US20190136095A1 - Paint Film Appliques with Reduced Defects, Articles, and Methods - Google Patents

Paint Film Appliques with Reduced Defects, Articles, and Methods Download PDF

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Publication number
US20190136095A1
US20190136095A1 US16/301,713 US201716301713A US2019136095A1 US 20190136095 A1 US20190136095 A1 US 20190136095A1 US 201716301713 A US201716301713 A US 201716301713A US 2019136095 A1 US2019136095 A1 US 2019136095A1
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United States
Prior art keywords
layer
paint film
applique
film applique
paint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/301,713
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English (en)
Inventor
James E. McGuire, Jr.
Andrew C. Strange
Matthew J. Canan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Entrotech Inc
Original Assignee
Aero Advanced Paint Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/US2017/021982 external-priority patent/WO2017156507A1/en
Application filed by Aero Advanced Paint Technology Inc filed Critical Aero Advanced Paint Technology Inc
Priority to US16/301,713 priority Critical patent/US20190136095A1/en
Assigned to AERO ADVANCED PAINT TECHNOLOGY, INC. reassignment AERO ADVANCED PAINT TECHNOLOGY, INC. NUNC PRO TUNC ASSIGNMENT (SEE DOCUMENT FOR DETAILS). Assignors: MCGUIRE, JAMES E., JR., STRANGE, ANDREW C., CANAN, MATTHEW J.
Publication of US20190136095A1 publication Critical patent/US20190136095A1/en
Assigned to ENTROTECH, INC. reassignment ENTROTECH, INC. NUNC PRO TUNC ASSIGNMENT (SEE DOCUMENT FOR DETAILS). Assignors: AERO ADVANCED PAINT TECHNOLOGY, INC.
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane
    • C09J2475/001—Presence of polyurethane in the barrier layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane
    • C09J2475/006—Presence of polyurethane in the substrate

Definitions

  • the present invention relates generally to paint film appliques with reduced defects, methods of making and using the same, and articles comprising the same.
  • Painted surfaces are commonly used in many different types of applications. Painted surfaces can not only improve aesthetic properties of a surface, but they can also improve functional properties of underlying surfaces and help protect the same.
  • One such application is in the transportation industry, where exterior painted surfaces are typically exposed to a variety of environments, some of which can be very harsh on the surface. Examples of articles in the transportation industry having such painted surfaces include vehicles providing transportation over land, in the water, and in the air. Such vehicles include aircraft and motorized vehicles like automobiles and trucks. The paint on such surfaces can function to protect the underlying surface from damage due to that exposure. However, the paint itself must also be durable to withstand repeated exposure to such damaging environments.
  • VOC emission reduction and water conservation, both associated with conventional painting processes, are therefore increasingly important environmental considerations.
  • additional weight leads to consumption of excess fuel and restrictions on the number of passengers or amount of cargo that an associated vehicle can safely and efficiently transport.
  • a unique consideration associated with painting or otherwise covering exterior surfaces on aircraft and similar vehicles is the impact of the relatively high vehicle speeds on the surface of the vehicle and any coatings or coverings thereon.
  • wind resistance associated with travel at high speeds can make it difficult to retain uniform and adequate adherence of such coatings or coverings on a vehicle's surface.
  • coatings and coverings developed for application to exterior surfaces of vehicles traveling on, for example, land-based highways are often not adequate to withstand the challenging conditions associated with higher speeds of travel through air or on land-based raceways.
  • paint replacement film or sheet also referred to as an applique
  • 3M Company of St. Paul, Minn. markets paint replacement films and tapes for certain such applications.
  • 3MTM Paint Replacement Film F577 is described as a polyvinyl chloride film providing a textured black matte appearance for use on vehicle window frames, window sashes, window extensions, body and door pillars, dashboard components and lids (metal or plastic).
  • Such film is described as providing a high-gloss (90% reflectivity) black appearance and an outer clearcoat that can be integrated into vehicle designs. See also U.S. Patent Publication No. 2007/0047099; U.S. Pat. No. 5,965,256; U.S. Pat. No. 6,475,616; and U.S. Pat. No. 7,141,303, all of which are assigned to 3M Innovative Properties Company.
  • U.S. Pat. No. 5,034,275 refers to a paint-coated sheet material.
  • the material purportedly comprises a flexible and stretchable thermoplastic polyester carrier film, a stretchable aqueous polyurethane paint layer, a stretchable transparent crosslinked polyurethane topcoat layer and, disposed between the carrier film and the paint layer, a thin tie layer formed by coating an aqueous dispersion of a neutralized copolymer of ethylene and an ethylenically unsaturated carboxylic acid on the carrier film.
  • U.S. Pat. No. 5,114,789 describes a decorative sheet material having a transparent topcoat that can be bonded to various substrates, such as exterior automotive panels, as a protective and decorative coating.
  • the sheet material comprises a thin carrier film, a paint layer adhered to one surface of the carrier film, and a crosslinked topcoat layer. That topcoat layer is stated to be “extremely thick”—at least 0.1 millimeter (100 microns)—in embodiments described therein.
  • U.S. Pat. No. 5,242,751 describes a paint composite article including a thermally deformable carrier film having, on its first major surface, an adhesive layer and, on its second major surface, a paint layer consisting of a pigmented basecoat covered by a polyurethane topcoat layer.
  • U.S. Pat. No. 5,268,215 describes a paint-coated film purportedly having good mar resistance.
  • a polyurethane paint layer is coated on a polymeric carrier film.
  • Coated on the upper surface of the paint layer is a polyurethane clearcoat layer, which is then coated with a polyurethane-siloxane topcoat layer.
