US20060264337A1 - Dot 4 brake fluids - Google Patents
Dot 4 brake fluids Download PDFInfo
- Publication number
- US20060264337A1 US20060264337A1 US10/548,173 US54817305A US2006264337A1 US 20060264337 A1 US20060264337 A1 US 20060264337A1 US 54817305 A US54817305 A US 54817305A US 2006264337 A1 US2006264337 A1 US 2006264337A1
- Authority
- US
- United States
- Prior art keywords
- glycol
- brake fluid
- brake
- weight
- dot
- 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.)
- Abandoned
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 65
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims abstract description 45
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims abstract description 18
- 150000001346 alkyl aryl ethers Chemical class 0.000 claims abstract description 11
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 8
- -1 alkyl radical Chemical class 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000007797 corrosion Effects 0.000 claims description 10
- 238000005260 corrosion Methods 0.000 claims description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical class OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical class OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 239000003112 inhibitor Substances 0.000 claims description 7
- 150000001983 dialkylethers Chemical class 0.000 claims description 5
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 claims description 5
- 102100024737 Deoxynucleotidyltransferase terminal-interacting protein 2 Human genes 0.000 claims description 4
- 101000626071 Homo sapiens Deoxynucleotidyltransferase terminal-interacting protein 2 Proteins 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- PAFZNILMFXTMIY-UHFFFAOYSA-N cyclohexylamine Chemical compound NC1CCCCC1 PAFZNILMFXTMIY-UHFFFAOYSA-N 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 4
- 239000000194 fatty acid Chemical class 0.000 claims description 4
- 229930195729 fatty acid Chemical class 0.000 claims description 4
- 150000004665 fatty acids Chemical class 0.000 claims description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 4
- 229920001515 polyalkylene glycol Polymers 0.000 claims description 4
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical class C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 claims description 4
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 claims description 4
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 3
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 3
- UWHCKJMYHZGTIT-UHFFFAOYSA-N Tetraethylene glycol, Natural products OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 150000002148 esters Chemical class 0.000 claims description 3
- MLHQPPYBHZSBCX-UHFFFAOYSA-N 1-(2-hydroxyethoxy)propan-2-ol Chemical compound CC(O)COCCO MLHQPPYBHZSBCX-UHFFFAOYSA-N 0.000 claims description 2
- SBGFNHWKIOFPRM-UHFFFAOYSA-N 1-[2-(2-hydroxyethoxy)ethoxy]hexan-2-ol Chemical compound CCCCC(O)COCCOCCO SBGFNHWKIOFPRM-UHFFFAOYSA-N 0.000 claims description 2
- HQSAHDIYVFRDQJ-UHFFFAOYSA-N 1-[2-[2-(2-hydroxyethoxy)ethoxy]ethoxy]propan-2-ol Chemical compound CC(O)COCCOCCOCCO HQSAHDIYVFRDQJ-UHFFFAOYSA-N 0.000 claims description 2
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 claims description 2
- LCZVSXRMYJUNFX-UHFFFAOYSA-N 2-[2-(2-hydroxypropoxy)propoxy]propan-1-ol Chemical compound CC(O)COC(C)COC(C)CO LCZVSXRMYJUNFX-UHFFFAOYSA-N 0.000 claims description 2
- AQRQHYITOOVBTO-UHFFFAOYSA-N 2-[2-[2-[2-(2-hydroxypropoxy)propoxy]propoxy]propoxy]propan-1-ol Chemical compound CC(O)COC(C)COC(C)COC(C)COC(C)CO AQRQHYITOOVBTO-UHFFFAOYSA-N 0.000 claims description 2
- UDOJNGPPRYJMKR-UHFFFAOYSA-N 2-[2-[2-[2-[2-(2-hydroxypropoxy)propoxy]propoxy]propoxy]propoxy]propan-1-ol Chemical compound CC(O)COC(C)COC(C)COC(C)COC(C)COC(C)CO UDOJNGPPRYJMKR-UHFFFAOYSA-N 0.000 claims description 2
- QVHMSMOUDQXMRS-UHFFFAOYSA-N PPG n4 Chemical compound CC(O)COC(C)COC(C)COC(C)CO QVHMSMOUDQXMRS-UHFFFAOYSA-N 0.000 claims description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 2
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 2
- 125000005265 dialkylamine group Chemical group 0.000 claims description 2
- 150000002009 diols Chemical class 0.000 claims description 2
- IIRDTKBZINWQAW-UHFFFAOYSA-N hexaethylene glycol Chemical compound OCCOCCOCCOCCOCCOCCO IIRDTKBZINWQAW-UHFFFAOYSA-N 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 2
- JLFNLZLINWHATN-UHFFFAOYSA-N pentaethylene glycol Chemical compound OCCOCCOCCOCCOCCO JLFNLZLINWHATN-UHFFFAOYSA-N 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 abstract description 8
- 229920000151 polyglycol Polymers 0.000 description 14
- 239000010695 polyglycol Substances 0.000 description 14
- 239000000203 mixture Substances 0.000 description 8
- 229920001971 elastomer Polymers 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 150000002739 metals Chemical class 0.000 description 5
- 235000013772 propylene glycol Nutrition 0.000 description 5
- 239000005060 rubber Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 150000003254 radicals Chemical class 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- LVTYICIALWPMFW-UHFFFAOYSA-N diisopropanolamine Chemical compound CC(O)CNCC(C)O LVTYICIALWPMFW-UHFFFAOYSA-N 0.000 description 3
- UAOMVDZJSHZZME-UHFFFAOYSA-N diisopropylamine Chemical compound CC(C)NC(C)C UAOMVDZJSHZZME-UHFFFAOYSA-N 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000011133 lead Substances 0.000 description 3
