摘要:
There are provided new pigments of the "bismethinic" type having the formula ##STR1## where A is benzene, 2,5-dimethoxy-benzene, 2,5-dichlorobenzene, naphthalene, diphenyl or anthracene, and B is azobenzene, azotoluene, 2-methoxy-5-benzanilide, 2-methoxy-3',4'-chloroazobenzene, 2-hydroxy-5-methyl-benzene, 2-methoxy-5-benzoylamino-benzene, 2-methoxy-5-ureido-benzene, 2-chloro-5-carboxybenzene, 2,4-dichloro-benzene, 2,5-dimethoxy-4-chloro-benzene, benzothiazole, 1-(3-chlorophenyl)-pyrazole, 1-(3,4-dichlorophenyl)-pyrazole, indazole, 2,4-dimethoxy-benzene, 4-dimethylamino-benzene, benzimidazolone, 2-methoxy-5-acetylamino-benzene or 2-methoxy-benzene.
摘要:
The present invention concerns a new class of pigments derived from cumarin and, more particularly, of bis-iminocumarinic and bis-cumarinic pigments having the following formula I described hereinlater. The present invention also includes novel processes for making the cumarinic pigments of the invention. Also, the invention relates to the use of the novel pigments of the invention for the preparation of paints, storing enamels, inks and pastes for the printing of fabrics. Also, included in this invention is the dyeing of plastic materials with the novel cumarinic pigments.
摘要:
Esters of arylacetic acids, more particularly lower alcohol esters of arylacetic acids, including those substituted on the methylene group, are prepared by rearrangement of the corresponding alpha-halo-alkylarylketones with Ag compounds in lower alcohols and in an acid medium. From the alkyl esters so prepared, their respective free acids can be obtained, if desired, by various means such as hydrolysis or the shift with mineral acids of the alkaline salts prepared by reaction with alkali, etc.
摘要:
Catalysts for oxychlorination of ethylene to 1,2-dichlorethane, comprising compounds of copper and magnesium supported on gamma alumina, wherein the copper, expressed as metal, is present in a quantity from 7 to 12% by weight and the Mg/Cu ratio is from 0.05 to 1, wherein the distribution of copper in the catalyst particle is such that the ratio X/Y between the concentration of the copper atoms on the surface given by the Al/Cu ratio (X) on the surface (20-30 nm layer) and the concentration given by the Al/Cu ratio (Y) referred to the entire particle is greater than 1.3 and can reach 3.
摘要:
A catalyst for the oxi-chlorination of ethylene to 1,2-dichloroethane which comprises cupric oxychloride (CuOHCl) as an active component. CuOHCl is preferably supported on a porous support such as alumina and used in fixed-bed oxi-chlorination processes.
摘要:
Liquid-crystalline, thermotropic, aromatic polyesters processable in the molten state, comprising units derived from hydroquinones substituted with aryl, aralkyl and aroyl groups, and from phenoxy-hydroquinone.
摘要:
Catalysts for oxychlorination of ethylene to 1,2-dichlorethane, comprising compounds of copper and magnesium supported on gamma alumina, wherein the copper, expressed as metal, is present in a quantity from 7 to 12% by weight and the Mg/Cu ratio is from 0.05 to 1, wherein the distribution of copper in the catalyst particle is such that the ratio X/Y between the concentration of the copper atoms on the surface given by the Al/Cu ratio (X) on the surface (20-30 nm layer) and the concentration given by the Al/Cu ratio (Y) referred to the entire particle is greater than 1.3 and can reach 3.
摘要:
Cross-linkable thermotropic liquid crystalline aromatic polyesters comprising at least one unit derived from an aromatic diol substituted with at least one allyl group, in combination with units derived from dioxyaryl and dicarboxyaryl monomers.
摘要:
A catalyst is described for hydrogenation of unsaturated hydrocarbons, containing catalytically active amounts of Pd and optionally Ag in a support. The catalyst is characterized by the fact that the support represents a shaped body with a trilobal cross section, the lobes being provided with continuous openings. The catalysts can be produced according to a method, in which the support is impregnated with a solution of salts of Pd and optionally Ag. These salts are reduced by means of a reducing agent, whereupon the support so impregnated is washed, dried and calcined and, if reduction is not complete, the still present oxides of Pd and Ag are reduced to the corresponding metals in a hydrogen-containing atmosphere.
摘要:
An aromatic polyesteramide possessing thermotropic liquid crystalline polymer characteristics, which are easily workable in the molten state and have the mesogenic group in the main chain, are obtained by condensing possible substituted aminophenols and hydroquinone derivatives with aromatic dicarboxylic acids.