摘要:
Silicon carbide of improved quality is obtained by using a liquid silicic acid or modified liquid silicic acid as a silicic substance and carbon in a powdered form, a precursor of carbon in a powdered form, or a precursor of carbon in the form of a solution as a carbonaceous substance, and thermally treating these raw materials in a non-oxidative atmosphere. The silicon carbide thus produced is finely divided and in high-purity and suitable for use as raw material for the production of high-strength sintered articles.
摘要:
Silicon nitride of improved quality is obtained by using a liquid silicic acid or modified liquid silicic acid as a silicic substance and carbon in a powdered form, a precursor of carbon in a powdered form, or a precursor of carbon in the form of a solution as a carbonaceous substance, and thermally treating these raw materials in a non-oxidative atmosphere containing nitrogen. By this method, .alpha.-type silicon nitride can be easily obtained. Particularly, finely divided .alpha.-type silicon nitride suitable for use as the raw material for the production of high-strength sintered articles is also produced. .alpha.-type silicon nitride whiskers useful as a reinforcing material for ceramic and metallic articles is also obtained.
摘要:
Rare-earth metal salts of organic carboxylic acids of this invention constitute themselves phosphors which exhibit unusually high luminescence efficiency, excel in chemical and physical stability and weatherability, show high affinity for other chemical substances and promise extensive usefulness in the field of high-performance luminescent products.
摘要:
A condensation polymer having a .eta.sp/C=0.1-1.5, containing an anthracene unit in the main chain of the polymer, which is found to have various functions of ultraviolet absorption, fluorescence emission, photoconductivity, organic semiconductor characteristics, etc. as well as excellent flexibility and mechanical strength, is prepared by condensation of an anthracenediol compound with a dicarboxylic acid dihalide or a hydrocarbylene dihalide.
摘要翻译:具有eta sp / C = 0.1-1.5的聚合物,其在聚合物主链中含有蒽单元,发现其具有紫外线吸收,荧光发射,光电导性,有机半导体特性等的各种功能 作为优异的柔软性和机械强度,通过蒽二醇化合物与二羧酸二卤化物或亚烃基二卤化物的缩合制备。
摘要:
Rare-earth metal salts of organic carboxylic acids of this invention constitute themselves phosphors which exhibit unusually high luminescence efficiency, excel in chemical and physical stability and weatherability, show high affinity for other chemical substances and promise extensive usefulness in the field of high-performance luminescent products.
摘要:
Manufacture of orthomethylated phenol compounds by the reaction of phenol compounds having a hydrogen atom at the ortho position and methanol is accomplished advantageously by a method which effects the reaction by use of a catalyst comprising (A) iron oxide, (B) indium oxide, and (C) at least one member selected from the group consisting of chromium oxide and silicon oxide. According to this method, the reaction permits the orthomethylated phenol compound to be produced in high yields for a long time because of the catalyst's excellent activity-retaining property. Since the ortho-position selectivity and the utilization ratio of methanol are high and, consequently, the utilization efficiency of raw materials is high, the method of this invention produces the orthomethylated phenol compound with high efficiency from the phenol compounds.
摘要:
An electrophotographic sensitive article comprising an electroconductive substrate and a photoconductive layer formed on said substrate and composed of an electric charge generating substance and an electric charge transfer substance, which sensitive article is characterized by said electric charge transfer substance having as an active component thereof a polyester obtained from a diol component consisting preponderantly of 2,6-dimethoxy-9,10-anthracene diol and a dicarboxylic acid component consisting preponderantly of .alpha.,.omega.-dicarboxylic acid. This electrophotographic sensitive article has remarkable sensitiveness and processability.
摘要:
A persistent photoconductive element comprising an electroconductive support, a pigment layer formed on said support and composed mainly of a phthalocyanine pigment or Indanthrene Blue GCD and a polymer layer formed on said pigment layer and composed mainly of a polyvinyl carbazole, said polymer layer containing at least one member selected from the group consisting of aliphatic halogenated hydrocarbons, halogenated acyl compounds, halogenated keto compounds and hydrogen donor compounds. This element exhibits an improved photoconductive sensitivity and prolonged photoconductivity over the prior art, whereby it is highly useful in electrophotographic processes requiring persistent photoconductivity. Additives, such as plasticizer and binding agent, may be incorporated in the polymer and pigment layers to improve the flexibility and mechanical durability of the persistent photoconductive element.
摘要:
One or more ketoses such as fructose are separated from a solution of sugar mixture containing the ketoses and one or more aldoses by contacting the solution of sugar mixture with an insoluble high polymer having primary amine moieties to remove the aldoses from the liquid phase by bonding the aldoses to the high polymer.
摘要:
A water repellent inorganic foam is prepared by foaming and setting a foamable composition comprising an aqueous metal phosphate in the presence of a specific compound having hydrophobic groups and functional groups reactive with said metal phosphate.