WO2006005692A1 - Composition comprising choline hydroxide and process for preparing the same - Google Patents
Composition comprising choline hydroxide and process for preparing the same Download PDFInfo
- Publication number
- WO2006005692A1 WO2006005692A1 PCT/EP2005/053160 EP2005053160W WO2006005692A1 WO 2006005692 A1 WO2006005692 A1 WO 2006005692A1 EP 2005053160 W EP2005053160 W EP 2005053160W WO 2006005692 A1 WO2006005692 A1 WO 2006005692A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- choline
- sulfite
- stabilizer
- composition
- solution
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/005—Stabilisers against oxidation, heat, light, ozone
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C215/00—Compounds containing amino and hydroxy groups bound to the same carbon skeleton
- C07C215/02—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton
- C07C215/40—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton with quaternised nitrogen atoms bound to carbon atoms of the carbon skeleton
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/55—Boron-containing compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/07—Nitrogen-containing compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/11—Halides
Definitions
- the present invention relates to a composition comprising choline hydroxide, a stabilizer, and a solvent, to a process to prepare the composition, and to the use thereof.
- Choline hydroxide also known as choline base or (2-hydroxyethyl) trimethyl- ammonium hydroxide, is a well-known organic base suitable for many uses.
- compositions of choline hydroxide are subject to a gradual decomposition process.
- the main reason for this decomposition is thought to be the tendency of choline base to attack itself, as a result of which the products of this decomposition are reacted further.
- the underlying chemistry of this degradation is quite complex and not fully understood yet, but it results in choline base solutions turning brown to black during longer storage and developing precipitates.
- US 4,294,911 discloses the addition of a stabilizing concentration of a sulfite to an aqueous choline hydroxide composition.
- Sulfite is normally added as the inexpensive and readily available sodium sulfite salt.
- a disadvantage of using sodium sulfite is that concentrated choline base solutions still darken in a relatively short period of time, which is believed to be due to a low solubility of the sodium sulfite in concentrated choline base solutions. For example, in a 45 wt% aqueous choline base solution less than 0.5 wt% sodium sulfite is soluble. More soluble sulfites exist, but these are much more expensive and/or not readily available.
- US 4,686,002 discloses the addition of a stabilizing concentration of formaldehyde to an aqueous choline hydroxide composition. Formaldehydes are banned from many applications due to environmental issues.
- the object of the present invention is to provide a stabilized composition of choline hydroxide free of the above drawbacks.
- composition comprising choline hydroxide, a solvent, and one or more stabilizers selected from the group consisting of a hydride and choline sulfite.
- the stabilizer used in the composition of the present invention causes the composition to retain its white colour for a longer period of time compared to sodium sulfite.
- the stabilizers of the present invention further have the advantage that they generally introduce less salt into the composition; a lower amount of the hydride is generally required to prevent darkening of the composition as compared to conventional compositions comprising sodium sulfite salt, and choline sulfite does not introduce any salt into the composition.
- the solvent is water or an alcohol, more preferred is water or methanol, most preferred is water. However, also a mixture of these solvents can be used.
- the invention relates to a composition comprising choline hydroxide and a borohydride compound wherein the amount of borohydride compound is smaller than the amount of choline hydroxide on a weight basis.
- composition according to the invention comprises 10 to 60 wt% choline hydroxide, based on the total weight of the composition. In a more preferred embodiment the composition comprises 20 to 55 wt% choline hydroxide, based on the total weight of the composition, and in a most preferred embodiment it comprises 30 to 50 wt%.
- the composition according to the invention comprises a hydride as stabilizer in an amount of 1 ppm to 1,000 ppm, preferably 10 ppm to 500 ppm, and most preferably 50 ppm to 200 ppm.
- the stabilizer is choline sulfite
- the composition according to the invention comprises 0.1 to 19 wt%, based on the total weight of the composition, preferably 0.2 to 5 wt%, and most preferably 0.5 to 1 wt% of choline sulfite.
- compositions comprising these amounts of stabilizer reveal a higher colour stability than conventional choline base compositions containing sodium sulfite as stabilizer.
- the present invention further pertains to a masterbatch comprising 10 to 60 wt% of choline hydroxide, 5 to 20 wt% of one or more stabilizers selected from the group consisting of a hydride and choline sulfite, with the remaining part being solvent, based on the total weight of choline hydroxide, stabilizer, and solvent.
- a masterbatch which typically comprises a large quantity of stabilizer, can be added to a choline hydroxide solution in the desired amount in order to stabilize the solution.
