residual amount of not less than 40% by weight after baked at a temperature of 800.degree.-1,500.degree. C. in a non-oxidizing atmosphere and are useful for the production of silicon carbide moldings.

Abstract: Cationic polymerization of epoxy monomers, or prepolymers can be achieved by use of certain moisture sensitive dicarbonyl chelates of main row elements of Group IIIA-VA. Curable Compositions are provided which can be used as sealants, coating compounds, glues, incapsulants, etc.

Abstract: Self-bonding, low modulus, one-package room temperature vulcanizing silicone compositions, curable in the presence of moisture, comprise (a) a silanol chain-stopped polydiorganopolysiloxane; (b) a cross-linking silane; and (c) a silanol reactive organometallic ester compound of a metal, the compound having radicals attached to the metal atom, at least one of the radicals being a substituted or unsubstituted hydrocarbonoxy radical, attachment being through M--O--C linkages, where M is the metal, and any remaining valences of M are satisfied by other organo radicals attached to M through such linkages, or an --OH, --O-- or M--O--M linkage, the weight ratio of components (c) to (b) always being at least 0.5 to 1. Such compositions have unusually high adhesion to a variety of difficulty bondable substrates.

Abstract: Certain aluminum compounds, such as aluminum alkoxides, chelates and acylates, catalyst the reaction of .tbd.SiOH with ##STR1## to yield compositions containing ##STR2## linkages.