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| Number | Title | Issue Date |
| 6861541 | Method for preparation of an anthraquinone colorant composition Disclosed herein is a method for producing a 1-[4-(biphenyl-4-carbonyl)]phenylaminonthraquinone colorant composition where the method comprises: reacting 4-halobenzoic acid with about 1 mole to about 4 moles of a halogenating agent per mole of said 4-halobenzoic aci... | 03/01/2005 |
| 5493036 | Fibre-reactive anthraquinone dyes, their preparation and the use thereof The invention relates to fibre-reactive anthraquinone dyes of formula ##STR1## wherein R1, R2, B, U, R and n are as defined in claim 1. The anthraquinone dyes of formula (1) are suitable for dyeing or printing hydroxyl group con... | 02/20/1996 |
| 5387704 | Preparation of anthraquinones Process for preparing amino- and carbamoyl-substituted anthraquinones by Diels-Alder reaction of an N-butadienylcarbamic acid ester of the formula H2 C.dbd.CH--CH.dbd.CH--NH--COOR2, wherein R2 is alkyl or phenylalkyl, with... | 02/07/1995 |
| 5213665 | Process for producing 1-aminoanthraquinones A process for producing 1-aminoanthraquinones represented by formula (C) ##STR1## wherein R1 and R2, independently from each other, denote one type selected from a hydrogen atom, an alkyl group having 1 to 4 carbon atoms and a h... | 05/25/1993 |
| 5204370 | Bis-(hydroxyalkylamino)-anthraquinone inhibitors of protein kinase C The present invention provides novel substituted anthraquinones having the formula ##STR1## wherein R1 and R2 are independently H, C1 -C10 alkyl, aryl, arylalkyl, alkylaryl; n and m are independently 1, 2, ... | 04/20/1993 |
| 5182395 | Isopropyl 1-amino-4-m-toluidinoanthraquinone-2-carboxylate Disclosed are a novel compound represented by the formula ##STR1## and compositions for sublimation transfer records and for color toners containing the same.... | 01/26/1993 |
| 5149848 | Process for producing 1-aminoanthraquinones A process for producing 1-aminoanthraquinones represented by the formula (C) ##STR1## wherein R1 and R2, independently from each other, denote one type selected from a hydrogen atom, an alkyl group having 1 to 4 carbon atom... | 09/22/1992 |
| 5141957 | 1,4-bis-(amino-hydroxyalkylamino)-anthraquinones for inhibiting protein kinase C The present invention provides novel substituted anthraquinones having the formula ##STR1## wherein R1 and R2 are independently H, alkyl, aryl, or arylalkyl; m and n are independently 1, 2, or 3; X is H, OH, NR3 R | 08/25/1992 |
| 5132437 | Synthesis of 1-aminoanthraquinone 1-Aminoanthraquinone (1-AAQ) is synthesized by the reaction of 2-chlorobenzyl chloride and xylene in the presence of a solid acid catalyst to yield 2-chloro dimethyldiphenylmethane, subsequent oxidation of the methyl groups, ring closure to form a 1-chlor... | 07/21/1992 |
| 5130448 | Synthesis of 1-aminoanthraquinone 1-Aminoanthraquinone (1-AAQ) is synthesized by the condensation of 2-substituted benzoic acid and xylene to yield 2-substituted-dimethylbenzophenone, subsequent oxidation of the methyl groups, ring closure to form a 1-substituted anthraquinone carboxylic ... | 07/14/1992 |
| 5066820 | Process for the preparation of 1-amino-2-carboxyanthraquinones The preparation of 1-amino-2-carboxyanthraquinones I ##STR1## (X denotes hydrogen, chlorine or bromine) by oxidation, under alkaline conditions, of a 1-aminoanthraquinone substituted in the 2-position by an oxidizable carbo-organic radical followed b... | 11/19/1991 |
| 5017713 | Process for preparing substituted aminoanthraquinones Substituted aminoanthraquinone compounds, which are used for dye stuffs or intermediate thereof, represented by the formula (II) ##STR1## wherein R3 represents a C1 -C6 alkyl group which may be substituted, X represen... | 05/21/1991 |
| 4950756 | Preparation of 1-nitroanthraquinone-2-carboxylic acid 1-Nitroanthraquinone-2-carboxylic acid of the formula I ##STR1## is prepared by treating novel 2-substituted 1-nitroanthraquinones of the general formula II ##STR2## where R is --CH.dbd.CH--R1 or --CH2 --CHO, where R1 | 08/21/1990 |