  • the film can purportedly be thermoformed, stretched, and bonded adhesively to auto body parts, boats, household appliances, and other substrates as protective and decorative coverings having a basecoat-clearcoat appearance.
  • U.S. Pat. No. 5,468,532 describes a multi-layer graphic article with a color layer. It is based on a polymeric film that is covered with a protective surface layer to purportedly make the article weatherable and resistant to chemical exposure.
  • the protective surface layer is described as being a polyurethane-based material in an exemplary embodiment.
  • U.S. Pat. No. 6,132,864 describes a painted plastic film coated with two or more coats of certain materials. It consists of a base plastic film, which is first coated with a filler composition, followed by coating with a pigmented paint, and then coating with a transparent plastic film.
  • the base plastic film can be a polyolefin, a polyamide, a polyurethane, a polyester, a polyacrylate, a polycarbonate or mixture of different polymeric substances.
  • the filler composition is described as a composition containing a binder and crosslinking agent among other components.
  • the pigmented paint coating is described as a topcoat comprising a polymeric binder, with or without a crosslinking agent, and a pigment or mixture of pigments.
  • the transparent plastic film is described as being one of the same materials suitable for use as the base film.
  • the multi-layer sheets described therein purportedly have good resistance to stone chipping and corrosion.
  • paint replacement films present on a surface must first be removed when refinishing the surface.
  • Many conventional films, however, are not easily removable as the layers therein are prone to delamination. Delamination of the paint replacement film when removing the same from a surface can significantly complicate the refinishing process.
  • some polymer chemistries are not capable of being hot-melt processed due to their relatively high molecular weight and/or the presence of crosslinking, both of which can make it difficult, if not impossible, to hot-melt process preformed pellets of the compositions (as is done generally according to conventional methods of forming polymer films using hot-melt processing) at a temperature below the degradation temperature of the polymer composition or substrate onto which the film is formed.
  • wet casting polymer film formation methods also have their disadvantages. Whether the system is solventborne or waterborne, it must first be coated onto a desired substrate and then dried to remove solvating or dispersing medium (i.e., organic solvent or water, respectively) in order to form a polymer film. Thus, formation of polymer films of sufficient thickness can be problematic using wet casting methods. In addition, some polymer chemistries are not capable of being formed into polymer films using wet casting methods due to the lack of adequate solubility of such polymers or their constituents in conventional solvents and dispersing mediums.
  • solvating or dispersing medium i.e., organic solvent or water, respectively
  • conventionally manufactured polymer films are limited to those particular polymer chemistries that can be formed into films using conventional methodology, again which methodology typically involves extrusion and other methods for formation of a film from an already polymerized composition. Due to the methodology by which they are formed as well as methodology by which they are laminated to adjacent films, conventionally manufactured polymer films typically suffer from defects arising from at least one of gelation, die lines, and gauge lines. Due to their negative impact on, for example, visual properties of the final product, the prevalence of defects necessitates exhaustive testing and analysis of polymer film formed to ensure suitability of that polymer film for the intended application.
  • Gelation results in the presence of gel particles (also referred to as “gel”) in the final product.
  • a “gel” is generally understood to be a viscous composition, which in polymer processing can be, for example, an at least partially polymerized composition, one having a relatively high molecular weight, and/or one containing significant amounts of entrapped gas (e.g., air or reaction by-products, such as carbon dioxide). Gels may manifest themselves in various forms and often result from overheating during processing of polymerized compositions into polymer films.
  • entrapped gas e.g., air or reaction by-products, such as carbon dioxide
  • gels may take a crosslinked form, result from catalyst or other organic or inorganic residue in stagnating and/or dead regions of resins during extrusion, result from degraded oxidation-related occurrences (e.g., carbon dioxide bubbles resulting from moisture), or have their roots in the supply chain. Gelation can make formation of uniform layers of polymeric material (e.g., films) difficult.
  • defects can lead to aesthetic imperfections, weak points and rupturing in polymer films and paint film appliques and generally compromise their suitability for many applications. As such, exhaustive efforts are conducted throughout the supply chain to determine the presence and extent of defects. Many defects are readily detectable when viewed with an unaided human eye. Other methods for detection of defects can also be used, including spectroscopy. When detected, defect-laden polymer film must often be scrapped, leading to considerable waste.
  • a colored, in-situ polymerized polymer film facilitates improved paint film appliques.
  • a paint film applique comprises a defect-free, colored polymer film as a carrier layer.
  • paint film appliques of the invention do not rely on such a layer as the carrier layer, the result being an improvement in one or more desired properties in addition to the processing efficiencies imparted thereby.
  • Defect-free, colored polymer films useful as the carrier layer in paint film appliques of the invention are generally described in co-pending PCT Patent Application No. PCT/US17/21982, entitled “Defect-Free Polymer Films and Related Protective Sheets, Articles, and Methods,” which application is incorporated by reference herein in its entirety.
  • protective sheets including components influencing their color and/or transparency are referenced therein, it is also described therein that it is preferable that the sheets have smooth, glossy surfaces and a substantially uniform thickness throughout in order to maximize their capability of providing seemingly invisible protection to a surface.
  • polymer films formed according to the disclosure therein are colored in order to find use in paint film appliques comprising the polymer film.
  • FIG. 1 is a graph of Loss Factor (also referred to as Tan Delta) versus Temperature for in-situ polymerized polyurethane carrier layers that can be colored to find use in paint film appliques of the invention as compared to those properties associated with conventionally formed polyurethane carrier layers.
