The Acyclic Carbon, To Which The Other Two Acyclic Carbons Are Bonded, Is Between The Hetero Ring And The Azo Group Patents (Class 534/742)
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Patent number: 7999086Abstract: The invention provides a method of conditioning azo pigments containing carboxylic ester groups, using glycol monoalkyl ethers or mixtures of glycols and glycol dialkyl ether.Type: GrantFiled: January 30, 2009Date of Patent: August 16, 2011Assignee: Clariant Finance (BVI) LimitedInventors: Jens Paetzold, Carsten Plueg, Frank Alfter
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Publication number: 20110118214Abstract: A compound of Formula I: (I) has activity as a cannabinoid receptor antagonist. In Formula 1, R1 is unsubstituted or substituted aryl, unsubstituted or substituted cycloalkyl, unsubstituted or substituted heterocyclyl, unsubstituted or substituted aralkyl, or unsubstituted or substituted heteroaryl; R2 is unsubstituted or substituted alkyl, unsubstituted or substituted aryl, or unsubstituted or substituted heteroaryl; and R3 is unsubstituted or substituted alkyl, unsubstituted or substituted aralkyl, or unsubstituted or substituted heteroaralkyl; with the proviso that at least one of Ri and R3 is other than unsubstituted aralkyl or R2 is other than unsubstituted aryl.Type: ApplicationFiled: October 31, 2008Publication date: May 19, 2011Inventors: Xiangqun Xie, Jianzhong Chen, Yuxun Zhang
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Patent number: 7709614Abstract: Novel crystalline modifications (eta, theta, iota, kappa) of the C.I. Pigment Yellow 181, obtained when one of the known phases or another inventive phase of said pigment is treated with specific solvents. The novel crystalline phases are characterized by yellow shades and excellent coloring properties.Type: GrantFiled: June 15, 2005Date of Patent: May 4, 2010Assignee: Clariant Produkte (Deutschland) GmbHInventors: Martin U. Schmidt, Gerald Mehltretter
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Publication number: 20090087769Abstract: Finely divided azo dye and process for producing the same. The invention relates to a finely divided mono-azo pigment of formula (I) in the beta crystal phase (I), characterised in that at least 90 % by weight of the particles have a stoke equivalent diameter equal to or smaller than 130 nm.Type: ApplicationFiled: April 20, 2006Publication date: April 2, 2009Inventors: Joachim Weber, Magali Venera, Karl-Heinz Schweikart, Gerhard Wilker, Frank Alfter
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Patent number: 6706863Abstract: The present invention provides Pigment Yellow 180 having an excellent transparency produced by using a fine slurry of 5-acetoacetylamino-benzimidazolone as a coupling component when Pigment Yellow 180 is produced by coupling reaction of 5-acetoacetylamino-benzimidazolone and diazo component obtained by diazotization of 1,2-bis(2-aminophenoxy)ethane.Type: GrantFiled: August 15, 2002Date of Patent: March 16, 2004Assignee: Clariant Finance (BVI) LimitedInventors: Isao Hashimoto, Noboru Tsuda, Hiroshi Ohsawa, Tomonori Okazaki, Manabu Shiga, Kohei Ohtsuki
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Publication number: 20020062012Abstract: A compound shown by the general formula [1]: 1Type: ApplicationFiled: September 19, 2001Publication date: May 23, 2002Applicant: WAKO PURE CHEMICAL INDUSTRIES, LTD.Inventors: Suguru Kondo, Seiji Hirose, Kazuo Shiraki
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Patent number: 6150509Abstract: A water-insoluble yellow monoazo pigment has the following formula (I): ##STR1##Type: GrantFiled: November 12, 1999Date of Patent: November 21, 2000Assignee: Dominion Colour CorporationInventors: Alan Gray, Henry Lui, Dorothy-Grace Manarang
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Patent number: 6028178Abstract: Azo pigment of the formula (1) ##STR1## which has a specific surface area of the pigment powder of more than 45 m.sup.2 /g.The azo pigment is particularly suitable as colorant in electrophotographic toners and developers, and in powder coatings and electret materials.Type: GrantFiled: July 26, 1999Date of Patent: February 22, 2000Assignee: Clariant GmbHInventors: Hans Joachim Metz, Rudiger Baur, Hans-Tobias Macholdt