- Such masterbatches preferably comprise 8 to 15 wt% of stabilizer and most preferably between 10 and 12 wt%, based on the total weight of the masterbatch.
- the stabilizer of the present invention is selected from the group consisting of hydrides and choline sulfite.
- the hydride generally is a strong reducing agent and can be any hydride known to the man skilled in the art. Suitable examples of hydrides are lithium hydrides, aluminium hydrides, and borohydrides. The preferred hydrides are borohydrides.
- borohydride refers to any compound, or mixture of compounds, comprising a molecule of boron and hydrogen, also known as hydroborons, with the formula B x Hy, x and y being integers >0, such as B 2 H 6 (boroethane), B4H10 (borobutane), B 5 Hg, and B1 0 H14 (borodecane), and anions derived therefrom such as BH 4 " .
- Gaseous borohydrides are less preferred, as they are difficult to handle and may impose safety risks.
- Preferred borohydrides comprise one or more anions derived from borohydride.
- the preferred borohydride is a BH 4 " salt and particularly preferred are alkali metal borohydride salts.
- a preferred alkali metal borohydride salt because of its commercial availability and the fact that it is relatively safe to make, handle, and use is sodium borohydride (NaBH 4 ).
- the composition comprises a hydride, and in particular a borohydride compound, which is fixed to a polymer carrier.
- a borohydride compound which is fixed to a polymer carrier.
- the use of such a (boro)hydride compound has the advantage that the (boro)hydride stabilizer may be easily removed from the choline base solution when desired, for example when the choline base solution is used in an application where the (boro)hydride or the inorganic counterion has a detrimental effect.
- the composition comprises one or more additional stabilizing compounds.
- additional stabilizing compounds include sulfites, formaldehyde, hydroxylamines, derivatives and mixtures thereof.
- the second stabilizing compound is a sulfite or a sulfite derivative.
- Sulfite derivatives include for example dithionites.
- the sulfite is sodium sulfite.
- two or more additional stabilizing compounds are used.
- the stabilizer and in particular of the borohydrides, are their reducing power and their compatibility with the choline base production process. Because of their reducing power the choline base solution is clear and paper white.
- the hydrides, and in particular the borohydride compounds can even be added to a choline base mixture that is already yellowed and still provide a clear and white solution.
- stabilizers of the invention are stable under strongly alkaline conditions. This means that the concentration of the stabilizer in choline base can be increased to amounts sufficiently high to combine the desired properties of both choline hydroxide and stabilizer. This is particularly advantageous when borohydrides are used as stabilizer.
- the process further pertains to a process for preparing the composition according to any one of claims 1-5 by combining one or more stabilizers selected from the group consisting of a hydride and choline sulfite with a choline hydroxide solution.
- the current invention also relates to a process for preparing the composition of the invention comprising the steps of reacting ethylene oxide with trimethylamine in the presence of one or more stabilizers selected from the group consisting of a hydride and choline sulfite, said stabilizer being added to the ethylene oxide, the trimethyl amine and/or the reaction mixture.
- This process for preparing choline base is generally carried out by reacting ethylene oxide with trimethyl amine in an inert atmosphere at a temperature of 0 to 70 0 C.
- choline sulfite is used as the stabilizer, it is also envisaged to prepare the choline sulfite in situ by subjecting the choline hydroxide solution produced by reacting ethylene oxide and trimethyl amine to sulfur dioxide.
- the resulting amount of choline sulfite in the chlorine hydroxide solution will depend on the period of time the choline hydroxide solution is subjected to the sulfur dioxide.
- the resulting amount of choline sulfite can be set as desired.
- the stabilizer in particular a borohydride
- the stabilizer is used in an amount such that 1-1,000 ppm, preferably 10-500 ppm, more preferably 50-200 ppm of borohydride is present on the total weight of the final product solution.
- the stabilizer is used in an amount such that 5 to 20 wt%, preferably 8-15 wt%, and most preferably 10-12 wt% is present on the total weight of the final product solution.
- the choline base is prepared at a temperature between 10 and 5O 0 C and an inert atmosphere is created by flushing the reactor and the solution with an inert gas, while a safety pressure of the inert gas - normally nitrogen - is maintained during the reaction step.
- the. .temperature is between 15 and 45°C, most preferred is a temperature of about room temperature.
- compositions according to the present invention are suitable for many applications. As already indicated above, as the amount of stabilizer in a choline base can be relatively high, the compositions can also be used in applications where the stabilizer is active as well. In this respect, the stabilizers of the invention, and in particular borohydride, are particularly suitable for use in the production and bleaching of paper.
- a method to bleach paper pulp is also covered by the present application.
