Patents by Inventor Klaus Hestermann
Klaus Hestermann 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: 4337092Abstract: The invention relates to a corrosion-inhibiting active pigment for use in the surface protection of iron and iron alloys. The pigment consists of a mixture of calcium hydrogen phosphate dihydrate, magnesium hydrogen phosphate trihydrate and zinc oxide. More specifically, the mixture contains 2 to 98 weight % of ZnO and 98 to 2 weight % of phosphate components. These in turn contain 3 to 97 weight % of CaHPO.sub.4 .multidot.2 H.sub.2 O and 97 to 3 weight % of MgHPO.sub.4 .multidot.3 H.sub.2 O. The active pigment is suitable for use in painting compositions or lacquers.Type: GrantFiled: October 3, 1980Date of Patent: June 29, 1982Assignee: Hoechst AktiengesellschaftInventors: Klaus Hestermann, Alexander Maurer, Joachim Kandler, Gerhard Mietens, Herbert Beumling
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Patent number: 4308158Abstract: The invention provides cleaning and detergent compositions containing about:5 to 30 weight % of a surfactant and10 to 30 weight % of a builder mixture consisting of alkali metal orthophosphate, alkali metal pyrophosphate, alkali metal tripolyphosphate and alkali metal melt phosphate, wherein the ratio by weight of the sum of orthophosphate, pyrophosphate and tripolyphosphate to melt phosphate is about 30:1 to 1:30, the ratio by weight of orthophosphate to pyrophosphate is about 10:1 to 1:10, and the ratio by weight of orthophosphate to tripolyphosphate is about 20:1 to 1:20, the balance being detergent auxiliaries and addends.Type: GrantFiled: May 7, 1979Date of Patent: December 29, 1981Assignee: Hoechst AktiengesellschaftInventors: Werner Gohla, Klaus Hestermann, Joachim Kandler, Horst-Dieter Wasel-Nielen, Karl Merkenich
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Patent number: 4294621Abstract: The invention relates to the production of phosphorus-containing anticorrosive pigments with a particle size of at most 20 microns by reacting one or more calcium or magnesium compounds with phosphoric acid or acid alkali metal or ammonium phosphates by intimately mixing an aqueous suspension or solution of the reactants inside a dispersing means rotating at a speed of 3000 to 10,000 rpm. More particularly, fine pulverulent calcium and magnesium compounds are converted, with agitation, together with water and, if desired, a water-soluble alkanol to a homogeneous suspension or solution. The suspension or solution is intimately mixed, inside the dispersing means at 0.degree. to 40.degree. C. and in an approximately stoichiometric ratio, with the phosphoric acid or acid phosphate solution. Resulting and precipitated pigment is separated and dried under mild conditions while maintaining its content of water of crystallization.Type: GrantFiled: April 16, 1980Date of Patent: October 13, 1981Assignee: Hoechst AktiengesellschaftInventors: Alexander Maurer, Renate Adrian, Klaus Hestermann, Gero Heymer
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Patent number: 4265776Abstract: The invention provides cleaning and detergent compositions which contain about 0.2 to 5 weight % of at least one compound of the general formula (I) ##STR1## in which R stands for a hydrogen atom or a methyl group and R.sub.1 stands for a hydrogen atom or an alkali metal or NH.sub.4 -ion.Type: GrantFiled: March 13, 1980Date of Patent: May 5, 1981Assignee: Hoechst AktiengesellschaftInventors: Werner Gohla, Klaus Hestermann, Joachim Kandler, Horst-Dieter Wasel-Nielen, Klaus Sommer, Hans-Adolf Rohlfs, Karl Merkenich
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Patent number: 4189449Abstract: Quaternary phosphonium hydroxides of the general formula: ##STR1## in which R stands either for hydrogen or an aliphatic or aromatic hydrocarbon having 1 to 12 carbon atoms and n stands for 1 or 2, are made by reacting a di- or trimethylphosphine in an aqueous medium with an epoxide of the general formula ##STR2## in which R has the meaning given above. More specifically a pH-value of .gtoreq.12 is established in the aqueous medium by means of a base and the starting materials are mixed in said medium.Type: GrantFiled: July 14, 1978Date of Patent: February 19, 1980Assignee: Hoechst AktiengesellschaftInventors: Klaus Hestermann, Hartfried Vollmer
