Burn-off protective coating

Abstract

This provides a protected substrate that prevents damage to large substrates during transport, including corrosion damage induced at the seams where protective sheets are layered. [Solution] The protected substrate 100 includes a planar substrate 112 having a surface and a burn-off temporary protective layer 114 placed on at least a portion of the surface. The burn-off temporary protective layer includes wax, polyolefin, polyester, polycarbonate, polyether, or some combination thereof. The burn-off temporary protective layer is removable by a heat treatment process that does not cause substantial damage to the surface.

Description

Technical Field

[0001] Cross - References to Related Applications This application claims priority to U.S. Provisional Application No. 62 / 691,814, filed Jun. 29, 2018, the disclosure of which is hereby incorporated by reference in its entirety.

[0002] Background of the Invention Field of the Invention The present invention relates to a protected substrate and a method for protecting a substrate.

Background Art

[0003] Description of the Related Art Large substrates, such as large glass sheets, are often damaged during shipment from the manufacturing plant to the customer site. As a result, the substrate becomes unsuitable for installation, payment rejection to the manufacturer occurs, and the construction project is delayed. One way to protect large substrates from damage is to tape or hold together two small protective sheets placed on top of the large substrate.

Summary of the Invention

Problems to be Solved by the Invention

[0004] This approach has certain drawbacks. For example, small capillaries can be formed at the seams of the two small protective sheets where the tape is applied. The small capillaries attract water and cause corrosion at the seam location. As a result, damage occurs, leading to payment rejection and project delays. Therefore, a protected substrate that prevents damage to a large substrate during transportation, including corrosion damage induced at the seams where the protective sheets are overlapped, is desired.

Means for Solving the Problems

[0005] The present invention relates to a planar substrate including a surface; and a protected substrate including a burn-off temporary protective layer disposed on at least a portion of the surface, wherein the burn-off temporary protective layer includes wax, polyolefin, polyester, polycarbonate, polyether, or several combinations thereof, and the burn-off temporary protective layer is removable by a heat treatment process that does not cause substantial damage to the surface.

[0006] The present invention also relates to a method for protecting a planar substrate including a surface, comprising applying (coating) a material to form a burn-off temporary protective layer on at least a first portion of the surface, wherein the burn-off temporary protective layer includes wax, polyolefin, polyester, polycarbonate, polyether, or several combinations thereof, and the burn-off temporary protective layer is removable by a heat treatment process that does not substantially damage the surface.

[0007] The present invention also relates to a method for removing a burn-off temporary protective layer from a coated substrate, comprising the following steps: providing a coated substrate including a surface on which a burn-off temporary protective layer is applied in part, wherein the burn-off temporary protective layer includes wax, polyolefins (e.g., polyethylene, polypropylene, etc.), polyesters (e.g., polylactic acid, polycaprolactone, etc.), polycarbonates (e.g., polyethylene carbonate, polypropylene carbonate, etc.), polyethers (e.g., polyoxymethylene, etc.), or some combination thereof; and removing the burn-off temporary protective layer from the surface by burning off the burn-off temporary protective layer to form an unprotected substrate, wherein the burn-off temporary protective layer can be removed by a heat treatment process that does not substantially damage the surface.

[0008] The present invention also relates to a protected substrate comprising: a planar substrate including a surface; a temporary protective layer disposed on at least a portion of the surface; a first temporary protective sheet disposed on at least a first portion of the surface; and a second temporary protective sheet disposed on at least a second portion of the surface, wherein the overlapping portion of the second temporary protective sheet overlaps with the overlapping portion of the first temporary protective sheet by overlap, where the gap is defined by the overlap between the second temporary protective sheet and the portion of the surface, and the portion of the temporary protective layer is disposed between the second temporary protective sheet and the portion of the surface.

[0009] The present invention also relates to a protected substrate and includes: a planar substrate including a surface; a first temporary protective sheet placed on a first portion of the surface; a second temporary protective sheet placed on a second portion of the surface, wherein a third portion of the surface is not covered by the first temporary protective sheet and the third portion of the surface is not covered by the second temporary protective sheet; and a temporary protective layer on at least the third portion of the surface, wherein the temporary protective layer is placed directly beneath the first and / or second protective sheets and between the substrate and the first and / or second temporary protective sheets.

[0010] The present invention also relates to a method for protecting a substrate, the method comprising the following steps: providing a planar substrate including a surface; applying (coating) a material to form a temporary protective layer on at least a first portion of the surface; adhering a first temporary protective sheet on a second portion of the surface, wherein a portion of the first temporary protective sheet overlaps with the first portion of the temporary protective layer; and adhering a second temporary protective sheet on the second portion of the temporary protective layer and a third portion of the surface, wherein an overlap is formed between the first temporary protective sheet and the second temporary protective sheet, and the gap is defined by the overlap between the second temporary protective sheet and the surface.

[0011] The present invention also relates to a method for removing a temporary protective layer from a coated substrate, comprising the following steps: providing a protected substrate, which includes a planar substrate including a surface; a temporary protective layer disposed on at least a portion of the surface; a first temporary protective sheet disposed on at least a first portion of the surface; and a second temporary protective sheet disposed on at least a second portion of the surface, wherein the overlapping portion of the second temporary protective sheet overlaps with the overlapping portion of the first temporary protective sheet by overlap; where the gap is defined by the overlap between the second temporary protective sheet and the portion of the surface, and the portion of the temporary protective layer is disposed between the second temporary protective sheet and the portion of the surface; peeling off the first temporary protective sheet and / or the temporary protective sheet; and removing the temporary protective layer from the surface by combustion, vaporization, solvent removal, or by peeling off the temporary protective layer to form an unprotected substrate. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 shows a protected substrate according to a first non-limiting embodiment.

[0013] [Figure 2] Figure 2 shows a protected substrate according to a second, non-limiting embodiment.

[0014] [Figure 3] Figure 3 shows a protected substrate according to a third, non-limiting embodiment.

[0015] [Figure 4] Figure 4 shows a protected substrate according to a fourth non-limiting embodiment.

[0016] [Figure 5] Figure 5 shows a protected substrate according to a fifth non-limiting embodiment.

[0017] [Figure 6]FIG. 6 shows a protected substrate according to a sixth non - limiting embodiment.

[0018] [Figure 7] FIG. 7 shows a protected substrate according to a seventh non - limiting embodiment.

[0019] [Figure 8] FIG. 8 shows a protected substrate according to an eighth non - limiting embodiment.

[0020] [Figure 9] FIG. 9 shows a protected substrate according to a ninth non - limiting embodiment.

[0021] [Figure 10] FIG. 10 shows a protected substrate according to a tenth non - limiting embodiment.

[0022] [Figure 11] FIG. 11 shows a protected substrate according to an eleventh non - limiting embodiment.

MODE FOR CARRYING OUT THE INVENTION

[0023] Description of the Invention For the purposes of the following description, the terms “end,” “upper,” “lower,” “right,” “left,” “vertical,” “horizontal,” “top,” “bottom,” “lateral,” “longitudinal,” and their derivatives shall be used in relation to the present invention as shown in the drawings. However, it should be understood that the present invention may envision various alternative modifications and step sequences unless expressly otherwise specified. It should also be understood that certain devices and processes shown in the accompanying drawings and described in the following specification are merely exemplary embodiments or aspects of the present invention. Accordingly, certain dimensions and other physical characteristics relating to the embodiments or aspects disclosed herein should not be considered limiting.

[0024] For the purposes of the following detailed description, it should be understood that the present invention may assume various alternative modifications and step sequences, unless otherwise expressly specified. Furthermore, except for the examples of operation or otherwise indicated, all numbers used in the specification and claims should be understood in all cases to be modified by the term "about". Thus, unless otherwise indicated, the numerical parameters described in the following specification and appended claims are approximations that may vary depending on the desired characteristics to be obtained by the present invention. At the very least, each numerical parameter should be interpreted by applying ordinary rounding techniques, at least in light of the reported number of significant figures, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims.

[0025] It should be understood that any numerical range listed herein is intended to include all subranges contained therein. For example, the range "1 to 10" is intended to include all subranges between (and including) the listed minimum value of 1 and the listed maximum value of 10, i.e., subranges where the minimum value is 1 or greater and the maximum value is 10 or less.

[0026] With respect to the layers of materials described herein, the term “over” means that the material is located further from the substrate on which it is laid. For example, a second layer placed “on” a first layer means that the second layer is located further from the substrate than the first layer. The second layer may be in direct contact with the first layer, or one or more other layers may be placed between the first and second layers.

[0027] The terms "polymer" or "polymeric" include oligomers, homopolymers, copolymers, and terpolymers, for example, polymers formed from two or more types of monomers or polymers.

[0028] The term "includes" is synonymous with "comprises".

[0029] Referring to Figures 1-11, the present invention relates to a protected substrate and a method for protecting a substrate as described herein.

[0030] Referring to Figure 1, the protected substrate 100 includes a substrate 112. The substrate 112 may be made of any suitable material, may be manufactured in a manufacturing facility and shipped to a customer site, and as a result, the substrate 112 may be susceptible to damage during transport. In some non-limiting examples, the substrate 112 may include glass. The glass may include soda-lime glass. In other non-limiting examples, the substrate 112 may include metal or wood. The substrate may be made of any material that may be susceptible to damage during transport (e.g., scratching, corrosion, etc.). The substrate may be a coated substrate having a functional coating layer on a bare substrate, such as coated glass. As used herein, the term “functional coating” refers to a coating that provides a functional benefit to a surface beyond surface decoration. Non-limiting examples include coatings that give a surface optical, structural, electrical, hygienic, thermal, and / or physicochemical properties. Non-limiting examples of functional coatings include low-e (low-emission) coatings, hydrophilic coatings, hydrophobic coatings, lipophilic coatings, low-friction coatings, antimicrobial coatings, anti-fingerprint coatings, anti-fogging coatings, self-cleaning coatings, easy-cleaning coatings, transparent conductive coatings, and at least one combination thereof.

[0031] In some non-limiting embodiments, the substrate 112 may be a large substrate such that multiple protective sheets are required to protect the entire surface of the substrate 112 during transport. In some examples, the large substrate may have a length exceeding 100 inches, such as at least 130 inches, at least 160 inches, at least 190 inches, at least 220 inches, at least 250 inches, etc. In some examples, the large substrate may have a width exceeding 100 inches, such as at least 130 inches, at least 160 inches, at least 190 inches, at least 220 inches, at least 250 inches, etc. One non-limiting example of such a planar substrate includes a glass sheet.

