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
  • 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
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6633—Compounds of group C08G18/42
  • C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
  • C08G18/664—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
  • C08G18/6644—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203 having at least three hydroxy groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/80—Masked polyisocyanates
  • C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
  • C08G18/8083—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with compounds containing at least one heteroatom other than oxygen or nitrogen
  • C08G18/809—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with compounds containing at least one heteroatom other than oxygen or nitrogen containing silicon
• • 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
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
  • C09D175/06—Polyurethanes from polyesters
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31507—Of polycarbonate
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
  • Y10T428/31573—Next to addition polymer of ethylenically unsaturated monomer
  • Y10T428/31576—Ester monomer type [polyvinylacetate, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
  • Y10T428/31573—Next to addition polymer of ethylenically unsaturated monomer
  • Y10T428/3158—Halide monomer type [polyvinyl chloride, etc.]

Definitions

• the invention relates to protective coatings with at least a two-layer coating structure, the first coating containing an adhesion promoter based on a two-component polyurethane binder containing alkoxysilyl groups and the second coating containing an inorganic coating, a process for producing these protective coatings and their use.
• Plastics are extremely versatile materials with a number of desirable properties.
• one disadvantage of these materials is, for example
• One method of protecting the surface of plastics from such damage is to apply a suitable coating to the plastic
• Substrate The composition of the coating depends primarily on whether the surface is to be protected from mechanical damage, radiation, the effects of chemicals or other environmental influences (e.g. pollution, etc.).
• Transparent plastics such as polycarbonate
• numerous coating materials are known which in particular protect polycarbonates effectively from mechanical damage.
• These are essentially organically modified, inorganic coatings, which are mostly condensation or UV-curing. Examples can be found in J. Sol-Gel Sei. Techn. 1998, 11, 153-159, Abstr. 23 rd Annual Conference in Organic Coatings, 1997, 271-279, EP-A 0 263
• Multilayer coating structures are described, for example, in EP-A 0947520 (example 12) and in WO 98/46692 (examples A and B) or in Surface and Coatings Technology, 1999, 112, 351-357.
• adhesion promoters react both with the plastic surface and with the coating and (covalent) chemical bonds are formed.
• polycarbonates e.g. Aminosilanes, such as aminopropyltrialxysilanes (DE-A 19 858 998).
• the amino group reacts with the polycarbonate surface and the alkoxysilyl residues with the organically modified, silicon-containing inorganic coating.
• these N-H-functional adhesion promoters have the disadvantage that the basic nitrogen function damages the polycarbonate considerably, which is e.g. visually noticeable by a clear yellowing.
• Another disadvantage is that the adhesion of the inorganic coating rapidly decreases when it is aged in water, especially warm water. For example, the film becomes cloudy, bubbles form and finally the film is completely detached.
• the object of the present invention was to provide protective coatings, in particular for polymeric substrates, in order to protect them from mechanical damage and / or environmental influences, such as, for example, UV light or pollution, and to overcome the disadvantages mentioned above, e.g. optical impairments or insufficient weathering stability.
• protective coatings with at least a two-layer coating structure where the first coating can consist of a two-component polyurethane coupling agent containing alkoxysilyl groups and the second coating can consist, for example, of an inorganic coating, substrates, especially polymeric substrates, can effectively protect against mechanical damage and / or radiation damage and / or pollution.
• the present invention relates to a protective coating comprising at least one two-layer coating structure, characterized in that the first coating consists of a two-component polyurethane adhesion promoter (primer) containing alkoxysilyl groups and the second coating consists of an inorganic or organic coating or an inorganic-organic hybrid coating consists.
• first coating consists of a two-component polyurethane adhesion promoter (primer) containing alkoxysilyl groups
• the second coating consists of an inorganic or organic coating or an inorganic-organic hybrid coating consists.
