KR970061927A - 수-팽창 성형된 폴리우레탄 포옴의 경화를 촉진시키는 방법 및 조성물 - Google Patents

수-팽창 성형된 폴리우레탄 포옴의 경화를 촉진시키는 방법 및 조성물 Download PDF

Info

Publication number
KR970061927A
KR970061927A KR1019970005490A KR19970005490A KR970061927A KR 970061927 A KR970061927 A KR 970061927A KR 1019970005490 A KR1019970005490 A KR 1019970005490A KR 19970005490 A KR19970005490 A KR 19970005490A KR 970061927 A KR970061927 A KR 970061927A
Authority
KR
South Korea
Prior art keywords
catalyst
tripolymerization
alkali metal
tripolymer
methyl
Prior art date
Application number
KR1019970005490A
Other languages
English (en)
Inventor
가브리엘 페트렐라 로버트
조셉 코치 존
윌리엄 보드나 토마스
Original Assignee
윌리엄 에프. 마쉬
에어 프로덕츠 앤드 케미칼스, 인코오포레이티드
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 윌리엄 에프. 마쉬, 에어 프로덕츠 앤드 케미칼스, 인코오포레이티드 filed Critical 윌리엄 에프. 마쉬
Publication of KR970061927A publication Critical patent/KR970061927A/ko

Links

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
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4072—Mixtures of compounds of group C08G18/63 with other macromolecular compounds
    • 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
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • 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
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • 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
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C08G18/1833—Catalysts containing secondary or tertiary amines or salts thereof having ether, acetal, or orthoester 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
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C08G18/1875—Catalysts containing secondary or tertiary amines or salts thereof containing ammonium salts or mixtures of secondary of tertiary amines and acids
    • 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
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/22—Catalysts containing metal compounds
    • C08G18/225—Catalysts containing metal compounds of alkali or alkaline earth metals
    • 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
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/6552—Compounds of group C08G18/63
    • C08G18/6558—Compounds of group C08G18/63 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/657—Compounds of group C08G18/63 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of C08G18/3225 or C08G18/3271 or polyamines of C08G18/38
    • 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
    • C08G2110/00—Foam properties
    • C08G2110/0008—Foam properties flexible
    • 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
    • C08G2110/00—Foam properties
    • C08G2110/0083—Foam properties prepared using water as the sole blowing agent
    • 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
    • C08G2115/00—Oligomerisation
    • C08G2115/02—Oligomerisation to isocyanurate groups
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S521/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S521/902—Cellular polymer containing an isocyanurate structure

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

본 발명은 폴리올, 유기 폴리이소시아네이트, 우레탄 촉매 조성물 및 물을 포함하는 반응 혼합물을, pKa가1인 브뢴스테드산의 4급 암모늄염 또는 알칼리 금속 또는 알칼리 토금속염인 삼중합 촉매와 금형내에서 1단계에 반응시킨후 발포시키는 단계를 포함하는 수-팽창 성현된 가요성 폴리우레탄 포옴을 제조하는 방법에 관한 것으로서, 이 방법은 삼중합 촉매가 100g의폴리올당 약0.005 내지 0.04g 밀리당량의 양으로 존재하는 것을 특징으로 한다. 바람직한 삼중합 촉매는 N-(2-히드록시페닐)메틸 글리시네이트 알칼리 금속, 특히 N-(2-히드록시-5-노닐페닐)메틸-N-메틸 글리시네이트 알칼리 금속이다.

Description

수-팽창 성형된 폴리우레탄 포옴의 경화를 촉진시키는 방법 및 조성물
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음

Claims (20)

