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    • 113. 发明专利
    • Improvements in and relating to the production of dyestuffs and intermediates of thebenzanthrone series
    • GB384999A
    • 1932-12-16
    • GB1746731
    • 1931-06-16
    • DAVID CLARENCE RHYS JONESROBERT FRASER THOMSONICI LTD
    • C09B3/02
    • Benzanthrone derivatives; dibenzpyrenequinones.--The mixture of alkali soluble products obtainable by condensing o-halogenated benzoic acids or their salts with benzanthrones (for example, according to the process of Specification 358,426) is (i) extracted with an inert organic solvent such as acetic acid, benzene or other liquid in which benzanthrone is readily soluble, (ii) the undissolved portion separated by filtration, (iii) the resulting filtrate diluted with an inert liquid in which benzanthrone is substantially insoluble but which is miscible with the above inert organic solvent, (iv) the precipitated solid separated, and if desired (v) residual dissolved matter recovered. The fractions so separated may be halogenated and also treated with acid condensing agents before or after such halogenation. In examples, (i) the alkali-fusion product of sodium o-chlorbenzoate and benzanthrone is extracted with glacial acetic acid at the boil and on cooling a violet residue separates out which is a blue vat-dye; the filtrates are diluted with water and a light-green precipitate filtered off; this appears to be a benzanthronylbenzoic acid; evaporation of the aqueous filtrates yields a yellow substance; the glacial acetic acid may be replaced by benzene in which case instead of water, petroleum ether or petrol is employed; (2) the light-green precipitate of (1) is brominated in glacial acetic acid; the brominated product is treated with concentrated sulphuric acid to give a dibenzpyrenequinone (dyes yellow to orange); (3) the light-green precipitate of (1) is treated with phosphorus pentoxide in nitrobenzene to give a dibenzpyrenequinone; alternatively boric acid with sulphuric acid may be used as condensing agent; (4) the light-green precipitate of (1) is chlorinated in glacial acetic acid; (5) the yellow residue of (1) is chlorinated in glacial acetic acid; (6) the violet residue of (1) is chlorinated in acetic acid.
    • 115. 发明专利
    • Process for the manufacture and production of vat dyestuffs containing sulphur
    • GB328705A
    • 1930-05-08
    • GB484129
    • 1929-02-13
    • IG FARBENINDUSTRIE AG
    • C09B3/02
    • 328,705. Johnson, J., Y., (I. G. Farbenindustrie Akt.-Ges.). Feb. 13, 1929. Anthraquinone vat dyes are obtained by the action of alkaline condensing agents on anthraquinonylmercaptobenzanthrones or anthraquinonylmercaptodibenzanthronyls other than those of such compounds in which an anthraquinone residue is attached by means of a mercapto group to the Bz1- and/or 2-positions in a benzanthrone radical. In examples, the following substances are fused with alcoholic potash :-1 -anthraquinonyl-6-mercaptobenzanthrone, 1 -anthraquinonyl- 8-mercaptobenzanthrone, di-a-anthraquinonyl- 6 : 6 -dimercapto-2 : 2'-dibenzanthronyl (prepared by condensing 1 mol. of 6: 6 -dichloro-2 : 2 -dibenzanthronyl with 2 mols. of sodium anthraquinone-1-mercaptide), di-a-anthraquinonyl-6: :6 - dimercapto-Bz1 : Bz1 -dibenzanthronyl and di-aanthraquinonyl - dimercapto - 2 : Bz1 - dibenzanthronyl (prepared by treating 2 : Bz1-dibenzan thronyl with bromine and condensing 1 mol. of the dibromo derivative with 2 mols. of sodium anthraquinone-1-mercaptide). The products dye cotton in greenish-blue to marine-blue shades.