EP1941016A1 - Method for producing granular or powdery detergent compositions - Google Patents
Method for producing granular or powdery detergent compositionsInfo
- Publication number
- EP1941016A1 EP1941016A1 EP06793896A EP06793896A EP1941016A1 EP 1941016 A1 EP1941016 A1 EP 1941016A1 EP 06793896 A EP06793896 A EP 06793896A EP 06793896 A EP06793896 A EP 06793896A EP 1941016 A1 EP1941016 A1 EP 1941016A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- copolymer
- acid
- monomer
- group
- detergent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D11/00—Special methods for preparing compositions containing mixtures of detergents ; Methods for using cleaning compositions
- C11D11/0082—Special methods for preparing compositions containing mixtures of detergents ; Methods for using cleaning compositions one or more of the detergent ingredients being in a liquefied state, e.g. slurry, paste or melt, and the process resulting in solid detergent particles such as granules, powders or beads
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3757—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions
- C11D3/3761—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions in solid compositions
Definitions
- the present invention relates to a process for the preparation of granular or powdered detergent compositions comprising the preparation of a detergent base powder by drying an aqueous detergent slurries, as well as detergent slurries and detergent compositions containing a by radi kaiische Copolymerisation of
- liquid or solid components In the production of powder detergents or base powders for further processing into solid detergents (eg extrusion with addition of further components to granules), up to 30 liquid or solid components must be homogenized in intensively and uniformly homogeneous amounts, sometimes in very different amounts, which is achieved by slurrying in water ,
- various components e.g. Surfactants and zeolites used as builders, highly viscous mixtures. Since highly concentrated slurries are desired for the subsequent spray drying, it is necessary to use auxiliaries which lower the viscosity of the slurries.
- WO-A-91/09932 describes a process for producing granular detergent compositions in which a deflocculant polymer having a hydrophilic polymer main chain and hydrophobic side chains is added to the detergent slurry.
- the backbone is based on unsaturated monocarboxylic acids, dicarboxylic acids and / or alcohols as monomer units.
- the side chains which may contain polyalkylene oxide blocks, are attached to the backbone via ester, ether or amide functions. In the examples, a copolymer of acrylic acid and maleic acid ester cylester is used.
- Copolymers of acrylic acid and ethoxylated allyl ethers having an average molecular weight Mw of about 12,000 g / mol are used for this purpose in US Pat. Nos. 5,595,968, 5,618,782 and 5,733,861.
- WO-A-96/17919 describes copolymers of acrylic acid and maleic acid containing dodecylmercaptan groups as end groups as deflocculants for detergent slurries.
- the copolymers used according to the invention contain as copolymerized monomer (A) a monoethylenically unsaturated monocarboxylic acid or dicarboxylic acid or a mixture of these acids.
- the acids can be used in the form of their water-soluble salts, in particular the alkali metal salts, such as potassium and especially sodium salts, or ammonium salts, the dicarboxylic acids can also be wholly or partially in anhydride form. Of course, acid mixtures can also be used.
- the monomers (A) preferably contain 3 to 10 carbon atoms.
- suitable monomers (A) are: acrylic acid, methacrylic acid, crotonic acid, vinylacetic acid, maleic acid, maleic anhydride, fumaric acid, citraconic acid, citraconic anhydride and itaconic acid.
- Particularly preferred monomers (A) are acrylic acid, methacrylic acid and maleic acid (anhydride), with maleic acid (anhydride) being very particularly preferred.
- the copolymers used according to the invention contain from 20 to 80% by weight, in particular from 30 to 70% by weight, of the monomer (A).
- the copolymers used according to the invention contain at least one aliphatic or aromatic monoolefin.
- suitable monomers (B) are: 1-butene, isobutene, 1-pentene, 1-hexene, diisobutene (2-methyl-4,4-dimethyl-1-pentene), 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, Ci8-C24- ⁇ -olefins such as 1-octadecene, 1-eicosene, 1-docoses and 1-tetracoses, C2o-C24- ⁇ -olefin mixtures, 1-hexacoses, polyisobutenes with im Average 12 to 100 carbon atoms and styrene.
- the copolymers used according to the invention as component (B) preferably contain a mixture of (B1) at least one monoolefin having ⁇ 8 carbon atoms and (B2) at least one monoolefin having> 10 carbon atoms.
- isobutene, diisobutene and styrene are suitable as monoolefins (B1).
- Particularly suitable monoolefins (B2) are 1-dodecene, Ci8-C24- ⁇ -olefins, C20-C24-0C-olefin mixtures and polyisobutenes having an average of 12 to 100 carbon atoms.