  • Loss Factor also referred to as Tan Delta
  • FIG. 2 is a graph of Storage Modulus versus Temperature for in-situ polymerized polyurethane carrier layers that can be colored to find use in paint film appliques of the invention as compared to those properties associated with conventionally formed polyurethane carrier layers.
  • paint film applique encompasses films including essentially one uniform color throughout as well as films which, by themselves or in combination with other paint replacement films, include graphics, patterns, and other non-uniformly dispersed color variations throughout.
  • Paint film appliques of the invention generally comprise a colored, in-situ polymerized polymer layer. While other color layers may be present, benefits are maximized by use of the colored, in-situ polymerized polymer layer as the carrier layer in paint film appliques.
  • paint film appliques comprise an adhesive layer.
  • the colored, in-situ polymerized polymer layer comprises at least one color-inducing component and provides the primary uniform or non-uniform color throughout the paint film applique. When the color-inducing component is a pigment, the colored, in-situ polymerized polymer layer is also referred to in describing exemplary embodiments of the invention herein as a “pigmented layer.”
  • Paint film appliques of the invention are advantageously not only capable of covering a surface with improved properties, but also capable of being more cleanly removed therefrom than conventional paint film appliques including conventionally formed carrier layers. It has been found that adhesive residue remaining on a surface from which the paint film applique is removed after use is minimized or eliminated by providing, preferably a defect-free, colored polymer film as a carrier layer that is capable of absorbing more energy during stretching and/or impact than that associated with conventionally formed carrier layers. That is, the improved carrier layer used in paint film appliques of the invention is capable of exhibiting more effective damping qualities (as evidenced by its “peak loss factor” described herein) than those associated with conventionally formed carrier layers.
  • Including such a layer adjacent other layers within the paint film applique facilitates better continued bonding between the carrier layer and the other layers during application of the paint film applique and, hence, a lower chance of interlayer delamination and less residual adhesive and other material on a surface after removal of the paint film applique therefrom.
  • properties of individual layers within a paint film applique are better balanced according to the invention when using such a carrier layer.
  • a relatively high modulus topcoat layer is present within the paint film applique as in multi-stage paint (e.g., having the appearance of a conventional base coat/clear coat paint finish)
  • the carrier layer having a relatively high loss factor adjacent such a topcoat layer facilitates a more uniform rate and degree of recovery across thickness of the paint film applique when it is stretched and/or impacted.
  • topcoat layer is optional, it can be present in, for example, a multi-stage paint according to the invention comprising the carrier layer (or multiples thereof, if desired) in combination with any other color layer flanked by at least one adhesive layer on one side (i.e., the foregoing layers in combination being akin to a basecoat in a conventional paint system) and at least one topcoat layer (i.e., being akin to a clearcoat in a conventional paint system) on the other side.
  • a multi-stage paint according to the invention comprising the carrier layer (or multiples thereof, if desired) in combination with any other color layer flanked by at least one adhesive layer on one side (i.e., the foregoing layers in combination being akin to a basecoat in a conventional paint system) and at least one topcoat layer (i.e., being akin to a clearcoat in a conventional paint system) on the other side.
  • the number of stages associated with the paint generally corresponds to the number of topcoat layers within the paint film applique.
  • the paint film applique consists essentially of the following layers: the adhesive layer, the carrier layer, and the topcoat layer.
  • the paint film applique consists essentially of the following layers: the adhesive layer, the carrier layer, a distinct color layer, and the topcoat layer, with the carrier layer and the distinct color layer being positioned in any order between the adhesive layer and the topcoat layer.
  • An exemplary three-stage paint according to the invention can comprise either of the foregoing two-stage paints with an additional topcoat layer adjacent the first topcoat layer.
  • paint film appliques of the invention are advantageously not only capable of covering a surface with better balanced properties and leaving less residual adhesive after removal from a surface, but they also have enhanced recoverability to enable sufficient coverage and ease of application to non-planar surfaces.
  • “recoverability” refers to a material's ability to be stretched and recover to essentially its original state after stretching.
  • Preferred paint film appliques are capable of recovering to essentially their original state when stretched (i.e., elongated) to a length of up to about 125% of their initial length.
  • paint film appliques are capable of recovering to essentially their original state when stretched to a length of up to about 150% of their initial length.
  • paint film appliques are capable of elongating to a length of up to more than about 200% of their initial length before breaking.
  • a paint film applique advantageously comprises a defect-free, colored polymer film as a carrier layer.
  • the paint film applique with the defect-free, colored polymer film as a carrier layer also comprises at least one of a topcoat layer and an adhesive layer.
  • a paint film applique comprises sequential layers as follows: a defect-free, colored polymer film as a carrier layer; an optional color layer; and, an adhesive layer.
  • a paint film applique comprises sequential layers as follows: an optional color layer; a defect-free, colored polymer film as a carrier layer; and, an adhesive layer.
  • a paint film applique comprises sequential layers as follows: a topcoat layer; a defect-free, colored polymer film as a carrier layer; and an optional color layer.
  • a paint film applique comprises sequential layers as follows: a topcoat layer; an optional color layer; and a defect-free, colored polymer film as a carrier layer.
  • an adhesive layer in sequence such that the adhesive layer is outwardly exposed adjacent the optional color layer or carrier layer.
  • An exemplary paint film applique comprises sequential layers as follows: a topcoat layer; a defect-free, colored polymer film as a carrier layer; an optional color layer; and, an adhesive layer.
  • Another exemplary paint film applique comprises sequential layers as follows: a topcoat layer; an optional color layer; a defect-free, colored polymer film as a carrier layer; and, an adhesive layer.