[0032] In some non-limiting embodiments, the substrate 112 may be a planar substrate, such as a flat glass sheet. As used herein, “planar substrate” refers to a flat substrate.

[0033] Continuing with reference to Figure 1, the protected substrate 100 further includes a temporary protective layer 114 disposed on at least a portion of the surface of the substrate 112. The temporary protective layer 114 is applied to the surface of the substrate 112 and, when solidified, forms a layer defined as the temporary protective layer 114. The temporary protective layer 114 may be disposed on at least a portion of the surface of the substrate 112, and in some non-limiting embodiments, it may be disposed on at least the entire surface of the substrate 112. The temporary protective layer 114 may be applied to at least a portion of the edge of the substrate 112.

[0034] The temporary protective layer may include materials containing wax, organic oils (e.g., tung oil), polyolefins, poly(meth)acrylates, polyesters, alkenes, polyethylene, polypropylene, emulsions thereof, or some combinations thereof. The temporary protective layer may include polylactic acid (PLA), polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or some combinations thereof. The wax may include stearic acid, paraffin, carnauba wax, microcrystalline wax, polyethylene wax, or some combinations thereof. Examples of wax emulsions include those available from Michelman, Inc. (Cincinnati, Ohio) (e.g., MGRD 1350, ML160, ME62330, Aqua240 PH90602L, ME48040M2) or from BYK-Chemie GmbH (Wesel, Germany) (e.g., AQUACER 526, AQUACER 541, AQUACER 1031, AQUACER 8500). Wax emulsions can be paraffin / polyethylene emulsions, anionic polyamide emulsions, anionic carnauba emulsions, amine-dispersed carnauba emulsions, ethylene acrylic acid emulsions, nonionic microcrystalline emulsions, or combinations thereof. In some non-limiting examples, the temporary protective layer may contain an alkane, ester, or carboxylic acid and may have, based on the total weight of the temporary protective layer, at least 40% by weight, for example, at least 50% by weight, at least 60% by weight, at least 70% by weight, at least 80% by weight, or at least 90% by weight of carbon.

[0035] The temporary protective layer 114 may include a material such that, when included in the composition, applied to a substrate, and solidified to form a layer, the layer exhibits a water contact angle (WCA) (in contact with water) of at least 60°, for example, at least 70°, or at least 80°. The temporary protective layer 114 may include a hydrophobic material. A hydrophobic material is defined herein as a material such that, when included in the composition, applied to a substrate, and solidified to form a layer, the layer exhibits a WCA (in contact with water) of at least 90°, for example, at least 100°, at least 110°, at least 120°, at least 130°, at least 140°, or at least 150°.

[0036] The temporary protective layer 114 may include a material having a melting point of at least 60°C, for example, at least 70°C or at least 80°C. The temporary protective layer may have a melting point of 60°C to 350°C. The temporary protective layer 114 may include a material that, when solidified, is impermeable to water and other standard processing fluids (e.g., coolants, cutting fluids, etc.). The temporary protective layer 114 can provide increased corrosion protection to the substrate 112 compared to the same substrate without the temporary protective layer 114 placed on it.

[0037] In some non-limiting examples, the material applied to form the temporary protective layer may include an emulsion containing a hydrophobic material, water, and a surfactant, the surfactant being a nonionic or ionic surfactant (e.g., a cationic or anionic surfactant). The material applied to form the temporary protective layer 114 may be thermoplastic or thermosetting. The material applied to form the temporary protective layer 114 may include a material containing a hydrophobic material dissolved in a solvent. The material applied to form the temporary protective layer may include a UV-curable or thermosetting material that, when applied to the surface of a substrate and exposed to a UV or heat source, causes crosslinking of the applied material on the substrate. The material applied to form the temporary protective layer may include a two-component (2K) resin containing separate components that, when mixed together, react to crosslink the material when the material is applied to the surface of a substrate.

[0038] In some non-limiting examples, the material is heated to at least its Tg, and then applied (coated) at a temperature that is at least its Tg. In other non-limiting examples, the material is applied (coated) at a temperature lower than its Tg, and then heated to a temperature suitable for softening, such as above its Tg. Non-limiting examples include carnauba wax such as ML160, available from Michelman, Inc. (Cincinnati, Ohio), which may require heat treatment to a temperature above its Tg of 63°C, such as at least 70°C, at least 80°C, or at least 90°C.

[0039] The temporary protective layer 114 may be a removable layer from the surface of the substrate 112 even after the composition of the temporary protective layer 114 has been applied (coated) and solidified on the substrate 112 to form the temporary protective layer 114. The temporary protective layer 114 may be removed without substantially damaging the substrate 112 or making it unsuitable for its intended use (as defined below). The temporary protective layer 114 may be removed from the substrate 112 by any sufficient means, such as burning, vaporization, solvent removal, or peeling of the temporary protective layer 114 from the substrate 112.

[0040] The temporary protective layer 114 may have a thickness ranging from 10 nm to 5000 μm, for example, 10 nm to 1000 μm, 10 nm to 500 μm, 0.5 μm to 100 μm, 0.5 μm to 10 μm, 10 μm to 30 μm, or 50 μm to 100 μm. The thickness must be sufficiently thick to form a continuous layer. The temporary protective layer 114 may also be sufficiently thick to provide corrosion protection to the substrate 112. The temporary protective layer 114 may be sufficiently thin so that no substantial amount of residue remains on the substrate 112 upon combustion, vaporization, or thermal decomposition of the temporary protective layer 114. In this way, the temporary protective layer 114 may be combustible.

[0041] Continuing to refer to Figure 1, the protected substrate 100 may further include a plurality of temporary protective sheets, including a first temporary protective sheet 116 and a second temporary protective sheet 118. The first temporary protective sheet 116 and the second temporary protective sheet 118 may be made of plastic materials such as polyethylene, polypropylene, polyester, polyethylene terephthalate, nylon, polyvinyl chloride, vinyl, polylactic acid, polyoxymethylene, or some combination thereof. In some non-limiting examples, the second temporary protective sheet 118 may include a plastic film and a pressure-sensitive adhesive applied on the plastic film. Examples of commercially available protective sheets include the CGP-470, CGP-551, CGP-572, and / or CGP-591 protective films commercially available from Nitto Belgium NV (Genk, Belgium). The temporary protective sheets 116, 118 may include an adhesive layer that allows the temporary protective sheets 116, 118 to adhere to the layer on which they are placed. The adhesive layer may include a hydrophobic material exhibiting a water contact angle of at least 90°. In other examples, temporary protective sheets 116, 118 do not include an adhesive layer and are placed on top of the layer on which they are placed without being bonded to it using an adhesive.

[0042] The first and second temporary protective sheets 116, 118 can be placed on the surface of the substrate 112. The first and / or second temporary protective sheets 116, 118 can be placed on at least a portion of the temporary protective layer 114. The first and second temporary protective sheets 116, 118 may be separately formed plastic sheets placed on the substrate 112. The temporary protective sheets 116, 118 can be placed on the temporary protective layer 114 after the temporary protective layer 114 has cooled to ambient temperature (after it has solidified and formed the temporary protective layer 114).

[0043] To form the protected substrate 100, the first and / or second temporary protective sheets 116, 118 may be placed on the temporary protective layer 114 before the protected substrate 100 is shipped. When the protected substrate 100 reaches its destination, the first and / or second temporary protective sheets 116, 118 can be removed from the protected substrate 100, and as a result, the removal of the temporary protective sheets 116, 118 (e.g., peeling the sheets from the substrate or removal by other means) does not peel off most of the temporary protective layer 114 (>50% by weight of the temporary protective layer 114) from the surface of the substrate 112. The removal of the first and / or second temporary protective sheets 116, 118 may leave substantially all of the temporary protective layer 114 on the surface of the substrate 112 (more than 90% by weight or more than 95% by weight of the temporary protective layer 114). Therefore, the removal of the temporary protective sheets 116 and 118 can leave the temporary protective layer 114 on the surface of the substrate 112 substantially intact.

[0044] The first and second temporary protective sheets 116, 118 can be placed on the substrate 112 in any number of arrangements to form the protected substrate 100. Figures 1-11 show various non-limiting embodiments of the protected substrates 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, and 1100, each of which will be described in more detail below. It will be understood that components in Figures 1-11 whose component numbers have the same last two digits correspond to components in other figures in this application and have the same characteristics as the corresponding components. For example, components 112, 212, 312, 412, 512, etc., all refer to the aforementioned substrates, since all of these component numbers have the same last two digits (12).

[0045] Referring to Figure 1, the temporary protective layer 114 is placed on at least a portion of the surface of the substrate 112. The first and second temporary protective sheets 116, 118 are placed on at least a portion of the surface of the substrate 112 and at least a portion of the temporary protective layer 114. The first and second temporary protective sheets 116, 118 overlap each other to form an overlapping portion. In the example shown in Figure 1, the temporary protective layer 114 is applied to the entire surface of the substrate 112, but in other non-limiting examples, the temporary protective layer 114 may be selectively applied to a smaller portion of the substrate 112 than the entire surface (for example, only on the section where the temporary protective sheets 116, 118 overlap) (see, for example, Figure 7). Below the overlapping portion formed by the first and second temporary protective sheets 116, 118, a gap 120 may be defined between the second temporary protective sheet 118 and a portion of the surface of the substrate 112. This gap 120 may be an air gap and may be free of material from the temporary protective layer 114, the first temporary protective sheet 116, and / or the second temporary protective sheet 118. In this way, the first and second temporary protective sheets 116, 118 are applied on top of the temporary protective layer 114, and the formed gap 120 does not contain material from the temporary protective layer 114, and the temporary protective layer 114, the first temporary protective sheet 116, and / or the second temporary protective sheet 118 do not fill the gap 120 between the first and second temporary protective sheets 116, 118. A portion of the temporary protective layer 114 is positioned between the second temporary protective sheet 118 and a portion of the surface of the substrate 112.