- the copolymers used according to the invention contain from 20 to 80% by weight, preferably from 30 to 70% by weight, of the monomer (B).
- Very particularly preferred copolymers used according to the invention are by free-radical copolymerization of (A) 30 to 70 wt .-% maleic acid (anhydride), (B1) 20 to 40 wt .-% isobutene and (B2) 5 to 20 wt .-% of a Ci 8 -C 2 4- ⁇ -olefin obtains lent.
- the copolymers used according to the invention have an average molecular weight Mw of from 1,000 to 200,000 g / mol, preferably from 2,000 to 50,000 g / mol (determined by gel permeation chromatography at room temperature with aqueous eluent).
- Their K values are accordingly from 10 to 150, preferably from 15 to 60 (measured at pH 7 in 1% strength by weight aqueous solution at 25 ° C., according to H. Fikentscher, Cellulose-Chemie, Vol. 13, pp. 58-64 and 71-74 (1932)).
- copolymers used according to the invention can be prepared by known processes.
- aqueous polymer solutions or dispersions which have a solids content of from 10 to 70% by weight, preferably from 25 to 60% by weight.
- the viscosity of aqueous Waschschslurries in particular of the slurries, which are dried to produce granular or powdered detergent compositions, effectively lower, so that even highly concentrated slurries can be handled easily.
- the slurry concentrations can always be> 50% by weight, preferably> 60% by weight, based on the anhydrous detergent components.
- copolymers used according to the invention additionally bring about stabilization and homogenization of the slurries and prevent separations.
- Solid detergent formulations according to the invention which comprise the copolymers used according to the invention advantageously have e.g. following composition:
- an organic cobuilder (d) 0 to 10% by weight of an organic cobuilder and (e) from 0% to 60% by weight of other conventional ingredients such as sizing agents, enzymes, perfume, chelating agents, corrosion inhibitors, bleaches, bleach activators, bleach catalysts, dye transfer inhibitors, grayness inhibitors, soil release polyesters, fiber and color protective additives, silicones, dyes, Bactericides, dissolution enhancers and / or disintegrants,
- Suitable nonionic surfactants (b) are, in particular:
- Alkoxylated C 8 -C 22 -alcohols such as fatty alcohol alkoxylates, oxo alcohol alkoxylates and Guerbet alcohol alkoxylates:
- the alkoxylation can be carried out using C 2 -C 20 -alkylene oxides, preferably ethylene oxide, propylene oxide and / or butylene oxide.
- Preferred alkylene oxide is ethylene oxide.
- the alcohols preferably have 10 to 18 carbon atoms.
- Alkylphenolalkoxylate in particular alkylphenol ethoxylates containing C6-Ci4-alkyl chains and 5 to 30 moles of alkylene oxide / mol.
- N-alkylglucamides fatty acid amide alkoxylates, fatty acid alkanolamide alkoxylates and block copolymers of ethylene oxide, propylene oxide and / or butylene oxide.
- Suitable anionic surfactants are, for example:
- Sulfates of (fatty) alcohols having 8 to 22, preferably 10 to 18, carbon atoms in particular CgCn alcohol sulfates, Ci2Ci4-alcohol sulfates, Ci2-Ci8-alcohol sulfate, lauryl sulfate, cetyl sulfate, myristyl sulfate, palmitylsulfate, stearyl sulfate and tallow fatty alcohol sulfate.
- Sulfated alkoxylated Cs-C22 alcohols (alkyl ether sulfates): Compounds of this type are prepared, for example, by first alkoxylating a C 8 -C 22 -alcohol, preferably a C 10 -C 18 -alcohol, for example a fatty alcohol, and then sulfating the alkoxylation product.
- a C 8 -C 22 -alcohol preferably a C 10 -C 18 -alcohol, for example a fatty alcohol
- sulfating the alkoxylation product for the alkoxylation is preferably used ethylene oxide.
- Linear Cs-CaO alkylbenzenesulfonates (LAS), preferably linear Cg-C 13 -alkylbenzenesulfonates and -alkyltoluenesulfonates.
- Alkanesulfonates especially C8-C24, preferably Clo-Cis-alkanesulfonates.
- Soaps such as the Na and K salts of C8-C24 carboxylic acids.
- the anionic surfactants are preferably added to the detergent in the form of salts.
- Suitable salts are e.g. Alkali metal salts such as sodium, potassium and lithium salts, and ammonium salts such as hydroxyethylammonium, di (hydroxyethyl) ammonium and tri (hydroxyethyl) ammonium salts.