  1. 폴리올, 유기 폴링소시아네이트, 우레탄 촉매 조성물 및 물을 포함하는 반응 혼합물을 금형내에서 1단계로 반응시키고 발포키는 수-팽창된 셩형 가요성 폴리우레탄 포옴의 제조방법에 있어서, 반응 혼합물중의 이소시아네이트 삼중합 촉매가 100g의 폴리올당 약 0.005 내지 0.04g meq의 양으로존재하는 것을 특징으로 한는 방법.
  2. 제1항에 있어서, 삼중합 촉매가 pKa1인 브뢴스테드산의 알칼리 금속염 또는 알칼리 토금속염 또는 4급 암모늄염이고, 화함물은 (a) 25℃에서 100㎕의 물에 대해1g의 수용해도를 가진 무기 알칼리 토금속염, (b)알칼리 금속 디하이드로젠 인산염, (c) 알칼리 금속 황산염 및 (d) 알칼리 금속 또는 알칼리 토금속 수산화물 또는 알콕시드를 제외한 화합물인 방법.
  3. 제1항에 있어서, 삼중합 촉매가 알칼리 금소 카르복실레이트인 방법.
  4. 제3항에 있어서, 삼중합 촉매가 알칼리 금속 N-(2-히드록시페닐)메틸 글리시네이트인 방법.
  5. 제3항에 있어서, 삼중합 촉매가 알칼리 금속N-(2-히드록시-5-노닐페닐)메틸-N-메틸 글리시네이트인 방법.
  6. 제1항에 있어서, 삼중합 촉매가 4급 암모늄 카르복실레이트인 방법.
  7. 제6항에 있어서, 삼중합 촉매가 트리메틸-2-히드록시프로필암모늄 프로메이느; N-(2-히드록시프로필)트리에틸렌디아민-2-에틸헥사노에이트 및 디메틸-2-히드록시에틸-2-히드록시프로필암모늄 포르메이트로 구성된 군중에서 선택된 4급 암모늄 카르복실레이트인 방법.
  8. 제1항에 있어서, 삼중합 촉매가 반응 혼합물중에 100g의 폴리올당 약 0.006 내지 0.03g meq의 양으로 존재하는 방법.
  9. 폴리올; 유기 폴리이소시아네이트; 겔화 촉매 및 팽창 촉매를 포함하는 우레탄 촉매 조성물; 및 물을 포함하는 반응 혼합물을 금형내에서 1단계로 반응시키고발포시키는 수-팽창된 성형 가요성 폴리우레탄 포옴의 제조방법에 있어서, 반응 혼합물이 또한 100g의 폴리올당 약 0.006 내지 0.03g meq의 양으로존재하는 4급 암모늄 카르복실레이트 또는 알칼리 금속 카르복실레이트인 삼중합 촉매를 포함하는 것을 특징으로 하는 방법.
  10. 제9항에 있어서, 삼중합 촉매가 알칼리 금속 N-(2-히드록시페닐)메틸 글리시네이트인 방법.
  11. 제10항에 있어서, 삼중합 촉매가 알칼리 금속N-(2-히드록시-5-노닐페닐)메틸-N-메틸 글리시네이트인 방법.
  12. 제9항에있어서, 삼중합 촉매가 트리메틸-2-히드록시프로필암모늄 포르메이트; N-(2-히드록시프로필)트리에틸렌디아민-2-에틸헥사노에이트 및 디메틸-2-히드록시에틸-2 히드록시프로필암모늄 포르메이트로 구성된 군중에서 선택된 4급 암모늄 카르복실레이트인 방법.
  13. 제9항에 있어서, 삼중합 촉매가 100g의 폴리올당 약 0.008 내지 0.03g meq의 양으로 존재하는 방법.
  14. 제9항에 있어서, 우레탄 촉매 조성물이 겔화촉매인 트리에틸렌디아민 및 팽창촉매인 비스(디메틸아미노에틸)에테르 또는 펜타메틸디에틸렌트리아민을 포함하고, 삼중합 촉매는 100g의 폴리올당 약 0.008 내지 0.03g meq의 양으로 존재하는 방법.
  15. 제14항에 있어서, 삼중합 촉매가 알칼리 금속 N-(2-히드록시페닐)메틸 글리시테이트인 방법.
  16. 제15항에 있어서, 삼중합 촉매가 알칼리 금속 N-(2-히드록시-5-노닐페닐) 메틸-N-메틸 글리시네이트인 방법.
  17. 제14항에 있어서, 삼중합 촉매가 트리메틸-2-히드록시프로필암모늄 포르메이트; N-(2-히드록시프로필)트리에틸렌디아민-2-에틸헥사노에이트 및 디메틸-2-히드록시에틸-2-히드록시프로필암모늄 포르메이트로 구성된 군중에서 선택된 4급 암모늄 카르복실레이트인 방법.
  18. 92.5 내지 99.9중량%의 t-우레탄 촉매 및 0.1 내지 7.5중량%의 이소시아네이트 삼중합 촉매를 주성분을 하며, t-우레탄 촉매는 40 내지 60중량y의 겔화 촉매 및 40 내지 60중량y의 팽창 촉매를 주성분으로 하는 촉매 조성물.
  19. 제18항에 있어서, 겔화 촉매가 트리에틸렌디아민이고 팽창촉매는 비스(디메틸아미노에틸)에테르인 촉매 조성물.
  20. 제18항에 있어서, 94 내지 99.85중량%의 t-우레탄 촉매 및 0.15 내지 6중량%의 이소시아네이트 삼중합 촉매를 주성분으로 하는 촉매 조성물.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019970005490A 1996-02-29 1997-02-24 수-팽창 성형된 폴리우레탄 포옴의 경화를 촉진시키는 방법 및 조성물 KR970061927A (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60795596A 1996-02-29 1996-02-29
US08/607955 1996-02-29