[0046] Referring to Figure 10, the protected substrate 1000 may be identical to the protected substrates 100 and 700 shown in Figures 1 and 7, respectively, except as follows: The protected substrate 1000 may further include a tape 1022. The tape 1022 can hold together the first temporary protective sheet 1016 and the second temporary protective sheet 1018.

[0047] Referring to Figure 2, the protected substrate 200 includes a substrate 212 having a temporary protective layer 214 applied on at least a first portion of the substrate 212. In the example shown in Figure 2, the temporary protective layer 214 is applied to the entire surface of the substrate 212, but in other non-limiting examples, the temporary protective layer 214 may be applied selectively to less than the entire substrate 212 (for example, close to the gap 220 formed between the first and second temporary protective sheets 216, 218) (see, for example, Figure 8). The first temporary protective sheet 216 may be placed on at least a second portion of the substrate 212 and the first portion of the temporary protective layer 214. The second temporary protective sheet 218 may be placed on at least a third portion of the substrate 212 and the second portion of the temporary protective layer 214, and may be spaced apart from the first temporary protective sheet 216 so that the first and second temporary protective sheets 216, 218 do not come into direct contact. The fourth portion of the surface of the substrate 212 is not covered by either of the temporary protective sheets 216, 218. The temporary protective layer 214 is placed on this fourth portion (and may also be applied on the first and / or second portions of the substrate 212). The gap 220 may be formed between the first and second temporary protective sheets 216, 218, directly above the temporary protective layer 214 on the fourth portion.

[0048] Continuing to refer to Figure 2, the protected substrate 200 may include a planar substrate 212 and a first portion thereof to which a temporary protective layer 214 is applied. The substrate 212 may include a second portion to which a first temporary protective sheet 216 is placed. The substrate may include a third portion to which a second temporary protective sheet 218 is applied. The first portion is not covered by the temporary protective sheets 216, 218. The temporary protective layer 214 is placed directly beneath the first and / or second temporary protective sheets 216, 218 and between the substrate 212 and the first and / or second temporary protective sheets 216, 218. The temporary protective sheets 216, 218 may or may not overlap each other.

[0049] Referring to the protected substrate 300 in Figure 3, the substrate 312, the temporary protective layer 314, and the first and second temporary protective sheets 316, 318 may be arranged as described in relation to Figure 2. The protected substrate 300 may further include a tape 322 placed on a third portion of the surface of the substrate 312, a portion of the temporary protective layer 314, a portion of the first temporary protective sheet 316, and / or a portion of the second temporary protective sheet 318. The tape 322 can hold the first temporary protective sheet 316 and the second temporary protective sheet 318 together. A gap 320 may be defined between the portion of the tape 322 placed on the temporary protective layer 314 and the temporary protective layer 314, and between the temporary protective sheets 316, 318. The tape 322 in Figure 3 can also be used in the protected substrate 100 in Figure 1 to hold the first protective sheet 116 and the second protective sheet 118 together. In the example shown in Figure 3, the temporary protective layer 314 is applied to the entire surface of the substrate 312; however, in other non-limiting examples, the temporary protective layer 314 may be selectively applied to a smaller portion of the substrate 312 (for example, only the section under the tape 322) (see, for example, Figure 9).

[0050] Referring to Figure 5, the protected substrate 500 may further include a coating layer 524 positioned between the surface of the substrate 512 and the temporary protective layer 514. Multiple coatings may be positioned on the substrate 512 and under the temporary protective layer 514, so that the temporary protective layer 514 protects the multilayer coatings. The coating layer 524 may include, for example, a low-E coating layer (or other functional coating layers as described above). The coating layer 524 may be suitable for tempering after application to the substrate 512. The coating layer 524 may contain a metal or metal oxide. The coating layer 524 may contain a polymer. The coating layer 524 may include any temperable coating layer, for example, those disclosed in British Patent No. GB2,302,102; U.S. Patents No. 4,504,109; U.S. Patents No. 4,952,423; U.S. Patents No. 5,028,759; U.S. Patents No. 5,059,295; U.S. Patents No. 5,653,903; U.S. Patents No. 7,749,621; U.S. Patents No. 8,865,325; and U.S. Published Patent Application No. 2014 / 0272453. The coating layer 524 may include coatings available commercially from Viro Architectural Glass (Cheswick, Pennsylvania) under the trade names Solarban® or Sungate®. The first and second temporary protective sheets 516, 518 can be placed on the temporary protective layer 514 as described above to form a gap 520. It will be understood that any of the aforementioned embodiments of the protected substrate may include a coating layer (e.g., a functional coating layer) placed between the substrate and the temporary protective layer.

[0051] The present invention also relates to a method for protecting a substrate by forming the aforementioned protected substrate.

[0052] In one non-limiting embodiment, a method for protecting a substrate may include the following steps: providing a substrate including a surface; applying (coating) a material to form a temporary protective layer on at least a first portion of the surface; adhering and / or placing a first temporary protective sheet on a second portion of the surface, wherein a portion of the first temporary protective sheet overlaps with the first portion of the temporary protection; and adhering and / or placing a second temporary protective sheet on a second portion of the temporary protective layer and on a third portion of the surface. An overlap may be formed between the first temporary protective sheet and the second temporary protective sheet, and a gap may be defined by the overlap between the second temporary protective sheet and the surface.

[0053] In one non-limiting embodiment, a method for protecting a substrate may include the following steps: providing a planar substrate including a surface; applying (coating) a material to form a temporary protective layer on at least a first portion of the surface; adhering and / or placing a first temporary protective sheet on a second portion of the surface; and adhering and / or placing a second temporary protective sheet on a third portion of the surface, where a space is formed between the first and second temporary protective sheets. The space may be on the first portion of the surface, and the temporary protective layers may be positioned directly beneath the first and / or second protective sheets and between the substrate and the first and / or second temporary protective sheets.

[0054] The material applied to form a temporary protective layer may be applied to the surface of the substrate by any suitable method, such as spray coating, curtain coating, powder coating, brush coating, roll coating, inkjet printing, or a combination thereof. The material applied to form a temporary protective layer using any of these methods may include any of the aforementioned materials that form a temporary protective layer upon solidification.

[0055] This method may involve heating the material to be applied (coated) to form a temporary protective layer to a temperature sufficient to form a molten liquid before applying (coating) the material to the substrate. In some examples, the material may be applied (coated) to the surface of the substrate at a temperature higher than the melting point of the material. In some examples, the molten liquid may be applied (coated) to the surface of the substrate by bubbling a gas through the molten liquid so that the material forms a temporary protective layer on the substrate (deposition method). The gas bubbling through the molten liquid to deposit the material and form a temporary protective layer may include an inert gas such as nitrogen or helium. The inert gas may reduce the possibility of chemical reactions with the material used to form the temporary protective layer.

[0056] A method for removing a temporary protective layer from a coated substrate may include providing a protected substrate, which includes a planar substrate including a surface; a temporary protective layer disposed on at least a portion of the surface; a first temporary protective sheet disposed on at least a first portion of the surface; and a second temporary protective sheet disposed on at least a second portion of the surface, where the overlapping portion of the second temporary protective sheet overlaps with the overlapping portion of the first temporary protective sheet, where the gap is defined by the overlap between the second temporary protective sheet and the portion of the surface, and a portion of the temporary protective layer is disposed between the second temporary protective sheet and the portion of the surface. The method may include peeling off the first temporary protective sheet and / or the temporary protective sheet. The method may include removing the temporary protective layer from the surface by burning, vaporizing, solvent removal, or peeling off the temporary protective layer to form an unprotected substrate. The protected substrate may be heated to a temperature of up to 1000°C to remove the temporary protective layer from the surface.

[0057] Referring to Figure 11, the protected substrate 1100 may include a substrate 1112, a temporary protective layer 1114 placed on at least a portion of the surface of the substrate 1112, and a flammable sheet 1128 placed on at least a portion of the temporary protective layer 1114, optionally in direct contact with the temporary protective layer 1114. The flammable sheet 1128 may include polyethylene, polypropylene, polyacrylate, polymethyl methacrylate, polylactic acid, polycaprolactone, and polyoxymethylene, or several combinations thereof. The flammable sheet 1128 may optionally include an adhesive. The flammable sheet 1128 may be made of a material that allows at least a portion of UV light to pass through it in order to cure the temporary protective layer 1114 placed beneath it. UV radiation can be applied to the protected substrate 1100 using a UV source, and the UV radiation can cure the temporary protective layer 1114, which can also function as an adhesive for bonding the flammable sheet 1128 to the substrate 1112. Both the temporary protective layer 1114 and the flammable sheet 1128 may burn out during the tempering process. Any of the aforementioned materials can be used for the temporary protective layer 1114, and it may have the aforementioned thickness. The flammable sheet 1128 may have a thickness of 0.1 to 10 mils, such as 0.5 to 5 mils or 0.5 to 2 mils. The flammable sheet 1128 may be the outermost sheet on the substrate 1112. The temporary protective layer 1114 and the flammable sheet 1128 can be made from flammable material. The protected substrate 1100 may include the coating layer 1124 as described above.

[0058] As used in this disclosure, the term “flammable” means a material that burns, vaporizes, or, rather than thermally decomposes, from a substrate without interacting with the substrate or without substantially damaging the aesthetic appearance or performance of the substrate (including any coatings thereon) as defined below. Flammable materials burn, vaporize, or thermally decompose at least when the substrate temperature is between 500°C and 1000°C. It is expected that the flammable material burns, vaporizes, or thermally decomposes before the substrate reaches a temperature of 1000°C, such as 900°C, 800°C, 700°C, 650°C, or 600°C. The heat treatment process can be carried out in a furnace having temperatures up to 1200°C, for example, up to 1100°C, up to 1000°C, up to 900°C, up to 800°C, up to 700°C, or up to 650°C. The furnace can operate at a temperature of 700°C so that the substrate reaches a temperature of 640°C for a burn-off temporary protective layer (described below) that is removed during the heat treatment process. In some non-limiting cases, flammable materials may be removed during standard heat treatment processes such as tempering, heat strengthening, or bending, as described above, or during heat treatments specifically performed to remove flammable materials without adversely affecting the substrate. In some non-limiting examples, flammable materials may be removed during a standard tempering procedure in which the tempering oven operates in the range of 500°C to 1000°C, for example, 600°C to 800°C, or for example, 650°C to 750°C.