  • overall thickness of the paint film applique is less than about 130 microns thick. In one embodiment, overall thickness of the paint film applique is about 100 microns to about 130 microns thick. In another embodiment, overall thickness of the paint film applique is about 50 microns to about 75 microns thick.
  • carrier layer By use of “carrier layer” herein, it is to be understood that the polymer film comprising the same carries (i.e., supports) at least one other layer (e.g., the optional adhesive layer, an optional color layer, or an optional topcoat layer) within a paint film applique.
  • the carrier layer is an essential element to providing paint film appliques having desired properties, whether those properties by aesthetic, functional, or otherwise.
  • the carrier layer is in-situ polymerized on an adjacent layer when assembling paint film appliques of the invention.
  • a defect-free, colored layer(s) of polymer film supporting at least one other layer functions as the carrier layer.
  • a carrier layer may also be referred to as a “base layer,” “support layer,” or a similar designation.
  • the carrier layer of paint film appliques of the invention is referred to as a “mid-ply layer” when it contains multiple layers (i.e., “n” number of individual layers).
  • the carrier layer of paint film appliques of the invention can be a single film layer according to other embodiments of the invention.
  • each of the “n” individual layers can be the same or different chemistries.
  • each of the “n” individual layers has essentially the same chemistry.
  • the carrier layer is colored, but another distinct color layer may also be provided depending on the application.
  • a color layer can be provided between the carrier layer and an adhesive layer.
  • a color layer can be provided on the outer surface of the carrier layer.
  • the carrier layer can be impregnated with a material (e.g., titanium dioxide) that causes the carrier layer to function as a reflective background, bringing out the color of the overlying color layer when the paint film applique is applied to a surface.
  • carrier layers used in paint film appliques of the invention are polyurethane-based.
  • polyurethane includes polymers containing urethane (also known as carbamate) linkages, urea linkages, or combinations thereof (i.e., in the case of poly(urethane-urea)s).
  • polyurethane-based carrier layers contain at least urethane linkages, urea linkages, or combinations thereof.
  • polyurethane-based carrier layers are based on polymers where the polymeric backbone has at least 40%, preferably at least 60%, and more preferably at least 80% urethane and/or urea repeat linkages formed in-situ during the polymerization process.
  • Polyurethane-based carrier layers are prepared according to methods of the invention by reacting components, which include at least one isocyanate-reactive (e.g., hydroxy-functional, such as polyol) component and at least one isocyanate-functional (e.g., polyisocyanate) component.
  • components of exemplary polymerizable compositions that are useful in the formation of polyurethane-based carrier layers according to methods of the invention are described in U.S. Pat. No. 8,828,303, entitled “Methods for Polymerizing Films In-Situ Using a Radiation Source,” incorporated herein by reference in its entirety.
  • the polymerizable compositions according to this aspect of the invention comprise, and more preferably, consist essentially of, aliphatic components.
  • polymerization of the polymerizable composition is initiated using at least one radiation source selected from ultraviolet radiation, thermal radiation, and electron beam radiation.
  • Methods of the invention can utilize continuous processing or batch processing.
  • continuous processing such as web-based, in-situ polymerization of the polyurethane-based carrier layer using relatively low energy ultraviolet radiation (e.g., having an energy of less than about 100 mW/cm 2 ), can be used in one embodiment of the invention.
  • batch processing such as coating an ultraviolet-curable composition onto a discrete substrate and irradiating the same to form the polyurethane-based carrier layer in-situ can be used in another embodiment of the invention.
  • the polymerizable composition for formation of the carrier layer is essentially free of solvents.
  • the polymerizable composition according to preferred aspects of the invention is a liquid at room temperature when applied to a substrate on which it is to be polymerized.
  • solvent-based processing typically entails use of elevated temperatures for effective removal of excess solvent from the polymerized composition.
  • carrier layers are essentially free of unreacted solvent. Accordingly, it is preferred that the polymerizable compositions from which they are formed are essentially free of solvents. Sustainable paint technology is facilitated according to these preferred embodiments.
  • the carrier layer comprises at least one color-inducing component.
  • color-inducing components include those that affect merely opacity of the carrier layer, those that affect merely spectral color of the carrier layer, and those that affect merely tint, shade, or tone of the carrier layer.
  • an opaque carrier layer and, hence, an opaque paint film applique is obtainable.
  • a tint is the mixture of a color with white, which increases lightness.
  • a shade is the mixture of a color with black, which reduces lightness.
  • a tone is produced either by the mixture of a color with gray, or by both tinting and shading. Mixing a color with any neutral color (including black, gray and white) reduces the chroma, or colorfulness, while the hue remains unchanged.
  • Color-inducing components useful in the present invention include, for example, what those of ordinary skill in the art generally refer to as pigments, paints, tints, metallic flakes, and dyes.
  • Pigment is an exemplary color-inducing component.
  • the color layer comprises ink. Any suitable commercially available ink can be used. Non-limiting examples of suitable inks include pigmented acrylic ink (including pigmented fast-dry acrylic ink), pigmented urethane ink, epoxy ink, and a urethane enamel coating such as that sold by PRC Desoto International, Inc. of Glendale, Calif. under the trade designation, DESOTHANE HS.
  • the carrier layer is pigmented
  • a lower loading of pigment is needed to impart the same color to the carrier layer than the amount of pigment required to be added to conventionally formed polymer films functioning as the carrier layer.
  • the resulting carrier layer is understood by those of ordinary skill in the art to be elastomeric in nature.
  • the color-inducing component is added to at least two of the multiple components that are compounded and reacted. As such, benefits in processing efficiency result.
