EP1504052A1 - Dispersion aqueuse de nanoparticules anorganiques, procede de fabrication et utilisation - Google Patents

Dispersion aqueuse de nanoparticules anorganiques, procede de fabrication et utilisation

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Publication number
EP1504052A1
EP1504052A1 EP03725139A EP03725139A EP1504052A1 EP 1504052 A1 EP1504052 A1 EP 1504052A1 EP 03725139 A EP03725139 A EP 03725139A EP 03725139 A EP03725139 A EP 03725139A EP 1504052 A1 EP1504052 A1 EP 1504052A1
Authority
EP
European Patent Office
Prior art keywords
aqueous dispersion
dispersion according
group
monomer
anionic
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.)
Withdrawn
Application number
EP03725139A
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German (de)
English (en)
Inventor
Wolfgang Bremser
Winfried Stübbe
Elke Westhoff
Manuela Niemeier
Andreas Poppe
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.)
BASF Coatings GmbH
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BASF Coatings GmbH
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Filing date
Publication date
Application filed by BASF Coatings GmbH filed Critical BASF Coatings GmbH
Publication of EP1504052A1 publication Critical patent/EP1504052A1/fr
Withdrawn legal-status Critical Current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
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
    • C08J3/21—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase
    • C08J3/212—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase and solid additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
    • C08F293/005—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent

Definitions

  • Aqueous dispersion of inorganic nanoparticles process for their preparation and their use
  • the present invention relates to a new aqueous dispersion of inorganic nanoparticles.
  • the present invention also relates to a new method for producing aqueous dispersions of inorganic nanoparticles.
  • the present invention relates to the use of the new aqueous dispersion of inorganic nanoparticles for the production of coatings and lacquers as well as moldings, in particular optical moldings, and self-supporting films.
  • L at least divalent organic linking group
  • M bivalent to hexavalent main group and sub group metal; R monovalent organic residue;
  • o an integer from 1 to 5;
  • + p is an integer from 2 to 6;
  • p is an integer from 1 to 6
  • n and n are zero or an integer from 1 to 5;
  • the known aqueous dispersions of surface-modified inorganic nanoparticles can be used as coating materials for the production of transparent, scratch-resistant coatings.
  • the known coatings have high transparency and good adhesion to a large number of substrates. However, they are comparatively brittle and cannot be produced in layer thicknesses> 30 ⁇ m because stress cracks then occur. In addition, the known coatings contain comparatively easily after exposure to water.
  • indices and the variables have the following meaning: S reactive functional group with at least one bond that can be activated with actinic radiation;
  • L at least divalent organic linking group
  • o an integer from 1 to 5;
  • n for m 3, 1 or 2 and
  • n for m 4, 1, 2 or 3;
  • the coating materials can contain (meth) acrylate copolymers as binders.
  • the (meth) acrylate copolymers can also contain monomers (b) of the general formula I:
  • R 1 R 2 C CR 3 R 4 (I), wherein the radicals R 1 , R 2 , R 3 and R each independently represent hydrogen atoms or substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl or arylcycloalkyl radicals with which Provided that at least two of the variables R 1 , R 2 , R 3 and R 4 represent substituted or unsubstituted aryl, arylalkyl or arylcycloalkyl radicals, in particular substituted or unsubstituted aryl radicals; polymerized included.
  • the coating materials can be conventional, organic solvent-containing systems, aqueous systems, essentially or completely solvent-free and water-free liquid coating materials (100% systems), essentially or completely solvent-free and water-free solid coating materials (powder coatings) or essentially or completely solvent-free powder coating suspensions (Powder slurries). In the examples, however, only a conventional clear lacquer containing organic solvents is described. In addition, the electrophoretic mobility of the binders in an aqueous dispersion with a pH of 2 to 7 is not specified.
  • radicals R 1 , R 2 , R 3 and R 4 each independently of one another represent hydrogen atoms or substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl,
  • the surface of the hydophilic nanoparticles is not modified.
  • the object of the present invention is to provide new aqueous dispersions of surface-modified, inorganic nanoparticles which no longer have the disadvantages of the prior art, but are stable in storage and which provide coatings and coatings, as well as optical moldings and self-supporting films are highly scratch-resistant, high-gloss, flexible, transparent and clear, with the coatings and varnishes in layer thicknesses> 30 ⁇ m no longer showing any stress cracks and no delamination from the substrates.
  • the new aqueous dispersion was pH 2 to 7 containing
  • the dispersion according to the invention has a pH of 2 to 7, preferably 2.5 to 7 and in particular 3 to 6.5. It is adjusted by adding inorganic and / or organic acids which do not undergo any undesirable reactions with the starting products and the constituents of the dispersion according to the invention, such as precipitation reactions or the decomposition of nanoparticles (B).
  • suitable acids are formic acid, acetic acid and hydrochloric acid.
  • the solids content of the dispersion according to the invention can vary very widely and depends on the requirements of the individual case. It is preferably 10 to 80, preferably 15 to 75, particularly preferably 20 to 70, very particularly preferably 25 to 65 and in particular 30 to 60% by weight, in each case based on the total amount of the dispersion according to the invention.
  • the first essential constituent of the dispersion according to the invention is at least one, in particular a, swellable polymer or oligomer (A), in particular a polymer (A), with anionic and / or potentially anionic functional groups.
  • polymers are understood to mean compounds which, on statistical average, contain more than 10 monomer units in the molecule.
  • Oligomers are understood to mean compounds which contain a statistical average of 2 to 15 monomer units in the molecule.
  • the anionic and potentially anionic functional groups are preferably selected from the group consisting of carboxylic acid, sulfonic acid and phosphonic acid groups, acidic sulfuric acid and phosphoric acid ester groups and carboxylate, sulfonate, phosphonate, sulfate ester and phosphate ester groups, in particular carboxylic acid and carboxylate groups ,
  • the content of anionic and / or potentially anionic functional groups in the polymers and oligomers (A) can vary very widely and depends on the requirements of the individual case, in particular on how many of these groups are required in order to determine the swellability of the polymers and oligomers (A ) in aqueous media with a pH value of 2 to 7.
  • the content preferably corresponds to an acid number of 5 to 70, preferably 6 to 60, particularly preferably 7 to 50, very particularly preferably 8 to 40 and in particular 9 to 30 mg KOH / g.
  • solid is understood to mean the sum of the constituents which form the coatings, optical moldings and self-supporting films produced from the dispersion according to the invention.
  • the swellable polymers and oligomers (A) preferably have an electrophoretic mobility ⁇ -0.5, preferably ⁇ -2.0 ( ⁇ m / s) / (V / cm) at pH values from 2 to 7. Electrophoretic mobility can be determined using laser Doppler electrophoresis.
  • the Zetasizer ® 3000 from Malvern can be used as the measuring device. However, microelectrophoretic (microscopic) measurement methods can also be used.
