EP4232492A1 - Utilisation d'un gel brut dans des formulations sur la base de dispersions de polyuréthane - Google Patents

Utilisation d'un gel brut dans des formulations sur la base de dispersions de polyuréthane

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Publication number
EP4232492A1
EP4232492A1 EP21801037.9A EP21801037A EP4232492A1 EP 4232492 A1 EP4232492 A1 EP 4232492A1 EP 21801037 A EP21801037 A EP 21801037A EP 4232492 A1 EP4232492 A1 EP 4232492A1
Authority
EP
European Patent Office
Prior art keywords
weight
polyurethane
dispersion
component
adhesive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21801037.9A
Other languages
German (de)
English (en)
Inventor
Peter Kueker
Christoph Thiebes
Udo WIPPERFÜRTH
Juergen Kempkes
Dirk Dijkstra
Ruediger Musch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covestro Deutschland AG
Original Assignee
Covestro Deutschland AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Covestro Deutschland AG filed Critical Covestro Deutschland AG
Publication of EP4232492A1 publication Critical patent/EP4232492A1/fr
Pending legal-status Critical Current

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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
    • C08G18/28—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
    • 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
    • C08G18/08—Processes
    • C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
    • C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic 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
    • C08G18/08—Processes
    • C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
    • C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
    • C08G18/0823—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups containing carboxylate salt groups or groups forming them
    • 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
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • 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
    • 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
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • 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
    • C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
    • 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
    • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
    • C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
    • C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
    • C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
    • C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/06—Polyurethanes from polyesters
    • 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
    • C08G2130/00—Compositions of compatibilising agents used in mixtures of high-molecular-weight compounds having active hydrogen with other compounds having active hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2170/00—Compositions for adhesives
    • C08G2170/80—Compositions for aqueous adhesives
    • 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
    • C08G2250/00—Compositions for preparing crystalline polymers

Definitions

  • the invention relates to an aqueous dispersion containing at least (A) at least one polyurethane, (B) at least one fresh sol and (C) optionally further additives, the at least one polyurethane being anionically hydrophilic, a process for preparing the dispersion, the use of the dispersion for Production of an adhesive composition, a corresponding adhesive composition, an adhesive composite containing at least one substrate bonded with this adhesive composition, a method for producing an adhesive composite and the use of a fresh sol for achieving a thickening effect in an aqueous polyurethane dispersion.
  • Aqueous, sprayable contact adhesives for producing a wet bond are mainly produced on the basis of polychloroprene dispersions. They are used in various areas, in particular for foam bonding of mattresses and furniture. Two methods are usually used for this.
  • 2-component process (2K process) adhesive formulation and aqueous coagulant are mixed simultaneously by spraying in a spray gun that has two nozzles, see for example DE 10 2006 045384 A1.
  • 1-component method (1K method) an adhesive formulation is sprayed through a spray gun with a nozzle, see for example EP 0 624 634 A1 or EP 0 470 928 A1.
  • Adhesive formulations based on aqueous polyurethane dispersions have become established in industrial applications, for example in shoe manufacture, the bonding of parts for automotive interiors, film lamination or the bonding of textile substrates.
  • the thermal activation process is usually used.
  • the dispersion is applied to the substrate, and after the water has completely evaporated, the adhesive layer is activated by heating, for example with an infrared radiator, and converted into an adhesive state.
  • Dispersions which are suitable for the use of the thermal activation process are described, for example, in US Pat. No. 4,870,129. According to this, suitable aqueous polyurethane or polyurethane-polyurea dispersions can be obtained by using special mixtures of diisocyanates by the acetone process. The films that can be obtained therefrom have good thermoactivability.
  • the wet bonding process can also be used.
  • the bonding takes place immediately after the adhesive is applied. However, until the adhesive has set, the parts to be connected must be mechanically fixed. This process is often used to bond wood or textile substrates.
  • EP 1 664 227 B1 describes adhesives based on polyurethane dispersions. Due to the addition of silica sols with a particle diameter of at least 50 nm, these dispersions show a higher initial heat resistance during bonding, with silica sols with smaller particles not showing this effect.
  • the formulations disclosed are of low viscosity.
  • the viscosity of the formulations is generally increased by thickeners to around 2000 to 4000 mPa s. This is usually done using organic thickeners, which are toxicologically unsafe and adversely increase the content of volatile organic compounds (VOC or WOG).
  • VOC volatile organic compounds
  • WO 2003/016370 A1 describes a method for producing silica-polyurethane nanocomposites.
  • a silica sol is produced from the silica solution and mixed with polyols.
  • the water is removed and the polyol silica colloid is reacted with diisocyanate and other substances to form a silica polyurethane.
  • the aim is to improve fire protection by incorporating silica sol in the polyurethane.
  • WO 2001/090271 A1 describes a sprayable 1-component polyurethane adhesive formulation with the addition of pyrogenic silica.
  • the aim is to improve the stability of the adhesive with good spatter behavior by adding the pyrogenic silica. This is achieved by modifying the prepolymers and functionality of the polyisocyanates during production of the polyurethane dispersion.
  • EP 2 486 072 B1 discloses a sprayable polyurethane adhesive formulation with high stability and good gun sprayability with the addition of thixotropic thickeners, phthalates and pyrogenic silica.
