Patents by Inventor Adolf Kroh
Adolf Kroh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5368641Abstract: A process for the preparation of 2,9-dimethylquinacridone pigments or mixed crystal pigments or mixtures of 2,9-dimethylquinacridone and quinacridones which in the two outer fused benzene rings can be substituted, characterized by the form of their crystalline particles having an average ratio of length to width of <2:1 and an average particle size of <0.4 .mu.m, by adding to the solution of 2,9-dimethylquinacridone before or during the finishing of the corresponding crude quinacridones of the quinacridones mentioned in water or solvent mixtures at temperatures from about 60.degree. to about 200.degree. C., in each case a compound of the general formula (I) ##STR1## in an amount of about 1 to 20% by weight, in which Q is a quinacridone radical which is unsubstituted or substituted, Y is an --NR.sup.4 R.sup.5 group or the radical of a five-, six- or seven-membered heterocycle which contains one to three hetero atoms and can be substituted, R and R' are hydrogen or alkyl, and R.sup.1 to R.sup.Type: GrantFiled: December 22, 1992Date of Patent: November 29, 1994Assignee: Hoechst AGInventors: Erwin Dietz, Adolf Kroh
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Patent number: 5137576Abstract: Quinacridones having selectively adjusted triboelectric effects, which quinacridones contain about 0.05% to 100 percent by weight of triboelectrically active compounds of the general formula IQ--A--Y].sub.n (I),in which Q is a quinacridone radical which is unsubstituted or substituted by halogen atoms, alkyl, alkoxy H.sub.2 N--CO--, alkyl--NH--CO-- or (alkyl).sub.2 N--CO groups, A is a direct bond or --O--, --S--, --NR.sup.1 --, --CO--, --SO.sub.2 --, --CR.sup.2 R.sup.3 -- or arylene and Y is an --NR.sup.4 R.sup.5 group or a five-, six- or seven-membered heterocycle which contains one to three heteroatoms from the series comprising nitrogen and/or oxygen and/or sulfur and which can be substituted by alkyl, alkoxy, hydroxyphenyl, halogen, --CN, --COOH, --CO-- NRR', --SO.sub.2 --NRR', hydroxyalkyl or alkylaminoalkyl, in which R and R' together with the nitrogen atom can be a heterocycle, R and R' are hydrogen atoms or alkyl and R.sup.1 to R.sup.Type: GrantFiled: September 28, 1989Date of Patent: August 11, 1992Assignee: Hoechst AktiengesellschaftInventors: Hans-Tobias Macholdt, Adolf Kroh, Alexander Sieber, Erwin Dietz
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Patent number: 5070159Abstract: Addition compounds which are suitable as dispersants for solids in organic media are obtained from polyepoxides based on novolaks having 3 to 11 nuclei and a mixture of aliphatic, aromatic and/or heterocyclic amines.Type: GrantFiled: June 16, 1989Date of Patent: December 3, 1991Assignee: Hoechst AktiengesellschaftInventors: Erwin Dietz, Andreas Sommer, Adolf Kroh, Jurgen Hohn, Otmar Hafner, Wolfgang Rieper
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Patent number: 4986852Abstract: Pigments of the formula I ##STR1## where A is a five- or six-membered aromatic fused or unfused heterocycle which contains one to three hetero atoms from the series consisting of nitrogen and/or oxygen and/or sulfur and which is bonded to the methylene group via a carbon atom, R.sub.1 and R.sub.2 are each hydrogen, alkyl C.sub.1 -C.sub.4, alkylene C.sub.2 or aryl, and together R.sub.1 and R.sub.2 may also be an aliphatic or aromatic ring, R.sub.3 is hydrogen, alkyl C.sub.1 -C.sub.4 hydroxylkyl C.sub.1 -C.sub.3 or alkylene C.sub.2, P is the radical of a polycyclic pigment or a radical of a mix-crystal of polycyclic pigments, and n is a number from 0.0001 to 0.Type: GrantFiled: December 20, 1988Date of Patent: January 22, 1991Assignee: Hoechst AktiengesellschaftInventors: Erwin Dietz, Gustav Kapaun, Michael Kappert, Frank Prokschy, Adolf Kroh, Manfred Urban
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Patent number: 4777105Abstract: An improved magenta colorant for electrophotographic multicolor recording processes, comprising mix-crystals from 95 to 60 parts of a compound of the formula I below and 5 to 40 parts of a compound of the following formula II ##STR1## and use thereof for preparing toners or developers which are used for electrophotographic copying of subject copies and for printing electronically, optically and magnetically stored data.Type: GrantFiled: May 28, 1987Date of Patent: October 11, 1988Assignee: Hoechst AktiengesellschaftInventors: Hans-Tobias Macholdt, Alexander Sieber, Adolf Kroh