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Patent number: 5910577Abstract: Compounds of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 are identical or different and are Cl, COO(C.sub.1 -C.sub.4)-alkyl, CONH.sub.2, CONCH.sub.3, CON(CH.sub.3).sub.2 or SO.sub.2 NRR', where R and R' are identical or different and are hydrogen, C.sub.1 -C.sub.4 -alkyl or phenyl, it being possible for phenyl to be substituted by methyl, ethyl, methoxy, ethoxy or halogen,R.sup.3 is hydrogen, methyl, methoxy, ethoxy, chloro or bromo, andR.sup.4 is hydrogen, C.sub.1 -C.sub.3 -alkyl, chloro or bromo,are useful yellow pigments with high light fastness and weather fastness properties.Type: GrantFiled: July 31, 1998Date of Patent: June 8, 1999Assignee: Clariant GmbHInventors: Hans Joachim Metz, Joachim Weber
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Patent number: 5756691Abstract: Water-insoluble azo colorant based on N-acetoacetyldehydrothiotoluidine Compound of the formula (I) ##STR1## in which R.sub.1 and R.sub.2 independently of one another are a hydrogen atom, C.sub.1 -C.sub.4 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, a benzyl group, an unsubstituted phenyl group or a substituted phenyl group with 1 to 5, preferably 1 to 3, substituents from the group consisting of C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, halogen, nitro, cyano, hydroxyl, CF.sub.3, CONH.sub.2, CONH(C.sub.5 -C.sub.6 -cycloalkyl), CON(C.sub.1 -C.sub.4 -alkyl).sub.2, CONH(C.sub.1 -C.sub.4 -alkyl), COO(C.sub.1 -C.sub.4 -alkyl), COO(C.sub.5 -C.sub.6 -cycloalkyl) and CONH(phenyl),R.sub.3 is a hydrogen atom, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, halogen, nitro, cyano, hydroxyl, CF.sub.3, COO(C.sub.1 -C.sub.4 -alkyl) or COO(C.sub.5 -C.sub.6 -cycloalkyl) andn is 1 or 2.Type: GrantFiled: June 13, 1997Date of Patent: May 26, 1998Assignee: Hoechst AktiengesellschaftInventors: Joachim Weber, Hans Joachim Metz
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Patent number: 5484901Abstract: Isoindolineazo pigments of the general formula I ##STR1## where A is the radical of an active-methylene compound or .dbd.S;L is substituted or unsubstituted 1,4-phenylene, 1,3-phenylene or 1,5-naphthylene;K is the radical of a coupling component K--H; and the benzene ring D is optionally substituted,are useful for pigmenting high polymer organic materials.Type: GrantFiled: March 22, 1995Date of Patent: January 16, 1996Assignee: BASF AktiengesellschaftInventors: Michael Krapp, Georg Henning
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Patent number: 4997920Abstract: Compounds of the formulae I and II ##STR1## in which A is a radical of the formulae III, IV or V ##STR2## R.sub.1 and R.sub.4 are --H or --Cl, R.sub.2 and R.sub.5 are --H, halogen, --NO.sub.2, --CN, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 alkoxy, --CF.sub.3 or phenyloxy which is unsubstituted or substituted by one or two chlorine atoms and/or one or two methyl or methoxy groups, and R.sub.3 is alkyl having at least 10 C atoms, X is a radical of the formulae --NH--, --O--, ##STR3## n is the number 1 or 2, Y is the radical of the formulae --COO--, --OOC--, --CONH-- or --NHCO-- or a radical of the formulae ##STR4## in which R.sub.1 and R.sub.2 are as defined above, D is an aromatic heterocyclic 5- or 6-membered ring, in which the ring contains 1 or 2 N atoms and may additionally contain an O atom or S atom, Z is --H, --Br, --OCH.sub.3, --CN or --NO.sub.2 and X.sub.1 and X.sub.2, independently of one another, are --H, halogen, --CH.sub.3, --OCH.sub.3, --OC.sub.2 H.sub.5 or --NO.sub.2 and X.sub.Type: GrantFiled: September 11, 1989Date of Patent: March 5, 1991Assignee: Ciba-Geigy CorporationInventors: Stefan Hari, Olof Wallquist, Jost von der Crone