  • the object of the present invention is therefore to provide aqueous dispersions based on polyurethane which can be used as adhesives, in particular in the thermal activation process and in wet bonding, and which exhibit outstanding adhesive properties. Furthermore, these dispersions should not have the disadvantages described in the prior art, in particular the adhesive formulations should have a viscosity suitable for the application, be storable for a long time without coagulating, be viscosity-stable and contain thickeners that are toxicologically harmless and that Do not increase the proportion of volatile organic compounds (VOC).
  • the aqueous dispersions according to the invention should have a higher heat resistance than the prior art.
  • (C) optionally further additives, the at least one polyurethane being anionically hydrophilic.
  • the aqueous dispersion according to the invention contains at least one polyurethane, which is anionically hydrophilic.
  • the present invention preferably relates to the dispersion according to the invention, the at least one polyurethane being composed of a) at least one difunctional polyester polyol, preferably with a molecular weight of 400 to 5000 g/mol, b) at least one polyisocyanate, and c) at least one chain extender, d) optionally further building blocks different from a), b) and c), with at least one of components a), b), c) and d) carries at least one anionically hydrophilizing group.
  • component c) preferably carries at least one anionically hydrophilizing group.
  • components a), b) and d) preferably do not carry any anionically hydrophilic groups.
  • Anionically hydrophilizing groups in the context of the present invention are, for example, one or more sulfonate groups, one or more carboxylate groups and/or one or more phosphate groups.
  • anionic group also includes groups which can be converted into anionic groups.
  • carboxylic acid, sulfonic acid or phosphoric acid groups are also regarded as anionically hydrophilizing groups.
  • the polyurethane present according to the invention is preferably composed of at least one difunctional polyester polyol, preferably having a molecular weight of 400 to 5000 g/mol, as component a).
  • the polyester polyols used as component a) are preferably crystalline or partially crystalline difunctional polyester polyols.
  • Methods for determining the presence or absence of crystallinity are known to those skilled in the art, for example differential scanning calorimetry (DSC) according to DIN 65467: 1999-03.
  • polyester polyols used are more preferably linear or also slightly branched polyester polyols, which are more preferably based on dicarboxylic acids and/or derivatives thereof, such as anhydrides, esters or acid chlorides and, preferably, aliphatic, linear polyols. Mixtures of dicarboxylic acids and/or their derivatives are also suitable.
  • Suitable dicarboxylic acids are selected, for example, from the group consisting of adipic acid, succinic acid, sebacic acid, dodecanedioic acid and mixtures thereof. Preference is given to succinic acid, adipic acid and sebacic acid and mixtures thereof, Succinic acid and adipic acid and mixtures thereof are particularly preferred, and adipic acid is very particularly preferred.
  • the dicarboxylic acids mentioned are used in an amount of at least 90 mol %, preferably 95 to 100 mol %, based in each case on the total amount of all carboxylic acids.
  • the preferably difunctional polyester polyols used as component a) can be prepared, for example, by polycondensation of dicarboxylic acids with polyols.
  • the polyols used for this purpose preferably have a molecular weight of 62 to 399 g/mol, consist of 2 to 12 carbon atoms, are preferably unbranched, difunctional and/or preferably have primary OH groups.
  • polyols that can be used to produce the polyester polyols used as component a) are polyhydric alcohols, such as ethanediol, di-, tri-, tetraethylene glycol, 1,2-propanediol, di-, tri-, tetrapropylene glycol, 1 3-Propanediol, 1,4-butanediol, 1,3-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2,2-dimethyl-1,3-propanediol, 1,4 -Dihydroxycyclohexane, 1,4-dimethylolcyclohexane, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol or mixtures thereof.
  • polyhydric alcohols such as ethanediol, di-,
  • Preferred polyol components for the polyester polyols a) are 1,2-ethanediol, 1,4-butanediol and 1,6-hexanediol, 1,4-butanediol and 1,6-hexanediol are particularly preferred, 1,4-butanediol is very particularly preferred .
  • the polyester polyols a) can be composed of one or more polyols. In a preferred embodiment of the present invention, they are composed of only one polyol.
  • the polyurethane produced using the same regularly has a heat of fusion of at least 35 y/g.
  • adjustment of the heat of fusion of the polyurethane can be achieved by slightly changing the content of polyester polyol a) in the composition or by slightly varying the heat of fusion of the polyester polyol.
  • polyester polyols a) The production of polyester polyols a) is known from the prior art.
  • the number-average molecular weight of the polyester polyols a) is from 400 to 5000 g/mol, preferably from 1000 to 3000 g/mol, particularly preferably from 1500 to 2500 g/mol, very particularly preferably from 1800 to 2400 g/mol.
  • the melting temperature of the crystalline or partially crystalline polyester polyols is preferably at least 35.degree. C., preferably from 40 to 80.degree. C., particularly preferably from 42 to 60.degree. C. and very particularly preferably from 45 to 52.degree.
  • the heat of fusion is at least 20 J/g, preferably at least 30 J/g and particularly preferably at least 40 J/g.
  • difunctional polyol components with a molecular weight of 62 to 399 g/mol can optionally also be present as component a').
  • Corresponding difunctional polyol components with a molecular weight of 62 to 399 g/mol are, for example, the polyols mentioned for the preparation of the polyester polyols a).
  • low molecular weight polyester diols, polyether diols, polycarbonate diols or other polymer diols are also suitable, provided they have a molecular weight of 62 to 399 g/mol.
  • any organic compounds which have at least two free isocyanate groups per molecule are suitable as component b).