- Particularly suitable cationic surfactants are:
- Esterquats especially quaternary esterified mono-, di- and trialkanolamines esterified with Cs-C22 carboxylic acids;
- R 1 Ci-C 25 alkyl or C 2 -C 25 alkenyl
- R 2 is C 1 -C 4 -alkyl or C 1 -C 4 -hydroxyalkyl
- R 3 is C 1 -C 4 -alkyl, C 1 -C 4 -hydroxyalkyl or a radical R 1 - (CO) -X- (CH 2 ) P - (X: -O- or
- R 1 is C 7 -C 22 alkyl
- Suitable inorganic builders are, in particular: Crystalline and amorphous aluminosilicates with ion-exchanging properties, especially zeolites:
- zeolites Various types of zeolites are suitable, in particular the zeolites A, X, B, P, MAP and HS in their Na form or in forms in which Na is partially reactive with other cations as Li, K, Ca, Mg or ammonium is exchanged.
- Crystalline silicates in particular disilicates and phyllosilicates, e.g. ⁇ - and ⁇ -Na2Si2 ⁇
- the silicates can be used in the form of their alkali metal, alkaline earth metal or ammonium salts, preference being given to the Na, Li and Mg silicates.
- Amorphous silicates such as sodium metasilicate and amorphous disilicate.
- Carbonates and bicarbonates can be used in the form of their alkali metal, alkaline earth metal or ammonium salts. Preferred are Na, Li and
- Mg carbonates and hydrogencarbonates in particular sodium carbonate and / or sodium bicarbonate.
- Polyphosphates such as pentasodium triphosphate.
- organic cobuilders are particularly suitable:
- Low molecular weight carboxylic acids such as citric acid, hydrophobically modified citric acid, eg. , Agaricic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, succinic acid, imidodisuccinic acid, hydroxydisuccinic acid, oxydibrenic acid, propane tricarboxylic acid, butanetetracarboxylic acid, cyclopentanetetracarboxylic acid, alkyl and alkenyl succinic acids and aminopolycarboxylic acids, e.g.
- citric acid hydrophobically modified citric acid
- hydrophobically modified citric acid eg. , Agaricic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, succinic acid, imidodisuccinic acid, hydroxydisuccinic acid, oxydibrenic acid, propane tricarboxylic acid, butanetetracarboxylic acid,
- Nitrilotriacetic acid ⁇ -alaninediacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, serinediacetic acid, isoserinediacetic acid, glutamic diacetic acid, N- (2-hydroxyethyl) iminodiacetic acid, ethylenediamine disuccinic acid and methyl- and ethylglycinediacetic acid.
- Oligomeric and polymeric carboxylic acids such as homopolymers of acrylic acid and aspartic acid, oligomaleic acids, copolymers of maleic acid with acrylic acid, methacrylic acid or C 2 -C 22 olefins, e.g. Isobutene or long-chain ⁇ -olefins,
- Vinyl-C 1 -C -alkyl ethers vinyl acetate, vinyl propionate, (meth) acrylic esters of C 1 -C 8 -alcohols and styrene.
- Preferred are the homopolymers of acrylic acid and copolymers of acrylic acid with maleic acid.
- the oligomeric and polymeric carboxylic acids are used in acid form or as the sodium salt.
- Suitable bleaching agents are, for example, adducts of hydrogen peroxide with inorganic salts, such as sodium perborate monohydrate, sodium perborate tetrahydrate and sodium carbonate perhydrate, and percarboxylic acids, such as phthalimidopercaproic acid.
- Suitable bleach activators are e.g. N, N, N ', N'-tetraacetylethylenediamine (TAED), sodium p-nonanoyloxybenzenesulfonate and N-methylmorpholinium acetonitrile methylsulfate.
- TAED tetraacetylethylenediamine
- Enzymes preferably used in detergents are proteases, lipases, amylases, cellulases, oxidases and peroxidases.
- Suitable color transfer inhibitors are, for example, homo-, co- and graft polymers of 1-vinylpyrrolidone, 1-vinylimidazole or 4-vinylpyridine-N-oxide. Homo- and copolymers of 4-vinylpyridine reacted with chloroacetic acid are also suitable as color transfer inhibitors.
- Detergent ingredients are otherwise well known. Detailed descriptions are e.g. in WO-A-99/06524 and 99/04313 as well as in Liquid Detergents, Editor: Kuo-Yann Lai, Surfactant Sei. Ser., Vol. 67, Marcel Decker, New York, 1997, p. 272-304, to find.
- the viscosity-lowering effect of the copolymer P was investigated in two detergent slurries.
- the copolymer P was a copolymer of maleic anhydride, isobutene and 1-octadecene in a weight ratio of 65: 26: 9, having an average molecular weight Mw of 3,000 g / mol and a K value of 24 (measured at pH 7 in 1 wt .-% aqueous solution at 25 ° C) had.
