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
  • C08G18/302—Water
• • 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
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3271—Hydroxyamines
  • C08G18/3275—Hydroxyamines 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
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
  • C08G18/341—Dicarboxylic acids, esters of polycarboxylic acids containing two carboxylic acid 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
• • 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
  • C08G2290/00—Compositions for creating anti-fogging

Definitions

• the present invention relates to a process for producing TDI-based flexible polyurethane foams, in particular foam foams, using organic acid anhydrides and / or organic acid chlorides.
• the invention further relates to the flexible polyurethane foams produced by the process according to the invention.
• polyurethanes by reacting polyisocyanates with polyols, catalysts which accelerate the reaction of the polyols with the isocyanates and optionally blowing agents, such as water, additives, and / or auxiliaries is well known.
• TDI-based flexible polyurethane foams play an essential role.
• a low isocyanate index may be advantageous because a lower hardness can be achieved thereby.
• these foams should have a high bulk density, as this leads to a better comfort feeling.
• VDA 278 test is a thermal desorption analysis of organic emissions for the characterization of non-metallic automotive materials.
• the sum value of the Fog value describes the proportion of condensable substances from a material that can be determined with the aid of VDA 278.
• the target value of the fog value is ⁇ 250 mg kg.
• these higher Fog values occur in particular in the edge zone (skin) of the foam. It is desirable to reduce the level of these undesirable substances in the skin of molded foams.
• the object of the present invention was therefore to provide TDI-based flexible polyurethane foams, preferably molded foams, which are produced at a low isocyanate index and have a high bulk density, and at the same time have the lowest possible emissions in the VDA 278 (Fog value).
• Polyurethane production or by the concomitant use of a molar fraction of> 0.15 to ⁇ 1.25 mol% of at least one carboxylic acid chloride, based on the amount of TDI used, in the production of polyurethane.
• the invention therefore provides a process for preparing TDI-based flexible polyurethane foams, preferably molded foams, with a density of> 20 kg m 3 by reacting TDI with at least one hydroxyl-containing compound in the presence of blowing agents and optionally auxiliary and / or Additives with an isocyanate index of> 70 to ⁇ 85, characterized in that the reaction
• Polycarboxylic acid based on the amount of TDI used, or
• cyclic anhydrides are understood as meaning anhydrides which form intramolecularly by dehydration from di- or polycarboxylic acids.
• polyurethane flexible foams obtainable by means of this process, which are preferably molded foams, are a further subject of the invention.
• EP 1 117 718 B1 describes a process for the preparation of foamed polyisocyanate polyaddition products using organic or inorganic acid anhydrides in order to reduce the amine content in the foams. Although is in a long list too used isocyanates also mentioned TDI.
• DE 10343099 describes the production of molded parts from polyurethane, wherein the isocyanate Carboxylic anhydrides are added to reduce the amine content.
• These are anhydrides of monocarboxylic acids (claim 1, and section [0014], 12th line and section [0016]) and polyanhydrides of mono- or polycarboxylic acids (claim 1 and as well as section [0014], 14/15 ).
• the use of cyclic anhydrides of di- or polycarboxylic acids is not described.
• the amounts of anhydride used are very high at 10% by weight, based on the isocyanate component (TDI-based examples in [0063] and [0064].)
• the invention provides a process for producing TDI-based flexible polyurethane foams, preferably molded foams, having a density of> 20 kg m 3 by reacting TDI with at least one hydroxyl-containing compound in the presence of blowing agents and optionally auxiliary and / or additives at an isocyanate index of> 70 to ⁇ 85, characterized in that the reaction
• Polycarboxylic acid based on the amount of TDI used, or
• the isocyanate index (also called the ratio) gives the percentage ratio of the actual amount of isocyanate used to the stoichiometric, i. for the conversion of OH equivalents calculated amount of isocyanate groups (NCO) amount of:
• the apparent density of the foam is preferably> 30 kg m 3 , more preferably> 40 kg m 3 .
