Method of making a coated substrate having anti-blocking properties

Abstract

The present invention provides a method of preparing a stain-resistant coated substrate (e.g., a board, sheet, panel, tile, assembly, or film) for construction and building (e.g., for exterior use), the method comprising coating a substrate with a coating composition of one or more aqueous emulsion polymers and one or more photoinitiators (e.g., a hydrogen-abstracting initiator) onto the substrate to form a coated substrate, at least partially curing or drying the coating, and exposing the at least partially cured coating on the coated substrate to UV light to cause the photoinitiator to react with itself or with the coating composition. In the method, the wavelength of the UV light used preferably matches or at least overlaps the spectral activation or excitation window of the one or more photoinitiators.

Description

[0001] This invention relates to a method for manufacturing a coated substrate, such as for use in the construction and building industries and for use in building structures with anti-blocking coatings, including panels and coated articles. More specifically, this invention relates to a method for preparing a water-based weather-resistant barrier polymer coated substrate (e.g., a panel used as an outer sheath), wherein the method comprises coating the panel with a coating having a photoinitiator that is activated or reacted in the presence of ultraviolet (UV) light, drying the coating, and then exposing the thus-coated panel to UV light to induce anti-blocking properties in the coating.

[0002] When a coated substrate, such as a cover plate that can be used as a building panel, is stacked on or under other coated substrates or other articles, or in contact with them, the coating sometimes becomes "blocked." Coating blockage occurs when the adhesiveness and pressure caused by stacking coated articles on or under another coated article, or by contact with another article, prevent the joint units of the articles from separating from each other; and the polymer coating adheres to the surface of other articles or other coated substrates. In use, the coating may stick to any object it contacts, such as weatherstripping, trim, or a frame or wall adjacent to a coated window or door. When the coating becomes blocked, the result may be an exposed sheet of substrate or removal of the coating or sealant from the coated substrate. In architectural coatings, the ability to separate a stack of coated articles (e.g., panels) or coated articles from another article they contact is called "anti-blocking."

[0003] Thin liner sheets are physical barrier layers placed between objects to prevent products from sticking, adhering, or being damaged during transport. Thin liner sheets can be sheets of paper, corrugated paper, polymer film, or polymer foam. Their use is common for packaging and transporting any item. In cases where pallets are double-stacked, many users add a second thin liner sheet on top of the load. Thin liner sheets provide a degree of abrasion protection and are primarily used to keep the product clean. However, thin liner sheets are unreliable: they can be lost, damaged, or moved / arranged so that they do not completely cover the substrate even without user error (e.g., due to wind). Anti-sticking properties are still required for coated substrates (e.g., coated plates), which eliminates the need for thin liner sheets or other foreign items or accessories besides the coated substrate itself.

[0004] BASF's WIPO patent publication WO 2017 / 017128A1 discloses a multi-component composition for forming a coating film, comprising a photocurable component, a photoinitiator, and a polymer-containing coating that does not contain the photocurable component. The photocurable component comprises an olefinically unsaturated monomer or prepolymer as a component separate from the coating. The photocurable component must remain separate from the coating composition until the composition is applied. As stated in the publication, "coating films formed from the compositions of the present invention exhibit excellent stain resistance (DPUR), stain resistance, anti-blocking properties, etc." However, the BASF publication does not provide any data or other evidence that the multi-component composition effectively provides anti-blocking properties. Furthermore, the presence of unsaturation in any coating can pose weathering problems. Therefore, a method for providing anti-blocking properties using a storage-stable single-component composition remains necessary.

[0005] The inventors have sought to solve the problem of providing anti-adhesion coating substrates, such as for building and construction panels and other coated articles, particularly for external applications such as sheaths, without requiring multi-component coatings and their associated processing problems. Summary of the Invention

[0006] According to the present invention, a method for preparing an anti-adhesion coating substrate includes:

[0007] A water-based coating composition (e.g., a weather-resistant barrier coating composition) is used to at least partially coat a substrate to form a water-based coating, wherein the water-based coating composition contains one or more photoinitiators, such as a hydrogen-abstracting initiator or another initiator that reacts or is activated in the presence of ultraviolet (UV) light, preferably containing a benzophenone group or an initiator containing a xanthonone group.

[0008] The water-based coating is at least partially cured or dried, or preferably completely cured or dried, to form a coated substrate;

[0009] Exposing the coated substrate to UV light, preferably UV light containing light whose wavelength matches the spectral activation window of one or more photoinitiators, results in the coating developing anti-blocking properties and forming an anti-blocking coated substrate. Preferably, when the coated substrate is exposed to ultraviolet (UV) light, the amount of UV light energy exposed to the coated substrate with a wavelength matching the spectral activation window of one or more photoinitiators is 3.5 J / cm². 2 Or greater, or more preferably 4.5 J / cm 2 Or greater, or even more preferably 5J / cm 2 Or larger, or at most 30 J / cm 2 or at most 20J / cm 2Within the scope of the invention. According to the method of the first aspect of the invention, the coating on the coated substrate is at least partially cured or dried, and the method may further include curing or drying the coating by drying and / or heating after exposing the coated substrate to UV light to form an anti-adhesion coated substrate.

