KR0184586B1 - 탄성중합체성 폴리우레탄 또는 폴리우레탄-우레아 중합체의 제조방법 및 이와 같이 제조된 폴리우레탄 - Google Patents
탄성중합체성 폴리우레탄 또는 폴리우레탄-우레아 중합체의 제조방법 및 이와 같이 제조된 폴리우레탄 Download PDFInfo
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- KR0184586B1 KR0184586B1 KR1019910701874A KR910701874A KR0184586B1 KR 0184586 B1 KR0184586 B1 KR 0184586B1 KR 1019910701874 A KR1019910701874 A KR 1019910701874A KR 910701874 A KR910701874 A KR 910701874A KR 0184586 B1 KR0184586 B1 KR 0184586B1
- Authority
- KR
- South Korea
- Prior art keywords
- propylene oxide
- poly
- weight
- prepolymer
- polymer
- Prior art date
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- 239000000806 elastomer Substances 0.000 claims abstract description 68
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- 239000004413 injection moulding compound Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- RCZLVPFECJNLMZ-UHFFFAOYSA-N n,n,n',n'-tetraethylpropane-1,3-diamine Chemical compound CCN(CC)CCCN(CC)CC RCZLVPFECJNLMZ-UHFFFAOYSA-N 0.000 description 1
- XFLSMWXCZBIXLV-UHFFFAOYSA-N n,n-dimethyl-2-(4-methylpiperazin-1-yl)ethanamine Chemical compound CN(C)CCN1CCN(C)CC1 XFLSMWXCZBIXLV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000005474 octanoate group Chemical group 0.000 description 1
- KGCNHWXDPDPSBV-UHFFFAOYSA-N p-nitrobenzyl chloride Chemical compound [O-][N+](=O)C1=CC=C(CCl)C=C1 KGCNHWXDPDPSBV-UHFFFAOYSA-N 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 150000004986 phenylenediamines Chemical class 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000011417 postcuring Methods 0.000 description 1
- NHDHVHZZCFYRSB-UHFFFAOYSA-N pyriproxyfen Chemical compound C=1C=CC=NC=1OC(C)COC(C=C1)=CC=C1OC1=CC=CC=C1 NHDHVHZZCFYRSB-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000006268 reductive amination reaction Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 238000005829 trimerization reaction Methods 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 150000003673 urethanes Chemical class 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
- C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
- C08G18/4841—Polyethers containing oxyethylene units and other oxyalkylene units containing oxyethylene end groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4866—Polyethers having a low unsaturation value
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/50—Polyethers having heteroatoms other than oxygen
- C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
- C08G18/5024—Polyethers having heteroatoms other than oxygen having nitrogen containing primary and/or secondary amino groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2120/00—Compositions for reaction injection moulding processes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2380/00—Tyres
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
Description
Claims (12)
- 폴리이소시아네이트를 1000 내지 5000 당량의 물질을 포함하는 이소시아네이트-반응성 조성물과 반응시키며, 이때 1000 내지 5000 당량의 물질의 주요 부분이 공칭적으로 분자당 2개 이상의 이소시아네이트-반응성 그룹을 갖는 폴리(프로필렌 옥사이드)중합체 또는 이의 혼합물이며, 당해 폴리(프로필렌 옥사이드)중합체 또는 이의 혼합물은 1g당 약 0.04 밀리당량(meq/g) 이하의 일작용성 불순물을 가짐을 특징으로 하여, 폴리우레탄 및/또는 폴리우레아 탄성중합체를 제조하는 방법.
- 제1항에 있어서 폴리(프로필렌 옥사이드)중합체가 아민 질소원자를 함유하지 않는 개시제 화합물의 존재하에서 프로필렌 옥사이드 또는 프로필렌 옥사이드와 하나 이상의 다른 알킬렌 옥사이드와의 혼합물인 반응 생성물인 방법.
- 제2항에 있어서, 이소시아네이트-반응성 조성물이 연쇄연장제를 추가로 포함하는 방법.
- 제2항에 있어서, 당량이 1000 내지 5000인 물질 15중량% 이상을 제1단계에서 폴리이소시아네이트와 반응시켜 예비중합체 또는 유사-예비중합체를 형성시키고, 당해 예비중합체 또는 유사-예비중합체를 제2 단계에서 연쇄연장제 및 당량이 1000 내지 5000인 물질의 잔량을 포함하는 이소시아네이트-반응성 물질과 반응시키는 방법.
