Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/08—Homopolymers or copolymers of acrylic acid esters
• • 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
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/002—Priming paints
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
  • C08K5/34—Heterocyclic compounds having nitrogen in the ring
  • C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
  • C08K5/3477—Six-membered rings
  • C08K5/3492—Triazines
• • 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
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
• • 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
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/48—Stabilisers against degradation by oxygen, light or heat
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
  • C08K5/34—Heterocyclic compounds having nitrogen in the ring
  • C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
  • C08K5/3477—Six-membered rings
  • C08K5/3492—Triazines
  • C08K5/34926—Triazines also containing heterocyclic groups other than triazine groups

Definitions

• the present invention relates to a composition containing
• a) 100,000 parts by weight of a primer composition suitable as an adhesion promoter between a thermoplastic substrate and a siloxane-based topcoat and containing (al) binder material, solvent (a2), and UV absorber (a3);
• R 6 branched or unbranched Ci-C) 3 alkyl, C 2 -C 20 -alkenyl, C 6 -Q 2 -AIyI or -CO-Ci-C 8 - alkyl,
• R 7 H or branched or unbranched Q-Cg-alkyl
• R 8 C, -C, 2- alkyl; C 2 -C ) 2- alkenyl or C 5 -C 6 -cycloalkyl,
• composition has a viscosity of 40sec to 140sec measured according to DIN EN ISO 2431 at 23 ° C and a 2mm cup.
• thick primers these are adhesion-promoting lacquers (so-called primers) mostly based on organic binder materials with layer thicknesses measured after curing the coating of ⁇ l microns
• primers adhesion-promoting lacquers
• paint formulation comprising the primer composition of a thick primer plus specific solid and liquid additives, in the form of a specific UV absorber and suitable solvents, as well as the multi-layered products prepared with this paint formulation.
• These multilayered products have a first layer consisting of a plastic substrate, a second layer consisting of the cured primer layer based on the paint formulation according to the invention produced by the process according to the invention and a third layer consisting of a cured topcoat.
• the UV protection effect in this variant is lower compared to the use of the UV absorber in primer and / or topcoat.
• the protective effect is limited by the limited compatibility of organic UV absorbers in the siloxane-based topcoat. Accordingly, an additional UV protection effect by additional or sole use of a UV absorber in the primer makes sense.
• US 6350521 describes a primer which contains both unsilylated and silylated dibenzoylresorcinol derivatives When using a UV absorber in the primer, a high UV absorbance and thus good UV protection function is achieved over a high layer thickness.
• This high layer thickness of so-called thick primers is again achieved by a high solids content of the paint, which ensures that when the paint is applied to the component, a large amount of the paint material to be cured or to be dried remains after it has been flashed off.
• This high solids content in turn is associated with a high viscosity and thus difficult processing.
• a high viscosity leads to high differences in layer thickness during flooding or immersion of the components along the flood or dip direction, a so-called layer thickness wedge. This occurs especially in large and complicated shaped 3-D parts. Since the level of properties of a lacquer is approximately the same only in a relatively narrow layer thickness window, these large differences in layer thickness lead to property losses of the component, such as e.g. Reduced weathering stability or increased susceptibility to cracking of the topcoat to be coated over the thick primer.
• an object was to provide a UV protection primer with good UV protection effect with good, i. same or better processability.
• a) 100,000 parts by weight of a primer composition suitable as an adhesion promoter between a thermoplastic substrate and a siloxane-based topcoat and containing (al) binder material, solvent (a2), and UV absorber (a3);
• R 8 C-C 1 alkyl; C 2 -C 12 alkenyl or C 5 -C 6 cycloalkyl,
• composition has a viscosity of 40sec to 140sec measured according to DIN EN ISO 2431 at 23 ° C and a 2mm cup.
• plastic parts can be coated better with the compositions according to the invention, which is also more complicated in (a) a narrower layer thickness distribution on the component, (b) a clean drainage of the paint on the drip edge of the component, (c) a better coatability 3-D components in the sense of a more homogeneous distribution of the paint on the component noticeable, without sacrificing the UV protection, namely a comparable absorbance at 340 nm despite lower layer thickness.
