WO2022238293A1 - Flexible foams comprising flame-retardant polyurethane, a process for their production and use thereof - Google Patents
Flexible foams comprising flame-retardant polyurethane, a process for their production and use thereof Download PDFInfo
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- WO2022238293A1 WO2022238293A1 PCT/EP2022/062422 EP2022062422W WO2022238293A1 WO 2022238293 A1 WO2022238293 A1 WO 2022238293A1 EP 2022062422 W EP2022062422 W EP 2022062422W WO 2022238293 A1 WO2022238293 A1 WO 2022238293A1
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- Prior art keywords
- hydrogen
- formula
- flame
- carbon atoms
- compounds
- Prior art date
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 158
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000004814 polyurethane Substances 0.000 title claims abstract description 81
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 80
- 239000006260 foam Substances 0.000 title claims description 64
- 238000004519 manufacturing process Methods 0.000 title description 28
- 238000000034 method Methods 0.000 title description 25
- 230000008569 process Effects 0.000 title description 18
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 94
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 94
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 69
- 239000001257 hydrogen Substances 0.000 claims abstract description 69
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 50
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 41
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 30
- 125000003118 aryl group Chemical group 0.000 claims abstract description 29
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 29
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 125000000962 organic group Chemical group 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims description 73
- 239000000203 mixture Substances 0.000 claims description 47
- 229920005862 polyol Polymers 0.000 claims description 41
- 150000003077 polyols Chemical class 0.000 claims description 37
- 239000005056 polyisocyanate Substances 0.000 claims description 27
- 229920001228 polyisocyanate Polymers 0.000 claims description 27
- 239000012948 isocyanate Substances 0.000 claims description 25
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 25
- 150000002513 isocyanates Chemical class 0.000 claims description 24
- -1 ether polyol Chemical class 0.000 claims description 21
- 239000000654 additive Substances 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229920005906 polyester polyol Polymers 0.000 claims description 8
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 5
- 239000000806 elastomer Substances 0.000 claims description 5
- AUONHKJOIZSQGR-UHFFFAOYSA-N oxophosphane Chemical compound P=O AUONHKJOIZSQGR-UHFFFAOYSA-N 0.000 claims description 4
- 229920001281 polyalkylene Polymers 0.000 claims description 4
- 239000004753 textile Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 230000003301 hydrolyzing effect Effects 0.000 abstract description 9
- 230000007062 hydrolysis Effects 0.000 description 18
- 238000006460 hydrolysis reaction Methods 0.000 description 18
- 239000002253 acid Substances 0.000 description 14
- 230000006835 compression Effects 0.000 description 14
- 238000007906 compression Methods 0.000 description 14
- 229920000570 polyether Polymers 0.000 description 14
- 239000000463 material Substances 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- 239000012855 volatile organic compound Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000004721 Polyphenylene oxide Substances 0.000 description 11
- 230000032683 aging Effects 0.000 description 11
- 238000009472 formulation Methods 0.000 description 11
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 9
- 125000002947 alkylene group Chemical group 0.000 description 9
- MPQXHAGKBWFSNV-UHFFFAOYSA-N oxidophosphanium Chemical class [PH3]=O MPQXHAGKBWFSNV-UHFFFAOYSA-N 0.000 description 9
- CTKINSOISVBQLD-UHFFFAOYSA-N Glycidol Chemical compound OCC1CO1 CTKINSOISVBQLD-UHFFFAOYSA-N 0.000 description 8
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 8
- 229920000728 polyester Polymers 0.000 description 8
- MRVZORUPSXTRHD-UHFFFAOYSA-N bis(hydroxymethyl)phosphorylmethanol Chemical compound OCP(=O)(CO)CO MRVZORUPSXTRHD-UHFFFAOYSA-N 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 239000004604 Blowing Agent Substances 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 125000001931 aliphatic group Chemical group 0.000 description 6
- 238000005187 foaming Methods 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 239000000779 smoke Substances 0.000 description 6
- KVMPUXDNESXNOH-UHFFFAOYSA-N tris(1-chloropropan-2-yl) phosphate Chemical compound ClCC(C)OP(=O)(OC(C)CCl)OC(C)CCl KVMPUXDNESXNOH-UHFFFAOYSA-N 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 5
- 150000004945 aromatic hydrocarbons Chemical group 0.000 description 5
- 150000002148 esters Chemical class 0.000 description 5
- 229910052736 halogen Inorganic materials 0.000 description 5
- 150000002367 halogens Chemical class 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 239000003381 stabilizer Substances 0.000 description 5
- 239000007858 starting material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 238000013508 migration Methods 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 150000002924 oxiranes Chemical class 0.000 description 4
- 235000012424 soybean oil Nutrition 0.000 description 4
- 239000003549 soybean oil Substances 0.000 description 4
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 125000000753 cycloalkyl group Chemical group 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 125000005442 diisocyanate group Chemical group 0.000 description 3
- 150000002009 diols Chemical group 0.000 description 3
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 3
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- ASLWPAWFJZFCKF-UHFFFAOYSA-N tris(1,3-dichloropropan-2-yl) phosphate Chemical compound ClCC(CCl)OP(=O)(OC(CCl)CCl)OC(CCl)CCl ASLWPAWFJZFCKF-UHFFFAOYSA-N 0.000 description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004970 Chain extender Substances 0.000 description 2
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-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
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000004609 Impact Modifier Substances 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 description 2
- OAVRZQFVNQGFNV-UHFFFAOYSA-N OCP(=O)CO Chemical compound OCP(=O)CO OAVRZQFVNQGFNV-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- 125000002877 alkyl aryl group Chemical group 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 125000003710 aryl alkyl group Chemical group 0.000 description 2
- 230000003385 bacteriostatic effect Effects 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000003776 cleavage reaction Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
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- 125000000623 heterocyclic group Chemical group 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
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- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 2
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- 238000002386 leaching Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- HXZSFRJGDPGVNY-UHFFFAOYSA-N methyl(oxido)phosphanium Chemical compound C[PH2]=O HXZSFRJGDPGVNY-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000003960 organic solvent Substances 0.000 description 2
- 150000003017 phosphorus Chemical class 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
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- 229910052717 sulfur Inorganic materials 0.000 description 2
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- MDMUYJRRYYXDLZ-UHFFFAOYSA-N tert-butyl 2-methyl-1-oxido-3,4-dihydropyrrol-1-ium-2-carboxylate Chemical compound CC(C)(C)OC(=O)C1(C)CCC=[N+]1[O-] MDMUYJRRYYXDLZ-UHFFFAOYSA-N 0.000 description 2
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
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- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 1
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- 229940043375 1,5-pentanediol Drugs 0.000 description 1
- LTIKIBFTASQKMM-UHFFFAOYSA-N 1-[bis(4-isocyanatophenyl)methyl]-4-isocyanatobenzene Chemical compound C1=CC(N=C=O)=CC=C1C(C=1C=CC(=CC=1)N=C=O)C1=CC=C(N=C=O)C=C1 LTIKIBFTASQKMM-UHFFFAOYSA-N 0.000 description 1
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- FJNCXZZQNBKEJT-UHFFFAOYSA-N 8beta-hydroxymarrubiin Natural products O1C(=O)C2(C)CCCC3(C)C2C1CC(C)(O)C3(O)CCC=1C=COC=1 FJNCXZZQNBKEJT-UHFFFAOYSA-N 0.000 description 1
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- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
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- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- OZMJXAQDMVDWBK-UHFFFAOYSA-N carbamic acid;ethyl carbamate Chemical compound NC(O)=O.CCOC(N)=O OZMJXAQDMVDWBK-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 150000001718 carbodiimides Chemical class 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- BHBRSNQBODBPND-UHFFFAOYSA-N chloro-[chloromethyl(methyl)phosphoryl]methane Chemical compound ClCP(=O)(C)CCl BHBRSNQBODBPND-UHFFFAOYSA-N 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- GPLRAVKSCUXZTP-UHFFFAOYSA-N diglycerol Chemical compound OCC(O)COCC(O)CO GPLRAVKSCUXZTP-UHFFFAOYSA-N 0.000 description 1
- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 229940113088 dimethylacetamide Drugs 0.000 description 1
- CZZYITDELCSZES-UHFFFAOYSA-N diphenylmethane Chemical compound C=1C=CC=CC=1CC1=CC=CC=C1 CZZYITDELCSZES-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 231100000613 environmental toxicology Toxicity 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 125000004836 hexamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- SAMYCKUDTNLASP-UHFFFAOYSA-N hexane-2,2-diol Chemical compound CCCCC(C)(O)O SAMYCKUDTNLASP-UHFFFAOYSA-N 0.000 description 1
- 125000005113 hydroxyalkoxy group Chemical group 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- AYLRODJJLADBOB-QMMMGPOBSA-N methyl (2s)-2,6-diisocyanatohexanoate Chemical compound COC(=O)[C@@H](N=C=O)CCCCN=C=O AYLRODJJLADBOB-QMMMGPOBSA-N 0.000 description 1
- 125000006178 methyl benzyl group Chemical group 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000004634 thermosetting polymer Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 125000005628 tolylene group Chemical group 0.000 description 1
- 230000002110 toxicologic effect Effects 0.000 description 1
- 231100000027 toxicology Toxicity 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- HQUQLFOMPYWACS-UHFFFAOYSA-N tris(2-chloroethyl) phosphate Chemical compound ClCCOP(=O)(OCCCl)OCCCl HQUQLFOMPYWACS-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N urethane group Chemical group NC(=O)OCC JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 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
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
- C08G18/7621—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring being toluene diisocyanate including isomer mixtures
-
- 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
- C08G18/3878—Low-molecular-weight compounds having heteroatoms other than oxygen having phosphorus
- C08G18/388—Low-molecular-weight compounds having heteroatoms other than oxygen having phosphorus having phosphorus bound to carbon and/or to 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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
- C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
- C08G18/4241—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols from dicarboxylic acids and dialcohols in combination with polycarboxylic acids and/or polyhydroxy compounds which are at least trifunctional
-
- 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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4244—Polycondensates having carboxylic or carbonic ester groups in the main chain containing oxygen in the form of ether groups
- C08G18/4247—Polycondensates having carboxylic or carbonic ester groups in the main chain containing oxygen in the form of ether groups derived from polyols containing at least one ether group and polycarboxylic 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
- C08G18/28—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
- C08G18/4825—Polyethers containing two hydroxy 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
- C08G18/50—Polyethers having heteroatoms other than oxygen
- C08G18/5075—Polyethers having heteroatoms other than oxygen having phosphorus
- C08G18/5078—Polyethers having heteroatoms other than oxygen having phosphorus having phosphorus bound to carbon and/or to 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
- 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
- C08G2110/0083—Foam properties prepared using water as the sole blowing agent
Definitions
- Flexible foams comprising flame-retardant polyurethane, a process for their production and use thereof
- the invention relates to flexible foams comprising flame-retardant polyurethanes with high aging resistance, a process for their production and to their use, e.g. for the manufacture of molded bodies.
- Polyurethane foams are plastics used in many sectors, for example furniture, mattresses, transport, construction, and technical insulation applications.
- stringent fire-protection requirements such as those demanded for materials used, inter alia, in the interior fitting-out of automobiles, of rail vehicles, or of aircraft, or materials used to insulate buildings.
- polyurethane foams generally have to be provided with flame retardants.
- flame retardants A wide variety of flame retardants are known and are commercially available for this purpose. However, their use is often inhibited by considerable technical usage problems and/or toxicological concerns.
- Halogen-free flame-retardant systems are also preferred on grounds of environmental toxicology, and on grounds of improved ancillary properties in the event of a fire, in terms of smoke density and smoke toxicity.
- Halogen-free flame retardants can also be of particular interest for performance-related reasons. For example, when halogenated flame retardants are used severe corrosion is observed on the plant components used for the flame-lamination of polyurethane 2 foams. This can be attributed to the hydrohalic acid emissions arising during the flame-lamination of halogen-containing polyurethane foams.
- Flame-lamination is the term used for a process for bonding of textiles and foams, by using a flame to melt one side of a foam sheet, and then immediately pressing a textile web onto the same.
- VOC volatile organic compounds
- hydroxy-containing oligomeric phosphoric esters (DE-A 4342972) and hydroxyalkyl phosphonates (DE-A 19927548).
- US 3,445,405 discloses flame-resistant polyurethane compositions which are produced by using condensation products of at least one alkylene oxide and tris(hydroxymethyl)phosphine oxide in the reaction involving a polyisocyanate and a polyether polymer.
- tris-functionalized phosphine oxides are disclosed as flame retardants for polyurethanes.
- US 5,985,965 A discloses flame-resistant poulyurethanes. These contain mixtures of oligomeric phosphoric acid esters which carry hydroxyalkoxy groups. No phosphine oxides are mentioned herein.
- A1 reactive halogen-free flame-retardant polyether polyols are known. These are prepared from trimethylol phosphorus oxide by addition reaction with propylene oxide / ethylene oxide. The product is a polyvalent reactive halogen-free flame-retardant polyether which can be used in the manufacture of flame-retardant rigid foam materials.
- tris-functionalized phosphine oxides are disclosed.
- K. Zhang et al. in Journal of Applied Polymer Science, 135(5), 1-10 (2016) disclose a flame retardant polyurethane foam prepared from compatible blends of soybean oil-based polyol and phosphorus containing polyol.
- the phosphorus containing polyether polyol was synthesized by polymerization between tris- (hydroxymethyl) phosphine oxide and propylene oxide.
- a soybean oil-based polyol was synthesized from epoxidized soybean oil by ring-opening reaction with lactic acid.
- Polyurethane foams were prepared by mixing soybean oil-based polyol with phosphorus containing polyether polyol. Several properties of the polyurethane foams, such as their density and thermal degradation property were investigated.
- VOC volatile organic substances
- flame retardants are small and unreactive molecules with a tendency to migrate and evaporate, i.e. leading to leaching and emission of VOC.
- reactive or polymeric flame retardants or small reactive molecules There are two concepts on to achieve the demand for low emission by either employing reactive or polymeric flame retardants or small reactive molecules. The latter having the advantage of being usually less viscous and thus easier to process. 4
- the molecular architecture can play a decisive role in foam production.
- a low cross-linking density is mandatory to allow a defect-free formation of an open-porous structure of the foam.