Publications (1)

Publication Number Publication Date
KR970061927A true KR970061927A (ko) 1997-09-12

Family

ID=24434415

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019970005490A KR970061927A (ko) 1996-02-29 1997-02-24 수-팽창 성형된 폴리우레탄 포옴의 경화를 촉진시키는 방법 및 조성물

Country Status (3)

Country Link
US (1) US5844012A (ko)
KR (1) KR970061927A (ko)
BR (1) BR9701061A (ko)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100935517B1 (ko) * 2003-03-07 2010-01-06 엘지전자 주식회사 접착력과 탈형성이 개선된 폴리우레탄 발포체 제조를 위한원액 조성물, 이로부터 제조된 폴리우레탄 발포체 및 그제조방법
US20070282026A1 (en) * 2003-07-24 2007-12-06 Huntsman Petrochemical Corporation Low-Odor Catalyst for Isocyanate-Derived Foams and Elastomers
US20050267227A1 (en) * 2004-05-28 2005-12-01 Andrew Gary D Fast demold/extended cream time polyurethane formulations
US8258198B2 (en) * 2004-05-28 2012-09-04 Air Products And Chemicals, Inc. Fast demold/extended cream time polyurethane formulations
KR101486600B1 (ko) * 2006-08-11 2015-01-26 도소 가부시키가이샤 폴리우레탄 수지 제조용 촉매 조성물 및 폴리우레탄 수지의제조 방법
US20100179239A1 (en) * 2009-01-14 2010-07-15 Automotive Interior Consulting Method of minimizing compression set of foam
US9676896B2 (en) 2010-09-09 2017-06-13 Innovative Urethane, Llc Sugar-based polyurethanes, methods for their preparation, and methods of use thereof
US9725555B2 (en) * 2010-09-09 2017-08-08 Innovative Urethane, Llc Sugar-based polyurethanes, methods for their preparation, and methods of use thereof
US9166330B2 (en) 2010-10-26 2015-10-20 Tyco Electronics Services Gmbh Thermoplastic gel sealants
US10323116B2 (en) 2013-03-15 2019-06-18 Imperial Sugar Company Polyurethanes, polyurethane foams and methods for their manufacture
CN105992780B (zh) 2013-09-04 2019-10-25 G·德恩 吸收冲击能量的柔性聚氨酯和聚氨酯/聚有机硅氧烷泡沫材料
EP3458491A1 (en) * 2016-05-18 2019-03-27 Basf Se Process for preparing polyisocyanurate rigid foams
AU2019323594A1 (en) 2018-08-21 2021-02-11 Huntsman International Llc Catalyst for PIR/PUR foam production
EP3805285B1 (de) * 2019-10-08 2024-07-10 Evonik Operations GmbH Herstellung von polyurethanhartschaum
NL2025349B1 (en) * 2020-04-15 2021-10-26 Smart Mat Limited Method for the synthesis of an auxetic polyurethane foam with a defined cell structure and auxetic polyurethane foam obtainable by the method

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804782A (en) * 1972-06-19 1974-04-16 Basf Wyandotte Corp Flexible cellular polyurethane foam compositions having increased flame retardance
US3896052A (en) * 1974-01-30 1975-07-22 Upjohn Co Cocatalyst system for trimerizing polyisocyanates
US3903018A (en) * 1974-01-30 1975-09-02 Upjohn Co Novel cocatalyst system for trimerizing polyisocyanates
US4101465A (en) * 1976-10-06 1978-07-18 The Upjohn Company A cocatalyst system for trimerizing isocyanates
US4176218A (en) * 1977-10-17 1979-11-27 Basf Wyandotte Corporation High resilience flexible foamed polyurethanes, foamable mixtures and process therefor
US4686240A (en) * 1985-10-25 1987-08-11 Union Carbide Corporation Process for producing polyurethane foams using foam modifiers
US5086175A (en) * 1988-12-28 1992-02-04 Takeda Chemical Industries, Ltd. Polyisocyanates, their production and uses
US5252624A (en) * 1990-11-06 1993-10-12 Miles Inc. System for the production of toluene diisocyanate based flexible foams and the flexible foams produced therefrom
ZA945718B (en) * 1993-08-03 1995-03-09 Osi Specialties Inc Process for forming polyurethane foam using mechanical cooling and an additive

Also Published As

Publication number Publication date
US5844012A (en) 1998-12-01
BR9701061A (pt) 1998-08-25

Similar Documents

Publication Publication Date Title
KR970061927A (ko) 수-팽창 성형된 폴리우레탄 포옴의 경화를 촉진시키는 방법 및 조성물
ES2000915A6 (es) Procedimiento para preparar una espuma rigida de pliuretano
KR0141440B1 (ko) 폴리우레탄 폼을 제조하기 위한 제한된 활성 촉매로서의 4차 암모늄 카르복실레이트 분자내염 조성물
DE68909870D1 (de) Weiche flexible Polyurethanschaumstoffe, Verfahren zu deren Herstellung sowie in diesem Verfahren verwendbare Polyolzusammensetzung.
CA2360114A1 (en) Foamed thermoplastic polyurethanes
EP0254097A3 (en) Catalyst mixtures for polyisocyanurate foam
AR010541A1 (es) Composicion de isocianato-reactivo; proceso para elaborar espumas rigidas de poliuretano o poliisocianurato de uretano-modificado y las espumas rigidasde poliuretano o poliisocianurato de uretano-modificado obtenidas
BR9809930B1 (pt) processo para a preparaÇço de espumas rÍgidas de poliuretano de cÉlulas fechadas com baixa condutibilidade tÉrmica a partir de poliàis e poliisocianatos, bem como de agentes de esponjamento e, eventualmente, de auxiliares de esponjamento.
BR9404764A (pt) Processo para preparaçao de espuma de poliuretano
KR940007087A (ko) 반응 사출 성형(rim)된 에너지 흡수성 폴리우레탄 발포체
KR950014167A (ko) Cfc를 사용하지 않는 기포 폴리우레탄 성형품의 제조 방법
WO2003042268A1 (fr) Procede de production de mousse a base de resine synthetique
DE69911937D1 (de) Faserverstärkte durch strukturellen Reaktionsspritzguss hergestellte Polyisocyanurat Schäume
DK200401639A (da) Fleksibelt polyurethanskum
NZ235259A (en) Method for preparing isocyanate foams using cyclic carbonates as blowing agents
TW200610780A (en) Process for making polyurethane and polyisocyanurate foams using mixtures of a hydrofluorocarbon and methyl formate as a blowing agent
US5155142A (en) Process for preparing polyurea or polyurethane/urea foams
AU4560300A (en) Polymer-modified polyols, their use for the manufacture of polyurethane products
US4431753A (en) Catalyst blend containing 1,2-dimethylimidazole
EP0293060A3 (en) Rigid polyurethane foam and process for producing the same
KR940014484A (ko) 감소된 밀도를 갖으며, 물 팽창된 디페닐메탄 디이소시아 네이트계 폴리우레탄 포옴을 제조하는 방법
ES453247A1 (es) Un procedimiento para efectuar simultaneamente la trimeriza-cion de poliisocianato y la formacion de una espuma rigida de poliuretano.
DE3877424D1 (de) Verfahren zur herstellung harter polyurethanschaeume.
JPH02124918A (ja) 自動車内外装材用硬質ウレタンフオームの製造方法
GB2062660A (en) Method of recovering and reproducing raw materials from polyurethanes

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application