• the invention therefore also relates to a multilayer product obtained by curing the above-described composition according to the invention.
• the layer structure comprises:
• thermoplastic substrate with one located thereon
• the primer layer is obtained by curing the composition according to claim 1.
• a topcoat layer may be included.
• composition means a mixture of individual components, which may or may not react with each other during or after the mixture, and macroscopically a composition is substantially homogeneous.
• primer composition in the context of the present invention means the typical and suitable thick primer formulations consisting of an (al) binder material in a solvent (a2) and a UV absorber (a3) and possibly further (a4) additives or stabilizers such as antioxidants, hindered amines or dyes or inorganic fillers.
• Suitable solvents (a2) are organic solvents such as alkanes, alcohols, ethers, esters or ketones, although emulsions of polyacrylate in water or water-based solvent mixtures are also suitable in principle.
• Suitable UV absorbers (a3) are derivatives of the following general groups, 2-hydroxybenzophenones, 2- (2-hydroxyphenyl) benzotriazoles, 2- (2-hydroxyphenyl) -1, 3,5-triazines, oxalanilides, 2-cyanoacrylates, benzilidine malonates and formamidines.
• These primer formulations are known in principle and are disclosed in detail, for example, in US Pat. Nos. 5,309,195, 5,04,1133 and 4,410,594.
• SHP470 from Momentive Performance Materials Inc. is a polymethylmethacrylate-based adhesion promoter including 1-methoxy-2-propanol and diacetone alcohol as solvent and dibenzoylresorcinol as UV absorber.
• the ready-to-use diluted SHP 470 (solids content about 6% by weight) has a viscosity of> 90 sec measured according to DIN EN ISO 2431 at 23 ° C. and a 2 mm beaker.
• This primer is used for adhesion promotion between polycarbonate substrate and polysiloxane topcoats, here preferably the AS4700 from Momentive Performance Materials Inc. US 6350521 describes a primer which contains both unsilylated and silylated dibenzoylresorcinol derivatives.
• suitable as adhesion promoter between a thermoplastic substrate and a siloxane-based topcoat means that the primer improves the adhesion of a siloxane-based topcoat to a thermoplastic substrate.
• Component (b) are solvents which must be compatible with a first layer to the plastic substrate to the extent and dispersing, application and flash to the extent to enable the composition to obtain a multi-layered product having high transparency and low haze upon curing of the composition to a second layer.
• solvents may be, for example and preferably, alkanes, alcohols, ethers, esters or ketones.
• solvents are also understood as meaning solvent mixtures. Particular preference is given to using alcohols (with the exception of methanol), ethyl acetate and butanone.
• solvents or solvent mixtures selected from at least one of the group consisting of diacetone alcohol (CH 3 ) 2 C (OH) CH 2 C (OO) CH 3 , ethyl acetate, methoxypropanol and butanone.
• Component (c) are derivatives of biphenyl triazine of the following formula (I):
• X is OR 6 , OCH 2 CH 2 OR 6 , OCH 2 CH (OH) CH 2 OR 6 or OCH (R 7 ) COOR 8 , preferably OCH (R 7 ) COOR 8 ,
• R 6 branched or unbranched Cj-C
• R 7 H or branched or unbranched Q-Cg-alkyl, preferably CH 3 and
• R 8 C 1 -C 2 -alkyl; C 2 -C ) 2 alkenyl or C 5 -C 6 cycloalkyl, preferably C 8 H 17 .
• the compound has the CAS No. 204848-45-3 and is available from Ciba Specialty Chemicals under the name Tinuvin 479 (hereinafter also CGL 479).
• biphenyl-substituted triazines of general formula (I) and their preparation are known from WO-A 96/28431; DE-A 197 39 797; WO-A 00/66675; US 6,225,384; US 6,255,483; EP-A 1 308 084 and DE-A 101 35 795.
• the UV absorbers have a high UV absorption in the range of the greatest sensitivity of the first layer, particularly preferably the UV absorbers have a UV absorption maximum between 300-340 nm.
• the UV absorbers of the formula (I) are preferably used with 2-hydroxybenzophenones as preferred UV absorbers (a3).
• Preferred 2-hydroxybenzophenones are dibenzoylresorcins.
