MXPA98010037A - Process for the preparation of polyurethane foams - Google Patents
Process for the preparation of polyurethane foamsInfo
- Publication number
- MXPA98010037A MXPA98010037A MXPA/A/1998/010037A MX9810037A MXPA98010037A MX PA98010037 A MXPA98010037 A MX PA98010037A MX 9810037 A MX9810037 A MX 9810037A MX PA98010037 A MXPA98010037 A MX PA98010037A
- Authority
- MX
- Mexico
- Prior art keywords
- isocyanate
- reactive
- process according
- composition
- reactive composition
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229920005830 Polyurethane Foam Polymers 0.000 title claims abstract description 18
- 239000011496 polyurethane foam Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 38
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 30
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 14
- 239000004202 carbamide Substances 0.000 claims abstract description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920001228 Polyisocyanate Polymers 0.000 claims abstract description 11
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 11
- -1 glycol monoalkylether Chemical class 0.000 claims description 29
- IQPQWNKOIGAROB-UHFFFAOYSA-N [N-]=C=O Chemical compound [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims description 16
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims 1
- 229920005862 polyol Polymers 0.000 description 17
- 150000003077 polyols Chemical class 0.000 description 17
- 239000000047 product Substances 0.000 description 15
- 239000006260 foam Substances 0.000 description 11
- 235000013877 carbamide Nutrition 0.000 description 9
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 8
- 229920001296 polysiloxane Polymers 0.000 description 8
- 239000004094 surface-active agent Chemical class 0.000 description 8
- 239000003054 catalyst Chemical class 0.000 description 7
- 229920000768 polyamine Polymers 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 150000001346 alkyl aryl ethers Chemical class 0.000 description 4
- 150000002009 diols Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920001515 polyalkylene glycol Polymers 0.000 description 4
- LNWBFIVSTXCJJG-UHFFFAOYSA-N [diisocyanato(phenyl)methyl]benzene Chemical compound C=1C=CC=CC=1C(N=C=O)(N=C=O)C1=CC=CC=C1 LNWBFIVSTXCJJG-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- 150000004072 triols Chemical class 0.000 description 3
- WERYXYBDKMZEQL-UHFFFAOYSA-N 1,4-Butanediol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- CZMRCDWAGMRECN-UGDNZRGBSA-N D-sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 2
- IMNIMPAHZVJRPE-UHFFFAOYSA-N DABCO Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N Diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 229920000265 Polyparaphenylene Polymers 0.000 description 2
- 229920001451 Polypropylene glycol Polymers 0.000 description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N Stearyl alcohol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
- CZMRCDWAGMRECN-GDQSFJPYSA-N Sucrose Natural products O([C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@H](CO)O1)[C@@]1(CO)[C@H](O)[C@@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-GDQSFJPYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N ethanolamine Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 125000002349 hydroxyamino group Chemical group [H]ON([H])[*] 0.000 description 2
- PGYPOBZJRVSMDS-UHFFFAOYSA-N loperamide hydrochloride Chemical compound Cl.C=1C=CC=CC=1C(C=1C=CC=CC=1)(C(=O)N(C)C)CCN(CC1)CCC1(O)C1=CC=C(Cl)C=C1 PGYPOBZJRVSMDS-UHFFFAOYSA-N 0.000 description 2
- 229920002866 paraformaldehyde Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
- 235000013772 propylene glycol Nutrition 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 2
- 239000005720 sucrose Substances 0.000 description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N 1,2-ethanediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-Amino-2-propanol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 description 1
- HNRMPXKDFBEGFZ-UHFFFAOYSA-N 2,2-Dimethylbutane Chemical compound CCC(C)(C)C HNRMPXKDFBEGFZ-UHFFFAOYSA-N 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- LCZVSXRMYJUNFX-UHFFFAOYSA-N 2-[2-(2-hydroxypropoxy)propoxy]propan-1-ol Chemical compound CC(O)COC(C)COC(C)CO LCZVSXRMYJUNFX-UHFFFAOYSA-N 0.000 description 1
- QTHRIIFWIHUMFH-UHFFFAOYSA-L 3-chloropropyl phosphate Chemical compound [O-]P([O-])(=O)OCCCCl QTHRIIFWIHUMFH-UHFFFAOYSA-L 0.000 description 1