[0010] According to the method of the first aspect of the invention, the coated substrate is exposed to UV light for a period of 3 seconds to 2 minutes or preferably 5 to 60 seconds.

[0011] According to the method of the first aspect of the invention, the method may further include cleaning the surface of the anti-adhesion coated substrate with a polar solvent (preferably an alkanol or more preferably isopropanol). In the method wherein only the coating on the coated substrate is partially cured or dried, the method further includes completing the curing or drying of the coating by drying and / or heating after exposing the coated substrate to UV light, and then cleaning it.

[0012] According to a first aspect of the invention, the method includes at least partially coating a substrate to form an aqueous coating, at least partially curing or drying the aqueous coating to form a coated substrate, exposing it to UV light to form an anti-adhesion coated substrate, and then stacking another coated or uncoated substrate (e.g., a plate) on or under the anti-adhesion coated substrate to form an article stack or winding the coated substrate onto itself or onto a multilayer article (e.g., a film) containing the anti-adhesion coated substrate. According to the invention, the method may further include cleaning the surface of the anti-adhesion coated substrate with a polar solvent (preferably an alkanol or more preferably isopropanol) prior to stacking.

[0013] According to a method of a first aspect of the invention, the aqueous coating composition may comprise one or more aqueous emulsion polymers having environmental film-forming properties and a calculated Tg of -100°C to 60°C, or preferably -70°C to 55°C, or even more preferably -50°C to 45°C, or less than 45°C, or for example less than 25°C, or for example greater than -70°C, or for example greater than -50°C. The one or more aqueous emulsion polymers may be rubbery or soft at ambient temperatures.

[0014] According to a method of a first aspect of the invention, the waterborne coating composition may comprise one or more waterborne emulsion polymers, for example, in a waterborne weather-resistant barrier coating composition of one or more waterborne emulsion polymers selected from acrylic polymers and polyurethane dispersions, such as copolymers of C1 to C1 forms. 18 copolymers of alkyl (meth)acrylates, preferably in copolymer form or one or more C8 to C999 acrylates. 18Copolymers of alkyl (meth)acrylates and methyl methacrylate; copolymers of one or more C2 to C5 alkyl acrylates and methyl methacrylate in copolymer form; vinyl acetate-acrylic acid polymers and styrene-acrylic acid copolymers; vinyl acrylate copolymers; and vinyl ether acrylate copolymers, such as copolymers of (meth)acrylates and allyl functional monomers (e.g., allyl methacrylate), such as one or more soft aqueous emulsion polymers having a calculated Tg of -100°C to 25°C, or preferably -70°C to 25°C, or more preferably -5°C or lower.

[0015] Preferably, according to the method of the first aspect of the invention, one or more aqueous emulsion polymers comprise one or more soft (meth)acrylates selected from one or more of the following in copolymer form: butyl acrylate (BA), 2-ethylhexyl acrylate (2-EHA), ethyl acrylate (EA), dodecyl methacrylate, octadecyl methacrylate, octyl methacrylate, isooctyl methacrylate, decyl methacrylate (n-DMA), isodecyl methacrylate (IDMA), pentadecyl methacrylate, octadecyl methacrylate (SMA), octyl acrylate, isooctyl acrylate, decyl acrylate, isodecyl acrylate, and lauryl acrylate (LA).

[0016] Preferably, according to the method of the first aspect of the invention, one or more aqueous emulsion polymers comprise a combination of one or more soft (meth)acrylate alkyl esters in copolymer form and one or more of methacrylate (C2 to C5) alkyl esters, cyclohexyl acrylate, cyclohexyl methacrylate or methyl methacrylate (MMA) in copolymer form.

[0017] Preferably, according to the method of the first aspect of the invention, one or more aqueous emulsion polymers comprise a combination of one or more of the following copolymers: butyl acrylate (BA), 2-ethylhexyl acrylate (2-EHA), ethyl acrylate (EA), dodecyl methacrylate, octadecyl methacrylate, octyl methacrylate, octyl methacrylate, isooctyl methacrylate, decyl methacrylate (n-DMA), isodecyl methacrylate (IDMA), pentadecyl methacrylate, octadecyl methacrylate (SMA), octyl acrylate, isooctyl acrylate, decyl acrylate, isodecyl methacrylate, and lauryl acrylate (LA) with one or more of the following copolymers: alkyl methacrylate (C2 to C5), cyclohexyl acrylate, cyclohexyl methacrylate, or methyl methacrylate (MMA).