- 125000004430 oxygen atom Chemical group O* 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
- ZETIVVHRRQLWFW-UHFFFAOYSA-N 3-nitrobenzaldehyde Chemical compound [O-][N+](=O)C1=CC=CC(C=O)=C1 ZETIVVHRRQLWFW-UHFFFAOYSA-N 0.000 description 2
- KDCGOANMDULRCW-UHFFFAOYSA-N 7H-purine Chemical compound N1=CNC2=NC=NC2=C1 KDCGOANMDULRCW-UHFFFAOYSA-N 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 2
- WWZKQHOCKIZLMA-UHFFFAOYSA-N Caprylic acid Natural products CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001060 Gray iron Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 150000005215 alkyl ethers Chemical class 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 150000001642 boronic acid derivatives Chemical class 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- JQVDAXLFBXTEQA-UHFFFAOYSA-N dibutylamine Chemical compound CCCCNCCCC JQVDAXLFBXTEQA-UHFFFAOYSA-N 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N methyl undecanoic acid Natural products CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N n-hexadecanoic acid Natural products CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 239000005028 tinplate Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 125000004209 (C1-C8) alkyl group Chemical group 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 description 1
- BMVXCPBXGZKUPN-UHFFFAOYSA-N 1-hexanamine Chemical compound CCCCCCN BMVXCPBXGZKUPN-UHFFFAOYSA-N 0.000 description 1
- WJFKNYWRSNBZNX-UHFFFAOYSA-N 10H-phenothiazine Chemical compound C1=CC=C2NC3=CC=CC=C3SC2=C1 WJFKNYWRSNBZNX-UHFFFAOYSA-N 0.000 description 1
- RMFWVOLULURGJI-UHFFFAOYSA-N 2,6-dichloro-7h-purine Chemical compound ClC1=NC(Cl)=C2NC=NC2=N1 RMFWVOLULURGJI-UHFFFAOYSA-N 0.000 description 1
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 1
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 description 1
- COBPKKZHLDDMTB-UHFFFAOYSA-N 2-[2-(2-butoxyethoxy)ethoxy]ethanol Chemical compound CCCCOCCOCCOCCO COBPKKZHLDDMTB-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- VQNDBXJTIJKJPV-UHFFFAOYSA-N 2h-triazolo[4,5-b]pyridine Chemical compound C1=CC=NC2=NNN=C21 VQNDBXJTIJKJPV-UHFFFAOYSA-N 0.000 description 1
- NSPMIYGKQJPBQR-UHFFFAOYSA-N 4H-1,2,4-triazole Chemical compound C=1N=CNN=1 NSPMIYGKQJPBQR-UHFFFAOYSA-N 0.000 description 1
- LRUDIIUSNGCQKF-UHFFFAOYSA-N 5-methyl-1H-benzotriazole Chemical compound C1=C(C)C=CC2=NNN=C21 LRUDIIUSNGCQKF-UHFFFAOYSA-N 0.000 description 1
- ZNYRFEPBTVGZDN-UHFFFAOYSA-N 5S,6S-epoxy-15R-hydroxy-ETE Chemical compound COCCOCCOCCOCCO ZNYRFEPBTVGZDN-UHFFFAOYSA-N 0.000 description 1
- ZKBQDFAWXLTYKS-UHFFFAOYSA-N 6-Chloro-1H-purine Chemical compound ClC1=NC=NC2=C1NC=N2 ZKBQDFAWXLTYKS-UHFFFAOYSA-N 0.000 description 1
- HOSGXJWQVBHGLT-UHFFFAOYSA-N 6-hydroxy-3,4-dihydro-1h-quinolin-2-one Chemical group N1C(=O)CCC2=CC(O)=CC=C21 HOSGXJWQVBHGLT-UHFFFAOYSA-N 0.000 description 1
- GOILPRCCOREWQE-UHFFFAOYSA-N 6-methoxy-7h-purine Chemical compound COC1=NC=NC2=C1NC=N2 GOILPRCCOREWQE-UHFFFAOYSA-N 0.000 description 1
- DZDVMKLYUKZMKK-UHFFFAOYSA-N 7-methyloctan-1-amine Chemical compound CC(C)CCCCCCN DZDVMKLYUKZMKK-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- QZYNAQSEUGVYTI-BGQPXYRPSA-N C1=CC2=C(NC=N2)[Y]=C1.CC Chemical compound C1=CC2=C(NC=N2)[Y]=C1.CC QZYNAQSEUGVYTI-BGQPXYRPSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- KKUKTXOBAWVSHC-UHFFFAOYSA-N Dimethylphosphate Chemical compound COP(O)(=O)OC KKUKTXOBAWVSHC-UHFFFAOYSA-N 0.000 description 1
- FAIXYKHYOGVFKA-UHFFFAOYSA-N Kinetin Natural products N=1C=NC=2N=CNC=2C=1N(C)C1=CC=CO1 FAIXYKHYOGVFKA-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- VBBRYJMZLIYUJQ-UHFFFAOYSA-N O=C1CC1 Chemical compound O=C1CC1 VBBRYJMZLIYUJQ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 125000004453 alkoxycarbonyl group Chemical group 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- OOSPDKSZPPFOBR-UHFFFAOYSA-N butyl dihydrogen phosphite Chemical compound CCCCOP(O)O OOSPDKSZPPFOBR-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 125000000753 cycloalkyl group Chemical group 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- WZPMZMCZAGFKOC-UHFFFAOYSA-N diisopropyl hydrogen phosphate Chemical compound CC(C)OP(O)(=O)OC(C)C WZPMZMCZAGFKOC-UHFFFAOYSA-N 0.000 description 1
- 229940043279 diisopropylamine Drugs 0.000 description 1
- CZHYKKAKFWLGJO-UHFFFAOYSA-N dimethyl phosphite Chemical compound COP([O-])OC CZHYKKAKFWLGJO-UHFFFAOYSA-N 0.000 description 1
- WEHWNAOGRSTTBQ-UHFFFAOYSA-N dipropylamine Chemical compound CCCNCCC WEHWNAOGRSTTBQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- ZJXZSIYSNXKHEA-UHFFFAOYSA-N ethyl dihydrogen phosphate Chemical compound CCOP(O)(O)=O ZJXZSIYSNXKHEA-UHFFFAOYSA-N 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 125000001188 haloalkyl group Chemical group 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- QPPQHRDVPBTVEV-UHFFFAOYSA-N isopropyl dihydrogen phosphate Chemical compound CC(C)OP(O)(O)=O QPPQHRDVPBTVEV-UHFFFAOYSA-N 0.000 description 1
- QANMHLXAZMSUEX-UHFFFAOYSA-N kinetin Chemical compound N=1C=NC=2N=CNC=2C=1NCC1=CC=CO1 QANMHLXAZMSUEX-UHFFFAOYSA-N 0.000 description 1
- 229960001669 kinetin Drugs 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- IOQPZZOEVPZRBK-UHFFFAOYSA-N octan-1-amine Chemical compound CCCCCCCCN IOQPZZOEVPZRBK-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229950000688 phenothiazine Drugs 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 125000002924 primary amino group Chemical class [H]N([H])* 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