  • polymers and oligomers (A) from the group of the copolymers which are obtainable by the two-stage or multistage, controlled radical copolymerization in an aqueous or an organic, in particular in an aqueous, medium are preferred,
  • radicals R 1 , R 2 , R 3 and R 4 are each independently of one another for hydrogen atoms or substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl or arylcycloalkyl radicals, with the proviso that at least two of the variables R 1 , R 2 , R 3 and R 4 are substituted or unsubstituted aryl, arylalkyl or arylcycloalkyl radicals, in particular substituted or unsubstituted aryl radicals;
  • Examples of highly suitable monomers (a) containing the anionic and / or potentially anionic functional groups described above are acrylic acid, beta-carboxyethyl acrylate, methacrylic acid, ethacrylic acid, crotonic acid, maleic acid, fumaric acid or itaconic acid; olefinically unsaturated sulfonic or phosphonic acids or their partial esters; or maleic acid mono (meth) acryloyloxyethyl ester,
  • Phthalic acid mono (meth) acryloyloxyethyl ester especially acrylic acid and methacrylic acid.
  • hydrophilic monomers (a) containing nonionic hydrophilic groups can also be used.
  • Preferred hydrophilic groups are polyethylene oxide groups, preferably oligomeric polyethylene oxide groups up to a molecular weight of 400 daltons. The content of such groups in the copolymers (A) can vary very widely and is preferably based on the molar amount of the anionic and / or potentially anionic groups present.
  • hydrophilic monomers (a) with functional groups of this type are omega-hydroxy or omega-methoxy-polyethylene oxide-1-yl, omega-methoxy-polypropylene oxide-1-yl, or omega-methoxy-poly (ethylene oxide) co-polypropylene oxide) -1-yl-acrylate or - methacrylate.
  • monomers (a) which do not contain any potentially anionic and / or anionic and no nonionic hydrophilic groups can also be used. These monomers (a) can be hydrophobic.
  • esters of olefinically unsaturated acids such as (meth) acrylic acid, crotonic acid, ethacrylic acid, Vinylphosphonic acid or vinylsulfonic acid alkyl or cycloalkyl esters with up to 20 carbon atoms in the alkyl radical, in particular methyl, ethyl, propyl, n-butyl, sec-butyl, tert-butyl, hexyl, ethylhexyl, stearyl and Lauryl acrylate, methacrylate, crotonate, ethacrylate or vinyl phosphonate or vinyl sulfonate; cycloaliphatic (meth) acrylic acid, crotonic acid, ethacrylic acid, vinylphosphonic acid or vinylsulfonic acid esters, in particular cyclohexyl, isobornyl, dicyclopentadienyl, octahydro-4,7-methano
  • higher-functional (meth) acrylic acid, crotonic acid or alkyl or cycloalkyl ethacrylate such as ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, butylene glycol, pentane-1, 5-diol, hexane-1, 6 -diol-, octahydro-4,7-methano-1 H-indene-dimethanol or cyclohexane-1, 2-, -1, 3- or - 1, 4-diol-di (meth) acrylate; Trimethylolpropane tri (meth) acrylate; or pentaerythritol tetra (meth) acrylate and the analog ethacrylates or crotonates.
  • higher-functional (meth) acrylic acid, crotonic acid or alkyl or cycloalkyl ethacrylate such as ethylene glycol, propylene glycol, diethylene glycol, di
  • Monomers (1) are to be understood as amounts which do not lead to the crosslinking or gelling of the copolymers (A), unless they should be in the form of crosslinked microgel particles;
  • Carboxylic acids such as hydroxyalkyl esters of acrylic acid, Methacrylic acid and ethacrylic acid in which the hydroxyalkyl group contains up to 20 carbon atoms, such as 2-hydroxyethyl, 2-hydroxypropyl, 3-hydroxypropyl, 3-hydroxybutyl, 4-hydroxybutyl acrylate, methacrylate or - ethacrylate; 1,4-bis (hydroxymethyl) cyclohexane, octahydro
  • Methyl propanediol monoacrylate monomethacrylate, monoethacrylate or monocrotonate
  • olefinically unsaturated alcohols such as allyl alcohol
  • Allyl ethers of polyols such as trimethylolpropane monoallyl ether or pentaerythritol mono-, di- or triallyl ether.
  • the higher functional monomers (1) are generally used only in minor amounts.
  • minor amounts of higher-functional monomers are understood to mean those amounts which do not lead to crosslinking or gelling of the copolymers (A), unless they should be in the form of crosslinked microgel particles;
  • the reaction of acrylic or methacrylic acid with the glycidyl ester of a carboxylic acid with a tertiary alpha carbon atom can be carried out before, during or after the polymerization reaction.
  • component (a1) Reaction product of acrylic and / or methacrylic acid with the glycidyl ester of Versatic ⁇ acid used.
  • This glycidyl ester is commercially available under the name Cardura® E10.
  • varnish and printing inks are used on Römpp Lexikon, Georg Thieme Verlag, Stuttgart, New York,
  • Olefinically unsaturated monomers containing acryloxysilane groups and hydroxyl groups can be prepared by
  • vinyl esters of monocarboxylic acids with 5 to 18 carbon atoms in the molecule which are branched in the alpha position such as the vinyl esters of Versatic® acid which are sold under the brand VeoVa®;
  • cyclic and / or acyclic olefins such as ethylene, propylene, but-1-ene, pent-1-ene, hex-1-ene, cyclohexene, cyclopentene, norbones, butadiene, isoprene, cyclopentadiene and / or dicyclopentadiene;
  • amides of alpha.beta-olefinically unsaturated carboxylic acids such as (meth) acrylic acid amide, N-methyl -, N, N-dimethyl-, N-ethyl-, N, N- Diethyl, N-propyl, N, N-dipropyl, N-butyl, N, N-dibutyl and / or N, N-cyclohexyl-methyl- (meth) acrylic acid amide;
  • vinyl aromatic hydrocarbons such as styrene, vinyl toluene or alpha-alkylstyrenes, especially alpha-methylstyrene;
  • nitriles such as acrylonitrile or methacrylonitrile
  • vinyl compounds selected from the group consisting of vinyl halides such as vinyl chloride, vinyl fluoride, vinylidene dichloride, vinylidene difluoride; Vinyl amides such as N-vinyl pyrrolidone; Vinyl ethers such as ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether and vinylcyclohexyl ether; as well as vinyl esters such as vinyl acetate, vinyl propionate and vinyl butyrate;
  • vinyl halides such as vinyl chloride, vinyl fluoride, vinylidene dichloride, vinylidene difluoride
  • Vinyl amides such as N-vinyl pyrrolidone
  • Vinyl ethers such as ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether and vinylcycl
  • Allyl compounds selected from the group consisting of allyl ethers and esters such as propyl allyl ether, butyl allyl ether, ethylene glycol diallyl ether, trimethylol propane triallyl ether or
  • polysiloxane macromonomers which have a number-average molecular weight Mn of 1,000 to 40,000 and an average of 0.5 to 2.5 ethylenically unsaturated double bonds per molecule, such as polysiloxane macromonomers which have a number average molecular weight Mn of 1,000 to 40,000 and an average of 0.5 to 2.5 ethylenically unsaturated double bonds per molecule; especially polysiloxane macromonomers, which have a number average molecular weight Mn of 2,000 to 20,000, particularly preferred
  • the radicals R 1 , R 2 , R 3 and R 4 each independently represent hydrogen atoms or substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl arylalkyl or arylcycloalkyl radicals, with the proviso that at least two of the variables R 1 , R 2 , R 3 and R 4 stand for substituted or unsubstituted aryl, arylalkyl or arylcycloalkyl radicals, in particular substituted or unsubstituted aryl radicals.