- the phosphine oxides disclosed in the prior art for polyurethane foam applications have one major drawback of being three-functional (i.e. each molecule carrying three hydroxy groups) thus each acting as a cross linker in the polymerization reaction (see e.g. US 3,445,405 A or CN 105801833 A or K. Zhang et al. article mentioned above).
- US 6,380,273 B1 discloses a process for the production of polyurethane foams containing halogen-free flame retardants and having high oxidative thermal resistance during foaming.
- the process is usable for the manufacture of flexible ester and ether foams and for rigid foams and facilitates the production of polyurethane foams having low fogging values.
- the process gives polyurethane foams having high aging resistance of the flame resistance, i.e. the polyurethane foam still has effective flame resistance after corresponding storage duration, even at elevated temperature.
- the disclosed process for the production of flame-resistant flexible polyurethane foams having a low susceptibility to core discoloration comprises employing hydroxyalkyl phosphonates as halogen-free flame retardants and as core discoloration inhibitors.
- US 2001/0034388 A1 discloses a halogen-free, water-blown, flame-retardant rigid polyurethane foam which meets the necessary and prescribed requirements for flame retardancy, ease of production, low smoke density and low smoke toxicity.
- the polyurethane foam described in this document comprises oxalkylated alkyl- phosphonic acids as a flame retardant.
- US 2004/0077741 A1 discloses flame-retardant flexible polyurethane foams with high aging resistance, and a process for their production.
- This document describes low-emission polyurethane foams having reduced halogen content, which when compared with a halogen-free flame-retardant polyurethane foam, has improved resistance to hydrolysis aging, and, when compared with a prior-art polyurethane foam, has lower halogen content.
- the flame-retardant flexible polyurethane foams 5 disclosed in this document comprise a mixture composed of hydroxyalkyl phosphonates and chlorinated phosphoric esters.
- a disadvantage frequently found in the polyurethane foams known hitherto is that although the use of reactive, liquid halogen-free flame retardants achieves a high level of flame retardant action, in particular in the case of the phosphoric esters mentioned in DE-A 4342972 and the phosphonic esters mentioned in DE-A 19927548, a marked plasticizing action arises at the same time, and the resultant polyurethane foam is highly susceptible to hydrolysis, and therefore the mechanical properties of the foam have only low resistance to hydrolysis aging.
- halogenated phosphorus-based flame retardants for polyurethane applications like tris(2-chloroisopropyl)phosphate (TCPP) and tris(1 ,3-dichloroisopropyl)phosphate (TDCPP) are under regulatory scrutiny. While some of these flame retardants have already been banned in certain applications and regions, others are still being used, but alternatives are being sought after. Since most polyurethane materials are intrinsically flammable, flame retardants are needed in various applications, e.g. in upholstery and furniture, in transportation applications such as automotive, railway or aviation interior, or in building insulation.
- Halogenated phosphorus-based flame retardants can be replaced with non- halogenated alternatives, e.g. various triarylphosphates like triphenylphosphate (TPP) or mixtures of alkylated aryl phosphates. While some of these avoid major problems of halogenated flame retardants - like regular scrutiny or formation of corrosive gases in the flame lamination process commonly used in the production of automotive head- and seat liner - there are still significant disadvantages. It is 6 known that additive flame retardants such as triarylphosphates can migrate and leach out of polyurethane foams, leading to significant health concerns and often to unwanted emission of organic compounds.
- TPP triphenylphosphate
- additive flame retardants such as triarylphosphates can migrate and leach out of polyurethane foams, leading to significant health concerns and often to unwanted emission of organic compounds.
- Low-emission materials are particularly important for automotive applications, where limits are defined in standards like testing VDA-278 (emission of volatile organic compounds, VOC) and DIN 75201 B (condensable emissions, “fogging”). Other areas with low- emission requirements include consumer applications like mattresses and furniture.
- a safe and proven way is to use reactive flame retardants, which usually bear hydroxyl groups, but might also contain other functional groups with active hydrogen atoms. These flame retardants will react with isocyanate groups present during the polyurethane manufacturing process, forming covalent bonds and thus permanently binding the flame retardant to the polymeric backbone. These covalent bonds effectively prevent migration and leaching of the flame retardant from the polyurethane material.
- Another object of the present invention is the provision of a flame-retardant flexible polyurethane foam having an excellent flame-retardancy combined with very low VOC emission as well as resistance against hydrolysis when subjected to high temperatures.
- the present invention relates to flexible polyurethane foams which comprise at least one flame retardant polyurethane comprising structural units of formula (X) and/or (XI) wherein
- R 1 is a monovalent organic group
- R 2 , R 3 , R 4 and R 5 independently of one another are hydrogen, alkyl groups having between one and eight carbon atoms or aryl groups having between six and eighteen carbon atoms,
- R 6 and R 7 independently of one another are hydrogen or a group of formula (XII)
- R 8 is hydrogen or a group of formula (XII), n and m independently of one another are integers between 0 and 10, o, p and q independently of one another are integers between 0 and 5, with the proviso that the number of structural units of formula in the the structural units of formula (XI) is between 1 and 20.
- the flame retardant polyurethanes used in the flexible polyurethane foams of the present invention usually comprise besides the structural units of formula (X) and/or (XI) structural units derived from polyisocyanates and structural units derived from compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) defined below.
- Structural units derived from polyisocyanates are those which are in general derived from di- or tri-isocyanates. These structural units have the formula (XV)
- PIC is a di- or trivalent organic residue, preferably a di- or trivalent aliphatic, cycloaliphatic or aromatic hydrocarbon residue, and t is 1 or 2.
- (II) and (VI) are di- or trivalent organic residues, preferably di- or trivalent aliphatic, cycloaliphatic or aromatic hydrocarbon residues.
- structural units derived from polyisocyanates and structural units derived from compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) form recurring structural polyurethane unists of formula (XVI)
- PIC and DIOL independently of one another are divalent organic residues, preferably divalent aliphatic, cycloaliphatic and/or aromatic hydrocarbon residues.
- Preferred flexible polyurethane foams of this invention comprise a flame-retardant polyurethane comprising structural units of formula (X), preferably a flame- retardant polyurethane comprising a mixture of different structural units of formula (X).
- Preferred flexible polyurethane foams of this invention comprise a flame-retardant polyurethane comprising structural units of formula (X), wherein one of R 2 or R 3 is hydrogen and the other one of R 2 or R 3 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms and wherein one of R 4 or R 5 is hydrogen and the other one of R 4 or R 5 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms. 10
- flexible polyurethane foams comprising a flame-retardant polyurethane comprising structural units of formula (X), wherein one of R 2 or R 3 is hydrogen and the other one of R 2 or R 3 is hydrogen or an alkyl group having between one and two carbon atoms, preferably methyl, and wherein one of R 4 or R 5 is hydrogen and the other one of R 4 or R 5 is hydrogen or an alkyl group having between one and two carbon atoms, preferably methyl.
- flexible polyurethane foams comprising a flame-retardant polyurethane comprising structural units of formula (X), wherein R 2 , R 3 , R 4 and R 5 independently of one another are selected from hydrogen, Ci-C 6 -alkyl and phenyl, more preferred from hydrogen and Ci-Ce-alkyl, and still more preferred from hydrogen and Ci-C3-alkyl, and most preferred from hydrogen and methyl.
- R 2 , R 3 , R 4 and R 5 independently of one another are selected from hydrogen, Ci-C 6 -alkyl and phenyl, more preferred from hydrogen and Ci-Ce-alkyl, and still more preferred from hydrogen and Ci-C3-alkyl, and most preferred from hydrogen and methyl.
- flame-retardant polyurethanes comprising at least two different structural units of below defined formula (Xa) may be present, or at least two different structural units of below defined formula (Xb), or at least two different structural units of below defined formula (Xc), or at least two structural units of belos defined formulae (Xa) and (Xb), or at least two structural units of below defined formulae (Xa) and (Xc), or at least two structural units of below defined formulae (Xb) and (Xc).
- flexible polyurethane foams comprising flame-retardant polyurethanes comprising structural units of formula (X), wherein R 2 , R 3 , R 4 and R 5 independently of one another are selected from hydrogen, Ci-C 6 -alkyl and phenyl, more preferred from hydrogen and Ci-Ce-alkyl, and still more preferred from hydrogen and Ci-C3-alkyl, and most preferred from hydrogen and methyl.
- R 2 , R 3 , R 4 and R 5 independently of one another are selected from hydrogen, Ci-C 6 -alkyl and phenyl, more preferred from hydrogen and Ci-Ce-alkyl, and still more preferred from hydrogen and Ci-C3-alkyl, and most preferred from hydrogen and methyl.
- These preferred flame-retardant polyurethanes comprise at least two different structural units of formula (Xa), (Xb) and/or (Xc) 11 wherein
- R 1 , m and n are as hereinbefore defined,
- R 2a and R 3a independently of one another is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon
- R 4a and R 5a independently of one another is an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon.
- Other preferred flexible polyurethane foams comprise at least one flame-retardant polyurethane comprising structural units of formula (X) and/or of formula (XI), wherein R 1 is Ci-Ce-alkyl, cyclohexyl or phenyl, preferred Ci-C3-alkyl, and most preferred methyl.
- Still other preferred flexible polyurethane foams comprise flame-retardant polyurethanes comprising structural units of formula (X), wherein the sum n+m is a number between 1 and 15 and most preferred between 4 and 12.
- Other preferred flexible polyurethane foams comprise flame-retardant polyurethanes comprising at least one structural unit of formula (XI), preferably 12 different structural units of formula (XI), wherein R 1 is Ci-Ce-alkyl, cyclohexyl or phenyl, preferred Ci-C 3 -alkyl, and most preferred methyl, and wherein the number of structural units of formula is between 1 and 10.
- the term "monovalent organic group” as used herein includes a monovalent organic radical derived from an organic group by removal of one hydrogen atom.
- Organic groups may be saturated or unsaturated straight- chain, branched-chain or mono- or multicyclic hydrocarbons or saturated or unsaturated heterocyclic groups, having - besides the ring carbon atoms - one or more ring-heteroatoms, such as oxygen, nitrogen or sulfur.
- alkyl as used herein includes a saturated monovalent aliphatic hydrocarbon radical with straight or branched moieties, preferably a Ci-Ci 2 -alkyl radical and most preferred a Ci-C 6 -alkyl radical.
- alkyl radicals are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl or hexyl, preferably methyl or ethyl and most preferred methyl.
- alkylene as used herein includes a saturated divalent aliphatic hydrocarbon radical with straight or branched moieties, preferably a C 2 -Ci 2 -alkylene radical and most preferred a C 2 -C 6 -alkylene radical.
- alkylene radicals are ethylene, propylene, isopropylene, butylene, isobutylene, tert-butylene, pentylen or hexylene, preferably ethylene, propylene, isopropylene or butylene and most preferred ethylene, propylene or isopropylene. 13
- cycloalkyl as used herein includes a cyclic saturated monovalent hydrocarbon radical with five to seven ring carbon atoms.
- An example of a cycloalkyl group is cyclohexyl.
- aryl as used herein includes an aromatic radical derived from an aromatic hydrocarbon by removal of one hydrogen, such as, but not limited to, phenyl or naphthyl.
- aralkyl as used herein signifies an "aryl- alkyl-” group such as, but not limited to: benzyl (C6H5-CH2-) or methylbenzyl (CH3-C6H4-CH2-).
- alkylaryl as used herein signifies an "alkyl- aryl-” group such as, but not limited to: methylphenyl (CH3-C6H4-), dimethylphenyl ((CH3)2-C6H3-) or isopropylphenyl ((CH3)2C-C6H4-).
- R 1 is a monovalent organic group. This is preferably selected from alkyl, cycloalkyl, aryl, aralkyl or alkylaryl, more preferred selected from Ci-Ce-alkyl, cyclohexyl or phenyl. Still more preferred R 1 is Ci-C3-alkyl, most preferred methyl.
- R 1 examples are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, cyclohexyl or phenyl.
- R 2 , R 3 , R 4 and R 5 independently of one another are hydrogen, alkyl groups having between one and eight carbon atoms or aryl groups having between six and eighteen carbon atoms,
- R 2 , R 3 , R 4 and R 5 preferably are selected from hydrogen, C-i-Cs-alkyl and phenyl, more preferred from hydrogen and Ci-Ce-alkyl, and still more preferred from hydrogen and Ci-C3-alkyl, and most preferred from hydrogen and methyl.
- R 2 , R 3 , R 4 and R 5 as C-i-Cs-alkyl are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, heptyl and octyl. 14
- R 2 and R 3 or of R 4 and R 5 are Ci-C 6 -alkyl or phenyl. Still more preferred one of R 2 and R 3 of R 4 and R 5 and one of of R 4 and R 5 is hydrogen and the other one is Ci-C3-alkyl, most preferred methyl.
- R 6 , R 7 and R 8 independently of one another are hydrogen or a group of formula (XII) which is derived from glycidol.
- the chain length of the alkylene oxide units in the individual groups of formulae (X) and (XII) in the flame-retardant polyurethane is characterized by integers n and m or o and p.
- the chain length of the alkylene oxide units in the individual structural units of formula (X) is characterized by integers n and m.
- Integers m and n independently of one another have values between 0 and 10, preferably between 1 and 10 and more preferred between 1 and 8 and still more preferred between 2 and 6.
- the structural units of formula (X) in a flame-retardant polyurethane may differ in the nature of the groups R 1 to R 5 and/or in the number of recurring units characterized by integers m and n.
- Preferred flame-retardant polyurethanes comprise structural units of formula (X) with the same groups R 1 to R 5 which differ in the values of n and/or m, more preferred in the values of (n+m).
- n+m of a single structural unit in said polyurethane is a number between 0 and 20, preferably between 1 and 15 and most preferred between 4 and 12.
- flame-retardant polyurethanes comprising at least two different structural units of formula (X). More preferred, these flame-retardant 15 polyurethanes comprise different structural units of formula (X) in a molecule, for example structural units of formulae (Xa), (Xb) and/or (Xc) mentioned above.
- Examples of preferred flame retardant polyurethanes comprising structural units of formula (X) are polyurethanes comprising at least two different phosphine oxide structural units of formulae (Xe), (Xf) and/or (Xg) wherein
- R 8 is Ci-C 6 -alkyl, preferably methyl
- R 9 and R 10 independently of one another are hydrogen, C-i-Cs-alkyl or C6-C18- aryl, preferably hydrogen, Ci-C 6 -alkyl or phenyl, most preferred hydrogen or methyl, n and m independently of one another are integers between 0 and 10, preferably between 1 and 10, and wherein the sum n+m is a number between 0 and 20, preferably between 1 and
- Flame-retardant structural units of formula (XI) are derived from methylol-organyl- phosphine oxides and glycidol.
