KR101162394B1 - 저분자량 니트릴 고무의 제조 방법 - Google Patents
저분자량 니트릴 고무의 제조 방법 Download PDFInfo
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- KR101162394B1 KR101162394B1 KR1020067016809A KR20067016809A KR101162394B1 KR 101162394 B1 KR101162394 B1 KR 101162394B1 KR 1020067016809 A KR1020067016809 A KR 1020067016809A KR 20067016809 A KR20067016809 A KR 20067016809A KR 101162394 B1 KR101162394 B1 KR 101162394B1
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- KR
- South Korea
- Prior art keywords
- nitrile rubber
- molecular weight
- hydrogenation
- group
- carried out
- 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.)
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- 229920000459 Nitrile rubber Polymers 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000008569 process Effects 0.000 title claims description 16
- 238000002360 preparation method Methods 0.000 title description 4
- 229920000642 polymer Polymers 0.000 claims abstract description 34
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 25
- 150000001875 compounds Chemical class 0.000 claims abstract description 11
- 239000003054 catalyst Substances 0.000 claims description 34
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 14
- 150000002825 nitriles Chemical class 0.000 claims description 14
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 claims description 9
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 6
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 150000001450 anions Chemical class 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 125000004209 (C1-C8) alkyl group Chemical group 0.000 claims description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 229910052785 arsenic Inorganic materials 0.000 claims description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 125000003375 sulfoxide group Chemical group 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 239000002815 homogeneous catalyst Substances 0.000 claims 1
- 239000012442 inert solvent Substances 0.000 claims 1
- 150000008648 triflates Chemical class 0.000 claims 1
- 238000005649 metathesis reaction Methods 0.000 abstract description 23
- 238000009826 distribution Methods 0.000 abstract description 10
- 229910052707 ruthenium Inorganic materials 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 5
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical group [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052762 osmium Inorganic materials 0.000 abstract description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 abstract description 2
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- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010561 standard procedure Methods 0.000 abstract description 2
- VRBHURBJIHILRI-UHFFFAOYSA-N 1H-inden-1-ylidene Chemical group C1=CC=C2[C]C=CC2=C1 VRBHURBJIHILRI-UHFFFAOYSA-N 0.000 abstract 1
- 150000001993 dienes Chemical class 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
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- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical group C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 10
- 150000001336 alkenes Chemical class 0.000 description 9
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 8
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- 150000003003 phosphines Chemical class 0.000 description 6
- 239000005060 rubber Substances 0.000 description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical class C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 5
- 239000005977 Ethylene Chemical class 0.000 description 5
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- 239000004568 cement Substances 0.000 description 5
- 229910052750 molybdenum Inorganic materials 0.000 description 5
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- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 4
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- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- -1 amine salts Chemical class 0.000 description 4
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- QBERHIJABFXGRZ-UHFFFAOYSA-M rhodium;triphenylphosphane;chloride Chemical compound [Cl-].[Rh].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 QBERHIJABFXGRZ-UHFFFAOYSA-M 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 3
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- 150000001408 amides Chemical class 0.000 description 3
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- 238000011068 loading method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
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- 150000003839 salts Chemical class 0.000 description 3
- 150000003568 thioethers Chemical class 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- SDJHPPZKZZWAKF-UHFFFAOYSA-N 2,3-dimethylbuta-1,3-diene Chemical compound CC(=C)C(C)=C SDJHPPZKZZWAKF-UHFFFAOYSA-N 0.000 description 2
- 125000003860 C1-C20 alkoxy group Chemical group 0.000 description 2
- 125000003358 C2-C20 alkenyl group Chemical group 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 238000004566 IR spectroscopy Methods 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- 229930194542 Keto Natural products 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N Propene Chemical compound CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 238000010535 acyclic diene metathesis reaction Methods 0.000 description 2
- 125000003302 alkenyloxy group Chemical group 0.000 description 2
- 125000004183 alkoxy alkyl group Chemical group 0.000 description 2
