Classifications

• • 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
• • 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
  • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
  • B05D1/322—Removable films used as masks
  • B05D1/325—Masking layer made of peelable film
• • 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
  • B05D2451/00—Type of carrier, type of coating (Multilayers)
• • 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
• • 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

Definitions

• the present invention relates to a composite coating formulation suitable for coating of a variety of articles to provide a long term surface protection against adverse environmental impacts and for design purposes.
• the invention further relates to a multilayered film coating comprising a flexible rubber based primary coating layer showing an excellent adherence behavior to the surface to be coated, and a polyurethane based top coating layer having an excellent adherence behavior to the primary coating.
• the multilayer film coating of the invention does not crack or flake and remains securely bonded to an article, but on the other hand can be easily removed without leaving any residue and without damaging the underlying surface.
• the present invention relates to methods for coating articles with the multilayer film coating.
• a wide variety of surface protecting film coatings is formulated and designed having a certain spectrum of desired physicochemical characteristics.
• rubber based coatings e.g. used for designing body components of vehicles, exhibit good flexibility properties and can be removed without using tools or solvent containing means, but are less resistant to adverse environmental conditions like road salt or fuels.
• Multilayered varnish coatings on vehicles provide good toughness and protection properties, however due to their hardness they can be scratched easily. Further, varnish coatings such as metallic paints cannot be removed without using tools or caustic means and therefore cannot be easily replaced by a new coating. Instead, damages like scratches have to be repaired in an expensive manner.
• coatings are desired both having a good flexibility, toughness, adhesion, cohesion and providing chemical resistance to the coated article, and last but not least an aesthetic/desired appearance.
• Adhesive foils are widely used for car styling and labelling purposes. Such foils protect the painted surface of vehicle components against stonechips and are available with a mat or glossy finish. Adhesive foils are useful for coating smaller areas of a car surface. However, coating with foils is difficult in handling if larger surfaces or even the entire outer surface of a car is to be coated. Inaccurate application of large sheets mostly results in the formation of blowholes and detachments on edges and joins of body components. Therefore, after some years of bonding to a varnished/painted surface, removing of the foil is often accompanied with chipping or flaking of the subjacent varnish/paint.
• Rubber based coatings have been shown to possess good adhesion properties when applied to painted body components of vehicles and can be easily removed without impacting the integrity of the subjacent coating. Further, such coatings have a durable and good flexibility which makes them suitable for coating deformable parts of a car such as bumpers or interior panels.
• compositions for car dipping are known in the art and for example disclosed in US4536454 .
• a composite film coating is described consisting of a primary coating and a top coating.
• the top coating contains a thermoplastic rubber. According to the authors of US4536454 , the composite film coating provides good bond strength and forms an air-tight seal over the surface being coated.
• a drawback of the most rubber based coatings is their sensitivity against various hydrocarbon compounds which can be found fuels such as in benzine, diesel or kerosene, e.g. aromatic substances such as benzene and its derivatives.
• a further disadvantageous of many rubber based coatings is their mat finish.
• Various approaches to overcoat the mat rubber coating with a clear coat failed, as the clear coat either did not adhere and/or the resulting composite coating could not be removed anymore without destroying the subjacent coating, as the rubber coating has lost its flexibility properties due to the top clear coat.
• a coating composition which can be easily handled and after being applied, e.g. dipped, onto a surface of an article, e.g. exposed surfaces of a vehicle, forms a coating which combines excellent adhesion, long term flexibility over a large temperature range, easy peelability by hand and insensitivity against organic solvents together with a glossy finish.
• coat formulations described herein are defined, if not otherwise indicated, on the basis of the respective working formulation, i.e. in a state ready for application.
• working formulation further means that the formulation is in the uncured state, preferably in the liquid state.
• the term essentially comprising means that others than the indicated components can be present in the respective formulation. Said other components are present to a minor extent compared to the indicated components, and represent ingredients which are not mandatory to achieve the desired coating characteristics mentioned above.
• the working base coat formulation (P) of the composite coating formulation of the present invention is a rubber based formulation and is preferably a fluid rubber formulation.
• the rubber based formulation comprises:
• the working top coat formulation (S) of the composite coating formulation of the invention comprises or consists of
• the working top coat formulation (S) is applied to the cured surface of the primary coating to form the secondary/top coating layer of the multilayered film coating on the surface to be coated. Due to the excellent adhesion and flexibility properties over a broad temperature range, the top coating does not peel from the base coating layer. Instead, the resulting layers provide a synergistic effect with respect to peel behavior and chemical resistance, particularly when applied to painted surfaces.