- C10M111/02—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a non-macromolecular organic compound
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
- C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/0215—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
- C10M2207/0225—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/024—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings having at least two phenol groups but no condensed ring
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
- C10M2209/1045—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
- C10M2209/1055—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/108—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified
- C10M2209/1085—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2215/042—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/20—Containing nitrogen-to-oxygen bonds
- C10M2215/202—Containing nitrogen-to-oxygen bonds containing nitro groups
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/223—Five-membered rings containing nitrogen and carbon only
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/08—Hydraulic fluids, e.g. brake-fluids
Definitions
- the present invention relates to novel DOT 4 brake fluids, in which the addition of borates (boric acid esters) is not necessary.
- the brake fluids comprise
- Hydraulic fluids and in particular brake fluids for motor vehicles are subject to very high requirements with respect to their chemical and physical properties.
- DOT US Department of Transportation
- FMVSS No. 116 Federal Motor Vehicle Safety Standard
- SAE J 1704 Standard SAE J 1704 published by the Society of Automotive Engineers
- modern brake fluids should on the one hand have a high equilibrium reflux boiling point (ERBP) and high wet ERBP, but on the other hand should also have a viscosity which changes only slightly within a wide temperature range.
- ERBP ⁇ 230° C.
- ERBP ⁇ 155° C.
- Viscosity at ⁇ 40° C. ⁇ 1800 mm 2 /s
- DOT 4 brake fluids always contain boric acid esters, for example methyltriglycol borate, which can chemically eliminate certain amounts of penetrating water from the brake fluid by hydrolysis.
- boric acid esters are themselves hygroscopic, with the result that such DOT 4 brake fluids, particularly in regions of high relative humidity, for example in tropical and subtropical regions, can very rapidly absorb so much moisture that, in spite of the trapping function of the boric acid esters, the operability of a brake system filled therewith can be adversely affected.
- DOT 4 brake fluids which contain from 54.5 to 92% of at least one boric acid ester, up to 20% of polyalkylene glycols and from 3 to 43% of polyglycol monoalkyl or dialkyl ethers, in addition to further additives.
- DOT 4 brake fluids which contain from 40 to 65% of polyglycol monoalkyl ethers, from 16 to 45% of polyglycols and from 10 to 19% of boric acid esters plus corrosion inhibitors.
- WO 00/46325 describes DOT 4 brake fluids which contain methyltriglycol borate, glycol ethers and glycols in different amounts and an additive system.
- WO 02/38711 discloses corresponding DOT 4 brake fluids which contain different methylpolyglycol borates, polyglycol monoalkyl ethers and corrosion inhibitors.
- DE 36 27 432 C2 describes borate-free brake fluids comprising from 30 to 80% of a glycol component and up to 70% of polyglycol alkyl ether.
- the glycol component in turn contains from 0 to 80, preferably from 55 to 80, % by weight of diethylene glycol and/or dipropylene glycol.
- the polyglycol alkyl ether component contains from 0 to 90, preferably from 0 to 50, % by weight of at least one polyglycol monoalkyl ether. In selected mixing ratios, these fluids fulfill the DOT 4 specification.
- a disadvantage in the case of these formulations is in particular the ERBP only just above the specification limit and moreover the use of polyglycol dialkyl ethers which are more expensive to synthesize and often also lead to incompatibility reactions of rubber and sealing materials.
- this brake fluid should not be very hygroscopic and should be capable of being used in regions of high relative humidity.
- it should be necessary to use only small amounts of boric acid esters or ideally the use of such esters should even be completely superfluous.
- novel fluids are free of boric acid esters.
- Diethylene glycol or dipropylene glycol or a mixture of diethylene glycol and dipropylene glycol in any desired ratio may be used.
- Diethylene glycol is preferred.
- Diethylene glycol and/or dipropylene glycol are present in the novel brake fluids in an amount of from 10 to 50, preferably from 20 to 40, % by weight.
- a further component of the novel brake fluid comprises one or more monoalkyl ethers of (poly)ethylene glycols and/or (poly)propylene glycols, which are present in the novel fluids in an amount of from 50 to 90, preferably from 60 to 80, % by weight.
- suitable (poly)ethylene glycols are monoethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol and hexaethylene glycol.
- suitable (poly)propylene glycols are monopropylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, pentapropylene glycol and hexapropylene glycol.
- Diethylene glycol, triethylene glycol and/or tetraethylene glycol are preferred.