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Patent number: 4156697Abstract: Alkyl phosphines of the general formula:R.sub.n PH.sub.3-n (I)are made. To this end hydrogen phosphide, a primary or a secondary phosphine is reacted with an alkylamine of the general formula:R.sub.n NH.sub.3-n (II)in a molar ratio of 0.1 to 10 mols of the alkylamine of formula II per mol of hydrogen phosphide or primary or secondary phosphine. The reaction is effected at a 150.degree. to 400.degree. C., at atmospheric pressure or a superatmospheric pressure up to 1 atmosphere gauge, and in contact with a catalyst comprising active carbon, copper (II) chromite, or one or more metals of Group Ib or VIII of the Periodic System of the elements. The starting materials are passed through a reaction zone at a rate which permits a contact time between them and the catalyst of 0.1 to 400 seconds.Type: GrantFiled: August 9, 1977Date of Patent: May 29, 1979Assignee: Hoechst AktiengesellschaftInventors: Klaus Hestermann, Hartfrid Vollmer, Gero Heymer, Ernst-Gunther Schlosser
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Patent number: 4150058Abstract: Alkyl phosphines are made. To this end, phosphorus in vapor form is reacted with steam and an alkyl amine at elevated temperature in contact with a carbon catalyst placed in a reactor, the reactants being used individually or in admixture with one another.Type: GrantFiled: May 8, 1978Date of Patent: April 17, 1979Assignee: Hoechst AktiengesellschaftInventors: Klaus Hestermann, Gero Heymer
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Patent number: 4136155Abstract: Phosphine (hydrogen phosphide) is made by reacting gaseous yellow phosphorus with steam at temperatures of 280 to 400.degree. C in the presence of ammonia in contact with a carbon catalyst.Type: GrantFiled: May 8, 1978Date of Patent: January 23, 1979Assignee: Hoechst AktiengesellschaftInventors: Klaus Hestermann, Gero Heymer
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Patent number: 4122123Abstract: Production of quaternary phosphonium halides of the general formula:[R.sup.1 R.sup.2 R.sup.3 R.sup.4 P]X,in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 stand for identical or different alkyl groups having from 1 to 4 carbon atoms and X stands for halogen, especially for chlorine or bromine. The compounds are more especially made by flowing hydrogen phosphide or a primary phosphine R.sup.1 PH.sub.2 or secondary phosphine R.sup.1 R.sup.2 PH or tertiary phosphine R.sup.1 R.sup.2 R.sup.3 P and an alkyl halide R.sup.4 X in a molar ratio from 0.02 to 10, at a temperature from 100.degree. to 500.degree. C, under a pressure of up to 10 atmospheres gauge and for a period from 0.5 to 500 seconds over a catalyst and separating the resulting quaternary phosphonium halides from the reaction gas.The halides so made are used for making trialkylphosphine oxides and trialkylphosphines.Type: GrantFiled: November 28, 1975Date of Patent: October 24, 1978Assignee: Hoechst AktiengesellschaftInventors: Klaus Hestermann, Horst Staendeke, Bernd Lippsmeier
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Patent number: 4118590Abstract: Production of novel phosphobetaines of general formula I ##STR1## in which R.sup.1 and R.sup.2 each stand for organic groups having from 1 to 18 carbon atoms, and R.sup.1 or R.sup.2 may be identical with the substituent R, the substituent R being a radical of the general formula II ##STR2## in which R.sup.3 and R.sup.4 each stand for organic groups having from 1 to 18 carbon atoms, and/or hydrogen atoms, and R.sup.5 stands for a linear or branched alkyl group having from 1 to 4 carbon atoms, which may optionally have a halogen or hydroxylic group substituent attached thereto.Type: GrantFiled: October 27, 1976Date of Patent: October 3, 1978Assignee: Hoechst AktiengesellschaftInventors: Hartfrid Vollmer, Klaus Hestermann
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Patent number: 4091012Abstract: Production of tertiary phosphine oxides which contain nitrile groups and correspond to the following general formula I: ##STR1## in which R.sup.1 and R.sub.2 each stand for a straight or branched, identical or different alkyl, cycloalkyl, aryl, alkylaryl or aralkyl group having 1 to 18 carbon atoms, and in which R.sup.1 or R.sub.2 may be identical with R, which stands for a radical of the following general formula II: ##STR2## in which R.sup.3 and R.sup.4 each stand for a straight or branched, identical or different alkyl, cycloalkyl, aryl, alkylaryl or aralkyl group having 1 to 18 carbon atoms, and/or hydrogen atoms. The tertiary phosphine oxides are made by reacting a phosphine of the following general formula III: ##STR3## in which R.sup.5 has the same meaning as R.sup.3 and R.sup.6 has the same meaning as R.sup.4 but is no hydrogen, with an .alpha.,.beta.-unsaturated nitrile of the following general formula IV: ##STR4## in which R.sup.3 and R.sup.4 have the meanings given above.Type: GrantFiled: March 24, 1977Date of Patent: May 23, 1978Assignee: Hoechst AktiengesellschaftInventors: Hartfrid Vollmer, Georg Elsner, Bernd Lippsmeier, Klaus Hestermann