- the chain length of the glycidol units in the individual structural units of formula (XI) is characterized by integers o, p and q.
- Integers o, p and q independently of one another have values between 0 and 5, preferably between 1 and 5 and more preferred between 1 and 3 and still more preferred between 2 and 3.
- the single structural units of formula (XI) in a flame-retardant polyurethane may differ in the nature of the groups R 1 and R 6 to R 8 and/or in the number of recurring units characterized by integers o, p and q.
- Preferred flame-retardant polyurethanes comprise different structural units of formula (XI) with the same groups R 1 which differ in the values of o, p and/or q.
- a preferred flame-retardant polyurethane comprising structural units of formula (XI) the sum o+p+q of a single structural unit in said polyurethane is a number between 2 and 20, preferably between 3 and 15 and most preferred between 4 and 12.
- the flame-retardant polyurethane used in the flexible polyurethane foams comprises besides structural units of formula (X) or (XI) as hereinbefore described, at least one structural unit of formula (Via) 17 wherein
- R 2 , R 3 , R 4 , R 5 , m and n are defined as above,
- R 14 and R 15 independently of one another are hydrogen, alkyl groups having between one and eight carbon atoms or aryl groups having between six and eighteen carbon atoms, and r independently of n and m is an integer between 0 and 10, preferably between 1 and 10.
- Very preferred flame-retardant polyurethanes comprise at least one structural unit of formula (Via) besides at least one structural unit of formula (X), wherein one of R 2 or R 3 is hydrogen and the other one of R 2 or R 3 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms and wherein one of R 4 or R 5 is hydrogen and the other one of R 4 or R 5 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms and wherein one of R 14 or R 15 is hydrogen and the other one of R 14 or R 15 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms.
- Still more preferred flame-retardant polyurethanes comprise at least two different structural units of formula (X) and at least one structural unit of formula (Via). 18
- the content of bifunctional structural units of formulae (X) and/or of formula (XI) is from 50 to 100, more preferred from 90 to 100 and still more preferred from 90 to 99.5 mol %, referring to the total content of structural units of formulae (X), (XI and (Via) in a molecule.
- the content of trifunctional structural units of formula (Via) is from 50 to 0, more preferred from 10 to 0 and still more preferred from 10 to 0.5 mol %, referring to the total content of structural units of formulae (X), (XI) and (Via) in a molecule.
- Flame-retardant polyurethanes comprising structural units of formula (X) and/or (XI) and optionally (Via) may be prepared by standard reactions known to the skilled artisan.
- organic polyisocyanates are reacted with compounds of formula (I) and/or (II) and optionally (VI) together with compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds from formulae (I), (II) and (VI) 19 wherein
- R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 14 , R 15 , m, n, o, p and r are defined as above.
- the compounds of formula (I), (II) or (VI) may be prepared by standard reactions known to the skilled artisan.
- Alkylene oxides of formula (I) may be produced by reacting bis-methylol- phosphine oxide of formula (VII) with one or more epoxides of formula (VIII) wherein R 1 , R 2 and R 3 are as defined hereinbefore.
- Phosphine oxide glycidol compounds of formula (II) may be produced by reacting bis-methylol-phosphine oxide of formula (VII) with glycidol of formula (IX) wherein R 1 is as defined hereinbefore. 20
- Alkylene oxides of formula (VI) may be produced by reacting tris-methylol- phosphine oxide with one or more epoxides of formula (VIII).
- the amounts of bis- or tris-methylol-phosphine oxide and epoxides or glycidol are selected in a manner so that the desired number of recurring alkylene oxide units or glycidol units is obtained.
- the reaction between bis- or tris-methylol-phosphine oxide and epoxides or glycidol may be initiated by mixing said compounds and by heating these compounds in the presence of a basic compound, for example an alkali hydroxide, such as sodium hydroxide or potassium hydroxide.
- a basic compound for example an alkali hydroxide, such as sodium hydroxide or potassium hydroxide.
- the reaction temperature may be varied in a broad range, for example between 50 and 200°C.
- the reaction mixture is preferably agitated, e.g. by using a stirrer.
- the reaction may be carried out at atmospheric pressure, preferably at reduced pressure, for example in the pressure range between 1 and 10 5 Pa, preferably between 10 and 10 4 Pa.
- the reaction may also be carried out in solution using an organic solvent which is inert under reaction conditions.
- organic solvents are aprotic organic solvents, such as dimethyl sulfoxide, dimethyl formamide or dimethyl acetamide, or aromatic hydrocarbons, such as benzene, toluene or xylene.
- Phosphine oxide starting materials of formula (VII) or tris-methylol-phosphine oxide starting materials are known compounds or can be produced using standard procedures of phosphorus-organic chemistry.
- Epoxy starting materials of formulae (VIII) and (IX) are known compounds or can be produced using standard procedures of organic chemistry.
- Examples of preferred epoxy starting materials are ethylene oxide, propylene oxide, styrene oxide or glycidol. 21
- flexible polyurethane foams can be manufactured from flame-retardant polyurethanes comprising structural units of formula (X) and/or (XI) and optionally (Via) derived from alkoxylated phosphine oxide compounds of formula (I) and/or (II) and optionally (VI).
- Single compounds of formula (I) or (II) or mixtures of different compounds of formula (I) or of formula (II) or mixtures of compounds of formulae (I) and (II) or mixtures of compounds of formulae (I) and (VI) or mixtures of compounds of formulae (II) and (VI) or mixtures of compounds of formulae (I), (II) and (VI) may be used in the manufacture of flame-retardant polyurethanes used in the flexible foams of this invention.
- the invention also relates to a kit-of-parts comprising a container A containing an organic polyisocyanate or a mixture of organic polyisocyanates, and comprising a container B containing a mixture of compounds of formula (I) and/or (II) and optionally (VI) together with compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I),
- R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 14 , R 15 , m, n, o, p and r are as defined above.
- the compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) are selected from the group consisting of polyalkylene ether polyols, polyester polyols and hydroxyl-terminated elastomers.
- the compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) are low-molecular weight polyols.
- a compound of formula (I) and/or (II) optionally together with a compound of formula (VI) when incorporated into a polyurethane molecule provides excellent flame-retardancy combined with very low VOC emission as well as resistance against hydrolysis when subjected to high temperatures.
- flexible polyurethane foams comprising flame-retardant polyurethanes comprising structural units derived from compounds of formula (I) and/or (II) and optionally (Via) show an excellent extrudability and moldability in different plastic articles.
- the amount of structural units of formula (X) and/or of formula (XI) and optionally of formula (Via) in a flame-retardant polyurethane used in the flexible foams of this invention may vary in a broad range.
- the amount of structural units of 23 formula (X) and/or of formula (XI) and optionally of formula (Via) is from 0.5 to 30 mol.-%, preferably from 0.5 to 20 mol.-% and most preferred from 1 to 10 mol.-%, referring to the total amount of the polyurethane.
- the amount of structural units derived from polyisocyanates and from compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) in a flame-retardant polyurethane used in the flexible foams of this invention may also vary in a broad range.
- the amount of structural units derived from polyisocyanates and from compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) is from 70 to 99.5 mol.-%, preferably from 80 to 99.5 mol.-% and most preferred from 90 to 99 mol.-%, referring to the total amount of the polyurethane.
- the invention also provides a process for preparing flexible polyurethane foams, which comprises reacting organic polyisocyanates with compounds having at least two hydrogen atoms reactive toward isocyanates and being different from compounds of formulae (I), (I) and (VI), with conventional blowing agents, stabilizers, activators, and/or other conventional auxiliaries and additives, in the presence of flame retardants of formula (I) and/or (II) and optionally (VI) defined hereinbefore.
- organic polyisocyanates are reacted with compounds having at least two hydrogen atoms reactive toward isocyanates and being different from compounds of formulae (I), (II) and (VI), with conventional blowing agents, stabilizers, activators, and/or other conventional auxiliaries and additives, in the presence of a flame retardant of formula (I) or of a mixture of of at least two structurally different flame retardants of formula (I), very preferred of formulae (la), (lb) and/or (lc) 24 wherein
- R 1 , m and n are as hereinbefore defined, R 2a and R 3a independently of one another is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon, and
- R 4a and R 5a independently of one another is an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon.
- the flame retardants of formula (I) or (II) or (VI) are compounds reactive toward isocyanates and are incorporated into the polyurethane when reacted with the polyurethane-forming monomers.
- Polyurethanes are polymers comprising organic units joined by carbamate (urethane) links.
- Polyurethanes may be thermosetting polymers that do not melt when heated; but thermoplastic polyurethanes are also available.
- Polyurethanes are commonly formed by reacting a di- or triisocyanate with a polyol. Both the isocyanates and polyols used to make polyurethanes contain, on average, two or more functional groups per molecule. Diols and diisocyanates lead to linear polyurethanes, crosslinked polyurethanes can be produced e.g. by converting triisocyanate diisocyanate mixtures with triol-diol mixtures. The properties of polyurethanes can be varied in a wide range. Depending on the degree of cross-linking and/or isocyanate or OH component used, thermosets, thermoplastics or elastomers are obtained. In terms of quantity, polyurethane foams are most important.
- the polyurethanes forming flexible foams are characterized by having soft portions in the molecule. These are derived from a reaction between polyisocyanate and polyalkylene ether polyols, polyester polyols or hydroxyl-terminated elastomers, such as hydroxyl-terminated polybutadienes.
- the polyurethanes forming flexible foams besides soft and flexible portions contain hard and rigid portions in the molecule. These are derived from a reaction between polyisocyanate and low-molecular weight polyols, such as ethylene glycol or propylene glycol.
- Starting components for the manufacture of the polyurethanes used for preparing the flexible foams of this invention are, for example, aliphatic, cycloaliphatic, araliphatic, aromatic, or heterocyclic polyisocyanates (e.g. W. Siefken in Justus Liebigs Annalen der Chemie, 562, pp.
- Q(NCO)s for example those of the formula Q(NCO)s, where s is from 2 to 4, preferably from 2 to 3, and Q is an aliphatic hydrocarbon radical having from 2 to 18, preferably from 6 to 10, carbon atoms, a cycloaliphatic hydrocarbon radical having from 4 to 15, preferably from 5 to 10, carbon atoms, an aromatic hydrocarbon radical having from 6 to 15, preferably 26 from 6 to 13, carbon atoms, or an araliphatic hydrocarbon radical having from 8 to 15, preferably from 8 to 13, carbon atoms.
- Q is an aliphatic hydrocarbon radical having from 2 to 18, preferably from 6 to 10, carbon atoms, a cycloaliphatic hydrocarbon radical having from 4 to 15, preferably from 5 to 10, carbon atoms, an aromatic hydrocarbon radical having from 6 to 15, preferably 26 from 6 to 13, carbon atoms, or an araliphatic hydrocarbon radical having from 8 to 15, preferably from 8 to 13, carbon atoms.
- Suitable polyisocyanates are aromatic, alicyclic and/or aliphatic polyisocyanates having at least two isocyanate groups and mixtures thereof. Preference is given to aromatic polyisocyanates such as tolyl diisocyanate, methylene diphenyl diiso cyanate, naphthylene diisocyanate, xylylene diisocyanate, tris(4- isocyanatophenyl)-methane and polymethylene-polyphenylene diisocyanates; alicyclic polyisocyanates such as methylenediphenyl diisocyanate, tolyl diisocyanate; aliphatic polyisocyanates and hexamethylene diisocyanate, isophorone diisocyanate, dimeryl diisocyanate, 1 ,1-methylenebis(4- isocyanatocyclohexane-4,4'-diisocyanatodicyclohexylmet hane isomer mixture
- polyisocyanates readily available industrially and derived from tolylene 2,4- and/or 2, 6-di isocyanate or from diphenylmethane 4,4'- and/or 2,4'-diisocyanate.
- Suitable polyisocyanates are modified products which are obtained by reaction of polyisocyanate with polyol, urea, carbodiimide and/or biuret.
- starting components for the manufacture of the polyurethanes used for preparing the flexible foams of this invention are compounds having at least two hydroxy groups which starting materials are different from compounds of formulae (I), (II) and (VI). These other starting components preferably have a molecular weight of from 400 to 10,000 ("flexible or soft polyol component"). These have preferably from 2 to 8 hydroxy groups, and specifically those of molecular weight from 1000 to 6000, preferably from 200 to 6000, generally compounds having from 2 to 8, but preferably from 2 to 6, hydroxy groups, these compounds being polyethers and polyesters, or else polycarbonates and polyesteramides, as are known per se for the production of cellular polyurethanes, and as are described in 27
- polyesters and polyethers having at least two hydroxy groups are preferred according to the invention.
- polyesters which are obtained by polycondensation of a polyalcohol such as ethylene glycol, diethylene glycol, propylene glycol,
- polyester polyols can be used alone or in combination.
- Other optional starting components for the manufacture of the polyurethanes used for preparing the flexible foams of this invention are compounds having at least two hydroxyl groups and having a molecular weight of from 32 to 399 (“hard polyol component”) which are different from compounds of formulae (I), (II) and (VI).
- hard polyol component compounds having preferably 2 to 8 hydroxyl groups, these compounds serving as chainextenders or crosslinking agents.
- These compounds generally have from 2 to 8, preferably from 2 to 4, hydroxyl groups reactive toward isocyanates.
- the flame-retardant flexible polyurethane foams of the present invention may contain one or more additives.
- the amount of additive(s) may vary in a broad range. Typical amounts of additive(s) are between 0 and 60 % by weight, preferably between 0.5 and 50 % by weight, more preferred between 0.5 and 30 % by weight, and most preferred between 0.5 and 5 % by weight, referring to the total amount of the flame-retardant flexible polyurethane foam.
- additives are antioxidants, blowing agents, further flame retardants, light stabilizers, heat stabilizers, impact modifiers, processing aids, glidants, processing aids, nucleating agents and clarifiers, antistatic agents, lubricants, such as calcium stearate and zinc stearate, viscosity and impact modifiers, 28 compatibilizers and dispersing agents, dyes or pigments, antidripping agents, additives for laser marking, hydrolysis stabilizers, chain extenders, softeners, plasticizers, fillers, reinforcing agents, surface-active additives, foam stabilizers, cell regulators, retarders, further flame-retardant substances, or else substances with fungistatic or bacteriostatic action.