  • diisocyanates which are preferably used are tetramethylene diisocyanate, methylpentamethylene diisocyanate, hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,4-diisocyanatocyclohexane, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, 4,4'-diisocyanatodicyclohexyl -methane, 4,4'-diisocyanato-dicyclohexylpropane-(2,2), 1,4-diisocyanatobenzene, 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4'-diisocyanato-diphenylmethane, 2 ,2'- and 2,4'-diisocyanatodiphenylmethane, tetramethylxyly
  • polyisocyanates known per se in polyurethane chemistry or modified polyisocyanates known per se, for example polyisocyanates containing carbodiimide groups, allophanate groups, isocyanurate groups, urethane groups and/or biuret groups.
  • polyisocyanates which contain heteroatoms in the radical linking the isocyanate groups and/or have a functionality of more than 2 isocyanate groups per molecule are also suitable.
  • the former are, for example, polyisocyanates produced by modifying simple aliphatic, cycloaliphatic, araliphatic and/or aromatic diisocyanates and made up of at least two diisocyanates with uretdione, isocyanurate, urethane, allophanate, biuret, carbodiimide, iminooxadiazinedione and/or Oxadiazinetrione structure.
  • An example of an unmodified polyisocyanate having more than 2 isocyanate groups per molecule is 4-isocyanatomethyl-1,8-octane diisocyanate (nonane triisocyanate).
  • Components b) which are particularly preferred according to the invention are hexamethylene diisocyanate (HDI) and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI) and mixtures thereof.
  • HDI hexamethylene diisocyanate
  • IPDI 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane
  • component c) used according to the invention is at least one chain extender. According to the invention, component c) preferably carries at least one anionically hydrophilizing group.
  • Preferred compounds used as component c) which carry at least one anionically hydrophilizing group are selected from the group consisting of mono- and dihydroxycarboxylic acids, mono- and diaminocarboxylic acids, mono- and dihydroxysulfonic acids, mono- and diaminosulfonic acids and mono- and dihydroxyphosphonic acids or mono- and Diaminophosphonic acids, their alkali and ammonium salts and mixtures thereof.
  • the present invention therefore preferably relates to the aqueous dispersion according to the invention, wherein in the at least one polyurethane the compound used as component c) carries at least one anionically hydrophilicizing group and is preferably selected from the group consisting of mono- and dihydroxycarboxylic acids, mono- and diaminocarboxylic acids, Mono- and dihydroxysulfonic acids, mono- and diaminosulfonic acids and mono- and dihydroxyphosphonic acids or mono- and diaminophosphonic acids, their alkali metal and ammonium salts and mixtures thereof.
  • Examples are dimethylolpropionic acid, dimethylolbutyric acid, hydroxypivalic acid, N-(2-aminoethyl)-ß-alanine, N-(2-aminoethyl)-2-aminoethanesulfonic acid, N-(2-aminoethyl)-2-aminoethanecarboxylic acid, ethylenediaminepropyl- or -butylsulfonic acid, 1 ,2- or 1,3-propylenediamine-ß-ethylsulfonic acid, malic acid, citric acid, glycolic acid, lactic acid, glycine, alanine, taurine, lysine, 3,5-diaminobenzoic acid, an addition product of IPDI and acrylic acid, see EP-A 0 916 647, Example 1, and its alkali metal and/or ammonium salts, the adduct of sodium bisulfite with butene-2-1,4-dio
  • amines can also be used for salt formation, such as ammonia, diethanolamine, triethanolamine, dimethylethanolamine, methyldiethanolamine, aminomethylpropanol and also mixtures of the amines mentioned and other amines. It makes sense for these amines to be added only after the isocyanate groups have largely reacted.
  • Particularly preferred components c) are those which have carboxy and/or carboxylate and/or sulfonate groups.
  • the sodium salts of N-(2-aminoethyl)-2-aminoethanesulfonic acid and N-(2-aminoethyl)-2-aminoethanecarboxylic acid, in particular N-(2-aminoethyl)-2-aminoethanesulfonic acid, are very particularly preferred as component c).
  • the salts of dimethylolpropionic acid are also very particularly preferred.
  • polyoxyalkylene ethers which contain at least one hydroxyl or amino group can be used as optionally further building blocks different from a), b) and c).
  • the frequently used polyalkylene oxide polyether alcohols can be obtained in a manner known per se by alkoxylating suitable starter molecules.
  • Alkylene oxides suitable for the alkoxylation reaction are, in particular, ethylene oxide and propylene oxide, which can be used individually or else together in the alkoxylation reaction.
  • Further compounds suitable as component d) are, for example, monoamines, diamines and/or polyamines and mixtures thereof.
  • monoamines are aliphatic and/or alicyclic primary and/or secondary monoamines such as ethylamine, diethylamine, the isomeric propyl and butylamines, higher linear aliphatic monoamines and cycloaliphatic monoamines such as cyclohexylamine.
  • Other examples are amino alcohols, ie compounds containing amino and hydroxyl groups in one molecule, such as.
  • diamines examples include 1,2-ethanediamine, 1,6-hexamethylenediamine, 1-amino-3,3,5-trimethyl-5-aminomethylcyclohexane (isophoronediamine), piperazine, 1,4-diaminocyclohexane and bis -(4-amino-cyclohexyl)-methane.
  • Adipic acid dihydrazide, hydrazine or hydrazine hydrate are also suitable.
  • Other examples are amino alcohols, ie compounds containing amino and hydroxyl groups in one molecule, such as. B.
  • 1,3-diamino-2-propanol N-(2-hydroxyethyl)-ethylenediamine or N,N-bis(2-hydroxyethyl)-ethylenediamine.
  • polyamines are diethylene triamine and triethylene tetramine.