  • any suitable additives can be present in the carrier layer.
  • Other additives are selected as known to those skilled in the art based on the intended application. Those skilled in the art are readily able to determine the amount of such additives to use for the desired effect.
  • the carrier layer has a thickness of about 5 microns to about 1,250 microns. According to a further embodiment, the carrier layer has a thickness of about 8 microns to about 260 microns.
  • Each of the “n” number of individual film layers therein can be as thin as about 5 microns and up to about 50 microns in thickness, the presence of thicker layers being particularly useful in, for example, ballistic applications.
  • a carrier layer having a thickness of about 220 microns or less is used according to one aspect of the invention.
  • the carrier layer has a thickness of about 180 microns or less.
  • the carrier layer can have a thickness of about 120 microns to about 180 microns. Not only is recoverability of the carrier layer, and hence overall paint film applique, enhanced by using a thinner carrier layer, overall cost of the paint film applique is reduced in this manner.
  • paint film appliques of the invention do not rely on such a layer as the carrier layer, the result being an unexpected improvement in one or more desired properties in addition to the processing efficiencies imparted thereby.
  • problems associated with dimensional instability of extruded films such as those described in U.S. Pat. No. 5,985,079—can be minimized.
  • an improved polyurethane-based carrier layer in paint film appliques of the invention is polymerized in-situ.
  • U.S. Pat. No. 8,828,303 and U.S. Patent Publication No. US-2011-0137006-A1 both incorporated herein by reference, describe methods and films formed by such in-situ polymerization.
  • use of an in-situ polymerized carrier layer to impart color to the paint film applique was found to facilitate improvements in physical properties desired in addition to the processing efficiencies imparted thereby.
  • in-situ polymerized carrier layers of the invention are not generally thermoplastic in nature. Nevertheless, in-situ polymerized carrier layers of the invention look and feel very similar to conventional extruded carrier layers.
  • An improved polymer architecture provides in-situ polymerized carrier layers of the invention with some significantly different properties, including dimensional stability.
  • solvent resistance Another significantly different property is solvent resistance.
  • the solvent resistance of preferred in-situ polymerized carrier layers of the invention approximates that associated with conventional crosslinked (i.e., thermoset) materials.
  • thermoset crosslinked (i.e., thermoplastic) materials.
  • extruded materials will generally dissolve completely when immersed in a solvent, e.g., tetrahydrofuran, while the in-situ polymerized materials of the invention exhibit only minor swelling when immersed in the same solvent.
  • the storage modulus of preferred in-situ polymerized carrier layers of the invention is significantly different, however, in that it exhibits a rubbery plateau region, a characteristic that is consistent with lightly crosslinked elastomers.
  • the storage modulus of preferred in-situ polymerized polyurethane-based carrier layers is about two orders of magnitude higher than that of thermoplastic polyurethane at conventional extrusion temperatures.
  • the improved polyurethane-based carrier layer in paint film appliques of the invention has a peak loss factor of at least about 0.5, at least about 0.8, or even at least about 1.2 when tested as a standalone film according to the Loss Factor Test Method described below.
  • the peak loss factor tested according to the Loss Factor Test Method described below of extruded (i.e., conventionally formed) polyurethane carrier layer films i.e., as illustrated by the data curves labeled A, B, and C, representing extruded polyurethane-based carrier layers commercially available from Argotec, LLC (Greenfield, Mass.) under the respective trade designations, ARGOTEC 49510, ARGOTEC 49510-60DV, and ARGOTEC 46510
  • FIG. 1 the peak loss factor tested according to the Loss Factor Test Method described below of extruded (i.e., conventionally formed) polyurethane carrier layer films
  • ARGOTEC 49510, ARGOTEC 49510-60DV, and ARGOTEC 46510 was significantly lower than those to which a color-inducing component can
  • the peak loss factor tested for extruded polyurethane carrier films occurred at about 25° C.
  • the peak loss factor tested for polyurethane-based films used in combination with a color-inducing component as the carrier layer in paint film appliques of the invention occurred at about a temperature of at least about 35° C.
  • the half-height loss factors occurred across a temperature span of less than about 40° C., less than about 30° C. in some embodiments, and even less than about 20° C. in some embodiments, for tested polyurethane-based films used in combination with a color-inducing component as the carrier layer in paint film appliques of the invention as opposed to occurring across a temperature span of greater than about 40° C., and even greater than about 45° C. in the exemplified embodiments, for extruded polyurethane-based polymer films.
  • the loss factor which is one-half the value of that of the peak loss factor, of which there are two for each curve
  • the half-height loss factor was measured to be 53° C.
  • the half-height loss factor was measured to be 49° C.
  • the half-height loss factor was measured to be 18° C.
  • the half-height loss factor was measured to be 22° C.
  • the storage moduli tested according to the Storage Modulus Test Method described below of extruded (i.e., conventionally formed) polyurethane films decreased to a particular value at relatively lower temperatures than those of polyurethane-based polymer films used in combination with a color-inducing component as the carrier layer in paint film appliques of the invention.
  • carrier layers in paint appliques of the invention are not only colored, but also defect-free.
  • a “defect” is understood to be a visual imperfection such as, for example, a gel particle, a die line, or a gauge line.
  • “defect-free” refers to polymer films with no more than the maximum allowable defects shown in Table 1, as set forth in terms of the maximum defect diameter.
  • conventional p-gels cannot form as the polymer film used as the carrier layer is not formed in a conventional reactor.
  • conventional e-gels cannot form as the polymer film is not formed using a conventional extruder.