- additives are described in Kunststoff-Handbuch [Plastics Handbook], Volume VII, Carl Hanser Verlag,
- the additive(s) can impart other desired properties to the flexible polyurethane foam of the invention.
- blowing agents are water and/or highly volatile organic hydrocarbons, such as n-pentane, isopentane or cyclopentane, hydrofluoroolefins (HFO) and CO2.
- auxiliaries and additives for example catalysts of the type known per se, surface-active additives, such as emulsifiers and foam stabilizers, retarders, e.g. acidic substances, such as hydrochloric acid or organic acid halides, or else cell regulators of the type known per se, for example paraffins or fatty alcohols, and dimethylpolysiloxanes, or else pigments or dyes, and other flame retardants of the type known per se, or else stabilizers to protect from the effects of aging and weather, plasticizers, and substances with fungistatic or bacteriostatic action, or else fillers, such as barium sulfate, Kieselguhr, carbon black, or precipitated chalk (DE-A 2732292).
- surface-active additives such as emulsifiers and foam stabilizers
- retarders e.g. acidic substances, such as hydrochloric acid or organic acid halides
- cell regulators of the type known per se for example paraffins or fatty alcohols,
- the methods for the production of the flexible polyurethane foams of the invention are known per se.
- the components for the reaction may be reacted by the single- stage process known per se, the prepolymer process, or the semi-prepolymer process. Details of foam manufacture are found, for example, in Kunststoff- Handbuch [Plastics Handbook], Volume VI, Carl Hanser Verlag, Kunststoff, 1993.
- the flame retardant flexible polyurethane foams according to the invention may be produced by a continuous or batchwise method, or as foamed moldings. Preference is given to flexible foams produced by a slab foaming process.
- Examples of applications of the flame retardant flexible polyurethane foam of the invention are: furniture padding, textile inserts, mattresses, automobile seats, armrests, headrests, and construction components, and also automotive seat coverings (seat liners), headliners and dashboard coverings. These uses form also part of the invention.
- Hydrolytic stability of the flame retardants was determined by measuring the development over time of the acid number of blends of polyols with the flame retardants and water during storage at increased temperature.
- 90 g of polyol, 9 g of FR (10 wt.-%) and 4,5 g of water (5 wt.-%) were homogenized by stirring at 1500 rpm for 2 min.
- the acid number was determined using a 3:1 (v/v) isopropanol / water mixture as solvent and 0.1 N NaOH (aq) solution as titration agent.
- the samples were then stored at 40 °C and the acid numbers were determined after given periods of time. Samples were homogenized before analysis by stirring at 1500 rpm for 2 min.
- the acid number development of polyol-water blends without added FR was determined (Comp. Example 1 and Comp. Example 3).
- Table 1 Hydrolytic stability test: Development of the acid number of mixtures of polyols with 10 wt.-% of flame retardant and 5 wt.-% of water during storage at 40°C.
- Table 1 shows that the acid number increase of water-containing polyol blends with FR3 (Example 1 and Example 2) is not significantly higher than for the water- containing polyols without flame retardant (Comp. Example 1 and Comp.
- Example 3 demonstrating high hydrolytic stability of BMPO-based flame retardants like FR3 during storage in the polyols.
- an acid value of 0.1 mg KOFI/g was found for the water-containing polyol Arcol ® 1104 (polyether polyol, Comp. Example 1 ), and of 0.5 mg KOFI/g with added FR3 (Example 1 ).
- These results show only a negligible degree of hydrolysis of FR3.
- the Arcol ® 1104 blend containing Exolit OP 550 (Ref-2) shows a significantly increased acid value of > 40 mg KOFI/g after 11 d already, which can be explained by hydrolysis of the flame retardant (Comp. Example 2).
- BMPO-based flame-retardants as FR3 is beneficial for typical applications of reactive flame retardants like automotive flexible polyurethane foam, because pre blends of polyols and other polyurethane foam ingredients including flame 33 retardants and water are required not to undergo hydrolysis before the foam production step (mixing with isocyanates) for as long as possible.
- Ref-2 shows a marked rise of acid number at same conditions (94.7 mg KOH/g after 28 d) indicating fast hydrolysis of this material in water-containing systems.
- Polyol, additives, catalysts, stabilizer and blowing agent are weighed into a dry beaker and premixed for 60 s at 500 rpm (for polyether polyol formulations) and 1000 rpm (for polyester polyol formulations), respectively.
- TDI tolyl diisocyanate
- the mixtures are homogenized for 7 s at 2500 rpm.
- the resulting mass is rapidly poured into a paper-wrapped box mould (25*26*26 cm). Rise time and further observations are noted during the foaming process.
- the foams are cured at room temperature for approx. 16 h before cutting and further evaluation.
- Table 2 Flexible polyurethane foam formulations. Amounts of all components are given in parts per 100 parts of polyol (php)
- the efficiency of the flame retardants was evaluated by testing the burning behavior of flexible polyurethane foam samples with a target density of 30 kg/m 3 , containing the flame retardants in the horizontal burn test, as described in the Federal Motor Vehicle Safety Standard 302 (FMVSS 302). According to this standard, samples are given the highest classification (SE, “self-extinguishing”) if the flame does not travel beyond a 38 mm mark on the specimen but extinguishes within this distance. Lower classifications include SE/NBR (self-extinguishing/no burn rate), SE/B (self-extinguishing/burn rate) and B (burn rate). Five sample specimens were cut from each foam and submitted to the test. The lowest-rated specimen determined the overall classification for the foam.
- SE self-extinguishing
- Compression set is the relative ratio of sample thickness after recovery from compression and initial sample thickness under defined parameters. The test is carried out with untreated and humid-aged samples. It is an important quality parameter for flexible polyurethane foam, e.g. for automotive or furniture applications, ensuring stable mechanical properties during prolonged storage under compression under adverse climate conditions.
- Compression set is calculated as follows:
- FOG condensable condensable emissions
- VOC volatile organic compounds
- DIN 75201 B A sample is heated to 100 °C for 16 h in a specialized device, while semi-volatile components of the emissions are condensed on a cooled surface and quantified gravimetrically.
- VOC emissions can be quantified by thermodesorption analysis according to the automotive standard VDA 278.
- thermodesorption tube A sample in a thermodesorption tube is heated to 90 °C for 30 min, and condensates are collected in a cooling trap before being identified and quantified via GC/MS against an external standard like toluene.
- the emission performance of the new flame retardant described herein was evaluated by determining both FOG and VOC emissions according to these procedures.
- Table 3 also shows that SE-ratings in the FMVSS 302 test can be achieved with significantly lower dosages of 4 php with the reactive flame retardants Ref-2, FR2 and FR3 (Comp. Example 6, Example 6 and Example 3), compared to the reference foam in Comp. Example 5, which needed 12 php of TCPP as flame retardant to achieve an SE rating. A lower flame retardant efficiency compared to FR3 was found for FR6. As shown in Example 4, a dosage 7 php was required to obtain a foam with an SE rating in the FMVSS 302 test. This inferior flame retardancy performance compared to the foams in Comp.
- Example 6 and Example 3 can be explained with lower solubility of FR6 in the polyol system, leading to partial demixing and an inhomogenous phosphorus distribution in the foam. This trend can also be seen for FR5, for which formulations with an FR dosage of 4 php only achieved an SE/NBR rating (Example 8). 40
- Flame retardants FR2, FR3 and FR6, as well as reference reactive flame retardant Ref-2 allow the production of open-cell foams, which can be seen from good air permeability results in Example 6, Example 3, Example 4 and Comp. Example 6.
- Low air permeability values indicate that low pressure is required for air to pass through the foam samples, as a result of a highly open-cell foam structure.
- the air permeability for the foams in Example 6, Example 3 and Example 4 (containing FR2, FR3 and FR6) are in the range of the TCPP-containing reference foam Comp. Example 5, demonstrating that the cell-closing property often associated with reactive flame retardants is low for flame retardants according to the invention.
- This property of the flame retardants according to the invention is beneficial in the industrial production of flexible polyurethane foam, as it facilitates formulation of open-cell foams with reactive flame retardants.
- Table 3 futhermore shows that very low values of compression set can be achieved when flame retardants according to the invention are used, e.g. FR2,
- FR3 or FR6 Low compression set values are beneficial for typical applications like automotive headliner foam, which is usually compressed during storage and transport, and which needs to fully decompress according to OEM requirements.
- the compression set found for foams in Example 3, Example 4 and Example 6 (containing FR3, FR6 or FR2) are similarly low as the value found for the TCPP- containing reference foam in Comp. Example 5.
- Compression set is negatively influenced by ageing under humid conditions, due to hydrolytic cleavage of polymer chains. This is particularly the case for foams containing reactive flame retardants, that can act as breaking points in the polymer backbone if they are not hydrolytically stable.
- the good compression set values observed for the foams in Example 3, Example 4 and Example 6 can be explained with the high hydrolytic resistance of the phosphine oxide group as also demonstrated for FR3 in Example 1.
- table 3 illustrates that foams containing flame retardants according to the invention are clearly advantageous in applications requiring low emissions of volatile compounds from the final material, e.g. automotive interior materials like polyurethane foam for head- and seatliners.
- Foams containing flame retardants 41 according to the invention FR1-F6 showed very low fogging values ranging between 0,1 and 0,3 mg.
- VDA-278 emission values were dramatically lower than for the TCPP-containing reference foam Comp. Example 5, and significantly lower than for the reference foam in Comp. Example 6.
- these examples demonstrate that the flame retardants according to the invention provide a clear benefit over existing alternatives like reference flame retardants Ref-1 and Ref-2, as they allow polyurethane foam manufacturers to produce flame retarded foams with an open-cell structure, low compression set and very low emission values all at the same time, without using halogenated flame retardants.
- Example 9 containing flame retardant FR3 was compared with reference foams using TDCPP and Exolit OP 550 as flame retardants (Comp. Example 8 and Comp. Example 9).
- the foams were produced according to the procedure described above for polyether-based polyurethane foams. The detailed compositions of these formulations are provided in table 2, the performance data is summarized in table 3.
- Example 9 Comp. Example 8 and Comp. Example 9 also demonstrate the benefit of the reactive properties of the flame retardants according to the invention. As can be seen from the fogging values in table 3, the foams containing reactive flame retardants Ref-2 and FR3 lead to significantly lower condensable emissions, compared to the additive flame retardant Ref-4 in Comp. Example 8.
- Example 9 also shows the advantage of the flame retardants according to the invention over other reactive flame retardants like Ref-2 in Comp. Example 9, in terms to the resistance against hydrolysis.
- the results for compression set after ageing are considerably better for Example 9 (containing FR3) and Comp.
- Example 8 (containing Ref-4), than Comp.
- Example 9 (containing Ref-2). This is in line with the higher resistance to hydrolysis in water-containing polyol blends, demonstrated for FR3 in Example 2.
- flame retardants according to the invention can be used for the production of flexible polyester-based flame retardant polyurethane foams which show beneficial emission characteristics and have improved resistance against hydrolysis compared to foams using other reactive flame retardants, at the same time avoiding halogenated flame retardants.
Abstract
Discosed are flexible polyurethane foams comprising flame-retardant polyurethanes which comprise structural units of formula (X) and/or (XI) wherein R1 is a monovalent organic group, R2, R3, R4 and R5 independently of one another are hydrogen, alkyl groups having between one and eight carbon atoms or aryl groups having between six and eighteen carbon atoms, R6 and R7 independently of one another are hydrogen or a group of formula (XII) R8 is hydrogen or a group of formula (XII), n and m independently of one another are integers between 0 and 10, o, p and q independently of one another are integers between 0 and 5, with the proviso that the number of structural units of formula (a) in the structural units of formula (XI) is between 1 and 20. The flexible polyurethane foams show besides flame-retardancy low VOC emission as well as non-hydrolyzing, high compatibility and open-pore-foam-forming properties.
Description
1
Flexible foams comprising flame-retardant polyurethane, a process for their production and use thereof
The invention relates to flexible foams comprising flame-retardant polyurethanes with high aging resistance, a process for their production and to their use, e.g. for the manufacture of molded bodies.
Polyurethane foams are plastics used in many sectors, for example furniture, mattresses, transport, construction, and technical insulation applications. To comply with stringent fire-protection requirements such as those demanded for materials used, inter alia, in the interior fitting-out of automobiles, of rail vehicles, or of aircraft, or materials used to insulate buildings, polyurethane foams generally have to be provided with flame retardants. A wide variety of flame retardants are known and are commercially available for this purpose. However, their use is often inhibited by considerable technical usage problems and/or toxicological concerns.
For example, when solid flame retardants are used, e.g. melamine, ammonium polyphosphate, and ammonium sulfate, problems arise with metering techniques and often necessitate modifications to the foaming plants, i.e. complicated changes in design and modifications. Many of the liquid flame retardants used, for example tris(2-chloroethyl)phosphate and tris(2-chloroisopropyl)phosphate, are characterized by a marked tendency toward migration, which limits their usefulness in open-cell flexible polyurethane foam systems for the interior fitting- out of automobiles, in the light of requirements relating to condensable emissions (fogging).
Halogen-free flame-retardant systems are also preferred on grounds of environmental toxicology, and on grounds of improved ancillary properties in the event of a fire, in terms of smoke density and smoke toxicity. Halogen-free flame retardants can also be of particular interest for performance-related reasons. For example, when halogenated flame retardants are used severe corrosion is observed on the plant components used for the flame-lamination of polyurethane
2 foams. This can be attributed to the hydrohalic acid emissions arising during the flame-lamination of halogen-containing polyurethane foams.
Flame-lamination is the term used for a process for bonding of textiles and foams, by using a flame to melt one side of a foam sheet, and then immediately pressing a textile web onto the same.
Because increasing attention is being paid to gaseous emissions (volatile organic compounds=VOC), there is also an increase in requirements for flame retardants which resist migration.
Materials which have high resistance to migration are hydroxy-containing oligomeric phosphoric esters (DE-A 4342972) and hydroxyalkyl phosphonates (DE-A 19927548).
From the prior art phosphine oxide compounds are known exhibiting flame retardancy, but low compatibility with the polymer system, thus being technically unfeasible in such applications.