- the alkyl radical in the monoalkyl ethers of (poly)ethylene glycol and (poly)propylene glycol used according to the invention is preferably a linear or branched C 1 -C 6 -alkyl radical. It is more preferable to use a linear or branched C 1 -C 4 -alkyl radical, for example methyl, ethyl, isopropyl, n-propyl, n-butyl, isobutyl, sec-butyl or tert-butyl.
- alkyl radicals are in particular methyl, ethyl, isopropyl or n-butyl.
- methyldiethylene glycol methyltriethylene glycol, methyltetraethylene glycol and/or butyltriethylene glycol is preferred.
- the novel brake fluids have wet ERBPs and in particular ERBPs which are close to those which have been achieved to date with borate-free brake fluids. They are comparable with those achieved today only with borate-containing fluids. Owing to the absence of borate, however, the novel fluids are substantially less hygroscopic than borate-containing ones. This is advantageous in particular during use in tropical and subtropical regions, since, although a part of the water is bound by the addition of borate, water is also relatively rapidly absorbed. This results in each case in a deterioration in the quality of the brake fluid. In particular, this loss of quality occurs frequently in the brake system of motor vehicles but also during storage and transport of the fluids. The novel brake fluids do not have said disadvantages.
- novel brake fluids may contain different amounts of boric acid esters.
- advantages according to the invention of low hygroscopicity are generally not achieved thereby. This is the case in particular when boric acid esters are added in the amounts customary according to the prior art.
- novel fluids are in particular free of polyalkylene glycol dialkyl ethers. Although these too may be present in different amounts, in general the advantages of the novel brake fluids, in particular the compatibility with rubber and sealing materials, are then not achieved, this too of course being dependent on the amount of any polyalkylene glycol dialkyl ethers present.
- polyglycols may be present as an optional component in the novel formulations.
- Relatively high-boiling reaction products of ethylene oxide and/or propylene oxide and/or butylene oxide with water or diol are preferably used.
- reaction products of mixtures of ethylene oxide and propylene oxide with water are used.
- the number of alkylene oxide units in said polyglycols is usually from 2 to 10, preferably 2 or 3, and in an amount of up to 5%.
- the effect of these high-boiling polyglycols is that of a lubricant, which is due substantially to an improvement in the temperature-viscosity behavior.
- the polyglycols impart sufficient viscosity to the polyglycol monoalkyl ethers, which often have low viscosity at high temperatures, and thus ensure sufficient lubrication. Sufficient lubrication is desired since, in the components of the motor vehicle brake system, rubber or elastomers have to slide on metal with very little wear.
- the novel DOT 4 brake fluids for motor vehicles furthermore contain from 0.001 to 10, preferably from 0.005 to 4, in particular from 0.005 to 1, % by weight of one or more corrosion inhibitors, for example 1H-1,2,3-benzotriazole, 1H-1,2,3-tolutriazole, hydrogenated 1H-1,2,3-tolutriazole, benzimidazole and/or derivatives thereof, alkali metal salts of phosphoric acid and phosphorous acid, fatty acids, preferably caprylic, lauric, palmitic, stearic or oleic acid, and alkali metal salts thereof, esters of phosphoric acid and of phosphorous acid, preferably ethyl phosphate, dimethyl phosphate, isopropyl phosphate, diisopropyl phosphate, butyl phosphite or dimethyl phosphite, mono- and dialkylamines which may be ethoxylated and salt
- novel brake fluids may also contain one or more of the heterocyclic compounds which are described in WO 01/90281 and are of the following formula where
- novel borate-free DOT 4 brake fluids may furthermore contain the formulations described in WO 02/081604 and comprising 1H-1,2,4-triazole.
- novel brake fluids may additionally contain the cyclic carboxylic acid derivatives which are mentioned in WO 00/65001 and are of the formula I where
- antioxidants e.g. phenothiazine and/or those based on phenol
- antifoams and markers are conventional antioxidants, e.g. phenothiazine and/or those based on phenol, and conventional antifoams and markers.
- novel borate-free DOT 4 brake fluids meet the requirements stated at the outset in an outstanding manner and moreover have generally good corrosion behavior compared with the prior art, i.e. very good corrosion prevention is ensured in the case of metals such as iron, steel, tin plate, cast iron (gray cast iron), lead, tin, chromium, zinc, aluminum, magnesium and alloys thereof and in the case of solder metals, for example tin solder, and in the case of nonferrous metals such as copper and alloys thereof, for example brass.
- metals such as iron, steel, tin plate, cast iron (gray cast iron), lead, tin, chromium, zinc, aluminum, magnesium and alloys thereof and in the case of solder metals, for example tin solder, and in the case of nonferrous metals such as copper and alloys thereof, for example brass.
- the novel borate-free DOT 4 brake fluid BF1 used had the following composition:
- the novel borate-free DOT 4 brake fluids have in particular a substantially higher ERBP which, in the case of BF 1, easily exceeds the minimum requirement according to FMVSS No. 116 by 20° C., and a lower water absorption and, associated therewith, a higher wet ERBP.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
- Braking Arrangements (AREA)
Abstract
A brake fluid comprises a) from 10 to 50, preferably from 20 to 40, % by weight of diethylene glycol and/or dipropylene glycol and b) from 50 to 90, preferably from 60 to 80, % by weight of one or more monoalkyl ethers of (poly)ethylene glycol and/or (poly)propylene glycol. The novel fluids are in particular free of borate and, owing to the low hygroscopicity, are suitable for use in regions of high relative humidity.
Description
- The present invention relates to novel DOT 4 brake fluids, in which the addition of borates (boric acid esters) is not necessary. The brake fluids comprise
-
- (a) from 10 to 50% by weight of diethylene glycol and/or dipropylene glycol and
- (b) from 50 to 90% by weight of (poly)ethylene glycol monoalkyl ether and/or (poly)propylene glycol monoalkyl ether
and are preferably free of polyglycol dialkyl diethers.
