Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D143/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
  • C09D143/04—Homopolymers or copolymers of monomers containing silicon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
  • B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
  • B05D7/26—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials synthetic lacquers or varnishes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/50—Multilayers
  • B05D7/52—Two layers
  • B05D7/53—Base coat plus clear coat type
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/50—Multilayers
  • B05D7/56—Three layers or more
  • B05D7/57—Three layers or more the last layer being a clear coat
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/04—Polysiloxanes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/04—Polysiloxanes
  • C08L83/06—Polysiloxanes containing silicon bound to oxygen-containing groups
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
  • C09D123/26—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment
  • C09D123/32—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing phosphorus or sulfur
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
  • C09D123/26—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment
  • C09D123/36—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing nitrogen, e.g. by nitration
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
  • C09D183/04—Polysiloxanes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
  • C09D183/04—Polysiloxanes
  • C09D183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
  • C09D183/04—Polysiloxanes
  • C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
  • C09D183/14—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16

Definitions

• the present invention relates to moisture-curing coating compositions based on aprotic solvents, containing at least one binder with alkoxysilane groups.
• the invention furthermore relates to a process for producing a multicoat system, in particular an autoreparature coating, and to the multicoat systems prepared by this process.
• Coating compositions comprising binders with alkoxysilane groups have been known for a long time.
• the alkoxysilane groups of the binders are capable, even at room temperature, of condensing one another with the alkoxy groups being removed, forming Si-O-Si bridges.
• Such coating compositions are therefore suitable, for example, for the production of automotive refinish coatings.
• isocyanate-based coating agents they still have the decisive advantage that they are substantially safer from a toxicological point of view, and that therefore the extensive precautionary measures required in the case of isocyanate-based systems can largely be dispensed with.
• EP-B-1 521 790 and WO04 / 022618 disclose coating compositions containing alkoxysilane-functional prepolymers.
• the alkoxysilane-functional prepolymers are obtainable using so-called alpha-silanes, in which the alkoxysilyl group is bonded to a functional group via a methyl spacer.
• isocyanate-functional alpha-silanes and (meth) acryl-functional alpha-silanes are used.
• the alkoxysilyl groups in the presence of catalysts, such as amines, a very high reactivity to moisture. Coating agents can thus be made available that scratch-resistant at room temperature Coatings are curable.
• the disadvantage is that these coating agents have only a very short pot life after addition of the catalysts and contact with atmospheric moisture at a high curing speed, which is not acceptable when using the coating compositions in the field of automotive refinishing.
• ⁇ -ethoxysilane-modified polymers are known, the polymer residue as a variety of flexible, long-chain polymers such as polyesters, polyamides, polyethers, polycarbonates, phenolic resins, polyurethanes, vinyl polymers. Rubbers. Celluloses, silicone resins. Acrylate resins or methacrylate resins may contain.
• the ⁇ -ethoxysilane-modified polymers are preferably obtained by reacting isocyanate-group-containing ⁇ -ethoxysilanes with hydroxyl-containing polymers, preferably with hydroxyl-containing polyethers, polyesters and polyurethanes.
• the ⁇ -ethoxysilane-modified polymers are used in curable compositions such as adhesives, sealants, and coatings.
• these curable compositions may contain up to 80% by weight of fillers and reactive diluents, in particular polyurethanes having at least one alkoxysilane group, and / or plasticizers.
• the curable compositions release little or no methanol when cured. In spite of the lower reactivity associated with the replacement of methoxysilane groups by ethoxysilane groups, they are distinguished by an acceptable curing time.
• EP-B-505 469 and EP-A-263 306 disclose transparent coating compositions comprising alkoxysilane-functional prepolymers, optionally butanol and phosphoric acid as crosslinking catalyst p-toluenesulfonic acid. Tin-based compounds, amines, alkali compounds or salts of alkyl titanic acid included.