• the monomer component of ai) of the rubber based base coat formulation (P) can be any monomer, suitable for forming rubber and is preferably derived from alkenes such as styrene (ethenylbenzene), ethylene, butylene, butadiene, in particular 1,3-butadiene; a C 1-6 (hydroxy)alkyl methacrylate, C 1-6 (hydroxy)alkyl acrylate, e.g. hydroxyethyl acrylate, hydroxypropyl acrylate, acrylonitrile, vinylchlorid and/or vinylacetate.
• alkenes such as styrene (ethenylbenzene), ethylene, butylene, butadiene, in particular 1,3-butadiene
• a C 1-6 (hydroxy)alkyl methacrylate C 1-6 (hydroxy)alkyl acrylate, e.g. hydroxyethyl acrylate, hydroxypropyl acrylate, acryl
• the copolymer component of aii) of the rubber based base coat formulation (P) can be any (block-)copolymer, suitable for forming rubber and is preferably selected from copolymers formed by the monomers indicated for ai), such as a styrene/1,3-butadiene copolymer, a styrene/ethylene/butylene/styrene block copolymer and/or a vinylchloride copolymer.
• a preferred copolymer is a styrene/1,3-butadiene polymer.
• the amount of the monomer component of ai) and/or the copolymer component of aii) in the formulation (P) may vary over a broad range and is usually in the range of 10-80% (w/w), preferably 20-60% (w/w), more preferably 20-40% (w/w), referred to the amount of the formulation (P) being 100% (w/w).
• the at least one organic solvent of aiii) can be selected from a number of organic solvents, preferably non-polar aprotic solvents.
• a suitable solvent/solvent mixture largely depends on the required processing conditions such as curing time, curing temperature, properties of the surface to be coated and the like.
• the at least one organic solvent of aiii) is a non-polar aprotic solvent selected from alkanes, cycloalkanes, aromatic hydrocarbons, carboxylic acid esters, or any combination or mixture thereof.
• the at least one organic solvent of aiii) is C 6-12 alkane, alkylketone, naphtha, benzene, benzene mono- or di-substituted with a C 1-6 alkyl, C 1-6 oxoalkyl and/or aryl, C 1-6 alkyl(glykol)-formiate, C 1-6 alkyl(glykol)-acetate, C 16 alkyl(glykol)-propionate, C 1-6 alkyl(glykol)-butyrate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-formiate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-acetate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-propionate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-butyrate or any mixture thereof.
• the at least one organic solvent of aiii) is heptane, xylene, toluene, methyl ethyl ketone, C 1-3 alkylbenzene, naphtha or any combination or mixture thereof.
• the solvent content preferably the content of the solvent mixture as described above, referred to 100% (w/w) binder containing composition (S1), is between 20-90% (w/w), preferably 30-80% (w/w), more preferably 30-60% (w/w).
• the solvent of aiii) essentially comprises or consists of xylene.
• the solvent of aiii) is a mixture essentially comprising of heptane, xylene, toluene, methyl ethyl ketone, ethyl benzene and naphtha.
• the at least one additive of aiv) can be selected from a wide variety of available substances, depending on the desired application.
• a suitable agent for av) is Titanium oxide, in particular Titanium (IV) oxid (TiO 2 ).
• the at least one pigment of av) can be selected from a wide variety of available substances, depending on the desired application.
• a suitable agent for av) is carbon black.
• the rubber base coat formulation (P) comprises:
• the rubber base coat formulation (P) of said first embodiment comprises:
• Suitable examples for formulations (P) are indicated in tables 1-3: Table 1: Component Content in% (w/w) referred to the base coat formulation (P) Styrene-1 ,3-butadiene copolymer 68 Xylene 32 Table 2: Component Content in% (w/w) referred to the base coat formulation (P) Styrene-1 ,3-butadiene copolymer 30 Xylene 35 TiO 2 35 Table 3: Component Content in% (w/w) referred to the base coat formulation (P) Styrene-1 ,3-butadiene copolymer 23.8-29 Naphtha 33.5-35.6 Xylene 12.5-13.0 Heptane 14.5-15.1 Methyl ethyl ketone 7.5-8.3 Ethyl benzene 3.0-3.2 Carbon black 0-1
• the rubber base coat formulation (P) comprises:
• the rubber base coat formulation (P) of said second embodiment comprises:
• the solvent in said second embodiment is a mixture of xylene and 2-methoxyethanol, wherein the ratio of xylene:2-methoxyethanol is greater than 40:1, preferably greater than 50:1, more preferably 54:1.
• base coat formulations (P) of the present invention are those which are disclosed as base coat formulations in EP0135998A2 . Said base coat formulations are incorporated herein by reference.