Reactions between tris-(chloromethyl)- and bis-(chloromethyl)methyl phosphine oxide with vicinal diols are disclosed by G. Borisov at al. in Phosphorus and Sulfur, 1984,Vol. 21, pp. 59-65. The products are linear or cyclic. As linear products bis- (ethylene glycol)methyl phosphine oxide and bis-(propylene glycol)methyl phosphine oxide are disclosed. These compounds are characterized by boiling point, melting point and refractive index. No mixtures of different phosphine oxides and no applications for these compounds are disclosed.
US 3,445,405 discloses flame-resistant polyurethane compositions which are produced by using condensation products of at least one alkylene oxide and tris(hydroxymethyl)phosphine oxide in the reaction involving a polyisocyanate and a polyether polymer. In this document tris-functionalized phosphine oxides are disclosed as flame retardants for polyurethanes.
3
US 5,985,965 A discloses flame-resistant poulyurethanes. These contain mixtures of oligomeric phosphoric acid esters which carry hydroxyalkoxy groups. No phosphine oxides are mentioned herein.
From CN 105801833 A1 reactive halogen-free flame-retardant polyether polyols are known. These are prepared from trimethylol phosphorus oxide by addition reaction with propylene oxide / ethylene oxide. The product is a polyvalent reactive halogen-free flame-retardant polyether which can be used in the manufacture of flame-retardant rigid foam materials. In this document tris-functionalized phosphine oxides are disclosed.
K. Zhang et al. in Journal of Applied Polymer Science, 135(5), 1-10 (2018) disclose a flame retardant polyurethane foam prepared from compatible blends of soybean oil-based polyol and phosphorus containing polyol. The phosphorus containing polyether polyol was synthesized by polymerization between tris- (hydroxymethyl) phosphine oxide and propylene oxide. A soybean oil-based polyol was synthesized from epoxidized soybean oil by ring-opening reaction with lactic acid. Polyurethane foams were prepared by mixing soybean oil-based polyol with phosphorus containing polyether polyol. Several properties of the polyurethane foams, such as their density and thermal degradation property were investigated.
One major application for flame retarded flexible polyurethane foams is seat liners and head liners in the automotive sector. However, technical demand is not limited to flame retardancy, but another very important demand from the industry - and ultimately from the end-customer - is a very low emission of volatile organic substances (VOC), which can be harmful. Typically, flame retardants are small and unreactive molecules with a tendency to migrate and evaporate, i.e. leading to leaching and emission of VOC. There are two concepts on to achieve the demand for low emission by either employing reactive or polymeric flame retardants or small reactive molecules. The latter having the advantage of being usually less viscous and thus easier to process.
4
Additionally, the molecular architecture can play a decisive role in foam production. In fact, for flexible foam a low cross-linking density is mandatory to allow a defect-free formation of an open-porous structure of the foam. The phosphine oxides disclosed in the prior art for polyurethane foam applications have one major drawback of being three-functional (i.e. each molecule carrying three hydroxy groups) thus each acting as a cross linker in the polymerization reaction (see e.g. US 3,445,405 A or CN 105801833 A or K. Zhang et al. article mentioned above).
US 6,380,273 B1 discloses a process for the production of polyurethane foams containing halogen-free flame retardants and having high oxidative thermal resistance during foaming. The process is usable for the manufacture of flexible ester and ether foams and for rigid foams and facilitates the production of polyurethane foams having low fogging values. Moreover, the process gives polyurethane foams having high aging resistance of the flame resistance, i.e. the polyurethane foam still has effective flame resistance after corresponding storage duration, even at elevated temperature. The disclosed process for the production of flame-resistant flexible polyurethane foams having a low susceptibility to core discoloration comprises employing hydroxyalkyl phosphonates as halogen-free flame retardants and as core discoloration inhibitors.
US 2001/0034388 A1 discloses a halogen-free, water-blown, flame-retardant rigid polyurethane foam which meets the necessary and prescribed requirements for flame retardancy, ease of production, low smoke density and low smoke toxicity. The polyurethane foam described in this document comprises oxalkylated alkyl- phosphonic acids as a flame retardant.
US 2004/0077741 A1 discloses flame-retardant flexible polyurethane foams with high aging resistance, and a process for their production. This document describes low-emission polyurethane foams having reduced halogen content, which when compared with a halogen-free flame-retardant polyurethane foam, has improved resistance to hydrolysis aging, and, when compared with a prior-art polyurethane foam, has lower halogen content. The flame-retardant flexible polyurethane foams
5 disclosed in this document comprise a mixture composed of hydroxyalkyl phosphonates and chlorinated phosphoric esters.
A disadvantage frequently found in the polyurethane foams known hitherto is that although the use of reactive, liquid halogen-free flame retardants achieves a high level of flame retardant action, in particular in the case of the phosphoric esters mentioned in DE-A 4342972 and the phosphonic esters mentioned in DE-A 19927548, a marked plasticizing action arises at the same time, and the resultant polyurethane foam is highly susceptible to hydrolysis, and therefore the mechanical properties of the foam have only low resistance to hydrolysis aging.
Although resistance to hydrolysis aging can be improved by using halogen- containing flame retardants, the result is then, inter alia, that the disadvantages described above for halogen-containing flame retardants have to be accepted in relation to smoke toxicity, smoke density, and formation of halogen-containing cleavage products.
Due to growing environmental and health concerns, some widely used halogenated phosphorus-based flame retardants for polyurethane applications like tris(2-chloroisopropyl)phosphate (TCPP) and tris(1 ,3-dichloroisopropyl)phosphate (TDCPP) are under regulatory scrutiny. While some of these flame retardants have already been banned in certain applications and regions, others are still being used, but alternatives are being sought after. Since most polyurethane materials are intrinsically flammable, flame retardants are needed in various applications, e.g. in upholstery and furniture, in transportation applications such as automotive, railway or aviation interior, or in building insulation.
Halogenated phosphorus-based flame retardants can be replaced with non- halogenated alternatives, e.g. various triarylphosphates like triphenylphosphate (TPP) or mixtures of alkylated aryl phosphates. While some of these avoid major problems of halogenated flame retardants - like regular scrutiny or formation of corrosive gases in the flame lamination process commonly used in the production of automotive head- and seat liner - there are still significant disadvantages. It is
6 known that additive flame retardants such as triarylphosphates can migrate and leach out of polyurethane foams, leading to significant health concerns and often to unwanted emission of organic compounds. Low-emission materials are particularly important for automotive applications, where limits are defined in standards like testing VDA-278 (emission of volatile organic compounds, VOC) and DIN 75201 B (condensable emissions, “fogging”). Other areas with low- emission requirements include consumer applications like mattresses and furniture.
There are several ways of avoiding unwanted emissions from polyurethane materials caused by flame retardants and other additives. A safe and proven way is to use reactive flame retardants, which usually bear hydroxyl groups, but might also contain other functional groups with active hydrogen atoms. These flame retardants will react with isocyanate groups present during the polyurethane manufacturing process, forming covalent bonds and thus permanently binding the flame retardant to the polymeric backbone. These covalent bonds effectively prevent migration and leaching of the flame retardant from the polyurethane material.
While very good emission properties can be achieved this way, most reactive flame retardants also pose additional challenges: Many phosphorus-based compounds are prone to hydrolysis in the presence of water, particularly at elevated temperatures. In case of reactive flame retardants, which have become part of the polymer backbone, this behavior leads to material deterioration (loss of mechanical properties), as hydrolysis leads to breakages in the polymer chains. In many key applications (e.g. automotive interior), there are increasingly stringent testing methods to guarantee long-term ageing stability of the materials under humid conditions. Hydrolytic instability also causes flame retardants to be incompatible with many polyurethane systems. This means preformulated, water- containing polyol blends containing such compounds cannot be stored for prolonged time, as decomposition products yielded by hydrolysis can deactivate catalysts usually present in most PU systems. Such flame retardants rather need to be added shortly prior to foaming, or in situ.
7
Thus, there is a strong demand for efficient non-halogenated and hydrolytically stable flame retardants that allow meeting stringent emission standards.
It is an object of the present invention to provide halogen-free flame-retardant flexible polyurethane foams having low VOC emission as well as non-hydrolyzing, high compatibility and open-pore-foam-forming properties. Said compounds shall have these different properties in one single compound.
Another object of the present invention is the provision of a flame-retardant flexible polyurethane foam having an excellent flame-retardancy combined with very low VOC emission as well as resistance against hydrolysis when subjected to high temperatures.
These objects are achieved by providing flexible polyurethane foams comprising selected phosphine oxide compounds as flame-retardants.
The present invention relates to flexible polyurethane foams which comprise at least one flame retardant polyurethane comprising structural units of formula (X) and/or (XI)
wherein
R1 is a monovalent organic group,
8
R2, R3, R4 and R5 independently of one another are hydrogen, alkyl groups having between one and eight carbon atoms or aryl groups having between six and eighteen carbon atoms,
R8 is hydrogen or a group of formula (XII), n and m independently of one another are integers between 0 and 10, o, p and q independently of one another are integers between 0 and 5, with the proviso that the number of structural units of formula
in the the structural units of formula (XI) is between 1 and 20.
The flame retardant polyurethanes used in the flexible polyurethane foams of the present invention usually comprise besides the structural units of formula (X) and/or (XI) structural units derived from polyisocyanates and structural units derived from compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) defined below.
Structural units derived from polyisocyanates are those which are in general derived from di- or tri-isocyanates. These structural units have the formula (XV)
-0-C0-NH-PIC-(NH-C0-0)t- (XV)
9 wherein PIC is a di- or trivalent organic residue, preferably a di- or trivalent aliphatic, cycloaliphatic or aromatic hydrocarbon residue, and t is 1 or 2.
Structural units derived from compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I),
(II) and (VI) are di- or trivalent organic residues, preferably di- or trivalent aliphatic, cycloaliphatic or aromatic hydrocarbon residues.
Preferably, structural units derived from polyisocyanates and structural units derived from compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) form recurring structural polyurethane unists of formula (XVI)
-O-CO-NH-PIC-NH-CO-O-DIOL- (XVI) wherein PIC and DIOL independently of one another are divalent organic residues, preferably divalent aliphatic, cycloaliphatic and/or aromatic hydrocarbon residues.
Preferred flexible polyurethane foams of this invention comprise a flame-retardant polyurethane comprising structural units of formula (X), preferably a flame- retardant polyurethane comprising a mixture of different structural units of formula (X).
Preferred flexible polyurethane foams of this invention comprise a flame-retardant polyurethane comprising structural units of formula (X), wherein one of R2 or R3 is hydrogen and the other one of R2 or R3 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms and wherein one of R4 or R5 is hydrogen and the other one of R4 or R5 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms.
10
More preferred are flexible polyurethane foams comprising a flame-retardant polyurethane comprising structural units of formula (X), wherein one of R2 or R3 is hydrogen and the other one of R2 or R3 is hydrogen or an alkyl group having between one and two carbon atoms, preferably methyl, and wherein one of R4 or R5 is hydrogen and the other one of R4 or R5 is hydrogen or an alkyl group having between one and two carbon atoms, preferably methyl.
Still more preferred are flexible polyurethane foams comprising a flame-retardant polyurethane comprising structural units of formula (X), wherein R2, R3, R4 and R5 independently of one another are selected from hydrogen, Ci-C6-alkyl and phenyl, more preferred from hydrogen and Ci-Ce-alkyl, and still more preferred from hydrogen and Ci-C3-alkyl, and most preferred from hydrogen and methyl.
In these preferred flexible polyurethane foams flame-retardant polyurethanes comprising at least two different structural units of below defined formula (Xa) may be present, or at least two different structural units of below defined formula (Xb), or at least two different structural units of below defined formula (Xc), or at least two structural units of belos defined formulae (Xa) and (Xb), or at least two structural units of below defined formulae (Xa) and (Xc), or at least two structural units of below defined formulae (Xb) and (Xc).
Very preferred are flexible polyurethane foams comprising flame-retardant polyurethanes comprising structural units of formula (X), wherein R2, R3, R4 and R5 independently of one another are selected from hydrogen, Ci-C6-alkyl and phenyl, more preferred from hydrogen and Ci-Ce-alkyl, and still more preferred from hydrogen and Ci-C3-alkyl, and most preferred from hydrogen and methyl.
These preferred flame-retardant polyurethanes comprise at least two different structural units of formula (Xa), (Xb) and/or (Xc)
11
wherein
R1, m and n are as hereinbefore defined,
R2a and R3a independently of one another is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon, and R4a and R5a independently of one another is an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon.
Other preferred flexible polyurethane foams comprise at least one flame-retardant polyurethane comprising structural units of formula (X) and/or of formula (XI), wherein R1 is Ci-Ce-alkyl, cyclohexyl or phenyl, preferred Ci-C3-alkyl, and most preferred methyl.
Still other preferred flexible polyurethane foams comprise flame-retardant polyurethanes comprising structural units of formula (X), wherein the sum n+m is a number between 1 and 15 and most preferred between 4 and 12.
Other preferred flexible polyurethane foams comprise flame-retardant polyurethanes comprising at least one structural unit of formula (XI), preferably
12 different structural units of formula (XI), wherein R1 is Ci-Ce-alkyl, cyclohexyl or phenyl, preferred Ci-C3-alkyl, and most preferred methyl, and wherein the number of structural units of formula
is between 1 and 10.
Unless otherwise indicated, the term "monovalent organic group" as used herein includes a monovalent organic radical derived from an organic group by removal of one hydrogen atom. Organic groups may be saturated or unsaturated straight- chain, branched-chain or mono- or multicyclic hydrocarbons or saturated or unsaturated heterocyclic groups, having - besides the ring carbon atoms - one or more ring-heteroatoms, such as oxygen, nitrogen or sulfur.
Unless otherwise indicated, the term "alkyl" as used herein includes a saturated monovalent aliphatic hydrocarbon radical with straight or branched moieties, preferably a Ci-Ci2-alkyl radical and most preferred a Ci-C6-alkyl radical. Examples of alkyl radicals are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl or hexyl, preferably methyl or ethyl and most preferred methyl.
Unless otherwise indicated, the term "alkylene" as used herein includes a saturated divalent aliphatic hydrocarbon radical with straight or branched moieties, preferably a C2-Ci2-alkylene radical and most preferred a C2-C6-alkylene radical. Examples of alkylene radicals are ethylene, propylene, isopropylene, butylene, isobutylene, tert-butylene, pentylen or hexylene, preferably ethylene, propylene, isopropylene or butylene and most preferred ethylene, propylene or isopropylene.