  • alkyl radicals examples include methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl, amyl, hexyl or 2-ethylhexyl.
  • Suitable cycloalkyl radicals are cyclobutyl, cyclopentyl or cyclohexyl.
  • suitable alkylcycloalkyl radicals are methylenecyclohexane, ethylenecyclohexane or propane-1,3-diylcyclohexane.
  • Suitable cycloalkylalkyl radicals are 2-, 3- or 4-methyl-, ethyl, propyl or butylcyclohex-1.-yl.
  • Suitable aryl radicals are phenyl, naphthyl or biphenylyl.
  • alkylaryl radicals examples include benzyl or ethylene or propane-1,3-diyl-benzene.
  • Suitable cycloalkylaryl radicals are 2-, 3-, or 4-phenylcyclohex-1 -yl.
  • Suitable arylalkyl radicals are 2-, 3- or 4-methyl, ethyl, propyl or butylphen-1-yl.
  • Suitable arylcycloalkyl radicals are 2-, 3- or 4-cyclohexylphen-1 -yl.
  • radicals R 1 , R 2 , R 3 and R 4 described above can be substituted.
  • electron-withdrawing or electron-donating atoms or organic residues can be used.
  • Suitable substitutes are halogen atoms, in particular chlorine and fluorine, nitrile groups, nitro groups, partially or completely halogenated, in particular chlorinated and / or fluorinated, alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl and Arylcycloalkyl radicals, including those exemplified above, in particular tert-butyl; Aryloxy, alkyloxy and cycloalkyloxy radicals, in particular phenoxy, naphthoxy, methoxy, ethoxy, Propoxy, butyloxy or cyclohexyloxy; Arylthio, alkylthio and cycloalkylthio radicals, in particular phenylthio, naphthylthio, methylthio, ethylthio, propylthio, butylthio
  • Examples of monomers (b) used with particular preference according to the invention are 1,1-diphenylethylene, 1,1-dinaphthaleneethylene, eis or trans-stilbene or vinylidene-bis (4-nitrobenzene).
  • the monomers ⁇ (b) can be used individually or as a mixture of at least two monomers (b).
  • 1,1-diphenylethylene is of very particular advantage and is therefore used with very particular preference in accordance with the invention.
  • each of the above-mentioned monomers with anionic and / or potentially anionic functional groups (a) can be polymerized on its own with the monomer (b). According to the invention, however, it is advantageous to use at least one further monomer (a) which is free from these functional groups, because as a result the profile of properties of the copolymers resulting in stage (1) varies very widely in a particularly advantageous manner and the particular intended use of the dispersions according to the invention can be adapted very specifically.
  • the monomers (a) are preferably selected such that the property profile of the copolymers (A) essentially differs from those described above
  • (Meth) acrylate monomers (a) is determined, the monomers (a), which come from other monomer classes, advantageously and widely varying this property profile in a targeted manner.
  • functional groups are incorporated into the copolymers (A), through which the copolymers (A) become hydrophilic, so that they can be dispersed or dissolved in aqueous media.
  • reactive functional groups can be incorporated which can undergo thermal crosslinking reactions with the complementary reactive functional groups (S 2) described below in the compounds II described below.
  • functional groups can be incorporated which impart self-crosslinking properties to the copolymers (A), such as N-methylol or N-alkoxymethyl or N-methylol ether groups.
  • At least one of the reactive functional groups (S 1) described below which contain at least one bond which can be activated with actinic radiation and which can be activated with actinic radiation in the compounds II described below can be incorporated into the copolymers (A) Bonds can react. Both types of reactive functional groups (S 1) and (S 2) can of course be incorporated into the copolymers (A).
  • the copolymers in question (A) are then curable thermally and with actinic radiation, which experts also refer to as dual-cure.
  • actinic radiation means electromagnetic radiation, such as near infrared (NIR), visible light, UV radiation or X-rays, in particular UV radiation, and corpuscular radiation, such as electron beams.
  • NIR near infrared
  • UV radiation visible light
  • UV radiation UV radiation
  • X-rays UV radiation
  • corpuscular radiation such as electron beams.
  • the copolymer (A) can thus contain at least one, preferably at least two, reactive functional groups (S 2) which can undergo thermal crosslinking reactions with complementary reactive functional groups (S 2) of the compounds II described below.
  • the reactive functional Groups can be introduced into the copolymers (A) via the monomers (a) or introduced after their synthesis by polymer-analogous reactions. Care must be taken to ensure that the reactive functional groups (S 2) do not undergo any undesirable reactions with one another or with the aqueous medium, such as, for example, undesired salt formation, the formation of insoluble precipitates or premature crosslinking, all of which adversely affect the stability of the dispersion according to the invention ,
  • R 5 stands for substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl or arylcycloalkyl radicals.
  • suitable radicals of this type are those listed above for the radicals R 1 , R 2 , R 3 and R 4 .
  • the copolymers (A) are preferably prepared by reacting at least one monomer (b) with at least one monomer (a) which contains at least one potentially anionic or anionic functional group in a first stage (1) to give a copolymer or a macroinitiator , This copolymer or this macroinitiator is then isolated or immediately in the reaction mixture, preferably directly in the reaction mixture, in at least one further step (2) with at least one further monomer (a) which does not contain any potentially anionic, anionic or nonionic hydrophilic groups , preferably a hydrophobic monomer (a), implemented under radical conditions.
  • reaction in stage (2) is preferably carried out after the addition of a small amount or without the addition of an initiator of the radical polymerization.
  • Small amounts are to be understood as amounts which are below the amounts of initiators as used in step (1). This means that reaction in stage (2) can be carried out in the complete absence of an initiator or can be initiated and carried out by the remainder of the initiator used in stage (1) or by an initiator added in a comparable amount.
  • Steps (1) and (2) can also be carried out in succession in one reactor.
  • At least one monomer (a) completely or partially in Depending on the desired application and the desired properties, after which at least one further monomer (a) is added and polymerized by free radicals.
  • at least two monomers (a) are used from the start, the monomer (b) first reacting with one of the at least two monomers (a) and then the resulting copolymer above a certain molecular weight also with the further monomer (s) ( a) responds.
  • the weight ratio of the copolymer or macroinitiator formed in the first stage (1) to the further monomer (s) (a) in the further stage (s) (2) is preferably 1:25 to 5: 1, preferably 1:22 to 4: 1, particularly preferably 1:18 to 3: 1, very particularly preferably 1:16 to 2: 1 and in particular 1:15 to 1: 1.