| 4940692 | Transfer of dyes Heat transferable dyes which compared with the prior art show better solubility and/or higher light fastness and good to excellent transfer properties have the formula (I) ##STR1## where X is H or CN, R1, R2, and R3 i... | 07/10/1990 |
| 4883611 | Dichroic coloring agents for liquid crystal displays Dichroic coloring agents which have a blue to blue-violet hue and have not been used to date for liquid crystal displays are disclosed. These coloring agents are represented by the following formula: ##STR1## wherein X is S or NH; R1 is a ... | 11/28/1989 |
| 4770818 | Process for the preparation of 1-aminoanthraquinones There is disclosed a process for the preparation of 1-aminoanthraquinones from 5-nitro-1,4,4a,9a-tetrahydroanthraquinones with a basic reducing agent, which process is carried out under pressure in the temperature range above 100° C. and in an aqueous-or... | 09/13/1988 |
| 4610804 | Anthraquinone dyes and liquid crystal compositions including the same A liquid crystal composition comprising a host liquid crystal material and at least one guest novel anthraquine dye dissolved in said host liquid crystal material has a high order parameter, sufficient solubility in the host liquid crystal and high stabil... | 09/09/1986 |
| 4549989 | Process for the preparation of monoaminoanthraquinones The invention relates to a process for the preparation of monoaminoanthraquinones of the formula ##STR1## wherein R is a non-ionic substituent and n is 0, 1, 2 or 3, by reduction of corresponding mononitroanthraquinones, which process comprises react... | 10/29/1985 |
| 4528113 | Anthraquinone dye and liquid crystal composition containing the dye An anthraquinone dye and a liquid crystal composition containing the dye are disclosed. The liquid crystal composition is preferably used in an electro-optic cell which enables a good color display utilizing the guest-host effect of the liquid crystal.... | 07/09/1985 |
| 4518535 | Preparation of electrically conductive systems from substituted phenalenes, and the products obtained Air-stable, electrically conductive systems having conductivities greater than 1×10-3 Ω-1 cm-1 are prepared by reacting a metal cation of an element of sub-group VII, VIII or I of the periodic table with a 1,9-substitute... | 05/21/1985 |
| 4507221 | Anthraquinone dye and liquid crystal composition containing the same An anthraquinone dye and a liquid crystal composition containing the same are disclosed. The anthraquinone dye shows a cyan color and has excellent order parameter, solubility and stability. The liquid crystal composition is particularly used in an electr... | 03/26/1985 |
| 4491532 | Liquid-crystal mixture with a pleochroic anthraquinone dye, and method for producing such a dye Liquid-crystal mixture with a pleochroic anthraquinone dye of the general formula ##STR1## with R1, R3, R4, R6 =H, OH, OCH3, NH2, NHCH3, NO2, characterized by the... | 01/01/1985 |
| 4464282 | Organic materials A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one anthraquinone compound free from water solubilizing and ionic substituents ... | 08/07/1984 |
| 4457855 | Stable hypochlorite solution suspendable dyes This invention relates to dyes which are resistant to hypochlorite attack, exemplary of which are anthraquinone dyes of the general formula: ##STR1## wherein X1, X2, X3, X4, R5, R6, R7... | 07/03/1984 |
| 4456545 | Dichroitic anthraquinone dyestuffs useful in liquid crystalline dielectrics and electro-optical indicator elements New dichroitic dyestuffs useful as components of liquid crystalline dielectrics for electro-optical indicator elements based on the guest-host effect have the formula ##STR1## wherein W, X, Y and Z each is hydrogen, NH2, OH, NHCH3 | 06/26/1984 |