- 제1항 내지 제4항중 어느 한 항에 있어서, 폴리(프로필렌 옥사이드)중합체가 20중량% 이하의 에틸렌 옥사이드로 말단-캡핑된 프로필렌 옥사이드의 중합체이고, 공칭 작용가가 2 내지 3이고 당량이 1300 내지 2500인 방법.
- 제1항 내지 제4항중 어느 한 항에 있어서, 탄성중합체의 밀도가 약 800kg/m3이상인 방법.
- 제1항 내지 제4항중 어느 한 항에 있어서, 이소시아네이트-반응성 조성물이 (1)폴리(프로필렌 옥사이드)의 약 20중량% 이하를 구성하는 말단 에틸렌 옥사이드 캡핑을 갖는 당량이 1300 내지 2500인 하이드록실-말단화되고, 공칭적으로 이작용성 또는 삼작용성인 폴리(프로필렌 옥사이드) 중합체 및 디에틸톨루엔 디아민 또는 다른 입체 장애 방향족 디아민 연쇄연장제의 혼합물; (2) 폴리(프로필렌 옥사이드) 중량의 약 20중량% 이하를 구성하는 말단 에틸렌 옥사이드 캡핑을 갖고, 당량이 1300 내지 2500인 하이드록실-말단화되고 공칭적으로 이작용성 또는 삼작용성인 폴리(프로필렌 옥사이드)중합체, 하이드록실-말단화된 폴리(프로필렌 옥사이드)중합체의 중량을 기준으로 하여 동일한 양이하의 공칭적으로 이작용성 또는 삼작용성인 분자량이 150 내지 6000인 아민화된 폴리에테르, 및 디에틸 톨루엔디아민 또는 다른 입체 장애 방향족 디아민 연쇄연장제의 혼합물, 및 (3) 당량이 1300 내지 2500인 아민 및/또는 이민-말단화된 공칭적으로 이작용성 또는 삼작용성인 폴리(프로필렌 옥사이드) 중합체와 디에틸톨루엔디아민 또는 다른 입체장애 방향족 디아민 연쇄연장체의 혼합물로 이루어진 그룹중에서 선택되는 방법.
- 제3항 또는 제4항에 있어서, 연쇄연장제가 방향족 디아민인 방법.
- 제3항 또는 제4항에 있어서, 반응 사출 형성 공정인 방법.
- 제4항에 있어서, 주형 공정인 방법.
- 제10항에 있어서, 예비중합체 또는 유사-예비중합체가 NCO인 그룹 0.5 내지 25중량%를 함유하는 방법.
- 제4항에 있어서, 예비중합체 또는 유사-예비중합체가 NCO 함량이 8 내지 80중량%인 MDI 유사 예비중합체인 방법.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US36728089A | 1989-06-16 | 1989-06-16 | |
US367280 | 1989-06-16 | ||
PCT/US1990/003264 WO1990015835A1 (en) | 1989-06-16 | 1990-06-08 | Process for preparing elastomeric polyurethane or polyurethane-urea polymers, and polyurethanes so prepared |
Publications (2)
Publication Number | Publication Date |
---|---|
KR920702698A KR920702698A (ko) | 1992-10-06 |
KR0184586B1 true KR0184586B1 (ko) | 1999-05-15 |
Family
ID=23446553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019910701874A KR0184586B1 (ko) | 1989-06-16 | 1990-06-08 | 탄성중합체성 폴리우레탄 또는 폴리우레탄-우레아 중합체의 제조방법 및 이와 같이 제조된 폴리우레탄 |
Country Status (13)
Country | Link |
---|---|
EP (1) | EP0408201B1 (ko) |
JP (1) | JPH04506226A (ko) |
KR (1) | KR0184586B1 (ko) |
AR (1) | AR244723A1 (ko) |
AT (1) | ATE124430T1 (ko) |
AU (1) | AU640673B2 (ko) |
BR (1) | BR9007432A (ko) |
CA (1) | CA2019060C (ko) |
DE (1) | DE69020446T2 (ko) |
ES (1) | ES2073528T3 (ko) |
MX (1) | MX174479B (ko) |
NZ (1) | NZ234036A (ko) |
WO (1) | WO1990015835A1 (ko) |
Cited By (1)
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KR101686774B1 (ko) * | 2016-08-30 | 2016-12-15 | 전정희 | 물성이 개선된 ppdi계 폴리우레탄 탄성체 제조방법 및 이에 의해 제조된 ppdi계 폴리우레탄 탄성체 |
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US5010117A (en) * | 1989-06-16 | 1991-04-23 | Dow Chemical Company | Flexible polyurethane foams prepared using low unsaturation polyether polyols |
US5136010A (en) * | 1990-09-28 | 1992-08-04 | Olin Corporation | Polyurethane elastomers and polyurea elastomers made using high functionality, low unsaturation level polyols prepared with double metal cyanide catalysts |
US5096993A (en) * | 1990-11-02 | 1992-03-17 | Olin Corporation | Thermoplastic polyurethane elastomers and polyurea elastomers made using low unsaturation level polyols prepared with double metal cyanide catalysts |
US5185420A (en) * | 1990-11-02 | 1993-02-09 | Olin Corporation | Thermoplastic polyurethane elastomers and polyurea elastomers made using low unsaturation level polyols prepared with double metal cyanide catalysts |