13
Unless otherwise indicated, the term "cycloalkyl" as used herein includes a cyclic saturated monovalent hydrocarbon radical with five to seven ring carbon atoms. An example of a cycloalkyl group is cyclohexyl.
Unless otherwise indicated, the term "aryl" as used herein includes an aromatic radical derived from an aromatic hydrocarbon by removal of one hydrogen, such as, but not limited to, phenyl or naphthyl.
Unless otherwise indicated, the term "aralkyl" as used herein signifies an "aryl- alkyl-" group such as, but not limited to: benzyl (C6H5-CH2-) or methylbenzyl (CH3-C6H4-CH2-).
Unless otherwise indicated, the term "alkylaryl" as used herein signifies an "alkyl- aryl-" group such as, but not limited to: methylphenyl (CH3-C6H4-), dimethylphenyl ((CH3)2-C6H3-) or isopropylphenyl ((CH3)2C-C6H4-).
R1 is a monovalent organic group. This is preferably selected from alkyl, cycloalkyl, aryl, aralkyl or alkylaryl, more preferred selected from Ci-Ce-alkyl, cyclohexyl or phenyl. Still more preferred R1 is Ci-C3-alkyl, most preferred methyl.
Examples of R1 are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, cyclohexyl or phenyl.
R2, R3, R4 and R5 independently of one another are hydrogen, alkyl groups having between one and eight carbon atoms or aryl groups having between six and eighteen carbon atoms,
R2, R3, R4 and R5 preferably are selected from hydrogen, C-i-Cs-alkyl and phenyl, more preferred from hydrogen and Ci-Ce-alkyl, and still more preferred from hydrogen and Ci-C3-alkyl, and most preferred from hydrogen and methyl.
Examples of R2, R3, R4 and R5 as C-i-Cs-alkyl are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, heptyl and octyl.
14
Preferred examples of R2 and R3 or of R4 and R5 are Ci-C6-alkyl or phenyl. Still more preferred one of R2 and R3 of R4 and R5 and one of of R4 and R5 is hydrogen and the other one is Ci-C3-alkyl, most preferred methyl.
R6, R7 and R8 independently of one another are hydrogen or a group of formula (XII) which is derived from glycidol.
The chain length of the alkylene oxide units in the individual groups of formulae (X) and (XII) in the flame-retardant polyurethane is characterized by integers n and m or o and p.
The chain length of the alkylene oxide units in the individual structural units of formula (X) is characterized by integers n and m.
Integers m and n independently of one another have values between 0 and 10, preferably between 1 and 10 and more preferred between 1 and 8 and still more preferred between 2 and 6.
The structural units of formula (X) in a flame-retardant polyurethane may differ in the nature of the groups R1 to R5 and/or in the number of recurring units characterized by integers m and n.
Preferred flame-retardant polyurethanes comprise structural units of formula (X) with the same groups R1 to R5 which differ in the values of n and/or m, more preferred in the values of (n+m).
In a flame-retardant polyurethane comprising structural units of formula (X) the sum n+m of a single structural unit in said polyurethane is a number between 0 and 20, preferably between 1 and 15 and most preferred between 4 and 12.
Preferably flame-retardant polyurethanes are used comprising at least two different structural units of formula (X). More preferred, these flame-retardant
15 polyurethanes comprise different structural units of formula (X) in a molecule, for example structural units of formulae (Xa), (Xb) and/or (Xc) mentioned above.
The alkylene oxide moieties in the single structural units of formula (X) of the flame-retardant polyurethanes may have different chain lengths (= different values of n and/or m or of the sum of m+n).
Examples of preferred flame retardant polyurethanes comprising structural units of formula (X) are polyurethanes comprising at least two different phosphine oxide structural units of formulae (Xe), (Xf) and/or (Xg)
wherein
R8 is Ci-C6-alkyl, preferably methyl,
R9 and R10 independently of one another are hydrogen, C-i-Cs-alkyl or C6-C18- aryl, preferably hydrogen, Ci-C6-alkyl or phenyl, most preferred hydrogen or methyl, n and m independently of one another are integers between 0 and 10, preferably between 1 and 10, and wherein the sum n+m is a number between 0 and 20, preferably between 1 and
15.
16
Flame-retardant structural units of formula (XI) are derived from methylol-organyl- phosphine oxides and glycidol.
The chain length of the glycidol units in the individual structural units of formula (XI) is characterized by integers o, p and q.
Integers o, p and q independently of one another have values between 0 and 5, preferably between 1 and 5 and more preferred between 1 and 3 and still more preferred between 2 and 3.
The single structural units of formula (XI) in a flame-retardant polyurethane may differ in the nature of the groups R1 and R6 to R8 and/or in the number of recurring units characterized by integers o, p and q.
Preferred flame-retardant polyurethanes comprise different structural units of formula (XI) with the same groups R1 which differ in the values of o, p and/or q.
In a preferred flame-retardant polyurethane comprising structural units of formula (XI) the sum o+p+q of a single structural unit in said polyurethane is a number between 2 and 20, preferably between 3 and 15 and most preferred between 4 and 12.
In another preferred embodiment of the present invention the flame-retardant polyurethane used in the flexible polyurethane foams comprises besides structural units of formula (X) or (XI) as hereinbefore described, at least one structural unit of formula (Via)
17
wherein
R2, R3, R4, R5, m and n are defined as above,
R14 and R15 independently of one another are hydrogen, alkyl groups having between one and eight carbon atoms or aryl groups having between six and eighteen carbon atoms, and r independently of n and m is an integer between 0 and 10, preferably between 1 and 10.
Very preferred flame-retardant polyurethanes comprise at least one structural unit of formula (Via) besides at least one structural unit of formula (X), wherein one of R2 or R3 is hydrogen and the other one of R2 or R3 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms and wherein one of R4 or R5 is hydrogen and the other one of R4 or R5 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms and wherein one of R14 or R15 is hydrogen and the other one of R14 or R15 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms.
Still more preferred flame-retardant polyurethanes comprise at least two different structural units of formula (X) and at least one structural unit of formula (Via).
18
Structural units of formula (Via) are similar to structural units of formula (X), but the former carries a group -0-(CHR14-CHR15-0)r-H instead of a group R1 (= trifunctional compounds carrying three alkylene oxide groups).
Preferably, the content of bifunctional structural units of formulae (X) and/or of formula (XI) is from 50 to 100, more preferred from 90 to 100 and still more preferred from 90 to 99.5 mol %, referring to the total content of structural units of formulae (X), (XI and (Via) in a molecule.
Preferably, the content of trifunctional structural units of formula (Via) is from 50 to 0, more preferred from 10 to 0 and still more preferred from 10 to 0.5 mol %, referring to the total content of structural units of formulae (X), (XI) and (Via) in a molecule.
Flame-retardant polyurethanes comprising structural units of formula (X) and/or (XI) and optionally (Via) may be prepared by standard reactions known to the skilled artisan.
Thus, organic polyisocyanates are reacted with compounds of formula (I) and/or (II) and optionally (VI) together with compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds from formulae (I), (II) and (VI)
19
wherein
R1, R2, R3, R4, R5, R6, R7, R14, R15, m, n, o, p and r are defined as above.
The compounds of formula (I), (II) or (VI) may be prepared by standard reactions known to the skilled artisan.
Alkylene oxides of formula (I) may be produced by reacting bis-methylol- phosphine oxide of formula (VII) with one or more epoxides of formula (VIII)
wherein R1, R2 and R3 are as defined hereinbefore.
Phosphine oxide glycidol compounds of formula (II) may be produced by reacting bis-methylol-phosphine oxide of formula (VII) with glycidol of formula (IX)
wherein R1 is as defined hereinbefore.
20
Alkylene oxides of formula (VI) may be produced by reacting tris-methylol- phosphine oxide with one or more epoxides of formula (VIII).
The amounts of bis- or tris-methylol-phosphine oxide and epoxides or glycidol are selected in a manner so that the desired number of recurring alkylene oxide units or glycidol units is obtained.
The reaction between bis- or tris-methylol-phosphine oxide and epoxides or glycidol may be initiated by mixing said compounds and by heating these compounds in the presence of a basic compound, for example an alkali hydroxide, such as sodium hydroxide or potassium hydroxide. The reaction temperature may be varied in a broad range, for example between 50 and 200°C. During reaction the reaction mixture is preferably agitated, e.g. by using a stirrer.
The reaction may be carried out at atmospheric pressure, preferably at reduced pressure, for example in the pressure range between 1 and 105 Pa, preferably between 10 and 104 Pa.
The reaction may also be carried out in solution using an organic solvent which is inert under reaction conditions. Examples of solvents are aprotic organic solvents, such as dimethyl sulfoxide, dimethyl formamide or dimethyl acetamide, or aromatic hydrocarbons, such as benzene, toluene or xylene.
Phosphine oxide starting materials of formula (VII) or tris-methylol-phosphine oxide starting materials are known compounds or can be produced using standard procedures of phosphorus-organic chemistry.
Epoxy starting materials of formulae (VIII) and (IX) are known compounds or can be produced using standard procedures of organic chemistry.
Examples of preferred epoxy starting materials are ethylene oxide, propylene oxide, styrene oxide or glycidol.
21
Surprisingly, it has been found that flexible polyurethane foams can be manufactured from flame-retardant polyurethanes comprising structural units of formula (X) and/or (XI) and optionally (Via) derived from alkoxylated phosphine oxide compounds of formula (I) and/or (II) and optionally (VI). Single compounds of formula (I) or (II) or mixtures of different compounds of formula (I) or of formula (II) or mixtures of compounds of formulae (I) and (II) or mixtures of compounds of formulae (I) and (VI) or mixtures of compounds of formulae (II) and (VI) or mixtures of compounds of formulae (I), (II) and (VI) may be used in the manufacture of flame-retardant polyurethanes used in the flexible foams of this invention.
The invention also relates to a kit-of-parts comprising a container A containing an organic polyisocyanate or a mixture of organic polyisocyanates, and comprising a container B containing a mixture of compounds of formula (I) and/or (II) and optionally (VI) together with compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I),
R1, R2, R3, R4, R5, R6, R7, R14, R15, m, n, o, p and r are as defined above.
In a preferred embodiment of the kit-of-parts the compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) are selected from the group consisting of polyalkylene ether polyols, polyester polyols and hydroxyl-terminated elastomers.
In another preferred embodiment of the kit-of-parts the compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) are low-molecular weight polyols.
Surprisingly, a compound of formula (I) and/or (II) optionally together with a compound of formula (VI) when incorporated into a polyurethane molecule provides excellent flame-retardancy combined with very low VOC emission as well as resistance against hydrolysis when subjected to high temperatures. Furthermore, flexible polyurethane foams comprising flame-retardant polyurethanes comprising structural units derived from compounds of formula (I) and/or (II) and optionally (Via) show an excellent extrudability and moldability in different plastic articles.
The amount of structural units of formula (X) and/or of formula (XI) and optionally of formula (Via) in a flame-retardant polyurethane used in the flexible foams of this invention may vary in a broad range. Typically, the amount of structural units of
23 formula (X) and/or of formula (XI) and optionally of formula (Via) is from 0.5 to 30 mol.-%, preferably from 0.5 to 20 mol.-% and most preferred from 1 to 10 mol.-%, referring to the total amount of the polyurethane.
The amount of structural units derived from polyisocyanates and from compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) in a flame-retardant polyurethane used in the flexible foams of this invention may also vary in a broad range. Typically, the amount of structural units derived from polyisocyanates and from compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) is from 70 to 99.5 mol.-%, preferably from 80 to 99.5 mol.-% and most preferred from 90 to 99 mol.-%, referring to the total amount of the polyurethane.
The invention also provides a process for preparing flexible polyurethane foams, which comprises reacting organic polyisocyanates with compounds having at least two hydrogen atoms reactive toward isocyanates and being different from compounds of formulae (I), (I) and (VI), with conventional blowing agents, stabilizers, activators, and/or other conventional auxiliaries and additives, in the presence of flame retardants of formula (I) and/or (II) and optionally (VI) defined hereinbefore.
Preferably organic polyisocyanates are reacted with compounds having at least two hydrogen atoms reactive toward isocyanates and being different from compounds of formulae (I), (II) and (VI), with conventional blowing agents, stabilizers, activators, and/or other conventional auxiliaries and additives, in the presence of a flame retardant of formula (I) or of a mixture of of at least two structurally different flame retardants of formula (I), very preferred of formulae (la), (lb) and/or (lc)
24
wherein
R1, m and n are as hereinbefore defined, R2a and R3a independently of one another is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon, and
R4a and R5a independently of one another is an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon.
The flame retardants of formula (I) or (II) or (VI) are compounds reactive toward isocyanates and are incorporated into the polyurethane when reacted with the polyurethane-forming monomers.
The production of flexible foams based on isocyanate is known per se, and is described in DE-A 1694 142, DE-A 1694215, and DE-A 1720768, for example.
25
These are mainly flexible foams containing urethane groups and optionally a lower amount ofallophanate groups and/or urea groups.
Polyurethanes are polymers comprising organic units joined by carbamate (urethane) links. Polyurethanes may be thermosetting polymers that do not melt when heated; but thermoplastic polyurethanes are also available.
Polyurethanes are commonly formed by reacting a di- or triisocyanate with a polyol. Both the isocyanates and polyols used to make polyurethanes contain, on average, two or more functional groups per molecule. Diols and diisocyanates lead to linear polyurethanes, crosslinked polyurethanes can be produced e.g. by converting triisocyanate diisocyanate mixtures with triol-diol mixtures. The properties of polyurethanes can be varied in a wide range. Depending on the degree of cross-linking and/or isocyanate or OH component used, thermosets, thermoplastics or elastomers are obtained. In terms of quantity, polyurethane foams are most important. This invention concerns flexible polyurethane foams. The polyurethanes forming flexible foams are characterized by having soft portions in the molecule. These are derived from a reaction between polyisocyanate and polyalkylene ether polyols, polyester polyols or hydroxyl-terminated elastomers, such as hydroxyl-terminated polybutadienes. Preferably, the polyurethanes forming flexible foams besides soft and flexible portions contain hard and rigid portions in the molecule. These are derived from a reaction between polyisocyanate and low-molecular weight polyols, such as ethylene glycol or propylene glycol.