• cyclic anhydrides for example compounds of the formula (III), (IV) or (V) are used,
• R 1 and R 2 are hydrogen, halogen, C 1 -C 22 alkyl, C 1 -C 22 alkenyl or C 6 -C 18 aryl, or R 1 and R 2 can be members of a 4 to 7 membered ring or polycyclic system, preferably R 1 and R 2 together form one benzene ring,
• R 3, R 4, R 5 and R 6 may be hydrogen, C 1 -C 22 alkyl, C 1 -C 22 alkenyl or C 6 -C 18 aryl, or may be members of a 4 to 7 membered ring or polycyclic system, and
• R 7, R 8, R 9, R 10, R 8 and R 12 are hydrogen, C 1 -C 22 -alkyl, C 1 -C 22 -alkenyl or C 6 -C 18 -aryl or may be members of a 4 to 7-membered ring or polycyclic system,
• cyclic anhydrides which are used are the following compounds: malonic anhydride, methylenemalonic anhydride, maleic anhydride,
• Citraconic anhydride, 1,2-cyclohexanedicarboxylic anhydride, diphenic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, norbornene diacetic anhydride and their chlorination products, nadic methyl anhydrides ( methyl-5-norbornene-2,3-dicarboxylicanhydrides), succinic anhydride, glutaric anhydride, Diglycolic anhydride, naphthalene-1, 8-dicarboxylic anhydride (naphthalic anhydride), naphthalene-1,2-dicarboxylic anhydride, succinic anhydride, 3 and
• cyclic anhydrides are maleic anhydride, succinic anhydride, citraconic anhydride, phthalic anhydride, naphthalic anhydride, nadic methyl anhydrides, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride and alkyl and alkenylsuccinic acids with unbranched or branched Cl to C24 alkyl or alkenyl chains, such as (1-dodecene-l-yl) or 2-dodecen-l-yl) - succinic anhydride and alkyl and / or alkenylmaleinklaren with unbranched or branched Cl to C24 alkyl or alkenyl chains, such as n-Dodecenylmaleinklainklad.
• the cyclic anhydrides can be used in admixture with the polyo
• the inventively usable carboxylic acid chlorides are not limited. In general, aliphatic carboxylic acid chlorides having 2 to 22 carbon atoms or Mixtures of Cs to C22-carboxylic acid chlorides whose radicals branched or linear, saturated or unsaturated and may be substituted, for example, optionally substituted by halogen or nitro groups. Furthermore, it is possible to use aromatic and cycloaliphatic carboxylic acid chlorides and also aralkyl- or alkylaryl-substituted carboxylic acid chlorides having 7 to 24 carbon atoms. Suitable acid chlorides may contain one to three carboxyl groups.
• Suitable aliphatic acid chlorides are, for example, pivaloyl chloride, 2-ethylhexanoic acid chloride, stearic acid chloride, butyric acid chloride, lauric acid chloride, palmitic acid chloride, acetic acid chloride, neopentanoic acid chloride, chloroacetic acid chloride, dichloroacetic acid chloride, adipic acid chloride, sebacic acid chloride, methacrylic acid chloride, etc.
• Suitable aromatic acid chlorides are, for example, benzoic acid chloride, m-nitrobenzoic acid chloride, isophthalic acid chloride, phenyls acid chloride, p-chlorobenzoic acid chloride, trans -cinnamic acid chloride, m-toluic acid chloride, etc.
• An example of a suitable cycloaliphatic acid is cyclohexanecarboxylic acid chloride.
• polyols hydroxyl-containing compounds
• polyols hydroxyl-containing compounds
• These known polyols are e.g. described in detail in Gum, Riese & Ulrich (ed.): “Reaction Polymers”, Hanser Verlag, Kunststoff 1992, pp. 66-96 and G. Oertel (ed.): “Plastics Handbook, Volume 7, Polyurethane", Hanser Verlag, Kunststoff 1993, pp. 57-75.
• suitable polyols can be found in the cited references as well as in US-A 3,652,639, US-A 4,421,872 and US-A 4,310,632.