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Patent number: 4758665Abstract: A process for preparing the high-hiding form of the .gamma.-crystal modification of unsubstituted linear transquinacridone having improved tinctorial strength and producing a coating of higher gloss, which comprises carrying out (a) the known cyclization of 2,5-diphenylaminoterephthalic acid in highly concentrated polyphosphoric acid or in acid polyphosphoric acid ester to the quinacridone and/or (b) the known hydrolysis of the quinacridone melt obtained in (a) and/or (c) the known aqueous alkali extraction of the quinacridone obtained in (b) and/or (d) the known finishing of the quinacridone obtained in (a) in the presence of 0.5 to 10 percent by weight, based on quinacridone, of surface-active agents.Type: GrantFiled: November 13, 1986Date of Patent: July 19, 1988Assignee: Hoechst AktiengesellschaftInventors: Ernst Spietschka, Adolf Kroh
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Patent number: 4732618Abstract: Powdered pigments which contain at least 5% of unsubstituted quinacridone and have improved rheological properties for use in paint systems on an alkyd/melamine, acrylic/melamine, acrylate/isocyanate or polyester/isocyanate basis, both of a conventional nature and also of a modern nature of the "high solids" type, onto which--as appropriate before, during or after finishing--1 to 20% by weight of the active substance of a paint additive, prepared by reacting polyisocyanurates which still carry free isocyanate groups and are based on tolylene diisocyanate, hexamethylene diisocyanate or mixtures thereof, with (1) aliphatic mono- or poly-(hydroxycarboxylic acid) C.sub.1 -C.sub.20 -alkyl esters (degree of polymerization 2-50), (2) polyethylene glycols (molecular weight 500-1,500) and (3) 5- or 6-membered, saturated or unsaturated heterocyclic compounds which contain at least 1 nitrogen atom in the ring and reactive amino or hydroxy-C.sub.1 -C.sub.Type: GrantFiled: August 11, 1986Date of Patent: March 22, 1988Assignee: Hoechst AktiengesellschaftInventors: Ernst Spietschka, Adolf Kroh, Otmar Hafner
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Patent number: 4631330Abstract: Addition products formed from polymeric diphenylmethane 4,4'-diisocyanates, amines, monoactive and diactive polymers are suitable for use as dispersants for solids in organic media.Type: GrantFiled: December 16, 1985Date of Patent: December 23, 1986Assignee: Hoechst AktiengesellschaftInventors: Erwin Dietz, Albert Munkel, Otmar Hafner, Wolfgang Rieper, Adolf Kroh
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Patent number: 4405734Abstract: The invention relates to a process for coloring water-insoluble thermoplastic plastics with dyestuffs of the formula ##STR1## The dyestuffs are added to the melt of the thermoplastic plastic or to its precursors.Type: GrantFiled: September 3, 1982Date of Patent: September 20, 1983Assignee: Hoechst AktiengesellschaftInventors: Otto Fuchs, Adolf Kroh, Wolfgang Teige
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Patent number: 4400515Abstract: Compositions of linear trans-quinacridones containing at least one component (I) selected from unsubstituted, chloro- and methyl-substituted quinacridone and at least one component (II) selected from bis-(carbamoyl)-quinacridones, the carbamoyl groups of which are unsubstituted, N-mono-alkyl substituted or N,N-dialkyl-substituted, are pigments useful for coloring plastics and especially lacquers. These compositions are preferably prepared by joint ring closure of the corresponding 2,5-dianilino-terephthalic acids or esters.Type: GrantFiled: February 23, 1981Date of Patent: August 23, 1983Assignee: Hoechst AktiengesellschaftInventors: Otto Fuchs, Adolf Kroh