• the alkoxysilane-functional prepolymers are obtainable using acrylically unsaturated so-called gamma-silanes, in which the alkoxysilyl group is bonded to an acrylate or methacrylate group via a propyl spacer.
• the resulting prepolymers after the addition of suitable catalysts, have a significantly lower reactivity of the alkoxysilyl groups relative to atmospheric moisture than the corresponding polymers with a methyl spacer.
• high amounts of catalyst are required, but which lead to an insufficient Potlife and poor paint properties.
• di- and trimethoxysilanes can be used, but this is rather undesirable because of the associated methanol elimination during curing.
• DE-A-10 2005 000 823 discloses crosslinkable, silane-modified copolymers which are obtained by polymerization of ethylenically unsaturated ⁇ -silanes with other ethylenically unsaturated monomers. These copolymers are used in the form of the aqueous dispersions, for example in coating compositions for textiles, fibers, wood and paper and construction chemical products such as fillers, plasters, cements u.a. used. However, coating compositions based on aprotic solvents are not described. Also missing in this document information on suitable crosslinking catalysts and other additives.
• WO2007 / 033786 discloses coating compositions which, in addition to silane-group-containing polymers, contain phosphonic diesters and diphosphonic diesters as cross-linking catalysts as components essential to the invention.
• the silane-containing polymers have close 2, preferably at least 3 condensable silane groups. Reaction products of isocyanates with aminosilanes are preferably used.
• thermal curing preferably takes place at elevated temperatures of, in particular, 100 to 160 ° C. for a period of 10 to 60 minutes.
• WO04 / 072189 discloses clearcoats which, in addition to a silane-group-containing polyacrylate resin and a melamine resin, as crosslinking catalyst for the silane groups, contain blocked or unblocked phosphoric acid esters.
• the use of alpha-silanes for the preparation of the silane group-containing polyacrylate resins is not described, so that these polyacrylate resins have insufficient reactivity at low curing temperatures.
• the clear coats / 072,189 described in WO04 be 10 to 45 minutes and cured at 80 to 150 0 C used for the production of OEM clearcoats.
• the present invention was therefore based on the object to provide coating medium available, even at low curing temperatures of up to 90 0 C, in particular of a maximum of 60 ° C, in the presence of moisture show a fast curing, ie they should after curing of 30 min to be tack-free at 60 0 C.
• the coating compositions should have a potlife of at least 30 minutes, preferably at least 2 hours, at room temperature and in contact with moisture. Pot life is understood to mean the period of time within which the coating composition shows first gel particles after contact of the coating composition with moisture.
• the resulting coatings should be free of surface defects and have high transparency (i.e., above all no haze). Furthermore, the coating compositions should have the lowest possible proportion of solvents, ie a possibly high solids content.
• the coating compositions should be simple and very easy to produce reproducible and prepare during the paint application no environmental problems.
• the coating compositions should preferably release as little methanol as possible when they cure.
• a moisture-curing coating composition based on aprotic solvents containing (A) at least one binder with alkoxysilane groups and (B) at least one crosslinking catalyst, characterized in that
• binder (A) at least one polyacrylate and / or polymethacrylate obtainable using one or more ethylenically unsaturated monomers (a1) of the formula (I)
• R hydrogen or methyl radical
• R 1 hydrogen, alkyl or cycloalkyl
• crosslinking catalyst at least one phosphorus- and nitrogen-containing catalyst (B),
• the present invention also provides a process for the production of a multicoat paint system using these coating compositions, in particular for the production of a refinish coating, and the use of this process for the coating of interior or exterior bodywork components or of components for shipbuilding and aircraft construction or of components for household and electrical appliances or plastic moldings or foils.
• the coating compositions according to the invention exhibit rapid curing both in the presence of moisture - ie they are already cured after 30 minutes. tack-free at 60 0 C - as well as simultaneously a pot life min ( "potlife") of at least 30, preferably of at least 2 hours by the at least.
• pot life a pot life min ( "potlife" of at least 30, preferably of at least 2 hours by the at least.