  • the polyurethane according to the invention preferably contains at least one monoamine and/or at least one diamine as component d), in particular for adjusting the molar mass.
  • the polyurethane used according to the invention contains at least one OH group at the ends and/or along the polymer main chain, which is more preferably attached via an aliphatic group selected from methylene, ethylene, propylene and/or butylene groups.
  • This at least one OH group is more preferably introduced into the polyurethane according to the invention by using amino alcohols, d. H.
  • Compounds which contain amino and hydroxyl groups in a molecule are introduced as chain terminators in the synthesis of polyurethane.
  • the use of ethanolamine, N-methylethanolamine, diethanolamine or mixtures thereof is particularly preferred.
  • aqueous polyurethane dispersions according to the invention preferably contain no external emulsifiers.
  • the at least one polyurethane contains a polyester of adipic acid and 1,4-butanediol as component a), 1,4-butanediol as component a′), 1-isocyanato-3,3,5-trimethyl-5 -isocyanatomethyl-cyclohexane (IPDI) as component b), the sodium salt of N-(2-aminoethyl)-2-aminoethanesulfonic acid as component c) and diethanolamine as component d). More preferably, the polyurethane used according to the invention is made up of these components, ie it consists of these.
  • the polyurethane preferably contains 50 to 95% by weight of component a), 0 to 10% by weight of component a'), 4 to 25% by weight of component b), 0.5 to 10% by weight of component c) and 0 to 30% by weight of component d), the sum of the components present being 100% by weight.
  • the polyurethane contains 65 to 92% by weight of component a), 0 to 5% by weight of component a'), 6 to 15% by weight of component b), 0.5 to 5% by weight of component c) and 0 to 25% by weight of component d), the sum of the components present being 100% by weight.
  • the polyurethane contains 75 to 92% by weight of component a), 0 to 5% by weight of component a'), 8 to 15% by weight of component b), 0, 5 to 4% by weight of component c) and 0 to 15% by weight of component d), the sum of the components present being 100% by weight.
  • the polyurethane contains 80 to 90% by weight of component a), 0 to 3% by weight of component a'), 8 to 14% by weight of component b), 0.5 to 3% by weight of component c) and 0 to 10% by weight of component d), the sum of the components present being 100% by weight.
  • components a') and/or d) are present, they are generally present in an amount of at least 0.1% by weight.
  • the at least one polyurethane according to the invention is partially crystalline or amorphous, preferably having a glass transition temperature Tg of -65 to 10.degree.
  • the present invention therefore preferably relates to the dispersion according to the invention, the at least one polyurethane being partially crystalline or amorphous, preferably having a glass transition temperature Tg of -65 to 10° C., determined by DSC measurement in accordance with DIN 65467:1999-03.
  • the polyurethane according to the invention is referred to as partially crystalline if it has a melting peak in the DSC measurement according to DIN 65467:1999-03 at a heating rate of 20 K/min which corresponds to a melting enthalpy >5 J/g, preferably >10 J/g. more preferably > 20 J/g and most preferably > 40 J/g.
  • the melting peak is caused by the melting of regular partial structures in the polymer.
  • the melting temperature is preferably in a range from 30 to 80.degree. C., particularly preferably 40 to 70.degree. C., very particularly preferably 42 to 55.degree.
  • the first heating is evaluated in order to also detect slow-crystallizing polymers.
  • the invention is considered to be amorphous Polyurethane when it has no melting peak or a melting peak with a melting enthalpy of at most 5 J/g.
  • Component A is generally present in the dispersion according to the invention in an amount of 60 to 99.9% by weight, preferably 85 to 99.6% by weight, based in each case on the total dispersion.
  • At least one fresh sol is present as component B) in the aqueous dispersion according to the invention.
  • fresh sol means an aqueous solution of silicic acid.
  • Silica is not stable in the free state and is therefore produced in situ from various precursors, giving a dilute solution of silica Si(OH)4, so-called fresh sol, see for example US Pat. Nos. 2,244,325 and US Pat. No. 3,468,813.
  • An alkali-free SiOs solution which is produced by removing the alkali cations from the water glass, is preferably used to produce the fresh brine used.
  • a possible method of dealkalization is the treatment of the diluted water glass solutions with cation exchange resins in the H + form.
  • suitable ion exchange resins are the Lewatit® types from Lanxess AG.
  • water glass solutions with an SiOs content below 10% by weight are preferably passed through exchange columns with acidic ion exchangers.
  • Short residence times in the exchange zone in which the pH of the solutions is 5 to 7, are important in order to avoid gelling of the solutions and silicification of the exchange resin.
  • the resulting silicic acid solution ie the fresh sol desired according to the invention, can be stored preferably at low pH values and in a highly diluted solution.
  • the present invention therefore preferably relates to the dispersion according to the invention, the at least one fresh sol having a pH of 1.0 to 3.5, preferably 1.5 to 3.0, particularly preferably 1.7 to 2.9.
  • the fresh sol according to the invention has a solids concentration of preferably 4 to 8% by weight, particularly preferably 5 to 6% by weight.
  • the silicic acid Si(OH)4 is generally in equilibrium with other water-soluble oligo-silicate molecules, see for example Cengiz ⁇ zmentin, Jan Schlomach, Matthiaskind. Polymerization kinetics of silica, Chemical Engineering Technology 2004, No. 12, page 76.
  • SiOs dispersions based on silica sol, silica gel, pyrogenic silica or precipitated silica are used as component B).