- paper pulp is contacted with the compositions according to the present invention.
- Aqueous compositions comprising a borohydride salt are known for bleaching paper and are disclosed, e.g., in WO 88/10334.
- aqueous compositions comprising choline hydroxide and a borohydride salt for bleaching paper are not disclosed for this use.
- borohydride solutions known to be used in applications where borohydride is active often are solutions of borohydride in caustic, which often makes them less suitable for applications that are not compatible with a caustic solution, such as the production of paper.
- a solution of choline base in water is prepared in a 1 -litre pressure autoclave by reacting 116 g of ethylene oxide with a solution of 150 g of trimethylamine in 417 g of water. By using a cooling jacket the temperature during the reaction is kept between 15 and 45 0 C. Before starting the reactor is flushed with nitrogen and a safety pressure of 2-3 bar nitrogen is maintained during the ethoxylation step.,. The resulting solution of 45 wt% of choline base in water is used in Examples 1 - 3 below.
- a solution of choline sulfite is prepared by adding gaseous sulfur dioxide in a stoichiometric amount to the 45 wt% aqueous choline base solution of Prep.
- Example A The resulting 53 wt% solution of choline sulfite is used in Examples 1 , 2, 5, and 6 below.
- a solution of sodium borohydride in choline base is prepared by adding solid sodium borohydride to a 45 wt% aqueous choline base solution of Prep. Example A until a concentration of 12 wt% borohydride is reached. The resulting aqueous composition is used in Preparation Example D below.
- a solution of choline base in water is made in a 1 -litre pressure autoclave by reacting 116 g ethylene oxide and 15O g of trimethylamine in 417 g of water. By using a cooling jacket the temperature during the reaction is kept between 15 and 45 0 C. Before starting the reactor is flushed with nitrogen and a safety pressure of 2-3 bar of nitrogen is maintained during the ethoxylation step. Before starting the reaction 0.85g of the borohydride solution described in Example C is added. The resulting aqueous composition is used in Examples 4 and 5 below.
- Example A Two samples of 110 g of the choline base solution of Prep.
- Example A were drawn into 100 ml sample bottles under flushing with nitrogen. Choline sulfite solution of preparation example B was added till the total concentration of choline sulfite in the sample was 0.2 wt%.
- the sample bottles were closed and stored under ambient conditions. After 4 months the solutions were slightly yellow but still clear (i.e. free of precipitates).
- Example A Two samples of 110 g of the choline base solution of Prep.
- Example A were drawn into 100 ml sample bottles under flushing with nitrogen.
- Choline sulfite solution of preparation Example B was added till the total concentration of choline sulfite in the sample was 0.4 wt%.
- the sample bottles were closed and stored under ambient conditions. After 4 months the solutions were slightly yellow but still clear. Comparative Example 3
- Example A Two samples of 110 g of the choline base solution of Prep. Example A were drawn into 100 ml sample bottles under flushing with nitrogen. Paraformaldehyde was added till the total concentration of paraformaldehyde in the sample was 0.4 wt%. The sample bottles were closed and stored under ambient conditions. After 4 months the solutions were darkened and a layer of brown precipitates had formed on the bottom of the sample bottles
- Example D Two samples of 110 g of the choline base solution of Prep. Example D were drawn into 100 ml sample bottles under flushing with nitrogen. The sample bottles were closed and stored under ambient conditions. After 4 months the solutions were still clear and paper white.
- Example D Two samples of 110 g of the choline base solution of Prep. Example D were drawn into 100 ml sample bottles under flushing with nitrogen. Choline sulfite solution of preparation Example B was added till the total concentration of choline sulfite in both samples was 0.4 wt%. The sample bottles were closed and stored under ambient conditions. After 4 months the solutions were still clear and paper white.
- Example D Two samples of 110 g of the choline base solution of Prep. Example D were drawn into 100 ml sample bottles under flushing with nitrogen. Choline sulfite solution of preparation Example B was added till the total concentration of choline sulfite in both samples was 2.6 wt%. The sample bottles were closed and stored under ambient conditions. After 4 months the solutions were still clear and paper white.