• the rubber base coat formulation (P) comprises:
• the rubber based base coat formulation (P) comprises:
• base coat formulations (P) of the present invention are those which are disclosed as base coat formulations in US5192608 . Said formulations are incorporated herein by reference.
• the binder component of b1i) is selected from a polyester polyol, hydroxy-functionalized polyacrylate or mixtures thereof, preferably a polyester polyol.
• a suitable polyester polyol or hydroxy-functionalized polyacrylate has a hydroxyl content of about 2-10%, preferably about 3-8%, more preferably about 3-6% and most preferably about 4-6%.
• a suitable binder component is a polyester polyol with a hydroxyl content of about 5% as manufactured by Synthopol Chemie Dr. Koch GmbH & Co. KG under the trade designation "Synthoester HD-165".
• a further suitable binder component is a polyester polyol with a hydroxyl content of about 3.5% as manufactured by Bayer MaterialScience AG under the trade designation "Desmophen ® 670 BA".
• a polyester polyol or a hydroxy-functionalized polyacrylate having the indicated hydroxyl content provides a top coating layer having both a durable low-temperature flexibility and weather resistance. According to the area of application, flexibility characteristics can be further adapted by altering the amount of the polyol as well as the amount and/or kind of the curing agent as described below.
• the content of the binder component b1i) in the composition (S1) is between 20-80% (w/w), 30-70% (w/w), preferably 30-60% (w/w), more preferably 40-60% (w/w) and most preferably between 43-53% (w/w), referred to 100% (w/w) binder containing composition (S1).
• an amount of 40-80% (w/w), more preferably 50-70% (w/w), most preferably 55-65% of a polyester polyol containing composition as manufactured by Synthopol Chemie Dr. Koch GmbH & Co. KG under the trade designation "Synthoester HD-165" is used, having a solid content of 80% (w/w).
• the at least one organic solvent of b1ii) can be selected from a number of organic solvents, preferably non-polar aprotic solvents.
• a suitable solvent/solvent mixture largely depends on the required processing conditions such as curing time, curing temperature, properties of the surface to be coated and the like.
• the at least one organic solvent of b1ii) is a non-polar aprotic solvent selected from alkanes, cycloalkanes, aromatic hydrocarbons, carboxylic acid esters, or any combination or mixture thereof.
• the at least one organic solvent of b1ii) is benzene, benzene mono- or di-substituted with a C 1-6 alkyl, C 1-6 oxoalkyl and/or aryl, C 1-6 alkyl(glykol)-formiate, C 1-6 alkyl(glykol)-acetate, C 1-6 alkyl(glykol)-propionate, C 16 alkyl(glykol)-butyrate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-formiate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-acetate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-propionate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-butyrate or any mixture thereof.
• the at least one organic solvent of b1ii) is xylene, toluene, butyl acetate, propyl acetate, methoxypropyl acetate, butylglykol acetate or any combination or mixture thereof.
• the solvent content preferably the content of the solvent mixture as described above, referred to 100% (w/w) binder containing composition (S1), is between 20-80% (w/w), 30-70% (w/w), preferably 30-60% (w/w), more preferably 40-60% (w/w) and most preferably between 46-56% (w/w).
• the solvent of b1ii) is a mixture essentially comprising of xylene, toluene, butyl acetate, propyl acetate, methoxypropyl acetate and butylglykol acetate, wherein the content of the solvents, referred to 100% (w/w) binder containing composition (S1), is as follows:
• the solvent content, referred to 100% (w/w) binder containing composition (S1), is 40-60% (w/w), preferably 46-56% (w/w).
• the at least one light-stabilizing/light-protecting/light-absorbing agent of b1iii) of the binder containing composition (S1) can be selected from a wide variety of compounds according to the desired purpose.
• UV-light absorbers are used to prevent the UV sensitive substances such as color pigments from degeneration.
• a preferred UV-light absorber is a compound selected from the hydroxyphenylbenzotriazole class such as 2-(2H-benzotriazol-2-yl)-4,6-diterpentylphenol as for example manufactured by BASF SE under the trade designation "TINUVIN ® ".
• the amount of at least one light- stabilizing/light-protecting/light-absorbing agent of b1 iii) in the composition can vary according to the field of application. Coatings of the invention adapted for surfaces which are not exposed to sun light, e.g. electric cable or communication cable surfaces do not need to contain a light protection.
• an UV absorbing agent e.g. selected from a hydroxyphenyl benzotriazole, e.g. as described above, is between 0-2% (w/w), preferably 0.1-1% (w/w), referred to 100% (w/w) binder containing composition (S1).