- YBRVSVVVWCFQMG-UHFFFAOYSA-N 4,4'-Methylenedianiline Chemical compound C1=CC(N)=CC=C1CC1=CC=C(N)C=C1 YBRVSVVVWCFQMG-UHFFFAOYSA-N 0.000 description 1
- RQEOBXYYEPMCPJ-UHFFFAOYSA-N 4,6-diethyl-2-methylbenzene-1,3-diamine Chemical compound CCC1=CC(CC)=C(N)C(C)=C1N RQEOBXYYEPMCPJ-UHFFFAOYSA-N 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- 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
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- XXBDWLFCJWSEKW-UHFFFAOYSA-N Dimethylbenzylamine Chemical compound CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 description 1
- SZXQTJUDPRGNJN-UHFFFAOYSA-N Dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229940102253 ISOPROPANOLAMINE Drugs 0.000 description 1
- 229920001730 Moisture cure polyurethane Polymers 0.000 description 1
- 239000004698 Polyethylene (PE) Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- KSBAEPSJVUENNK-UHFFFAOYSA-L Tin(II) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Tris Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- MAJYSQJXMUDACI-UHFFFAOYSA-N [N-]=C=O.[N-]=C=O.C=1C=CC=CC=1CC1=CC=CC=C1 Chemical class [N-]=C=O.[N-]=C=O.C=1C=CC=CC=1CC1=CC=CC=C1 MAJYSQJXMUDACI-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 150000001414 amino alcohols Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 description 1
- 230000001413 cellular Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 150000005676 cyclic carbonates Chemical class 0.000 description 1
- 150000002081 enamines Chemical class 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000004872 foam stabilizing agent Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 125000004435 hydrogen atoms Chemical group [H]* 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N oxane Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005903 polyol mixture Polymers 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- VOZKAJLKRJDJLL-UHFFFAOYSA-N tolylenediamine group Chemical group CC1=C(C=C(C=C1)N)N VOZKAJLKRJDJLL-UHFFFAOYSA-N 0.000 description 1
- AVWRKZWQTYIKIY-UHFFFAOYSA-M urea-1-carboxylate Chemical compound NC(=O)NC([O-])=O AVWRKZWQTYIKIY-UHFFFAOYSA-M 0.000 description 1
Abstract
A process for the preparation of polyurethane foams by reacting a polyisocyanate composition with an isocyanate-reactive composition under foam-forming conditions, wherein the isocyanate-reactive composition comprises a monofunctional alcohol and an isocyanate-reactive cyclic urea.
Description
PROCESS FOR THE PREPARATION OF POLYURETHANE FOAMS
DESCRIPTION
The present invention relates to a process for the preparation of polyurethane foams, in particular semi-rigid open-cell polyurethane foams, the foams obtained in this way and isocyanate-reactive compositions useful for their preparation. EP-A 599496 describes polyol compositions "consisting of a polyol, a non-soluble fluorinated compound and a surfactant which is the product of the reaction between the stoichiometric excess of a polyisocyanate and a polyalkylene glycol monoalkylether. for preparing open cell rigid foams by reacting them with a polyisocyanate composition in the presence of a cyclic carbonate or a cyclic urea reactive to the isocyanate, an inert insoluble fluorinated compound and a catalyst EP-A 498629 describes the use of ureas isocyanate-reactive as an expansion promoter in the preparation of cellular polymeric products It has now been found that polyurethane foams, especially semi-rigid open-cell polyurethane foams, having improved physical properties, can be obtained from formulations containing a cyclic urea reactive to i socianate and a monofunctional alcohol in the isocyanate-reactive component. In this way, the present invention relates to a process for the preparation of polyurethane foams, in
particular semi-rigid open cell polyurethane foams, by reacting a polyisocyanate composition with an isocyanate-reactive composition under conditions suitable for the formation of foams, in which
^^ the isocyanate-reactive composition consists of an alcohol
monofunctional and a cyclic urea reactive to the isocyanate of the following formula:
wherein each R1, in independently a lower alkyl radical of C-C6 or a lower alkyl radical substituted with a group reactive to the isocyanate, and each R, is independently H, a lower alkyl radical of o - (CH2) mX where X is an isocyanate reactive group which is OH or NH2, and m is 0.1 or 2; and wherein n is 1 or 2 with the proviso that at least one of R1 or R is or consists of a group reactive to the isocyanate.
