Patents by Inventor Werner Stegmann
Werner Stegmann 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: 5258540Abstract: Compounds of formula Ia ##STR1## in which R.sub.1 is hydrogen, R.sub.2 is methyl, tert-butyl or cyclohexyl, and R.sub.7 and R.sub.8 independently of one another are C.sub.1 -C.sub.18 alkyl, phenyl or C.sub.7 -C.sub.18 alkylphenyl are novel compounds having utility as stabilizers.Type: GrantFiled: July 20, 1992Date of Patent: November 2, 1993Assignee: Ciba-Geigy CorporationInventors: Paul Dubs, Werner Stegmann, Reto Luisoli, Roger Martin
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Patent number: 5240975Abstract: Liquid substituted 2H-benzotriazole mixtures are prepared by alkylation with concomitant dealkylation, fragmentation and realkylation of 2-(2-hydroxy-5-alkylphenyl)-2H-benzotriazoles or of 2-(2-hydroxy-3,5-dialkylphenyl)-2H-benzotriazoles with straight or branched alkenes of 8 to 30 carbon atoms in the presence of an acid catalyst at 100.degree.-200.degree. C. The liquid mixtures exhibit outstanding efficacy in protecting organic substrates from light induced deterioration as well as good resistance to loss by volatilization or exudation during the processing of stabilized compositions at elevated temperatures.Type: GrantFiled: December 4, 1991Date of Patent: August 31, 1993Assignee: Ciba-Geigy CorporationInventors: Roland A. E. Winter, Robert E. Detlefsen, Werner Stegmann, Reto Luisoli, David Leppard
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Patent number: 5229521Abstract: Compounds of formula ##STR1## wherein R.sub.1 is hydrogen alkyl, alkoxy, phenyl, phenylaklyl or halogen, and R.sub.2 is alkyl phenyl, phenylaklyl or cycloalkyl, are prepared by reacting a compound of formula ##STR2## with a compound of formula ##STR3## wherein R.sub.3 and R.sub.4 are alkyl, and formaldehyde, in a one-pot process in the absence of a solvent.Type: GrantFiled: October 23, 1992Date of Patent: July 20, 1993Assignee: Ciba-Geigy CorporationInventors: Reto Luisoli, Werner Stegmann
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Patent number: 5157141Abstract: A process for the preparation of compounds of the general formula I ##STR1## in which R.sub.1 is hydrogen or methyl, R.sub.2 and R.sub.3 independently of one another are C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.8 cycloalkyl, phenyl, C.sub.7 -C.sub.9 phenylalkyl or halogen, R.sub.2 is additionally hydrogen and R.sub.7 and R.sub.8 independently of one another are C.sub.1 -C.sub.18 alkyl, phenyl or C.sub.7 -C.sub.18 alkylphenyl, which comprises reacting a phenol of the formula II ##STR2## in which R.sub.1 to R.sub.3 have the meaning described above, with formaldehyde or paraformaldehyde, an amine of the formula IIINR.sub.4 R.sub.5 R.sub.6 IIIin which R.sub.4 is C.sub.1 -C.sub.4 alkyl and R.sub.5 and R.sub.6 independently of one another are hydrogen or C.sub.1 -C.sub.4 alkyl, and a phosphite of the formula IV ##STR3## in which R.sub.7 and R.sub.8 have the meaning described above and R.sub.9 has the meaning given for R.sub.7 and R.sub.8, at a temperature of 0.degree.-200.degree. C.Type: GrantFiled: November 21, 1990Date of Patent: October 20, 1992Assignee: Ciba-Geigy CorporationInventors: Paul Dubs, Werner Stegmann, Reto Luisoli, Roger Martin
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Patent number: 5110978Abstract: A process for the preparation of compounds of formula I ##STR1## by reacting a phenol with formaldehyde and a thiol of formula HS--C.sub.n H.sub.2n --COO--R.sub.3 under excess pressure and in the presence of dimethylamine.The symbols R.sub.1 and R.sub.2 are independently alkyl, R.sub.3 is alkyl or alkyl interrupted by --O-- or --S--, and n is 1 or 2.Type: GrantFiled: December 21, 1990Date of Patent: May 5, 1992Assignee: Ciba-Geigy CorporationInventors: Werner Stegmann, Reto Luisoli
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Patent number: 5095062Abstract: Liquid substituted, 2H-benzotriazole mixtures are prepared by alkylation with concomitant dealkylation, fragmentation and realkylation of 2-(2-hydroxy-5-alkylphenyl)-2H-benzotriazoles or of 2-(2-hydroxy-3,5-dialkylphenyl)-2H-benzotriazoles with straight or branched alkenes of 8 to 30 carbon atoms in the presence of an acid catalyst at 100.degree.-200.degree. C. The liquid mixtures exhibit outstanding efficacy in protecting organic substrates from light induced deterioration as well as good resistance to loss by volatilization or exudation during the processing of stabilized compositions at elevated temperatures.Type: GrantFiled: September 5, 1990Date of Patent: March 10, 1992Assignee: Ciba-Geigy CorporationInventors: Roland A. E. Winter, Robert E. Detiefsen, Werner Stegmann, Reto Luisoli, David Leppard
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Patent number: 5047591Abstract: Bis-(amino-nitrophenyl)-methane can be produced in one stage with an approximately quantitative yield by condensing o-nitraniline and formaldehyde in water at a temperature of between 20.degree. and 40.degree. C. in the presence of sulfuric acid, and subsequently rearranging the formed methylene-bis-(o-nitraniline) by treatment of the reaction mixture at a temperature of between 90.degree. and 100.degree. C.Type: GrantFiled: September 6, 1988Date of Patent: September 10, 1991Assignee: Ciba-Geigy CorporationInventor: Werner Stegmann