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Patent number: 4091078Abstract: Phosphine is produced from elementary yellow phosphorus and an aqueous alkali metal hydroxide solution in the presence of an alcohol. The phosphine is more particularly made by using an alcohol having from 5 to 10 carbon atoms and a dissolving power for yellow phosphorus of more than 5 g/l; suspending the phosphorus with agitation in the said alcohol in a reaction zone; reacting the resulting suspension with the alkali metal hydroxide solution at temperatures lower than the boiling point of the alcohol; and collecting the resulting issuing gaseous phosphine.Type: GrantFiled: October 28, 1976Date of Patent: May 23, 1978Assignee: Hoechst AktiengesellschaftInventors: Klaus Hestermann, Jurgen Stengel, Gero Heymer, Christian May
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Patent number: 4080384Abstract: Production of (hydroxymethyl)-alkyl, cycloalkyl or aralkylphosphines of the general formula:R.sub.n P(CH.sub.2 OH).sub.3-nin which n stands for 1 or 2 and R stands for identical or different, substituted or unsubstituted alkyl, cycloalkyl or aralkyl radicals having from 1 to 18 carbon atoms. The compounds are made by reacting suitable mono- or di-alkyl, cycloalkyl or aralkylphosphines at atmospheric pressure and at temperatures lower than 40.degree. C with formaldehyde, paraformaldehyde or trioxane in the presence of polar organic solvents being inert with respect to the resulting reaction product, and separating the solvent from the reaction product.Type: GrantFiled: March 18, 1975Date of Patent: March 21, 1978Assignee: Hoechst AktiengesellschaftInventors: Bernd Lippsmeier, Klaus Hestermann, Gero Heymer
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Patent number: 4076755Abstract: Production of tertiary hydroxyalkylphosphine oxides of general formula (I) ##STR1## in which R.sup.1 and R.sup.2 each stand for organic groups having from 1 to 18 carbon atoms, where R.sup.1 may be identical with R.sup.2 and R.sup.2 may be identical with R which stands for a radical of general formula (II) ##STR2## in which R.sup.3 and R.sup.4 equally stand for organic groups having from 1 to 18 carbon atoms and/or more preferably for hydrogen. The compounds are made from phosphines of general formula (III) ##STR3## in which R.sup.3 and R.sup.4 have the meanings given above, which are reacted in a single step operation with carbonyl compounds of general formula (IV) ##STR4## in which R.sup.3 and R.sup.4 equally have the meanings given above. The reaction is effected while adding at least one substance yielding hydroxyl ions and in the presence of water, and the resulting hydroxyalkylphosphine oxides are separated from the reaction product.Type: GrantFiled: March 15, 1976Date of Patent: February 28, 1978Assignee: Hoechst AktiengesellschaftInventors: Bernd Lippsmeier, Klaus Hestermann
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Patent number: 4073810Abstract: Production of organophosphines of the general formula R.sub.n PH.sub.3-n, in which R stands for identical or different, substituted or unsubstituted alkyl, cycloalkyl or aralkyl groups having from 1 to 18 carbon atoms, preferably from 1 to 4 carbon atoms, more preferably from 1 to 2 carbon atoms, and n stands for a whole number within the range 1 and 3. The compounds are more particularly produced by continuously reacting hydrocarbon halides of the general formula RX, in which R has the meaning given hereinabove and X stands for halogen, especially for chlorine or bromine, with hydrogen phosphide, and primary or secondary organophosphines at temperatures within the range 100.degree. and 600.degree. C. and under pressures of up to 20 atmospheres in contact with a catalyst being placed in a reactor. Gaseous matter issuing from the reactor is cooled and the resulting organophosphonium halides (R.sub.n PH.sub.4-n)X are hydrolyzed in conventional manner to the corresponding organophosphines.Type: GrantFiled: February 12, 1975Date of Patent: February 14, 1978Assignee: Hoechst AktiengesellschaftInventors: Klaus Hestermann, Bernd Lippsmeier, Gero Heymer