- Hydraulic fluids and in particular brake fluids for motor vehicles are subject to very high requirements with respect to their chemical and physical properties. According to the existing standards and specifications for brake fluids of the US Department of Transportation (DOT) in the Federal Motor Vehicle Safety Standard FMVSS No. 116 and the standard SAE J 1704 published by the Society of Automotive Engineers, modern brake fluids should on the one hand have a high equilibrium reflux boiling point (ERBP) and high wet ERBP, but on the other hand should also have a viscosity which changes only slightly within a wide temperature range.
- Accordingly, for a DOT 4 brake fluid according to FMVSS No. 116, the specification values shown below must be complied with:
ERBP: ≧230° C. Wet ERBP: ≧155° C. Viscosity at −40° C.: ≦1800 mm2/s - There are moreover more stringent requirements for sufficiently good protection of metals and nonferrous metals from corrosion by brake fluids, which can be achieved by corrosion inhibitor additives contained therein.
- Commercial DOT 4 brake fluids always contain boric acid esters, for example methyltriglycol borate, which can chemically eliminate certain amounts of penetrating water from the brake fluid by hydrolysis. A disadvantage is that boric acid esters are themselves hygroscopic, with the result that such DOT 4 brake fluids, particularly in regions of high relative humidity, for example in tropical and subtropical regions, can very rapidly absorb so much moisture that, in spite of the trapping function of the boric acid esters, the operability of a brake system filled therewith can be adversely affected.
- U.S. Pat. No. 3,625,899 describes DOT 4 brake fluids which contain from 54.5 to 92% of at least one boric acid ester, up to 20% of polyalkylene glycols and from 3 to 43% of polyglycol monoalkyl or dialkyl ethers, in addition to further additives.
- U.S. Pat. No. 3,972,822 describes DOT 4 brake fluids which contain from 40 to 65% of polyglycol monoalkyl ethers, from 16 to 45% of polyglycols and from 10 to 19% of boric acid esters plus corrosion inhibitors.
- WO 00/46325 describes DOT 4 brake fluids which contain methyltriglycol borate, glycol ethers and glycols in different amounts and an additive system.
- WO 02/38711, too, discloses corresponding DOT 4 brake fluids which contain different methylpolyglycol borates, polyglycol monoalkyl ethers and corrosion inhibitors.
- DE 36 27 432 C2 describes borate-free brake fluids comprising from 30 to 80% of a glycol component and up to 70% of polyglycol alkyl ether. The glycol component in turn contains from 0 to 80, preferably from 55 to 80, % by weight of diethylene glycol and/or dipropylene glycol. The polyglycol alkyl ether component contains from 0 to 90, preferably from 0 to 50, % by weight of at least one polyglycol monoalkyl ether. In selected mixing ratios, these fluids fulfill the DOT 4 specification. A disadvantage in the case of these formulations is in particular the ERBP only just above the specification limit and moreover the use of polyglycol dialkyl ethers which are more expensive to synthesize and often also lead to incompatibility reactions of rubber and sealing materials.
- There is furthermore a need for low viscosity brake fluids which fulfill the DOT 4 specification.
- It is an object of the present invention to provide such a brake fluid. Preferably, this brake fluid should not be very hygroscopic and should be capable of being used in regions of high relative humidity. In particular, it should be necessary to use only small amounts of boric acid esters or ideally the use of such esters should even be completely superfluous.
- We have found that this object is achieved by a brake fluid comprising
-
- a) from 10 to 50% by weight of diethylene glycol and/or dipropylene glycol and
- b) from 50 to 90% by weight of one or more monoalkyl ethers of (poly)ethylene glycol or (poly)propylene glycol.
- In particular, the novel fluids are free of boric acid esters.
- Diethylene glycol or dipropylene glycol or a mixture of diethylene glycol and dipropylene glycol in any desired ratio may be used. Diethylene glycol is preferred.
- Diethylene glycol and/or dipropylene glycol are present in the novel brake fluids in an amount of from 10 to 50, preferably from 20 to 40, % by weight.
- A further component of the novel brake fluid comprises one or more monoalkyl ethers of (poly)ethylene glycols and/or (poly)propylene glycols, which are present in the novel fluids in an amount of from 50 to 90, preferably from 60 to 80, % by weight.
- Examples of suitable (poly)ethylene glycols are monoethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol and hexaethylene glycol.
- Examples of suitable (poly)propylene glycols are monopropylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, pentapropylene glycol and hexapropylene glycol.
- Diethylene glycol, triethylene glycol and/or tetraethylene glycol are preferred.
- The alkyl radical in the monoalkyl ethers of (poly)ethylene glycol and (poly)propylene glycol used according to the invention is preferably a linear or branched C1-C6-alkyl radical. It is more preferable to use a linear or branched C1-C4-alkyl radical, for example methyl, ethyl, isopropyl, n-propyl, n-butyl, isobutyl, sec-butyl or tert-butyl.
- The alkyl radicals are in particular methyl, ethyl, isopropyl or n-butyl.
- In the present invention, the use of methyldiethylene glycol, methyltriethylene glycol, methyltetraethylene glycol and/or butyltriethylene glycol is preferred.
- The novel brake fluids have wet ERBPs and in particular ERBPs which are close to those which have been achieved to date with borate-free brake fluids. They are comparable with those achieved today only with borate-containing fluids. Owing to the absence of borate, however, the novel fluids are substantially less hygroscopic than borate-containing ones. This is advantageous in particular during use in tropical and subtropical regions, since, although a part of the water is bound by the addition of borate, water is also relatively rapidly absorbed. This results in each case in a deterioration in the quality of the brake fluid. In particular, this loss of quality occurs frequently in the brake system of motor vehicles but also during storage and transport of the fluids. The novel brake fluids do not have said disadvantages.