• Proportional use of acrylate- or methacrylate-functional alkoxysilanes with ethoxy groups instead of methoxy groups for the preparation of the binders can furthermore be provided with coating compositions which release as little methanol as possible on curing and which nonetheless exhibit the required rapid curing.
• the coating compositions of the invention lead to coatings with a very good overall appearance (so-called very good appearance).
• the resulting coatings are in particular free of surface defects and have a high transparency.
• the coating compositions according to the invention are distinguished by a higher solids content compared with coating compositions based on hydroxyl-containing acrylate resins of the same molecular weight.
• the coating compositions are simple and very easy to produce reproducible and prepare during the application of paint no environmental problems.
• the coating compositions contain as binder (A) at least one polyacrylate and / or polymethacrylate obtainable by using one or more ethylenically unsaturated monomers (a1) of the formula (I)
• ROI il CH 2 C-CO-CH 2 -SiFr x (OR ' ⁇ (I)
• R hydrogen or methyl radical
• Examples of ethylenically unsaturated monomers of the formula (I) are alpha- Methacryloxymethylmethoxydimethylsilan, alpha-Methacryloxymethyldi- methoxymethylsilan, alpha-methacryloxymethyltrimethoxysilane, alpha-meth acryloxymethylethoxydimethylsilan, alpha-Methacryloxymethyldiethoxy- methylsilane, alpha-methacryloxymethyltriethoxysilane, alpha-methacryloxy methyltriisopropoxysilane, alpha-Methacryloxymethyldiisopropoxymethylsilan , alpha-methacryloxymethylisopropoxydimethylsilane, alpha-methacryloxymethylths (2-methoxyethoxy) silane, alpha-methacryloxymethylbis (2-methoxyethoxy) methylsilane, alpha-methacryloxymethyltripropoxysilane, alpha-methacryloxymethyld
• alpha-silanes can be used individually or in the form of mixtures of 2 or more alpha-silanes for the preparation of binders with alkoxysilane groups.
• Ethoxysilyl-containing binders are preferably used. Compared with binders containing methoxysilyl groups, they have the advantage that when they cure, the toxicologically safer ethanol and not the toxicologically questionable methanol is released. Accordingly, brushing agents are preferred which contain as binder at least one polyacrylate and / or polymethacrylate which is obtainable using one or more ethylenically unsaturated monomers of the formula (II)
• ethylenically unsaturated monomers of the formula (II) as alpha-methacryloxymethylethoxydimethylsilane, alpha-methacryloxymethyldiethoxymethylsilane, alpha-methacryloxymethyltriethoxysilane, alpha-acryloxymethylethoxydimethylsilane, alpha-acryloxymethyldiethoxymethylsilane and / or alpha-acryloxymethyltriethoxysilane.
• Particularly preferred are alpha-methacryloxymethyldiethoxymethylsilane, alpha-methacryloxymethyltriethoxysilane, alpha-acryloxymethyldiethoxymethylsilane and / or alpha-acryloxymethyltriethoxysilane.
• binders (A) used according to the invention if appropriate together with the unsaturated monomer or monomers (a1) of the forms! (!) and / or the unsaturated monomer or monomers of the formula (I!) one or more further ethylenically unsaturated monomers are used.
• Other ethylenically unsaturated monomers which are conventionally used are ethylenically unsaturated monomers, but preferably ethylenically unsaturated monomers without active hydrogen.
• Besen ichtungssch in which the binder (A) with
• Alkoxysilane groups can be obtained by polymerization of
• Particularly suitable as monomer (a2) are alkyl esters of ethylenically unsaturated carboxylic acids without active hydrogen, particularly preferably alkyl esters without further functional group, very particularly preferably alkyl esters of saturated monoalcohols with ethylenically unsaturated carboxylic acids.