  • processing aids e.g., slip and antiblock additives—that are known to contribute to gel formation and that would conventional be required and used in such methods of formation need not be, and are preferably excluded from, methods for formation of the polymer films when assembling paint film appliques according to the invention.
  • the resulting polymer films are defect-free and colored, and the paint film appliques of which they are a part have reduced defects.
  • each color layer distinct from the defect-free, colored polymer film can be used in further embodiments of paint film appliques of the invention, the following description is made with reference to one such optional color layer for simplicity only. Recognize that, if multiple color layers are used, each color layer can be the same or different.
  • the color layer comprises any suitable material and provides desired aesthetics when the paint film applique is applied to a surface.
  • the color layer can be a continuous or discontinuous layer. Note that the color layer may consist essentially of graphics, patterns, and the like, which results in the layer being a discontinuous layer and/or a non-planar layer.
  • the color layer comprises at least one color-inducing component.
  • color-inducing components include those that affect merely opacity of the color layer, those that affect merely spectral color of the color layer, and those that affect merely tint, shade, or tone of the color layer.
  • an opaque color layer and, hence, an opaque paint film applique is obtainable.
  • a tint is the mixture of a color with white, which increases lightness.
  • a shade is the mixture of a color with black, which reduces lightness.
  • a tone is produced either by the mixture of a color with gray, or by both tinting and shading. Mixing a color with any neutral color (including black, gray and white) reduces the chroma, or colorfulness, while the hue remains unchanged.
  • Color-inducing components useful in the present invention include, for example, what those of ordinary skill in the art generally refer to as pigments, paints, tints, metallic flakes, and dyes.
  • Pigment is an exemplary color-inducing component.
  • the color layer comprises ink. Any suitable commercially available ink can be used. Non-limiting examples of suitable inks include pigmented acrylic ink (including pigmented fast-dry acrylic ink), pigmented urethane ink, epoxy ink, and a urethane enamel coating such as that sold by PRC Desoto International, Inc. of Glendale, Calif. under the trade designation, DESOTHANE HS.
  • any suitable additives can optionally be included in the color layer.
  • stabilizers e.g., antioxidants, heat stabilizers, and UV-stabilizers
  • crosslinkers e.g., aluminum or melamine crosslinkers
  • corrosion inhibitors e.g., corrosion inhibitors, plasticizers, photocrosslinkers, additional colorants, fillers, and other conventional additives as known to those of ordinary skill in the art
  • additional colorants e.g., fillers, and other conventional additives as known to those of ordinary skill in the art
  • fillers e.g., fillers, and other conventional additives as known to those of ordinary skill in the art can be incorporated into the color layer.
  • the color layer is essentially free of components that may tend to migrate to the outer surface of the paint film applique or to an interface therein, where such components may promote interlayer delamination or otherwise detrimentally affect the adherence of the paint film applique to adjacent surfaces or layers.
  • the color layer is also preferably resistant to chemicals to which it may be exposed during use of the paint film applique.
  • the color layer is resistant to degradation by water and hydraulic fluids (e.g., those sold by TBM, Inc. of St. Louis, Mo. under Solutia, Inc.'s SKYDROL trade designation), particularly when the color layer comprises an outer layer of the paint film applique after it is applied to a surface.
  • the color layer can be formed according to any suitable method.
  • the color layer is solution-cast from a polymerized composition.
  • the color layer can be cast from an organic solvent solution.
  • the color layer can be cast from an aqueous solution.
  • the color layer is polymerized in-situ.
  • U.S. Pat. No. 8,828,303 and U.S. Patent Publication No. US-2011-0137006-A1 describe methods and films formed by such in-situ polymerization.
  • a preferred aspect of this embodiment is on-web polymerization of the color layer from a solvent-free polymerizable composition that is liquid at room temperature in neat form.
  • the color layer is a reactive polymer film.
  • the polymer film comprises chemical functionality enabling the carrier layer polymerized thereon to form covalent bonds with the color layer at the interface between the two adjacent layers.
  • the reactive polymer film comprises hydroxyl functional groups capable of reacting with, for example, isocyanate functional groups in the polymerizable composition forming the carrier layer.
  • the color layer comprises any suitable thickness.
  • the color layer has a thickness of about 5 microns to about 1,250 microns.
  • the color layer has a thickness of about 8 microns to about 260 microns.
  • the color layer has a thickness of about 12 microns to about 125 microns.
  • the color layer has a thickness of about 25 microns to about 75 microns.
  • the color layer has a thickness of about 8 microns to about 25 microns.
  • thickness of the color layer can vary substantially without departing from the spirit and scope of the invention. While flexibility of the overall paint film applique is enhanced by using a thinner color layer, overall cost of the paint film applique can also be reduced in this manner.
  • the adhesive layer When present, the adhesive layer is positioned adjacent and on a major planar side of the carrier layer and any optional additional color layers, opposite that major planar side from that on which any optional topcoat layer is present.
  • Any suitable adhesive can be used for the adhesive layer according to the invention.
  • the adhesive layer comprises a pressure-sensitive adhesive.
  • (meth)acrylate—i.e., acrylate and methacrylate—chemistry is preferred.
  • suitable chemistries include, for example, those based on synthetic and natural rubbers, polybutadiene and copolymers thereof, polyisoprene and copolymers thereof, and silicones (e.g., polydimethylsiloxane and polymethylphenylsiloxane). Any suitable additives can be present in conjunction with the base polymer in the adhesive layer.
  • an adhesive based on 2-ethyl hexyl acrylate, vinyl acetate, and acrylic acid monomers polymerized as known to those skilled in the art was found useful in one embodiment of the invention.