[0018] Preferably, according to the method of the first aspect of the invention, one or more aqueous emulsion polymers comprise copolymers of any one or more acrylic or vinyl monomers in copolymer form with monomers containing acids and / or hydroxyl groups.

[0019] Preferably, according to the method of the first aspect of the invention, the waterborne coating composition comprises a metastable waterborne emulsion copolymer of one or more of butyl acrylate (BA), 2-ethylhexyl acrylate (2-EHA), ethyl acrylate (EA), and dodecyl methacrylate and octadecyl methacrylate with a monomer containing an acid and / or hydroxyl group, preferably a monomer containing a carboxyl group or a salt thereof, or more preferably a copolymer of (meth)acrylic acid. In the metastable waterborne emulsion polymer of the invention, for example, the amount of the monomer containing the acid and / or hydroxyl group may be from 0.1% to 3% by weight or, for example, from 0.2% to 2% by weight, for example, from 0.3% to 2.0% by weight.

[0020] Preferably, according to the method of the first aspect of the invention, the waterborne coating composition comprises a metastable waterborne emulsion copolymer of one or more of the copolymers of butyl acrylate (BA), 2-ethylhexyl acrylate (2-EHA), ethyl acrylate (EA), dodecyl methacrylate or octadecyl methacrylate in copolymer form with butyl methacrylate (BMA), methyl methacrylate (MMA) and a copolymer of a monomer (preferably acrylic acid) containing acid and / or hydroxyl groups in copolymer form.

[0021] One or more waterborne emulsion polymers of the waterborne coating composition according to the present invention can constitute a weather-resistant barrier coating composition, for example, a weather-resistant barrier coating composition comprising one or more waterborne emulsion polymers, preferably a waterborne acrylic emulsion polymer with a calculated Tg of 25°C or lower.

[0022] According to a first aspect of the invention, the photoinitiator in the aqueous coating composition includes a hydrogen-abstracting initiator, such as diphenyl ketone or xanthonesone, or another photoinitiator that crosslinks or reacts with itself, dimers or oligomerizes upon exposure to ultraviolet light.

[0023] Preferably, according to the method of the first aspect of the invention, the photoinitiator in the waterborne coating composition is selected from benzophenone, alkylbenzophenone, arylbenzophenone, acetoxyalkyl-substituted benzophenone, xanthoxanone, thioxanthone, and mixtures thereof. More preferably, according to the method of the first aspect of the invention, the photoinitiator in the waterborne weather-resistant barrier coating composition is selected from benzophenone, 4-methylbenzophenone, 2,4,6-trimethylbenzophenone xanthoxanone; isopropyl thioxanthone; and mixtures thereof, such as 4-methylbenzophenone and 2,4,6-trimethylbenzophenone.

[0024] According to the method of the first aspect of the invention, the photoinitiator in the waterborne coating composition comprises a mixture of a photoinitiator and a solvent, such as propylene glycol monomethyl ether acetate, or preferably a dispersible or soluble vinyl or acrylic monomer compatible with waterborne weather-resistant barrier coating materials, such as vinyl esters, vinyl aromatic or (meth)acrylate monomers, or more preferably butyl acrylate.

[0025] According to a method of a first aspect of the invention, the aqueous coating composition comprises, based on the total weight of polymer solids in the coating composition, 0.1% to 2.0% by weight, or preferably 0.2% to 1.4% by weight, or preferably 0.2% to 0.7% by weight, or preferably less than 0.7% by weight, of one or more photoinitiators based on the polymer solids.

[0026] According to a second aspect of the invention, the anti-blocking coating substrate comprises a coating of at least partially cured or dried aqueous emulsion polymer coating composition containing one or more aqueous emulsion polymers, preferably one or more acrylic aqueous emulsion polymers, such as a weather-resistant barrier coating composition layer that is at least partially cured or dried, wherein the coating has one or more photoinitiators, such as hydrogen-abstracting initiators or another initiator that reacts or is activated in the presence of ultraviolet (UV) light, preferably containing benzophenone groups or initiators containing xanthonesone groups, wherein the one or more photoinitiators have reacted with themselves, causing the coating to dimerize or crosslink, or have migrated to the coating surface. The anti-blocking coating substrate may include any coated cardboard, film, sheet, tile, board, component (e.g., window profile or structural profile), or other articles suitable for the construction and building industries.

[0027] Furthermore, according to a second aspect of the invention, the coating comprises one or more partially cured or dried acrylic aqueous emulsion polymers with a calculated Tg of 25°C. Furthermore, according to a second aspect of the invention, stacked or wound articles comprise an anti-adhesion coated substrate, and in the case of stacking, include another article or coated substrate, such as a sheet, or another anti-adhesion coated substrate stacked on or under the anti-adhesion coated substrate. Unless otherwise specified, the temperature and pressure conditions are ambient temperature (23°C) and standard pressure (101.3 kPa).