• alkyl esters of ethylenically unsaturated carboxylic acids (a2) are alkyl esters and cycloalkyl esters of acrylic, methacrylic, fumaric, crotonic and maleic acid, preferably of acrylic and / or methacrylic acid, such as preferably methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, butyl acrylate, butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, amyl acrylate, amyl methacrylate, hexyl acrylate, hexyl methacrylate, ethylhexyl acrylate, ethyl
• Particularly suitable monomers (a3) are vinylaromatic compounds without active hydrogen.
• suitable vinylaromatic compounds (a3) are vinylaromatic hydrocarbons such as vinyltoluene, alpha-methylstyrene or, in particular, styrene.
• Particularly suitable monomers (a4) are ethylenically unsaturated compounds having at least two polymerisable, ethylenically unsaturated double bonds without active hydrogen.
• suitable ethylenically unsaturated monomers (a4) having at least two polymerisable, ethylenically unsaturated double bonds are diesters of saturated di-alcohols with ethylenically unsaturated carboxylic acids, in particular diesters of saturated dialcohols with acrylic, methacrylic, fumaric, crotonic and maleic acid, acrylic and / or methacrylic acid, such as, for example, hexanediol diacrylate, hexanediol dimethacrylate, glycol diacrylate, glycol dimethacrylate, butanediol diacrylate, butanediol dimethacrylate, trimethylolpropane triacrylate and trimethylolpropane trimethacrylate.
• the monomer (a4) may also be a polycarboxylic acid esterified with an unsaturated alcohol containing a polymerizable double bond.
• a reaction product of a polyisocyanate and an unsaturated alcohol or an amine may also be used as the monomer (a4).
• An example of this is the reaction product of one mole of hexamethylene diisocyanate and two moles of allyl alcohol or the reaction product of isophorone diisocyanate and hydroxyethyl acrylate.
• ethylenically unsaturated compounds (a5) other than the monomers (a1) to (a4) are, in particular, silicon-free monomers without active hydrogen, for example nitriles of the acrylic or methacrylic acid, vinyl esters or vinyl ethers used.
• additional comonomer (a5) to the ethylenically unsaturated monomers (a1) to (a4) up to 10 wt .-%, based on the Sum of (a1) to (a5), of an ethylenically unsaturated carboxylic acid amide.
• suitable carboxylic acid amides are acrylic acid amide, methylacrylamide, itaconic acid diamide, ⁇ -ethylacrylamide, crotonic acid amide, fumaric acid amide and maleic acid diamide.
• compositions in which the binder (A) with alkoxysilane groups is obtainable by polymerization of
• Alkyl esters of ethylenically unsaturated carboxylic acids (a3) 0 to 50% by weight, preferably 10 to 30% by weight, of one or more vinylaromatic compounds,
• the polyacrylate polyols very particularly preferred according to the invention are generally copolymers and preferably have number-average molecular weights Mw between 1,000 and 20,000 daltons, in particular between see 1,500 and 10,000 daltons, each measured by gel permeation chromatography (GPC) against a polymethyl methacrylate standard.
• the free-radical polymerization for preparing the binders with alkoxy silane groups is usually carried out in an organic solvent at temperatures of 80-180 ° C., preferably at 90-160 ° C.
• the free-radical polymerization for the preparation of the AIk- oxysilane-containing polymer is carried out so that a solution of the polymer having a solids content of 40 to 85 wt .-% results.
• solvents for the radical polymerization are non-reactive solvents, such as esters, such. Ethyl acetate, propyl acetate, n-butyl acetate, iso-butyl acetate, ether esters such. As methoxypropyl acetate or butyl glycol acetate, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone, ethers, aromatic, aliphatic, araliphatic and / or cycloaliphatic hydrocarbons and ketones, and mixtures of said solvents in question. Preference is given to using n-butyl acetate, isobutyl acetate, solvent naphtha and / or xylene.
• the polymerization reaction is usually carried out in the presence of an initiator and if appropriate in the presence of a polymerization regulator without active OH or NH groups, preference being given to using mercaptosilanes as regulators.