• Preferred dibenzoylresorcinols are compounds of the formula (IIa) and / or (IIb)
• each A is independently a substituted or unsubstituted monocyclic or polycyclic aromatic radical and the substituted monocyclic or polycyclic aromatic radical has substituents selected from the group consisting of hydrogen, halogens, alkoxy groups, C 1-6 alkyl groups, and hydroxy groups and R Is hydrogen or a linear or branched aliphatic chain having less than 10 carbon atoms.
• A is independently of each other preferably phenyl or 4-tert-butylphenyl.
• R is preferably H, propyl or 3-triethoxysilylpropyl.
• the preferred UV absorbers of the formulas (IIa and IIb) are 4,6-dibenzoylresorcinol, 4,6-di- (4-tert-butylbenzoyl) resorcinol, 4,6-dibenzoyl-2-propylresorcinol, 2, 4,6-Tribenzoylresorcinol and 4,6-dibenzoyl-2- (3-triethoxysilylpropyl) resorcinol.
• UV absorbers of the formula (I) and UV absorber a3 are preferably used in a weight ratio of from 1 to 0.01 to 100, preferably 1 to 0.05 to 50 and more preferably 1 to 0.1 to 20, based on the total UV Absorber amount used.
• Suitable plastic substrates for the first layer of the multilayered products in this invention are polycarbonate, polyestercarbonate, polyesters (such as polyalkylene terephthalate), polyphenylene ethers, graft copolymers (such as ABS), and mixtures thereof.
• the first layer is preferably polycarbonate, in particular homopolycarbonate, copolycarbonate and / or thermoplastic polyester carbonate.
• primer layers suitable for this invention for the second layer of the multilayered products are the layers resulting from the coating formulation of the invention by curing.
• curing here includes both chemical crosslinking and drying without reaction depending on the type of primer used.
• UV absorber component (c)
• component (c) Preference is given to an addition of UV absorber (component (c)) of from 0.01% by weight to 30% by weight, based on the solids content of the formulation, more preferably from 0.1 to 15% by weight, preferably one high UV absorber addition, albeit highly diluted.
• the addition of the individual components can take place successively or simultaneously, but it is preferred to add component (c), dissolved at least in one part of component (b), to component (a) and possibly the rest of component (b).
• SHP470 is a polymethylmethacrylate-based adhesion promoter with, inter alia, 1-methoxy-2-propanol and diacetone alcohol as solvent and dibenzoylresorcinol as UV absorber.
• the ready-to-use diluted SHP 470 (solids content about 6% by weight) has a viscosity of> 90 sec measured according to DIN EN ISO 2431 at 23 ° C and a 2mm cup.
• This primer is used for adhesion promotion between polycarbonate substrate and polysiloxane topcoats, here preferably the AS4700 from Momentive Performance Materials Inc.
• the SHP470 (component (a)) is diluted to 20 to 95%, particularly preferably 25 to 90%, preferably with alcohols (component (b)), particularly preferably with diacetone alcohol, methoxypropanol or mixtures thereof, which then gives a solids content from about 2 to 9.5 wt .-%, preferably 2.5 to 9 wt .-%, and with 0.01 to 15 wt .-%, preferably 0.1% to 10 wt .-%, particularly preferably 1% to 7% by weight (based on the solids content of component a) of a triazine UV absorber (component (c)), preferably of a biphenyltriazine UV absorber of the general formula (I), particularly preferably of the UV absorber CGL479) and homogenized in the meantime and / or subsequently in a
• component (c) in diacetone alcohol, methoxypropanol or mixtures thereof and thus add it to the SHP470.
• the ideal dilution ratio depends on the dimension and geometry of the component as well as the paint application and should be adapted in individual cases.
• the ratio is 5% by weight of CGL 479, based on the solids content of SHP470, of about 6% by weight solids content, an extinction of about 1.2 being achieved at a layer thickness of 1 ⁇ m. This is the case with SHP470 without additional UV absorber only at 2 ⁇ m the case.
• cover layers for the third layer of the multilayered products which are suitable in the context of this invention are the layers formed from suitable topcoats by curing.
