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| Number | Title | Issue Date |
| 6884899 | Preparation of 1-amino-4-hydroxyanthraquinones The present invention relates to a process for preparing 1-amino-4-hydroxyanthraquinones of the formula (I) wherein R is an aliphatic or aromatic radical, by reacting 1,4-dihydroxyant... | 04/26/2005 |
| 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 |
| 5480873 | Pharmaceutical compounds Pharmaceutical compounds of the formula ##STR1## in which R1 and R2 are each hydrogen, hydroxyl, halo, C1-4 alkyl, C1-4 alkoxy, acyloxy, --O-glucoside, optionally substituted phenyl or optionally substitute... | 01/02/1996 |
| 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 |
| 4985545 | Water-soluble formazan colorant containing reactive group and method of dyeing by its use A water-soluble formazan colorant, which is represented by the following general formula (I) in the form of free acid: ##STR1## (where: R represents a hydrogen atom or a lower alkyl group which may be substituted; X denotes a phenylene group or a nap... | 01/15/1991 |
| 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 |
| 4536320 | Nematic liquid crystalline composition A composition for a liquid crystal display containing at least one nematic liquid crystalline material having dissolved therein at least one anthraquinonic dye of the formula ##STR1## wherein R is a linear or branched C7-15 alkyl group.... | 08/20/1985 |
| 4506957 | Liquid crystal materials containing 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 characterized in that the dye comprises at least one anthraquinone compound free from water-solubilizing and ionic substituen... | 03/26/1985 |
| 4493785 | Anthraquinone compounds New pleochroic anthraquinones, suitable for use in colored liquid crystal displays based upon the guest-host effect, of the formula: ##STR1## wherein R & R1, each independently, represents C4-7 -n-alkyl; and R2 & R | 01/15/1985 |
| 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 |
| 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 |
| 4391489 | Liquid crystal materials containing 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 one of X and Y is OH and t... | 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 |
| 4356102 | Dichroic liquid crystal compositions containing anthraquinone-based dyes Liquid crystal compositions having guest anthraquinone-based dyes dissolved therein, are disclosed. The anthraquinone-based dyes have the general formula: ##STR1## wherein at least one of X and X' is a 5-membered ring connected to the lateral po... | 10/26/1982 |
| 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 |
| 4310666 | Anti-neoplastic 1,4-bis-(substituted aminoalkyl amino)-anthraquinones An antineoplastic 1,4-bis-substituted-9-10-anthracenedione having the formula ##STR1## wherein W, X, Y and Z are each independently selected from the group consisting of hydrogen, OH, NH2, OCH3, N(CH3)2, F,... | 01/12/1982 |
| 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 |
| 4304683 | Composition for liquid crystal color display element A composition for nematic liquid crystal color display elements, said composition comprising at least one anthraquinonic dye represented by the formula ##STR1## wherein X and X' are the same and represent --NH2 or --OH, and R represen... | 12/08/1981 |
| 4250102 | Process for the manufacture of aminohydroxyanthraquinones The invention relates to a process for the manufacture of an aminohydroxyanthraquinone of the formula ##STR1## wherein both of X are hydrogen or one X is --NH2 and the other is --OH and Z is hydrogen, C1 -C4 alkyl or ... | 02/10/1981 |
| 4247457 | Cationic dyes containing an aryloxy group linked through a bridging radical to a quaternized nitrogen atom Basic dyes, e.g., azo dyes and anthraquinone dyes, free from sulphonic acid groups which contain, a group of the formula ##STR1## in which R and R1, independently, are substituted or unsubstituted C1-4 alkyl or are linked to for... | 01/27/1981 |
| 4243600 | Process for the manufacture of 1,4-diaminoanthraquinone-2-carboxylic acid A process for the manufacture of 1,4-diaminoanthraquinone-2-carboxylic acid, which comprises reacting 1-nitroanthraquinone-2-carboxylic acid or derivatives thereof with hydroxylamine or derivatives thereof, in alcohol/water mixtures at basic value pH valu... | 01/06/1981 |
| 4226783 | -Chlorination process A process for -chlorination of side chains of electronegatively substituted aromatic compounds with dichlorine monoxide.... | 10/07/1980 |
| 4222947 | Anthrachinone dyestuffs Dyestuffs, which are free from nitro groups and sulphonic acid groups, of the formula wherein F denotes an anthraquinone nucleus which contains at least one auxochromic group in the -position, Z denotes a direct bond or a bridge member, A denotes alkyle... | 09/16/1980 |
| 4141682 | Transfer dyeing with 1-hydroxy-2-alkyl-4-anilino anthraquinone dyes A process for the transfer color printing of synthetic textile materials wherein the dyestuff used is a 1-hydroxy-2-(optionally substituted) lower alkyl-4-anilinoanthraquinone optionally having from 1 to 3 substituents in the anilino nucleus. Preferably t... | 02/27/1979 |
| 4137243 | Polymeric anthraquinone derived colorants Polymeric anthraquinone derived colorants having improved light and alkali fastness properties represented by the formula: ##STR1## wherein R1 is a member selected from the group consisting of H, OH, a halogen, NH2, NO2 | 01/30/1979 |
| 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 |
| 4105680 | Process for the preparation of 1-aminoanthraquinones A selective process for the preparation of 1-aminoanthraquinones by decarboxylation of the corresponding 1-aminoanthraquinone-2-carboxylic acid in an alkaline solution with an alkali metal hydrosulfite.... | 08/08/1978 |
| 4080369 | Disperse anthraquinone dyestuffs 1,4-Di(hydroxy- or amino-)-2-[alkoxycarbonylmethylene(oxy or amino)phenyl(oxy)]anthraquinones. Disperse dyestuffs for synthetic textile materials, especially aromatic polyesters.... | 03/21/1978 |
| 4078890 | Process for the dyeing and printing of polyester material The invention relates to a process for the dyeing and printing of polyester material in a weakly acid, neutral or alkaline solution of at least one altered dispersion dyestuff water-soluble at an intermediate stage and containing a carbacyl group which is... | 03/14/1978 |
| 4046785 | Process for preparing aminoanthraquinones A process for preparing aminoanthraquinones of high purity, which comprises catalytically hydrogenating nitroanthraquinones in the suspended state in an aqueous medium in the presence of a hydrogenating catalyst. In a preferred embodiment, the catalytic h... | 09/06/1977 |
| 4016181 | Dyestuff process A new overall method of producing chlorinated or brominated compounds of 2-(haloaryl)-4,5-diamino chrysazines from chrysazine without the need for isolation of intermediates at any point during the reaction; and to the novel products produced thereby, whi... | 04/05/1977 |
| 4008222 | Anthraquinone dyestuffs Anthraquinone dyestuffs suitable for use in dyeing and printing synthetic fiber material, particularly polyesters, and process for their preparation which comprises reacting an anthraquinone which contains, in at least one ଲ-position, a reactive gro... | 02/15/1977 |
| 3936477 | Blue anthraquinoid disperse dyes, their production and use Anthraquinoid disperse dyes of formula: ##SPC1## In which X is hydrogen, chloro, methyl, methoxy or ethoxy; Y is alkylene of two to eight carbon atoms or --(CH2)2 --O--(CH2)2 --; and- Z is CN or COOH. The dyes give d... | 02/03/1976 |