• a polymerization regulator without active OH or NH groups preference being given to using mercaptosilanes as regulators.
• suitable regulators are the compounds described in International Patent Application WO88 / 02010.
• Suitable initiators are azo initiators, for example azobisisobutyronitrile.
• azobisisobutyronitrile In the case of a low or absent fraction of the polyethylenically unsaturated monomer (a4) used, in particular peroxyesters are used as initiators. An example of this is di-tert.
• Butyl peroxide, di-tert-amyl peroxide, tert-amyl peroxy-2-ethylhexanoate and tert-butyl peroxy-2-ethyl hexanoate called.
• azo Initiators can be used with reactive silicone groups, as described for example in EP-A-159 715 and EP-A-159 716.
• the binders (A) with alkoxysilane groups are preferably used in the coating compositions according to the invention in an amount of from 70.0 to 99.0% by weight, particularly preferably from 85.0 to 95.0% by weight, based in each case on Weight of the nonvolatile constituents of the coating composition according to the invention.
• the coating compositions according to the invention usually contain from 20 to 45% by weight, in particular from 30 to 40% by weight. in each case based on the total weight of the coating agent, one or more solvents, wherein the amount of solvent is given without taking into account the Reaktiwerbeckner.
• catalyst (B) phosphorus and nitrogen-containing catalysts are used. It is also possible to use mixtures of two or more different catalysts (B).
• amine-blocked phosphorus-containing catalysts are amine-blocked phosphonic diesters and / or amine-blocked diphosphonic diesters, preferably from the group consisting of amine-blocked acyclic phosphonic diesters, amine-blocked cyclic phosphonic diesters, amine-blocked acyclic diphosphonic diesters and amine-blocked cyclic diphosphonic diesters and / or amine-blocked phosphoric diesters and / or amine-blocked phosphoric acid monoesters.
• Such unblocked phosphonic diesters and diphosphonic acid diesters suitable for the preparation of the particular amine-blocked catalysts (B) are described, for example, in German patent application DE-A-102005045228.
• catalysts or mixtures of different catalysts are preferably used which, if appropriate with the addition of appropriate solvents, have sufficient solubility in the coating agent so that crystallization of the catalyst is avoided.
• substituted phosphoric monoesters, phosphoric diesters and phosphoric triesters preferably from the group consisting of acetic phosphoric monoesters, acyclic phosphoric diesters and cyclic phosphoric diesters, and acyclic phosphoric triesters are used to prepare the amine-blocked phosphorus-containing catalysts (B).
• the acyclic phosphoric diesters (B) and acyclic phosphoric triesters are in particular from the group consisting of acyclic phosphoric diesters (B) and acyclic phosphoric triesters of the general formula (III):
• substituted and unsubstituted radical of the type mentioned above containing at least one, in particular one, heteroatom selected from the group consisting of oxygen atom, sulfur atom, nitrogen atom, phosphorus atom and silicon atom, in particular oxygen atom, sulfur atom and nitrogen atom
• amine-blocked phosphoric acid esters suitable as catalyst (B) are amine-blocked tributyl phosphate, blocked tris (2-ethylhexyl) phosphate, amine-blocked bis (2-ethylhexyl) phosphate, amine-blocked 2-ethylhexyl phosphate, amine-blocked tris (butoxyethyl) phosphate, amine-blocked tris (Lauryltriethylenglykol) phosphate, amine-blocked bis (lauryltriethylene glycol) phosphate, amine-blocked mono (lauryltriethylenglykol) - phosphate, amine-blocked Dihexadecylphosphat, amine-blocked Diisononylphosphat, amine-blocked Monoisodecylphosphat and amine-blocked commercial alkyl phosphates, such as amine-blocked Korantin SMK from BASF SE.