• the first layer of the protective coating according to the invention contains two-component polyurethane adhesion promoters
• Q is a group which is reactive towards isocyanate groups, preferably OH, SH or NHR ls where Ri is for a dC ⁇ alkyl group or C 6 -C 20 aryl group or for -Z-SiX a Y 3 . a stands,
• Z is a linear or branched C 1 -C 12 alkylene group, preferably a linear or branched C 1 -C 4 alkylene group
• X is a hydrolyzable group, preferably C 1 -C 4 alkoxy
• Ci -C 4 alkyl groups are the same or different Ci -C 4 alkyl groups and
• a is an integer from 1 to 3
• the ratio of the groups of the coating resin (D) which are reactive toward isocyanate groups to the isocyanate groups of the curing agent (A) is between 0.5: 1 to 2: 1, preferably between 0.7: 1 and 1.3: 1.
• the polyisocyanate (B) contained in the hardener component (A) preferably has an average NCO functionality of 2.3 to 4.5 and preferably an isocyanate group content of 11.0 to 24.0% by weight.
• the content of monomeric diisocyanates is less than 1% by weight, preferably less. 0.5% by weight.
• the polyisocyanate (B) consists of at least one organic polyisocyanate with aliphatic, cycloaliphatic, araliphatic and / or aromatically bound isocyanate groups.
• the polyisocyanates or polyisocyanate mixtures (B) are non-volatile polyisocyanates made up of at least two diisocyanates with uretdione, isocyanurate, allophanate, biuret, hnino and made by modifying simple aliphatic, cycloaliphatic, arahphatic and / or aromatic diisocyanates - oxadiazinedione and / or oxadiazinetrione structure, as described, for example, in J Prakt.
• Suitable diisocyanates for the preparation of such polyisocyanates are arbitrary
• Phosgenation or by phosgene-free processes for example by thermal urethane cleavage, accessible diisocyanates of the molecular weight range 140 to 400 with ahphatic, cycloophatic, araliphatic and / or aromatically bound isocyanate groups, such as, for. B. 1,4-diisocyanatobutane, 1,6-diisocyanatohexane (HDI), 2-methyl-1,5-diisocyanatopentane, l, 5-diisocyanato-2,2-dimethylpentane, 2,2,4- or
• the starting components (B) are preferably polyisocyanates or polyisocyanate mixtures of the type mentioned with exclusively isocyanate groups bonded ahphatically and / or cyclophosphatically.
• Very particularly preferred starting components (B) are polyisocyanates or polyisocyanate mixtures with a biuret or isocyanurate structure based on HDI, IPDI and / or 4,4'-diisocyanatodicyclohexylmethane.
• Groups of the general formula (I) are, for example, hydroxymethyltri (m) ethoxysilane and alkoxysilyl compounds with secondary amino groups or mercapto groups.
• secondary aminoalkoxysilanes are N-methyl-3-amino propyltri (m) ethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, bis (gamma-tri-methoxysilylpropyl) amine, N-butyl-3-aminopropyltri (m) ethoxysilane, N-ethyl-3-aminosobutyltri (m) ethoxysil or N-ethyl-3-aminoisobutylmethyldi (m) ethoxysilane and the analogous C 2 -C 4 alkoxysilanes.
• R 2 and R 3 represent identical or different (cyclo) alkyl radicals having 1 to 8 carbon atoms
• Preferred compounds of the general formula (LT) are dimethyl maleate and diethyl maleate.
• alkoxysilanes (C) with a functional group of the general formula (I) which is reactive towards isocyanate groups are 3-mercaptopropyltrimethoxysilane and 3-mercaptopropyltriethoxysilane.
• Preferred alkoxysilanes (C) are N-butyl-3-aminopropyl-tri (m) ethoxysilane and 3-mercapto-propyltri- (m) ethoxysilane.
• alkoxysilanes (C) of the general formula (I) can of course also be used to prepare the hardener (A).
• Mixtures which contain alkoxysilanes (C) of the general formula (I) with different functional groups Q are also suitable.
• the polyisocyanate component (B) is modified with alkoxysilanes (C) in a molar NCO / Q ratio of 1: 0.01 to 0.75, preferably in a molar NCO / Q ratio of 1: 0.05 to 0. 4, where Q has the meaning given in the general formula (I).
• Suitable as coating resins (D) which are reactive towards isocyanate groups are polyhydroxyl compounds, such as, for example, trifunctional and / or tetrafunctional alcohols and / or the customary polyether polyols, polyester polyols, polycarbonate polyols and or polyacrylate polyols.