• topcoats are formulations of scratch-resistant or abrasion-resistant lacquers, for example but not exclusively polysiloxane lacquers, as are known, for example, from US 4,3730,61, US Pat. No. 4,410,594, US Pat. No. 5,041,313 or US Pat. No. 5,391,795, furthermore silicate coatings (US Pat. Water glass) and nanoparticle-containing formulation, which can be applied to the second layer, the primer, and then cured to a well-adherent multi-layer product.
• silicate coatings US Pat. Water glass
• nanoparticle-containing formulation which can be applied to the second layer, the primer, and then cured to a well-adherent multi-layer product.
• the invention also provides a process for producing a multilayered product, wherein
• the second layer in the form of the paint formulation according to the invention is applied to the first layer, which is preferably made of the thermoplastic polymer, particularly preferably polycarbonate, by injection molding or extrusion plastic molded part of any shape, and (ii) in a second step, the primer formulation of the second layer is cured, wherein the term cure here includes both chemical crosslinking and drying without reaction depending on the type of primer used, and
• the paint formulation is applied to the surface of the first layer by flooding, dipping, spraying, rolling, Aufschleudem or other suitable method and then in the second step at room temperature and / or elevated temperature (preferably at 20 - 200 0 C, more preferably at 40 - 130 0 C) cured.
• the surface of the first layer may be pretreated by purification or activation.
• the application and curing (step (iii) and (iv)) depends on the type of topcoat used.
• this multi-layered product represents a glazing such as architectural glazings, automobile glazing, headlight lenses, spectacle lenses or helmet visors.
• the solids content of the paints was determined with the aid of solid tester Sartorius MA40, wherein a weighted paint sample was evaporated at 140 0 C, until constant weight attained. The solids content then results in percent from the quotient mass to mass before evaporation.
• the solids content of the paint after curing of the paint is in the simplest case paint weight minus solvent weight.
• the viscosities of the lacquer solutions were determined in accordance with DIN EN ISO 2431 with flow cups from Erichsen, wherein the flow cup has a nozzle of 0 4 mm or 0 2 mm, in seconds at 23 ° C.
• the layer thickness of the cured lacquers is determined by white light interference with the aid of the measuring device Eta SD30 from Eta Optik GmbH, Germany
• the extinction of the primer after application to a polycarbonate substrate and subsequent hardening was determined using a Cary 50 UV-Vis spectrophotometer from Varian Inc., USA, using an uncoated but otherwise identical polycarbonate substrate as the background spectrum.
• This varnish was (in the flow coating process to a polycarbonate plate (injection-molded polycarbonate PC) plates in optical quality from Makrolon ® 2808 (Bayer MaterialScience AG; medium-viscosity bisphenol A polycarbonate, MFR 10g / 10min according to ISO 1133 at 300 0 C and 1.2kg 10.5 x 15 x 0.32 cm) without UV stabilization), flashed for 30 min and cured at 125 ° C for 15 min.
• a layer thickness of 4.4 ⁇ m was determined in the direction of the flood from the inflow edge to the drip edge already after 3 cm (ie still in the flooding region) on the plate, which increases to 8.8 ⁇ m up to 3 cm before the drip edge (ie at 12 cm).
• the paint according to the manufacturer's specification Since the paint according to the manufacturer's specification has its ideal property profile in a layer thickness window of 2 to 4 ⁇ m, it must be thinned here - with the coating method used and the component to be painted - in order to achieve a lower, specification-compliant layer thickness on the component. Outside the specification-compliant layer thickness, ie below 2 ⁇ m or above 4 ⁇ m, a lack of weather resistance is observed. This lack of weathering stability manifests itself in the fact that these samples precipitate significantly earlier due to delamination or cracking during weathering compared to samples whose layer thickness is within the 2 to 4 ⁇ m limit.
• a stock solution of the commercially available Dickprirner SHP 470 solids content 9.90% & viscosity 4 mm beaker 46.25 s (determination see method A & B) and a 1: 1 solvent mixture of diacetone alcohol and 1-methoxy-2-propanol prepared by adding 300.0 g of SHP 470 (9.9% by weight) and admixing with stirring 97.5 g of diacetone alcohol and 1-methoxy-2-propanol each time The resulting solution is called stock solution 2 A.