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Patent number: 4935502Abstract: When a diamine of the formula ##STR1## in which n is 1 to 4, is bis-diazotized and the resulting bis-diazo compound is coupled with 2 moles of one or more coupling components of the formula ##STR2## in which R.sup.1 is hydrogen, chlorine, bromine, methyl or methoxy and R.sup.2 is hydrogen or, if R.sup.1 is hydrogen, also methyl or ethyl, disazo compounds are obtained which are colorants. Due to their high fastness to light and to migration and their heat stability and dispersibility, these compounds are useful for pigmenting high molecular weight materials, especially polyolefins.Type: GrantFiled: August 22, 1989Date of Patent: June 19, 1990Assignee: Hoechst AktiengesellschaftInventors: Rudolf Kuhne, Heinrich Hamal
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Patent number: 4906735Abstract: An improved process for the manufacture of a monoazo acetoacetylaminobenzimidazolone pigment of the formula ##STR1## by coupling the components in an aqueous medium in the presence of an oxethylation product of an alcohol or alcohol mixture having from 8 to 14 carbon atoms and 3 to 10 mols of ethylene oxide, and heating the aqueous pigment suspension after complete coupling. The pigment thus obtained avoids an after-treatment in anhydrous organic solvents and has good tinctorial strength, high hiding power and good properties with respect to flow and dispersibility.Type: GrantFiled: June 15, 1989Date of Patent: March 6, 1990Assignee: Hoechst AktiengesellschaftInventor: Klaus Hunger
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Patent number: 4870164Abstract: Symmetrical and asymmetrical disazo compounds of the formula: ##STR1## wherein: the R.sup.1 's are identical or different and are hydrogen, chlorine, bromine, methyl or methoxy;the R.sup.2 's are hydrogen, or, if the R.sup.1 's are hydrogen, the R.sup.2 's are hydrogen, methyl or ethyl, the two R.sup.2 radicals being identical or different; andn is 1 to 4and mixtures of such compounds as colorants, especially for pigmenting high molecular weight organic material.Type: GrantFiled: January 28, 1985Date of Patent: September 26, 1989Assignee: Hoechst AktiengesellschaftInventors: Rudolf Kuhne, Heinrich Hamal
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Patent number: 4847364Abstract: Methine-azo compounds of the formula ##STR1## in which A is the complement to a heterocyclic 5- or 6-membered ring which has a quaternized N atom as a ring member, which can contain further hetero atoms and which can be substituted or/and be fused with carbocyclic or heterocyclic rings,R is hydrogen, cyano or C.sub.2 --C.sub.3 -alkylene which is bonded to an N atom of ring A to form a 5- or 6-membered ring,B is substituted or unsubstituted phenylene or naphthylene,X.sup..crclbar. is an anion andKK is the radical of an open-chain coupling component which contains active methylene groups, except that, if A is the complement to a pyridinium ring, KK cannot be the radical of acetoacetanilide which is unsubstituted or alkyl-substituted in the aniline ring.They are suitable for use as dyes for dyeing and printing cationically dyeable substrates, in particular paper.Type: GrantFiled: June 16, 1987Date of Patent: July 11, 1989Inventor: Peter Mockli
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Patent number: 4843149Abstract: A monoazo compound, or a salt thereof, represented by the formula, ##STR1## wherein D is a sulfophenyl group substituted with a methyl, ethyl, methoxy, ethoxy, phenoxy, acetylamino, pripionylamino, benzoylamino, carboxybenzoylamino, maleinylamino or succinylamino group, a naphthyl group substituted with two or three sulfo groups of a group of the formula ##STR2## any one of X.sub.1 or X.sub.2 is a sulfo group and the other is a methoxy or ethoxy group, Y is a fluorine or chlorine atom or an arylamino group substituted with one or two sulfo groups, R is a hydrogen atom or an unsubstituted or substituted lower alkyl group, A is an unsubstituted or substitued phenylene or naphthylene group, and Z is --SO.sub.2 CH.dbd.CH.sub.2 or --SO.sub.2 CH.sub..sub.2 CH.sub.2 Z.sub.1 in which Z.sub.1 is a group capable of being split by the action of an alkali, which is useful as a fiber-reactive dye for dyeing materials in a greenish yellow color excellent in various fastness properties.Type: GrantFiled: November 13, 1985Date of Patent: June 27, 1989Assignee: Sumitomo Chemical Company, LimitedInventors: Yutaka Kayane, Hirokazu Sawamoto, Takashi Omura, Naoki Harada, Akira Takeshita