• polyols are polyether polyols (especially poly (oxyalkylene) polyols) and polyester polyols.
• the polyether polyols are prepared by known methods, preferably by base-catalyzed polyaddition of alkylene oxides to polyfunctional starter compounds containing active hydrogen atoms, such as, for example, alcohols or amines.
• Examples include: ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,4-butanediol, hexamethylene glycol, bisphenol A, trimethylolpropane, glycerol, pentaerythritol, sorbitol, cane sugar, degraded starch, water, methylamine, ethylamine, propylamine, butylamine, aniline, Benzylamine, o- and p-toluidine, ⁇ , ⁇ -naphthylamine, ammonia, ethylenediamine, propylenediamine, 1,4-butylenediamine, 1,2-, 1,3-, 1,4-, 1,5- and / or 1 , 6-hex
• the alkylene oxides used are preferably ethylene oxide, propylene oxide, butylene oxide and mixtures thereof.
• the structure of the polyether chains by alkoxylation can be carried out only with a monomeric epoxide, but also carried out randomly or blockwise with two or three different monomeric epoxides.
• the polyaddition can, for example, also be DMC-catalyzed.
• DMC catalysts and their use for the preparation of polyether polyols are described, for example, in US Pat. Nos. 3,404,109, 3,829,505, 3,941,849, 5,158,922, 5,470,813, EP-A 700,949, EP-A 743,093 EP-A 761 708, WO-A 97/40086, WO-A 98/16310 and WO-A 00/47649.
• Polyether carbonate polyols can be obtained, for example, by catalytic reaction of ethylene oxide and propylene oxide, optionally further alkylene oxides, and carbon dioxide in the presence of H-functional starter substances (see, for example, EP-A 2046861). ,
• polyester polyols are also well known and e.g. described in the two abovementioned references ("Kunststoffhandbuch, Volume 7, Polyurethanes", “Reaction Polymers”).
• the polyester polyols are i.a. by polycondensation of polyfunctional carboxylic acids or their derivatives, e.g. Acid chlorides or anhydrides, prepared with polyfunctional hydroxyl compounds.
• polyfunctional carboxylic acids which may be used are: adipic acid, phthalic acid, isophthalic acid, terephthalic acid, oxalic acid, succinic acid, glutaric acid, azelaic acid, sebacic acid, fumaric acid or maleic acid.
• Suitable polyfunctional hydroxyl compounds are: ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, 1,12-dodecanediol, neopentyl glycol, trimethylolpropane, Triethylolpropane or glycerin.
• the preparation of the polyester polyols may also be carried out by ring-opening polymerization of lactones (e.g., caprolactone) with diols and / or triols as initiators.
• lactones e.g., caprolactone
• polyether polyols, polyether carbonate polyols and polyester polyols described above can also be used with the addition of filler-containing polyols, for example polymer polyols (styrene Acrylonitrile copolymers) or polyurea dispersion polyols etc. can be used for the production of flexible polyurethane foams.
• filler-containing polyols for example polymer polyols (styrene Acrylonitrile copolymers) or polyurea dispersion polyols etc.
• a crosslinker component may be added.
• crosslinkers e.g. Diethanolamine, triethanolamine, glycerol, trimethylolpropane (TMP), adducts of such crosslinker compounds with ethylene oxide and / or propylene oxide having an OH number ⁇ 1,000 or glycols having a number average molecular weight ⁇ 1,000 are useful.
• TMP trimethylolpropane
• Particularly preferred are triethanolamine, glycerol, TMP or low EO and / or PO adducts thereof.
• auxiliaries additives and / or flame retardants may be added.
• auxiliaries are meant in particular per se known catalysts and stabilizers.
• a flame retardant e.g. Melamine or TCPP can be used.
