Toshio Shinohara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: When oganohalosilanes are prepared by charging a reactor with a contact mass containing a metallic silicon powder and a copper catalyst, and introducing an organohalide-containing gas into the reactor to effect the direct reaction, a poly(organo)phosphino compound is added to the contact mass. The invention is successful in producing organohalosilanes at a significantly improved production rate without reducing the selectivity of useful silane.
Abstract: Organohalosilanes are prepared by the Rochow process of reacting metallic silicon particles with an organohalide in the presence of a copper catalyst. The metallic silicon particles, which are prepared by committing fragments of metallic silicon raw material, have a mean particle size of 10 &mgr;m to 10 mm and a surface oxygen quantity of at least 0.05 wt % and/or at least 0.001 g of oxygen/m2 of silicon surface area, which is given as the difference between the oxygen concentrations determined by in-metal oxygen analysis of the metallic silicon particles and the fragments, respectively. On analysis, the metallic silicon particles have been held for at least 3 hours in an air atmosphere at 25° C.
Abstract: Organohalosilanes are prepared by the Rochow process of reacting metallic silicon particles with an organohalide in the presence of a copper catalyst. The metallic silicon particles, which are prepared by comminuting fragments of metallic silicon raw material, have a mean particle size of 10 &mgr;m to 10 mm and a surface oxygen quantity of up to 0.3 wt % which is given as the difference between the oxygen concentrations determined by in-metal oxygen analysis of the metallic silicon particles and the fragments, respectively.
Abstract: When oganohalosilanes are prepared by charging a reactor with a contact mass containing a metallic silicon powder and a copper catalyst, and introducing an organohalide-containing gas into the reactor to effect the direct reaction, a metal complex of an organophosphino compound is added to the contact mass. The invention is successful in producing organohalosilanes at a significantly improved production rate without reducing the selectivity of useful silane.
Abstract: A contact mass for use in the synthesis of organohalosilanes is prepared by adding metallic copper particles to metallic silicon particles, and rubbing the particles against each other under high shear forces in a non-oxidizing atmosphere, thereby forming a metallic copper thin film on the surface of the metallic silicon particles in a spot pattern or entirely. The contact mass is capable of reducing the time required for activation and has an extended lifetime.
Abstract: Novel 1,1,2,2-tetramethylpropylperoxy esters are provided. They are useful as a polymerization initiator in polymerizing vinyl chloride, vinylidene chloride and vinyl acetate monomers, with the advantage of completing polymerization within a short time.
Abstract: Silicon-containing peroxyester compounds, for example, represented by the following formula: ##STR1## useful as a polymerization initiator, which compounds can produce vinyl chloride polymers having a high quality in a high yield and in a short reaction time.
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: Disclosed is a method of producing dimethylpolysiloxanes through hydrolysis of dimethyldichlorosilane wherein a water solution containing a water-soluble oxygen-containing organic compound is introduced into dimethyldichlorosilane. Therein, linear dimethylpolysiloxanes alone having both ends blocked with chlorine atoms can be selectively produced by properly controlling the water content in the hydrolysis system and further by rendering the hydrolysis system acidic, and cyclic dimethylpolysiloxanes alone can also be selectively produced by properly controlling the water content in the hydrolysis system and optionally rendering the hydrolysis system acidic.
Abstract: A process for preparing hexamethylcyclo-trisilazane by heating octamethylcyclotetra-silazane in the presence of a catalyst such as a Lewis acid or a sulfur compound of the following formula ##STR1## wherein M represents Ca, Mg, Al, Fe or NH.sub.4, R represents OH, a phenyl group or a substituted phenyl group, x is 0, 1 or 2 and y is 0, 1, 2 or 3 provided that x and y are not zero at the same time, and z is 0, 1, 2 or 3.
Abstract: A method of producing dicyclopentyldichlorosilane which comprises reacting cyclopentene and dichlorosilane with each other by using a platinum catalyst and/or a rhodium catalyst in the presence of 1,3-diethinyl-1,1,3,3-tetramethyldisiloxane.
Abstract: Hexamethylcyclotrisilazane is prepared by reacting dimethyldichlorosilane with ammonia at a temperature between -20.degree. C. and 20.degree. C. Preferably, ammonia is blown into dimethyldichlorosilane at the temperature, and the reaction mixture is washed with 20% or higher alkaline water within one hour from the end of reaction for removing ammonium chloride by dissolving it in the water. Then hexamethylcyclotrisilazane of high purity is prepared in high yields. The method can be scaled up for commercial manufacture.
Abstract: A silylating agent comprising an N-(trialkylsilyl)benzanilide having the following general formula: ##STR1## wherein R.sup.1 is a lower alkyl group. This agent is reacted with a secondary amine to produce an N,N-dialkylaminotrialkylsilane. This process is free of formation of amine hydrochlorides as by-products. Therefore, the problem associated with disposal of such amine hydrochlorides and the problem of limitations on the use of the silane compound product due to mixing of such amine hydrochlorides can be obviated effectively.
Abstract: An N-tert-butyldialkylsilylmaleimide represented by the following general formula: ##STR1## wherein R's represent C.sub.1 to C.sub.5 alkyl groups which may be the same or different and a method of producing the compound. Said N-tert-butyldialkylsilylmaleimide is useful as a silylating agent, which does not produce hydrogen chloride or the like as a by-product and therefore does not require to use a neutralizing agent additionally. Further this compound is useful as a compound which provides a maleimido group.
Abstract: Highly pure diethylaminotrimethylsilane can be manufactured in a high yield through the reaction between diethylamine and an N,O-bis(trimethylsilyl)acetamide represented by the following general formula: ##STR1## wherein X represents H or F.
Abstract: Thexyl (C.sub.1 -C.sub.4) alkyl dialkoxy silanes are proposed as a class of novel organosilicon compounds such as thexyl methyl dimethoxy silane and thexyl n-butyl dimethoxy silane. These silane compounds can be synthesized by several different routes. For example, thexyl methyl dimethoxy silane is prepared starting from methyl phenyl chlorosilane which is subjected to the hydrosilation reaction with 2,3-dimethyl-2-butene to introduce a thexyl group and the compound is converted by the reaction with hydrogen chloride into thexyl methyl dichlorosilane which is methoxylated by the reaction with methyl alcohol.
Abstract: Several thexyl trialkoxy silanes as a novel class of organosilicon compounds were synthesized by the reaction of dehydrochlorination condensation between thexyl trichlorosilane and an alcohol, e.g., methyl, ethyl, isopropyl and isobutyl alcohols, and characterized by the analytical data. These compounds are useful as an intermediate in the synthetic preparation of other organosilicon compounds, starting material of various silicones, surface-treatment agent of inorganic materials and additive in complex catalysts.
Abstract: There is provided a novel organosilicon compound, 1,3-bis(p-hydroxybenzyl)-1,1,3,3-tetramethyldisiloxane. It is prepared by silylating 1,3-bis(p-methoxybenzyl)-1,1,3,3-tetramethyldisiloxane with trimethylsilyl iodide, followed by desilylation.
Abstract: Cyclopentyl trichlorosilane can be efficiently prepared by the hydrosiliaton reaction of trichlorosilane and cyclopentene which can proceed only to a very low extent by the use of conventional platinum catalysts effective in other hydrosilation reactions. Thus, an equimolar mixture of the reactants is heated in the presence of a chlorine-deficient chloroplatinic acid catalyst of a specified chlorine:platinum atomic ratio at a temperature higher than the boiling point of the mixture under normal pressure in a pressurizable vessel so that the desired product can be obtained in a yield of 90% of the theoretical value or higher.