• the UV absorbing agent is 2-(2H-benzotriazol-2-yl)-4,6-diterpentylphenol as for example manufactured by BASF SE under the trade designation "TINUVIN ® " in an amount of 0.2-0.4% (w/w).
• the at least one additive of b1 iv) of the binder containing composition (S1) facilitates the processing, i.e. the application of the working top coat formulation (S) e.g. by reducing air bubbles and foaming, and improving flowability of the formulation on the surface to be coated, in particular when applied to the dried/cured primary coating by spray application or brush application techniques.
• the at least one additive of b1iv) is a silicone glycol containing compound such as a silicone glycol having a carbinol functionality and/or a poly-diC 1-6 alkylsiloxan compound optionally modified with a polyester and/or a polyether. More preferably, the at least one additive of b1iv) is a mixture of a silicone glycol having a carbinol functionality and a polyether modified poly-diC 1-6 alkylsiloxan such as polyether modified poly-dimethylsiloxan.
• the silicone based additives reduce the surface tension and prevents Bénard cell formation while increasing the surface smoothness, and improves the glossiness of the resulting top coating. It confers the working formulation good leveling properties and the resulting coating good slip and mar-resistance properties.
• a suitable polyether modified poly-diC 1-6 alkylsiloxan is a polyether modified poly-dimethylsiloxan containing composition as for example manufactured by BYK-Chemie GmbH under the trade designation "BYK-331".
• a suitable silicone glycol having a carbinol functionality can be obtained by Dow Corning Corporation under the trade designation "Dow Corning ® 11".
• the amount of the at least one additive of b1iv) as described above, referred to 100% (w/w) binder containing composition (S1), is between 0-2% (w/w), 0.01-1% (w/w), 0.01-0.3% (w/w), 0.05-0.25% (w/w), preferably 0.05-0.2% (w/w), more preferably 0.1-0.15% (w/w).
• the additive of b1 iv) is a mixture of a silicone glycol having a carbinol functionality, e.g. as obtained by Dow Corning Corporation under the trade designation "Dow Corning ® 11 ", and a polyether modified poly-dimethylsiloxan, e.g.
• the amount of the polyether modified poly-dimethylsiloxan, referred to 100% (w/w) binder containing composition (S1), is between 0.01-0.2% (w/w), 0.05-0.2% (w/w), preferably 0.01-0.1% (w/w), more preferably 0.04-0.08% (w/w), and the amount of the silicone glycol having a carbinol functionality, referred to 100% (w/w) binder containing composition (S1), is between 0.01-0.2% (w/w), 0.05-0.2% (w/w), preferably 0.01-0.1% (w/w), more preferably 0.05-0.09% (w/w), and wherein the amount of both additives together, referred to 100% (w/w) binder containing composition (S1), is between 0.02-0.3% (w/w), 0.05-0.25% (w/w), preferably 0.05-0.2% (w/w), more preferably
• the amount of the polyether modified poly-dimethylsiloxan, referred to 100% (w/w) binder containing composition (S1), is between 0.04-0.08% (w/w), and the amount of the silicone glycol having a carbinol functionality, referred to 100% (w/w) binder containing composition (S1), is between 0.05-0.09% (w/w), wherein the amount of both additives together, referred to 100% (w/w) binder containing composition (S1), is between 0.1-0.15% (w/w).
• the at least one agent of b1v) of the binder containing composition (S1), capable of catalyzing a polymerisation reaction of the binder component of b1 i) as described above, with an isocyanate group containing compound can be selected from an C 1-6 alkyltin, diC 1-6 alkyltin such as a dibutyltin, and/or a derivate thereof, or any mixture thereof.
• a suitable agent of b1v) is a mixture of butyltin derived compounds as can be obtained by Rohm and Haas under the trade designation "MetatinTM Katalysator 712 ES”.
• the agent of b1v) can be further selected from tin-free metal carboxylate compounds as manufacture by OMG Borchers GmbH under the trade designation "Borchi ® Kat”.
• the amount of the agent of b1v) can vary over a broad range, depending on the amount of binder and the field of application.
• the amount of the agent of b1v), referred to 100% (w/w) binder containing composition (S1) is between 0-2% (w/w), 0.01-1% (w/w), preferably 0.01-0.1% (w/w), more preferably 0.02-0.06% (w/w).
• the binder containing composition (S1) comprises, essentially comprises or consists of
• the amount of the binder component of b1i) is 43-53% (w/w) and/or the amount of the solvent is 46-56% (w/w), each referred to the amount of the binder containing composition (S1) being 100% (w/w).