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Patent number: 4826976Abstract: This invention relates to a color-shifted dye compounds containing at least one thermally unstable carbamate moiety which are useful in thermal imaging. These compounds may be represented by the formula [M--(X).sub.q ].sub.p D wherein M is a carbamate moiety; X is --N.dbd., --SO.sub.2 -- or --CH.sub.2 --; D taken with X and M represents the radical of a color-shifted organic dye, said carbamate moiety M comprising a tert-alkoxycarbonyl group, ##STR1## wherein R' is halomethyl or alkyl.Type: GrantFiled: December 18, 1987Date of Patent: May 2, 1989Assignee: Polaroid CorporationInventors: Alan L. Borror, Ernest W. Ellis, Donald A. McGowan
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Patent number: 4780533Abstract: A disazo pigment is prepared by coupling the tetrazo compound of 3,3'-dichlorobenzidine with an acetoacetanilide compound which is other than those represented by the below-described general formula (I) and is free of water-soluble groups. In the present invention, about 0.5-50 mole % of the acetoacetanilide compound is replaced by a compound represented by the following general formula (I): ##STR1## wherein R means a methyl, ethyl, propyl or butyl group or a substituted or unsubstituted phenyl group.Type: GrantFiled: February 9, 1987Date of Patent: October 25, 1988Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.Inventors: Naonori Takami, Tetsuo Fukuda, Takeshi Uehara
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Patent number: 4767844Abstract: An azo lake pigment is obtained by coupling an aromatic diazo component having a sulfonic acid group with a mixture of 2-hydroxy-3-naphthoic acid and a 2-hydroxy-3-naphthoic acid derivative represented by formula [I] ##STR1## wherein R represents a hydrogen atom, a naphthalene residue, a cyclohexyl group, or a group of the formula ##STR2## in which each of X, Y and Z represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, a halogen atom, an acetylamino group, a benzoylamino group, a carbomoyl group or a phenylcarbamoyl group, and X and Y together may form a cyclized benzimidazolone, benzthiazole or benzoxazole group,and laking the resulting dye with an alkaline earth metal salt or a manganese salt.Type: GrantFiled: August 21, 1987Date of Patent: August 30, 1988Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Hirohito Ando, Zenji Takada, Shigeto Aoki, Yuko Shigeta
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Patent number: 4764599Abstract: Sulfo-free compounds of the formula ##STR1## where R is hydrogen or C.sub.1 -C.sub.4 -alkyl andK.sup.1 and K.sup.2 independently of one another are a radical of a coupling component, and the rings A and B may furthermore be monosubstituted or polysubstituted by fluorine, chlorine, bromine, nitro, methyl, trifluoromethyl, ethyl, acetyl, benzoyl, a carboxylic ester group, unsubstituted or substituted carbamyl or sulfamyl, an aryl sulfonate group, C.sub.1 -C.sub.4 -alkylsulfonyl, unsubstituted or substituted phenylsulfonyl, cyano or acylamino or a fused ring, are very useful as pigments for coloring printing inks, surface coatings or plastics.Type: GrantFiled: September 30, 1986Date of Patent: August 16, 1988Assignee: BASF AktiengesellschaftInventors: Horst Colberg, Erwin Hahn
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Patent number: 4736021Abstract: There are described azo compounds of the formula ##STR1## wherein K is an optionally quaternized basic group,X is the radical COOR, in which R is an alkyl group or a substituted or unsubstituted phenyl group, or X is the radical CONHR', in which R' is an alkyl group or a substituted or unsubstituted phenyl group; and wherein the benzene rings B and/or D can be further substituted;and the use thereof as dyes for the dyeing of textile materials, and particularly for the dyeing of paper of all types, especially bleached, lignin-free, unsized paper.Type: GrantFiled: September 13, 1982Date of Patent: April 5, 1988Assignee: Ciba-Geigy CorporationInventors: Jean-Marie Adam, Pierre Galafassi