- It is true that the novel brake fluids may contain different amounts of boric acid esters. However, the advantages according to the invention of low hygroscopicity are generally not achieved thereby. This is the case in particular when boric acid esters are added in the amounts customary according to the prior art.
- Furthermore, the novel fluids are in particular free of polyalkylene glycol dialkyl ethers. Although these too may be present in different amounts, in general the advantages of the novel brake fluids, in particular the compatibility with rubber and sealing materials, are then not achieved, this too of course being dependent on the amount of any polyalkylene glycol dialkyl ethers present.
- Further polyglycols may be present as an optional component in the novel formulations. Relatively high-boiling reaction products of ethylene oxide and/or propylene oxide and/or butylene oxide with water or diol are preferably used. In particular, reaction products of mixtures of ethylene oxide and propylene oxide with water are used. The number of alkylene oxide units in said polyglycols is usually from 2 to 10, preferably 2 or 3, and in an amount of up to 5%.
- The effect of these high-boiling polyglycols is that of a lubricant, which is due substantially to an improvement in the temperature-viscosity behavior. The polyglycols impart sufficient viscosity to the polyglycol monoalkyl ethers, which often have low viscosity at high temperatures, and thus ensure sufficient lubrication. Sufficient lubrication is desired since, in the components of the motor vehicle brake system, rubber or elastomers have to slide on metal with very little wear.
- In a further embodiment, the novel DOT 4 brake fluids for motor vehicles furthermore contain from 0.001 to 10, preferably from 0.005 to 4, in particular from 0.005 to 1, % by weight of one or more corrosion inhibitors, for example 1H-1,2,3-benzotriazole, 1H-1,2,3-tolutriazole, hydrogenated 1H-1,2,3-tolutriazole, benzimidazole and/or derivatives thereof, alkali metal salts of phosphoric acid and phosphorous acid, fatty acids, preferably caprylic, lauric, palmitic, stearic or oleic acid, and alkali metal salts thereof, esters of phosphoric acid and of phosphorous acid, preferably ethyl phosphate, dimethyl phosphate, isopropyl phosphate, diisopropyl phosphate, butyl phosphite or dimethyl phosphite, mono- and dialkylamines which may be ethoxylated and salts thereof with mineral and fatty acids, preferably butylamine, hexylamine, octylamine, isononylamine, oleylamine, dipropylamine, diisopropylamine or dibutylamine, alkanolamines which may be ethoxylated, preferably mono-, di- or triethanolamine, N,N′-di-n-butylaminoethanol or 1,1′-iminodipropan-2-ol, cyclohexylamine, and/or nitro aromatics, preferably 3-nitrobenzaldehyde.
-
-
- (i) X is N, Y is CR and Z is N or
- (ii) X is N, Y is N and Z is N or CR or
- (iii) X is CR, Y is N and Z is N,
R, in each case independently of further radicals R present, being a hydrogen atom or a radical R1,
R1, in each case independently of further radicals R1 present, being alkyl, aryl, aralkyl, halogen, haloalkyl, unsubstituted or alkyl-, aryl- or aralkyl-substituted amino, a heterocyclic radical, cyano, carboxyl, alkoxycarbonyl, hydroxyl or alkoxy, said organic radicals R1 each being of 1 to 30 carbon atoms, and
n being 0, 1 or 2. Examples of preferred compounds of this type include purine, adeinine, 6-chloropurine, 2,6-dichloropurine, 6-methoxypurine, 1H-1,2,3-triazolo[4,5b]pyridine, 6-histaminopurine and 6-furfurylaminopurine.
- The novel borate-free DOT 4 brake fluids may furthermore contain the formulations described in WO 02/081604 and comprising 1H-1,2,4-triazole.
-
- X is an oxygen atom or a group of the formula N—R1,
- R1 being hydrogen or a linear or branched C1- to C20-alkyl group which additionally may be interrupted by up to 9 nonneighboring oxygen atoms and/or may carry up to 6 hydroxyl groups, or a cycloalkyl group or an unsubstituted or substituted phenyl group,
- A is a group of the formula —CR2R3—,
- R2 and R3 each being hydrogen or C1- to C8-alkyl groups which additionally may be interrupted by up to 4 nonneighboring oxygen atoms and/or may carry up to 3 hydroxyl groups, and
- n is from 2 to 7.
- These are suitable as components for reducing the low-temperature viscosity in the presence of water.
- Further components and assistants in the novel brake fluids for motor vehicles are conventional antioxidants, e.g. phenothiazine and/or those based on phenol, and conventional antifoams and markers.
- All percentages by weight stated above and below are based in each case on the total amount of the hydraulic fluid or of the brake fluid.
- The novel borate-free DOT 4 brake fluids meet the requirements stated at the outset in an outstanding manner and moreover have generally good corrosion behavior compared with the prior art, i.e. very good corrosion prevention is ensured in the case of metals such as iron, steel, tin plate, cast iron (gray cast iron), lead, tin, chromium, zinc, aluminum, magnesium and alloys thereof and in the case of solder metals, for example tin solder, and in the case of nonferrous metals such as copper and alloys thereof, for example brass.
- In addition to the hygroscopic properties substantially reduced owing to the freedom from borate, further advantages of the novel DOT 4 brake fluids for motor vehicles which may be singled out are their advantageous low-temperature viscosity, good water compatibility, a mild pH, good low temperature, high temperature and oxidation stability and good chemical stability, advantageous behavior toward (i.e. good compatibility with) materials such as rubbers, plastics, glue joints, fiber, elastomer and rubber seals and similar materials and good lubricating behavior.
- The examples which follow illustrate the invention without restricting it.