- Example D Two samples of 110 g of the choline base solution of Prep. Example D were drawn into 100 ml sample bottles under flushing with nitrogen. Sodium sulfite was added till the total concentration of sodium sulfite in both samples was 0.5 wt%. The sample bottles were closed and stored under ambient conditions. After 4 months the solutions were still clear and paper white, but a white layer of unsolved sodium sulfite had formed on the bottom of the sample bottle.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05758588A EP1781594A1 (en) | 2004-07-09 | 2005-07-04 | Composition comprising choline hydroxide and process for preparing the same |
MX2007000298A MX2007000298A (en) | 2004-07-09 | 2005-07-04 | Composition comprising choline hydroxide and process for preparing the same. |
CA002573213A CA2573213A1 (en) | 2004-07-09 | 2005-07-04 | Composition comprising choline hydroxide and process for preparing the same |
JP2007519783A JP2008505867A (en) | 2004-07-09 | 2005-07-04 | Composition comprising choline hydroxide and method for producing the same |
US11/632,088 US20070193708A1 (en) | 2004-07-09 | 2005-07-04 | Composition Comprising Choline Hydroxide And Process For Preparing The same |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04076991.1 | 2004-07-09 | ||
EP04076991 | 2004-07-09 | ||
US60735004P | 2004-09-07 | 2004-09-07 | |
US60/607,350 | 2004-09-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006005692A1 true WO2006005692A1 (en) | 2006-01-19 |
Family
ID=34928350
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/053160 WO2006005692A1 (en) | 2004-07-09 | 2005-07-04 | Composition comprising choline hydroxide and process for preparing the same |
Country Status (8)
Country | Link |
---|---|
US (1) | US20070193708A1 (en) |
EP (1) | EP1781594A1 (en) |
JP (1) | JP2008505867A (en) |
CN (1) | CN1984875A (en) |
CA (1) | CA2573213A1 (en) |
MX (1) | MX2007000298A (en) |
RU (1) | RU2007104939A (en) |
WO (1) | WO2006005692A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013076190A1 (en) * | 2011-11-22 | 2013-05-30 | Taminco | Stabilized choline solutions and methods for preparing the same |
US9527799B2 (en) | 2013-04-11 | 2016-12-27 | Taminco | Process for choline hydroxide |
US10920141B2 (en) | 2013-06-06 | 2021-02-16 | Entegris, Inc. | Compositions and methods for selectively etching titanium nitride |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140329184A1 (en) * | 2011-11-22 | 2014-11-06 | Taminco | Stabilized choline solutions and methods for preparing the same |
JP5897148B2 (en) * | 2011-12-29 | 2016-03-30 | タミンコ | Method for producing choline hydroxide |
IN2014DN05702A (en) * | 2012-01-19 | 2015-04-10 | Dow Agrosciences Llc | |
CN103874679A (en) | 2012-04-13 | 2014-06-18 | 亨斯迈石油化学有限责任公司 | Using novel amines to stabilize quaternary trialkylalkanolamines |
US11643384B2 (en) | 2018-04-26 | 2023-05-09 | Kurita Water Industries Ltd. | Stabilization of compositions comprising quaternary trialkylalkanolamine hydroxide |
CN109748808B (en) * | 2018-12-26 | 2021-12-24 | 济南蓬勃生物技术有限公司 | Preparation method of choline bicarbonate and carbonate |
CN109503395B (en) * | 2018-12-26 | 2021-11-16 | 济南蓬勃生物技术有限公司 | Stable choline solution and preparation method thereof |
CN113548973A (en) * | 2021-07-28 | 2021-10-26 | 上海德迈世欧化工有限公司 | Preparation method of electronic-grade choline hydroxide solution |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3855282A (en) * | 1971-07-26 | 1974-12-17 | Mundipharma Ag | Stabilized choline salicylate compounds |
GB1408772A (en) * | 1971-10-06 | 1975-10-08 | Weyerhaeuser Co | Electrostatographic copy sheet methods of making and using the same and electroconductive layers and coating compositions for use in same |
GB2153373A (en) * | 1984-01-30 | 1985-08-21 | Procter & Gamble | Process for minimizing color formation during base catalyzed ethoxylation of 2- hydroxyethylamines |
EP0253675A1 (en) * | 1986-07-18 | 1988-01-20 | Syntex (U.S.A.) Inc. | Stabilized choline base solutions |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4294911A (en) * | 1979-06-18 | 1981-10-13 | Eastman Kodak Company | Development of light-sensitive quinone diazide compositions using sulfite stabilizer |
DE69608669T2 (en) * | 1995-12-19 | 2001-03-01 | Fsi International Chaska | APPLICATION OF METAL FILMS WITH SPRAY PROCESSOR |
US20030211618A1 (en) * | 2001-05-07 | 2003-11-13 | Patel Gordhandhai Nathalal | Color changing steam sterilization indicator |
-
2005
- 2005-07-04 EP EP05758588A patent/EP1781594A1/en not_active Withdrawn
- 2005-07-04 JP JP2007519783A patent/JP2008505867A/en active Pending
- 2005-07-04 RU RU2007104939/04A patent/RU2007104939A/en not_active Application Discontinuation
- 2005-07-04 WO PCT/EP2005/053160 patent/WO2006005692A1/en active Application Filing