US5231159A (en) * | 1990-12-27 | 1993-07-27 | The Gates Rubber Company | High temperature resistant molded elastomer |
EP0517883B1 (en) * | 1990-12-27 | 1996-09-25 | The Gates Rubber Company | High temperature polyurethane belt |
DE4203215A1 (de) * | 1992-02-05 | 1993-08-12 | Bayer Ag | Verfahren zur herstellung von formkoerpern |
CA2095876A1 (en) * | 1992-06-05 | 1993-12-06 | Nigel Barksby | Isocyante-terminated prepolymers derived from polyether polyol mixtures having low monol content and their use in polyurethanes |
ES2098710T3 (es) * | 1992-07-30 | 1997-05-01 | Ciba Geigy | Composicion de endurecedor para obtener articulos moldeados de poliuretano. |
GB9312256D0 (en) * | 1993-06-15 | 1993-07-28 | Ici Plc | Novel polyols |
EP0677543B2 (en) * | 1994-04-12 | 2006-11-15 | Mitsui Chemicals, Inc. | Preparation of polyoxyalkylene polyols, polymer polyols and flexible polyurethane foams |
WO1996041829A2 (en) * | 1995-06-12 | 1996-12-27 | Huntsman Petrochemical Corporation | Process for preparing low unsaturation polyether polyols |
CA2174394A1 (en) * | 1995-06-12 | 1996-12-13 | Timothy L. Lambert | Process for preparing low unsaturation polyether polyols |
US5677413A (en) * | 1995-06-15 | 1997-10-14 | Arco Chemical Technology, L.P. | Polyurethane elastomers exhibiting improved demold green strength and water absorption and haze-free polyols suitable for their preparation |
WO1998015590A1 (en) * | 1996-06-11 | 1998-04-16 | Huntsman Petrochemical Corporation | Process for preparing low unsaturation polyether polyols |
WO1998016568A1 (en) * | 1996-10-11 | 1998-04-23 | Arco Chemical Technology, L.P. | Improved spandex elastomers |
ATE350209T1 (de) * | 1999-12-13 | 2007-01-15 | Dow Global Technologies Inc | Leichtgewicht-reifenstützkörper, zusammensetzung dafür und herstellungsverfahren |
EP1318921B1 (en) | 2000-09-11 | 2004-12-01 | Dow Global Technologies Inc. | Method and device for preparing a tire support |
AU2002225858A1 (en) | 2000-12-19 | 2002-07-01 | Dow Global Technologies Inc. | Thermoplastic polyurethane containing structural units of ethylene oxide polyol or ethylene oxide capped propylene oxide polyol |
WO2007052697A1 (ja) * | 2005-11-02 | 2007-05-10 | Mitsubishi Chemical Corporation | ポリアルキレンエーテルグリコール及びその製造方法 |
CN101077904B (zh) * | 2006-05-25 | 2010-08-04 | 远东新世纪股份有限公司 | 热塑性聚氨酯及其使用 |
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US3829505A (en) * | 1970-02-24 | 1974-08-13 | Gen Tire & Rubber Co | Polyethers and method for making the same |
JPS5765718A (en) * | 1980-10-07 | 1982-04-21 | Asahi Glass Co Ltd | Production of thermoplastic polyurethane |
US4326047A (en) * | 1980-11-06 | 1982-04-20 | The Dow Chemical Company | Process for reacting alkylene oxides with hydroxyl-containing initiator compounds |
DE3142041C2 (de) * | 1981-10-23 | 1983-09-15 | Th. Goldschmidt Ag, 4300 Essen | Verfahren zur Herstellung von Polyoxyalkylenethern |