- The novel borate-free DOT 4 brake fluid BF1 used had the following composition:
-
31.0% of diethylene glycol 67.7% of a mixture of methyldiglycol, butyldiglycol, butyltriglycol and methyltetraglycol 1.3% of a mixture of 1,1′-iminodipropan-2-ol, bisphenol A, tolutriazole and 3-nitrobenzaldehyde - (corresponds to example 5 from DE 36 27 432 C2)
39% of diethylene glycol 26% of triethylene glycol 24% of triethylene glycol dimethyl ether 10% of methyltriglycol 1% of corrosion inhibitor (1,1′-iminodipropan-2-ol used) - Physical data:
BF 1 BF 2 (comparison) ERBP [° C.]: 251 234 wet ERBP [° C.]: 159 153 (Water absorption: (Water absorption: 3.27%; 3.93%; reference RM 71 3.73%) reference RM 71 3.70%) Viscosity −40° C.: 1393 1277 [mm2/s] - Compared with the prior art according to DE 3627432 C2, the novel borate-free DOT 4 brake fluids have in particular a substantially higher ERBP which, in the case of BF 1, easily exceeds the minimum requirement according to FMVSS No. 116 by 20° C., and a lower water absorption and, associated therewith, a higher wet ERBP.
- The novel brake fluids moreover lead to very good corrosion prevention, as shown by the results below for BF 1:
- Corrosion Test According to SAE J 1704, Test Duration 120 h/100° C.:
Weight change Metal [mg/cm2] Appearance Tin plate ±0.00 unchanged Steel +0.01 unchanged Aluminum ±0.00 unchanged Gray cast iron +0.04 unchanged Brass −0.05 slightly tarnished Copper −0.05 slightly tarnished Zinc +0.03 tarnished
pH before/after test: 9.9/9.6
Claims (14)
1-12. (canceled)
13. A brake fluid comprising
a) from 10 to 50% by weight of diethylene glycol and/or dipropylene glycol and
b) from 50 to 90% by weight of one or more monoalkyl ethers of (poly)ethylene glycol and/or (poly)propylene glycol.
14. The brake fluid as claimed in claim 13 , which contains no boric acid esters.
15. The brake fluid as claimed in claim 13 , which contains no polyalkylene glycol dialkyl ethers.
16. The brake fluid as claimed in claim 13 , wherein diethylene glycol is used as component a).
17. The brake fluid as claimed in claim 13 , wherein, in component b), the glycol is at least one selected from the group consisting of monoethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, hexaethylene glycol, monopropylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, pentapropylene glycol and hexapropylene glycol.
18. The brake fluid as claimed in claim 13 , wherein, in component b), the alkyl radical is selected from linear and branched C1-C6-alkyl radicals.
19. The brake fluid as claimed in claim 13 , wherein component b) is at least one selected from the group consisting of methyldiethylene glycol, methyltriethylene glycol, methyltetraethylene glycol and butyltriethylene glycol.
20. The brake fluid as claimed in claim 13 , wherein reaction products of ethylene oxide and/or propylene oxide and/or butylene oxide with water or diols, are also present.
21. The brake fluid as claimed in claim 13 , wherein from 0.01 to 10, % by weight of one or more corrosion inhibitors are present.
22. The brake fluid as claimed in claim 13 , wherein the corrosion inhibitors are at least one selected from the group consisting of 1H-1,2,3-benzotriazole, 1H-1,2,3-tolutriazole, hydrogenated 1H-1,2,3-tolutriazole, benzimidazole and/or derivatives thereof, alkali metal salts of phosphoric acid and phosphorous acid, fatty acids, and alkali metal salts thereof, esters of phosphoric acid and of phosphorous acid, mono- and dialkylamines which may be ethoxylated and salts thereof with mineral and fatty acids, alkanolamines which may be ethoxylated, cyclohexylamine and nitro aromatics.
23. The brake fluid as claimed in claim 13 , which complies with the following specification values (DOT 4):
24. The brake fluid as claimed in claim 13 wherein the brake fluid is utilized as a brake fluid in motor vehicles.
25. A motor vehicle brake system comprising the brake fluid as claimed in claim 13.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003110757 DE10310757A1 (en) | 2003-03-12 | 2003-03-12 | Brake fluid, used in motor vehicles, especially in regions with high humidity, comprises diethylene glycol and/or dipropylene glycol and (poly)ethylene glycol and/or (poly)propylene glycol monoalkyl ether |
DE10310757.6 | 2003-03-12 | ||
PCT/EP2004/002552 WO2004081155A1 (en) | 2003-03-12 | 2004-03-11 | Dot 4 brake fluids |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060264337A1 true US20060264337A1 (en) | 2006-11-23 |
Family
ID=32892070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/548,173 Abandoned US20060264337A1 (en) | 2003-03-12 | 2004-03-11 | Dot 4 brake fluids |
Country Status (15)
Country | Link |
---|---|
US (1) | US20060264337A1 (en) |
EP (1) | EP1603996A1 (en) |
JP (1) | JP2006519887A (en) |
KR (1) | KR20050107607A (en) |
CN (1) | CN1759165A (en) |
AR (1) | AR043582A1 (en) |
AU (1) | AU2004219905A1 (en) |
BR (1) | BRPI0408234A (en) |
CA (1) | CA2517683A1 (en) |
DE (1) | DE10310757A1 (en) |
MX (1) | MXPA05009288A (en) |
NO (1) | NO20054265L (en) |
TW (1) | TW200502379A (en) |
WO (1) | WO2004081155A1 (en) |
ZA (1) | ZA200507266B (en) |
Cited By (10)
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CN102618354A (en) * | 2012-03-08 | 2012-08-01 | 中国船舶重工集团公司第七一八研究所 | Method for preparing borate synthetic brake fluid |