• aliphatic tertiary amines for example trimethylamine, tetramethylbutanediamine, 3-dimethylaminopropylamine, N, N-bis (3-dimethyaminopropyl) -N-isopropanolamine
• cycloaliphatic tertiary amines for example 1,4-diaza (2 , 2,2) bicyclooctane
• aliphatic amino ethers for example bis-dimethylaminoethyl ether, 2- (2-dimethylaminoethoxy) ethanol and N, N, N-trimethyl-N-hydroxyethyl-bisaminoethyl ether
• cycloaliphatic aminoethers for example N-ethylmorpholine
• aliphatic amidines for example trimethylamine, tetramethylbutanediamine, 3-dimethylaminopropylamine, N, N-bis (3-dimethyaminopropyl) -
• Tin (II) salts of carboxylic acids can also be used as catalysts, it being preferable for the respective underlying carboxylic acid to have from 2 to 20 carbon atoms. Particularly preferred are the tin (II) salt of 2-ethylhexanoic acid (ie stannous (2-ethylhexanoate)), the stannous salt of 2-butyloctanoic acid, the tin (II) salt of 2-ethylhexanoate. Hexyl decanoic acid, the stannous salt of neodecanoic acid, the stannous salt of oleic acid, the stannous salt of ricinoleic acid and stannous laurate.
• 2-ethylhexanoic acid ie stannous (2-ethylhexanoate
• 2-butyloctanoic acid 2-butyloctanoic acid
• Tin (IV) compounds such as dibutyltin oxide, dibutyltin dichloride, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin maleate or dioctyltin diacetate may also be used as catalysts.
• all mentioned catalysts can also be used as mixtures. Further representatives of catalysts to be used as well as details about the mode of action of the catalysts are described in Vieweg and Hochtlen (Ed.): Kunststoff-Handbuch, Volume VII, Carl Hanser Verlag, Kunststoff 1966, pp. 96-102.
• the catalysts are generally used in amounts of about 0.001 to 10 wt .-%, based on the total amount of compounds having at least two isocyanate-reactive hydrogen atoms.
• emulsifiers are e.g. the sodium salts of castor oil sulfonates or salts of fatty acids with amines such as diethylamine or diethanolamine stearic acid.
• emulsifiers are e.g. the sodium salts of castor oil sulfonates or salts of fatty acids with amines such as diethylamine or diethanolamine stearic acid.
• alkali metal or ammonium salts of sulfonic acids such as dodecylbenzenesulfonic acid or dinaphthylmethanedisulfonic acid or of fatty acids such as ricinoleic acid or of polymeric fatty acids can also be used as surface-active additives.
• the foam stabilizers used are especially polyethersiloxanes, especially water-soluble representatives.
• reaction retarders e.g. acid-reacting substances such as hydrochloric acid or organic acid halides, cell regulators known per se, such as paraffins or fatty alcohols or dimethylpolysiloxanes, and per se known pigments or dyes and flame retardants, e.g. Tris (2-chloroisopropyl) phosphate, tricresyl phosphate or ammonium phosphate and polyphosphate, also stabilizers against aging and weathering, plasticizers and fungistatic and bacteriostatic substances and fillers such as barium sulfate, diatomaceous earth, carbon black or whiting.
• reaction retarders e.g. acid-reacting substances such as hydrochloric acid or organic acid halides
• cell regulators known per se such as paraffins or fatty alcohols or dimethylpolysiloxanes
• pigments or dyes and flame retardants e.g. Tris (2-chloroisopropyl) phosphate,
• Suitable organic blowing agents are, for example, acetone, ethyl acetate, halogen-substituted alkanes, such as methylene chloride, as inorganic blowing agents, for example air or CO 2 .
• a blowing effect can also be achieved by adding compounds which decompose at temperatures above room temperature with elimination of gases, for example nitrogen, for example azo compounds, such as azodicarbonamide or azoisobutyronitrile. More preferably, water is used as the chemical blowing agent.
• blowing agents as well as details on the use of blowing agents are described in Vieweg and Hochtlen (Ed.): Kunststoff-Handbuch, Volume VII, Carl Hanser Verlag, Kunststoff 1966, p. 108f, p. 453ff and pp. 507ff ,
• water or CO2 is the sole blowing agent.