Starting components for the manufacture of the polyurethanes used for preparing the flexible foams of this invention are, for example, aliphatic, cycloaliphatic, araliphatic, aromatic, or heterocyclic polyisocyanates (e.g. W. Siefken in Justus Liebigs Annalen der Chemie, 562, pp. 75-136), for example those of the formula Q(NCO)s, where s is from 2 to 4, preferably from 2 to 3, and Q is an aliphatic hydrocarbon radical having from 2 to 18, preferably from 6 to 10, carbon atoms, a cycloaliphatic hydrocarbon radical having from 4 to 15, preferably from 5 to 10, carbon atoms, an aromatic hydrocarbon radical having from 6 to 15, preferably
26 from 6 to 13, carbon atoms, or an araliphatic hydrocarbon radical having from 8 to 15, preferably from 8 to 13, carbon atoms.
Suitable polyisocyanates are aromatic, alicyclic and/or aliphatic polyisocyanates having at least two isocyanate groups and mixtures thereof. Preference is given to aromatic polyisocyanates such as tolyl diisocyanate, methylene diphenyl diiso cyanate, naphthylene diisocyanate, xylylene diisocyanate, tris(4- isocyanatophenyl)-methane and polymethylene-polyphenylene diisocyanates; alicyclic polyisocyanates such as methylenediphenyl diisocyanate, tolyl diisocyanate; aliphatic polyisocyanates and hexamethylene diisocyanate, isophorone diisocyanate, dimeryl diisocyanate, 1 ,1-methylenebis(4- isocyanatocyclohexane-4,4'-diisocyanatodicyclohexylmet hane isomer mixture,
1 ,4-cyclohexyl diisocyanate, Desmodur products (Covestro) and lysine diisocyanate and mixtures thereof.
Particular preference is generally given to the polyisocyanates readily available industrially and derived from tolylene 2,4- and/or 2, 6-di isocyanate or from diphenylmethane 4,4'- and/or 2,4'-diisocyanate.
Suitable polyisocyanates are modified products which are obtained by reaction of polyisocyanate with polyol, urea, carbodiimide and/or biuret.
Other starting components for the manufacture of the polyurethanes used for preparing the flexible foams of this invention are compounds having at least two hydroxy groups which starting materials are different from compounds of formulae (I), (II) and (VI). These other starting components preferably have a molecular weight of from 400 to 10,000 ("flexible or soft polyol component"). These have preferably from 2 to 8 hydroxy groups, and specifically those of molecular weight from 1000 to 6000, preferably from 200 to 6000, generally compounds having from 2 to 8, but preferably from 2 to 6, hydroxy groups, these compounds being polyethers and polyesters, or else polycarbonates and polyesteramides, as are known per se for the production of cellular polyurethanes, and as are described in
27
DE-A 2832253, for example. The polyesters and polyethers having at least two hydroxy groups are preferred according to the invention.
Preferred polyesters are polyester polyols which are obtained by polycondensation of a polyalcohol such as ethylene glycol, diethylene glycol, propylene glycol,
1 ,4-butanediol, 1 ,5-pentanediol, methylpentanediol, 1 ,6-hexanediol, trimethylolpropane, glycerol, pentaerythritol, diglycerol, glucose and/or sorbitol, with a dibasic acid such as oxalic acid, malonic acid, succinic acid, tartaric acid, adipic acid, sebacic acid, maleic acid, fumaric acid, phthalic acid and/or terephthalic acid. These polyester polyols can be used alone or in combination.
Other optional starting components for the manufacture of the polyurethanes used for preparing the flexible foams of this invention are compounds having at least two hydroxyl groups and having a molecular weight of from 32 to 399 (“hard polyol component”) which are different from compounds of formulae (I), (II) and (VI). In this case, too, these are compounds having preferably 2 to 8 hydroxyl groups, these compounds serving as chainextenders or crosslinking agents. These compounds generally have from 2 to 8, preferably from 2 to 4, hydroxyl groups reactive toward isocyanates.
The flame-retardant flexible polyurethane foams of the present invention may contain one or more additives.
The amount of additive(s) may vary in a broad range. Typical amounts of additive(s) are between 0 and 60 % by weight, preferably between 0.5 and 50 % by weight, more preferred between 0.5 and 30 % by weight, and most preferred between 0.5 and 5 % by weight, referring to the total amount of the flame-retardant flexible polyurethane foam.
Examples of additives are antioxidants, blowing agents, further flame retardants, light stabilizers, heat stabilizers, impact modifiers, processing aids, glidants, processing aids, nucleating agents and clarifiers, antistatic agents, lubricants, such as calcium stearate and zinc stearate, viscosity and impact modifiers,
28 compatibilizers and dispersing agents, dyes or pigments, antidripping agents, additives for laser marking, hydrolysis stabilizers, chain extenders, softeners, plasticizers, fillers, reinforcing agents, surface-active additives, foam stabilizers, cell regulators, retarders, further flame-retardant substances, or else substances with fungistatic or bacteriostatic action. Examples of additives are described in Kunststoff-Handbuch [Plastics Handbook], Volume VII, Carl Hanser Verlag,
Munich, 1993, pp.104-123 as are details of the method of use and the mode of action of these additives.
The additive(s) can impart other desired properties to the flexible polyurethane foam of the invention.
The flexible polyurethane foams are prepared by methods known by the artisan. Often blowing agents are used for foam manufacture. Examples of blowing agents are water and/or highly volatile organic hydrocarbons, such as n-pentane, isopentane or cyclopentane, hydrofluoroolefins (HFO) and CO2.
Optionally concomitant use is made of auxiliaries and additives, for example catalysts of the type known per se, surface-active additives, such as emulsifiers and foam stabilizers, retarders, e.g. acidic substances, such as hydrochloric acid or organic acid halides, or else cell regulators of the type known per se, for example paraffins or fatty alcohols, and dimethylpolysiloxanes, or else pigments or dyes, and other flame retardants of the type known per se, or else stabilizers to protect from the effects of aging and weather, plasticizers, and substances with fungistatic or bacteriostatic action, or else fillers, such as barium sulfate, Kieselguhr, carbon black, or precipitated chalk (DE-A 2732292).
A further overview of the raw materials, auxiliaries, and additives used for producing polyurethane foams, and the process technology for their production, is given in Kunststoff-Handbuch [Plastics Handbook], Volume VII, Carl Hanser Verlag, Munich, 1993, pp.104-123.
29
The methods for the production of the flexible polyurethane foams of the invention are known per se. The components for the reaction may be reacted by the single- stage process known per se, the prepolymer process, or the semi-prepolymer process. Details of foam manufacture are found, for example, in Kunststoff- Handbuch [Plastics Handbook], Volume VI, Carl Hanser Verlag, Munich, 1993.
According to the invention, it is also possible to produce cold-curing foams.
However, it is also possible, to produce foams by slab foaming process known per se.
The flame retardant flexible polyurethane foams according to the invention may be produced by a continuous or batchwise method, or as foamed moldings. Preference is given to flexible foams produced by a slab foaming process.
Examples of applications of the flame retardant flexible polyurethane foam of the invention are: furniture padding, textile inserts, mattresses, automobile seats, armrests, headrests, and construction components, and also automotive seat coverings (seat liners), headliners and dashboard coverings. These uses form also part of the invention.
Examples
The following examples serve to illustrate the invention.
1) sum of indices of main component in I
2) calculated
Hydrolytic stability test
Hydrolytic stability of the flame retardants was determined by measuring the development over time of the acid number of blends of polyols with the flame retardants and water during storage at increased temperature. For this purpose, 90 g of polyol, 9 g of FR (10 wt.-%) and 4,5 g of water (5 wt.-%) were homogenized by stirring at 1500 rpm for 2 min. The acid number was determined using a 3:1 (v/v) isopropanol / water mixture as solvent and 0.1 N NaOH (aq) solution as titration agent. The samples were then stored at 40 °C and the acid numbers were determined after given periods of time. Samples were homogenized before analysis by stirring at 1500 rpm for 2 min. As a reference, the acid number development of polyol-water blends without added FR was determined (Comp. Example 1 and Comp. Example 3).
32
Table 1 : Hydrolytic stability test: Development of the acid number of mixtures of polyols with 10 wt.-% of flame retardant and 5 wt.-% of water during storage at 40°C.
1) after 7 d; 2) after 14 d
Table 1 shows that the acid number increase of water-containing polyol blends with FR3 (Example 1 and Example 2) is not significantly higher than for the water- containing polyols without flame retardant (Comp. Example 1 and Comp.
Example 3), demonstrating high hydrolytic stability of BMPO-based flame retardants like FR3 during storage in the polyols. After 28 d of storage, an acid value of 0.1 mg KOFI/g was found for the water-containing polyol Arcol® 1104 (polyether polyol, Comp. Example 1 ), and of 0.5 mg KOFI/g with added FR3 (Example 1 ). These results show only a negligible degree of hydrolysis of FR3. In comparison, the Arcol® 1104 blend containing Exolit OP 550 (Ref-2) shows a significantly increased acid value of > 40 mg KOFI/g after 11 d already, which can be explained by hydrolysis of the flame retardant (Comp. Example 2). The same experiments in Desmophen® 60WB01 (polyester polyol) show comparable observations. The acid number of pure water-containing polyol (Comp. Example 3) and the system with added FR3 (Example 2) show the same acid numbers of 1 .9 mg KOFI/g after 28 d. This proves that hydrolysis of FR3 does not considerably contribute to the increase of acid value of the polyol systems. This property of BMPO-based flame-retardants as FR3 is beneficial for typical applications of reactive flame retardants like automotive flexible polyurethane foam, because pre blends of polyols and other polyurethane foam ingredients including flame
33 retardants and water are required not to undergo hydrolysis before the foam production step (mixing with isocyanates) for as long as possible. In contrast, Ref-2 shows a marked rise of acid number at same conditions (94.7 mg KOH/g after 28 d) indicating fast hydrolysis of this material in water-containing systems. These results demonstrate that the flame retardants according to the invention, in contrast to Ref-2, are also suitable for the use in storable, ready-to-use polyol pre blends as parts of so-called polyurethane systems.
Flexible polyurethane foam formulations with performance testing
Polyol, additives, catalysts, stabilizer and blowing agent are weighed into a dry beaker and premixed for 60 s at 500 rpm (for polyether polyol formulations) and 1000 rpm (for polyester polyol formulations), respectively. After addition of TDI (tolyl diisocyanate), the mixtures are homogenized for 7 s at 2500 rpm. The resulting mass is rapidly poured into a paper-wrapped box mould (25*26*26 cm). Rise time and further observations are noted during the foaming process. The foams are cured at room temperature for approx. 16 h before cutting and further evaluation.
Table 2: Flexible polyurethane foam formulations. Amounts of all components are given in parts per 100 parts of polyol (php)
Evaluation of flame retardancy
The efficiency of the flame retardants was evaluated by testing the burning behavior of flexible polyurethane foam samples with a target density of 30 kg/m3, containing the flame retardants in the horizontal burn test, as described in the Federal Motor Vehicle Safety Standard 302 (FMVSS 302). According to this standard, samples are given the highest classification (SE, “self-extinguishing”) if the flame does not travel beyond a 38 mm mark on the specimen but extinguishes within this distance. Lower classifications include SE/NBR (self-extinguishing/no burn rate), SE/B (self-extinguishing/burn rate) and B (burn rate). Five sample specimens were cut from each foam and submitted to the test. The lowest-rated specimen determined the overall classification for the foam.
Evaluation of compression set and humid ageing performance Compression set is the relative ratio of sample thickness after recovery from compression and initial sample thickness under defined parameters. The test is carried out with untreated and humid-aged samples. It is an important quality parameter for flexible polyurethane foam, e.g. for automotive or furniture applications, ensuring stable mechanical properties during prolonged storage under compression under adverse climate conditions.
For the determination of compression set, 5 specimens with a dimension of 50*50*25 mm are prepared. The initial thickness ho is determined using sliding calipers in at least five positions without squeezing the foam. The specimens are then placed between two plates and are compressed to 50 % +1-2 % of their initial thickness, or to 75 % +1-2% of their initial thickness, for polyether and polyester polyurethane foams, respectively. The compressed specimens are stored for 72 h in a standardized climate chamber (according to DIN 50014-23/50-2) or at for 22 h at 70 °C in a heat chamber. The compression plates are then removed, and the specimens left to decompress in a standardized climate chamber (according to DIN 50014-23/50-2) for 30 min. The sample thickness after decompression IIR is measured directly thereafter.
37
Compression set is calculated as follows:
CS (%, °C, h) = [(ho - hR) / ho] * 100 Evaluation of emission performance
Low emissions from materials are particularly important in interior automotive applications. They can be classified into two types: semi-volatile condensable emissions (FOG) and volatile organic compounds (VOC). The name FOG emissions stems from the fogging effect they can have on cold surfaces such as car windshields. They can be quantified according to DIN 75201 B: A sample is heated to 100 °C for 16 h in a specialized device, while semi-volatile components of the emissions are condensed on a cooled surface and quantified gravimetrically. VOC emissions can be quantified by thermodesorption analysis according to the automotive standard VDA 278. A sample in a thermodesorption tube is heated to 90 °C for 30 min, and condensates are collected in a cooling trap before being identified and quantified via GC/MS against an external standard like toluene. The emission performance of the new flame retardant described herein was evaluated by determining both FOG and VOC emissions according to these procedures.
Shrinkage; 2)strong sagging
39
Flexible polyether polyurethane foam formulations with performance testing
As can be seen from the results in table 3, stable and defect-free polyurethane foams based on an industry-typical polyether polyol could be obtained using reference flame retardants TCPP (Comp. Example 5) and reactive flame retardant Exolit OP 550 (Comp. Example 6), as well as using the flame retardants according to the invention FR3, FR6, FR2 and FR5 (Example 3, Example 4, Example 6 and Example 8). When using trifunctional polyol TMPO-PO (Ref-3), no stable polyurethane foam formulation could be found (Comp. Example 7). Instead, strong shrinkage of the foam was observed, which can be attributed to more pronounced cross-linking due to the higher functionality of TMPO-PO compared to the flame retardants according to the invention. This finding indicates that trifunctional TMPO-PO is not a suitable flame retardant for the flexible polyether foam system used in these trials. Also, it was not possible to obtain defect-free polyurethane foams when using FR1 and FR4. Formulations containing these flame retardants (Example 5 and Example 7) led to foams that showed strong sagging and inferior flame retardancy ratings (class B), presumably as a result of limited compatibility of FR1 and FR 4 with the polyol.