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Patent number: 4217265Abstract: Easily dispersible preparations of organic pigments are obtained by coating the pigment particles with essentially colorless aromatic compounds having a molecular structure being similar to that of the pigment and having an aliphatic chain of more than 5 carbon atoms. These preparations are stable to flocculation and useful for pigmenting hydrophilic and hydrophobic media.Type: GrantFiled: July 6, 1978Date of Patent: August 12, 1980Assignee: Hoechst AktiengesellschaftInventors: Erwin Dietz, Otto Fuchs, Robert Gutbrod, Adolf Kroh, Michael Maikowski
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Patent number: 4212975Abstract: Unsubstituted linear trans-quinacridone of the gamma-crystal modification is obtained by cyclization of 2,5-dianilino-terephthalic acid with the 2.5 to 4-fold quantity of polyphosphoric acid or of an acidic polyphosphoric acid methyl ester, followed by hydrolysis of the condensation product in water, intensive grinding of the aqueous crude quinacridone in the presence of an alcohol or ketone and heating of the resulting product to 80.degree. to 200.degree. C.Type: GrantFiled: October 19, 1978Date of Patent: July 15, 1980Assignee: Hoechst AktiengesellschaftInventors: Adolf Kroh, Otto Fuchs, Ernst Spietschka
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Patent number: 4118387Abstract: Naphthalimide-4,5-dicarboxylic acids of the formula ##STR1## or the anhydrides thereof, wherein R is alkyl having 1 to 8 carbon atoms or hydroxyalkyl or alkoxyalkyl having each 1 to 6 carbon atoms in the alkyl or alkoxy portion, which are obtained by reacting an alkali metal salt of naphthalene-1,4,5,8-tetracarboxylic acid in an aqueous solution with amines of the formulaH.sub.2 N -- R (II)wherein R has the above meaning, at a pH-value of 5.2 to 7.5 and at temperatures of 80.degree. to 160.degree. C, are intermediates for disperse dyestuffs.Type: GrantFiled: November 5, 1976Date of Patent: October 3, 1978Assignee: Hoechst AktiengesellschaftInventors: Otto Fuchs, Adolf Kroh
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Patent number: 4007192Abstract: Novel naphthalimide-4,5-dicarboxylic acids of the general formula ##STR1## or the anhydrides thereof, wherein R.sub.1 is hydrogen, hydroxy, amino, alkyl having 1 to 8 carbon atoms, hydroxyalkyl, alkoxyalkyl, aminoalkyl, monoalkylaminoalkyl, hydroxyalkoxyalkyl, alkoxyalkoxyalkyl, carbalkoxyalkyl, carboxyalkyl or phenylalkyl having each 1 to 6, preferably 1 to 4 carbon atoms in the alkyl or alkoxy portion or phenyl substituted by 1 to 3 halogen atoms, amino, alkyl, alkoxy, acylamino, acyl having each 1 to 4 carbon atoms, benzoyl or Carboxyl, and a process for preparing them, wherein naphthalene-1,4,5,8-tetracarboxylic acid, the mono- or dianhydride thereof are reacted as alkali salts in an aqueous solution with amines of the formulaH.sub.2 N - R.sub.1 (II)wherein R.sub.1 has the above meaning, at a pH-value of 5.2 - 7.5, preferably of 5.4 - 6.4, at temperatures of 80 to 160.degree. C.Type: GrantFiled: September 13, 1974Date of Patent: February 8, 1977Assignee: Hoechst AktiengesellschaftInventors: Otto Fuchs, Adolf Kroh
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Patent number: 3931186Abstract: Process for preparing naphthoylene-arylimidazo-peri-dicarboxylic acid-imide-compounds of the formula ##SPC1##Wherein R.sub.1 is hydrogen, hydroxy or amino, phenyl, alkyl having 1 to 8 carbon atoms, hydroxyalkyl, alkoxyalkyl, amino-alkyl, mono- or dialkylaminoalkyl, hydroxyalkoxyalkyl, alkoxyalkoxyalkyl, carbalkoxyalkyl, carboxylalkyl or phenyl-alkyl having each 1 to 6, preferably 1 to 4 carbon atoms in the alkyl or alkoxy portion and R is hydrogen or halogen, alkyl, alkoxy, carbalkoxy having each 1 to 4 carbon atoms, nitro, cyano, carbonamido, mono- or dialkylcarbonamido or sulfonamido, mono- or dialkylsulfonamido and n represents the integers 1 to 3, in which process naphthalimide-4,5-dicarboxylic acids of the general formula ##SPC2##Or the anhydride thereof are condensed in an aqueous medium with a diamine of the general formula ##SPC3##At temperatures of from 80.degree. to 160.degree.C. R.sub.1, R and n having the above meanings.Type: GrantFiled: September 18, 1973Date of Patent: January 6, 1976Assignee: Hoechst AktiengesellschaftInventors: Otto Fuchs, Adolf Kroh