- 125000004453 alkoxycarbonyl group Chemical group 0.000 description 2
- 125000005078 alkoxycarbonylalkyl group Chemical group 0.000 description 2
- 125000004390 alkyl sulfonyl group Chemical group 0.000 description 2
- 125000004414 alkyl thio group Chemical group 0.000 description 2
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- 125000004103 aminoalkyl group Chemical group 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- RBFQJDQYXXHULB-UHFFFAOYSA-N arsane Chemical class [AsH3] RBFQJDQYXXHULB-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 125000004104 aryloxy group Chemical group 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000007942 carboxylates Chemical class 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 150000002170 ethers Chemical class 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 150000002390 heteroarenes Chemical class 0.000 description 2
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 150000002466 imines Chemical class 0.000 description 2
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- 125000002950 monocyclic group Chemical group 0.000 description 2
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- YCWSUKQGVSGXJO-NTUHNPAUSA-N nifuroxazide Chemical group C1=CC(O)=CC=C1C(=O)N\N=C\C1=CC=C([N+]([O-])=O)O1 YCWSUKQGVSGXJO-NTUHNPAUSA-N 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 125000005538 phosphinite group Chemical group 0.000 description 2
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 2
- XRBCRPZXSCBRTK-UHFFFAOYSA-N phosphonous acid Chemical class OPO XRBCRPZXSCBRTK-UHFFFAOYSA-N 0.000 description 2
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 125000003367 polycyclic group Chemical group 0.000 description 2
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- WLPUWLXVBWGYMZ-UHFFFAOYSA-N tricyclohexylphosphine Chemical group C1CCCCC1P(C1CCCCC1)C1CCCCC1 WLPUWLXVBWGYMZ-UHFFFAOYSA-N 0.000 description 2
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
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- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
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- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- FCQRKDSALKMOGU-UHFFFAOYSA-K rhodium(3+);triphenylphosphane;trichloride Chemical compound Cl[Rh](Cl)Cl.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 FCQRKDSALKMOGU-UHFFFAOYSA-K 0.000 description 1
- YBCAZPLXEGKKFM-UHFFFAOYSA-K ruthenium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Ru+3] YBCAZPLXEGKKFM-UHFFFAOYSA-K 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-M triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-M 0.000 description 1
- 150000003658 tungsten compounds Chemical class 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
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-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/08—Depolymerisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/02—Hydrogenation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/42—Nitriles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with nitriles
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
실시예 1 | 실시예 2 | 테르반® A3407 (비교) |
|
Ru 촉매 로딩 (phr) | 0.035 | 0.016 | N/A |
온도 | 40℃ | 40℃ | N/A |
에틸렌 압력 | 400 psi | 400 psi | N/A |
최종 잔류 이중 결합 | < 1% | < 1% | < 1% |
최종 중합체 무니 (ML 1+4 @ 100℃) |
28.2 | 43.9 | 65 |
GPC | |||
Mn (kg/mol) | 64 | 83 | 97 |
Mw (kg/mol) | 150 | 237 | 314 |
PDI | 2.3 | 2.9 | 3.2 |
Claims (9)
- a) 트리시클로헥실포스핀-(η6-1-메틸-4-이소-프로필페닐)-2-페닐-인데닐리덴-루테늄 클로라이드의 트리플레이트 염의 존재 하에서 니트릴 고무를 반응시키는 단계; 및b) 수소화 니트릴 중합체의 경우, 단계 a)의 생성물을 수소화시키는 단계를 포함하는, 수소화될 수 있는 니트릴 고무의 제조 방법.
- 제1항에 있어서, 니트릴 고무가 수소화되고, 수소화가 균질 촉매 조건 하에서 실시되는 방법.
- 제2항에 있어서, 수소화가 동일계에서, 즉 단계 a)의 생성물의 우선 단리없이 수행되는 방법.
- 제1항 내지 제3항 중 어느 한 항에 있어서, 화합물 대 니트릴 고무의 중량비가 0.005 내지 5의 범위인 방법.
- 제1항 내지 제3항 중 어느 한 항에 있어서, 단계 a)가 추가로 하나 이상의 공올레핀의 존재 하에서 수행되는 방법.
- 제1항 내지 제3항 중 어느 한 항에 있어서, 모노클로로벤젠, 디클로로메탄, 벤젠, 톨루엔, 테트라히드로푸란 및 시클로헥산으로 이루어진 군으로부터 선택되는 불활성 용매 중에서 수행되는 방법.
- 제1항 내지 제3항 중 어느 한 항에 있어서, 니트릴 고무가 수소화되고, 수소화가 하기 화학식의 촉매를 사용하여 수행되는 방법.(R8 mB)lRhX3 n상기 식에서,각각의 R8은 C1-C8-알킬기, C4-C8-시클로알킬기, C6-C15-아릴기 및 C7-C15-아르알킬기로 이루어진 군으로부터 독립적으로 선택되고;B는 인, 비소, 황, 및 술폭시드기 (S=O)로 이루어진 군으로부터 선택되고;X3은 수소 및 음이온으로 이루어진 군으로부터 선택되고;l은 2, 3 또는 4이고, m은 2 또는 3이고, n은 1, 2 또는 3이다.
- 제7항에 있어서, 수소화 촉매가 (PPh3)3RhCl인 방법.
- 삭제
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2,462,011 | 2004-02-23 | ||
PCT/CA2005/000252 WO2005080455A1 (en) | 2004-02-23 | 2005-02-22 | Process for the preparation of low molecular weight nitrile rubber |
Publications (2)
Publication Number | Publication Date |
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KR20070032279A KR20070032279A (ko) | 2007-03-21 |
KR101162394B1 true KR101162394B1 (ko) | 2012-07-06 |
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KR1020067016809A Expired - Fee Related KR101162394B1 (ko) | 2004-02-23 | 2005-02-22 | 저분자량 니트릴 고무의 제조 방법 |
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Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6635768B1 (en) | 1998-04-06 | 2003-10-21 | Degussa Ag | Alkylidene complexes of ruthenium containing N-heterocyclic carbene ligands; use as highly active, selective catalysts for olefin metathesis |
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Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6635768B1 (en) | 1998-04-06 | 2003-10-21 | Degussa Ag | Alkylidene complexes of ruthenium containing N-heterocyclic carbene ligands; use as highly active, selective catalysts for olefin metathesis |
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