  • copolymers (A) with block, multiblock, gradient (co) polymer, star and branch structures, which may also be functionalized at the end groups.
  • free radical polymerization initiators that can be used in the first stage (1) are: dialkyl peroxides, such as di-tert-butyl peroxide or dicumyl peroxide; Hydroperoxides, such as cumene hydroperoxide or tert-butyl hydroperoxide; Peresters such as tert-butyl perbenzoate, tert-butyiperpivalate, tert-butyl per-3,5,5-trimethyl hexanoate or tert-butyl per-2-ethyl hexanoate; Potassium, sodium or ammonium peroxodisulfate; Azodinitriles such as azobisisobutyronitrile; CC-cleaving initiators such as benzpinacol silyl ether; or a combination of a non-oxidizing initiator with hydrogen peroxide.
  • dialkyl peroxides such as di-tert-butyl peroxide or dicumyl peroxid
  • the weight ratio of initiator to monomers (b) is preferably 4: 1 to 1: 4, particularly preferably 3: 1 to 1: 3 and in particular 2: 1 to 1: 2. Further advantages result if the initiator is within the stated limits is used in excess.
  • the two- or multi-stage radical copolymerization or copolymerization is preferably carried out in an aqueous medium.
  • the aqueous medium essentially contains water.
  • the aqueous medium may contain minor amounts of solid, liquid or gaseous, low and / or high molecular weight substances, especially bases, provided that these do not negatively influence or even inhibit the copolymerization and / or lead to the emission of volatile organic compounds.
  • the term “minor amount” is understood to mean an amount which does not cancel out the aqueous character of the aqueous medium.
  • the aqueous medium can also be pure water.
  • suitable bases are low molecular weight bases such as sodium hydroxide solution, potassium hydroxide solution, ammonia, diethanolamine, triethanolamine, mono- , Di- and triethylamine, and / or dimethylethanolamine, especially ammonia and / or di- and / or triethanolamine.
  • the aqueous medium used in stage (1) forms at least the total amount, in particular the total amount, of the aqueous medium in which the copolymer (A) is present in dispersion after its preparation.
  • the aqueous medium contains the copolymer formed in step (1) in an amount of 0.1 to 10, preferably 1 to 8 and in particular 2 to, based on the total amount of aqueous medium and copolymer Contains 7 wt .-%.
  • the reactors for the (co) polymerization processes are the customary and known stirred tanks, stirred tank cascades, tubular reactors, loop reactors or Taylor reactors, as described, for example, in the patents DE 198 28 742 A1 or EP 0 498 583 A1 or in the article by K. Kataoka in Chemical Engineering Science, Volume 50, No. 9, 1995, pages 1409 to 1416.
  • the radical copolymerization is preferably carried out in stirred kettles or Taylor reactors, the Taylor reactors being designed so that the conditions of the Taylor flow are met over the entire length of the reactor, even if the kinematic viscosity of the reaction medium changes greatly, in particular increases, due to the copolymerization (cf. German patent application DE 198 28 742 A 1).
  • Decomposition temperature of the monomers used in each case carried out preferably a temperature range from 10 to 150, very particularly preferably 50 to 120 and in particular 55 to 110 ° C.
  • the copolymerization can also be carried out under pressure, preferably under 1.5 to 3000 bar, preferably 5 to 1500 and in particular 10 to 1000 bar.
  • the copolymer (A) is not subject to any restrictions with regard to the molecular weight distribution.
  • the copolymerization is advantageously carried out in such a way that a ratio Mw / Mn, measured using gel permeation chromatography using polystyrene as the standard, results in ⁇ 4, preferably ⁇ 2 and in particular ⁇ 1.5 and in individual cases also ⁇ 1.3.
  • Copolymers (A) are by the choice of the ratio of monomer
  • the content of the copolymer (A) in the dispersion according to the invention can vary widely and depends on the requirements of the individual case.
  • the copolymer (A) is preferably present in the dispersion according to the invention in an amount of 1 to 30% by weight, based on the sum of the essential constituents (A), (B) and (C).
  • the further essential constituent of the dispersion according to the invention are surface-modified, cationically stabilized, inorganic nanoparticles (B) of at least one type, in particular one type.
  • the nanoparticles to be modified are preferably selected from the group consisting of main and subgroup metals and their compounds.
  • the main and subgroup metals are preferably selected from metals of the third to fifth main group, the third to sixth and the first and second subgroups of the Periodic Table of the Elements and the lanthanides.
  • the compounds of the metals are preferably the oxides, oxide hydrates, sulfates or phosphates.
  • the nanoparticles to be modified preferably have a primary particle size ⁇ 50, preferably 5 to 50, in particular 10 to 30 nm.
  • nanoparticles (B) or their surface to be used according to the invention are with at least one compound of the general formula II:
  • L at least divalent organic linking group
  • o an integer from 1 to 5, in particular 1;
  • + p is an integer from 2 to 6, especially 3 or 4;
  • p is an integer from 1 to 6, especially 1 to 4;
  • Compounds II to the surface of the unmodified nanoparticles and / or by chemical reaction of the compounds II with suitable reactive functional groups on the surface of the unmodified Nanoparticles are made.
  • the modification is preferably carried out via chemical reactions.
  • Suitable metals M are those described above.
  • the reactive functional group S is preferably selected from the group consisting of (S 1) reactive functional groups which contain at least one bond which can be activated with actinic radiation, and (S 2) reactive functional groups which contain groups of their type (“themselves ”) and / or enter into thermally initiated reactions with complementary reactive functional groups.
  • S 2) reactive functional groups which contain groups of their type (“themselves ”) and / or enter into thermally initiated reactions with complementary reactive functional groups.
  • suitable reactive functional groups (S 2) are those described above, in particular epoxy groups.
  • a bond which can be activated with actinic radiation is understood to mean a bond which becomes reactive when irradiated with actinic radiation and which undergoes polymerization reactions and / or crosslinking reactions with other activated bonds of its type which take place according to radical and / or ionic mechanisms.
  • suitable bonds are carbon-hydrogen single bonds or carbon-carbon, carbon-oxygen, carbon-nitrogen, carbon-phosphorus or carbon-silicon single bonds or double bonds.
  • the carbon-carbon double bonds are particularly advantageous and are therefore used with very particular preference in accordance with the invention. For the sake of brevity, they are referred to below as "double bonds".
  • the reactive group (S 1) preferred according to the invention contains one double bond or two, three or four double bonds. If more than one double bond is used, the double bonds can be used be conjugated. According to the invention, however, it is advantageous if the double bonds are isolated, in particular each individually in the group (S 1) in question here. According to the invention, it is particularly advantageous to use two double bonds, in particular one double bond.
  • bonds that can be activated with actinic radiation can be formed via carbon-carbon bonds or ether, thioether,
  • Particularly preferred reactive functional groups (S 1) are therefore (meth) acrylate, ethacrylate, crotonate, cinnamate, vinyl ether, vinyl ester, dicyclopentadienyl, norbornenyl, isoprenyl, isopropenyl, allyl or butenyl groups; Dicyclopentadienyl, norbornenyl, isoprenyl, isopropenyl, allyl or butenyl ether groups or dicyclopentadienyl, norbornenyl, isoprenyl, isopropenyl, allyl or butenyl ester groups, but especially methacrylate groups (S 1).