[0059] Referring to Figure 4, the protected substrate 400 may include a substrate 412 and a burn-off temporary protective layer 426 placed on at least a portion of the surface of the substrate 412. As shown in Figure 6, the protected substrate 600 may include a substrate 612 and a burn-off temporary protective layer 626 (as in Figure 4) placed on at least a portion of the surface of the substrate 612, and may further include a coating layer 624 between the substrate 612 and the burn-off temporary protective layer 626. As used herein, the term “burn-off temporary protective layer” means a layer that can be removed by a heat treatment process that does not substantially damage the surface.

[0060] The burn-off temporary protective layer 626 may contain wax, polyolefin, polyester, polycarbonate, polyether, or several combinations thereof. The burn-off temporary protective layer 626 may contain polylactic acid (PLA), polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or several combinations thereof. The burn-off temporary protective layer 626 may contain polylactic acid (PLA) and methyl acetate. The burn-off temporary protective layer 626 may optionally contain an adhesive.

[0061] The burn-off temporary protective layer 626 may contain a material having a melting point of 60°C to 350°C.

[0062] The burn-off temporary protective layer 626 may have a thickness of 10 nm to 5000 μm, for example, 1 μm to 100 μm, for example, 5 μm to 50 μm, or for example, 5 μm to 20 μm. The burn-off temporary protective layer 626 may be the outermost layer on the substrate 612.

[0063] The burn-off temporary protective layer 626 can be removed by incineration (or other heat treatment process) without substantially damaging the surface. As used herein, “substantially damaged” is defined as a change detrimental to the function or aesthetics of the substrate that constitutes an undesirable change in substrate properties that renders the substrate unacceptable for its intended purpose. For example, substantially damaging a surface may include substantial discoloration of the surface from a heat treatment process. In other applications where the heating step is part of the standard procedure, damage may be defined as an undesirable color change due to the presence of the burn-off coating compared to a similar sample heated without the burn-off coating. As used herein, substantial discoloration means a color change (DECMC) greater than 3 units, greater than 2 units, or greater than 1 unit compared to the color of a similar substrate treated without the burn-off coating. Unless otherwise specified, “CIELAB” can be measured using an integrating sphere with D65 illumination including specular reflection component, 10° observer, according to ASTM designation: D2244-05. Other examples of substantial damage include, or may be caused by, changes in surface roughness, changes in the oxidation state of the surface, changes in surface energy due to the presence of burn-off coatings during the heat treatment process, or undesirable reactions between the burn-off temporary protective layer and the substrate during the heat treatment process. Substantial damage may include adverse changes to functional coatings placed on a substrate beneath a burn-off temporary protective layer (e.g., antimicrobial functional coatings that no longer disinfect the surface after the heat treatment process, hydrophobic functional coatings that lose their hydrophobicity after the heat treatment process, or changes in the color of functional coatings that are visible to the human eye compared to a substrate heated without a burn-off temporary protective layer (e.g., DECMC > 3, 2, or 1)).

[0064] The burn-off temporary protective layer 626 can be removed by burning at temperatures up to 1000°C, for example, up to 900°C, 800°C, 700°C, 600°C, or 500°C. The burn-off temporary protective layer 626 can be removed during standard heat treatment processes such as tempering, heat strengthening, or bending, or during heat treatments specifically performed to remove flammable material without substantially damaging the substrate 612. As one non-limiting example, the flammable material may be removed during a standard tempering procedure in which the tempering furnace operates in the range of 500°C to 1000°C. The protected substrate 600 may include an optional coating layer 624, as described above.

[0065] Referring again to Figures 4 and 6, the burn-off temporary protective layer can adequately protect the substrate as the outermost layer, so the substrate does not need to have a temporary protective sheet on its surface.

[0066] In some non-limiting examples, the burn-off temporary protective layer may be placed over the entire surface of the substrate. The burn-off temporary protective layer may also cover at least a portion of the edges of the substrate.

[0067] A method for protecting a substrate may include providing a planar substrate including a surface, and applying (coating) a material to form a burn-off temporary protective layer on at least a first portion of the surface. The burn-off temporary protective layer can be applied onto the substrate using any of the aforementioned methods for applying a temporary protective layer. This method may further include preparing a material by dissolving polylactic acid (PLA) in methyl acetate, where the material is applied (coated) to form a burn-off temporary protective layer by curtain coating.

[0068] A method for removing a burn-off temporary protective layer from a coated substrate may include the steps of providing a coated substrate including a surface on which a burn-off temporary protective layer is applied in part, and removing the burn-off temporary protective layer from the surface by burning off the burn-off temporary protective layer to form an unprotected substrate. The coated substrate can be heated to a temperature of up to 1000°C to remove the burn-off temporary protective layer from the surface.

[0069] The following embodiments are presented to demonstrate the general principles of the present invention. The present invention should not be considered to be limited to the specific examples presented. [Examples]

[0070] Example 1 Acrylite coating Acrylite-based clear coating, RUST-OLEUM Crystal Clear Topcoat, product number 248644, was spin-coated at 1250 RPM for 30 seconds onto Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass. The samples were then sealed in an accelerated degradation chamber at 50°C / 100%RH. After 60 hours, the acrylicite coating prevented corrosion of the samples in areas where the uncoated control had severely corroded. Furthermore, a few drops of water were placed on the coated surface of fresh samples, and then the samples were sealed with CGP-551 protective film (Nitto Belgium NV (Genk, Belgium)). After storage at room temperature for 3 days, the samples were heat-treated by rapidly raising the substrate to 600°C and then allowing it to cool to ambient temperature, and compared with the control. The acrylicite coating successfully prevented corrosion in areas where the uncoated control had severely corroded.

[0071] Example 2 Wax coating using smear application (coating) Warm Gulf paraffin wax was applied in 1-inch strips across 4-inch x 4-inch samples of low-E coated Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass. Two thin Nitto CGP-551 protective films (Nitto Belgium NV (Genk, Belgium)) were then manually applied over the wax, ensuring the film seams were above the top of the wax and parallel to it. The samples were then immersed in 40°C water for 2 minutes and left at ambient conditions for 2-3 days. The samples were then heat-treated by rapidly raising the substrate to 600°C and then cooling to ambient temperature, and compared to the control. No corrosion was observed in the waxed samples, while corrosion was seen at the film seams in the control samples without wax. The experiment was repeated for one day using Fisher Scientific's "Refined Carnauba Wax" in an accelerated aging chamber set to 40°C and 95% RH. In this case as well, the wax-coated samples prevented corrosion in areas where the uncoated control was severely corroded.

[0072] Example 3 Tung oil applied using spin coating. Tung oil was spin-coated onto Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass pieces at 1250 RPM for 30 seconds. After application, the oil was oxidized by exposure to a UV light source, resulting in a hardened, opaque coating. Next, the samples were placed in a 60°C / 95%RH humidity accelerated corrosion chamber for 3 days. Finally, the coated samples and uncoated controls were heat-treated and compared by rapidly raising the substrate temperature to 600°C and then cooling to ambient temperature. Tung oil successfully prevented corrosion of the samples in areas where the uncoated controls were severely corroded.

[0073] Example 4 Wax emulsion Emulsions of Fischer-Tropsch wax and carnauba wax from Michelman, and Michem Dispersion 47, D471, ML260, and Cerafak 127N from BYK were applied to Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass. After drying, they were placed in a 60°C / 95%RH humidity accelerated corrosion chamber for 3 days. Next, the samples were heat-treated by rapidly raising the substrate to 600°C and then cooling to ambient temperature, and compared with the control. Both Fischer-Tropsch wax and carnauba wax prevented corrosion of the samples in areas where the uncoated control was severely corroded.

[0074] Example 5 Heat emulsion application (coating) Emulsions of carnauba wax and polyethylene wax from Michelman, and Michem® Dispersion 471, Michem® Guard 1350, ML260, and Aquacer 1031 and Aquacer 8500 from BYK were sprayed onto Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass. After drying, the samples were heated in a 200°C oven for 5 minutes to heat any remaining particles as the emulsion dried, creating a completely melted film. A few drops of water were then placed on top of the samples, and the surface was sealed with Nitto CGP-551 protective film (Nitto Belgium NV (Genk, Belgium)). After 3 days, the samples were heat-treated by rapidly heating the substrates to 600°C and then allowing them to cool to ambient temperature, and compared with controls. Both polyethylene wax and carnauba wax prevented corrosion of the sample in areas where the uncoated control was severely corroded.

[0075] Example 6 wax deposition Microcrystalline wax from “Making Cosmetics” Microcrystalline Wax Pastilles was applied to the surfaces of Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass using a heated bubbler with a nitrogen stream. The resulting wax films changed the water contact angle from approximately 20° on low-E coated glass to over 105° on similar wax-coated samples.

[0076] Example 7 Dip coating application (coating) of molten polyethylene Glass pieces coated with Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coatings were immersion-coated with molten sigma-Aldrich medium-density polyethylene, product number 332119. Samples with thickness gradients ranging from uncoated to very thin and very thick polyethylene coatings were all applied to the same piece. The samples were heat-treated by placing them in an accelerated corrosion chamber at 60°C / 95%RH for 3 days, then rapidly raising the substrate to 600°C and allowing it to cool to ambient temperature. The polyethylene coating successfully prevented corrosion of the samples in areas where the uncoated control was severely corroded. This was true for all sample thicknesses.

[0077] Example 8 Melt spray coating Solarban® 70VT coated glass was spray-coated with Multiwax® 180-M microcrystalline wax from Sonneborn and Sigma Aldrich medium-density polyethylene, product number 332119, using a Valco Melton heated spray unit. The spray pattern covered a band approximately 1 inch wide across the entire substrate. Overspray covered an additional 2-3 inches on each side. The glass was then subjected to accelerated corrosion tests, including a more severe fast test (3 days at 60°C / 95%RH) and a milder, slower test (10 days at 45°C / 95%RH). Under both conditions, the polymer-covered areas were protected from corrosion, and corrosion was reduced even in the oversprayed areas. Glass outside the spray zone was severely corroded. Other polymers with higher melting points, such as polypropylene, can be applied (coated) with other spray systems or contact curtain coaters, provided the environment is adequately heated.