US4687851A (en) * | 1985-08-15 | 1987-08-18 | The Dow Chemical Company | Polyurethane elastomers prepared from high equivalent weight polyahls |
US4764567A (en) * | 1986-11-20 | 1988-08-16 | Basf Corporation | Process for the preparation of polyoxyalkylene block polyethers having enhanced properties |
DE68926107T3 (de) * | 1988-10-25 | 2005-07-07 | Asahi Glass Co., Ltd. | Elastischer polyurethanschaum und verfahren zur herstellung |
AR243911A1 (es) * | 1988-11-18 | 1993-09-30 | Dow Chemical Co | Un proceso para la preparacion de un poliol que tiene un peso equivalente de 200 a 4000 mediante la reaccion de un compuesto monoepoxi. |
JPH02155913A (ja) * | 1988-12-09 | 1990-06-15 | Asahi Glass Co Ltd | 反応射出成形方法 |
JPH02263818A (ja) * | 1989-04-04 | 1990-10-26 | Asahi Glass Co Ltd | 新規なポリウレタンエラストマー |
JPH02263819A (ja) * | 1989-04-04 | 1990-10-26 | Asahi Glass Co Ltd | ポリウレタンエラストマー |
JPH02283712A (ja) * | 1989-04-25 | 1990-11-21 | Asahi Glass Co Ltd | ポリウレタン系エラストマーおよびその製造法 |
JPH02296816A (ja) * | 1989-05-12 | 1990-12-07 | Asahi Glass Co Ltd | 反応射出成形方法 |
JPH02296817A (ja) * | 1989-05-12 | 1990-12-07 | Asahi Glass Co Ltd | 反応射出成形法 |
US5010117A (en) * | 1989-06-16 | 1991-04-23 | Dow Chemical Company | Flexible polyurethane foams prepared using low unsaturation polyether polyols |
-
1990
- 1990-06-08 WO PCT/US1990/003264 patent/WO1990015835A1/en unknown
- 1990-06-08 AU AU59527/90A patent/AU640673B2/en not_active Ceased
- 1990-06-08 BR BR909007432A patent/BR9007432A/pt not_active IP Right Cessation
- 1990-06-08 KR KR1019910701874A patent/KR0184586B1/ko not_active IP Right Cessation
- 1990-06-08 JP JP2509542A patent/JPH04506226A/ja active Pending
- 1990-06-12 NZ NZ234036A patent/NZ234036A/xx unknown
- 1990-06-15 MX MX021190A patent/MX174479B/es unknown
- 1990-06-15 AT AT90306585T patent/ATE124430T1/de not_active IP Right Cessation
- 1990-06-15 CA CA002019060A patent/CA2019060C/en not_active Expired - Fee Related
- 1990-06-15 EP EP90306585A patent/EP0408201B1/en not_active Expired - Lifetime
- 1990-06-15 ES ES90306585T patent/ES2073528T3/es not_active Expired - Lifetime
- 1990-06-15 AR AR90317129A patent/AR244723A1/es active
- 1990-06-15 DE DE69020446T patent/DE69020446T2/de not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101686774B1 (ko) * | 2016-08-30 | 2016-12-15 | 전정희 | 물성이 개선된 ppdi계 폴리우레탄 탄성체 제조방법 및 이에 의해 제조된 ppdi계 폴리우레탄 탄성체 |
Also Published As
Publication number | Publication date |
---|---|
CA2019060C (en) | 2002-11-12 |
KR920702698A (ko) | 1992-10-06 |
MX174479B (es) | 1994-05-18 |
AR244723A1 (es) | 1993-11-30 |
BR9007432A (pt) | 1992-07-21 |
AU5952790A (en) | 1991-01-08 |
EP0408201B1 (en) | 1995-06-28 |
NZ234036A (en) | 1993-09-27 |
DE69020446T2 (de) | 1995-11-23 |
ES2073528T3 (es) | 1995-08-16 |
AU640673B2 (en) | 1993-09-02 |
DE69020446D1 (de) | 1995-08-03 |
CA2019060A1 (en) | 1990-12-16 |
JPH04506226A (ja) | 1992-10-29 |
EP0408201A1 (en) | 1991-01-16 |
ATE124430T1 (de) | 1995-07-15 |
WO1990015835A1 (en) | 1990-12-27 |
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