• the binder containing composition (S1) according to the present invention comprises, essentially comprises or consists of
• the amount of the binder component of b1 i) is 43-53% (w/w) and/or the amount of the solvent of b1 ii) is 46-56% (w/w), and/or the amount of the additive of b1iv) is 0.02-0.3% (w/w), each referred to the amount of the binder containing composition (S1) being 100% (w/w).
• the binder containing composition (S1) according to the present invention comprises, essentially comprises or consists of
• the amount of the binder component of b1i) is 43-53% (w/w) and/or the amount of the solvent of b1ii) is 46-56% (w/w), and/or the amount of the additive of b1iv) is 0.1-0.15% (w/w), each referred to the amount of the binder containing composition (S1) being 100% (w/w).
• the amount of the polyether modified poly-dimethylsiloxan, referred to 100% (w/w) binder containing composition (S1), is between 0.04-0.08% (w/w), and the amount of the silicone glycol having a carbinol functionality, referred to 100% (w/w) binder containing composition (S1), is between 0.05-0.09% (w/w), wherein the amount of both additives together, referred to 100% (w/w) binder containing composition (S1), is between 0.1-0.15% (w/w).
• the binder containing composition (S1) according to the present invention comprises or essentially comprises:
• the content of the solvents of the solvent mixture of b1ii), referred to 100% (w/w) binder containing composition (S1) is as follows:
• the binder containing composition (S1) further comprises b1iv) 0.02-0.3% (w/w), preferably 0.05-0.25% (w/w), more preferably 0.05-0.2% (w/w), most preferably 0.1-0.15% (w/w) of a mixture of a silicone glycol having a carbinol functionality, e.g. as obtained by Dow Corning Corporation under the trade designation "Dow Corning ® 11", and a polyether modified poly-dimethylsiloxan, e.g. as obtained by BYK-Chemie GmbH under the trade designation "BYK-331",
• the binder containing composition (S1) further comprises b1iv) 0.04-0.08% (w/w) of the polyether modified poly-dimethylsiloxan e.g. as obtained by BYK-Chemie GmbH under the trade designation "BYK-331", and 0.05-0.09% (w/w) of the silicone glycol having a carbinol functionality, e.g.
• the top coat formulation (S) is a multi-component, preferably a two-component lacquer/coating formulation further comprising
• the curing agent of b2i) is preferably selected form a curing agent having at least two (blocked) isocyanate groups, wherein a suitable curing agent is selected from a di-, tri-, tetra-, penta-, hexa-, hepta-, octa-, nona- or decamethylene diisocyanate, toluene-2,4-diisocyanate, diphenylmethane diisocyanate, methylenediphenyl diisocyanate, polymerized diphenylmethane diisocyanate, isophorone diisocyanate, 4,4'-diisocyanato dicyclohexylmethane or a prepolymer derived from said diisocyanate compounds, or any mixture thereof, wherein the aliphatic diisocyanate compounds are especially preferred in formulations applied for the coating of weather exposed surfaces.
• the curing agent contains an isocyanate group containing prepolymer, e.g. as obtainable by BASF AG under the trade designation Basonat ® HB 275 B.
• the at least one organic solvent of b2ii) can be selected from a wide number of non-polar aprotic solvents, e.g. solvents selected from aromatic hydrocarbons, carboxylic acid esters, or any mixture thereof.
• the at least one organic solvent of b2ii) is benzene, benzene mono- or di-substituted with a C 1-6 alkyl, C 1-6 oxoalkyl and/or aryl, C 16 alkyl(glykol)-formiate, C 1-6 alkyl(glykol)-acetate, C 1-6 alkyl(glykol)-propionate, C 16 alkyl(glykol)-butyrate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-formiate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-acetate, C 1-6 alkoxy-C 1-6 alkyl(glykol)-propionate, C 1-6 al
• Xylene, toluene, Butyl acetate, butyl acetate, propyl acetate, methoxypropyl acetate, butylglykol acetate or any mixture thereof is preferred. More preferred is a mixture of Butyl acetate and methoxypropyl acetate.
• the content of the curing agent component b2i) may vary depending on the intended application and is between 5-80% (w/w), 10-70% (w/w), preferably 20-60% (w/w), more preferably 40-60% (w/w), most preferably 48-52% (w/w), referred to 100% (w/w) of the curing agent containing composition (S2).
• the working top coat formulation (S) is obtained by mixing compositions (S1) and (S2) immediately before application.
• the mixing ratio is selected to achieve a degree of cross linking of the binder component b1 i) is between 60-200%, 80-200%, preferably 90-200%, more preferably 100%-200%, most preferably 100%-160%%, especially 100%-120%.