[0028] Unless otherwise specified, any term containing parentheses or alternatively refers to the entire term, as well as terms without parentheses and combinations of each alternative form. Thus, the term "(poly)ethylene glycol" refers to ethylene glycol, polyethylene glycol, or mixtures thereof.

[0029] All ranges are inclusive and composable. For example, the term "one or more photoinitiators in an amount of 0.1 wt% to 2.0 wt%, or preferably 0.2 wt% to 1.4 wt%, or preferably 0.2 wt% to 0.7 wt%, or preferably less than 0.7 wt%" will include total photoinitiators in amounts of 0.1 wt% to 2.0 wt%, or 0.1 wt% to 1.4 wt%, or preferably 0.1 wt% to 0.7 wt%, or preferably 0.1 wt% to 0.2 wt%, or 0.2 wt% to 2.0 wt%, or preferably 0.2 wt% to 1.4 wt%, or preferably 0.2 wt% to 0.7 wt%, or 0.7 wt% to 2.0 wt%, or preferably 0.7 wt% to 1.4 wt%, or 1.4 wt% to 2.0 wt%.

[0030] As used herein, the term "acrylic acid" refers to alkyl esters, hydroxyalkyl esters, phosphorus- or sulfur-containing esters, salts, amides, or nitriles of acrylic acid or methacrylic acid.

[0031] As used herein, the term "environment" means the conditions in a space in which a method or use is carried out or in which a composition or product is present, including temperature and pressure conditions. For example, environmental conditions of room temperature include the temperature and pressure in a given indoor room or space.

[0032] As used herein, the term "aqueous" refers to a carrier or solvent comprising water and up to 50% by weight of one or more water-miscible organic solvents (e.g., alkyl ethers).

[0033] As used in this article, the term "ASTM" refers to the publications of ASTM International, West Conshohocken, PA.

[0034] As used herein, the terms “blocking resistance” or “blockresistance” refer to undesirable adhesion between two coated surfaces or between paint and other surfaces that a weatherstripping or coated product may come into contact with (e.g., door or window frames).

[0035] As used herein, the terms "calculated glass transition temperature" or "calculated Tg" refer to the use of the Fox equation (Fox, Bulletin of the American Physical Society). Bull.Am.Physics Soc The value calculated by the equation is as follows: (from the book "(1956)", Volume 1, Issue 3, page 123).

[0036] 1 / Tg(calculation)=∑w(M1) / Tg(M1)+w(M2) / Tg(M2)+...w(M n ) / Tg(M n )

[0037] Where Tg(calculated) is the glass transition temperature calculated for the copolymer.

[0038] w(M1) is the weight fraction of monomer M1 in the copolymer.

[0039] w(M2) is the weight fraction of monomer M2 in the copolymer.

[0040] w(M n () represents the weight fraction of monomer Mn in the copolymer.

[0041] Tg(M1) is the glass transition temperature of the homopolymer of M1.

[0042] Tg(M2) is the glass transition temperature of the homopolymer of M2, and

[0043] Tg(M n () is the glass transition temperature of the homopolymer of Mn.

[0044] All temperatures are °K.

[0045] The glass transition temperatures of homopolymers can be found, for example, in the *Polymer Handbook*. Polymer Handbook "(The Book of the Year)," edited by J. Brandrup and E. Himmergut, Interscience Publishers, New York, 1999.

[0046] As used herein, the term “(meth)acrylate” means acrylate, methacrylate and mixtures thereof, and the term “(meth)acrylic acid class” as used herein means acrylic acid class, methacrylic acid class and mixtures thereof.

[0047] As used herein, the term "pigment volume concentration" or %PVC refers to the amount calculated using the following equation:

[0048]

[0049] As used herein, the term "polymer" includes homopolymers and copolymers formed from two or more different monomer reactants or containing two different repeating units.

[0050] As used herein, the terms “total solids” or “solids” refer to all materials in a given composition other than solvents, liquid carriers, non-reactive volatiles (including volatile organic compounds or VOCs), ammonia, and water, including polymers.

[0051] As used in this article, the phrase “weight%” refers to a percentage of weight.