  • variable H stands for a hydrolyzable monovalent group or for a hydrolyzable atom
  • hydrolyzable atoms examples include hydrogen atoms and halogen atoms, in particular chlorine and bromine atoms.
  • the hydrolyzable monovalent groups are preferably used.
  • suitable groups of this type are groups of the general formula III:
  • variable X stands for an oxygen atom, sulfur atom and / or a group> NR 6 , in which R 6 denotes an alkyl group with 1 to 4 carbon atoms, in particular methyl, ethyl, propyl and n-butyl.
  • X preferably represents an oxygen atom.
  • R stands for a monovalent organic radical.
  • the monovalent radical R can be substituted or unsubstituted; it is preferably unsubstituted. It can be aromatic, aliphatic or cycloaliphatic. A monovalent radical R is considered aromatic if X is directly connected to the aromatic radical. This rule applies mutatis mutandis to the aliphatic and cycloaliphatic radicals. Linear or branched, in particular linear, aliphatic radicals are preferably used. Lower aliphatic radicals are preferred, and the aliphatic radicals R 1 described above are particularly preferred. Of these, the methyl groups or the ethyl groups are used with very particular preference.
  • variable L stands for an at least double-bonded, in particular double-bonded, organic linking group.
  • Suitable double-bonded organic linking groups L are aliphatic, aromatic, optionally containing heteroatoms, cycloaliphatic and aromatic-cycloaliphatic
  • Hydrocarbon residues such as
  • divalent polyester residues with recurring polyester components of the formula - (- CO- (CHR 7 ) r CH2-O -) - from.
  • linear polyether residues preferably with a number average molecular weight from 400 to 5,000, in particular from 400 to
  • linear Siioxane residues such as those found in silicone rubbers, hydrogenated polybutadiene or polyisoprene residues, statistical or alternating butadiene-isoprene residues
  • Graft copolymer residues which may also contain copolymerized styrene, and ethylene-propylene-diene residues;
  • Cycloalkanediyl radicals having 4 to 20 carbon atoms such as cyclobutane-1,3-diyl, cyclopentane-1,3-diyl, cyclohexane-1, 3- or - 1,4-diyl, cycloheptane-1, 4-diyl , Norbornane-1,4-diyl, adamantane-1,5-diyl, decalin-diyl, 3,3,5-trimethyl-cyclohexane-1,5-diyl, 1-methylcyclohexane-2,6-diyl, dicyclohexylmethane-4 , 4'-diyl, 1,1'-dicyclohexane-4, 4-diyl or 1,4-dicyclohexylhexane-4,4 "-diyl, in particular 3,3,5-trimethyl-cyclohexane-1, 5-diyl or
  • the linking groups L (1) and L (2) are particularly preferred, very particularly preferably trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, oxapropane-1, 4-diyl or 2- Oxapentane-1,5-diyl and especially trimethylene, oxapropane-1,4-diyl or 2-oxapentane-1,5-diyl are used.
  • variable o stands for an integer from 1 to 5, preferably 1 to 4, preferably 1 to 3 and particularly preferably 1 and 2. In particular, o is 1.
  • Compounds II can also be used in complex form, as is described, for example, in international patent application WO 99/52964, page 8, lines 12 to 20.
  • the compounds II are customary and known and a large part of them are commercially available.
  • Well-suited compounds II are, for example, from the
  • the content of the surface-modified, inorganic nanoparticles (B) in the dispersion according to the invention can vary widely and depends on the requirements of the individual case.
  • the nanoparticles (B) are preferably present in the dispersion according to the invention in an amount of 60 to 98% by weight, based on the sum of the essential constituents (A), (B) and (C).
  • the further essential constituent of the dispersion according to the invention is at least one amphiphile (C).
  • Amphiphiles are known to be molecules which have both hydrophilic and lipophilic properties (cf. Römpp Chemie Lexikon, Georg Thieme Verlag, Stuttgart, New York, 9th edition, 1989, Volume 1, page 176, "Amphiphile”).
  • amphiphiles are preferably selected from the group consisting of monoalcohols, in particular monoalcohols with 3 to 6 carbon atoms in the molecule, and aliphatic polyols, in particular diols with 3 to 12 carbon atoms in the molecule.
  • monoalcohols in particular monoalcohols with 3 to 6 carbon atoms in the molecule
  • aliphatic polyols in particular diols with 3 to 12 carbon atoms in the molecule.
  • highly suitable monoalcohols are propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, amyl alcohol,
  • Neopentyl alcohol or n-hexanol Neopentyl alcohol or n-hexanol.
  • Suitable diols are propylene glycol, trimethylene glycol,
  • Propanol, isopropanol, butanol or isobutanol are particularly preferably used.
  • amphiphile (C) content of the dispersion according to the invention can vary very widely and depends on the requirements of the individual case.
  • the amphiphiles (C) are preferably present in the dispersion according to the invention in an amount of 1 to 10% by weight, based on the sum of the essential constituents (A), (B) and (C).
  • the dispersion according to the invention can also contain further constituents customary in coating.
  • the dispersion according to the invention delivers excellent coatings and coatings, as well as optical moldings and self-supporting films, even without crosslinking agents or additives.
  • the preparation of the dispersion according to the invention does not require any special features in terms of method, but instead takes place in accordance with the customary and known methods of producing aqueous dispersions Mixing the components described above in suitable mixing units such as stirred kettles, dissolvers, Ulrtaturrax, in-line dissolvers, stirrer mills or extruders.
  • suitable mixing units such as stirred kettles, dissolvers, Ulrtaturrax, in-line dissolvers, stirrer mills or extruders.
  • the dispersion according to the invention is used to produce the coatings and coatings according to the invention on primed or unprimed substrates. It is also suitable for all uses described in international patent application WO 99/52964, page 12, line 10, to page 14, line 4, in particular for the production of optical moldings and self-supporting films.
  • Suitable substrates are all surfaces to be painted which are not damaged by hardening of the paints thereon using heat or heat and actinic radiation.
  • Suitable substrates consist, for example, of metals, plastics, wood, ceramics, stone, textiles, fiber composites, leather, glass, glass fibers, glass and rock wool, mineral and resin-bound building materials such as gypsum and cement boards or roof tiles, as well as composites of these materials.
  • the surfaces of these materials can already be pre-painted or pre-coated.
  • primers can be used which are produced in a customary and known manner from electro-diving (ETL). Both anodic (ATL) and cathodic (KTL) electrodeposition coatings, but especially KTL, come into consideration for this.
  • primed or non-primed plastics such as ABS, AMMA, ASA, CA, CAB, EP, UF, CF, MF, MPF, PF, PAN, PA, PE, HDPE, LDPE, LLDPE can also be used , UHMWPE, PET, PMMA, PP, PS, SB, PUR, PVC, RF, SAN, PBT, PPE, POM, PUR-RIM, SMC, BMC, PP-EPDM and UP (short names according to DIN 7728T1) as well as their polymer blends or the fiber-reinforced composite materials produced with these plastics are painted.