• Preferred as catalyst (B) are amine-blocked phosphoric acid monoesters and amine-blocked phosphoric diesters, in particular amine-blocked C 2 - to C - ⁇ -alkyl phosphates, for example amine-blocked dibutyl phosphate, amine-blocked bis (2-ethylhexyl) phosphate, amine-blocked 2-ethylhexyl phosphate, amine-dihexadecyl phosphate , amine-blocked Diisononyl phosphate, amine-blocked monoisodecyl phosphate, preferably amine-blocked Ce to Cio-alkyl phosphates and mixtures of two or more of said catalysts used.
• amine-blocked phosphoric acid monoesters and amine-blocked phosphoric diesters in particular amine-blocked C 2 - to C - ⁇ -alkyl phosphates, for example amine-blocked dibutyl
• amine-blocked phosphoric acid monohexylhexyl esters amine-blocked diethylhexyl phosphoric acid esters, amine-blocked phosphoric acid phenyl esters, and mixtures of said catalysts, very particularly preferably amine-blocked phosphoric acid bis (2-ethylhexyl) esters, are used.
• amines with which the phosphoric acid esters or phosphonic acid esters are blocked are in particular tertiary amines, for example bicyclic amines, such as.
• tertiary amines for example bicyclic amines, such as.
• DABCO diazabicyclootan
• DBN diaza bicyclononene
• DBU diazabicycloundecene
• dimethyldodecylamine or triethylamine to call particularly preferred for blocking the phosphorus catalysts tertiary amines are used, which ensure good activity of the catalyst at the curing conditions of not more than 90 ° C and preferably have a boiling point ⁇ 100 0 C at a pressure of 1013.25 mbar. Very particular preference is therefore given to using triethylamine for blocking the phosphorus-containing catalysts.
• Certain amine-blocked phosphoric acid catalysts are also commercially available (e.g., Nacure types from King Industries).
• Nacure types from King Industries
• the Nacure 4167 from King Industries is particularly suitable as a catalyst based on an amine-blocked phosphoric acid partial ester.
• the catalysts are preferably used in proportions of from 0.1 to 10.0% by weight, more preferably in proportions of from 0.5 to 5.0% by weight, very particularly preferably in proportions of from 0.5 to 3.0% by weight .-%, in each case based on the weight of the non-volatile constituents of the coating agent according to the invention used.
• a lower efficiency of the catalyst can be partially compensated by correspondingly higher amounts.
• the coating compositions according to the invention preferably also contain one or more aliphatic monoalcohols (C) 1 other than the solvent since the pot life of the coating compositions is prolonged by this addition.
• suitable monoalcohols (C) are in particular aliphatic primary monoalcohols having 2 to 4 carbon atoms, such as, for example, ethanol, propanol and n-butanol. Preference is given to using n-propanol and / or n-butanol.
• the component (C) is preferably used in an amount of 0 to 20.0 wt .-%, in particular in an amount of 0.5 to 10.0 wt .-%, each based on the weight of the nonvolatile constituents of Be - Layering agent, used.
• the coating compositions may optionally contain one or more reactive diluents.
• suitable reactive diluents are monomeric and / or oligomeric silane-containing compounds, in particular carbamate-functional silanes and / or vinyl-functional silanes.
• suitable reactive diluents are N-trimethoxysilylmethyl-O-methylcarbamate and N-dimethoxy (methyl) silylmethyl-O-methylcarbamate, vinyldimethoxymethylsilane, vinyltriethoxysilane, vinyltrimethoxysilane and vinyltris (2-methoxyethoxy) silane.
• the reactive diluents are preferably used in an amount of 0 to 20% by weight, in particular in an amount of 0.5 to 10.0% by weight, in each case based on the weight of the nonvolatile constituents of the coating composition according to the invention.
• the coating compositions generally contain less than 5 wt .-%, in particular less than 2 wt .-%, each based on the weight of the nonvolatile constituents of the coating composition according to the invention, and more preferably no isocyanate.
• the novel coating compositions generally contain less than 5% by weight, in particular less than 2% by weight, in each case based on the weight of the nonvolatile constituents of the coating composition of the invention, and more preferably no aminoplast resin.