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Patent number: 4028421Abstract: Production of tertiary (hydroxymethyl)-methylphosphine oxides of the general formula: ##STR1## in which R stands for a branched or unbranched, substituted or unsubstituted alkyl, cycloalkyl, aralkyl or aryl group having from 1 to 18 carbon atoms. To this end tertiary bis-(hydroxymethyl)-phosphines of the general formula ##STR2## in which R has the meaning given above, are subjected to a thermal rearrangement reaction at temperatures higher than about 90.degree. C or at temperatures within the range -10.degree. and +250.degree. C, in the presence of a catalyst.Type: GrantFiled: March 21, 1975Date of Patent: June 7, 1977Assignee: Hoechst AktiengesellschaftInventors: Bernd Lippsmeier, Klaus Hestermann, Martin Reuter
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Patent number: 4020110Abstract: Production of tertiary methylphosphine oxides of the general formula ##STR1## in which R and R' each stand for identical or different, branched or unbranched, substituted or unsubstituted alkyl, cycloalkyl, aralkyl or aryl groups having from 1 to 18 carbon atoms. The compounds are produced by subjecting tertiary hydroxymethylphosphines of the general formula ##STR2## in which R and R' have the meanings given above, to a thermal rearrangement reaction at temperatures higher than about 90.degree. C or, in the presence of a catalyst, at temperatures within the range -10 and +250.degree. C.Type: GrantFiled: March 20, 1975Date of Patent: April 26, 1977Assignee: Hoechst AktiengesellschaftInventors: Bernd Lippsmeier, Klaus Hestermann, Martin Reuter
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Patent number: 3998886Abstract: Production of halogen-containing tertiary phosphine oxides of the general formula (I) ##STR1## in which R.sub.1 stands for an alkyl, halogenoalkyl, alkenyl, halogenoalkenyl, alkinyl or halogenoalkinyl radical, each of these radicals containing from 1 to 18 carbon atoms, or stands for a cycloalkyl, a halogenated cycloalkyl, an aryl, a halogenated aryl, an aralkyl or a halogenated aralkyl radical, and X stands for halogen.The oxides are made by subjecting a compound of the general formula (II) ##STR2## in which R has the same meaning as R.sub.Type: GrantFiled: March 13, 1975Date of Patent: December 21, 1976Assignee: Hoechst AktiengesellschaftInventors: Bernd Lippsmeier, Klaus Hestermann, Hubert Neumaier
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Patent number: 3997611Abstract: Production of tertiary phosphine oxides of the general formula (I): ##STR1## in which the substituents R.sub.1 and R.sub.2, being identical or different, each stand for an alkyl, alkenyl, alkinyl, cycloalkyl, aralkyl or aryl radical having from 1 to 18 carbon atoms. The phosphine oxides are made by splitting off formaldehyde and hydrogen halide at temperatures within the range about 150.degree. and 350.degree. C, in the presence of hydrogen halide, from a molten compound of the general formula (II): ##STR2## in which R.sub.1 and R.sub.2 have the meanings given above and X stands for halogen; separating the formaldehyde and hydrogen split off from the reaction mixture, and treating the resulting crude product so as to separate the compound of general formula (I) therefrom.Type: GrantFiled: March 26, 1975Date of Patent: December 14, 1976Assignee: Hoechst AktiengesellschaftInventors: Bernd Lippsmeier, Klaus Hestermann, Hubert Neumaier
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Patent number: 3980711Abstract: Methylphosphine oxides of the general formula (I) ##EQU1## are produced from hydroxymethylphosphines of the general formula (II) ##EQU2## in which formulae R and R' each stand for identical or different alkyl-, cycloalkyl-, aralkyl- or aryl groups having from 1 to 18 carbon atoms, or carrying substituents being inert under the reaction conditions.The methylphosphine oxides are more particularly produced by subjecting the hydroxymethylphosphines to a rearrangement reaction with the aid of radical-yielding compounds.Type: GrantFiled: February 12, 1975Date of Patent: September 14, 1976Assignee: Hoechst AktiengesellschaftInventors: Bernd Lippsmeier, Klaus Hestermann, Gero Heymer