• polycarbonate plates injection molded polycarbonate sheets in optical quality from Makrolon ® 2808 (both by the flow Bayer MaterialScience AG; medium-viscosity bisphenol A polycarbonate, MFR log / Lomin according to ISO 1133 at 300 0 C and 1.2 kg, without UV stabilization) of size 10.5 ⁇ 15 ⁇ 0.32 cm
• polycarbonate plates injection molded polycarbonate sheets in optical quality from Makrolon ® 2808 (both by the flow Bayer MaterialScience AG; medium-viscosity bisphenol A polycarbonate, MFR log / Lomin according to ISO 1133 at 300 0 C and 1.2 kg, without UV stabilization
• the absorbance was determined only the primer (uncoated Makrolon ® 2808 as the background spectrum) at 340 nm as a function of experimentally determined coating thickness (determined according to method C) at each measuring point according to method D.
• Table 2 shows that the SHP 470 has an extinction contribution of 1.2 at 340 nm without additional UV-absorbing additives (stock solution A) at the minimum layer thickness according to the manufacturer's specification of 2 ⁇ m.
• the minimum layer thickness is here primarily by the necessary for the overall property profile of the paint extinction contribution of the primer according to Lambert-Beer 's law
• this listing shows that the minimum extinction contribution of the pure SHP 470 (Example 2A) for the overall paint properties is 1.2 at 340nm (ie the minimum layer thickness of 2 ⁇ m (according to the manufacturer's specification) for the CGL 479 offset Example 2B (2% by weight CGL 479) and 2C (5% by weight CGL 479) are already achieved at 1.5 ⁇ m and 1 ⁇ m, respectively, without adversely affecting the processing properties such as solids content and viscosity of the diluted lacquer.
• the processing window of the SHP 470 increases in terms of the layer thickness of doubling of the layer thickness along the flood direction (so-called layer thickness wedge) on the plate (flooding area> 2 ⁇ m, dripping area ⁇ 4 ⁇ m, within the specification) stay).
• layer thickness wedge layer thickness wedge
• the coating 40 cm long extruded PC sheets extruded polycarbonate shows (PC) Makrolon ® 3103 plates from (Bayer MaterialScience AG; high-viscosity bisphenol A polycarbonate, MFR 6.5 g / 10 min after ISO 1133 at 300 0 C and 1.2kg, with UV stabilization) and measuring 10 x 40 x 0.4 cm).
• a layer thickness of about 1.3 ⁇ m in the inflow region and about 3.5 ⁇ m in the dripping region was achieved. enough.
• a layer thickness which ensures the minimum UV protection function of the primer is only reached after 10 cm in the direction of flooding on the plate.
• the minimum UV protective function is already reached in the flooding region, so there is no early UV-induced failure of the paint in the flooding region even if the minimum thickness according to the specification of the original SHP 470 is not achieved becomes.
• the commercially available thick primer SHP 470 solids content 9.90% & viscosity 4 mm beaker 46.25 s (for determination see method A & B)) was used. To 100 g of the solution were added 65 g of a 1-to-1 solvent mixture (by weight) of diacetone alcohol and 1-methoxy-2-propanol and 0.49 g of CGL 479. Lacquer solution Example 3A with 5% by weight CGL 479 based on the experimentally determined solids content (determination see method A) was obtained as 5.95%.
• Example 3B to 3D are prepared analogously.
• the weights are listed in Table 4 below:
• the layer thickness was determined by Method C on the coated sample plates,
• the thickness of the transparent two-day coating (Primer 4A, 4B and 4C / Topcoat AS4700) thus obtained was determined by Method C.
• the adhesion of this coating was determined by the following tests a.) Adhesive tape tear ( 3M® 610 adhesive tape used) without and with cross-hatching (analogous to ISO 2409 or ASTM D 3359); b.) Tape tear after 4 h storage in boiling water. Tests a) and b) were passed, ie there was no tearing of the coating (rating 0 according to ISO 2409 or 5B according to ASTM D 3359).

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• 2007
  • 2007-10-20 DE DE102007050192A patent/DE102007050192A1/de not_active Withdrawn
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