Cyclic ureas of the formula are preferred:
The organic polyisocyanates which can be used in the preparation of the polyurethane foams of the present invention include: aliphatic, cycloaliphatic, araliphatic and aromatic polyisocyanates, especially aromatic polusocyanates such as toluene and pure, modified or crude diphenylmethane diisocyanates. In particular, MDI variants containing residues of urethane, allophanate, urea, biuret, carbodumide or uretonimine, and mixtures of diphenylmethane diisocyanate (s) and oligomers thereof, commonly known as "crude" or "polymeric" MDI, are useful.
(polymethylene polyphenylene polyisocyanates). The MDI is preferred
"raw" .
The isocyanate-reactive compounds useful in the process of the present invention include any of those known in the art for the preparation of flexible, semi-rigid or rigid foams. In general, mixtures of polyols or polyols used in the manufacture of flexible or semi-rigid foams have an average hydroxyl value of less than 350, preferably of between 20 and 200, and a functionality of between 2 and 6, preferably between 2 and 4. Particular mention may be made of polyoxypropylene diols and triols and poly (oxypropylene-oxyethylene) diols and triols, especially polyoxypropylene diols and triols coated with ethylene oxide. If desired, polymer polyols formed by the polymerization of one or more olefinic monomers in a polyester polyol or polyether can be used. Other polyols that can also be used are polyesters, polythioethers with hydroxyl termination, polyamides, polyesteramides, polycarbonates, polyacetals, polyolefins and polysiloxanes. The polyols or polyol mixtures which are particularly useful in the preparation of rigid polyurethane foams are those having average hydroxyl values of between 300 and 10001 especially between 300 and 700 mg of KOHIg, and hydroxyl functionalities of between 2 and 8, in special, between 3 and 8. Suitable polyols include those reaction products of alkylene oxides, for example, propylene oxide and / or ethylene, with initiators containing between 2 and 8 active hydrogen atoms per molecule. Suitable initiators include: polyols, for example, glycerol, trimethylpropane, triethanolamine, pentaerythritol, sorbitol and sucrose; polyamines, for example, ethylenediamine, tolylenediamine, diaminodiphenylmethane polyamines and polyphenylene polymethylene polyamines; and aminoalcohols, for example, ethanolamine and diethanolamine; and mixtures of said initiators. Other suitable polymeric polyols include polyesters obtained by the condensation of suitable proportions of glycols and polyols of high functionality with dicarboxylic or polycarboxylic acids. Also, other suitable polymeric polyols include the polyethylenes with hydroxyl termination, polyamides, polyesteramides, polycarbonates, polyacetals, polyolefins and polysiloxanes. Any of the aforementioned polyols or mixtures thereof can be used in the process of the present invention, depending on the type of foam desired. Isocyanate-reactive compounds of low molecular weight can also be found in the isocyanate-reactive composition. Low molecular weight isocyanate-reactive compounds include polyols, polyamines, hydroxyamino compounds, their imino-functional or enamine-containing derivatives and mixtures thereof having a molecular weight of less than 1000 and a functionality of between 2 and 8. Suitable low molecular weight polyols include diols such as ethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol and 1,4-butanediol. Suitable polyamines possessing a low molecular weight are, for example, araliphatic, aliphatic or cycloaliphatic polyamines containing two or more primary and / or secondary amino groups, such as polyethers terminated in amines and aromatic polyamines such as DETDA. Suitable low molecular weight hydroxyamino compounds comprise monoethanolamine, diethanolamine, isopropanolamine and the like. Monofunctional alcohols suitable for use in