Table 3 also shows that SE-ratings in the FMVSS 302 test can be achieved with significantly lower dosages of 4 php with the reactive flame retardants Ref-2, FR2 and FR3 (Comp. Example 6, Example 6 and Example 3), compared to the reference foam in Comp. Example 5, which needed 12 php of TCPP as flame retardant to achieve an SE rating. A lower flame retardant efficiency compared to FR3 was found for FR6. As shown in Example 4, a dosage 7 php was required to obtain a foam with an SE rating in the FMVSS 302 test. This inferior flame retardancy performance compared to the foams in Comp. Example 6 and Example 3 can be explained with lower solubility of FR6 in the polyol system, leading to partial demixing and an inhomogenous phosphorus distribution in the foam. This trend can also be seen for FR5, for which formulations with an FR dosage of 4 php only achieved an SE/NBR rating (Example 8).
40
Flame retardants FR2, FR3 and FR6, as well as reference reactive flame retardant Ref-2 allow the production of open-cell foams, which can be seen from good air permeability results in Example 6, Example 3, Example 4 and Comp. Example 6. Low air permeability values indicate that low pressure is required for air to pass through the foam samples, as a result of a highly open-cell foam structure. The air permeability for the foams in Example 6, Example 3 and Example 4 (containing FR2, FR3 and FR6) are in the range of the TCPP-containing reference foam Comp. Example 5, demonstrating that the cell-closing property often associated with reactive flame retardants is low for flame retardants according to the invention. This property of the flame retardants according to the invention is beneficial in the industrial production of flexible polyurethane foam, as it facilitates formulation of open-cell foams with reactive flame retardants.
Table 3 futhermore shows that very low values of compression set can be achieved when flame retardants according to the invention are used, e.g. FR2,
FR3 or FR6. Low compression set values are beneficial for typical applications like automotive headliner foam, which is usually compressed during storage and transport, and which needs to fully decompress according to OEM requirements. The compression set found for foams in Example 3, Example 4 and Example 6 (containing FR3, FR6 or FR2) are similarly low as the value found for the TCPP- containing reference foam in Comp. Example 5. Compression set is negatively influenced by ageing under humid conditions, due to hydrolytic cleavage of polymer chains. This is particularly the case for foams containing reactive flame retardants, that can act as breaking points in the polymer backbone if they are not hydrolytically stable. The good compression set values observed for the foams in Example 3, Example 4 and Example 6 can be explained with the high hydrolytic resistance of the phosphine oxide group as also demonstrated for FR3 in Example 1.
Finally, table 3 illustrates that foams containing flame retardants according to the invention are clearly advantageous in applications requiring low emissions of volatile compounds from the final material, e.g. automotive interior materials like polyurethane foam for head- and seatliners. Foams containing flame retardants
41 according to the invention FR1-F6 showed very low fogging values ranging between 0,1 and 0,3 mg. For the polyurethane foams containing FR3 (Example 3), FR6 (Example 4), FR2 (Example 6) and FR5 (Example 8), VDA-278 emission values were dramatically lower than for the TCPP-containing reference foam Comp. Example 5, and significantly lower than for the reference foam in Comp. Example 6.
In summary, these examples demonstrate that the flame retardants according to the invention provide a clear benefit over existing alternatives like reference flame retardants Ref-1 and Ref-2, as they allow polyurethane foam manufacturers to produce flame retarded foams with an open-cell structure, low compression set and very low emission values all at the same time, without using halogenated flame retardants.
Flexible polyester polyurethane foam formulations with performance testing
In additional examples, the use of the flame retardants according to the invention was demonstrated in flexible polyester polyurethane foam. The foam in Example 9, containing flame retardant FR3 was compared with reference foams using TDCPP and Exolit OP 550 as flame retardants (Comp. Example 8 and Comp. Example 9). The foams were produced according to the procedure described above for polyether-based polyurethane foams. The detailed compositions of these formulations are provided in table 2, the performance data is summarized in table 3.
As can be seen from the performance testing results (table 3), stable and defect- free foams could be made with both reference flame retardants Ref-2 and Ref-4, and with the flame retardant of the invention FR3. FR3 showed very good flame retardant efficiency in polyester-based flexible polyurethane foam (Example 9), passing the FMVSS 302 test with an SE rating at a dosage of only 6 php. The reference foams in Comp. Example 8 and Comp. Example 9, containing Ref-4 and the reactive Ref-2 as flame retardants, required significantly higher flame retardant dosages (8 and 9 php, respectively) to achieve the same rating.
42
Example 9, Comp. Example 8 and Comp. Example 9 also demonstrate the benefit of the reactive properties of the flame retardants according to the invention. As can be seen from the fogging values in table 3, the foams containing reactive flame retardants Ref-2 and FR3 lead to significantly lower condensable emissions, compared to the additive flame retardant Ref-4 in Comp. Example 8.
Example 9 also shows the advantage of the flame retardants according to the invention over other reactive flame retardants like Ref-2 in Comp. Example 9, in terms to the resistance against hydrolysis. The results for compression set after ageing are considerably better for Example 9 (containing FR3) and Comp.
Example 8 (containing Ref-4), than Comp. Example 9 (containing Ref-2). This is in line with the higher resistance to hydrolysis in water-containing polyol blends, demonstrated for FR3 in Example 2. In summary, these examples demonstrate that flame retardants according to the invention can be used for the production of flexible polyester-based flame retardant polyurethane foams which show beneficial emission characteristics and have improved resistance against hydrolysis compared to foams using other reactive flame retardants, at the same time avoiding halogenated flame retardants.
Claims
1. A flexible polyurethane foam which comprises at least one flame retardant polyurethane comprising structural units of formula (X) and/or (XI)
wherein R1 is a monovalent organic group,
R2, R3, R4 and R5 independently of one another are hydrogen, alkyl groups having between one and eight carbon atoms or aryl groups having between six and eighteen carbon atoms,
R8 is hydrogen or a group of formula (XII), n and m independently of one another are integers between 0 and 10, o, p and q independently of one another are integers between 0 and 5, with the proviso that the number of structural units of formula
44
in the the structural units of formula (XI) is between 1 and 20, characterized in that the flame-retardant polyurethane comprises at least two different structural units of formula (X).
2. The flexible polyurethane foam according to claim 1 , wherein one of R2 or R3 is hydrogen and the other one of R2 or R3 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms and wherein one of R4 or R5 is hydrogen and the other one of R4 or R5 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms.
3. The flexible polyurethane foam according to claim 2, wherein one of R2 or R3 is hydrogen and the other one of R2 or R3 is hydrogen or an alkyl group having between one and two carbon atoms, preferably methyl, and wherein one of R4 or R5 is hydrogen and the other one of R4 or R5 is hydrogen or an alkyl group having between one and two carbon atoms, preferably methyl.
4. The flexible polyurethane foam according to at least one of claims 1 to 3, wherein R2, R3, R4 and R5 independently of one another are selected from hydrogen, Ci-C6-alkyl and phenyl, more preferred from hydrogen and Ci-Ce-alkyl, and still more preferred from hydrogen and Ci-C3-alkyl, and most preferred from hydrogen and methyl.
5. The flexible polyurethane foam according to at least one of claims 1 to 4, wherein R1 is Ci-Ce-alkyl, cyclohexyl or phenyl, preferred Ci-C3-alkyl, and most preferred methyl.
45
6. The flexible polyurethane foam according to at least one of claims 1 to 5, wherein the sum n+m in each of the phosphine oxide of formula (I) is a number between 1 and 15 and most preferred between 4 and 12.
7. The flexible polyurethane foam according to at least one of claims 1 to 6, wherein the flame-retardant polyurethanes comprise at least two different structural units of formula (Xa), (Xb) and/or (Xc)
wherein
R1, m and n are as defined in claim 1 , R2a and R3a independently of one another is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon, and
R4a and R5a independently of one another is an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon.
8. The flexible polyurethane foam according to claim 1 , wherein the flame- retardant polyurethane comprises at least one structural unit of formula (XI), preferably different structural units of formula (XI), R1 is Ci-Ce-alkyl, cyclohexyl or
46 phenyl, preferred Ci-C3-alkyl, and most preferred methyl, and wherein the number of structural units of formula
is between 1 and 10.
9. The flexible polyurethane foam according to at least one of claims 1 to 6, wherein the flame-retardant polyurethane comprises at least two different phosphine oxide structural units of formulae (Xe), (Xf) and/or (Xg)
wherein
R8 is Ci-C6-alkyl, preferably methyl,
R9 and R10 independently of one another are hydrogen, C-i-Cs-alkyl or C6-C18- aryl, preferably hydrogen, Ci-C6-alkyl or phenyl, most preferred hydrogen or methyl, n and m independently of one another are integers between 0 and 10, preferably between 1 and 10, and
47 wherein the sum n+m is a number between 0 and 20, preferably between 1 and 15.
10. The flexible polyurethane foam according to at least one of claims 1 to 9, wherein the flame-retardant polyurethane comprises besides structural units of formula (X) or (XI) at least one structural unit of formula (Via)
wherein
R2, R3, R4, R5, m and n are defined as in claim 1 ,
R14 and R15 independently of one another are hydrogen, alkyl groups having between one and eight carbon atoms or aryl groups having between six and eighteen carbon atoms, and r independently of n and m is an integer between 0 and 10, preferably between 1 and 10.
11 . The flexible polyurethane foam according to claim 10, wherein one of R2 or R3 is hydrogen and the other one of R2 or R3 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms and wherein one of R4 or R5 is hydrogen and the other one of R4 or R5 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms and wherein one of R14 or R15 is hydrogen and the other one of R14 or R15 is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon atoms.
48
12. The flexible polyurethane foam according to at least one of claims 10 to 11 , wherein the flame-retardant polyurethane comprises at least two different structural units of formula (X) and at least one structural unit of formula (Via).
13. The flexible polyurethane foam as claimed in at least one of claims 1 to 12, wherein the amount of structural units of formula (X) and/or of formula (XI) and optionally of formula (Via) in the flame-retardant polyurethane used in the flexible foam is from 0.5 to 30 mol.-%, preferably from 0.5 to 20 mol.-% and most preferred from 1 to 10 mol.-%, referring to the total amount of the polyurethane.
14. The flexible polyurethane foam as claimed in at least one of claims 1 to 13, wherein the flame-retardant polyurethane is prepared by reacting organic polyisocyanates with compounds of formula (I) and/or (II) and optionally (VI) together with compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI)
R1, R2, R3, R4, R5, R6, R7, m, n, o and p are defined as in claim 1, and R14, R15 and r are defined as in claim 11.
15. The flexible polyurethane foam as claimed in claim 14, wherein the flame- retardant polyurethane is characterized by having soft portions in the molecule which are derived from a reaction between polyisocyanate and a compound having at least two hydrogen atoms reactive toward isocyanates which is different from compounds of formulae (I), (II) and (VI), said compound being selected from the group consisting of polyalkylene ether polyol, polyester polyol and hydroxyl- terminated elastomer.
16. The flexible polyurethane foam as claimed in claim 15, wherein the flame- retardant polyurethane is characterized by having besides soft portions also hard portions in the molecule which hard portions are derived from a reaction between polyisocyanate a compound having at least two hydrogen atoms reactive toward isocyanates which is different from compounds of formulae (I), (II) and (VI), said compound being a low-molecular weight polyol.
17. The flexible polyurethane foam as claimed in at least one of the claims 1 to 16, wherein the flexible polyurethane foam contains one or more additives which are present in an amount between 0 and 60 % by weight, preferably between 0.5 and 50 % by weight, more preferred between 0.5 and 30 % by weight, and most
50 preferred between 0.5 and 5 % by weight, referring to the total amount of the flexible polyurethane foam.
18. Use of the flame retardant flexible polyurethane foam as claimed in at least one of claims 1 to 17 as furniture padding, textile inserts, mattresses, automobile seats, armrests, headrests, construction components, automotive seat coverings, headliners and dashboard coverings.
19. A kit-of-parts comprising - a container A containing an organic polyisocyanate or a mixture of organic polyisocyanates, and comprising a container B containing a mixture of compounds of formula (I) and/or (II) and optionally (VI) together with compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI)
51 wherein
R1, R2, R3, R4, R5, R6, R7, m, n, o and p are defined as in claim 1, and R14, R15 and r are defined as in claim 11 , characterized in that the mixture in the container B comprises a mixture of at least two structurally different compounds of formula (I), preferred of formulae (la), (lb) and/or (lc)
wherein R2a and R3a independently of one another is hydrogen, an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon, and R4a and R5a independently of one another is an alkyl group having between one and eight carbon atoms or an aryl group having between six and eighteen carbon.
20. The kit-of-parts as claimed in claim 19, wherein the compounds having at least two hydrogen atoms reactive toward isocyanates which are different from
52 compounds of formulae (I), (II) and (VI) are selected from the group consisting of polyalkylene ether polyols, polyester polyols and hydroxyl-terminated elastomers.
21. The kit-of-parts as claimed in claim 19, wherein the compounds having at least two hydrogen atoms reactive toward isocyanates which are different from compounds of formulae (I), (II) and (VI) are low-molecular weight polyols.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22728413.0A EP4337708A1 (en) | 2021-05-11 | 2022-05-09 | Flexible foams comprising flame-retardant polyurethane, a process for their production and use thereof |
CN202280031389.9A CN117222684A (en) | 2021-05-11 | 2022-05-09 | Flexible foam comprising flame-retardant polyurethane, method for the production thereof and use thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP21173342.3 | 2021-05-11 | ||
EP21173342 | 2021-05-11 |
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WO2022238293A1 true WO2022238293A1 (en) | 2022-11-17 |
Family
ID=75914267
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PCT/EP2022/062422 WO2022238293A1 (en) | 2021-05-11 | 2022-05-09 | Flexible foams comprising flame-retardant polyurethane, a process for their production and use thereof |
Country Status (3)
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EP (1) | EP4337708A1 (en) |
CN (1) | CN117222684A (en) |
WO (1) | WO2022238293A1 (en) |
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EP4337708A1 (en) | 2024-03-20 |
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