- 2005-07-04 CN CNA2005800231541A patent/CN1984875A/en active Pending
- 2005-07-04 CA CA002573213A patent/CA2573213A1/en not_active Abandoned
- 2005-07-04 MX MX2007000298A patent/MX2007000298A/en unknown
- 2005-07-04 US US11/632,088 patent/US20070193708A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3855282A (en) * | 1971-07-26 | 1974-12-17 | Mundipharma Ag | Stabilized choline salicylate compounds |
GB1408772A (en) * | 1971-10-06 | 1975-10-08 | Weyerhaeuser Co | Electrostatographic copy sheet methods of making and using the same and electroconductive layers and coating compositions for use in same |
GB2153373A (en) * | 1984-01-30 | 1985-08-21 | Procter & Gamble | Process for minimizing color formation during base catalyzed ethoxylation of 2- hydroxyethylamines |
EP0253675A1 (en) * | 1986-07-18 | 1988-01-20 | Syntex (U.S.A.) Inc. | Stabilized choline base solutions |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013076190A1 (en) * | 2011-11-22 | 2013-05-30 | Taminco | Stabilized choline solutions and methods for preparing the same |
WO2013077855A1 (en) * | 2011-11-22 | 2013-05-30 | Taminco N.V. | Stabilized choline solutions and methods for preparing the same |
US9527799B2 (en) | 2013-04-11 | 2016-12-27 | Taminco | Process for choline hydroxide |
US10920141B2 (en) | 2013-06-06 | 2021-02-16 | Entegris, Inc. | Compositions and methods for selectively etching titanium nitride |
Also Published As
Publication number | Publication date |
---|---|
EP1781594A1 (en) | 2007-05-09 |
CA2573213A1 (en) | 2006-01-19 |
RU2007104939A (en) | 2008-08-20 |
US20070193708A1 (en) | 2007-08-23 |
MX2007000298A (en) | 2007-04-02 |
CN1984875A (en) | 2007-06-20 |
JP2008505867A (en) | 2008-02-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20070193708A1 (en) | Composition Comprising Choline Hydroxide And Process For Preparing The same | |
KR101563247B1 (en) | Method for producing lithium tetrafluoroborate solution | |
EP2782899B1 (en) | Stabilized choline solutions and methods for preparing the same | |
AU2014253067C1 (en) | Improved process for preparing choline hydroxide | |
CA2485228A1 (en) | Process for the preparation of concentrated solutions of stabilized hypobromites | |
CA2465198C (en) | Process for the fluorination of boron hydrides | |
KR20070031397A (en) | Composition comprising choline hydroxide and process for preparing the same | |
US9079829B2 (en) | Method of preparing powder of a solid carbazic acid derivative | |
US20050025697A1 (en) | Precesses and compositions for direct catalytic hydrogen peroxide production | |
JPWO2017022063A1 (en) | Method for cleaving azine and hydrazone bonds | |
CN104557770A (en) | Method for synthesizing rubber vulcanization accelerator NS by taking sodium hypochlorite as oxidant | |
US20140329184A1 (en) | Stabilized choline solutions and methods for preparing the same | |
JP6180718B2 (en) | Method for producing lithium iodide aqueous solution and use thereof | |
KR20200135212A (en) | Method for preparing perovskite organic-inorganic hybrid materials using solid amines | |
EP2984068B1 (en) | Improved process for preparing choline hydroxide | |
CN101948417A (en) | Preparation method of rubber vulcanization accelerator tetra(isobutyl)thioperoxydicarbamic acid (TiBTD) | |
US20200317603A1 (en) | Process for stabilization of at least monoalkyl-substituted diaminocyclohexanes | |
CN109503395A (en) | A kind of stable choline solution and preparation method thereof | |
WO2022089774A8 (en) | Process for preparing 1,2-benzisothiazoline-3-one | |
JPH06329601A (en) | Stabilization of 4-nitrosodiphenylamine hydrochloride solution |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DPEN | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed from 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005758588 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007519783 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: MX/a/2007/000298 Country of ref document: MX Ref document number: 2573213 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200580023154.1 Country of ref document: CN |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020077000932 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 435/KOLNP/2007 Country of ref document: IN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007104939 Country of ref document: RU |
|
WWP | Wipo information: published in national office |
Ref document number: 1020077000932 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11632088 Country of ref document: US Ref document number: 2007193708 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 2005758588 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11632088 Country of ref document: US |