Abstract:
PROBLEM TO BE SOLVED: To provide a method for preparing a vinylsilane by which a high conversion rate accompanied with a high selectivity can be achieved with an ultrahigh space time yield. SOLUTION: A silane is added to a liquid phase containing an acetylenic hydrocarbon and a catalyst in the method for preparing the vinylsilane comprising reacting the acetylenic hydrocarbon with the silane having at least one silicon-bound hydrogen atom in the presence of a catalyst in the liquid phase. In particular, the reaction is carried out under a superatomic pressure and the spent acetylenic hydrocarbon is replenished during the reaction so as to maintain a pressure which is constant during the entire reaction. As a specific example, acetylene is reacted with trimethoxysilane in the presence of a tetramethyldivinyldisiloxaneplatinum solution in xylene as the catalyst in the xylene liquid phase to produce trimethoxyvinylsilane in high yield.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing an alkali metal alkoxide in a good yield, by using a catalyst of a low cost. SOLUTION: This method for producing the alkali metal alkoxide comprises reacting an alkali metal amalgam with an alcohol in the presence the catalyst containing porous iron. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a catalytic method for producing an alkali metal alkoxide (alkali metal alkanolate), a known reagent in the organic chemistry, and useful in the case of requiring a strong base as a reaction material and also as a catalyst in a specific reaction. SOLUTION: This catalytic method for producing the alkali metal alkoxide is to react an alkali metal amalgam with an alcohol in the presence of a catalyst containing iron having >=0.3 mass % carbon content.
Abstract:
PROBLEM TO BE SOLVED: To directly obtain the subject compound through the one-pot process by reaction between a specific halosilicon, a carboxylic acid salt or its anhydride and an alcohol without isolation of tetracyloxysilane, as side-reactions are suppressed. SOLUTION: A halosilicon of the formula: SiX4 (X is fluorine, chlorine, bromine, iodine) (for example, tetrachlorosilane) is allowed to react with compounds of the formula: MR R is formula I [Z is an unsubstituted, or a halogen- monosubstituted or polysubstituted 1-20C alkyl, a 2-20C alkenyl, a 2-20C alkynyl, a group of formula: -(CH2 )p A (p is 0-6; A is an unsubstituted or alkyl-substituted 3-20 membered hydrocarbon ring)]; M is a metal in I and II main groups in the periodic table} and a compound of the formula: HR [R is the formula O-Y (Y is the same as Z)] or an anhydride of formula II and a compound of the formula: HR to give the objective acyloxyalkoxysilane represented by the formula III (m, n are each 1-3; m+n is 4) through the one-pot process.
Abstract:
PROBLEM TO BE SOLVED: To control the flow resistance of a diaphragm in a desired range with good reliability by treating the diaphragm based on a fibrous material with a fluorine-contg. dispersion during or after the production of the diaphragm. SOLUTION: A diluent, sodium chloride, sodium hydroxide, sterilizer, surfactant, antifoaming agent, etc., are incorporated into a powdered and cleaned fiber to obtain a fibrous aq. slurry. A dispersion contg. a fluorine-contg. component and a soln. contg. the precursor of ZrO2 , as required, are added to the slurry while agitating to produce a recirculating diaphragm. Meanwhile, the diaphragm treatment is conducted during electrolysis, preferably during alkali chloride electrolysis. The amt. of the fluorine-contg. component to be used and incorporated in the dispersion is preferably controlled to 0.1 to 30 wt.% of the fibrous material in the diaphragm, and the fluorine-contg. component used in the diaphragm should be present at 30 to 500 g/m with respect to the area of the diaphragm.
Abstract:
PROBLEM TO BE SOLVED: To obtain an emulsion useful as a cosmetic preparation, especially a skin care composition, a hair care composition, a composition for caring a nail or a composition for sanitation in oral cavity by using a specific carboxamidopolysiloxane. SOLUTION: A compound represented by formula I [R, R' and R'' are each a 1-6C alkyl or phenyl; (a), (b), (n), (m) and (k) are each 0 or CHR -CH2 (R is a 1-20C alkyl, etc.)} or a compound represented by formula III (R''' is a 1-6C alkyl, a 1-6C alkoxy, etc.), preferably a compound having a carboxyl group content within the range of 0.02-2.0mequiv./g and 1×10 to 60×10 is used to obtain a cosmetic preparation. The resultant preparation is preferably used as an emulsion.
Abstract:
The preparation of compounds of formula CH2=CH-O-X-CH2CH2SiRy(OR')3-y (I) comprises reacting divinyl ethers of formula CH2=CH-O-X-CH=CH2 (II) with silanes of formula HSiRy(OR')3-y (III) at 70 - 150 deg C in the presence of a homogeneous hydrosilation catalyst. The catalyst is a platinum or rhodium compound, and the amount of Rh or Pt is 0.05 - 10 ppm with respect to (II and (III). R, R' = 1-6C alkyl or 6-10C aryl; X = 1-20C hydrocarbon, optionally substituted by halo and/or containing O atoms; and y = 0 - 2.
Abstract:
Alkoxy-formoxysilanes of formula (RO)xSi(OCOHO)y are new; in which R = 3-10 carbon (C) alkyl; x = 4-y; y = 1, 2 or 3. PREF. R = tertiary alkyl; x, y = 2.
Abstract:
Modification of the cross-flow resistance of a diaphragm based on fibrous material comprises treating the diaphragm, during or after manufacture, with a dispersion of a component (I) containing fluorine and optionally a solution containing a zirconium dioxide (ZrO2) precursor. Preferably treatment is carried out during electrolysis. The amount of (I) used is 0.1-30 wt.% w.r.t. the fibrous material of the diaphragm and the amount applied is 30-500 g/m diaphragm surface area.