[0052] According to the present invention, a method for preparing an anti-blocking coated article includes treating a coated substrate with ultraviolet (UV) light or exposing the coated substrate to UV light, wherein the coating on the coated substrate comprises an aqueous coating composition containing one or more photoinitiators that is at least partially cured or dried. The method may include coating the substrate to form an aqueous coating, at least partially curing or drying the aqueous coating to form a coated substrate, and then treating the coated substrate with UV light to form an anti-blocking coated substrate. The inventors have discovered that rapid (e.g., 10 seconds to 20 minutes) UV light treatment of a coated article having a coating that is at least partially cured or dried can provide an anti-blocking coated article even if the coating is not fully cured. The method of the present invention makes it possible to readily provide stackable or rollable coated articles for the construction and building industries, such as coated building panels, boards, sheets, films, or tiles, or stacks of articles or rolls containing them. Therefore, exposing the at least partially cured or dried coating of the present invention to ultraviolet (UV) light provides anti-blocking properties to the coated substrate, allowing them to be unfolded and used without damaging the coating or substrate during stacking, storage, and transport. For example, the method may include applying UV light to an outer cover having a dried acrylic emulsion polymer weather-resistant barrier coating in a factory production line, whereby the UV light causes a photoinitiator (e.g., benzophenone contained in the coating) to crosslink, dimerize, or oligomerize. Therefore, the method of the present invention provides a coated substrate with anti-adhesion properties to other coated or uncoated substrates or other articles in contact with them (e.g., during use or storage). Other coated or uncoated substrates or other articles in contact with the coated substrate may be, for example, adjacent structures or articles, such as trim pieces, door frames, wall panels or components, roof panels or components, flooring or components, or window frames or components, any of which are coated or uncoated. The coated substrate can have anti-adhesion properties to the same type of coated substrates, such that none of these use physical paper backing products when they are stacked, stored, and transported to the work site and can be unfolded and used without damaging the coating or substrate.

[0053] According to the method of the invention, after applying the aqueous emulsion polymer coating composition to a substrate, at least partial curing or drying of the aqueous coating may include drying the aqueous coating on the surface of the coated substrate (e.g., a board) at a temperature of 5°C to 100°C (e.g., at room temperature or in a 50°C oven) for a period of time, for example, 5 minutes to 7 days or preferably 10 minutes to 48 hours. When combined with UV light treatment of the coated substrate, sufficient curing or drying provides a coated article that is tactilely dry or has a non-sticky surface. To achieve a non-sticky or tactilely dry coating on the coated substrate, curing or partial curing or drying at lower temperatures requires a longer curing time; while curing or partial curing or drying at higher temperatures requires a shorter time. For example, the coating may be cured or dried in a 50°C oven for 10 minutes, or cured or dried at room temperature and 50% relative humidity (RH) for 12 to 24 hours. Multiple temperatures and multiple curing or drying time periods may be used to maximize energy use or minimize processing time. For example, some or all of the substrate itself can be cured or dried after coating the substrate, such as by curing or drying the resin in the plywood or sheath substrate after applying the water-based coating composition to it.

[0054] To improve the anti-adhesion properties of UV-treated coated substrates (including any of films, panels, tiles, sheets, or boards) under pressures above 69 kPa (0.68 atm) and temperatures above room temperature, the method of the present invention may include cleaning the surface of the coated substrate after exposure to UV light, for example by gently wiping the surface of the substrate with a polar solvent (e.g., isopropanol solution). This cleaning further facilitates the removal of stickiness from the substrate surface.

[0055] According to the method of the invention, one or more ultraviolet lights are used, the wavelength of which will cause the photoinitiator on the coating surface to be activated or excited to extract hydrogen atoms from a nearby donor, which will cause the photoinitiator to react with itself, with the hydrogen donor or with the coating surface, thereby providing sufficient anti-blocking properties to eliminate the need for thin liner paper between stacked substrates or stacked plates.

[0056] Suitable substrates for coating according to the method of the invention and suitable anti-adhesion coating substrates of the invention may include any board, film, sheet, tile, panel, component, or other article for the construction and building industry, which can be successfully coated and then stacked or rolled onto itself or onto other stackable articles. Suitable substrates may include any board, sheet, film, tile, wall component; window component or part thereof, such as profile; door component; roof component; floor component or board made of wood, plywood, oriented strand board (OSB), particleboard, metal, cement, ceramic, gypsum, polymer, polymer foam, or any multilayer article thereof, such as any board, sheet, film, tile, or panel, which may be coated or uncoated. Suitable substrates may include, for example, cladding; cement fiberboard; gypsum board, such as a veneer containing a glass fiber finish; or a foam-coated sheath or cladding, which may or may not include a foil layer. Suitable substrates may include films, such as rubber (Y) films for roofing or waterproofing applications. Another example of a suitable substrate for use in the method according to the invention may include plywood or wood sheaths (e.g., oriented strand board) made by compressing wood chips impregnated with a polymer (e.g., urea or phenol-formaldehyde) in a high-temperature operation. The water-based coating may be applied to the sheath before or after heat curing or drying, while the sheath is still at the elevated temperature in the compression plant.

[0057] According to the method of the present invention, coating a substrate with a water-based coating composition may include applying the coating composition by spraying equipment, brush, or roller. Preferably, the coating composition is applied in a factory, in which case, in addition to the coating methods described above, coating the water-based weather-resistant barrier coating composition may include applying the coating composition to the substrate, such as a sheath, by curtain coating, dip coating, flow coating, spraying, roller coating, or curtain coating machine. Preferably, the coated UV-treated substrate is oven-dried (IR or convection oven) and cooled before stacking.