• This can be achieved by mixing both compositions together, wherein the volume ratio of S1:S2 is up to 20:1, e.g. between 20:1 to 1:20, 20:1 to 1:2 or 1:1, 10:1 to 1:10, 10:1 to 1:2 or 1:1, 4:1 to 1:4, 4:1 to 1:2, preferably 4:1 to 1:1, more preferably 3:1 to 1:1, most preferably 2:1.
• a preferred two-component top coat working formulation (S) ready for application contains or consists of
• a preferred composite coating formulation of the invention comprises or consists of the following formulations:
• the combination of a base coat formulation (P) as described above as the first embodiment of the coating formulation (P), in particular as defined in Tables 1-3 herein, and a two-component top coat formulation (S) containing a binder containing composition (S1) as described above as the third or fourth embodiment of the compositions S1 including their aspects, is especially preferred.
• a top coat formulation (S) as defined above can be used to form a top coating with a glossy finish.
• the top coat formulation (S) does not contain a coloring agent/pigment, allowing the formation of a transparent coat having only limited opacity.
• a further aspect of the present invention is a composite coating formulation comprising, essentially comprising of consisting of
• the working color coat formulation (I) can be selected from a wide variety of pigmented lacquer/varnish formulations.
• a suitable color coat formulation (I) is a pigmented lacquer/varnish composition used for forming a base coat in car industry.
• a suitable color coat formulation (I) is a pigmented alkyd resin containing or a nitro pyroxylin containing lacquer/varnish composition.
• a composite coating formulation of the invention comprising or consisting of a base coat formulation (P), a top coat formulation (S) and a color coat formulation (I), is suitable for providing a tri-layered film coating, wherein, if the working formulations are applied in the sequence (P), (I), (S), the primary coating/layer directly adheres to the surface to be coated, the intermediate coating/layer directly adheres to the first coating/layer, and the secondary coating/layer directly adheres to the intermediate coating/layer.
• a composite coating formulation of the invention comprising or consisting of a base coat formulation (P), a top coat formulation (S) and a color coat formulation (I)
• the color coat formulation (I) may contain color pigments
• the base coat formulation (P) and the top coat formulation (S) are preferably free of pigments.
• the working formulations (P) and (S) need not be adapted for each desired color; instead the working formulations (P) and (S) respectively each can be identical in applications in which different colors/color effects are provided.
• a further aspect of the present invention is a coating formulation (S) for forming a coating, preferably a top coating on a surface of an article, the coating formulation (S) contains or consists of
• the formulation (S) optionally further contains rust-inhibiting agents.
• the coating formulation (S) of the invention is suitable for providing a large number of different articles/surfaces with a flexible, glossy coating and an air-tight seal, including articles/surfaces which are plastically and/or elastically deformable.
• the working/uncured coating formulation (S) of the present invention is reasonably viscous and highly adherent to a surface upon which it is applied, properties which it retains while in the liquid state.
• the working/uncured coating formulation (S) of the present invention is highly adherent to the dried/cured base coating formulation (P) as herein described.
• the said coating formulation (S) cures uniformly on a variety of surfaces and in particular on a primary coating layer as obtained by or obtainable by applying the base coat formulation (P) as herein described. Further, a coating using the formulation (S) is created without premature surface curing or skinning which would otherwise impede the loss of excess solvent from an uncured core.
• the coating formulation (S) has good filling characteristics. Therefore the coating formulation (S) can be used to repair smaller surface defects such as defects in paint work, e.g. on vehicle components. Further, the coating formulation (S) can be used to provide surfaces with a glossy finish. Therefore, the invention further relates to a method of providing a glossy finish/clear coat on a surface of an article, preferably on a mat surface, e.g. a surface coated with a rubber coat such as a primary coating as described herein. The process comprises the step of applying the working formulation (S) to the surface to be coated and allowing the formation of the coating, e.g. by drying/curing under ambient conditions.
• the coating formulation (S) provides a coating with high toughness and resistance against various chemical and mechanical impacts.
• the invention further relates to a method to protect a surface of an article, preferably a metallic surface, a painted surface, a chromed surface or a surface coated with a rubber coat such as a primary coating as described herein against chemical destruction and/or mechanical destruction.
• the process comprises the step of applying the working formulation (S) as defined above to the surface to be coated and allowing the formation of the coating, e.g. by drying/curing under ambient conditions.
• the present invention further relates to a method for preparing a multilayered, preferably an at least two-layered film coating on a surface of an article, wherein the composite coating formulation as described above is used, comprising the base coat formulation (P) for forming the primary coating and the top coat formulation (S) for forming the secondary coating.