• the coating composition of the invention may comprise at least one conventional and well-known paint additive in effective amounts, i. in amounts preferably up to 30 wt .-%, particularly preferably up to 25 wt .-% and in particular up to 20 wt .-%, each based on the weight of the nonvolatile constituents of the coating composition.
• suitable paint additives are: in particular UV absorbers; in particular light stabilizers such as HALS compounds, benzotriazoles or oxalanilides; - radical scavengers;
• wetting agents such as siloxanes, fluorine-containing compounds,
• Adhesion promoters such as tricyclodecanedimethanol
• Magnesium and sodium magnesium fluorine lithium phyllosilicates of the montmorillonite type Silicas such as aerosils; or synthetic polymers having ionic and / or associative groups, such as polyvinyl alcohol, poly (meth) acrylamide, poly (meth) acrylic acid, polyvinylpyrrolidone, polystyrene-maleic anhydride or ethylene
• the coating composition of the invention may contain further pigments and / or fillers and serve for the production of pigmented topcoats.
• the pigments and / or fillers used for this purpose are known to the person skilled in the art.
• the coating compositions according to the invention are prepared by customary methods by processing the alkoxysilane-containing binder (A), organic solvent, optionally the aliphatic monoalcohol (C) and auxiliaries and additives by mixing and optionally dispersing to give a coating composition and, shortly before use, the catalyst (B) is mixed.
• the application of the coating compositions according to the invention can be carried out by all customary application methods, such as, for example, spraying, knife coating, brushing, dipping, pouring, impregnating, trickling or rolling. It can do that too Coating substrate as such rest, wherein the application device or -anläge is moved.
• the substrate to be coated in particular a coil, can also be moved, with the application system resting relative to the substrate or being moved in a suitable manner.
• injection application methods are used, such as compressed air spraying, airless spraying, high rotation, electrostatic spray application (ESTA), pneumatic spray application with a spray gun, the pneumatic spray application with a spray gun being particularly preferred.
• compressed air spraying airless spraying
• high rotation high rotation
• electrostatic spray application ESA
• pneumatic spray application with a spray gun the pneumatic spray application with a spray gun being particularly preferred.
• the curing coating composition according to the invention has no special features, but can be carried out at ambient temperature or elevated temperatures of up to 200 0 C.
• the curing is carried out at ambient temperature or at slightly elevated temperatures of not more than 90 0 C, in particular of not more than 60 ° C.
• the thermal curing at temperatures of up to 90 0 C can be done with conventional and known devices, such as fan heaters and radiant heaters, which radiate near and far infrared.
• the temperatures used and the duration of the heating depend on the requirements of the individual case, in particular on the reactivity of the thermally curable constituents, and can be selected and adjusted by the skilled person in a simple manner on the basis of his general knowledge and craftsmanship.
• the curing takes place at a temperature of 20 to 9O 0 C, preferably from 40 up to 60 0 C, for a time of 1 minute to 10 hours, particularly preferably from 20 min up to 5 h.
• the coating compositions described are particularly suitable for the refinish of passenger car Bodywork including refinishing of original paintwork in the line and / or for the coating of plastic moldings or plastic attachments for passenger car bodies, in particular for passenger cars of superclass such.
• bodies of vehicles in particular motor vehicles such as motorcycles, buses, trucks or cars
• parts thereof or of components for shipbuilding and aircraft construction, automotive OEM painting
• coating of buildings indoors and outdoors of furniture, windows and doors; of plastic moldings, in particular CDs and windows; of industrial small parts, of coils, containers and packaging; of white goods; of components for household and electrical appliances, of films; be used by optical, electrical and mechanical components as well as glass hollow bodies and everyday objects.
• the coating compositions of the invention provide new cured coatings, especially refinishes, with a very good overall appearance (so-called very good appearance).
• the resulting coatings are in particular free from surface defects and have a high transparency.
