[go: up one dir, main page]

WO1996006874A1 - Mousse souple de polyurethanne de densite reduite produite a partir de diphenylisocyanate de methylene - Google Patents

Mousse souple de polyurethanne de densite reduite produite a partir de diphenylisocyanate de methylene Download PDF

Info

Publication number
WO1996006874A1
WO1996006874A1 PCT/US1995/010717 US9510717W WO9606874A1 WO 1996006874 A1 WO1996006874 A1 WO 1996006874A1 US 9510717 W US9510717 W US 9510717W WO 9606874 A1 WO9606874 A1 WO 9606874A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
polyahl
content
oxyethylene
percent
Prior art date
Application number
PCT/US1995/010717
Other languages
English (en)
Inventor
Henri L. S. A. Mispreuve
Original Assignee
The Dow Chemical Company
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 The Dow Chemical Company filed Critical The Dow Chemical Company
Priority to AU34131/95A priority Critical patent/AU3413195A/en
Publication of WO1996006874A1 publication Critical patent/WO1996006874A1/fr

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/2805Compounds having only one group containing active hydrogen
    • C08G18/2815Monohydroxy compounds
    • C08G18/283Compounds containing ether groups, e.g. oxyalkylated monohydroxy compounds
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00Foam properties
    • C08G2110/0008Foam properties flexible
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00Foam properties
    • C08G2110/0041Foam properties having specified density
    • C08G2110/005< 50kg/m3
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00Foam properties
    • C08G2110/0041Foam properties having specified density
    • C08G2110/0058≥50 and <150kg/m3
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00Foam properties
    • C08G2110/0083Foam properties prepared using water as the sole blowing agent