[0058] The aqueous emulsion polymers and copolymers suitable for the methods of the present invention can be acrylic or vinyl acetate-acrylic polymers, such as (meth)acrylic acid C1-C copolymers. 18 Alkyl esters and copolymers thereof with styrene, methylstyrene, or vinyl ester or vinyl ether monomers, including allyl functional monomers such as allyl methacrylate, or polyurethane dispersions. Suitable polymers for preparing the polymer coatings of the present invention may include aqueous emulsion polymers that are rubbery or soft at ambient temperatures. Such polymers can, for example, provide a weather-resistant barrier coating with a tacky surface after film formation and drying.

[0059] Typically, one or more aqueous emulsion polymers according to the invention have environmental film-forming properties and a calculated Tg of -100°C to 60°C, or preferably -70°C to 55°C, or even more preferably -50°C to 45°C. Such calculated Tg can be in the range of, for example, -5°C or lower, or for example, 25°C or lower.

[0060] According to the method of the present invention, a suitable aqueous emulsion polymer having a desired calculated Tg can comprise a copolymer of any one or more acrylic or vinyl monomers in copolymer form with monomers containing acids and / or hydroxyl groups.

[0061] Preferably, according to the method of the present invention, the aqueous emulsion polymer comprises a copolymer of one or more soft alkyl (meth)acrylates selected from one or more of the following: butyl acrylate (BA), 2-ethylhexyl acrylate (2-EHA), ethyl acrylate (EA), dodecyl methacrylate, octadecyl methacrylate, octyl methacrylate, isooctyl methacrylate, decyl methacrylate (n-DMA), isodecyl methacrylate (IDMA), pentadecyl methacrylate, octadecyl methacrylate (SMA), octyl acrylate, isooctyl acrylate, decyl acrylate, isodecyl acrylate, and lauryl acrylate (LA). More preferably, the aqueous emulsion polymer comprises a copolymer of one or more soft alkyl (meth)acrylates and one or more of alkyl (C2 to C5) methacrylates, cyclohexyl acrylate, cyclohexyl methacrylate, or methyl methacrylate (MMA). Even more preferably, the aqueous emulsion polymer comprises one or more of the following copolymerized forms: butyl acrylate (BA), 2-ethylhexyl acrylate (2-EHA), ethyl acrylate (EA), dodecyl methacrylate or octadecyl methacrylate, in combination with methyl methacrylate (MMA).

[0062] Based on the total weight of the aqueous (co)polymer, the polymers or copolymers of the present invention may have a solids content of 40% by weight or higher, or for example 50% by weight or higher, or preferably 60% by weight or higher, or up to 70% by weight. The aqueous adhesive polymer may be a bimodal or multimodal polymer.

[0063] One or more aqueous emulsion polymers of the waterborne coating composition according to the present invention can constitute a weather-resistant barrier coating composition, for example, a weather-resistant barrier coating composition comprising one or more aqueous emulsion polymers, preferably one or more acrylic aqueous emulsion polymers with a calculated Tg of 25°C or lower. Weather-resistant barrier waterborne coating compositions should be selected to allow adequate water vapor to pass through the building to reduce any moisture condensation in the building walls. Vapor transmission rate is most often measured according to ASTM E-96 (1996) and expressed in perm, where a higher perm is associated with a greater water vapor transmission rate. Oriented strand board (OSB) is a common sheathing material with approximately 3-6 perm. For rooms where internal moisture from cooking and bathing is generated, a weather-resistant barrier layer with >10 perm may be required (b). Conversely, for commercial buildings with high-capacity HVAC systems that remove sufficient moisture from the interior so that moisture does not condense in the walls, a low-permeability weather-resistant barrier layer may be preferred. Those skilled in the art of coating composition formulation can prepare coatings with the desired perm value, measuring candidate coating compositions (b) according to ASTM E-96. In addition, commercially available coatings sometimes have perm data, which can help in selecting a coating that is appropriately matched to building science teachings.

[0064] Other examples of polymers suitable for waterborne weather-resistant barrier coating compositions may include waterborne emulsion polymers, such as metastable acrylic emulsion polymers and styrene-acrylic polymers (e.g., RHOPLEX from Dow). TM 2019R polymer or ACRONAL from BASF TM S-400): Ethylene-vinyl acetate and styrene-butadiene. Aqueous dispersions of polyvinyl chloride may also be used. Examples of suitable aqueous emulsion polymers are described in U.S. Patent No. 7,179,845 (Fomo Products Inc.). Useful acrylic emulsion polymers include RHOPLEX. TM EC-2540 polymer, RHOPLEX TM EC-2020 polymer, RHOPLEX TM EC-1791 QS Polymer, RHOPLEX TM MC-1834 polymer and RHOPLEX TM AC-630, all of them are from The Dow Chemical Co. of Midland, MI. TM 9100 polymer is an acrylic-vinyl acetate copolymer.