• the method comprises the following steps:
• the present invention further relates to a method for preparing a multilayered, preferably an at least tri-layered film coating on a surface of an article, wherein the composite coating formulation as described above is used, comprising the base coat formulation (P) for forming the primary coating, the top coat formulation (S) for forming the secondary coating, and the color coat formulation (I) for forming the intermediate coating.
• the method comprises the following steps:
• the method of the invention also considers embodiments wherein the method steps which provide the primary coating (steps (i) and (ii)) are performed at least two times before performing step (iii).
• This has the advantage, that a relatively thick base coating can be obtained, which is for example desired in applications where a filling and levelling of irregularities/unevenness like scratches on a surface, e.g. a painted surface to be coated is required.
• the method of the invention also considers embodiments wherein the method steps which provide the secondary coating (steps (iii) and (iv), or (v) and (vi) respectively) are performed at least two times in order to obtain a relatively thick top coating layer.
• This allows the formation of glossy coating showing a strong resistance behavior against mechanical stresses, e.g. abrasive impacts when polishing the coated surface and chemical stresses, e.g. when contacted with fuels and lubricants.
• the method of the invention also considers embodiments wherein the method steps which provide the intermediate coating (steps (iii) and (iv) of the method for preparing an at least tri-layered film coating) are performed at least two times before performing step (v) in order to obtain a relatively thick color coating. This allows the formation of colored surfaces with any desired color effects.
• the method steps (ii) and (iv), or (ii), (iv) and (vi) respectively, relate to the film forming reaction steps after the respective working coat formulation has been applied.
• Said film forming reaction steps include the exposure of the applied formulation to conditions which allow drying, i.e. evaporating the solvents contained in the applied formulation, and/or curing, i.e. formation of cross linked binder polymers.
• said steps are performed under ambient conditions.
• said steps can be performed at a temperature between 30-100°C, preferably between 40-80°C.
• the method steps (i) and (iii), or (i), (iii) and (v) respectively, relate to the application of the working coat formulation.
• Said applications steps can be performed by a variety of methods known in the art.
• the application steps are performed by dipping, e.g. single or multiple dipping operations, spray application, brush application and/or roller application.
• the method of the invention provides a multilayered film coating exhibiting a unique property profile, which is desired in a wide variety of coating applications, especially for car styling and paint-repair purposes.
• the method of the invention can be applied inter alia to provide an article with a new styling, to provide resistance to a surface of an article against adverse environmental impacts and to repair defects on a surface, e.g. defects in paint work.
• the invention also relates to methods for providing to a surface of an article, preferably a metallic surface or a painted surface,
• the present invention further relates to a multilayered film coating obtained by or obtainable by a method as described above using the composite coating formulation of the invention as described above.
• the multilayered film coating includes a primary film coating and a secondary/top film coating.
• the multilayered film coating optionally further includes an intermediate film coating, which is arranged between the primary film coating and the secondary/top film, and preferably provides the coloring layer.
• the primary film coating directly adheres to the surface to be coated.
• the intermediate film coating directly adheres to the primary film coating.
• the secondary/top film coating directly adheres to the primary film coating if no intermediate layer is present, or to the intermediate film layer.
• the multilayered film coating of the invention is obtained by or obtainable by a method as described above using the composite coating formulation of the invention which comprises or consists of the following formulations:
• the multilayered film coating of the invention as described above possesses an outstanding property profile.
• the primary rubber based coating of the multilayered film coating of the invention which is directly adhered to the surface shows on a wide variety of surfaces, a durable, in particular edge durable, adherence and is pliable and flexible over a wide temperature range, such as a temperature range, a vehicle, including cars, airplanes, boats and the like, is subjected to.
• the primary coating film possesses sufficiently high cohesive strength so as to render the dried film extremely tough and durable, and with sufficiently high adhesive strength so as to render the coating resistant to premature failure or release.
• the secondary/top coating of the multilayered film coating of the invention is directly and firmly bonded to the cured/formed primary coating layer. Due to the uniformly curing/drying of the previously applied top coat formulation (S) as described herein, no bubble formation occurs between the top coat layer and the subjacent primary coating or intermediate coating. Instead, the top coating layer provides the primary coating with slip and toughness properties. It is not possible to separate the top coating layer from the subjacent primary coat or intermediate coat by peeling or skimming. Due to its outstanding cohesive strength, the top coating layer also enhances the weatherproofness of the overall coating as well as that of the coated article. The secondary/top coating layer does not impair the pliability and flexibility characteristics of the primary coating and does not decrease its adhesive/peel strength.