the present invention are the polyalkylene glycol monoalkyl ethers of the formula RA-OH, wherein R is alkyl CX.2S is already a polypropyleneoxy chain, optionally containing up to 25% polyethyleneoxy units, with a total length of between 4 and 39 units. Preferred polyalkylene glycol monoalkyl ethers are those in which the sum of the length of the alkyl chain of R and the length of the polypropyleneoxy chain of A results in between 5 and 40, preferably between 10 and 30, and more preferably still , between 20 and 30. Preferably A represents an apolipropyleneoxy chain containing non-polyethyleneoxy units. Preferred polyalkylene glycol monoalkyl ethers are those of the formula R-A-OH where R is C8.22 alkyl (which may be straight or branched) and A represents a polypropyleneoxy chain containing between 5 and 20 propyleneoxy units. Special mention must be made of the pox.propiXen ^ cot oalguilétereS aeraos by pro rci stearyl alcohol, for example, which contains an average of 10 units of propyleneoxy, which is a commercial product of Chemical Industries PLC under the trademark Arlamol E. In addition to the isocyanate-reactive compositions and the polyisocyanate, and the blowing agent, the foam-forming reaction mixture may also contain one or more conventional auxiliaries or additives of the formulations for the production of semi-polyurethane foams. rigid, rigid or flexible. These optional additives include foam stabilizing agents or surfactants, for example, siloxane-oxyalkylene copolymers, urethane catalysts, for example, metal compounds or tertiary amines such as stannous octoate or triethylene diamine and pyro-retardants, for example halogenated alkyl phosphates such as tris chloropropylphosphate. The amount of polyisocyanate used in relation to the isocyanate-reactive compounds is generally sufficient to provide an isocyanate index of between
and 300, preferably between 40 and 250, and more preferably
between 50 and 150. By operating the process for the manufacture of foams according to the present invention, the techniques known as: single injection can be used,
• prepolymer or semipre-polymeric together with conventional mixed 0 methods. The process of the present invention can be used to prepare any type of polyurethane foam. It is particularly useful for the preparation of semi-rigid polyurethane foams, and especially for foams
semi-rigid open cell polyurethanics. The polyurethane foams of the present invention show better acoustic insulation and absorption and can be used as materials for acoustic damping or absorption in applications of the automotive industry and construction. They are very useful in the production of acoustic partitions for construction, for example, laminated gypsum panels. In another aspect, the invention also relates to isocyanate-reactive compositions consisting of a monofunctional alcohol and a cyclic urea reactive to the isocyanate of the formula (1). • The monofunctional alcohol may be present in the isocyanate-reactive composition in amounts between 5 and 95% by weight based on the isocyanate-reactive composition. Preferably, 15 to 80% monofunctional alcohol by weight is added based on the isocyanate-reactive composition to the isocyanate-reactive composition. The cyclic urea reactive to the isocyanate may be present in the isocyanate-reactive composition in amounts ranging from 0.05 to 40% by weight based on the isocyanate-reactive composition. Preferably, the isocyanate-reactive composition is added between 1 and 25% by weight based on the cyclic isocyanate-reactive isocyanate-reactive isocyanate composition.
The invention is illustrated by the following examples, but is not limited thereto. • Examples The polyurethane foams were prepared from a
conventionally by reacting the components in the amounts (considered as parts by weight) as shown in the Table. Also, the properties of the foams that were measured in the following table are indicated.