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Patent number: 4973701Abstract: Liquid substituted 2H-benzotriazole mixtures are prepared by alkylation with concomitant dealkylation, fragmentation and realkylation of 2-(2-hydroxy-5-alkylphenyl)-2H-benzotriazoles or of 2-(2-hydroxy-3,5-dialkylphenyl)-2H-benzotriazoles with straight or branched alkenes of 8 to 30 carbon atoms in the presence of an acid catalyst at 100.degree.-200.degree. C. The liquid mixtures exhibit outstanding efficacy in protecting organic substrates from light induced deterioration as well as good resistance to loss by volatilization or exudation during the processing of stabilized compositions at elevated temperatures.Type: GrantFiled: April 11, 1988Date of Patent: November 27, 1990Assignee: Ciba-Geigy CorporationInventors: Roland A. E. Winter, Werner Stegmann, Reto Luisoli, David Leppard, Roland A. E. Winter, Robert E. Detlefsen
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Patent number: 4921966Abstract: A process for the preparation of a mixture of 2-(2-hydroxyphenyl)benzotriazole which is liquid at room temperature by alkylating 2-(2-hydroxy-5-methylphenyl)benzotriazole with a C.sub.8 -C.sub.14 .alpha.-olefin in the melt at elevated temperature, in the presence of sulfonic acid as catalyst, comprising using not less than 0.5 mol of the acid catalyst and 1.5-3 mol of .alpha.-olefin per mol of 2-(2-hydroxy-5-methylphenyl)benzotriazole, carrying out the alkylation in the temperature range from 165.degree. to 190.degree. C., separating the crude product phase upper phase) from the sulfonic acid phase, and working up said crude product phase by distillation by means of a thin-film evaporator, a thin-film evaporator fitted with a distillation column, or a short path distillation apparatus.Type: GrantFiled: December 14, 1988Date of Patent: May 1, 1990Assignee: Ciba-Geigy CorporationInventors: Werner Stegmann, Reto Luisoli
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Patent number: 4874885Abstract: There is disclosed a process for the preparation of compounds of formula I or II ##STR1## from phenols by reaction with formaldehyde and mercaptans in the presence of mono-, di- or trimethylamine or mono- or diethylamine.The symbols R.sub.1 is alkyl, hydroxy or alkoxycarbonyl substituted alkyl; alkyl; aryl, cycloalkyl or aralkyl, R.sub.2 is hydrogen, alkyl, alkenyl or halogen, R.sub.3 and R.sub.4 are independently alkyl, allyl, cycloalkyl, phenyl, benzyl, halogen or --CH.sub.2 --S--R.sub.1, Z.sub.1 is --S-- or alkylene, and Z.sub.2 is hydrogen, alkyl or --CH.sub.2 --S--R.sub.1.The mercaptomethylphenols are valuable antioxidants for plastics, elastomers, mineral oils and synthetic lubricants.Type: GrantFiled: December 15, 1987Date of Patent: October 17, 1989Assignee: Ciba-Geigy CorporationInventors: Werner Stegmann, Hans R. Meier, Samuel Evans, Roger Martin, Reto Luisoli
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Patent number: 4863982Abstract: Compounds of the formula I ##STR1## R.sup.4 is C.sub.5 -C.sub.7 -cycloalkyl which can be substituted by C.sub.1 -C.sub.4 -alkyl, and R.sup.5 to R.sup.9 are independently of one another C.sub.1 -C.sub.18 alkyl, unsubstituted or C.sub.1 -C.sub.4 -alkyl-substituted C.sub.5 -C.sub.7 -cycloalkyl, phenyl, benzyl or allyl, are suitable for stabilizing organic material against thermal, oxidative and/or actinic degradation.Type: GrantFiled: July 6, 1988Date of Patent: September 5, 1989Assignee: Ciba-Geigy CorporationInventors: Werner Stegmann, Eduard Troxler, Peter Hofmann, Hans-Rudolf Meier, Paul Dubs
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Patent number: 4691058Abstract: The invention relates to a novel process for producing compounds of the formula I ##STR1## in which R.sup.1 is for example phenyl, and R.sup.2 and R.sup.3 are for example cyclohexyl. With application of the phase-transfer catalysis method, a corresponding compound of the formula II ##STR2## is reacted, in the presence of water, with hydroxide ions, especially with alkali metal hydroxide or alkaline-earth metal hydroxide.Type: GrantFiled: February 14, 1985Date of Patent: September 1, 1987Assignee: Ciba-Geigy CorporationInventor: Werner Stegmann
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Patent number: 4623745Abstract: Compounds of the formula I ##STR1## wherein R.sup.1 and R.sup.2 independently of one another are each tert-butyl, R.sup.3 is C.sub.1 -C.sub.20 -alkyl, or C.sub.2 -C.sub.20 -alkyl interrupted by --O-- or --S--, and n is the number 1 or 2, can be obtained, with a very high degree of yield and purity, by reaction of a phenol of the formula II ##STR2## with formaldehyde and a mercaptan of the formula IIIR.sup.3 OOC--C.sub.n H.sub.2n --SH (III)in the presence of catalytic amounts of a primary or secondary amine. Such compounds are stabilizers for organic materials.Type: GrantFiled: July 16, 1985Date of Patent: November 18, 1986Assignee: Ciba-Geigy CorporationInventors: Siegfried Rosenberger, Werner Stegmann