• the flexibility of the primary coating does not impair the toughness, glossy finish and the high peel strength of the top coating layer. Instead, it could be observed that each of the layers in the multilayered film coating of the invention retains its good physical properties. Moreover, when applied to a painted/varnished surface of a vehicle component, the adherence of the primary coating to the coated surface is even improved if the primary coating layer itself is coated with the top coating formulation. Thus, with respect to the desired characteristics of the single coating layers, the combination of the primary coating and the secondary coating does not only lead to an addition of the respective properties; instead the combination of the coatings in the multilayered film coating of the invention generates a synergistic effect.
• the multilayered film coating of the invention, or the composite coating formulation, respectively is suitable to coat plastically or elastically deformable surfaces.
• the multilayered film coating of the invention is further characterized in that it is peelable by hand wherein integrity of the film coating layers to each other is not destroyed when peeled off by hand under ambient conditions.
• removing the multilayered film coating of the invention by hand does not result in the formation of small pieces of removed coating material.
• coating sheets can be obtained, having a size of 0.1 square meter or more, preferably 1 square meter or more, more preferably 2 square meter or more, if the multilayered film coating of the invention is peeled by hand under ambient conditions from a variety of surfaces, in particular painted surfaces of vehicle components. Even for a layperson it is easy to peel of the film by hand getting film sheets of even more than 2, 3 or 4 square meter. If removed from the surface, the layers of the multilayered film coating of the invention do not separate from each other, i.e. the layers remain attached to each other during peeling.
• the multilayered film coating of the invention can be removed by peeling without damaging the underlined surface structure, e.g. an original lacquer/finish/paint.
• the present invention further relates to a peelable multilayered surface coating obtained by or obtainable by a method as defined above, the coating having a property profile as described above.
• the present invention further relates to an article coated with the composite coating formulation according to a method as described herein or with the coating formulation (S) each of which is as defined herein.
• the present invention further relates to an article having a surface coat containing or consisting of a multilayered film coating, wherein the film coating is obtained by or obtainable by a method as described herein
• the composite coating formulation forms a multilayered film coating with good adherence properties on a wide variety of different surfaces.
• the article or the surface to be coated is a painted/varnished or unpainted/unvarnished metal, a metal alloy and/or a plastic article/surface.
• a preferred article in connection with the present invention is a body component of a vehicle, preferably a painted or chrome plated component of a vehicle, e.g. of a motorized vehicle such as a car, a watercraft, an aircraft or a motorbike.
• a further preferred article in connection with the present invention is selected from an electric cable, a communication cable, a rubber hose or a tool handle.
• a further preferred article in connection with the present invention is selected from furniture, sporting goods such as surfboards and car interior components.
• a further preferred article in connection with the present invention is selected from swimming pool articles, window frames, front doors and garage doors.
• a further preferred article in connection with the present invention is selected from pipelines, e.g. oil pipelines.
• the invention further relates to a container such as an aerosol can, containing a binder containing composition (S1) and a optionally a curing agent containing composition (S2) of the working top coat formulation (S) of the invention, wherein the composition (S1) is separated from composition (S2).
• a container such as an aerosol can, containing a binder containing composition (S1) and a optionally a curing agent containing composition (S2) of the working top coat formulation (S) of the invention, wherein the composition (S1) is separated from composition (S2).
• a working top coat formulation (S) of the composite coating formulation of the invention is prepared as follows:
• composition (S2) 66.7g of a 75% solution of an isocyanate group containing prepolymer in butyl acetate, obtainable by BASF AG under the trade designation Basonat ® HB 275 B", is mixed at room temperature with 8.3g butyl acetate and 25g methoxypropyl acetate.
• composition (S1) is mixed with 50g of composition (S2) to give 150g of the working top coat formulation (S).
• a base coat formulation (P) as defined in anyone of the Tables 1-3 herein is applied, e.g. by spraying or dipping to a surface to be coated.
• the base coat formulation is allowed to dry at a temperature between 10-80°C for 10min-72hours until the applied formulation is hardened thereby obtaining the primary coating.
• a top coat formulation (S) as prepared in Example 1 herein is applied to the primary coating, e.g. by spraying or dipping.
• the top coat formulation is allowed to cure at a temperature between 10-80°C for 10min-72hours until the applied formulation is hardened thereby obtaining the secondary coating.

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Paints Or Removers (AREA)
• Laminated Bodies (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

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• 2014
  • 2014-03-07 EP EP14158451.6A patent/EP2905085A1/fr not_active Withdrawn
• 2015
  • 2015-02-06 WO PCT/EP2015/052494 patent/WO2015118098A2/fr active Application Filing
  • 2015-02-06 EP EP15705542.7A patent/EP3102341A2/fr not_active Withdrawn

Patent Citations (7)

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