[0078] Example 9 Solution of polyethylene and polypropylene in xylene Blends of Sigma-Aldrich polyethylene, medium density, product number 332119, polyethylene, low density, product number 428043, and blends of amorphous polypropylene, product number 428175, and isotactic polypropylene, average molecular weight 12,000, product number 428116 were dissolved in xylene at high temperature. The resulting solutions were then applied to Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass. The solutions were applied using a drawdown bar, and the resulting samples were placed in an accelerated corrosion chamber at 60°C / 95%RH for 3 days. The polyethylene and polypropylene coatings successfully prevented corrosion of the samples in areas where the uncoated control was severely corroded.

[0079] Example 10 Plant-scale melt spray coating by Nitto Film The glass was sprayed with molten Multiwax® 180-M microcrystalline wax from Sonneborn as it exited the Vitro MSVD coater. The glass was then aligned and Nitto CGP-551 protective film (Nitto Belgium NV (Genk, Belgium)) was applied so that the film seams were parallel to the wax and overlapped the top of the wax. 12-inch x 12-inch samples were collected and subjected to various treatments to induce corrosion. One set was placed in a 95% RH chamber at cycling temperature (25°C to 40°C). This caused water to condense on the sample. The second set was immersed in a 40°C water bath for 2 minutes and then placed in a static 95% RH / 45°C chamber. The third set was passed through a glass washer and then placed in a static 95% RH / 45°C chamber. The last set was not pre-treated before being placed in a static 95% RH / 45°C chamber. In all four cases, the glass with wax under the seams showed less corrosion or no corrosion at all compared to the control with film but no wax.

[0080] Example 11 UV curing coating Several simplified UV-curable coatings were formulated for testing by PPG Industries, Inc. (Pittsburgh, Pennsylvania). The resin was spin-coated onto Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass at 1250 RPM for 30 seconds, cured with a UV light source, and then the samples were placed in a 60°C / 95%RH accelerated corrosion chamber for 3 days. Some of these experimental coatings successfully prevented corrosion in areas where the uncoated control had corroded severely. These coatings burned cleanly when the substrate was heated to 600°C.

[0081] Example 12 Molten coating applied (coated) by a drawdown bar A blend of Sigma-Aldrich polypropylene with an average molecular weight of CA12,000 (product number 440752), amorphous polypropylene (product number 428175), isotatic polypropylene with an average molecular weight of 12,000 (product number 428116), and isotatic polypropylene with an average molecular weight of 250,000 (product number 427888) was melted and then applied (coated) to Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass using a drawdown method. The coating thickness was measured to approximately 50 μm using a stylus profilometer. The samples were then placed in an accelerated corrosion chamber at 60°C / 95%RH for 3 days. The polypropylene coatings successfully prevented corrosion of the samples in areas where the uncoated control was severely corroded. These coatings burned cleanly when the substrate was heated to 600°C.

[0082] Example 13 Hot melt wax Microcrystalline waxes from “Making Cosmetics” Microcrystalline Wax Pastilles, Gulf paraffin wax, beeswax, “Purified Carnauba Wax” from Fischer Scientific, and polymers with a melting point below 130°C, such as Sigma-Aldrich, polyethylene, medium density, product number 332119, were melted and applied (coated) to glass using a drawdown bar. The resulting coatings burned cleanly off Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass, providing excellent protection against corrosion.

[0083] Example 14 wax in solvent Microcrystalline waxes from “Making Cosmetics” Microcrystalline Wax Pastilles, Gulf paraffin wax, beeswax, “Purified Carnauba Wax” from Fischer Scientific, and polymers with a melting point below 130°C, such as Sigma-Aldrich, polyethylene, medium density, product number 332119, were dissolved in various solvents including xylene, toluene, methyl ethyl ketone, methyl acetate, ethyl acetate, isopropanol, and dichloroethane. The resulting solutions were applied (coated) to substrates via a drawdown bar. The resulting coatings burned cleanly off Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass, exhibiting excellent corrosion resistance.

[0084] Example 15 Polypropylene in a solvent Low-viscosity solutions were prepared by dissolving polypropylene (PPL) in solvents such as xylene. Coatings obtained by application using a drawdown bar burned cleanly off Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass. Stereoregularity of the polymer chains resulted in differences in solubility and the final coating. Amorphous PPL formed a continuous, sticky coating. Isotactic polypropylene also formed a continuous coating, but it was brittle and prone to cracking. By dissolving PPL in solvents, various types could be blended in different ratios and applied using a drawdown bar to create coatings with varying levels of stickiness and brittleness. These coatings burned cleanly off Solarban® products. A higher proportion of atactic PPL in the blend resulted in greater flexibility and improved protection against cracking. This, to some extent, meant enhanced corrosion protection and mechanical strength. Too much amorphous PPL will make the coating sticky and soft. The optimal blend was tested for resistance to damage during transport, mechanical damage, and corrosion. Other solvents that can be tried include methyl tert-butyl ether, tert-butyl acetate, benzene, toluene, xylene, dimethyl carbonate, and methyl ethyl ketone.

[0085] Example 16 Polypropylene with various molecular weights Polypropylene can be supplied in many different molecular weights. In the case of isotactic polypropylene, the higher the molecular weight, the lower the solubility. A 10% solution of 250,000 MW PPL did not dissolve in xylene, but a 10% solution of 12,000 MW PPL did dissolve, resulting in a low-viscosity solution suitable for drawdown coating.

[0086] Example 17 Polypropylene Carbonate QPAC40 Polypropylene Carbonate (PPC) (Empower Materials (New) Castle (manufactured in DE) cleanly burned off Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass. Various grades of PPC with different molecular weights were dissolved in methyl acetate to form 17% to 38% PPC solutions. The viscosity of the solution at 17% varied from 110 to 1040 cp. The solution was then applied (coated) to form coatings with thicknesses ranging from 6 μm to 20 μm. The coatings exhibited excellent mechanical strength and cleanly burned off Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass. Other solvents that can be used include methyl tert-butyl ether, tert-butyl acetate, benzene, toluene, xylene, dimethyl carbonate, and methyl ethyl ketone. Other similar polymers such as polyethylene carbonate (e.g., QPAC25 (Empower Materials (New Castle, DE))) may also provide a flammable coating with good mechanical strength.

[0087] Example 18 Different grades of polylactic acid Natureworks polylactic acid (PLA) was dissolved in a solvent to create a fluid, which was then applied (coated) to Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass using various application methods such as drawdown, spin coating, curtain coating, flow coating, and dip coating. The resulting PLA coating burned off cleanly from Solarban® 60VT, Solarban® 70VT, Solarban® R100, and other Solarban® coated glass. Different types of PLA in various Solarban® products have varying maximum thicknesses, as determined by the visible residue after burning. Furthermore, some Solarban® coatings are often more sensitive to residue due to their unique optical properties. Different types of PLA also have different solubility. For example, the maximum solubility of NATUREWORKS 2003D was 33% with methyl acetate, while the maximum solubility of NATUREWORKS 2500HP was 8% with methyl acetate. Different grades result in different viscosities in solution, which can affect the application method.

[0088] Example 19 Polylactic acid in various solvents Polylactic acid (PLA) was dissolved in various solvents, including acetone, methyl acetate, xylene, and methylene chloride. Different solvents imparted different properties to the resulting coatings. Dissolving PLA in acetone resulted in coatings with inferior mechanical and aesthetic properties compared to coatings made with similar grades of PLA dissolved in methyl acetate. Other solvents that can be used include methyl tert-butyl ether, tert-butyl acetate, benzene, toluene, dimethyl carbonate, and methyl ethyl ketone.

[0089] Example 20 Polylactic acid coating applied (coated) by the drawdown method The PLA solution was applied (coated) to the glass substrate using a drawdown bar. This contact application method allowed for uniform coatings with thicknesses ranging from 1 μm to 40 μm. Substrates included clear glass, colored glass, low-iron glass, Solarban® 60 coated glass, Solarban® 70 coated glass, Solarban® 90 coated glass, Solarban® R100 coated glass, and Solarban® 67 coated glass. Furthermore, experimental samples were prepared with various topcoats, including silicon nitride, silicon alumina nitride, silicon alumina oxide, and silicon aluminum oxynitride. The various substrates and PLA types had a maximum allowable thickness determined by the absence of visible residue after combustion. The resulting coatings exhibited excellent mechanical strength and superior protection against damage during transport.

[0090] Example 21 Polylactic acid coating by curtain coating A PLA solution was applied (coated) to a glass substrate using a slot die applicator (NordsonEDI, Ultracoat® IV). The PLA solution was 12% methyl acetate and was pumped through a 1400 mm slot die with lip openings ranging from 5 μm to 250 μm. The die was lifted 3 inches above the glass surface, and the glass moved under a curtain at a speed of 80 inches / second. The resulting coating was approximately 9 μm thick and burned cleanly on Solarban® 60, clear glass, and Solarban® R100. The curtain coating method improved coating adhesion compared to drawdown application, and the resulting coating exhibited superior mechanical strength and excellent protection against damage during transport.

[0091] Example 22 Oil in polylactic acid To enhance the corrosion resistance of polylactic acid, various oils such as cottonseed oil, soybean oil, corn oil, rapeseed oil, linseed oil, castor oil, sesame oil, lard, and olive oil, as well as waxes such as carnauba oil and medium-density polyethylene, were added to PLA in a solution at 10% by weight of the PLA, and then applied (coated) to Solarban® products. All of these oils help prevent corrosion of Solarban® products without significantly degrading the PLA coating. Waxes in the form of emulsions or other application techniques that can form a more uniform coating also help enhance the corrosion resistance of PLA.

[0092] Example 23 Additives that reduce the mobility of molten polylactic acid Polylactic acid (PLA) is a thermoplastic, meaning it can bead up or aggregate on the glass surface before burning. Using UV-curing additives to trap the PLA in place reduces its movement on the surface. This reduced mobility can be used to allow for the placement of thicker layers of PLA. Other UV-curing additives and thermosetting resins can be used to restrict movement in the same way.

[0093] The present invention further includes the subject matter of the following sections.

[0094] Item 1: Protected substrate, comprising a planar substrate including a surface; a temporary protective layer disposed on at least a portion of the surface; a first temporary protective sheet disposed on at least a first portion of the surface; and a second temporary protective sheet disposed on at least a second portion of the surface, wherein the overlapping portion of the second temporary protective sheet overlaps with the overlapping portion of the first temporary protective sheet; the gap is defined by the overlap between the second temporary protective sheet and the portion of the surface, and a portion of the temporary protective layer is disposed between the second temporary protective sheet and the portion of the surface.