  • plastics such as ABS, AMMA, ASA, CA, CAB, EP, UF, CF, MF, MPF, PF, PAN, PA, PE, HDPE, LDPE, LLDPE can also be used , UHMWPE, PET, PMMA, PP, PS, SB, PUR, PVC, RF, SAN, PBT, PPE,
  • non-functionalized and / or non-polar substrate surfaces these can be subjected to a pretreatment, such as with a plasma or with flame treatment, or provided with a hydro primer in a known manner before the coating.
  • the dispersion according to the invention and the coatings according to the invention show particular advantages in automotive series and refinishing as clear and transparent, highly scratch-resistant, high-gloss flexible, acid and water-resistant, firmly adhering, stone-chip-resistant clearcoats in the context of color and / or effect multi-layer coatings.
  • the multi-layer coatings according to the invention can be produced in different ways according to the invention.
  • a first preferred variant of the painting process according to the invention comprises the process steps: (I) producing a basecoat film by applying a waterborne basecoat to the substrate,
  • This variant offers particular advantages particularly when painting plastics and is therefore used with particular preference here.
  • a second preferred variant of the painting process according to the invention comprises the process steps:
  • a third preferred variant of the painting process according to the invention comprises the process steps:
  • a fourth preferred variant of the painting process according to the invention comprises the process steps:
  • the dispersion according to the invention can be applied by all customary application methods, e.g. Spraying, knife coating, brushing, pouring, dipping, watering, trickling or rolling.
  • the substrate to be coated can rest as such, with the application device or system being moved.
  • the substrate to be coated in particular a coil, can also be moved, the application system being stationary relative to the substrate or being moved in a suitable manner.
  • Spray application methods are preferably used, such as, for example, compressed air spraying, airless spraying, high rotation, electrostatic spray application (ESTA), optionally combined with hot spray application, such as hot air hot spraying.
  • the applications can be used at temperatures of max. 70 to 80.degree. C. are carried out so that suitable application viscosities are achieved without there being any change or damage to the dispersion according to the invention and its overspray, which may need to be reprocessed, in the event of brief thermal exposure. So it can Hot spraying can be designed in such a way that the dispersion according to the invention is heated only very briefly in or shortly before the spray nozzle.
  • the spray booth used for the application can be operated, for example, with a circulation that can be tempered, if necessary, which is equipped with a suitable absorption medium for the overspray, e.g. B. the dispersion of the invention itself is operated.
  • the electrocoat layer, filler layer, basecoat layer and clearcoat layer are applied in a wet layer thickness such that, after they have hardened, layers result in the layer thicknesses necessary and advantageous for their functions.
  • this layer thickness is 10 to 70, preferably 10 to 60, particularly preferably 15 to 50 and in particular 15 to 45 ⁇ m; in the case of filler coating, it is 10 to 150, preferably 10 to 120, particularly preferably 10 to 100 and in particular 10 to 90 ⁇ m; in the case of the basecoat, it is 5 to 50, preferably 5 to 40, particularly preferably 5 to 30 and in particular 10 to 25 ⁇ m; and in the case of the clear coatings according to the invention it is 10 to 100, preferably 15 to 80, particularly preferably 20 to 70 and in particular 25 to 60 ⁇ m.
  • the multilayer structure known from European patent application EP 0 817 614 A 1 comprising an electro-dip coating, a first basecoat, a second basecoat and a clearcoat according to the invention, in which the total layer thickness of the first and second basecoats is 15 to 40 ⁇ m and the layer thickness of the first basecoat is 20 to 50% of the said total layer thickness.
  • the filler lacquer layer, base lacquer layer and clear lacquer layer according to the invention can be cured thermally or thermally and with actinic radiation (dual cure).
  • the hardening can take place after a certain rest period. It can have a duration of 30 s to 2 h, preferably 1 min to 1 h and in particular 1 min to 45 min.
  • the rest period is used, for example, for the course and degassing of the paint layers or for the evaporation of volatile components such as solvents.
  • the rest period can be supported and / or shortened by the use of elevated temperatures up to 90 ° C and / or by a reduced air humidity ⁇ 10 g water / kg air, in particular ⁇ 5 g / kg air, provided that there is no damage or changes to the paint layers occur, such as early full networking.
  • the thermal hardening has no special features in terms of method, but takes place according to the customary and known methods such as heating in a forced air oven or irradiation with IR lamps.
  • the thermal hardening can also be carried out in stages.
  • Another preferred curing method is near infrared curing (NIR radiation).
  • NIR radiation near infrared curing
  • a method is particularly preferably used in which the constituent water is rapidly removed from the wet layers. Suitable processes of this type are described, for example, by Roger Talbert in Industrial Paint & Powder, 04/01, pages 30 to 33, "Curing in Seconds with NIR", or in Galvanotechnik, Volume 90 (11), pages 3098 to 3100, “Lackiertechnik, NIR drying every second of liquid and powder coatings «.
  • the thermal curing advantageously takes place at a temperature of 50 to 200 ° C., particularly preferably 60 to 190 ° C. and in particular 80 to 180 ° C for a time of 1 min to 2 h, particularly preferably 2 min to 1 h and in particular 3 min to 45 min.
  • curing with actinic radiation is carried out with UV radiation and / or electron beams.
  • a dose of 1,000 to 3,000, preferably 1,100 to 2,900, particularly preferably 1,200 to 2,800, very particularly preferably 1,300 to 2,700 and in particular 1,400 to 2,600 mJ / cm 2 is preferably used here. If necessary, this hardening can be supplemented with actinic radiation from other radiation sources.
  • electron beams work is preferably carried out under an inert gas atmosphere. This can be ensured, for example, by supplying carbon dioxide and / or nitrogen directly to the surface of the lacquer layers. Even in the case of curing with UV radiation, in order to avoid the formation of ozone, work can be carried out under an inert gas or in an oxygen-depleted atmosphere.
  • the usual and known radiation sources and optical auxiliary measures are used for curing with actinic radiation.
  • suitable radiation sources are flash lamps from VIS1T, high-pressure or low-pressure mercury vapor lamps, which may be doped with lead to open a radiation window up to 405 nm, or electron beam sources.
  • flash lamps from VIS1T high-pressure or low-pressure mercury vapor lamps, which may be doped with lead to open a radiation window up to 405 nm, or electron beam sources.
  • the facilities and conditions of these hardening methods are described, for example, in R. Holmes, UN. and E.B. Curing Formulations for Printing Inks, Coatings and Paints, SITA Technology, Academic Press, London, United Kindom 1984.
  • Further examples of suitable methods and devices for curing with actinic radiation are described in German patent application DE 198 18735 A1, column 10, lines 31 to 61.
  • the radiation which is not directly accessible can be exposed Areas (shadow areas), such as cavities, folds and other design-related undercuts, with spot, small area or all-round emitters, connected with an automatic one
  • Movement device for irradiating cavities or edges, (partially) cured.