  • silica sols are colloidal solutions of amorphous silicon dioxide in water, which are also referred to as silicon dioxide sols or as silicic acid sols. They are formed by renewed alkalization and by growth on existing silica sol particles, see for example DE 4033875 C2 and EP 0 572 888 A1. They are stabilized and concentrated by thermal treatment, see for example EP 0 569 813 B1, EP 1 905 741 or WO 2004/007367 A1.
  • silica gels to mean colloidally formed or unformed silicic acid of elastic to solid consistency with a loose to dense pore structure.
  • the silicic acid is in the form of highly condensed polysilicic acid.
  • the silica gels are produced from water glass by reaction with mineral acids.
  • precipitated silica water glass is treated with acid and water. This creates colloidal primary particles that grow together to form agglomerates.
  • the specific surface area is 30 to 800 m 2 /g according to DIN 66131 and the primary particle size is 5 to 100 nm.
  • the primary particles of these silicas, which are present as a solid, are firmly crosslinked to form secondary agglomerates.
  • Fumed silica can be produced from tetrachlorosilane by flame hydrolysis. It has an almost pore-free surface and has a specific surface area of 50 to 600 m 2 /g according to DIN 66131 and a primary particle size of 5 to 50 nm.
  • the pyrogenic silica produced using the arc process has a specific surface area of 25 to 300 m 2 /g according to DIN 66131 and a primary particle size of 5 to 500 nm.
  • Component (B) is generally present in the dispersion according to the invention in an amount of 0.1 to 40% by weight, preferably 0.4 to 15% by weight, based in each case on the dispersion as a whole.
  • the aqueous dispersion according to the invention can optionally contain additives, for example in an amount of from 0.1 to 30% by weight, based on the dispersion as a whole.
  • plasticizers can be added as component (C) in order to make the resulting bonded seams soft, flexible, extensible and supple for use or further processing.
  • plasticizers are di(phenoxyethyl) formal and low-volatility esters based on aromatic carboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, benzoic acid, trimellitic acid; aliphatic carboxylic acids such as maleic acid, fumaric acid, succinic acid, acetic acid, propionic acid, butyric acid, adipic acid, azelaic acid, sebacic acid, citric acid, cyclohexanedicarboxylic acid, or fatty acids such as oleic acid, ricinoleic acid or stearic acid; and phosphoric, sulfonic or alkylsulfonic acid esters.
  • aromatic carboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, benzoic acid, trimellitic acid
  • aliphatic carboxylic acids such as maleic acid, fumaric acid, succinic acid, acetic acid, propionic acid
  • epoxidized vegetable oils such as epoxidized linseed oil and epoxidized soybean oil.
  • epoxidized vegetable oils such as epoxidized linseed oil and epoxidized soybean oil.
  • di(phenoxyethyl) formal, dibutyl terephthalate and alkylsulfonic acid esters of phenol very particular preference being given to di(phenoxyethyl) formal and dibutyl terephthalate.
  • di(phenoxyethyl)formal is used as the plasticizer (component C).
  • the at least one plasticizer is generally present in the dispersion according to the invention in an amount of 0.1 to 30% by weight, preferably 15 to 25% by weight, based in each case on the total dispersion.
  • Tackifier resins can also be added as component (C) in order to increase the adhesion of the adhesive.
  • Suitable tackifier resins are both natural and synthetic resins, for example aliphatic, aromatically modified, aromatic and hydrogenated hydrocarbon resins, terpene resins, modified terpene resins and terpene-phenolic resins, or tree resin derivatives such as rosin resins, modified rosin resins such as rosin esters based on rosin (“rosin ester”), gum resin derivatives ( "gum rosin”) and tall oil derivatives ("tall oil rosin”).
  • the tackifier resins can be used individually or as mixtures.
  • Rosin resins and modified rosin resins are preferably used as tackifier resins. Rosin esters based on rosin are particularly preferably used.
  • the tackifiers can be used as 100% resins or as a dispersion in the aqueous dispersions according to the invention, provided they are compatible, in particular stable to phase separation.
  • aqueous dispersions of rosin ester dispersions are used as component C).
  • the at least one tackifier resin is generally present in the dispersion according to the invention in an amount of 0.1 to 30% by weight, preferably 15 to 25% by weight, based in each case on the total dispersion.
  • At least one flame retardant can be added to the aqueous dispersion of the invention as component (C) in order to increase the fire safety of the moldings produced therefrom.
  • suitable flame retardants are organic phosphorus and nitrogen compounds, organochlorine and organobromine compounds, and inorganic flame retardants such as antimony trioxide, aluminum hydroxide or aluminum oxide.
  • the at least one flame retardant is generally present in the dispersion according to the invention in an amount of from 0.1 to 30% by weight, preferably from 1.5 to 15% by weight, based in each case on the dispersion as a whole.
  • fungicides can also be added as component (C) for preservation. These are preferably used in amounts of 0.02 to 0.5% by weight, based on the total dispersion. Suitable fungicides are, for example, phenol and cresol derivatives or organotin compounds.
  • additives are, for example, pigments, flame retardants, antioxidants, dispersants, emulsifiers, wetting agents, adhesion promoters and/or defoamers.
  • aging agents, oxidizing agents and/or UV protection agents can be used as further additives, in particular based on oligofunctional, secondary, aromatic amines or oligofunctional, substituted phenols, such as products of the type 6-PPD (N-(1,3- dimethylbutyl)-N'-phenyl-p-phenylenediamine, for example Vulkanox® from Lanxess Deutschland GmbH, DTPD, DDA, BPH, BHT or compounds based on HALS (hindered amine light stabilizers), benzotriazoles, oxalanilides, hydroxybenzophenones and/or hydroxyphenyl S-triazine Rhenofit® DDA 50 EM, a diphenylamine derivative from Rhein Chemie, is particularly effective.