Definitions

  • This invention relates to the preparation of a water-blown, methylene diphenylisocyanate-based (MDI) polyurethane foam, and particularly a flexible, slabstock polyurethane foam.
  • MDI methylene diphenylisocyanate-based
  • Polyurethane foam manufacturers frequently desire, for economic reasons, to prepare foam having a lower density without detriment to competitive physical properties.
  • An obvious means of attaining a lower density foam is to increase the amount of blowing agent o present during the manufacturing process when reacting a polyisocyanate with a polyether or polyester polyol.
  • volatile organic compounds such as, for example, trichlorof luoromethane or methylene chloride have been employed as "physical" blowing agents when preparing flexible polyurethane foam.
  • the use of many physical blowing agents has largely ceased 5 with only water being used in preference as a "chemical" blowing means. Water reacts with the polyisocyanate generating in situ carbon dioxide which then functions as the blowing agent.
  • this invention relates to a process for preparing a flexible polyurethane foam which comprises reacting a polyisocyanate with a polyahl in the presence of a processing aid and water, wherein: a) the polyisocyanate comprises a methylene diphenylisocyanate, or a modified methylene diphenylisocyanate having an isocyanate content of at least 18 weight percent; b) the polyahl comprises at least one polyoxypropylene-oxyethylene polyol containing at least two hydroxyl groups, said polyahl having an average equivalent weight of from 1600 to 5000, an average oxyethylene content of at least 10 weight percent based on its total weight, and an average primary hydroxyl content of at least 55 percent of its total hydroxyl content; and c) the processing aid comprises at least one monohydroxyl polyether having an equivalent weight of from 600 to 5000 and an oxyethylene content of from 25 to 75 weight percent, and wherein the processing aid is present in an amount of from 1 to 20 parts
  • this invention relates to a flexible polyurethane foam obtained according to the above-defined process.
  • this invention relates to an isocyanate-reactive composition suitable for preparing a flexible polyurethane foam which contains a polyahl, a processing aid, and water wherein:
  • the polyahl comprising a polyoxyalkylene polyol, has at least two isocyanate- -reactive hydrogen atoms/molecule, an average equivalent weight of from 1600 to 5000, an average oxyethylene content of at least 10 weight percent based on its total weight, and an average primary hydroxyl content of at least 55 percent of its total hydroxyl content;
  • the processing aid comprising one or more monohydroxyl polyethers having an equivalent weight of from 600 to 5000 and an oxyethylene content of from 25 to 75 weight percent, is present in an amount of from 1 to 20 parts per 100 parts by weight of (a);
  • MDI metal-based polyurethane foam
  • a flexible slabstock polyurethane foam exhibiting attractive load bearing properties and a reduced density.
  • reduced density it is understood that the foam has a lower density in comparison to foam obtained from conventional art processes using the same amounts of blowing agents providing the same blowing potential.
  • the free rise density of such foam typically is from 15 to 60 kg/m 3 , and preferably from 20 to 45 kg/m 3 .
  • the load bearing properties of the foam may be characterized by a modulus or "SAG" factor performance generally of 2.5 or higher, and frequently of 3.0 or higher.
  • such polyurethane foam can be prepared by reacting a polyisocyanate with a polyahl in the presence of a processing aid and water, and optionally catalyst, surfactant, flame retardant and other additives well known to those skilled in the art of preparing polyurethane foam.
  • a processing aid and water and optionally catalyst, surfactant, flame retardant and other additives well known to those skilled in the art of preparing polyurethane foam.
  • catalyst, surfactant, flame retardant and other additives well known to those skilled in the art of preparing polyurethane foam.
  • the polyisocyanate used in the present invention comprises a methylene diphenylisocyanate (MDI) or a urethane-modified adduct thereof having an isocyanate content of at least 18 weight percent.
  • MDI methylene diphenylisocyanate
  • urethane-modified adduct thereof having an isocyanate content of at least 18 weight percent.
  • MDI includes the isomers 4,4'- and 2,4'-methylene diphenylisocyanate in a weight ratio of advantageously from 98:2 to 50: 50, preferably from 95:5 to 70:30, and more preferably from 90: 10 to 70:30. Such a ratio is desirable to provide optimum physical properties including the SAG factor of the resulting foam. While it is preferred to use a polyisocyanate that consists essentially of 4,4'- and 2,4'-MDI isomers, such MDI isomers may also be used in admixture with polymeric polymethylene polyphenylisocyanate. When present, the amount of polymeric polymethylene polyphenylisocyanate in the total polyisocyanate mixture will be less than 30, and preferably less than 15 percent based on parts by weight of total polyisocyanate present.