[0095] Item 2: The protected substrate of Item 1, wherein the temporary protective layer is removable by combustion, vaporization, removal using a solvent, or peeling.

[0096] Item 3: A protected substrate according to item 1 or 2, wherein the planar substrate includes glass.

[0097] Item 4: A protected substrate according to any of items 1-3, wherein the planar substrate includes metal or wood.

[0098] Item 5: A protected substrate according to any of items 1 to 4, further comprising a functional coating disposed on the surface and between the surface and a temporary protective layer.

[0099] Item 6: Protected substrate of Item 5, where the functional coating includes a low E coating layer.

[0100] Item 7: A protected substrate according to any of Items 1 to 6, wherein the temporary protective layer comprises a material including wax, polyolefin, poly(meth)acrylate, polyester, alkene, or some combination thereof.

[0101] Item 8: Protected substrate according to Item 7, wherein the wax contains polyethylene wax.

[0102] Item 9: A protected substrate according to any of items 1-8, comprising a temporary protective layer with a thickness of at least 10 nm and a maximum of 5000 μm.

[0103] Item 10: A protected substrate according to any of Items 1-9, wherein the first temporary protective sheet and / or the second temporary protective sheet are configured to be removed from the protected substrate, and the removal of the first temporary protective sheet and / or the second temporary protective sheet from the protected substrate does not peel off a large portion of the temporary protective layer from the surface.

[0104] Item 11: A protected substrate according to any of items 1 to 10, wherein the temporary protective layer comprises a material having a melting point of at least 60°C.

[0105] Item 12: A protected substrate according to any of items 1 to 11, wherein the temporary protective layer contains a hydrophobic material.

[0106] Item 13: A protected substrate according to any of items 1 to 12, wherein when the temporary protective layer comes into contact with water, the temporary protective layer exhibits a water contact angle of at least 60°.

[0107] Item 14: A protected substrate according to any of items 1 to 13, wherein the temporary protective layer is water-impermeable.

[0108] Item 15: A protected substrate according to any of Items 1 to 14, wherein the temporary protective layer provides increased corrosion protection to the substrate compared to the same substrate without the temporary protective layer.

[0109] Item 16: A protected substrate according to any of items 1 to 15, further comprising a tape placed between a first temporary protective sheet and a second temporary protective sheet.

[0110] Item 17: Protected substrate, comprising: a planar substrate including a surface; a first temporary protective sheet placed on a first portion of the surface; a second temporary protective sheet placed on a second portion of the surface, wherein a third portion of the surface is not covered by the first temporary protective sheet and the third portion of the surface is not covered by the second temporary protective sheet; and a temporary protective layer on at least the third portion of the surface, wherein the temporary protective layer is placed directly beneath the first and / or second protective sheets and between the substrate and the first and / or second temporary protective sheets.

[0111] Item 18: The protected substrate of Item 17, further comprising a tape placed on at least a third portion of the surface, a portion of the first temporary protective sheet, and a portion of the second temporary protective sheet.

[0112] Item 19: The protected substrate of Item 18, wherein a portion of the tape is placed on at least a portion of the temporary protective layer.

[0113] Item 20: The protected substrate of Item 19, wherein a gap is defined between the portion of the tape placed on the portion of the temporary protective layer and the portion of the temporary protective layer.

[0114] Item 21: A protected substrate according to any of items 17-20, wherein the temporary protective layer is removable by combustion, vaporization, solvent removal, or peeling.

[0115] Item 22: A protected substrate according to any of items 17-21, wherein the planar substrate includes glass.

[0116] Item 23: A protected substrate according to any of items 17-22, wherein the planar substrate includes metal or wood.

[0117] Item 24: A protected substrate according to any of items 17 to 23, further comprising a functional coating disposed on the surface and between the surface and a temporary protective layer.

[0118] Item 25: Protected substrate according to Item 24, wherein the functional coating includes a low-E coating.

[0119] Item 26: A protected substrate according to any of Items 17-25, wherein the temporary protective layer comprises a material including wax, polyolefin, poly(meth)acrylate, polyester, alkene, or some combination thereof.

[0120] Item 27: Protected substrate according to Item 26, wherein the wax contains polyethylene wax.

[0121] Item 28: A protected substrate according to any of items 17-27, wherein the temporary protective layer has a thickness of at least 10 nm and a maximum of 5000 μm.

[0122] Item 29: A protected substrate according to any of Items 17-28, wherein the first temporary protective sheet and / or the second temporary protective sheet are configured to be removed from the protected substrate, and the removal of the first temporary protective sheet and / or the second temporary protective sheet from the protected substrate does not peel off a large portion of the temporary protective layer from the surface.

[0123] Item 30: A protected substrate according to any of items 17 to 29, wherein the temporary protective layer comprises a material having a melting point of at least 60°C.

[0124] Item 31: A protected substrate according to any of items 17-30, wherein the temporary protective layer contains a hydrophobic material.

[0125] Item 32: A protected substrate according to any of items 17 to 31, wherein when the temporary protective layer comes into contact with water, the temporary protective layer exhibits a water contact angle of at least 60°.

[0126] Item 33: A protected substrate according to any of items 17-32, wherein the temporary protective layer is water-impermeable.

[0127] Item 34: A protected substrate according to any of Items 17-33, wherein the temporary protective layer provides increased corrosion protection to the substrate compared to the same substrate without the temporary protective layer.

[0128] Item 35: Protected substrate, a planar substrate including a surface; a first portion of the surface to which a temporary protective layer is applied; a second portion of the surface to which a first temporary protective sheet is placed; and a third portion of the surface to which a second temporary protective sheet is placed, wherein the first portion is not covered by the first or second temporary protective sheet, the temporary protective layer is placed directly beneath the first and / or second protective sheet, and is placed between the substrate and the first and / or second temporary protective sheet, with the first temporary protective sheet overlapping or not overlapping the second temporary protective sheet.

[0129] Item 36: The protected substrate of Item 35, further comprising a tape placed on at least a first portion of the surface, a portion of a first temporary protective sheet, and a portion of a second temporary protective sheet.

[0130] Item 37: The protected substrate of item 36, wherein a portion of the tape is placed on at least a portion of the temporary protective layer.

[0131] Item 38: The protected substrate of Item 37, wherein a gap is defined between the portion of the tape placed on the portion of the temporary protective layer and the portion of the temporary protective layer.

[0132] Item 39: A protected substrate according to any of items 35-38, wherein the temporary protective layer is removable by combustion, vaporization, solvent removal, or peeling.

[0133] Item 40: A protected substrate according to any of items 35-39, in which the planar substrate includes glass.

[0134] Item 41: A protected substrate according to any of items 35-40, wherein the planar substrate includes metal or wood.

[0135] Item 42: A protected substrate according to any of items 35 to 41, further comprising a functional coating disposed on the surface and between the surface and a temporary protective layer.

[0136] Item 43: Protected substrate according to Item 42, wherein the functional coating includes a low-E coating.

[0137] Item 44: A protected substrate according to any of Items 35-43, wherein the temporary protective layer comprises a material including wax, polyolefin, poly(meth)acrylate, polyester, alkene, or some combination thereof.

[0138] Item 45: Protected substrate of item 44, wherein the wax contains polyethylene wax.

[0139] Item 46: A protected substrate according to any of items 35-45, wherein the temporary protective layer has a thickness of at least 10 nm and a maximum of 5000 μm.

[0140] Item 47: A protected substrate according to any of items 35-46, wherein the first temporary protective sheet and / or the second temporary protective sheet are configured to be removed from the protected substrate, and the removal of the first temporary protective sheet and / or the second temporary protective sheet from the protected substrate does not peel off a large portion of the temporary protective layer from the surface.

[0141] Item 48: A protected substrate according to any of items 35 to 47, wherein the temporary protective layer comprises a material having a melting point of at least 60°C.

[0142] Item 49: A protected substrate according to any of items 35-48, wherein the temporary protective layer contains a hydrophobic material.

[0143] Item 50: A protected substrate according to any of items 35-49, wherein when the temporary protective layer comes into contact with water, the temporary protective layer exhibits a water contact angle of at least 60°.

[0144] Item 51: A protected substrate according to any of items 35-50, wherein the temporary protective layer is water-impermeable.

[0145] Item 52: A protected substrate according to any of items 35-51, wherein the temporary protective layer provides increased corrosion protection to the substrate compared to the same substrate without the temporary protective layer.

[0146] Item 53: A method for protecting a substrate, comprising the steps of: providing a planar substrate including a surface; applying (coating) a material to form a temporary protective layer on at least a first portion of the surface; adhering a first temporary protective sheet onto a second portion of the surface, wherein a portion of the first temporary protective sheet overlaps with a first portion of the temporary protective layer; and adhering a second temporary protective sheet onto a second portion of the temporary protective layer and a third portion of the surface, wherein an overlap is formed between the first temporary protective sheet and the second temporary protective sheet, and the gap is defined by the overlap between the second temporary protective sheet and the surface.

[0147] Item 54: The method according to Item 53, wherein the material is applied (coated) onto at least a first portion of a surface by spray coating, curtain coating, powder coating, brush coating, roll coating, inkjet printing, or a combination thereof.

[0148] Item 55: The method according to item 53 or 54, wherein the material is an emulsion comprising a hydrophobic material, water, and a surfactant.

[0149] Item 56: The method according to item 55, wherein the surfactant is nonionic.

[0150] Item 57: Any method of items 53 to 56, further comprising heating the material to a certain temperature to form a molten liquid before applying (coating) the material.

[0151] Item 58: The method according to item 57, wherein the material is a thermoplastic or thermosetting resin.

[0152] Item 59: The method according to item 57 or 58, wherein the material is applied (coated) to a first portion of the surface at a temperature above the melting point of the material.

[0153] Item 60: Any method of items 57-59, wherein the molten liquid is applied (coated) to a first portion of the surface by bubbling a gas into the molten liquid.

[0154] Item 61: The method according to item 60, wherein the gas includes an inert gas.

[0155] Item 62: Any method of items 53 to 61, wherein the material comprises a hydrophobic material dissolved in a solvent.