[0065] Preferably, the aqueous emulsion polymer comprises a flexible acrylic polymer emulsion, such as RHOPLEX. TM EC-2540 coatings (Dow) are emulsions sold by Dow Corporation.

[0066] 90 copies of RHOPLEX TM EC-2540 polymer / 10 parts Ropaque TM Ultra E (non-film-forming polymers) blends (all from Dow) provide coating opacity.

[0067] Other suitable polymers include:

[0068] Sto Gold Coat containing preferred styrene-acrylic acid copolymer TM Yellow paint, grade 5.7 Perm (Sto Corp of Atlanta, Georgia).

[0069] Preferred polymers include any polymer with a grade greater than 10 perm according to ASTM E-96 (1996), such as

[0070] Henry AIRBLOC TM 33 Coatings, a black coating containing acrylic copolymer (grade 11.6 Perm), from Henry Inc. of Huntington Park, Calif.

[0071] A particularly preferred weather-resistant barrier coating containing a metastable butyl acrylate-methyl methacrylate-acrylic acid copolymer (calculated Tg: -35°C) is formulated for factory applications, applied by spraying, rolling or curtain coating, dried in an oven (IR or convection oven) and cooled before stacking.

[0072] Suitable photoinitiators or ultraviolet-absorbing compounds for use in the methods of the present invention may include diphenyl ketones or any other photoinitiators that are activated or excited upon exposure to ultraviolet light (preferably UV-A or UV-B light). Such photoinitiators will crosslink or react with a hydrogen donor, react with themselves, or dimerize or oligomerize. Suitable photoinitiators may be selected from benzophenones; alkyl, aryl, or acetoxyalkyl-substituted benzophenones, such as 4-methylbenzophenone or 2,4,6-trimethylbenzophenone; xanthoxanones: thioxanthones, such as isopropylthioxanthone; and mixtures thereof, such as 4-methylbenzophenone and 2,4,6-trimethylbenzophenone and mixtures thereof.

[0073] The aqueous coating composition according to the invention may comprise one or more aqueous emulsion polymers prepared by conventional polymerization in water in the presence of an initiator and a surfactant or emulsifier, followed by dilution of the aqueous emulsion polymer into an aqueous pigment dispersion or paste.

[0074] One or more photoinitiators of the present invention may be present in mixtures, such as aqueous compatibility or aqueous dispersions or solutions, which may be combined with or mixed with aqueous coating compositions. Preferably, the mixture containing photoinitiators comprises one or more photoinitiators and an acrylic or vinyl monomer, such as vinyl esters, vinyl aromatics, or (meth)acrylate monomers, even more preferably butyl acrylate, which is compatible with the aqueous coating composition material in which the photoinitiator is dispersible or soluble. For example, benzophenone photoinitiators may be added to the aqueous monomer emulsion during processing, such as before or during polymerization, or diluted into the aqueous emulsion polymer coating.

[0075] Optional components in the waterborne coating compositions according to the invention may include biocides (e.g., fungicides, antifungals, and / or bactericides), insecticides, repellents, rheology modifiers, extenders (fillers), opaque pigments (inorganic and organic (e.g., opaque polymers)), colorants, fly ash, dispersants, defoamers, UV stabilizers, colorants, flame retardants, pH adjusters or buffers, coalescing agents, cosolvents, glass fibers, carbon fibers, microspheres, and antifreeze. The use of opaque pigments is particularly advantageous because it allows the waterborne coating to be visible on the substrate, alerting people to any potentially missed areas and providing consumers and installers with assurance that sufficient coating has been applied. Preferably, the waterborne coating compositions of the invention may contain one or more fillers, pigments, or extenders, or more preferably one or more sacrificial metal oxides, such as zinc oxide. Based on the total weight of the waterborne coating composition, one or more sacrificial metal oxides may be used in amounts from 0.2% to 10% by weight, or for example from 1% to 5% by weight.

[0076] Optionally, the water-based coating composition contains an infrared-reflective material, such as ARCTIC. TM Infrared reflective pigments (Shepherd Color Company, Cincinnati, OH). Other suitable IR reflective pigments are aluminum foil reflective pigments, such as those from Eckart America Corp of Louisville, Kentucky. Other examples of suitable infrared reflective pigments include those described in Lotsch's U.S. Patent No. 4,311,527.

[0077] The advantage of the infrared reflective material in the waterborne coating composition of the present invention is that heat is reflected in the direction in which it is generated: (1) away from the building in summer and (2) into the heated building in winter. This enables energy efficiency throughout the year.

