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| Number | Title | Issue Date |
| 7358215 | Quaternary ammonium salts as thickening agents for aqueous systems This invention relates to the use of alkyl amido quaternary ammonium salts, and formulations thereof, as thickening agents in aqueous based fluids, especially those used in oil field applications. The quaternary ammonium salts of the present invention exhibit improv... | 04/15/2008 |
| 7342136 | Process of making long chain internal fatty tertiary amines A process for preparing long chain internal fatty tertiary amines, quaternary amines and amine oxides via the selection of long chain internal olefins. ... | 03/11/2008 |
| 7198844 | Microporous polymeric resin containing stabilizers and method for making thereof Microporous particles for stabilizing thermoplastic compositions comprising comprising a stabilizer are provided. Each of the porous microparticles has a plurality of preformed pores into which the stabilizing agent is loaded and from which the stabilizing is subseq... | 04/03/2007 |
| 7129287 | Clay nanocomposites prepared by in-situ polymerization A method for preparing exfoliated clay nanocomposites by in-situ polymerization comprising the steps of (a) providing a mixture of at least one type of monomer and at least one type of organophilic clay; and (b) initiating an in-situ polymerization reaction in the m... | 10/31/2006 |
| 7094724 | Catalytic solid supported on calcined hydrotalcite for olefinic polymerisation Catalyst solid for olefin polymerization comprising A) at least one calcined hydrotalcite and B) at least one organic transition metal compound, and also a catalyst system comprising the catalyst solid, the use of the catalyst sol... | 08/22/2006 |
| 7033989 | High-concentration aqueous solutions of betaines or amine oxides The present invention relates to a composition and a method for preparing high-concentration aqueous solutions of betaines or amine oxides which comprise a water-soluble carbohydrate. The high-concentration aqueous solutions of the present invention are pumpable, vi... | 04/25/2006 |
| 7030257 | Metallocenes and processes for their preparation Disclosed herein are novel high oxidation state metallocene compounds, processes for preparing these compounds and uses of these compounds. ... | 04/18/2006 |
| 6706923 | Perfluoroalkyl-substituted amines, acids, amino acids and thioether acids Perfluoroalkyl-substituted amines, acids, amino acids and thioether acid compounds containing a perfluoroalkyl-iodoalkyl or perfluoroalkyl-alkene group as well as derivatives thereof, are described. They are useful as surfactants in a variety of applications where l... | 03/16/2004 |
| 6689911 | Process An integrated process for preparing -(2,4-disulfophenyl)-N-tert-butylnitrone and its salts is disclosed in which N-tert-butylhydroxylamine acid addition salt is incompletely neutralised so as to leave catalytic amounts of acid and the neutrali... | 02/10/2004 |
| 6579461 | Method for preparing or purifying aqueous solutions of a tertiary amino-oxide The invention relates to a process for the reprocessing respectively purification of aqueous solutions of a tertiary amine oxide, particularly of process waters, e.g. used precipitation baths, which occur during the production of cellulosic moulded bodies... | 06/17/2003 |
| 6538141 | Method for preparing nitroxides The invention concerns a method for preparing nitroxides, which consists in oxidising, in a two-phase medium, using an aliphatic peroxide, secondary amines with steric hindrance or having a --CH in the nitrogen atom .... | 03/25/2003 |
| 6455735 | Process for the preparation of amine oxides The present invention provides a process for the preparation of high quality amine oxide by reacting a tertiary or secondary amine with hydrogen peroxide as an oxidant in presence of a recyclable heterogeneous layered double hydroxide exchanged with one o... | 09/24/2002 |
| 6323367 | Process for the preparation of amine oxides A process for the preparation of high quality amine oxides by reacting a tertiary or secondary amine with hydrogen peroxide as an oxidant in the presence of a recyclable heterogeneous layered double hydroxide exchanged with one of the anions of transition... | 11/27/2001 |