- the copolymer was used in the form of a 40 wt .-% aqueous solution.
- the two detergent slurries were prepared as follows:
- Two different detergent slurries were prepared with stirring in a 500 ml heatable double-walled stainless steel vessel.
- the liquid components were first heated to 50 ° C. with stirring for 10 minutes.
- the stirrer used had a torque absorption.
- the previously mixed solid components were then uniformly metered in over 4 minutes, with the slurry being further stirred at 150 rpm.
- the slurry was stirred with a constant number of revolutions while determining the torque.
- the torque reflects the force needed to stir the slurry at a constant speed of rotation. The lower the torque, the lower the viscosity of the detergent slurry.
- Table 1 lists the compositions of the detergent slurries. The amounts mentioned here refer to feedstocks in anhydrous form, i. without water or water of crystallization contained in the total water content.
- Table 2 summarizes the torques obtained after each 30 minutes. For comparison, the results obtained without polymer addition are included.
- nb means that the viscosity of the slurries was very high and the torque was no longer determinable.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL06793896T PL1941016T3 (en) | 2005-10-05 | 2006-09-29 | Method for producing granular or powdery detergent compositions |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005047833A DE102005047833A1 (en) | 2005-10-05 | 2005-10-05 | Process for the preparation of granular or powdered detergent compositions |
PCT/EP2006/066868 WO2007039554A1 (en) | 2005-10-05 | 2006-09-29 | Method for producing granular or powdery detergent compositions |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1941016A1 true EP1941016A1 (en) | 2008-07-09 |
EP1941016B1 EP1941016B1 (en) | 2012-07-04 |
Family
ID=37507316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06793896A Not-in-force EP1941016B1 (en) | 2005-10-05 | 2006-09-29 | Method for producing granular or powdery detergent compositions |
Country Status (9)
Country | Link |
---|---|
US (1) | US8486884B2 (en) |
EP (1) | EP1941016B1 (en) |
JP (1) | JP5080480B2 (en) |
CN (1) | CN101278038B (en) |
CA (1) | CA2624919C (en) |
DE (1) | DE102005047833A1 (en) |
ES (1) | ES2388701T3 (en) |
PL (1) | PL1941016T3 (en) |
WO (1) | WO2007039554A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005041349A1 (en) * | 2005-08-31 | 2007-03-01 | Basf Ag | Phosphate-free cleaning formulation, useful for dishwasher, comprises: copolymers from monoethylenic unsaturated monocarboxylic acids; complexing agent; nonionic surfactant, bleaching agent; builder; enzyme; and additives |
JP5208906B2 (en) * | 2009-11-13 | 2013-06-12 | 本田技研工業株式会社 | Inverted pendulum type vehicle |
WO2019211170A1 (en) * | 2018-05-04 | 2019-11-07 | Basf Se | Granules or powders and methods for their manufacture |
CN109234070B (en) * | 2018-09-18 | 2020-12-15 | 祥瑞博特生物科技(北京)有限责任公司 | Washing product containing styrene-acrylic acid-maleic anhydride copolymer and application thereof |
Family Cites Families (27)
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BE757034A (en) | 1969-10-08 | 1971-04-05 | Knapsack Ag | SUPPORTING SUBSTANCES FOR DETERIVES AND CLEANING AGENTS |
US3676373A (en) * | 1970-07-20 | 1972-07-11 | Gulf Research Development Co | Detergent compositions |
GB1551239A (en) | 1975-09-21 | 1979-08-30 | Procter & Gamble | Built detergent compositions |
JPS5919598B2 (en) * | 1977-09-12 | 1984-05-07 | ライオン株式会社 | Granular detergent composition with excellent rinsability and powder properties |
DE2857300A1 (en) * | 1977-11-17 | 1980-06-26 | Procter & Gamble | GRAINY DETERGENT AND DETERGENT COMPOSITIONS FOR IMPROVED REMOVAL OF Greasy Dirt |
JPS57192499A (en) * | 1981-05-20 | 1982-11-26 | Lion Corp | Manufacture of granular detergent |
EP0104679B1 (en) * | 1982-09-01 | 1989-08-09 | Unilever N.V. | Abrasive agglomerates for use in scouring cleaning compositions |