  • oxidation and/or UV protection agents are typically introduced in emulsified form as an aqueous dispersion.
  • Ageing, oxidizing and/or UV protection agents are generally present in the dispersion according to the invention in an amount of 0.1 to 2.5% by weight, preferably 0.5 to 1.5% by weight, particularly preferably 0 .75 to 1.25% by weight, based in each case on the entire dispersion.
  • component (C) is generally present in an amount of from 0.1 to 30% by weight, preferably from 15 to 25% by weight, based in each case on the dispersion as a whole.
  • aqueous dispersion according to the invention can be used, for example, in the thermal activation process. This is known per se to a person skilled in the art.
  • the aqueous dispersion according to the invention is preferably used for bonding by the spray coagulation process.
  • the aqueous adhesive formulations and a coagulant are fed separately into a 2-component spray gun and mixed in the spray jet.
  • Aqueous solutions of salts are suitable as coagulants, in particular those which have good water solubility.
  • Salts based on divalent or trivalent cations are preferably used.
  • Calcium chloride, zinc sulfate or aluminum sulfate are particularly preferably used.
  • Calcium chloride is very particularly preferably used.
  • Mixtures of different salts as described above can also be used as an aqueous solution.
  • the concentration of the aqueous salt solution suitable as a coagulant is 1 to 20% by weight, preferably 2 to 10% by weight and particularly preferably 3 to 4% by weight, based in each case on the aqueous salt solution.
  • the proportion of the aqueous solution of the coagulant is preferably 0.1 to 50% by weight, preferably 1 to 30% by weight, more preferably 8 to 20% by weight and very preferably 12 to 18% by weight, respectively based on the total of the aqueous dispersion according to the invention and the coagulant solution.
  • the present invention therefore preferably relates to the aqueous dispersion according to the invention containing
  • the aqueous dispersion according to the invention in particular for use in spray application, preferably has a viscosity of 500 to 7000 mPa s, particularly preferably 1500 to 6000 mPa s, determined in each case according to DIN ISO 2555: 2018-09 using a Brookfield rotational viscometer.
  • the aqueous dispersion according to the invention is prepared by mixing an aqueous dispersion containing at least one polyurethane with the at least one fresh sol and any further additives present.
  • the present invention therefore also relates to a process for producing the aqueous dispersion according to the invention, in which an aqueous dispersion containing at least one polyurethane is mixed with an aqueous solution of the silica, i.e. the fresh sol, and optionally further additives.
  • Process parameters suitable for this are known per se to those skilled in the art, for example the production takes place at a temperature of 20 to 28° C., more preferably in a stirred reactor.
  • the present invention also relates to the use of the dispersion according to the invention for the production of an adhesive composition.
  • Components which can be present in the adhesive composition of the invention in addition to the aqueous dispersion of the invention are known per se to those skilled in the art and/or already described above.
  • Additional additives for an adhesive composition can be selected from water-based acrylic resins, for example Acronal® from BASF, microfibrillated cellulose, for example Exilva® from Borregaard, and/or other thickener systems known to those skilled in the art.
  • the aqueous dispersion according to the invention preferably corresponds to the adhesive composition according to the invention, i.e. the adhesive composition according to the invention consists of the aqueous dispersion according to the invention.
  • the present invention also relates to an adhesive composition containing at least one aqueous dispersion according to the invention, preferably consisting of the aqueous dispersion according to the invention.
  • the present invention furthermore also relates to an adhesive composite containing at least one substrate bonded with an adhesive composition according to the invention.
  • the present invention relates to the adhesive composite according to the invention, the at least one substrate being selected from the group consisting of wood, paper, thermoplastics, elastomers, thermoplastic-elastomers, vulcanizates, textile fabrics, knitted fabrics, braids, leather, metals, ceramics , asbestos cement, stoneware, concrete, foams and combinations thereof.
  • the substrates mentioned are preferably each bonded to one another and/or to porous substrates, preferably with a density of less than 1 kg/liter.
  • the present invention also relates to a method for producing an adhesive composite, wherein at least one substrate is bonded with the adhesive composition according to the invention.
  • the adhesive composition according to the invention in particular the aqueous dispersion according to the invention, can generally be applied to the at least one substrate using all common forms of application, in particular by brushing, rolling, spraying and/or spraying, in particular by spray application, brush application or roller application.
  • the adhesive composition according to the invention is preferably applied by means of spray application.
  • the present invention relates to the method according to the invention for producing a wet-on-wet bond, in which an adhesive composition according to the invention containing the aqueous dispersion according to the invention is applied to a foam substrate, for example by means of spray application, roller application or brush application, and after a flash-off time of ⁇ 5 min, preferably ⁇ 2 min, particularly preferably ⁇ 1 min, a wet bond is produced before film formation.
  • the present invention also relates to the use of the aqueous dispersion according to the invention for bonding wood, paper, thermoplastics, elastomers, thermoplastic-elastomers, vulcanizates, textile fabrics, knitted fabrics, braids, leather, metals, ceramics, asbestos cement, stoneware, concrete, foams and combinations thereof.
  • the substrates mentioned are preferably bonded to each other and/or to porous substrates, preferably with a density of less than 1 kg/liter.