  • the urethane-modified adduct of MDI is obtained by reacting MDI with a polyoxyalkylene diol or triol, present in a substoichiometric amount, to provide the resulting adduct with an isocyanate content advantageously of from 20, preferably from 25, more preferably from 28, and preferably to 31, more preferably to 30 weight percent.
  • Suitable and preferred urethane-modified polyisocyanates are disclosed in U.S. Patent 5,114,989 and exemplified by, for example, the urethane-modified polyisocyanate designated as ISONATE Ml 00 available from The Dow Chemical Company.
  • the polyisocyanate is present in an amount sufficient to provide an isocyanate reaction index of typically from 50 to 90, preferably from 65, more preferably from 70, and preferably up to 85.
  • An isocyanate reaction index of 100 corresponds to one isocyanate group per isocyanate reactive hydrogen atom including those present from the polyahl, processing aid and water.
  • the Polyahl comprises at least one polyoxypropylene-oxyethylene polyol containing two or more hydroxyl groups, and preferably comprises at least two different polyoxypropylene-oxyethylene polyols.
  • the polyahl can additionally include a variety of compounds and substances containing isocyanate-reactive hydrogen atoms such as amines, thiols, carboxylic acids and polyester polyols.
  • the polyahl is characterized by its average equivalent weight, average oxyethylene content and average primary hydroxyl content. In general, the polyahl has an average equivalent weight of from 1600 to 5000, preferably from 1650, more preferably from 1700, preferably to 4000, more preferably to 3000.
  • the polyahl has an average oxyethylene content of at least 10, preferably from 12, and more preferably from 14, preferably to 50, more preferably to 40, and most preferably to 30 percent based on its total weight.
  • the oxyethylene content of the polyahl is understood to provide a good compatibility with water as present in the process of the invention.
  • the polyahl has an average primary hydroxyl content of at least 55, preferably at least 60, more preferably at least 65 percent; preferably to 90, and more preferably to 85 percent of its total hydroxyl content.
  • the polyahl advantageously has an average functionality of at least 2, preferably from 2.25 to 6, and more preferably from 2.25 to 4, and yet more preferably to 3.5.
  • the term "functionality" is intended to mean the average number of isocyanate-reactive hydrogen atoms/molecule.
  • the polyahl comprises at least one polyoxypropylene-oxyethylene polyol.
  • Such polyol can be defined by the above-mentioned equivalent weight, oxyethylene content and primary hydroxyl percentage.
  • the polyahl comprises a mixture of (i) a first polyoxyalkylene-oxyethylene polyol and (ii) a second polyoxyalkylene-oxyethylene polyol.
  • a mixture advantageously, based on total weight of polyol (i) and polyol (ii) present, contains polyol (i) in an amount of from 60 to 98, preferably from 70 to 98, more o pre erably from 80 to 98, and most preferably from 80 to 95 weight percent; and polyol (ii) in an amount of from 2 to 40, preferably from 2 to 30, more preferably from 2 to 20, and most preferably from 5 to 15 weight percent.
  • polyol (i) is as described above but limited to an oxyethylene content of less than 50, preferably from 10 to 40 weight percent; and advantageously has a functionality of from 2 to 6, preferably from 2 to 4.
  • Polyol (ii) is 5 distinguished from polyol (i) in that it has an oxyethylene content of more than 50, preferably at least 60, and preferably up to 100, more preferably up to 85 weight percent; and an equivalent weight of from 500 to 5000, preferably from 1000 to 3000.
  • Polyol (ii) advantageously has a functionality of from 2 to 6, preferably from 2 to 4.
  • Suitable polyoxyalkylene polyols which may constitute the polyahl include those 0 which can be obtained by reacting an initiator containing two or more active hydrogen atoms with alkylene oxides comprising ethylene oxide, preferably in combination with propylene oxide or butylene oxide.
  • Typical initiators include water, alkylene glycols, glycerine, trimethylolpropane, pentaerythritol, methylglucoside, sorbitol, mannitol, and sucrose.
  • initiators include organic amines such as ethylene 5 diamine and toluene diamine; alkanolamines such as mono- or diethanolamine or diisopropanolamine; and aromatic resins such as phenol/ ormaldehyde condensates and phenol/formaldehyde/alkanolamine condensates.
  • Preferred initiators include water, alkylene glycols, glycerine, trimethylolpropane and pentaerythritol.
  • the preparation procedures for the polyols suitable for use in the process of the invention are well known to those skilled in the art 0 and do not require further explanation.
  • Exemplary of commercially available polyether polyols corresponding to the above-defined components include, for example, for polyol (i), products designated as VORANOL EP1900, VORANOL CP6008 and VORALUX HP700; and for polyol (ii), VORANOL CP1421, all sold by The Dow Chemical Company.
  • the polyahl may urther contain a stably dispersed particulate polymer in an amount of from 2 to 20, preferably from 4 to 12 weight percent, based on the total weight of the polyahl including particulate polymer.
  • Suitable particulate polymers include polyurea (PHD), polyisocyanate - polyamine adducts (PIPA) and particularly styrene/acrylonitrile (SAN) adducts.