• lacquer binders or lacquer binder components with groups other than hydroxyl groups that are reactive toward isocyanates are also suitable as reaction partners (D) for the hardener (A).
• reaction partners (D) for the hardener (A) include, for example, polyurethanes or polyureas, which can be crosslinked with polyisocyanates on account of the active hydrogen atoms present in the urethane or urea groups.
• Suitable reactants (D) are, for example, also polyamines whose amino groups are blocked, such as, for example, polyketimines, polyaldimines or oxazolanes, from which, under the influence of moisture, free amino groups and, in the case of oxazolanes, free hydroxyl groups are formed which react with the polyisocyanate mixtures can.
• Preferred coating resins (D) are polyacrylate polyols and polyester polyols. In the 2-component PUR binder, the polyisocyanate and / or binder components are generally used in a form diluted with solvents.
• solvents are, for example, butyl acetate, ethyl acetate, 1-methoxy-2-propyl acetate, toluene, 2-butanone, xylene, 1,4-dioxane, diacetone alcohol, N-
• MethylpyrroHdon dimethylacetamide, dimethylformamide, dimethyl sulfoxide or any mixture of such solvents.
• Preferred solvents are butyl acetate, ethyl acetate and diaceto alcohol.
• the solvent-based 2-component PU binder can optionally be used as another
• auxiliaries Components that are added in the coating technology usual auxiliaries.
• auxiliaries are all additives known for the production of lacquers and paints, e.g. inorganic or organic pigments, light stabilizers, paint additives, such as dispersing, leveling, thickening, defoaming and other auxiliaries, adhesives, fungicides, bactericides, stabilizers or inhibitors and catalysts.
• inorganic or organic pigments e.g. inorganic or organic pigments, light stabilizers, paint additives, such as dispersing, leveling, thickening, defoaming and other auxiliaries, adhesives, fungicides, bactericides, stabilizers or inhibitors and catalysts.
• auxiliaries can also be added.
• the second coating of the protective coating according to the invention consists of an inorganic or organic coating or an inorganic-organic hybrid coating.
• Suitable inorganic coatings are, for example, purely inorganic paint systems or also organically modified inorganic paint systems or else layers deposited by means of a plasma process (for example Al 2 O, TiO 2 , SiO, TiC).
• Purely inorganic coating systems are to be understood, for example, as those coatings produced by the sol-gel process which are composed of monomer units which do not carry any organic groups which, given the presence and ideal network structure, could remain as constituents in the network.
• Such monomer units are, for example, tetraalkoxysilanes such as tetra (m) ethoxysilane or metal koxides such as aluminum, titanium or zirconium alkoxide.
• inorganic coating systems can of course also contain inorganic filler particles, such as SiO 2 , Al 2 O 3 , A1OOH.
• Organically modified inorganic coating systems include e.g. to understand such coatings produced by the sol-gel process, which are made up of monomer units which carry organic groups which remain as constituents in the network which forms. These organic groups can be functional or non-functional.
• Monomer building blocks with non-functional organic groups are e.g. to alkylalkoxysilanes, for example methyltri (m) ethoxysilane, arylalkoxysilanes such as phenyltri (rn) ethoxysilane or else to carbosilane compounds as described e.g. in US-A 5679755, US-A 5677410, US-A 6005131, US-A 5880305 or EP-A 947520.
• alkylalkoxysilanes for example methyltri (m) ethoxysilane, arylalkoxysilanes such as phenyltri (rn) ethoxysilane or else to carbosilane compounds as described e.g. in US-A 5679755, US-A 5677410, US-A 6005131, US-A 5880305 or EP-A 947520.
• Monomer building blocks with functional organic groups are e.g. alkoxysilanes containing vinyl, acrylic or also methacrylic groups, such as, for example, vinyltri (m) ethoxysilane, acryloxypropyltri (m) ethoxysilane or methacryloxypropyltri (m) ethoxysilane, and also epoxy-functional alkoxysilanes, such as glycidyloxypropyltri (m) ethoxysilane or also NCO-functional alkoxysilanes, such as 3-isocyanatopropyltri (m) ethoxysilane.