• the coating compositions of the invention are characterized by rapid curing in the presence of moisture and at the same time have a pot life of at least 30 minutes, in particular of at least 2 hours.
• Acrylate-functional alkoxysilanes with ethoxy instead of methoxy groups for the preparation of the binders it is also possible to provide coating compositions which release as little methanol as possible on curing and which nevertheless exhibit the required rapid curing. Examples
• the double-walled 4 l stainless steel kettle, equipped with a thermometer, anchor stirrer, 2 dropping funnels and reflux condenser, is charged with the solvent listed in Table 1 for polymerization ( receiver).
• the monomer mixture indicated in Table 1 is introduced into the second dropping funnel, the intiator solution indicated in Table i.
• the original is heated to a polymerization temperature of 145 ° C.
• the initiator feed is started first. 15 minutes after the start of the initiator feed, the monomer feed (duration 240 minutes) is started. The initiator feed is adjusted so that it continues to run for another 30 minutes after the end of the monomer feed. After completion of the Initiatorzulaufes the mixture is stirred for a further 2h at 145 ° C.
• the coating compositions of Examples 1 to 3 and Comparative Example C1 according to the invention are prepared by mixing.
• the coating compositions thus obtained are then applied directly to each 2 glass panels by means of a box doctor blade in a wet film thickness of about 100 .mu.m.
• a glass sheet is allowed to store at room temperature, the other is dried after 15 minutes of flash-off for 30 minutes at 60 0 C in a convection oven.
• the assessment of the paints is done according to the following criteria:
• An aluminum strip with a thickness of approx. 0.5 mm, a width of 2.5 cm and a length of approx. 11 cm is bent at a 110 ° angle so that an area of 2.5 x 2.5 cm is created.
• the long side of the sheet is bent after another 2.5 cm by about 15 ° so that the sheet is held in balance by a centered on the square surface placed weight of 5 g.
• To measure the freedom from tack after ZTT the bent sheet metal is placed on the paint film and weighted for 30 s with a weight of 100g. After removal of the weight of the paint is considered tack-free, if the sheet metal angle falls within 5 s. The test is repeated every 15 minutes. Before using the test, the tackiness of the paint film is qualitatively assessed by touch.
• the hardness of the paint films is determined by means of pendulum damping according to Koenig according to DIN 53157. Indicated are the pendulum strokes.
• Table 3 Composition of the coating compositions in parts by weight and test results of the resulting coating Explanatory notes to Table 3: 1) Commercially available catalyst from King Industries based on an amine-blocked phosphoric acid partial ester, 25% strength in isopropanol
• Example 1 shows that the alpha-silanes have a significantly higher reactivity than the comparable gamma-silanes. This is particularly evident in the achievement of freedom from tack (ZTT test) and the higher final hardness after 7 days of storage. Despite this high reactivity of the alpha-silanes, however, according to the invention it is possible to produce coatings! with a sufficient Potlife to provide, as the inventive examples 1 to 3 show.
• the coating compositions of Examples 4 to 6 and Comparative Examples C2 to V7 according to the invention are prepared by mixing.
• the catalyst solutions used are obtained as follows:
• Table 4 Composition of the coating compositions in parts by weight and test results of the resulting coating Explanatory notes to Table 4:
• the coating compositions of Examples 7 to 10 according to the invention are prepared by mixing.
• the coating compositions thus obtained are then applied directly to each 2 glass panels by means of a box doctor blade in a wet film thickness of about 100 .mu.m.
• a glass sheet is allowed to store at room temperature, the other is dried after 15 minutes of flash-off for 30 minutes at 60 0 C in a convection oven.
• the assessment of the paints is done according to the criteria mentioned in Examples 1 to 6:
• Table 7 Composition of the coating compositions in parts by weight and test results of the resulting coating

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• 2009
  • 2009-04-03 DE DE102009016195A patent/DE102009016195A1/de not_active Withdrawn
• 2010
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