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Patent number: 4732975Abstract: Compounds of the general formula ##STR1## in which R.sup.1 and R.sup.2 are identical or different and denote hydrogen, chlorine or bromine, methyl, ethyl, methoxy, ethoxy or nitro and K denotes identical or different radicals of enolizable ketomethylene compounds which do not contain groups imparting solubility in water, are obtained by coupling one equivalent of the bisdiazonium compound obtained by bisdiazotizing the diamine of the formula ##STR2## in which R.sup.1 and R.sup.2 have the meaning mentioned above, with 2 equivalents of one or more compounds of the formula KH in which K has the meaning mentioned above. These disazo compounds are pigments which have a high tinctorial strength and good fastness to migration, light, heat and chemicals.Type: GrantFiled: December 21, 1981Date of Patent: March 22, 1988Assignee: Hoechst AktiengesellschaftInventor: Manfred Pesenacker
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Patent number: 4686287Abstract: Disazo compounds of the formula I ##STR1## in which X and Y are identical or different and denote hydrogen, bromine, chlorine, methyl, methoxy, ethoxy, nitro, trifluoromethyl, carbomethoxy or carboethoxy, A.sup.1 and A.sup.2, independently of each other, represent hydrogen, methyl or ethyl and Z.sup.1 and Z.sup.2 in the 6- or 7-position of the heteroaromatic ring system, independently of each other, represent hydrogen, bromine, chlorine, methyl, methoxy, ethoxy, carbomethoxy, carboethoxy or nitro, are obtained by coupling a monodiazotized p-diaminobenzene substituted by X and Y analogously to the formula I with a 5-acetoacetylaminobenzimidazolone which carries the radicals A.sup.1 and Z.sup.2 analogously to the formula I, and reacting the resulting aminoazo compound after another diazotization with a 5-acetoacetylaminobenzimidazolone which carries the radicals A.sup.2 and Z.sup.2 analogously to the formula I, to give the disazo compound of the formula I.Type: GrantFiled: April 3, 1985Date of Patent: August 11, 1987Assignee: Hoechst AktiengesellschaftInventor: Klaus Hunger
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Patent number: 4677200Abstract: The invention relates to aminoazo compounds of the formula I ##STR1## in which X and Y are identical or different and denote hydrogen, chlorine, bromine, methyl, methoxy, ethoxy, nitro, trifluoromethyl, carbomethoxy or carboethoxy, A represents hydrogen, methyl or ethyl, and Z in the 6- or 7-position of the heteroaromatic ring system is hydrogen, chlorine or bromine, methyl, methoxy, ethoxy, carbomethoxy, carboethoxy or nitro.The compounds of the formula I are prepared by coupling a monodiazotized p-diaminobenzene substituted by X and Y analogously to the formula I with a 5-acetoacetylaminobenzimidazolone which carries the radicals A and Z analogously to the formula I. In the case where X, Y or Z does not denote a nitro group, it is possible to use in place of the p-diaminobenzene derivative a p-aminonitrobenzene derivative which is disubstituted by X and Y in the 2- and 5-positions.Type: GrantFiled: April 3, 1985Date of Patent: June 30, 1987Assignee: Hoechst AktiengesellschaftInventor: Klaus Hunger
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Patent number: 4665163Abstract: Diaryl pigments having an excellent stability to heat are obtained by carrying out the coupling of bis-diazotized 3,3'-dichloro-4,4'-diaminobiphenyl with acetoacetanilides in the presence of an added quantity of acetoacetanilides which are monosubstituted or disubstituted in the 3-position or 4-position of the nucleus. As a result of their good heat stability, these pigments are particularly suitable for pigmenting plastics having processing temperatures above 200.degree. C.Type: GrantFiled: June 23, 1983Date of Patent: May 12, 1987Assignee: Hoechst AktiengesellschaftInventors: Klaus Hunger, Heinrich Frolich, Hans-Joachim Lenz