• alkoxysilanes containing vinyl, acrylic or also methacrylic groups such as, for example, vinyltri (m) ethoxysilane, acryloxypropyltri (m) ethoxysilane or methacryloxypropyltri (m) ethoxysilane, and also epoxy-functional alkoxysilanes, such
• Organic coatings are e.g. Polyurethane, melamine resin crosslinking
• sol-gel process A well-known process for producing inorganic sol-gel coatings is the sol-gel process, as described by CJ Brinker and W. Scherer in “Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, Academic Press, New York
• Sol-gel lacquers with high mechanical resistance are also suitable, as described, for example, in US Pat. No. 4,624,870, US Pat. No. 3,986,997, US Pat. No. 4,027,073 EP-A 358,011, US Pat. No. 4,324,712. WO 98/52992 or WO 94/06 807.
• Inorganic-organic hybrid coatings are characterized by the fact that they have both an organic polymer system and an inorganic polymer system. These can be obtained by combining inorganic and organic coatings and can be present side by side or linked. Possible inorganic-organic hybrid coatings are, for example, those in which an organic polymer matrix is modified by adding or incorporating inorganic building blocks. Inorganic building blocks can be, for example, silica sol dispersions in water or in organic solvents and / or hydrolyzates of (organofunctional) alkoxysilanes.
• Essential properties of the protective coating are determined via the chemical composition of the respective coating.
• Inorganic coatings or inorganic-organic hybrid coatings are preferred.
• Organically modified, inorganic coatings are particularly preferred.
• layering for example condensation-crosslinking paint binders which contain at least one multifunctional, cyclic carbosiloxane of the general formula (ILT),
• R 4 for a C 1 -C 8 -alkyl group and / or a C 6 -C 2 o-aryl group, where R 4 may be the same or different within the molecule,
• B represents a radical selected from the group OH, -CC alkoxy, C 6 -C 20 aryloxy, Ci - C 6 acyloxy, preferably OH, methoxy or ethoxy,
• n 2 to 6
• binders are described, for example, in US Pat. No. 6,005,131 (Examples 6-9), WO 98/52992 (Examples 1-2) and EP-A 947 520 (Examples 1-9 and 11-14).
• the inorganic or organic coating or the inorganic-organic hybrid coating can optionally be added as components which are customary in coating technology.
• Usual auxiliaries are all Additives known for the production of paints and coatings, such as, for example, inorganic and / or organic pigments, light stabilizers, paint additives, such as dispersants, flow control agents, thickeners, defoamers and other auxiliaries, adhesives, fungicides, bactericides, stabilizers or inhibitors. Of course, several of the auxiliaries mentioned can also be added.
• light stabilizers is particularly preferred when the polymeric substrate to be protected is highly sensitive as such. This is the case, for example, with polycarbonates.
• organic and / or inorganic light stabilizers are added to the inorganic coating in an amount necessary to protect the polycarbonate.
• Suitable organic sunscreens are available for example under the trade name Tinuvin ® UV-absorber (Ciba Specialty Chemicals GmbH, Lampertheim).
• Another object of the present invention is a method for producing the protective coating, characterized in that in a first step an alkoxysilyl group-containing two-component polyurethane adhesion promoter (primer) and in a second step an inorganic or organic coating or inorganic-organic on a substrate Hybrid coating is applied and, if necessary, a third coating is applied to it in a further step.
• an alkoxysilyl group-containing two-component polyurethane adhesion promoter primer
• Hybrid coating is applied and, if necessary, a third coating is applied to it in a further step.
• the third coating is particularly suitable for protective coatings which contain an organic or inorganic light stabilizer in the second coating, particularly when high demands are placed on the mechanical resistance of the substrate to be protected.
• this third coating can be a scratch and abrasion-resistant coating or a hydrophobic / oleophobic coating.
• Inorganic coatings produced according to the teaching of EP-A 947 520 (Examples 1-9 and 11-14), are preferred as the third coating. This ensures that both the liability of the protective coating on the substrate as well as the protective coating as a whole is completely preserved when weathered.
• the coating structure according to the invention can in principle be applied to any substrates, such as polymer substrates, such as polycarbonate, polymethyl methacrylate,
• ABS polyamide or polyurethane or also on polymeric blends such as Bayblend ® (Bayer AG, Leverkusen), Pocan ® (Bayer AG, Leverkusen), on metals or glass.