[0156] Item 63: Any method of items 53 to 62, wherein the material comprises a UV-curable or thermosetting material, and the applied (coated) material is crosslinked by exposure to a UV source or heat.

[0157] Item 64: Any method of items 53 to 63, wherein the material comprises a two-component resin, and the components of the resin react to crosslink the resin when the material is applied (coated).

[0158] Item 65: Any method of items 53 to 64, further comprising removal of a temporary protective layer by combustion, vaporization, removal using a solvent, or peeling.

[0159] Item 66: Any method according to items 53 to 65, wherein the planar substrate includes glass.

[0160] Item 67: Any method according to items 53 to 66, wherein the planar substrate includes metal or wood.

[0161] Item 68: Any method of items 53 to 67, wherein a planar substrate includes a functional coating disposed on the surface and between the surface and a temporary protective layer.

[0162] Item 69: The method according to Item 68, wherein the functional coating includes a low-E coating.

[0163] Item 70: Any method of items 53 to 69, wherein the temporary protective layer comprises a material comprising wax, polyolefin, poly(meth)acrylate, polyester, alkene, or a combination thereof.

[0164] Item 71: The method according to item 70, wherein the wax comprises polyethylene wax.

[0165] Item 72: Any method according to items 53 to 71, wherein the material is applied (coated) such that the formed temporary protective layer has a thickness of at least 10 nm and a maximum of 5000 μm.

[0166] Item 73: A method, one of items 53 to 72, wherein the first temporary protective sheet and / or the second temporary protective sheet are configured to be removed from the protected substrate, and the removal of the first temporary protective sheet and / or the second temporary protective sheet from the protected substrate does not peel off a large portion of the temporary protective layer from the surface.

[0167] Item 74: Any method according to items 53 to 73, wherein the material has a melting point of at least 60°C.

[0168] Item 75: Any method from items 53 to 74, wherein the material includes a hydrophobic material.

[0169] Item 76: Any method of items 53-75, wherein the temporary protective layer is water-impermeable.

[0170] Item 77: Any method of items 53 to 76, wherein the temporary protective layer provides increased corrosion protection to the substrate compared to the same substrate without the temporary protective layer.

[0171] Item 78: Any method of items 53 to 77, further comprising applying tape over a portion of the first temporary protective sheet and the second temporary protective sheet.

[0172] Item 79: A method for protecting a substrate, comprising the steps of: providing a planar substrate including a surface; applying (coating) a material to form a temporary protective layer on at least a first portion of the surface; adhering a first temporary protective sheet on a second portion of the surface; and adhering a second temporary protective sheet on a third portion of the surface, wherein a space is formed between the first temporary protective sheet and the second temporary protective sheet, the space is above the first portion of the surface, the temporary protective layer is positioned directly beneath the first and / or second protective sheet, and is positioned between the substrate and the first and / or second temporary protective sheet.

[0173] Item 80: The method according to Item 79, further comprising applying tape on a first portion of a surface, on a portion of a first temporary protective sheet, and on a portion of a second temporary protective sheet.

[0174] Item 81: The method according to item 80, wherein the tape is placed on top of a temporary protective layer.

[0175] Item 82: The method according to item 81, wherein a gap is defined between a portion of the tape and a portion of the temporary protective layer.

[0176] Item 83: Any method of items 79 to 82, wherein the material is applied (coated) onto at least a first portion of a surface by spray coating, curtain coating, powder coating, brush coating, roll coating, inkjet printing or a combination thereof.

[0177] Item 84: Any method according to items 79-83, wherein the material is an emulsion comprising a hydrophobic material, water, and a surfactant.

[0178] Item 85: The method according to item 84, wherein the surfactant is nonionic.

[0179] Item 86: Any method of items 79 to 85, further comprising heating the material to a certain temperature to form a molten liquid before applying (coating) the material.

[0180] Item 87: The method according to item 86, wherein the material is a thermoplastic or thermosetting resin.

[0181] Item 88: The method according to Item 86 or 87, wherein the material is applied (coated) to a first portion of the surface at a temperature above the melting point of the material.

[0182] Item 89: Any method of items 86-88, wherein a molten liquid is applied (coated) to a first portion of a surface by bubbling a gas through the molten liquid.

[0183] Item 90: The method according to item 89, wherein the gas includes an inert gas.

[0184] Item 91: Any method of items 79 to 90, comprising a hydrophobic material in which the material is dissolved in a solvent.

[0185] Item 92: Any method according to items 79 to 91, wherein the material comprises a UV-curable or thermosetting material, and the applied (coated) material is crosslinked by exposure to a UV source or heat.

[0186] Item 93: Any method described in items 79 to 92, wherein the material comprises a two-component resin, and the components of the resin react to crosslink the resin when the material is applied (coated).

[0187] Item 94: Any method of items 79 to 93, further comprising removal of a temporary protective layer by combustion, vaporization, removal using a solvent, or peeling.

[0188] Item 95: Any method of items 79-94, wherein the planar substrate includes glass.

[0189] Item 96: Any method according to items 79 to 95, wherein the planar substrate includes metal or wood.

[0190] Item 97: Any method of items 79 to 96, wherein a planar substrate includes a functional coating disposed on the surface and between the surface and a temporary protective layer.

[0191] Item 98: The method according to Item 97, wherein the functional coating includes a low-E coating.

[0192] Item 99: Any method of items 79 to 98, wherein the temporary protective layer comprises a material comprising wax, polyolefin, poly(meth)acrylate, polyester, alkene, or some combination thereof.

[0193] Item 100: The method according to item 99, wherein the wax comprises polyethylene wax.

[0194] Item 101: Any method of items 79 to 100, wherein the material is applied (coated) such that the formed temporary protective layer has a thickness of at least 10 nm and a maximum of 5000 μm.

[0195] Item 102: A method, one of items 79-101, wherein the first temporary protective sheet and / or the second temporary protective sheet are configured to be removed from the protected substrate, and the removal of the first temporary protective sheet and / or the second temporary protective sheet from the protected substrate does not peel off a large portion of the temporary protective layer from the surface.

[0196] Item 103: Any method according to items 79 to 102, wherein the material has a melting point of at least 60°C.

[0197] Item 104: Any method described in items 79 to 103, wherein the material includes a hydrophobic material.

[0198] Item 105: Any method of items 79-104, wherein the temporary protective layer is water-impermeable.

[0199] Item 106: Any method of items 79 to 105, wherein the temporary protective layer provides increased corrosion protection to the substrate compared to the same substrate without the temporary protective layer.

[0200] Item 107: A planar substrate including a surface; and a protected substrate including a temporary protective layer disposed on at least a portion of the surface, wherein the temporary protective layer comprises wax, polyolefin, poly(meth)acrylate, polyester, alkene, polyethylene, polypropylene, polyacrylate, polymethyl methacrylate, polylactic acid, polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, or some combination thereof.

[0201] Item 108: A protected substrate according to Item 107, wherein the temporary protective layer has a thickness of at least 10 nm and a maximum of 5000 μm.

[0202] Item 109: Protected substrates of item 107 or 108, wherein the planar substrate includes glass.

[0203] Item 110: A protected substrate according to any of items 107-109, wherein the planar substrate includes metal or wood.

[0204] Item 111: A protected substrate according to any of items 107 to 110, wherein the temporary protective layer comprises an alkane, ester, or carboxylic acid having at least 40% by weight of carbon.

[0205] Item 112: A protected substrate is any protected substrate as defined in items 107-111, which does not include a temporary protective sheet placed on the surface.

[0206] Item 113: A protected substrate according to any of items 107-112, wherein the temporary protective layer is the outermost layer of the planar substrate.

[0207] Item 114: A protected substrate according to any of items 107-113, wherein a temporary protective layer is provided over at least the entire surface.

[0208] Item 115: A planar substrate including a surface; and a protected substrate including a burn-off temporary protective layer disposed on at least a portion of the surface, wherein the burn-off temporary protective layer comprises wax, polyolefin, polyester, polycarbonate, polyether, or several combinations thereof, and the burn-off temporary protective layer is removable by a heat treatment process that does not cause substantial damage to the surface.

[0209] Item 116: A protected substrate according to Item 115, wherein the burn-off temporary protective layer comprises polylactic acid (PLA), polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or some combination thereof.

[0210] Item 117: A protected substrate according to Item 115 or 116, comprising a burn-off temporary protective layer with a thickness of at least 10 nm and a maximum of 5000 μm.

[0211] Item 118: A protected substrate according to any of items 115-117, wherein the planar substrate includes glass.

[0212] Item 119: A protected substrate is any protected substrate as defined in items 115 through 118, which does not include a temporary protective sheet placed on the surface.

[0213] Item 120: A protected substrate according to any of items 115-119, wherein the burn-off temporary protective layer is the outermost layer of the planar substrate.

[0214] Item 121: A protected substrate according to any of items 115-120, wherein a burn-off temporary protective layer is placed over the entire surface and at least a portion of the edges of the substrate.

[0215] Item 122: Burn-off temporary protective layer can be removed by burning at a maximum temperature of 1000°C on any protected substrate according to items 115-121.

[0216] Item 123: A protected substrate according to any of Items 115-122, wherein the combustion of the heat treatment process includes burning off a temporary protective layer without causing substantial damage to the surface.

[0217] Item 124: A protected substrate according to any of items 115-123, wherein the heat treatment process does not result in a color change (DECMC) of more than 3 units on the surface compared to the surface color before the heat treatment process.

[0218] Item 125: A protected substrate according to any of items 115-124, further comprising a functional coating placed between the surface and a burn-off temporary protective layer.

[0219] Item 126: Protected substrate of Item 125, wherein the functional coating includes a low-E coating layer.

[0220] Item 127: A protected substrate according to any of items 115 to 126, wherein the burn-off temporary protective layer comprises a material having a melting point of at least 60°C and a maximum of 350°C.

[0221] Item 128: A protected substrate according to any of items 115-127, wherein the burn-off temporary protective layer comprises polylactic acid (PLA) and methyl acetate.

[0222] Item 129: A method for protecting a substrate, comprising the steps of: providing a planar substrate including a surface; and applying (coating) a material to form a burn-off temporary protective layer on at least a first portion of the surface, wherein the burn-off temporary protective layer comprises wax, polyolefin, polyester, polycarbonate, polyether, or several combinations thereof, and the burn-off temporary protective layer is removable by a heat treatment process that does not substantially damage the surface.