• isocyanate-based foams are known per se and e.g. in DE-A 1 694 142, DE-A 1 694 215 and DE-A 1 720 768 and in the Kunststoff-Handbuch Volume VII, Polyurethane, edited by Vieweg and Höchtlein, Carl Hanser Verlag Kunststoff 1966, as well as in the new edition of this book, edited by G. Oertel, Carl Hanser Verlag Kunststoff, Vienna 1993.
• reaction components are reacted by the conventional single-stage process, the prepolymer process or the semiprepolymer process, preferably using mechanical equipment as described in US Pat. No. 2,764,565.
• the foams according to the invention are shaped foams.
• the production of the foams is carried out in closed molds.
• the reaction mixture is introduced into a mold.
• a molding material is metal, for example, aluminum, steel or plastic, for example, epoxy resin in question.
• the mold foams the foamable reaction mixture and forms the molding.
• the foaming of the mold can be carried out in such a way that the molded part has cell structure on its surface. But it can also be carried out so that the molding has a compact skin and a cellular core. According to the invention, it is possible in this connection to proceed by introducing into the mold so much foamable reaction mixture that the foam formed just fills the mold.
• Hyperlite® Polyol 1629 product of Covestro. Reactive polyether polyol having an OH number of 31.5 mg KOH / g for the production of cold foams
• Hyperlite® Polyol 1650 product of Covestro. Reactive polyether polyol having an OH number of 20.2 mg KOH / g, which is modified with a SAN polymer (solids content: about 43 wt.%).
• Tegostab® B8736LF2 is a silicone foam stabilizer from Evonik Dabco® 33LV: product of Air Products (mixture of 33% triethylenediamine and 67% dipropylene glycol)
• Niax® A400 amine catalyst from Momentive
• Desmodur® T80 is a product of Bayer MaterialScience AG and consists of 2,4- and 2,6-diisocyanate-toluene.
• Citraconic anhydride purchased from Sigma-Aldrich
• (2-Dodecene-1-yl) succinic anhydride mixture of isomers for synthesis, purchased from Merck Millipore
• Additive acid chloride Mixture of 50% by weight of isophthalic acid dichloride dissolved in 50% by weight Desmodur 1806 (product of Covestro)
• the Fog value determination was carried out in accordance with VDA 278, whereby the storage for up to 7 days was dispensed with.
• the samples were packed in aluminum composite foil 4 hours after preparation and stored until analysis.
• a piece of the edge zone of 1 mm thickness is examined.
• the analysis consists of a 2-step process at 90 ° C (for 30 minutes, VOC value) and 120 ° C (for 60 minutes, Fog value).
• the emitted substances are transported in a helium stream and collected in a cold trap.
• the Fog value is the sum of the low volatility compounds and is calculated as the hexadecane equivalent. It is evaluated substances in the boiling range of n-alkanes from C14 to C32. Production of flexible polyurethane foam
• the starting materials listed in the examples of the following table are reacted with each other.
• the reaction mixture is introduced into a metal mold heated to 60 ° C. and previously coated with a release agent (PURA E1429H NV (Chem-Trend)).
• PURA E1429H NV Chem-Trend
• the amount used is used according to the targeted bulk density and mold volume. It was worked with 9.7 liters of mold.
• the moldings were removed from the mold after 4 minutes and pressed on. The moldings were sealed after 4 hours in aluminum composite foil.
• inventive experiments 4 and 5 show significantly lower Fog values than the comparative experiment without maleic anhydride (Comparison 1) or with very low amounts of acid anhydride (Comparison 2).
• inventive experiment 10 with citraconic anhydride shows distinctly lower Fog values in VDA 278.
• Higher amounts of acid anhydride than those claimed claimed lead to an unstable processing behavior, as shown in foam collapses (comparison 5 and 6). If the molar fraction is taken into account, it is possible to work analogously with dodecenylsuccinic anhydride (experiments 7 and 8).
• Comparative Example 9 shows that the high Fog values occur only at low ratios. With a ratio of 105, the Fog value drops significantly, but the foam is also much harder and thus is no longer comparable with the foam at index 75.

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