| 4405211 | Liquid crystal compositions with pleochroic anthraquinone dyes A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a formula: ##STR1## wherein: R represents a group sele... | 09/20/1983 |
| 4402854 | Liquid crystals having pleochroic dyes Anthraquinone dyes of the general formula: ##STR1## wherein R1, R3, R4 and R6 are selected from the group consisting of H, OH, OCH3, NO2, NH2 and NHCH3 ; R2 | 09/06/1983 |
| 4391754 | Anthraquinone compounds Compounds of the formula: ##STR1## wherein R1 is alkyl or aryl; X is H, NH2 or NHCH3 ; one of Y and Z is OH and the other is H, NH2 or NHCH3 ; and one of R2 and R3 is H and the one th... | 07/05/1983 |
| 4376715 | Composition based on liquid crystal for electro-optical device A composition for use in an electro-optical device, particularly a display device, contains anthraquinone pleochroic dye of formula (I): ##STR1## where R1 is a substituted or unsubstituted amino group or a hydroxy group; each of R2 | 03/15/1983 |
| 4363743 | Liquid crystals having pleochroic dyes Anthraquinone dyes of the general formula: ##STR1## wherein R1, R3, R4 and R6 are selected from the group consisting of H, OH, OCH3, NO2, NH2 and NHCH3 ; R2 | 12/14/1982 |
| 4328161 | Process for the preparation of 1-aminoanthraquinones A selective process for the preparation of 1-aminoanthraquinones from the corresponding 1-aminoanthraquinone-2-carboxylic acid by decarboxylation in an acid solution in the presence of iron or zinc as a catalyst.... | 05/04/1982 |
| 4309221 | Anthraquinone derivatives Anthraquinone derivatives of the formula ##STR1## or of the tautomeric formula ##STR2## in which A denotes an anthraquinone radical which is free from sulphonic acid groups and is optionally further substituted and which preferably consists... | 01/05/1982 |
| 4296044 | Process for the preparation of cationic anthraquinone dyestuffs Cationic anthraquinone dyestuffs of the formula ##STR1## wherein R1 denotes hydrogen, alkyl or cycloalkyl, R2 denotes hydrogen, alkyl or bromine, R3 denotes alkylene, R4 and R5 denote alkyl, aryl or aralky... | 10/20/1981 |
| 4285874 | 1-Isocyanato-anthraquinones 1-Isocyanato-anthraquinones, which are valuable dyestuff intermediate products, are obtained in good yields when 1-amino-anthraquinones are introduced into phosgene or a solution of phosgene at -10° to 50° C., the reaction mixture is heated to 100° to ... | 08/25/1981 |
| 4244968 | Treatment of arthritis and substances for use in such treatment 1,8-Dihydroxy and 1,8-diacetoxy anthraquinones and derivatives thereof are used to treat the symptoms of arthritis.... | 01/13/1981 |
| 4226783 | -Chlorination process A process for -chlorination of side chains of electronegatively substituted aromatic compounds with dichlorine monoxide.... | 10/07/1980 |
| 4187238 | Anthraquinone disperse dyes Disperse dyes of the formula (I) ##STR1## wherein R represents substituted or unsubstituted alkyl, cycloalkyl or hydrogen, R' represents substituted or unsubstituted alkyl, cycloalkyl, aralkyl or phenyl, and R" represents a radical of the formulae --... | 02/05/1980 |
| 4124355 | Transfer dyeing with 1-amino-4-anilinoanthraquinone dyes A process for the transfer color printing of synthetic textile materials wherein the dyestuff used is a 1-amino-4-anilinoanthraquinone having one or two ortho substituents in the anilino group. The anthraquinone nucleus may be further substituted in the 2... | 11/07/1978 |
| 4115056 | Methods for dyeing or printing using amino-anthraquinone reactive disperse dyes The present invention provides useful new fibre-reactive disperse dyes of the formula (1) ##STR1## wherein R1 represents hydrogen or alkyl, R2 represents hydrogen, alkyl, cycloalkyl, aralkyl or substituted or unsubstituted pheny... | 09/19/1978 |
| 4110355 | Anthraquinone compounds useful in photographic processes This invention relates to a novel class of compounds which are capable of reacting in such a way as to form a new heterocyclic ring, and as a function of such reaction and ring formation to split off a color-providing material.... | 08/29/1978 |