WO2015116233A1 (en) * | 2014-02-03 | 2015-08-06 | Fuchs Petrolub Se | Additive compositions and industrial process fluids |
US9593289B2 (en) * | 2014-02-25 | 2017-03-14 | Jon A. Petty | Corrosion inhibiting hydraulic fluid additive |
CN106753737A (en) * | 2016-11-29 | 2017-05-31 | 湘潭电机股份有限公司 | A kind of brake fluid and preparation method thereof |
US9914105B2 (en) | 2014-11-07 | 2018-03-13 | Hyundai Motor Company | Phase-change suspension fluid composition including polyethylene oxide particles and method for manufacturing the same |
US10669503B2 (en) | 2014-02-25 | 2020-06-02 | Jon A. Petty | Corrosion inhibiting hydraulic fluid additive |
WO2021213693A1 (en) | 2020-04-23 | 2021-10-28 | Clariant International Ltd | Low viscosity functional fluid composition |
EP3929269A1 (en) | 2020-06-22 | 2021-12-29 | Clariant International Ltd | Low viscosity functional fluid composition |
EP4056669A1 (en) | 2021-03-12 | 2022-09-14 | Clariant International Ltd | Low viscosity functional fluid composition |
EP4130211A1 (en) | 2021-08-02 | 2023-02-08 | Clariant International Ltd | Low viscosity functional fluid composition |
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US7951757B2 (en) * | 2005-07-01 | 2011-05-31 | Dow Global Technologies Llc | Low viscosity functional fluids |
KR100792957B1 (en) * | 2007-01-03 | 2008-01-08 | 조이섭 | Breaking composition for automobile |
CN101955840A (en) * | 2010-08-24 | 2011-01-26 | 柳盛春 | High boiling point boric acid ester type synthetic brake fluid and preparation method thereof |
CN102363735B (en) * | 2010-12-14 | 2013-11-20 | 深圳车仆汽车用品发展有限公司 | Preparation method of alcohol ether boric acid ester type DOT4 braking fluid |
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CN109321342A (en) * | 2018-11-29 | 2019-02-12 | 杨红洲 | Motor vehicle brake fluid and preparation method thereof |
CN111303961A (en) * | 2020-04-03 | 2020-06-19 | 张家港迪克汽车化学品有限公司 | Recycled ester, preparation method thereof and application thereof in preparation of HZY3 brake fluid |
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- 2004-03-11 KR KR1020057016668A patent/KR20050107607A/en not_active Application Discontinuation
- 2004-03-11 WO PCT/EP2004/002552 patent/WO2004081155A1/en not_active Application Discontinuation
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- 2004-03-11 JP JP2006500058A patent/JP2006519887A/en active Pending
- 2004-03-11 BR BRPI0408234-6A patent/BRPI0408234A/en not_active IP Right Cessation
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- 2004-03-11 MX MXPA05009288A patent/MXPA05009288A/en unknown
- 2004-03-12 TW TW093106692A patent/TW200502379A/en unknown
- 2004-03-12 AR ARP040100818A patent/AR043582A1/en unknown
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Cited By (18)
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CN102618354A (en) * | 2012-03-08 | 2012-08-01 | 中国船舶重工集团公司第七一八研究所 | Method for preparing borate synthetic brake fluid |
RU2658917C2 (en) * | 2014-02-03 | 2018-06-26 | Фукс Петролюб Се | Additive compositions and industrial technical liquids |
WO2015116233A1 (en) * | 2014-02-03 | 2015-08-06 | Fuchs Petrolub Se | Additive compositions and industrial process fluids |
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US9587197B2 (en) | 2014-02-03 | 2017-03-07 | Fuchs Petrolub Se | Additive compositions and industrial process fluids |
US9593289B2 (en) * | 2014-02-25 | 2017-03-14 | Jon A. Petty | Corrosion inhibiting hydraulic fluid additive |
US10669503B2 (en) | 2014-02-25 | 2020-06-02 | Jon A. Petty | Corrosion inhibiting hydraulic fluid additive |
US9914105B2 (en) | 2014-11-07 | 2018-03-13 | Hyundai Motor Company | Phase-change suspension fluid composition including polyethylene oxide particles and method for manufacturing the same |
CN106753737A (en) * | 2016-11-29 | 2017-05-31 | 湘潭电机股份有限公司 | A kind of brake fluid and preparation method thereof |
WO2021213693A1 (en) | 2020-04-23 | 2021-10-28 | Clariant International Ltd | Low viscosity functional fluid composition |
EP3929269A1 (en) | 2020-06-22 | 2021-12-29 | Clariant International Ltd | Low viscosity functional fluid composition |
WO2021259514A1 (en) | 2020-06-22 | 2021-12-30 | Clariant International Ltd | Low viscosity functional fluid composition |
EP4056669A1 (en) | 2021-03-12 | 2022-09-14 | Clariant International Ltd | Low viscosity functional fluid composition |
WO2022189047A1 (en) | 2021-03-12 | 2022-09-15 | Clariant International Ltd | Low viscosity functional fluid composition |
EP4130211A1 (en) | 2021-08-02 | 2023-02-08 | Clariant International Ltd | Low viscosity functional fluid composition |
WO2023011801A1 (en) | 2021-08-02 | 2023-02-09 | Clariant International Ltd | Low viscosity functional fluid composition |
Also Published As
Publication number | Publication date |
---|---|
TW200502379A (en) | 2005-01-16 |
JP2006519887A (en) | 2006-08-31 |
AR043582A1 (en) | 2005-08-03 |
AU2004219905A1 (en) | 2004-09-23 |
EP1603996A1 (en) | 2005-12-14 |
DE10310757A1 (en) | 2004-09-23 |
MXPA05009288A (en) | 2005-10-05 |
BRPI0408234A (en) | 2006-03-01 |
NO20054265L (en) | 2005-09-15 |
KR20050107607A (en) | 2005-11-14 |
CA2517683A1 (en) | 2004-09-23 |
WO2004081155A1 (en) | 2004-09-23 |
CN1759165A (en) | 2006-04-12 |
ZA200507266B (en) | 2007-04-25 |
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