摘要:
The method of making impermeable microcapsules comprises the steps of preparing an aqueous dispersion of microcapsules having a capsule wall of a water-insoluble polyamine-epoxy resin and adding to the aqueous dispersion an electrolyte to dehydrate the microcapsules.
摘要:
A new fluoran derivative useful as a colorless chromogenic material has the general formula: ##STR1## wherein R.sub.1, R.sub.2, X, Y and Z have the same meaning as defined hereinbefore.
摘要:
A process is described for preparing benzophenone derivatives of a high purity in an extremely high yield from 3-phenylphthalide derivatives with the use of at least one oxidizing agent.
摘要:
A hydrophobic organic solvent containing a compound of the formula ##STR1## is dispersed and emulsified in an aqueous medium containing a sulfinic acid of the formulaR.sub.5 --SO.sub.2 H (I)and serving as an aqueous medium for preparing microcapsules to react the compounds of the formulae (I) and (II) and synthesize a diarylmethane derivative of the formula ##STR2## while encapsulating oily droplets of the resulting hydrophobic organic solvent solution of the diarylmethane derivative. Colorless chromogenic materials can be synthesized and encapsulated at the same time by this process.
摘要:
The black color developing heat-sensitive recording material comprises a base sheet and a color developing layer formed on at least one surface of the base sheet, the color developing layer including colorless or light-colored chromogenic material and acceptor which is reactive with said chromogenic material to develop a black color. At least 60% by weight of the chromogenic material comprises at least two kinds of black color developing fluoran compounds having the eneral formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, X.sub.l and Ym are described hereinafter and the amount of each of said black color developing fluoran compounds is not larger than 90% by weight of the total amount of said black color developing fluoran compounds.
摘要:
A new fluoran derivative useful as a colorless chromogenic material has the following formula: ##STR1## wherein R, R.sub.1, R.sub.2, R.sub.3, X and Y have the same meaning as defined hereinbefore.
摘要:
A process is described for preparing triarylmethane derivatives of a high purity in an extremely high yield from 3-phenylphthalide derivatives and aniline derivatives or indole derivatives with Friedel-Crafts type catalyst or Friedel-Crafts type catalyst and an oxidizing agent.
摘要:
A process is described for preparing triarylmethane derivatives of a high purity in an extremely high yield from 3-phenylphthalide derivatives and aniline derivatives or indole derivatives with Friedel-Crafts type catalyst or Friedel-Crafts type catalyst and an oxidizing agent.
摘要:
Chromogenic compounds for use in pressure sensitive recording sheets represented by the formula: ##SPC1##Are disclosed, wherein R.sub.1 and R.sub.2 are independently, hydrogen substituted or unsubstituted lower alkyl, aliphatic acyl, phenyl substituted aliphatic acyl, benzoyl, aralky, phenyl (the benzene nuclei of those substituents may be further substituted by chlorine, bromine, lower alkyl, lower alkoxy or nitro), allyl, allyl substituted by lower alkyl or phenyl, propargyl, or propargyl substituted by lower alkyl or a phenyl; R.sub.3 and R.sub.4 are independently lower alkyl, benzyl and phenyl (the benzene nuclei or those substiutents may be further substituted by chlorine, bromine, lower alkyl or lower alkoxy), either R.sub.1 or R.sub.2 being other than hydrogen when R.sub.3 and R.sub.4 are both ethyl groups.
摘要:
A method for producing a sintered ferrite magnet having an M-type ferrite structure and represented by: Ca1−x−yRxBayFe2n-zCoz, (by atomic ratio), where 0.3≦1−x−y≦0.65, 0.2≦x≦0.65, 0.001≦y≦0.2, 0.03≦z≦0.65, 4≦n≦7, and 1−x−y>y. The method includes mixing a Ca compound, an R element compound, a Ba compound, an iron compound and a Co compound as starting materials; calcining the starting materials to obtain calcined bodies; pulverizing the calcined bodies to obtain a calcined powder; providing recycled materials having an M-type ferrite structure and being represented by the above formula; pulverizing the recycled materials to obtain a recycled material powder; mixing the recycled material powder with the calcined powder to form a moldable material; molding the moldable material to obtain green bodies; and sintering the green bodies to obtain the sintered ferrite magnet.
摘要翻译:一种具有M型铁氧体结构的烧结铁氧体磁体的制造方法,其特征在于,以Ca1-x-yRxBayFe2n-zCoz(原子比)表示,其中0.3≤1-xy≤0.65,0.2≤x≤0.65,0.001 @ y@0.2,0.03 @ z @ 0.65,4 @ n @ 7和1-xy> y。 该方法包括混合Ca化合物,R元素化合物,Ba化合物,铁化合物和Co化合物作为起始材料; 煅烧原料以获得煅烧体; 粉碎煅烧体以获得煅烧粉末; 提供具有M型铁氧体结构并由上式表示的再循环材料; 粉碎回收材料以获得再生材料粉末; 将再生材料粉末与煅烧粉末混合以形成可模制材料; 模制可模制材料以获得生坯体; 并烧结生坯以获得烧结的铁氧体磁体。