laü a
a = damping coefficient perpendicular to sound incidence: measured according to ASTM E-l
• 050-86. The dynamic rigidity was measured in accordance with ISO 9052-1: 1989 and the specific resistance to air flow in accordance with ISO 9053: 1991. Polyol A: polyetherpolyol initiated with sucrose / DEG of hydroxyl value 155 Polyol B: oxypropylene / oxyethylene diol formed by 12% of ^^ oxyethylene groups as terminal groups and with 64% of primary hydroxyl groups (hydroxyl value = 55). Monofunctional alcohol: propoxylated stearyl alcohol with an average content of 10 units of propyleneoxy
(Arlamol E: commercial product of Imperial Chemical Industries
PLC) 15 B8919: silicone surfactant commercial product of
Th. Goldschmidt ^^ B8433: silicone surfactant commercial product of
Th. Goldschmidt B8406: silicone surfactant commercial product of 20 Th. Goldschmidt LK221: silicone surfactant commercial product of Air Products UAX6080: silicone surfactant commercial product of OSI Y107662: silicone surfactant commercial product of OSI Catalyst X: Catalyst potassium product of Imperial Chemical Industries PLC Catalyst Y: N, N Dimethylbenzylamine Catalyst Z: Niax Al (Amine Catalyst commercial product of Union Carbide) Cyclic Urea: Fixapret NF (commercial product of BASF AG) MEG: monoethylene glycol "Polyisocyanate: Suprasec DNR (NCO) value 30.7; functionality 2.7), commercial product of Imperial Chemical Industries PLC (Suprasec is a registered trademark of Imperial Chemical Industries PLC.) The foams according to the present invention possess a dynamic stiffness and a specific resistance to air flow significantly lower and a higher absorption coefficient than that of the foams manufactured with formulations that do not contain a monofunctional alcohol.
Claims (12)
1. A process for the preparation of polyurethane foams by reacting a polyisocyanate composition with an isocyanate-reactive composition under conditions suitable for foaming, characterized in that the isocyanate-reactive composition consists of a monofunctional alcohol and a cyclic urea reactive to the isocyanate of the formula: OR Wherein each R1 is independently a lower alkyl radical of or lower alkyl radical substituted with ^^ a group reactive to the isocyanate, and each R, is independently H, a lower alkyl radical of CJ-CQ, O (CH2) m-X wherein, X is an isocyanate-reactive group which is OH or NH2, and m is 0.1 or 2; and wherein n is 1 or 2 with the proviso that at least one of R1 or R is or consists of a group reactive to the isocyanate.
2. A process according to claim 1 characterized in that the cyclic urea reactive to the isocyanate is
3. A process according to claim 2 characterized in that the amount of cyclic urea reactive to the isocyanate varies between 1 and 25% by weight of the isocyanate-reactive composition.
4. A process according to any of the preceding claims characterized in that the monofunctional alcohol is a polyalgylene glycol monoalkylether of the formula RA-OH, wherein R is C1.25 alkyl and A is a polypropyleneoxy chain, optionally containing up to 25 % of polyethyleneoxy units, with a total length between 4 and 39 units. A process according to claim 4, characterized in that the sum of the length of the alkyl chain of R and the length of the polypropylene chain of A varies between 5 and 40. 6. A process according to claim 4 or 5 characterized in that R is a C8_22 alkyl. 7. A process according to claims 4, 5 or 6 characterized in that A is a polypropylene chain that 5 has between 5 and 20 propyleneoxy units. 8. A process according to any of claims 4 to 7 characterized in that the amount of monofunctional alcohol varies between 1 5 and 80% by weight of the ^ _ isocyanate-reactive composition. 9. Semi-rigid open cell polyurethane foams characterized in that they are obtained by a process according to any of the preceding claims. 10. An isocyanate-reactive composition characterized in that it consists of a monofunctional alcohol and a 15 cyclic urea reactive to the isocyanate of the formula (1). 11. An isocyanate-reactive composition according to claim 10, characterized in that the amount of cyclic urea reactive to the isocyanate varies between 1 and 25% by weight of the isocyanate-reactive composition. 12. An isocyanate-reactive composition according to claim 10, characterized in that the amount of monofunctional alcohol varies between 15 and 80% by weight of the isocyanate-reactive composition.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96112252.0 | 1996-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MXPA98010037A true MXPA98010037A (en) | 1999-04-27 |
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