  • the present invention also relates to the use of a fresh sol for achieving a thickening effect in an aqueous polyurethane dispersion.
  • the fresh sol is added in an amount of 5 to 40% by weight, based on the resulting aqueous polyurethane dispersion, the viscosity preferably increases by 400 to >50,000 mPas, preferably 1,000 to 4,500 mPas.
  • Table 1 shows the components used in the examples according to the invention and/or comparative examples.
  • the quantitative ratios and the application weight could be determined by reweighing the storage containers and the substrates.
  • Adhesive component delivery pressure 1.3 bar
  • Coagulation component Delivery pressure 0.3 bar
  • Atomizing air pressure 2.8 bar
  • the adhesive formulation was applied to both sides of the PU foam body using a brush.
  • Type ST 5540 dimensions of the test specimen: 101 mm x 49 mm x 30 mm, material basis PUR, color white, gross weight 40 kg/m 2 , net bulk density 38 kg/m 3 according to ISO-845: 2009-10, Compression hardness at 40% 5.5 (kPa) according to DIN EN ISO 3386: 2015-10, tensile strength > 120 kpa according to DIN EN ISO 1798: 2008-04, elongation at break > 110% according to ISO-1798: 2008-04, compression set ⁇ 4 according to DIN EN ISO-1856: 2018-11 (50%/70 °C/22h)
  • test specimens mentioned under 3 were used as test material. To assess the initial strength, the test specimens were immediately after the application of the adhesive on the top (2) of the foam body (1) using spray coagulation (amount 130 to 150 g / m 2 wet) with a wooden stick (3) (square 7 x 7 mm) ) bent in the middle (4) and guided by means of the testing device (5) through 2 steel rollers (6) (diameter 40 mm each, length 64 mm each), whose tangential distance (7) was previously adjusted to 10 mm with the threaded spindle (8). has been set.
  • the tension was maintained immediately after the test specimen was pulled through the gap between the two rollers. If the foam body was pulled apart on both sides after 120 s and the material ripped out or could only be opened again with a great deal of force, the initial strength was rated “1”.
  • the viscosity of the dispersions was determined using a Brookfield viscometer in accordance with DIN ISO 2555: 2018-09.
  • the spindle was carefully dipped into the dispersion to be measured, if possible without the formation of air bubbles.
  • the bottle containing the sample to be examined was placed on a lifting platform and initially raised so far that the spindle could be attached to the drive axle without the spindle body emerging from the dispersion.
  • the hoist was raised further until the spindle dipped into the specimen up to the dipping groove on the spindle shank.
  • the engine was switched on. As soon as the LED display of the measured value had stabilized, the measured value was read.
  • a single-rod measuring electrode (Metrohm pH meter) was immersed in the dispersion or solution to be tested.
  • the rigid PVC laminating film was obtained from Benecke-Kaliko AG, Beneckeallee 40, D-30419 Hanover. Type: Renolit nature, dimensions 50 mm x 250 mm x 0.4 mm. The film was cut into the appropriate specimen width (50 mm) and specimen length (210 mm).
  • the beech wood was purchased from Rocholl GmbH, Alter Signweg 6-8, 69436 Schönbrunn-Moosbrunn. Type beech wood, planed and punched, dimensions 50 mm x 140 mm x 4.0 mm. The adhesive area is 50 mm x 110 mm.
  • the adhesive was applied to an adhesive area of 50 mm x 110 mm as a double application of adhesive with a brush only on the beech wood (1st application 30 minutes, 2nd application 60 minutes).
  • the Drying took place at room temperature and 50 to 75% humidity in a paternoster.
  • the two test specimens were placed one on top of the other in such a way that the non-structured side of the hard PVC laminating film was flush with the adhesive-coated side of the beech wood test specimen.
  • This composite was now placed in the membrane press with the beech wood side down and pressed under the following standard conditions:
  • Temperature setting of the press 103 °C (corresponding to a joint temperature of 90 °C), pressure 4 bar, pressing time 10 seconds.
  • the protruding end of the hard PVC laminating film was punched in the middle.
  • the test specimens were examined in the heat resistance test.
  • the free end of the beech test specimen was first clamped in the clamps of the measuring stations of the heating cabinet.
  • the weight 500 g was attached to the protruding end of the rigid PVC laminating film and loaded. This kept the adhesive bond at a 180° angle.
  • the heating cabinet was first heated to 50° C. and kept at 50° C. for 60 minutes.
  • the temperature in the heating cabinet was then increased in temperature steps of 10° C. each time for 60 min.
  • the final temperature was 120 °C. The time until the PVC film is completely peeled off is automatically recorded.
  • Desmodur® H 1,6-hexamethylene diisocyanate (Covestro Deutschland AG, Leverkusen/Germany)
  • Desmodur® I isophorone diisocyanate (Covestro Deutschland AG, Leverkusen/Germany)
  • polyester polyol I 450 g were dewatered at 110° C. and 15 mbar for 1 hour. At 80° C., 30.11 g Desmodur® H and then 20.14 g Desmodur® I were added. The mixture is stirred at 80 to 90° C. until a constant isocyanate content of 1.15% by weight has been reached. The reaction mixture was dissolved in 750 g of acetone and cooled to 48° C. in the process. A solution of 5.95 g of the sodium salt of N-(2-aminoethyl)-2-aminoethanesulfonic acid and 2.57 g of diethanolamine in 65 g of water was added to the homogeneous solution with vigorous stirring.