  • Polyoxyalkylene polyols containing the particulate polymer can be prepared by, for example, in situ polymerizing of styrene with acrylonitrile in a polyoxyalkylene polyol corresponding, for example, to the above-described polyol (i) or (ii).
  • Exemplary of commercially available polyether polyols further comprising a stably dispersed particulate polymer and suitable for use as a polyahl component in the present invention include for example products designated as VORALUX HN 201 available from The Dow Chemical Company.
  • the present invention requires the presence of a processing aid to assist in the manufacture of the foam and additionally to enhance the SAG performance of the resulting o foam.
  • the processing aid is present in an amount of from 1 to 20, preferably from 5, more preferably from 7, and preferably up to 15, and more preferably up to 12.5 parts per 100 parts by total weight of the polyahl.
  • the processing aid comprises one or more monohydroxyl polyether substances having an equivalent weight of from 600 to 5000, preferably from 1000 to 4000, and more preferably from 1500 to 3500.
  • the monohydroxyl polyether has an 5 oxyethylene content of from 25 to 75, preferably from 30 to 60, and more preferably from 35 to 55 percent based on its total weight, the balance comprising oxypropylene or oxybutylene units.
  • Commercially available substances suitable for use as processing aids of this invention include products sold by The Dow Chemical Company under the trademark of SYNALOX such as, for example, SYNALOX 25-50B and especially SYNALOX 25-300B. 0 The
  • the blowing agent used in the present invention comprises water which reacts with polyisocyanate leading to the in situ production of carbon dioxide.
  • the water is present in an amount of from 2 to 10, preferably from 2.5 to 8, more preferably to 6.5, and most preferably to 5.5 parts per 100 parts by weight of total polyahl.
  • the blowing agent consists of water.
  • the blowing capacity provided by water may be supplemented by physical blowing agents.
  • Exemplary of such physical blowing agents include fluorocarbons and chlorofluorocarbons such as, for example, dichlorotrifluoroethane (R-123), dichlorofluoroethane (R-141a), chlorodifluoroethane 0 (R-142b), tetrafluoroethane (R-134a), and chlorodifluoromethane (R-22); hydrocarbons such as butane, pentane, cyclopentane, hexane and cyclohexane; and entrained gases such as air, argon and nitrogen.
  • the blowing agent is present in an amount to confer to the resulting foam a free rise density as already mentioned.
  • chain extending agents include, for example, glycerine and diethanolamine.
  • Foam stabilizing agents include silicon surfactants, for example, siloxane-oxyalkylene copolymers such as products sold under the trademark TEGOSTAB by Th. Goldschmidt AG including B-41 13, B-4690 and B-8681 ; and products sold by Air Products including the product designated as DABCO DC 5258.
  • Suitable catalysts which may be used to promote the formation of urethane groups include tertiary amines and organometallic compounds especially tin compounds.
  • tertiary amine compounds include N,N-dimethylcyclohexylamine,
  • N,N-dimethylbenzylamine, N,N-dimethylethanolamine, bis(dimethylaminoethyl)ether and 1 , 4-diazobicyclo[2,2,2]octane; of tin compounds include stannous octoate and dibutyltin dilaurate.
  • Combinations of amine and/or tin compounds as catalyst may advantageously be present.
  • antimony-, phosphorus- or nitrogen-containing substances including for example, melamine, tris(chloroethyl)phosphonate or preferably halogen-free phosphorus compounds including for example triethylphosphate.
  • MDI - A ISONATE M100, a proprietary urethane-modified MDI composition with an NCO content of 29 weight percent, available from The Dow Chemical Company.
  • Polyol 1 A glycerine-initiated polyoxypropylene-oxyethylene polyol of 2000 equivalent weight, with an oxyethylene content of 14.5 percent, and primary OH content of 80 percent.
  • Polyol 2 A glycerine-initiated polyoxypropylene-oxyethylene polyol of 1600 equivalent weight, with an oxyethylene content of 17 percent, and primary OH content of 85 percent, and further containing 21 weight percent of a particulate styrene/acrylonitrile polymer
  • Polyol 3 A glycerine-initiated polyoxypropylene-oxyethylene polyol of 1670 equivalent weight with an oxyethylene content of 75 percent, and primary OH content of 50 percent.
  • Processing Aid - 1 SYNALOX 25-300B a proprietary monohydroxyl polyether, available from The Dow Chemical Company, and understood to have a molecular weight of 3000 and an oxyethylene content of 50 percent.
  • Catalyst 1 DABCO 33LV, an amine-based proprietary urethane-promoting catalyst available from Air Products.
  • Catalyst 2 NIAX A-1, an amine-based proprietary urethane-promoting catalyst available from OSi Specialities.
  • Catalyst 3 Stannous Octoate.
  • Surfactant 1 TEGOSTAB B 8681, a silicone-based proprietary surfactant available from Th Goldschmidt AG.
  • Surfactant 2 DABCO DC 5258, a silicone-based proprietary surfactant available from Air Products.
  • Flexible, slabstock, polyurethane foam is prepared, according to the formulation given in Table I using a high pressure dispenser unit operating at 2900 rpm, with all component streams at 20 C C, and with a polyahl output of 25 kg/min. Properties of the resulting foam is reported in Table I.