  • the adhesive can be crosslinked, for example, using conventional aluminum or melamine crosslinkers.
  • the adhesive layer has a thickness of about 5 microns to about 150 microns. In a further embodiment, the adhesive layer has a thickness of about 10 microns to about 100 microns. In yet a further embodiment, the adhesive layer has a thickness of about 30 microns to about 100 microns. However, the thickness of the adhesive layer can vary substantially without departing from the spirit and scope of the invention.
  • the adhesive layer can be protected using, for example, a conventional release liner.
  • the sheet can be stored and shipped easily in roll or other forms until its application.
  • any outwardly exposed non-adhesive layer on a major planar side of the carrier layer and, when present, any optional color layers included therewith in a laminate, opposite any adhesive layer in paint film appliques of the invention is referred to as a “topcoat layer.”
  • the optionally present topcoat layer is an outwardly exposed, exterior layer of the paint film applique when the paint film applique is applied to an article.
  • Any suitable type of material can be used for the topcoat layer in paint film appliques of the invention.
  • the topcoat layer can comprise as its base polymer a polycarbonate, a polyvinyl fluoride, a poly(meth)acrylate (e.g., a polyacrylate or a polymethacrylate), a polyurethane, modified (e.g., hybrid) polymers thereof, or combinations thereof.
  • a polycarbonate e.g., a polycarbonate or a polymethacrylate
  • a polyurethane modified (e.g., hybrid) polymers thereof, or combinations thereof.
  • U.S. Pat. No. 4,476,293 for a description of exemplary polycarbonate-based polyurethanes useful for the topcoat layer of the invention.
  • a topcoat layer is applied (e.g., by spraying or painting it) on the paint film applique after adherence of the paint film applique to an underlying surface.
  • the topcoat layer is applied such that no paint film applique is exposed to the environment when the applique is adhered to a surface for use.
  • the topcoat layer preferably covers and protects seams between adjacent paint film appliques from exposure to the environment.
  • the topcoat layer is one of the layers included within the paint film applique.
  • a multi-stage paint according to the invention comprises the carrier layer (or multiples thereof, if desired), optionally in combination with at least one color layer, flanked by at least one adhesive layer on one side (i.e., the foregoing layers in combination being akin to a basecoat in a conventional paint system) and at least one topcoat layer (i.e., being akin to a clearcoat in a conventional paint system) on the other side.
  • a two-stage paint according to this exemplary embodiment has one topcoat layer.
  • a three-stage paint according to this exemplary embodiment has two adjacent, but distinct, topcoat layers.
  • the topcoat layer can comprise any suitable chemistry.
  • the topcoat layer provides one or more properties including the following: environmental resistance, chemical resistance, abrasion resistance, scratch resistance, optical transparency, and other often desirable properties.
  • the carrier layer or color layer whichever would be otherwise outwardly exposed when applying the paint film applique to an article, can provide the properties desired, making the need for a topcoat layer moot, especially when that is not the case, a topcoat layer is beneficially present.
  • the topcoat layer comprises a material with the following properties: non-yellowing, gloss retention (e.g., maintaining of gloss on the order of about 80 to about 90 gloss units), and extensibility.
  • the topcoat layer comprises a polyurethane-based material.
  • suitable topcoats are commercially available, including for example, polyurethane coatings sold by PRC Desoto International, Inc. of Glendale, Calif. under the DESOTHANE HS trade designation (e.g., DESOTHANE HS BAC 900 (CA8000/B900A or CA8000/B900B)) or those sold by Akzo-Nobel Aerospace Coatings of Waukegan, Ill. under the ECLIPSE trade designation (e.g., ECLIPSE BAC 900).
  • chemistry of the topcoat layer is selected to facilitate its bonding to the underlying layers of the paint film applique.
  • the surface tension of the underlying layer of the paint film applique is within about 5 dynes per centimeter of the surface tension of the overlying topcoat layer.
  • the topcoat layer comprises excess isocyanate-functional moieties reactive with excess isocyanate-reactive moieties in the underlying layer of the paint film applique on which it is applied.
  • covalent bonds form between the topcoat layer and the underlying layer of the paint film applique. Such covalent bonds are typically more robust than other types of bonds (e.g., those relying on Van Der Waals forces, such as those typically associated with use of pressure sensitive adhesives) and are, therefore, preferred.
  • the topcoat layer is of relatively high molecular weight. That is, while the topcoat layer can be formed by extrusion according to some embodiments of the invention, the topcoat layer is preferably of a sufficient molecular weight that extrusion thereof is not practical (i.e., if a polyurethane, the polyurethane is not considered extrusion-grade polyurethane by those of ordinary skill in the art). In a preferred embodiment, the topcoat layer is in-situ polymerized in addition to the carrier layer of the invention.
  • the topcoat layer when present, has a thickness of about 1 microns to about 28 microns. In a further embodiment, the topcoat layer has a thickness of about 5 microns to about 20 microns. In still a further embodiment, the topcoat layer has a thickness of about 5 microns to about 15 microns. In yet a further embodiment, the topcoat layer has a thickness of about 5 microns to about 12 microns. In yet a further embodiment, the topcoat layer has a thickness of about 5 microns to about 7 microns. However, the thickness of the topcoat layer can vary substantially without departing from the spirit and scope of the invention.
  • a polymer liner e.g., a clear polyester liner
  • a polymer liner e.g., a clear polyester liner
  • each of the individual layers of the paint film applique is formed and assembled into a multi-layer paint film applique according to the knowledge of those skilled in the art.