• the substrates can also have organic coatings, for example, if an inorganic-organic hybrid coating or inorganic coating is to be applied to the substrate including the coating.
• the coating structure according to the invention is particularly suitable for the protective equipment of abrasion and scratch sensitive substrates.
• Preferred substrates are, for example, thermoplastic polymers, such as polycarbonates, polymethyl methacrylates, polystyrene, polyvinylcyclohexane and its copolymers, acrylonitrile-butadiene-styrene copolymers or polyvinyl chloride or their blends, and transparent polymeric substrates are particularly preferred.
• thermoplastic polymers such as polycarbonates, polymethyl methacrylates, polystyrene, polyvinylcyclohexane and its copolymers, acrylonitrile-butadiene-styrene copolymers or polyvinyl chloride or their blends, and transparent polymeric substrates are particularly preferred.
• the two-component polyurethane primer containing alkoxysilyl groups and the inorganic or organic coating or the inorganic-organic hybrid coating are applied by the application methods customary in coating technology, such as spraying, flooding, dipping, spinning or knife coating.
• the wet lacquer films can be cured both for the primer and for the respective functional coating between the ambient temperature and the softening temperature of the polymeric substrate.
• the curing temperature range is preferably between 20 ° C and 130 ° C (Makrolon ® , Bayer AG, Leverkusen or Lexan ® ,
• the curing temperature range for Makrolon® is particularly preferably between 100 ° C. and 130 ° C. and for Apec HT® between 100 ° C. and 160 ° C. with a curing time of between 30 and 60 minutes.
• hardening at ambient temperature may also be sufficient.
• Another object of the invention is the use of the inventions
• sensitive substrates such as polymeric substrates can thus be effectively protected.
• the protective effect of the protective coating according to the invention remains completely intact even after intensive weathering.
• a polycarbonate sheet protected with the protective coating according to the invention against mechanical damage and UV light can be exposed to boiling deionized water for several days without a loss of adhesion or an optical change being recognizable.
• the protective coating according to the invention thus has an ideal combination of a very high protective effect for the substrate coated according to the invention and very good weathering stability.
• Baysilone ® OL 17 (Bayer AG, Leverkusen), Tinuvin ® 292 (Ciba Specialty Chemicals GmbH, Lampertheim) and or Tinuvin ® 1130 (Ciba Specialty Chemicals GmbH, Lampertheim) were used as coating additives.
• N- (3-trimethoxysilylpropyl) aspartic acid diethyl ester is prepared, according to the teaching of US Pat. No. 5,364,955, example 5, by reacting equimolar amounts of 3-aminopropyltrimethoxysilane with maleic acid diethyl ester.
• Example 2 The same procedure as in Example 2. Table 1 shows the polyisocyanate and alkoxysilane used in the amounts used. The resulting NCO content of the addition product is given in%.
• IPDI isocyanurate
• Alkoxysilane 1 N- (3-trimethoxysilylpropyl) aspartic acid diethyl ester from Example 1
• Alkoxysilane 2 N-butyl-3-aminopropyltrimethoxysilane, (Dynasilan ® 1189, from Degussa-Huls AG)
• Alkoxysilane 3 bis (trimethoxysilylpropyl) amine, (Silques A-l 170, Fa. Wite)
• Alkoxysilane 4 N-methyl-3-ammopropyltrimethoxysilane, (Dynasilan ® 1110, from Degussa-Huls AG)
• Alkoxysilane 5 3-mercaptopropyltrimethoxysilane, (Dynasilan® ® NTNS, Degussa-Huls AG.) Table 1: Examples 3 to 20
• Suitable polyols and auxiliaries for the 2-component PU binders used according to the invention are listed in Table 2.
• Components B1 to B5 are produced by combining the individual components listed in Table 2 in any order and then mixing them at room temperature.