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Patent number: 4664714Abstract: A pigment composition consisting of 100 parts by weight of a pigment, and from 0.1 to 30 parts by weight of a pigment dispersant of formula ##STR1## in which Q is (a) an anthraquinone dye or pigment radical, (b) an azo dye or pigment radical, (c) a benzimidazolone dye or pigment radical, (d) a phthalocyanine dye or pigment radical, (e) a quinacridone dye or pigment radical, (f) a dioxazine dye or pigment radical, (g) an anthrapyrimidine dye or pigment radical, (h) an anthanthrone dye or pigment radical, (i) an indanthrone dye or pigment radical, (j) a falvanthrone dye or pigment radical, (k) a pyranthrone dye or pigment radical, (l) a perinone dye or pigment radical, (m) a perylene dye or pigment or (n) a thioindigo dye or pigment radical; X is a direct bonds, --CH.sub.2 --; ##STR2## Y.sub.1 is NH or --O--; Z is in which Y.sub.2 is --NH-- or --O--, or --NH--X--Q when n is 1; R.sub.1 and R.sub.Type: GrantFiled: April 10, 1985Date of Patent: May 12, 1987Assignee: Toyo Ink Manufacturing Co., Ltd.Inventors: Hiromitsu Katsura, Shigeyuki Ehashi, Motohiko Kashioka, Makoto Sakamoto
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Patent number: 4625017Abstract: Metallizable azo dyes of the formula I ##STR1## wherein A is the radical of a diazo component of the benzene or naphthalene series, which diazo component contains in the o-position with respect to the azo group a metallizable hydroxyl group,R is methyl or chloromethyl, or phenyl which can be substituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or halogen,R.sub.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl,R.sub.2 is hydrogen or methyl,n is 0 or 1, andm is 0, 1, 2 or 3.In the form of their heavy-metal complexes, the dyes are suitable in particular for dyeing leather. These dyes are deeply colored, cover well, have good substantivity and build-up while simultaneously having good fastness properties.Type: GrantFiled: November 12, 1982Date of Patent: November 25, 1986Assignee: Ciba-Geigy CorporationInventor: Alois Puntener
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Patent number: 4607096Abstract: Azo pigments are obtained by diazotizing a diazotizable aromatic amine without solubilizing groups in anhydrous dipolar aprotic water-miscible solvents with the stoichiometric amount or a small excess of nitrosylsulfuric acid or nitrosyl chloride, coupling the diazonium compound so obtained with a coupling component and isolating the pigment obtained in usual manner. This process is carried out in homogeneous solution and yields azo pigments the advantageous properties of which cannot be achieved by other methods, for example, the excellent purity, grain softness, narrow range of particle size distribution, excellent dispersibility in plastic materials and color lacquers, high gloss and excellent opacity in color lacquers.Type: GrantFiled: November 4, 1982Date of Patent: August 19, 1986Assignee: Hoechst AktiengesellschaftInventors: Josef Landler, Klaus Hunger, Erhard Worfel
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Patent number: 4562247Abstract: There are described azo compounds of the formula ##STR1## wherein D.sub.1 and D.sub.2 are each the radical of a diazo component, R is C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 alkyl substituted by C.sub.1 -C.sub.4 -alkoxy or halogen or is phenyl or phenyl substituted by C.sub.1 -C.sub.4 -alkyl, halogen or C.sub.1 -C.sub.4 alkoxy, and Y is a basic or cationic group. These azo compounds can be used as dyes for dyeing and printing natural and synthetic, cationically dyeing substrates, particularly textile materials and paper.Type: GrantFiled: May 29, 1984Date of Patent: December 31, 1985Assignee: Ciba Geigy CorporationInventor: Visvanathan Ramanathan
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Patent number: 4504416Abstract: When diazotizing a p-amino-benzoic acid anilide, the anilide nucleus of which is substituted in its paraposition by carbamoyl, acetamino or chloro and coupling it onto 5-acetoacetylamino-benzimidazolone-(2) monoazo pigments are obtained having a high fastness to light, solvents, overlacquering and bleeding and a very high heat resistance.Type: GrantFiled: April 21, 1981Date of Patent: March 12, 1985Assignee: Hoechst AktiengesellschaftInventors: Klaus Hunger, Manfred Pesenacker