摘要:
In the synthesis of organohalosilanes by the direct process of reacting an organic halogen with metallic silicon powder, a metallic copper catalyst in the form of a thermally active metallic copper powder having large strain energy is used.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
3-(3,4-Dimethoxyphenyl)propyltrichlorosilane, which in a new material, was disclosed together with some ways to synthesize it. A usefulness thereof was illustrated by synthesizing polysilazane using the above new material and applying the polysilazane to a steel plate as a protective coat.
摘要:
A novel organosilicon compound of the following formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3, respectively, represent a monovalent hydrocarbon group having from 1 to 8 carbon atoms, is described.
摘要:
Cycloalkyl silane compound such as cyclohexyl methyl dichlorosilane can be efficiently prepared by the photochemically induced hydrosilylation reaction. For example, an equimolar mixture of cyclohexene and methyl dichlorosilane with admixture of a catalytic amount of an alcoholic solution of, chloroplatinic acid, is irradiated at a temperature up to 70.degree. C. with ultraviolet light so that the hydrosilylation reaction takes place and proceeds almost to completeness without deactivation of the platinum catalyst to give the desired product in a yield of 90% or even higher.
摘要:
A process for forming a moisture resistant coating, which comprises:(i) a step of priming a coating composition on a substrate and drying it to form a prime coat,(ii) a step of coating thereon a radical-polymerizable and oxidation-polymerizable, room temperature solventless coating composition containing a scaly pigment and polymerizing it to form a cured intermediate coat, and(iii) a step of finish coating thereon an air-drying finish coating composition and drying it to form an finish coat. '
摘要:
In an apparatus for preserving different kinds of reagents to be selectively delivered for performing different test items in an automatic chemical analyzer, the reagents are contained in respective vessels which are placed on a turntable rotatably arranged in a compartment inside of which is kept at a low temperature, beside each reagent container is movably arranged a plug plate having an elastic plug secured thereto and a movable lever is arranged to engage with any one of the plug plate so as to remove the plug out of an opening of the reagent vessel only when a probe of a delivery device is moved through the opening.
摘要:
A liquid feeder comprises a liquid suction and delivery pump which withdraws a liquid such as a culture solution, buffer solution, enzyme solution or the like which is retained in a liquid storage container as refrigerated or at a reduced temperature and delivers it through a flexible tube for injection into a culture vessel located within an incubator. The tube is inserted into an inner pipe and is sealingly secured thereto. The inner pipe is detachably and hermetically mounted in an outer pipe which extends through and is secured to a wall forming an environment isolating layer of the incubator. An eccentric crankpin which is driven by a motor is connected through a link with another crankpin having a greater eccentricity, the latter crankpin being driven for rotation to cause a reciprocatory rotating motion of a driven shaft about its own axis through an angular extent of less than 180.degree.. The motion of the driven shaft is effective to selectively switch the discharge port of a pair of liquid supply tubes to a position over a single vessel. The motor also drives a cam which causes a vertical motion of a drive shaft which is also angularly driven by a cam groove, the drive shaft being effective to cause a three dimensional motion of the discharge port of a single liquid supply tube for injection into a pair of vessels.