• Polyol 1 trimethylol propane
• Polyol 2 Desmophen ® 670 (Bayer AG, Leverkusen), which is branched a commercially available weak, hydroxyl group-containing polyester 80% in BA with a hydroxyl content of 3.5%, an acid number of 2 mg KOH / g and a viscosity of 2800 mPas (23 ° C)
• Polyol 3 Desmophen ® 800 (Bayer AG, Leverkusen), which is a commercially available, highly branched, hydroxyl-containing polyester, solvent-free with a hydroxyl content of 8.6%, an acid number of 4 mg KOH / g and a viscosity of 850 mPas (23 ° C, 70% MPA)
• Polyol 4 Desmophen ® VPLS 2249/1 (Bayer AG, Leverkusen), which is a commercially available branched, short-chain, solvent-free polyester with a hydroxyl content of 16%, an acid number of 2 mg KOH / g and a viscosity of 1900 mPas (23 ° C ) represents
• a silicon-modified polyisocyanate from Table 1 is combined with one of the polyol mixtures AI to A5 from Table 2 and mixed in an NCO: OH ratio of 1.2: 1.
• the adhesion promoter according to the invention is ready for application.
• Corresponding combinations of the polyol mixture AI to A5 and the silicon-modified polyisocyanates from Table 1 are possible.
• Table 3 contains an example of all possible combinations for the production of the adhesion promoters (primers) that result from Table 1 and Table 2.
• a Makxolon ® panel of the primers previously prepared was Example 21 spun according microns in Table 3 in a layer thickness of approximately 0.1 and cured for 60 minutes at 130 ° C. An inorganic coating was then spun on in a layer thickness of approx. 3 ⁇ m and cured at 130 ° C. for 60 minutes.
• Example 28 The same procedure as in Example 28. However, the adhesion promoter according to the invention from Example 23 (see Table 3) was spun on in a layer thickness of approximately 0.1 ⁇ m. Furthermore, instead of the inorganic described in Example 28
• the nano zinc oxide dispersion was prepared as follows:
• Example 28 The same procedure as in Example 28. Instead of the primer, a non-silicon-modified polyisocyanate was used as the crosslinking agent.
• a non-silicon-modified polyisocyanate was used as the crosslinking agent.
• 100 g of the polyol component A 2 from Table 2 were mixed with 7.2 g of a 70% solution in butyl acetate of an LPDI isocyanurate with an average NCO content of 11.8 % and an NCO functionality of 3.2 and one
• Example 29 The same procedure as in Example 29. Instead of the primer, a non-silicon-modified polyisocyanate was used as the crosslinking agent.
• a non-silicon-modified polyisocyanate was used as the crosslinking agent.
• 100 g of the polyol component A 2 from Table 2 were mixed with 7.2 g of a 70% solution in butyl acetate of an IPDI isocyanurate with an average NCO content of 11.8 % and an NCO functionality of 3.2 and a viscosity of 700 mPas (23 ° C) stirred and spun in a layer thickness of about 0.1 microns.
• Example 28 The same procedure as in Example 28. Instead of the primer, a non-silicon-modified polyisocyanate was used as the crosslinking agent.
• a non-silicon-modified polyisocyanate was used as the crosslinking agent.
• each plate was placed in demineralized water at 100 ° C for 8 hours. siege. Another sample was stored in demineralized water at 65 ° C for 14 days.
• each plate was weathered for 1000 h in accordance with ASTM G 154-97 cycle 4. After weathering, the adhesion was checked using a cross cut DIN EN ISO 2409. The results of the cross-cut test after weathering are summarized in Table 4.
• Tables 4 and 5 demonstrate the effectiveness of the protective coating according to the invention.
• Polymeric substrates e.g. Polycarbonate can be effectively protected against environmental influences and mechanical damage.
• the comparative examples either show less weathering stability and / or offer less protection against mechanical damage.

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• 2001
  • 2001-01-24 DE DE10103026A patent/DE10103026A1/de not_active Withdrawn
• 2002
  • 2002-01-14 JP JP2002558905A patent/JP4102190B2/ja not_active Expired - Fee Related
  • 2002-01-14 CN CNB028040856A patent/CN1309348C/zh not_active Expired - Fee Related
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  • 2002-01-14 WO PCT/EP2002/000262 patent/WO2002058569A1/de active Application Filing
  • 2002-01-14 CA CA002435432A patent/CA2435432A1/en not_active Abandoned
  • 2002-01-14 KR KR1020037009730A patent/KR100854904B1/ko not_active Expired - Fee Related
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