[0223] Item 130: The method according to Item 129, wherein the burn-off temporary protective layer comprises polylactic acid (PLA), polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or some combination thereof.

[0224] Item 131: The method of item 129 or 130, wherein the planar substrate includes glass.

[0225] Item 132: The method of Item 130 or 131, further comprising preparing a material by dissolving polylactic acid (PLA) in methyl acetate, wherein the material is applied (coated) to form a burn-off temporary protective layer by curtain coating.

[0226] Item 133: A method for removing a burn-off temporary protective layer from a coated substrate, comprising the steps of: providing a coated substrate including a surface on which a burn-off temporary protective layer is applied in part; wherein the burn-off temporary protective layer includes wax, polyolefin, polyester, polycarbonate, polyether, or several combinations thereof; and removing the burn-off temporary protective layer from the surface by burning the burn-off temporary protective layer to form an unprotected substrate without substantially damaging the surface.

[0227] Item 134: The method according to Item 133, wherein the burn-off temporary protective layer comprises polylactic acid (PLA), polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or some combination thereof.

[0228] Item 135: The method of item 133 or 134, wherein the coated substrate includes coated glass.

[0229] Item 136: Any method of items 133-135, wherein the coated substrate is heated to a temperature of up to 1000°C to remove the burn-off temporary protective layer from the surface.

[0230] Item 137: Protected substrate comprising: a planar substrate including a surface; a temporary protective layer disposed on at least a portion of the surface; a first temporary protective sheet disposed on at least a first portion of the surface; and a second temporary protective sheet disposed on at least a second portion of the surface, wherein the overlapping portions of the second temporary protective sheet overlap with the overlapping portions of the first temporary protective sheet, the gap is defined by the overlap between the second temporary protective sheet and the portion of the surface, and the portion of the temporary protective layer is disposed between the second temporary protective sheet and the portion of the surface.

[0231] Item 138: The protected substrate of Item 137, wherein the temporary protective layer is removable by combustion, vaporization, removal using a solvent, or peeling.

[0232] Item 139: Protected substrates of item 137 or 138, wherein the planar substrate includes glass.

[0233] Item 140: A protected substrate according to any of items 137-139, further comprising a functional coating disposed on the surface and between the surface and a temporary protective layer.

[0234] Item 141: Protected substrate of Item 140, wherein the functional coating includes a low-E coating layer.

[0235] Item 142: A protected substrate according to any of Items 137-141, wherein the temporary protective layer comprises a material including wax, organic oil, polyolefin, poly(meth)acrylate, polyester, alkene, polyethylene, polypropylene, or some combination thereof.

[0236] Item 143: A protected substrate according to Item 142, wherein the temporary protective layer comprises polylactic acid (PLA), polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or some combination thereof.

[0237] Item 144: A protected substrate according to any of items 137-143, wherein the first temporary protective sheet and / or the second temporary protective sheet are configured to be removed from the protected substrate, and the removal of the first temporary protective sheet and / or the second temporary protective sheet from the protected substrate does not peel off most of the temporary protective layer from the surface.

[0238] Item 145: A protected substrate according to any of items 137 to 144, wherein the temporary protective layer comprises a material having a melting point of at least 60°C and a maximum of 350°C.

[0239] Item 146: A protected substrate according to any of items 137-145, wherein when the temporary protective layer comes into contact with water, the temporary protective layer exhibits a water contact angle of at least 60°.

[0240] Item 147: Protected substrate, comprising: a planar substrate including a surface; a first temporary protective sheet placed on a first portion of the surface; a second temporary protective sheet placed on a second portion of the surface, wherein a third portion of the surface is not covered by the first temporary protective sheet and the third portion of the surface is not covered by the second temporary protective sheet; and a temporary protective layer on at least the third portion of the surface, wherein the temporary protective layer is placed directly beneath the first and / or second protective sheets and between the substrate and the first and / or second temporary protective sheets.

[0241] Item 148: The protected substrate of Item 147, further comprising a tape placed on at least a third portion of the surface, a portion of the first temporary protective sheet, and a portion of the second temporary protective sheet.

[0242] Item 149: A protected substrate according to Item 147 or 148, wherein the temporary protective layer is removable by combustion, vaporization, removal using a solvent, or peeling.

[0243] Item 150: A protected substrate according to any of items 147-149, wherein the planar substrate includes glass.

[0244] Item 151: A protected substrate according to any of items 147-150, further comprising a coating placed between the surface and a temporary protective layer.

[0245] Item 152: Protected substrate according to Item 151, with a coating including a low-E coating.

[0246] Item 153: A protected substrate according to any of Items 147-152, wherein the temporary protective layer comprises a material including wax, organic oil, polyolefin, poly(meth)acrylate, polyester, alkene, or some combination thereof.

[0247] Item 154: A protected substrate according to any of items 147 to 153, wherein the temporary protective layer comprises a material having a melting point of at least 60°C and a maximum of 350°C.

[0248] Section 155: A method for protecting a substrate, comprising the following steps: providing a planar substrate including a surface; applying (coating) a material to form a temporary protective layer on at least a first portion of the surface, adhering a first temporary protective sheet onto a second portion of the surface, wherein a portion of the first temporary protective sheet overlaps with the first portion of the temporary protective layer; and adhering a second temporary protective sheet onto the second portion of the temporary protective layer and onto a third portion of the surface, wherein an overlap is formed between the first temporary protective sheet and the second temporary protective sheet, and the gap is defined by the overlap between the second temporary protective sheet and the surface.

[0249] Item 156: A method for removing a temporary protective layer from a coated substrate, comprising the steps of: providing a protected substrate, the protected substrate comprising a planar substrate including a surface; a temporary protective layer disposed on at least a portion of the surface; a first temporary protective sheet disposed on at least a first portion of the surface; and a second temporary protective sheet disposed on at least a second portion of the surface, wherein the overlapping portion of the second temporary protective sheet overlaps with the overlapping portion of the first temporary protective sheet by overlap; where the gap is defined by the overlap between the second temporary protective sheet and the portion of the surface, and the portion of the temporary protective layer is disposed between the second temporary protective sheet and the portion of the surface; peeling off the first temporary protective sheet and / or the temporary protective sheet; and removing the temporary protective layer from the surface by burning, vaporizing, solvent-based removal, or peeling off the temporary protective layer to form an unprotected substrate.

[0250] Item 157: The method according to item 156, wherein the protected substrate is heated to a temperature of up to 1000°C to remove the temporary protective layer from the surface.

[0251] Item 158: A planar substrate including a surface; and a protected substrate including a burn-off temporary protective layer disposed on at least a portion of the surface, wherein the burn-off temporary protective layer comprises wax, polyolefin, polyester, polycarbonate, polyether, or several combinations thereof, and the burn-off temporary protective layer is removable by a heat treatment process that does not cause substantial damage to the surface.

[0252] Item 159: A protected substrate according to Item 158, wherein the burn-off temporary protective layer includes a protective film.

[0253] While the present invention has been described in detail for illustrative purposes based on what is currently considered to be the most practical and preferred embodiment, it should be understood that such details are for that purpose only, and the present invention is not limited to the disclosed embodiments, but rather intended to cover modifications and equivalent arrangements within the spirit and scope of the appended claims. For example, it should be understood that, where possible, the present invention intends that one or more features of any embodiment can be combined with one or more features of any other embodiment.

Claims

1. Planar substrates including surfaces; and A burn-off temporary protective layer placed on at least a portion of the surface. A protected substrate including, The burn-off temporary protective layer contains wax, polyolefin, polyester, polycarbonate, polyether, or some combination thereof. The burn-off temporary protective layer is removable by a heat treatment process that does not substantially damage the surface of the protected substrate.

2. The protected substrate according to claim 1 or 2, wherein the burn-off temporary protective layer comprises polylactic acid (PLA), polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or several combinations thereof.

3. A protected substrate according to any one of claims 1 to 2, wherein the burn-off temporary protective layer includes a thickness of at least 10 nm and up to 5000 μm.

4. The protected substrate according to any one of claims 1 to 3, wherein the protected substrate does not include a temporary protective sheet placed on the surface.

5. The protected substrate according to any one of claims 1 to 4, wherein the burn-off temporary protective layer is the outermost layer of the planar substrate.

6. The burn-off temporary protective layer is disposed over the entire surface of the substrate and at least a portion of the edges of the substrate, according to any one of claims 1 to 5.

7. The protected substrate according to any one of claims 1 to 6, wherein the burn-off temporary protective layer is removable by burning at a temperature of up to 1000°C.

8. A protected substrate according to any one of claims 1 to 7, wherein the combustion of the heat treatment process burns off a burn-off temporary protective layer without causing substantial damage to the surface.

9. A protected substrate according to any one of claims 1 to 8, wherein the heat treatment process does not cause a color change (DECMC) of more than 3 units on the surface compared to the surface color before the heat treatment process.

10. A protected substrate according to any one of claims 1 to 9, further comprising a functional coating disposed between the surface and a burn-off temporary protective layer.

11. The protected substrate according to claim 10, wherein the functional coating includes a low-E coating layer.

12. A protected substrate according to any one of claims 1 to 11, wherein the burn-off temporary protective layer comprises a material having a melting point of at least 60°C and a maximum of 350°C.

13. A protected substrate according to any one of claims 1 to 12, wherein the burn-off temporary protective layer comprises polylactic acid (PLA) and methyl acetate.

14. A method for removing a burn-off temporary protective layer from a coated substrate, The steps include providing a coated substrate including a surface on which a burn-off temporary protective layer is applied to a portion thereof, wherein the burn-off temporary protective layer includes wax, polyolefin, polyester, polycarbonate, polyether, or some combination thereof; and A step of removing the burn-off temporary protective layer from the surface by burning off the burn-off temporary protective layer to form an unprotected substrate without substantially damaging the surface. The above method, including.

15. The method according to claim 14, wherein the burn-off temporary protective layer comprises polylactic acid (PLA), polyethylene carbonate (PEC), polypropylene carbonate (PPC), polycaprolactone, polyoxymethylene, polyethylene, polypropylene, or several combinations thereof.

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