| 6294514 | Process for preparing mono-long chain amine oxide surfactants with low nitrite, nitrosamine and low residual peroxide Mono-long chain amine oxide surfactants can be prepared containing active levels of greater than about 30%, by weight of amine, and with low nitrite and nitrosamine levels and low levels of residual hydrogen peroxide when oxidized under controlled tempera... | 09/25/2001 |
| 6291702 | Azulenyl nitrone spin trapping agents, methods of making and using same The present invention relates to chromotropic nitrone spin trapping agents, methods of making these agents, compositions comprising same, and methods of their use. In particular, azulenyl nitrones of the present invention are effective agents for trapping... | 09/18/2001 |
| 6281176 | Process for producing betaine/amine oxide mixtures This invention provides a process for producing a betaine/amine oxide mixture. This process comprises reacting, in a liquid medium, an alkali metal ω-halocarboxylate with a first tertiary amine of the formula Ra2 Rb N, wh... | 08/28/2001 |
| 6197825 | Azulenyl nitrone spin trapping agents, methods of making and using same The present invention relates to chromotropic nitrone spin trapping agents, methods of making these agents, compositions comprising same, and methods of their use. In particular, azulenyl nitrones of the present invention are effective agents for trapping... | 03/06/2001 |
| 6166255 | Production of tertiary amine oxides Exothermic oxidation of tertiary amine with aqueous hydrogen peroxide in an aqueous reaction medium formed or being formed from tertiary amine, aqueous hydrogen peroxide, carbon dioxide, and optionally chelating agent and/or additional water, is initiated... | 12/26/2000 |
| 6121490 | Production of solid tertiary amine oxides A process for producing tertiary amine oxide having two methyl or ethyl groups and one long chain primary aliphatic group in a stable, solid form is described. Aqueous 65-90% hydrogen peroxide and tertiary amine having two methyl or ethyl groups and one p... | 09/19/2000 |
| 6080889 | Production of tertiary amine oxides Exothermic oxidation of tertiary amine with aqueous hydrogen peroxide in an aqueous reaction medium formed or being formed from tertiary amine, aqueous hydrogen peroxide, carbon dioxide, and optionally chelating agent and/or additional water, is initiated... | 06/27/2000 |
| 6054616 | Process for reducing residual raw material impurities in tertiary amine oxides The claimed process consists in treating the tertiary amine oxide with a sulphite or a bleach activator.... | 04/25/2000 |
| 6037497 | Process for producing amine oxides A process is described in which tertiary amine is oxidized with hydrogen peroxide in the presence of carbon dioxide until the reaction mass contains (i) about 0.5 to about 6.5%, and preferably about 1 to about 2.5%, of unreacted free amine, (ii) carbon di... | 03/14/2000 |
| 5955633 | Synthesis of tertiary amine oxides A process is provided for the manufacture of free-flowing solid tertiary amine oxides having N-nitrosodimethylamine levels of less than about 250 ppb. The process comprises heating a mixture of a tertiary amine, a polar hydroxy alkyl solvent, an organic a... | 09/21/1999 |
| 5892117 | Preparation and uses of N-methylnitrone Oxidation of secondary amines with hydrogen peroxide and sodium tungstate is reported to give good yields of nitrones. However, when using dimethylamine in this manner, a considerable amount of N,N-dimethylformamide was produced as a co-product. To more s... | 04/06/1999 |
| 5866718 | Synthesis of tertiary amine oxides A process is provided for the manufacture of free-flowing solid tertiary amine oxides having N-nitrosodimethylamine levels of less than about 250 ppb. The process comprises heating a mixture of a tertiary amine, a polar hydroxy alkyl solvent, an organic a... | 02/02/1999 |
| 5773655 | Process for the purification of an aqueous solution of a tertiary amine-oxide The invention is concerned with a process for the purification of an aqueous solution of a tertiary amine-oxide containing impurities partially present in a dissolved and partially in a non-dissolved, colloidal state, and is characterized by a combination... | 06/30/1998 |
| 5710332 | Carbohydrate-derived surfactants and their precursors A method for the manufacture of N,N dialkylglycamine compounds of general formula R2 NR1 R3 (I) by reacting a secondary amine of general formula R2 NHR3 (II) in which R2 is a straight or br... | 01/20/1998 |