US4762637A (en) * | 1986-11-14 | 1988-08-09 | Lever Brothers Company | Encapsulated bleach particles for machine dishwashing compositions |
US5205960A (en) * | 1987-12-09 | 1993-04-27 | S. C. Johnson & Son, Inc. | Method of making clear, stable prespotter laundry detergent |
US5376288A (en) * | 1989-06-21 | 1994-12-27 | Noro Nordisk A/S | Detergent additive granulate and detergent |
GB8928023D0 (en) | 1989-12-12 | 1990-02-14 | Unilever Plc | Detergent compositions |
US5232622A (en) * | 1990-06-20 | 1993-08-03 | Rohm And Haas Company | Chlorine-free machine dishwashing |
US5281352A (en) * | 1992-08-27 | 1994-01-25 | Church & Dwight Co., Inc. | Low-phosphate machine dishwashing detergents |
DE4300239A1 (en) | 1993-01-07 | 1994-07-14 | Basf Ag | Use of partially esterified copolymers containing carboxyl groups as dispersants |
WO1996009367A1 (en) * | 1994-09-22 | 1996-03-28 | Crosfield Limited | Silicates granules and method for manufacturing the same |
AU4412896A (en) | 1994-12-05 | 1996-06-26 | Colgate-Palmolive Company, The | Granular detergent compositions containing deflocculating polymers |
US5733861A (en) | 1995-05-23 | 1998-03-31 | Basf Corporation | Hydrophilic copolymers for reducing the viscosity of detergent slurries |
US5595968A (en) | 1995-05-23 | 1997-01-21 | Basf Corporation | Polymeric dispersants for soda ash based detergent slurries |
US5618782A (en) | 1995-05-23 | 1997-04-08 | Basf Corporation | Hydrophilic copolymers for reducing the viscosity of detergent slurries |
FR2739866A1 (en) * | 1995-10-13 | 1997-04-18 | Rohm & Haas France | CLEANING COMPOSITIONS CONTAINING A LIME SOAP DISPERSER AND PROCESS FOR PREPARING THE SAME |
BR9708274A (en) * | 1996-03-26 | 1999-08-03 | Basf Ag | Mixing formulation for detergent or rinse aid detergent or rinse aid and use of formulation |
DE19621983A1 (en) | 1996-06-03 | 1997-12-04 | Basf Ag | Use of copolymers of hydrophilic and hydrophobic monomers to increase the rate of dissolution of particulate detergent formulations in water |
JP3680453B2 (en) * | 1996-10-16 | 2005-08-10 | チッソ株式会社 | Thermoplastic resin composition for cleaning |
US6716808B1 (en) * | 1999-01-21 | 2004-04-06 | The Procter & Gamble Company | Detergent compositions comprising hybrid zeolite builders containing an occluded nonsilicate |
DE10104469A1 (en) * | 2001-02-01 | 2002-08-08 | Basf Ag | Copolymers to prevent glass corrosion |
DE10104470A1 (en) * | 2001-02-01 | 2002-08-08 | Basf Ag | Detergent formulations to prevent discoloration of plastic objects |
FR2862235B1 (en) * | 2003-11-13 | 2007-12-28 | Rhodia Chimie Sa | EMULSION FOR VEHICULATING HYDROPHOBIC ACTIVE MATERIAL TO AQUEOUS SUBSTRATE |
-
2005
- 2005-10-05 DE DE102005047833A patent/DE102005047833A1/en not_active Withdrawn
-
2006
- 2006-09-29 CN CN2006800366736A patent/CN101278038B/en not_active Expired - Fee Related
- 2006-09-29 WO PCT/EP2006/066868 patent/WO2007039554A1/en active Application Filing
- 2006-09-29 US US12/088,891 patent/US8486884B2/en not_active Expired - Fee Related
- 2006-09-29 ES ES06793896T patent/ES2388701T3/en active Active
- 2006-09-29 CA CA2624919A patent/CA2624919C/en not_active Expired - Fee Related
- 2006-09-29 JP JP2008533982A patent/JP5080480B2/en not_active Expired - Fee Related
- 2006-09-29 EP EP06793896A patent/EP1941016B1/en not_active Not-in-force
- 2006-09-29 PL PL06793896T patent/PL1941016T3/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2007039554A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN101278038A (en) | 2008-10-01 |
JP2009511651A (en) | 2009-03-19 |
CN101278038B (en) | 2012-11-28 |
ES2388701T3 (en) | 2012-10-17 |
EP1941016B1 (en) | 2012-07-04 |
CA2624919C (en) | 2015-01-27 |
PL1941016T3 (en) | 2012-10-31 |
US20080255022A1 (en) | 2008-10-16 |
CA2624919A1 (en) | 2007-04-12 |
JP5080480B2 (en) | 2012-11-21 |
WO2007039554A1 (en) | 2007-04-12 |
DE102005047833A1 (en) | 2007-04-19 |
US8486884B2 (en) | 2013-07-16 |
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