  • the curing can take place in stages, i. H. by multiple exposure or exposure to actinic radiation. This can also take place alternately, i. that is, curing alternately with UV radiation and electron radiation.
  • thermal curing and curing with actinic radiation are used together, these methods can be used simultaneously or alternately. If the two curing methods are used alternately, thermal curing can be started, for example, and curing with actinic radiation can be ended. In other cases, it may prove advantageous to start and end the curing with actinic radiation.
  • the multicoat paint systems of the invention have an excellent profile of properties, which is very well balanced in terms of mechanics, optics, corrosion resistance and adhesion.
  • the multi-layer coatings according to the invention thus have the high optical quality and interlayer adhesion required by the market and do not pose any problems such as a lack of condensation resistance, crack formation (mud cracking) or flow disturbances or surface structures in the clear coatings according to the invention.
  • the multicoat paint systems of the invention have an excellent metallic effect, an excellent DOI (distinctiveness of the reflected image), high scratch resistance and excellent surface smoothness.
  • the primed or unprimed substrates according to the invention which are coated with at least one coating according to the invention, have a particularly long useful life with a particularly advantageous application-related property profile, which makes them economically, aesthetically and technically particularly valuable.
  • Feed 1 consisted of 24.4 parts by weight of acrylic acid, 44.0 parts by weight of methyl methacrylate and 3.6 parts by weight of 1,1-diphenylethylene.
  • Feed 2 consisted of 23 parts by weight of a 25% by weight aqueous ammonia solution.
  • Feed 3 consisted of a solution of 5.4 parts by weight of ammonium peroxodisulfate in 138.7 parts by weight of deionized water. Inlets 1 to 3 were metered in over 30 min.
  • the reaction mixture was stirred at 75 ° C. for 1 h. It was then heated to 90 ° C. At this temperature, a monomer mixture was added via an inlet 4 of 260 parts by weight of n-butyl methacrylate, 208 parts by weight of styrene, 334 parts by weight of hydroxyethyl methacrylate and 234.4 parts by weight of ethylhexyl methacrylate were metered in uniformly over a period of 4 hours. After the addition had ended, a post-polymerization at 90 ° C. followed for two hours. The resulting dispersion (A.1) to be used according to the invention had a solids content of 41.8% by weight.
  • the copolymer (A.1) had an electrophoretic mobility ⁇ -2 ( ⁇ m / s) / (V / cm) at pH values from 2 to 7.
  • the electrophoretic mobility was determined using laser Doppler electrophoresis.
  • a Zetasizer ® 3000 from Malvern was used as the measuring device.
  • Preparation example 1 was repeated, except that in the second stage, instead of the monomer mixture described therein, a monomer mixture of 191.7 parts by weight of n-butyl methacrylate, 153.4 parts by weight of styrene, 93.3 parts by weight of hydroxypropyl methacrylate, 424.9 parts by weight of hydroxyethyl methacrylate and 173.1 parts by weight of ethylhexyl methacrylate was used.
  • the resulting dispersion (A.2) to be used according to the invention had a solids content of 41.7% by weight.
  • the copolymer (A.2) had an electrophoretic mobility ⁇ -2 ( ⁇ m / s) / (V / cm) at pH values from 2 to 7.
  • boehmite Disposal® P 3 from Sasol Germany GmbH
  • dilute hydrochloric acid 0.1 N
  • the colloidal solution was then treated in an ultrasound bath for 5 min. The result was the homogeneous boehmite sol (2.1).
  • Preparation Example 2.2 Preparation Example 2.1 was repeated, except that 0.1 N acetic acid was used instead of hydrochloric acid. The result was the homogeneous boehmite sol (2.2).
  • Preparation Example 2.3 Preparation Example 2.1 was repeated, except that 0.1 N formic acid was used instead of hydrochloric acid. The result was the homogeneous boehmite sol (2.3).
  • Preparation example 3.1 20.8 parts by weight of glycidyloxypropyltriethoxysilane were added to 27.78 parts by weight of boehmite sois (2.1) from preparation example 2.1. The resulting reaction mixture was stirred at room temperature for 10 hours. The result was a homogeneous surface-modified boehmite sol (B.1). Production example 3.2:
  • Preparation example 3.1 was repeated, except that instead of the boehmite sol (2.1) from preparation example 2.1, the boehmite sol (2.2) from preparation example 2.2 was used.
  • the surface-modified boehmite sol (B.2) resulted.
  • Preparation example 3.1 was repeated, except that instead of the boehmite sol (2.1) from preparation example 2.1, the boehmite sol (2.3) from preparation example 2.3 was used.
  • the surface-modified boehmite sol (B.3) resulted.
  • the dispersions (B.1) to (B.4) of preparation examples 3.1 to 3.4 were applied pneumatically to test panels which had been coated with a cured electrodeposition coating, filler coating and basecoat (cf. Example 1).
  • the resulting clear lacquer layers V 1 to V 4 were cured at 140 ° C. for 22 minutes.
  • the resulting clear covers V 1 to V 4 were highly scratch-resistant. she could not be produced in layer thicknesses> 30 ⁇ m, because they then showed stress cracks.
  • Preparation example 3.1 was 4.75 parts by weight of the dispersion (A.1) acc.
  • Preparation example 1.1 and 5.0 parts by weight of isopropanol are added. The resulting dispersion was stirred at room temperature for 6 hours.
  • the dispersion according to the invention was completely stable on storage.
  • the viscosity only increased from 0.2 to 0.4 dPas during 30 days of storage at room temperature. After that, clear, transparent, surface-free, highly scratch-resistant coatings could still be produced.
  • the dispersion was applied pneumatically to test panels immediately after its production. For this purpose, it was adjusted to a spray viscosity (DIN 4 discharge cup: 18 s) using a customary and known polyurethane-based rheology aid and sieved (mesh size 5 ⁇ m)
  • the resulting clear covers were free from stress cracks and other surface defects.
  • the clarifications were stone chip resistance (multi-impact: 2 bar, twice 500g steel shot: grade 2 to 3), extremely adhesive (cross cut test and tesa tear test according to DIN EN ISO 2409: GTO / 0), flexible (pendulum hardness according to König: 83) and highly scratch-resistant (delta gloss) according to DIN 67530: after the sand test 4 units; after the brush test: 0 units; after the car wash simulation test: with cleaning with ethanol 4 units, without cleaning 23 units).
  • the paint surface was loaded with sand (20g quartz-silver sand 1.5-2.0 mm).
  • the sand was placed in a beaker (floor cut off flat), which was firmly attached to the test panel.
  • the table with the cup and the sand was shaken by means of a motor drive.
  • the movement of the loose sand caused damage to the paint surface (100 double strokes in 20 s).
  • the test area was cleaned of abrasion, carefully wiped under a cold water jet and then dried with compressed air.
  • the gloss was measured according to DIN 67530 before and after damage (measuring direction perpendicular to the scratch direction):
  • the test panels were stored at room temperature for at least 2 weeks before the test was carried out.