| 5710333 | Process for the preparation of tertiary amine oxides Process for the preparation of tertiary amine oxides by reaction of a tertiary amine with a compound which splits off oxygen. To avoid gel and foam formation, a portion of the amine oxide to be prepared is added before the start of this reaction.... | 01/20/1998 |
| 5693861 | Process for preparing solid amine oxides A highly pure, white, solid amine oxide is prepared in high yield with minimal decomposition of the solvent by (A) reacting a tert-amine with a 15-20% stoichiometric excess of concentrated hydrogen peroxide at 50°-55° C. in the presence of controlled am... | 12/02/1997 |
| 5668281 | Process for preparing tertiary amine-N-oxide A process for preparing a tertiary amine-N-oxide which comprises reacting a tertiary amine with a peroxide in the presence of a catalyst comprising an oxide containing silicon and titanium atoms. According to the process of the present invention, a tertia... | 09/16/1997 |
| 5639880 | Preparation of amine oxides A process for preparing amine oxides of the general formula I ##STR1## where R1, R2 and R3 are each C1 -C30 -alkyl, C3 -C12 -cycloalkyl, C1 -C30 -hydroxyalk... | 06/17/1997 |
| 5628941 | Process for the production of cellulose moulded bodies The invention is concerned with a process for the production of cellulose moulded bodies. In this process, cellulose is first dissolved in an aqueous solution of a tertiary amine-oxide, in particular N-methylmorpholine-N-oxide (NMMO), to produce a mouldab... | 05/13/1997 |
| 5621118 | Oxidation process A process for oxidizing a substrate susceptible to nucleophilic oxidation by reacting a bicaroate or monopersulfate solution with the substrate is disclosed. In one aspect, the substrate is introduced into the reaction mixture in an inert carrier gas, whi... | 04/15/1997 |
| 5583258 | Process for preparing mono-long chain amine oxide surfactants Mono-long chain amine oxide surfactants can be prepared containing active levels of greater than about 30%, by weight of amine, and with low nitrite and nitrosamine levels when oxidized in the presence of bicarbonate material present at levels less than a... | 12/10/1996 |
| 5578744 | Catalytically active gel and a process for its preparation A catalytically active gel is described consisting of a silica matrix with uniform porosity, monomodal pore distribution and high surface area, within which one or metal oxides possessing catalytic activity are dispersed. A process for preparing this cata... | 11/26/1996 |
| 5543515 | Preparation of tertiary amine oxides A process for preparing tertiary amine oxides with a low nitrosamine content by reacting a tertiary amine with an aqueous solution of hydrogen peroxide, which comprises using as starting material tertiary amines whose total content of primary and secondar... | 08/06/1996 |
| 5498791 | Nitrosamine and nitrite inhibition A synergistic mixture of a carbonate and/or bicarbonate with a phosphonate, especially an organoamino methylene phosphonate or an N-oxide thereof, inhibits or reduces nitrosamine contamination during preparation, storage and/or heating of products which a... | 03/12/1996 |
| 5498373 | Process for reducing the levels of nitrite contaminants in amine oxide surfactants Amine oxide surfactants contaminated with nitrite are treated under acidic conditions with materials such as maleic acid and diethylenetriaminepentaacetate (DTPA) to reduce nitrite levels below 1 ppm. Thus, C12-13 dimethyl amine is oxidized wit... | 03/12/1996 |
| 5466870 | Process for reducing the levels of nitrite contaminants in amine oxide surfactants Amine oxide surfactants contaminated with nitrite are treated under acidic conditions with materials such as maleic acid and diethylenetriaminepentaacetate (DTPA) to reduce nitrite levels below 1 ppm. Thus, C12-13 dimethyl amine is oxidized wit... | 11/14/1995 |
| 5442113 | Nitrosamine and nitrite inhibition A synergistic mixture of a carbonate and/or bicarbonate with a phosphonate, especially an organoamino methylene phosphonate or an N-oxide thereof, inhibits or reduces nitrosamine contamination during preparation, storage and/or heating of products which a... | 08/15/1995 |