  • Table 3 Use of fresh sol in aqueous dispersions containing anionically hydrophilized polyurethanes All data in % by weight, unless stated otherwise
  • Table 4 Use of fresh sol in aqueous dispersions containing nonionic polyurethanes All data in % by weight, unless stated otherwise
  • silica sols did not show any thickening effect in polyurethane dispersions.
  • Aqueous dispersions containing fresh sol and anionically hydrophilized polyurethanes were stable in terms of pH and viscosity over a long storage period. There was neither segregation nor coagulation.
  • Table 7 Heat resistance and initial strength of aqueous formulations containing fresh sol or an organic thickener and polyurethane

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

L'invention concerne une dispersion aqueuse contenant (A) au moins un polyuréthane, (B) au moins un gel brut et (C) éventuellement d'autres additifs, ledit polyuréthane étant hydrophilisé par voie anionique. L'invention concerne également un procédé de préparation de la dispersion, l'utilisation de la dispersion pour préparer une composition adhésive, une composition adhésive correspondante, un composite adhésif contenant au moins un substrat lié à cette composition adhésive, un procédé de préparation d'un composite adhésif et l'utilisation d'un gel brut pour obtenir un effet épaississant dans une dispersion aqueuse de polyuréthane.
EP21801037.9A 2020-10-26 2021-10-22 Utilisation d'un gel brut dans des formulations sur la base de dispersions de polyuréthane Pending EP4232492A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20203814.7A EP3988595A1 (fr) 2020-10-26 2020-10-26 Utilisation de frischsol dans des formulations à base de dispersions de polyuréthane
PCT/EP2021/079304 WO2022090066A1 (fr) 2020-10-26 2021-10-22 Utilisation d'un gel brut dans des formulations sur la base de dispersions de polyuréthane

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EP4232492A1 true EP4232492A1 (fr) 2023-08-30

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EP20203814.7A Ceased EP3988595A1 (fr) 2020-10-26 2020-10-26 Utilisation de frischsol dans des formulations à base de dispersions de polyuréthane
EP21801037.9A Pending EP4232492A1 (fr) 2020-10-26 2021-10-22 Utilisation d'un gel brut dans des formulations sur la base de dispersions de polyuréthane

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EP20203814.7A Ceased EP3988595A1 (fr) 2020-10-26 2020-10-26 Utilisation de frischsol dans des formulations à base de dispersions de polyuréthane

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244325A (en) 1940-04-15 1941-06-03 Paul G Bird Colloidal solutions of inorganic oxides
US3468813A (en) 1965-09-13 1969-09-23 Nalco Chemical Co Method of producing acid silica sols
DE2446440C3 (de) 1974-09-28 1981-04-30 Bayer Ag, 5090 Leverkusen Verfahren zur Herstellung von wäßrigen Dispersionen von Sulfonatgruppen aufweisenden Polyurethanen
DE3630045A1 (de) 1986-09-04 1988-03-17 Bayer Ag Klebstoff und die verwendung des klebstoffs zur herstellung von verklebungen
DK0470928T3 (da) 1990-07-25 1997-12-22 Alfa Klebstoffe Ag Fremgangsmåde til elastisk sammenklæbning af to substratflader
DE4033875C2 (de) 1990-10-19 1999-03-04 Bad Koestritz Chemiewerk Gmbh Verfahren zur Herstellung stabiler Kieselsole
DE4216119C2 (de) 1992-05-15 1995-08-10 Bayer Ag Verfahren zur Herstellung und Konzentrierung von Kieselsolen
DE4218306C2 (de) 1992-06-03 1995-06-22 Bayer Ag Verfahren zur kontinuierlichen Herstellung großpartikulärer Kieselsole
CH685013A5 (de) 1993-05-11 1995-02-28 Alfa Klebstoffe Ag Aufsprühbare Dispersion und Verfahren zum elastischen Verkleben zweier Substratflächen.
DE19750186A1 (de) 1997-11-13 1999-05-20 Bayer Ag Hydrophilierungsmittel, ein Verfahren zu dessen Herstellung sowie dessen Verwendung als Dispergator für wäßrige Polyurethan-Dispersionen
US6797764B2 (en) 2000-02-03 2004-09-28 Olin Corporation Water-based adhesive
EP1287087B1 (fr) 2000-05-23 2006-07-05 Henkel Kommanditgesellschaft auf Aktien Adhesif polyurethanne a un composant
WO2003016370A1 (fr) 2001-08-10 2003-02-27 Chemiewerk Bad Köstritz GmbH Procede de production de nanocomposites a base d'acide silique/de polyurethane
DE10230982A1 (de) 2002-07-10 2004-01-22 H.C. Starck Gmbh Guanidincarbonat-haltiges Kieselsol
DE10343675A1 (de) 2003-09-18 2005-04-14 Bayer Materialscience Ag Wässrige Klebstoff-Dispersionen
DE102006044520A1 (de) 2006-09-21 2008-04-03 H.C. Starck Gmbh Verfahren zur Herstellung feststoffreicher Kieselsole
DE102006045384A1 (de) 2006-09-26 2008-04-03 H.C. Starck Gmbh Wässrige Siliciumdioxid Dispersionen für Klebstoffformulierungen
CA2773877C (fr) 2009-10-05 2015-06-02 Construction Research & Technology Gmbh Formulation de polyurethane a resistance crue elevee et apte a etre distribuee au moyen d'un pistolet a calfeutrer

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EP3988595A1 (fr) 2022-04-27
US20240018293A1 (en) 2024-01-18
CN116472299A (zh) 2023-07-21

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