  • the carrier layer is formed in-situ on an adjacent layer, which may comprise an optional, distinct color layer, the optional adhesive layer, and/or optional topcoat layer of the paint film applique.
  • any suitable method can be used.
  • an adhesive film of the desired thickness can be cast onto a release film according to one embodiment and as known to those skilled in the art.
  • the adhesive film supported on the release film can then be assembled with the carrier layer, with the release film being removed before adherence of the paint film applique to a surface of an article.
  • each of the other individual layers of the paint film applique is prepared before assembly into the paint film applique. Any suitable method for formation of each of the other individual layers can be used as known to those skilled in the art.
  • any suitable method can be used.
  • a film comprising a topcoat layer of a desired thickness can be cast onto a smooth film (e.g., polyester film) according to one embodiment and as known to those skilled in the art to form a supported topcoat layer.
  • the supported topcoat layer is then assembled onto the outwardly exposed side of the carrier layer, or a laminate comprising the carrier layer and an optional color layer, when present—i.e., on a major surface opposite from that on which any optional adhesive layer is assembled.
  • the smooth film used for formation of the topcoat layer can remain in the assembly until application of the paint film applique to a surface of an article in order to provide extra protection during shipping and storage of the sheet.
  • any suitable method can be used to assemble the topcoat layer with remaining layers of the paint film applique.
  • the topcoat layer is formed by direct coating the topcoat layer onto the remaining layers of the paint film applique according to conventional methods.
  • paint film applique's layers can be formed simultaneously by, for example, co-extrusion of the polymerizable compositions starting in their liquid form, which step is typically performed at a temperature below about 40° C.—e.g., about room temperature in one embodiment.
  • layers other than the carrier layer may be polymerized in-situ into a film format as described in, for example, U.S. Pat. No. 8,828,303 and U.S. Patent Publication No. US-2011-0137006-A1. No matter what method is used, the process can be a continuous or batch process.
  • Paint film appliques of the invention are useful in a range of indoor and outdoor applications in, for example, the transportation, architectural and sporting goods industries. Paint film appliques can advantageously be applied to at least a portion of a surface of any article where paint is desired. Such articles include, for example, motorized vehicles (e.g., automobiles and airplanes) and non-motorized vehicles (e.g., conventional bicycles) amongst a multitude of other applications.
  • the surface to which the paint film appliques are applied can be otherwise painted or unpainted.
  • paint film appliques of the invention can have textured outwardly exposed surfaces when applied to an underlying substrate, preferably paint film appliques of the invention have smooth surfaces and a substantially uniform thickness throughout in order to maximize their capability of providing desired aesthetic properties to a surface.
  • a paint film applique is applied to a surface, preferably in such a way as to conform to the shape of the surface. Particularly when applying pain film appliques to non-planar surfaces, recoverability is important and preferred. If a paint film applique is not very recoverable, micro-cracking can occur when the applique is stretched too far. Relief cuts may be needed in that case in order to apply such paint film appliques to substrates, particularly those having a complex surface of convex and concave features. However, according to preferred embodiments of the invention, relief cuts are not necessary when applying paint film appliques of the invention to complex surfaces. Such paint film appliques are readily conformable due to their recoverability.
  • Paint film appliques of the invention can be readily and easily applied to a surface of an article based on knowledge of those skilled in the art.
  • the adhesive layer if present, is generally adhered to the surface to which the paint film applique is applied after removal of any release liner present thereon to expose the adhesive.
  • the paint film applique can be more easily repositioned before being firmly adhered to a surface.
  • a disc of ARGOTEC 49510 thermoplastic polyurethane film commercially available from Argotec, LLC (Greenfield, Mass.), was evaluated according to the Solvent Resistance Test Method described above. After five minutes, the disc was no longer intact and confirmed to have completely dissolved.
  • a disc of ARGOTEC 46510 thermoplastic polyurethane film commercially available from Argotec, LLC (Greenfield, Mass.), was evaluated according to the Solvent Resistance Test Method described above. After five minutes, the disc was no longer intact and confirmed to have completely dissolved.
  • a disc of Film 3 prepared according to the Exemplary Formulations below was evaluated according to the Solvent Resistance Test Method described above. After immersion for six hours, the diameter of the disc was measured to be 160% of its original size. After air drying, the disc had returned to its original 25-mm diameter, confirming evaporation of the THF.
  • Defect-free polymer films and paint film appliques comprising the same are preparable according to methodology described in U.S. Pat. No. 8,828,303 and using components for each layer described below.
  • Three different carrier layers for paint film appliques of the invention are formed based on the components described in Table 2 and the proportionate amounts shown in Tables 3-5. Weight percentages are reported based on overall weight of the resulting film comprising the carrier layer.
  • An acrylic-based polyurethane topcoat layer for paint film appliques of the invention is formed from aliphatic acrylic polyols and aliphatic polyisocyanate polymer, which components are polymerized on the carrier layer in-situ after being coated to a thickness of about 10 microns.
  • An adhesive layer for paint film appliques of the invention is formed based on the Adhesive component described in Table 2 and positioned on the carrier layer opposite the topcoat layer.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Paints Or Removers (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
US16/301,713 2016-09-20 2017-09-14 Paint Film Appliques with Reduced Defects, Articles, and Methods Abandoned US20190136095A1 (en)

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PCT/US2017/021982 WO2017156507A1 (en) 2016-03-11 2017-03-11 Defect-free polymer films and related protective sheets, articles, and methods
US16/301,713 US20190136095A1 (en) 2016-09-20 2017-09-14 Paint Film Appliques with Reduced Defects, Articles, and Methods
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