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

L'invention concerne la production de mousse de polyuréthanne, à base de diphénylisocyanate de méthylène, expansée à l'eau, notamment de mousse souple de polyuréthanne en bloc. Cette mousse est produite au moyen d'un auxiliaire de transformation comprenant au moins un polyéther de monohydroxyle présentant un poids équivalent compris entre 600 et 5000, ainsi qu'une teneur en oxyéthylène comprise entre 25 et 75 % en poids. Cet auxiliaire de transformation autorise une utilisation plus efficace de l'eau en tant qu'agent d'expansion et permet d'obtenir une mousse de densité réduite présentant des propriétés physiques intéressantes.
PCT/US1995/010717 1994-08-26 1995-08-23 Mousse souple de polyurethanne de densite reduite produite a partir de diphenylisocyanate de methylene WO1996006874A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU34131/95A AU3413195A (en) 1994-08-26 1995-08-23 Reduced density flexible polyurethane foam from methylene diphenylisocyanate

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29663294A 1994-08-26 1994-08-26
US08/296,632 1994-08-26

Publications (1)

Publication Number Publication Date
WO1996006874A1 true WO1996006874A1 (fr) 1996-03-07

Family

ID=23142852

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/010717 WO1996006874A1 (fr) 1994-08-26 1995-08-23 Mousse souple de polyurethanne de densite reduite produite a partir de diphenylisocyanate de methylene

Country Status (2)

Country Link
AU (1) AU3413195A (fr)
WO (1) WO1996006874A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004020496A1 (fr) * 2002-08-27 2004-03-11 Shell Internationale Research Maatschappij B.V. Combinaison de polyol
US6914117B2 (en) 2001-05-21 2005-07-05 Huntsman International Llc Elastomeric polyurethane material
US6946497B2 (en) 2001-04-27 2005-09-20 Huntsman International Llc Process for making visco-elastic foam
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
US9255174B2 (en) 2010-09-29 2016-02-09 Dow Global Technologies Llc Use of poly(butylene oxide) polyol to improve durability of MDI-polyurethane foams
WO2017006357A1 (fr) 2015-07-06 2017-01-12 Dow Global Technologies Llc Prépolymères de polyuréthane

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1487458A (fr) * 1966-05-26 1967-07-07 Naphtachimie Sa Mousses de polyuréthane
FR2268036A1 (en) * 1974-04-19 1975-11-14 Naphtachimie Sa Polyurethane soft foams - obtd. from particular polyether polyols, polyisocyantes and crosslinking agents
WO1994004586A1 (fr) * 1992-08-14 1994-03-03 Dow Europe S.A. Mousses de polyurethane flexibles, moulees, durcies a chaud et a faible resistance mecanique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1487458A (fr) * 1966-05-26 1967-07-07 Naphtachimie Sa Mousses de polyuréthane
FR2268036A1 (en) * 1974-04-19 1975-11-14 Naphtachimie Sa Polyurethane soft foams - obtd. from particular polyether polyols, polyisocyantes and crosslinking agents
WO1994004586A1 (fr) * 1992-08-14 1994-03-03 Dow Europe S.A. Mousses de polyurethane flexibles, moulees, durcies a chaud et a faible resistance mecanique

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6946497B2 (en) 2001-04-27 2005-09-20 Huntsman International Llc Process for making visco-elastic foam
US6914117B2 (en) 2001-05-21 2005-07-05 Huntsman International Llc Elastomeric polyurethane material
WO2004020496A1 (fr) * 2002-08-27 2004-03-11 Shell Internationale Research Maatschappij B.V. Combinaison de polyol
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
US9255174B2 (en) 2010-09-29 2016-02-09 Dow Global Technologies Llc Use of poly(butylene oxide) polyol to improve durability of MDI-polyurethane foams
WO2017006357A1 (fr) 2015-07-06 2017-01-12 Dow Global Technologies Llc Prépolymères de polyuréthane

Also Published As

Publication number Publication date
AU3413195A (en) 1996-03-22

Similar Documents

Publication Publication Date Title
AU654593B2 (en) Polyol compositions
EP0712876B1 (fr) Composition d&#39;isocyanate et procédé de préparation de mousses flexibles à partir de celle-ci
RU2437898C2 (ru) Способ изготовления вязкоэластичных пеноматериалов
CA2084807C (fr) Mousse de polyurethane
EP0689561B1 (fr) Mousse de polyurethane contenant un solide organique particulaire et procede pour sa preparation
CA2412078C (fr) Procede de fabrication d&#39;une mousse de polyurethanne souple
US6147134A (en) Process for preparing rigid and flexible polyurethane foams
AU2001287584A1 (en) Process for making a flexible polyurethane foam
JPH04300913A (ja) イソシアネート末端プレポリマー及びそれより製造されるポリウレタンフォーム
EP0731823A1 (fr) Mousse en polyurethanne souple semblable au latex et procede de fabrication
WO1994029361A1 (fr) Procede de production de mousses souples
JP5204754B2 (ja) ポリウレタンフォームの製造方法
US6376698B1 (en) Prepolymers
WO1996006874A1 (fr) Mousse souple de polyurethanne de densite reduite produite a partir de diphenylisocyanate de methylene
HK1004558B (en) Isocyanate composition and process for making flexible foams therefrom

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AM AT AU BB BG BR BY CA CH CN CZ DE DK EE ES FI GB GE HU IS JP KE KG KR KZ LK LR LT LU LV MD MG MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TT UA UG UZ

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): KE MW SD SZ UG AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA