ATE160365T1 - Verfahren zur herstellung von polyurethanweichschäumen - Google Patents

Verfahren zur herstellung von polyurethanweichschäumen

Info

Publication number
ATE160365T1
ATE160365T1 AT91202197T AT91202197T ATE160365T1 AT E160365 T1 ATE160365 T1 AT E160365T1 AT 91202197 T AT91202197 T AT 91202197T AT 91202197 T AT91202197 T AT 91202197T AT E160365 T1 ATE160365 T1 AT E160365T1
Authority
AT
Austria
Prior art keywords
reaction mixture
polyurethane foam
weight
density
water
Prior art date
Application number
AT91202197T
Other languages
English (en)
Inventor
Lucien Jourquin
Prez Eddie Du
Rudi Mortelmans
Original Assignee
Recticel
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 Recticel filed Critical Recticel
Application granted granted Critical
Publication of ATE160365T1 publication Critical patent/ATE160365T1/de

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/30—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by mixing gases into liquid compositions or plastisols, e.g. frothing with air
    • 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
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3819—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen
    • C08G18/3823—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing -N-C=O groups
    • C08G18/3829—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing -N-C=O groups containing ureum 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
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4027—Mixtures of compounds of group C08G18/54 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
    • C08G18/28—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
    • C08G18/409—Dispersions of polymers of C08G in organic compounds having active hydrogen
    • 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
    • C08G18/63—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers
    • C08G18/632—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers onto polyethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • 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
    • C08G2110/0041—Foam properties having specified density
    • C08G2110/005—< 50kg/m3
    • 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
    • C08G2110/0041—Foam properties having specified density
    • C08G2110/0058—≥50 and <150kg/m3
    • 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
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
AT91202197T 1990-09-14 1991-08-29 Verfahren zur herstellung von polyurethanweichschäumen ATE160365T1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE9000877A BE1004588A3 (nl) 1990-09-14 1990-09-14 Werkwijze voor het vervaardigen van soepel polyurethaanschuim.

Publications (1)

Publication Number Publication Date
ATE160365T1 true ATE160365T1 (de) 1997-12-15

Family

ID=3884927

Family Applications (1)

Application Number Title Priority Date Filing Date
AT91202197T ATE160365T1 (de) 1990-09-14 1991-08-29 Verfahren zur herstellung von polyurethanweichschäumen

Country Status (7)

Country Link
US (1) US5194453A (de)
EP (1) EP0482682B1 (de)
JP (1) JPH04246430A (de)
AT (1) ATE160365T1 (de)
BE (1) BE1004588A3 (de)
CA (1) CA2049805A1 (de)
DE (1) DE69128233T2 (de)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3030106B2 (ja) * 1991-02-22 2000-04-10 三洋電機株式会社 低沸点発泡剤のミキシング装置
US5876134A (en) 1992-02-14 1999-03-02 The Gillette Company Foam grip
CA2107274C (en) * 1992-12-31 1998-11-03 Valeri L. Valoppi 1,1,1,2-tetrafluoroethane as a blowing agent in integral skin polyurethane shoe soles
BE1007076A3 (nl) * 1993-05-12 1995-03-07 Recticel Soepel vuurbestendig polyether-polyurethaanschuim en werkwijze ter bereiding daarvan.
CA2252796A1 (en) * 1996-05-15 1997-11-20 The Dow Chemical Company Mechanically frothed polyurethane foam prepared from a polyurethane formulation including an organo-metallic catalyst and a tertiary amine catalyst
US6372812B1 (en) 2001-02-20 2002-04-16 Foamex L.P. Higher support, lower density cushioning foams
US6861453B2 (en) 2001-03-16 2005-03-01 Hodogaya Chemical Co., Ltd. Process for producing a urethane-modified polyisocyanurate foam
FR2836470B1 (fr) * 2002-02-25 2004-07-09 J S O Matelassure en mousse de melanine et ses applications
AU2003251873A1 (en) * 2002-07-11 2004-02-02 Lendell Manufacturing, Inc. Antimicrobial polyurethane foam
US6740687B2 (en) * 2002-08-14 2004-05-25 Foamex L.P. Latex replacement polyurethane foams with improved flame retardancy
AU2003280707A1 (en) * 2002-11-06 2004-06-07 Daihachi Chemical Industry Co., Ltd. Composition for flame-retardant flexible polyurethane foam
JP2004169038A (ja) * 2002-11-06 2004-06-17 Kimimasa Asano ポリウレタン・ポリウレア系均一研磨シート材
US20040126556A1 (en) * 2002-12-27 2004-07-01 Nowak Michael T. Grip element
US7008973B2 (en) * 2003-01-14 2006-03-07 Pabu Services, Inc. Vacuum cooled foams
US6716890B1 (en) 2003-01-30 2004-04-06 Foamex L.P. Polyurethane foams with fine cell size
US20050038132A1 (en) * 2003-03-19 2005-02-17 Raghuram Gummaraju Composition for forming a foamed article and an article of furniture having the foamed article disposed therein
US6784218B1 (en) 2003-03-19 2004-08-31 Basf Corporation Method of forming high resilience slabstock polyurethane foam displaying latex-like characteristics
US6797736B1 (en) * 2003-03-19 2004-09-28 Basf Corporation Method of forming high resilience slabstock polyurethane foam
US7338983B2 (en) * 2004-02-10 2008-03-04 World Properties, Inc. Low density polyurethane foam, method of producing, and articles comprising the same
JP4378624B2 (ja) * 2004-02-10 2009-12-09 株式会社イノアックコーポレーション シール部材の製造方法
US20060029788A1 (en) * 2004-08-04 2006-02-09 Foamex L.P. Lower density, thermoformable, sound absorbing polyurethane foams
DE102006054197A1 (de) * 2006-11-15 2008-05-21 Henkel Kgaa Hochfeste Polyurethan-Klebstoffe
BRPI0813064A2 (pt) * 2007-08-01 2018-07-10 Dow Brasil Sudeste Ind Ltda "processo para produzir um laminado ou estrutura composta, laminado ou estrutura composta e artigo" processo para produzir um laminado ou estrutura composta, laminado ou estrutura composta e artigo
CN101842404B (zh) * 2007-08-27 2014-06-18 陶氏环球技术有限责任公司 具有铋化合物的基于天然油的柔性聚氨酯泡沫的催化剂
MX2010002620A (es) * 2007-09-07 2010-05-21 Dow Global Technologies Inc Uso de compuestos con base en aceite natural de baja funcionalidad para mejorar espumas.
CN101412798B (zh) 2008-11-21 2011-08-10 优洁（亚洲）有限公司 软质聚氨酯低回弹泡沫及其制备方法
US8901187B1 (en) 2008-12-19 2014-12-02 Hickory Springs Manufacturing Company High resilience flexible polyurethane foam using MDI
US8906975B1 (en) 2009-02-09 2014-12-09 Hickory Springs Manufacturing Company Conventional flexible polyurethane foam using MDI
JP4920051B2 (ja) * 2009-02-25 2012-04-18 株式会社日立製作所 酸素燃焼ボイラプラント及び酸素燃焼ボイラプラントの運転方法
GB0903717D0 (en) 2009-03-04 2009-04-15 Innochem Ltd Flexible polyurethane foam
ES2715193T3 (es) * 2010-11-03 2019-06-03 Dow Global Technologies Llc Sistemas de poliuretano con capacidad de autoaplastamiento
US9644066B2 (en) 2011-12-29 2017-05-09 Dow Global Technologies Llc Cyclic amine compounds, compositions, and polyurethane foams made therefrom
EP2724834A1 (de) 2012-10-23 2014-04-30 Latexco NV Verfahren und Vorrichtung zur Erzeugung eines Bettprodukts mit Latexschaumschicht, Platte einer solchen Latexschaumschicht zum Schneiden eines Bettprodukts sowie erzeugtes Bettprodukt
WO2015026567A1 (en) * 2013-08-23 2015-02-26 Dow Global Technologies Llc Textiles attached with low density polyurethane foams made using a combination of frothing and blowing methods
KR102360642B1 (ko) 2014-04-01 2022-02-09 다우 글로벌 테크놀로지스 엘엘씨 폴리우레탄 제품을 제조하기 위한 발포-겔 균형이 우수한 폴리에테르 폴리올
MX2017012405A (es) 2015-03-31 2018-01-18 Dow Global Technologies Llc Composiciones de polieter poliol.
PL3277740T3 (pl) 2015-03-31 2021-06-28 Dow Global Technologies Llc Formulacje pianki półelastycznej
US20180148535A1 (en) 2015-06-19 2018-05-31 Dow Global Technologies Llc Autocatalytic polyol useful for polyurethane foam manufacture
KR20190018471A (ko) 2016-06-13 2019-02-22 다우 글로벌 테크놀로지스 엘엘씨 자가촉매 폴리올
CN109689723B (zh) 2016-09-30 2022-04-29 陶氏环球技术有限责任公司 多元醇组合物
US20210230346A1 (en) * 2020-01-27 2021-07-29 Toyo Quality One Corporation Sound absorbing urethane foam
DE202020107477U1 (de) * 2020-12-22 2021-01-29 Va-Q-Tec Ag Isolationsbehälter zur Aufnahme von temperaturempfindlichen Produkten

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108976A (en) * 1960-06-10 1963-10-29 Du Pont Preparation of a cured polyurethane cellular material
BE777216A (fr) * 1971-01-12 1972-01-14 Continental Gummi Werke Ag Procede et dispositif de fabrication de blocs en matiere moussea surface plane dans des moules ouverts
US3836560A (en) * 1971-03-08 1974-09-17 Union Carbide Corp Organosilicone polymers
US3753933A (en) * 1972-04-24 1973-08-21 Dow Chemical Co Polyurethane foams from solid foaming agents
US3792073A (en) * 1972-05-10 1974-02-12 Union Carbide Corp Preparation of siloxaneoxyalkylene polymers
US3862879A (en) * 1973-03-12 1975-01-28 Dow Chemical Co Articles coated with air frothed polyurethane foams
DE2343294C3 (de) * 1973-08-28 1980-03-20 Bayer Ag, 5090 Leverkusen Verbundmaterialien und Verfahren zu ihrer Herstellung
US4008188A (en) * 1975-03-24 1977-02-15 Olin Corporation On-site generation of polyurethane foam
US4266042A (en) * 1977-08-22 1981-05-05 Henderson's Industries Limited Polyether-based polyurethane foams including a flame-retardant system containing antimony trioxide, a chlorinated paraffin and alumina trihydrate and method of preparation
EP0023749B1 (de) * 1979-07-02 1983-07-06 Imperial Chemical Industries Plc Verfahren und Apparat zur Herstellung von Artikeln aus flexiblem Polyurethanschaum
US4275172A (en) * 1980-01-28 1981-06-23 Union Carbide Corporation Frothable polyurethane composition and a cellular foam produced therefrom suitable for use in joints between wallboards
WO1982000297A1 (en) * 1980-07-15 1982-02-04 J Blackwell Production of synthetic plastics foam material
FR2548197B1 (fr) * 1983-06-15 1986-08-08 Desgranges Annie Procede de fabrication de mousses liquides de resines thermodurcissables, notamment de polyurethane, et mousses obtenues
US4514524A (en) * 1984-07-13 1985-04-30 Stauffer Chemical Company Intumescent flexible polyurethane foam
NZ222563A (en) * 1986-11-19 1990-08-28 Bp Chem Int Ltd Polyurethane froth foams
CA1290895C (en) * 1986-12-25 1991-10-15 Sadao Kumasaka Method and an apparatus for producing polyurethane foam
US5011908A (en) * 1988-07-12 1991-04-30 Arco Chemical Technology, Inc. Polymer polyol compositions and their use in the preparation of polyurethane foams
BE1002898A6 (nl) * 1989-03-03 1991-07-16 Recticel Polyisocyanuraatschuim of met polyurethaan gemodifieerd polyisocyanuraatschuim, alsook werkwijze voor het bereiden van dit schuim.

Also Published As

Publication number Publication date
EP0482682A1 (de) 1992-04-29
DE69128233T2 (de) 1998-04-16
US5194453A (en) 1993-03-16
DE69128233D1 (de) 1998-01-02
JPH04246430A (ja) 1992-09-02
BE1004588A3 (nl) 1992-12-15
EP0482682B1 (de) 1997-11-19
CA2049805A1 (en) 1992-03-15

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