  • the paint surface was damaged with a sieve fabric that was loaded with a mass.
  • the screen fabric and the varnish surface were wetted liberally with a detergent solution.
  • the test panel was moved back and forth under the screen fabric in a lifting motion by means of a motor drive.
  • the test specimen was eraser covered with nylon sieve mesh (No. 11, 31 ⁇ m mesh size, Tg 50 ° C.) (4.5 ⁇ 2.0 cm, wide side perpendicular to the direction of scratching).
  • the coating weight was 2000 g.
  • the screen mesh was renewed, the running direction of the mesh was parallel to the scratch direction.
  • a freshly stirred 0.25% 'Persil strength by weight solution of about 1 was applied before the eraser ml.
  • the number of revolutions of the motor was set so that 80 double strokes were carried out in a time of 80 s.
  • the remaining washing liquid was rinsed with cold tap water and the test panel was blown dry with compressed air.
  • the gloss was measured according to DIN 67530 before and after damage (measuring direction perpendicular to the scratch direction).
  • Example 1 The inventive dispersion of Example 1 was used to produce the clearcoat of Example 2 according to the invention.
  • the dispersion (B.1) from preparation example 3.1 was used to produce the clearcoat of comparative test V 5 which was not according to the invention.
  • the dispersion according to the invention of example 1 and the dispersion (B.1) of preparation example 3.1 were applied pneumatically in wedge form to test panels and cured (cf. the details of example 1).
  • the layer thicknesses ranged from 10 to 80 ⁇ m. While the resulting clearcoat according to the invention showed no stress cracks even at 80 ⁇ m, these occurred in the clearcoat (V 5) according to the invention from a layer thickness of 30 ⁇ m.
  • Example 4 was repeated using propanol instead of butanol.
  • the clear coatings obtained according to the invention had the same outstanding performance properties as the clear coatings (1) to (3) of Examples 1 to 3.
  • Example 4 was repeated using isobutanol instead of butanol.
  • the clear coatings obtained according to the invention had the same outstanding performance properties as the clear coatings of Examples 1 to 4.
  • a hammer according to DIN 1041 (weight without handle: 800 g; handle length: 35 cm) was used to carry out the steel wool scratch test.
  • the test panels were stored at room temperature for 24 hours before the test.
  • the flat side of the hammer was covered with a layer of steel wool and attached to the folded-up sides with tape.
  • the hammer was placed on the clear covers at a right angle.
  • the weight of the hammer was guided in a track over the surface of the clear covers without being misjudged and without additional physical strength.
  • test areas were cleaned of the steel wool residues with a soft cloth.
  • the test areas were evaluated visually under artificial light and graded as follows: Note damage pattern
  • Example 6 was repeated, except that instead of the dispersion (B.2) from preparation example 3.2, the dispersion (B.3) from preparation example 3.3 was used. The same excellent results as in Example 6 were obtained.
  • Example 6 was repeated, except that instead of the dispersion (B.2) from preparation example 3.2, the dispersion (B.4) from preparation example 3.4 was used. The same excellent results as in Examples 6 and 7 were obtained.
  • Example 9
  • Example 1 was repeated, except that the water-based lacquer layer was not cured before the dispersion of the invention was applied, but was predried at 100 ° C. for 10 minutes. The water-based lacquer layer and the clear lacquer layer according to the invention were then cured together at 140 ° C. for 20 minutes.
  • the layer thickness of the clearcoat according to the invention was 35 ⁇ m. It was free from stress cracks and other surface defects.
  • the gloss according to DIN 67530 was over 90 units. It was extremely scratch-resistant (steel wool scratch test: grade 1).
  • Preparation example 3.1 was repeated, except that the alcohol formed by the condensation was removed from the boehmite sol (3.1) of preparation example 3.1 by vacuum distillation at a maximum water bath temperature of 40 ° C.
  • Dispersion was stirred at room temperature for 6 h. She pointed has a volatile organic content of only 5% by weight. Then, as described in Example 1, it was applied to test panels and cured. The resulting clearcoat according to the invention of the multilayer coating had a layer thickness of 35 ⁇ m and was free from stress cracks and other surface defects.
  • Examples 1 and 3 to 5 were repeated, except that instead of the dispersion (A.1) from preparation example 1.1, the dispersion (A.2) from preparation example 1.2 was used.
  • Example 11 to 14 The resulting dispersions according to the invention of Examples 11 to 14 were, as described in Example 1, applied to test panels and cured. The same excellent results as in Examples 1 and 3 to 5 were obtained in the inventive clearcoats of Examples 11 to 14 with a layer thickness of 35 ⁇ m.
  • the clear coatings according to the invention of Examples 11 to 14 were highly scratch-resistant (steel wool scratch test: grade 1).
  • Example 15 The inventive dispersion of Example 15 was mixed with 1.0% by weight, based on the dispersion, of the Byk® 301 leveling agent from Byk Chemie. The resulting dispersion was applied pneumatically to flame-treated polycarbonate substrates (Makrolon® from Bayer AG) and cured at 140 ° C. for 22 minutes.
  • Byk® 301 leveling agent from Byk Chemie.
  • the coated and uncoated polycarbonate substrates were subjected to the steel wool scratch test.
  • the polycarbonate substrates coated with the clearcoat according to the invention showed no visible damage (grade 1), whereas the uncoated polycarbonate substrates were scratched (grade 5).
  • Example 16 The production of a dispersion according to the invention and a clear coating according to the invention on plastic Example 16 was repeated, except that flamed polybutylene terephthalate (PBTP) substrates were used instead of the polycarbonate substrates. The same advantageous results as in Example 16 were obtained.
  • PBTP flamed polybutylene terephthalate

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Abstract

L'invention concerne une dispersion aqueuse ayant un pH compris entre 2 et 7, contenant A) au moins un polymère ou oligomère expansif présentant des groupes fonctionnels anioniques et/ou potentiellement anioniques, B) des nanoparticules anorganiques d'au moins un type, modifiées en surface, stabilisées de façon cationique, et C) au moins un agent amphiphile. L'invention concerne également l'utilisation de ladite dispersion dans la fabrication de revêtements, de corps moulés et de pellicules autoporteuses.
EP03725139A 2002-05-11 2003-05-02 Dispersion aqueuse de nanoparticules anorganiques, procede de fabrication et utilisation Withdrawn EP1504052A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10221010 2002-05-11
DE10221010A DE10221010A1 (de) 2002-05-11 2002-05-11 Wässrige Dispersion von anorganischen Nanopartikeln, Verfahren zu ihrer Herstellung und ihre Verwendung
PCT/EP2003/004646 WO2003095532A1 (fr) 2002-05-11 2003-05-02 Dispersion aqueuse de nanoparticules anorganiques, procede de fabrication et utilisation

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EP1504052A1 true EP1504052A1 (fr) 2005-02-09

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AU (1) AU2003227709A1 (fr)
DE (1) DE10221010A1 (fr)
WO (1) WO2003095532A1 (fr)

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US7488769B2 (en) 2009-02-10

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