[0078] The waterborne coating compositions of this invention may contain flame retardants or fire-retardant extenders and / or chemical flame retardants. Such extenders include aluminum hydroxide or magnesium hydroxide (Huber Engineered Materials, Atlanta, GA) and vermiculite. Chemical flame retardants include brominated compounds and organophosphorus or boron-based compounds. Such materials are available from Albemarle Corp. of Baton Rouge, Louisiana.

[0079] Preferably, the aqueous coating composition of the present invention contains materials that impart freeze-thaw stability. Such materials include propylene glycol and ethylene glycol. Surfactants such as TRITON may also be used. TM X-405 nonionic surfactant (Dow Chemical Company, Mildred, Michigan) or octylphenyl ethoxylate surfactant to impart freeze-thaw resistance to waterborne coating compositions.

[0080] Example The following examples are for illustrative purposes only and are not intended to limit the invention to these examples. Unless otherwise stated, all temperatures are ambient (21-23°C), relative humidity is 50%, and all pressures are 1 atmosphere.

[0081] The component proportions are shown in the following examples. Use the following abbreviations: Pbw: parts by weight; psi: pounds per square inch; RH: relative humidity.

[0082] The waterborne coating compositions shown in Tables 1, 2, and 3 below comprise an waterborne emulsion polymer and one or more pigments, fillers, and / or extenders as shown, wherein the given pigment volume concentration (% PVC) is 49% and 60% solids content, respectively. Unless otherwise stated, the waterborne emulsion polymers having a measured glass transition temperature (measured Tg) as determined by differential scanning calorimetry (from -90°C to 150°C at a rate of 20°C / min, followed by preheating from the initial temperature to 150°C at a rate of 20°C / min, isothermaling for 2 minutes, and then equilibration at -90°C for 2 minutes to normalize the polymer before measurement) are formed by conventional stepwise addition polymerization of a monomer mixture of (meth)acrylate alkyl ester monomers with one or more olefinically unsaturated carboxylic acid monomers or their salts to form a metastable emulsion polymer. Coating compositions containing a photoinitiator comprise 0.30% by weight of benzophenone based on polymer solids.

[0083] The coatings shown in the examples below are formed by applying the coating compositions shown in Tables 1, 2, and 3 below onto the substrates shown and in the manner shown in each of the following test methods. In each subsequent test method, the cured band includes LC6B FUSION. TM A UV benchtop conveyor belt (Gaithersburg, MD, Maryland) was used, and the transferred UV energy was measured using a UV Power Puck II radiometer positioned on the belt (Electronic Instruments and Technology, Leesburg, VA, Virginia). As used in Tables 1, 2, and 3 below, the term "UV energy" refers to a sensed measurement of the energy emitted from a UV source on the curing belt during UV light exposure or exposure period, such as the UV energy transferred to or accumulated in the substrate over the length of the exposure period. Energy density is recorded in Joules / cm², and a Joule of energy is defined as kg*m². 2 / s 2 It indicates the duration of exposure.

[0084] Test methods The following test methods are used to evaluate the embodiments.

[0085] Anti-adhesion test with free weight In each embodiment shown in Table 2 below, a 100mm wide GARDCO is used. TM A multiple, multi-gap square applicator (Paul N Gardner Company, Inc., Pompano Beach, FL) was used to coat aluminum Q-plates (A46 Abrasive Finish, Q Labs Corporation Westlake, OH) with the coating composition shown to cast a 381-micron thick wet film onto the substrate. Each coated panel was dried under ambient conditions for 7 days (21°C and 50% RH). Once dried, the coated panels shown were exposed to ultraviolet (UV) light (LC6B FUSION) on a curing belt. TMA UV benchtop conveyor belt (Gaithersburg, MD) was used to cure the UV-treated panels. The belt was equipped with iron-doped mercury UV lamps with a spectral window of 205 nm to 445 nm, emitting radiation in the UV-A range. The UV lamp intensity was set to 100%, and the conveyor belt speed was set to 16 feet per minute. The coated panels were passed through the belt one or more times to form a UV-treated coating. Longer exposures proportionally transferred more UV energy to the coating prior to anti-adhesion testing. The total UV energy transferred to each coating is recorded in Tables 2, 3, and 4 below.

[0086] A black Leneta scrubbing board (model P121-10N, Leneta Company, Inc., Mahwah, NJ) was cut into 5.12cm x 5.12cm (2in x 2in) squares and placed directly and uniformly on the 5.12cm x 5.12cm (2in x 2in) square of the UV-coated panel shown. A 5.12cm x 5.12cm x 0.96cm thick (2 x 2 x 3 / 8in) wood panel was uniformly placed on top of the Leneta panel, followed by a 10.24 x 15.36 x 0.64cm (4 x 6 x 1 / 4in) aluminum plate placed directly and uniformly on the partition to support and stabilize a 4.54kg (101b) standard cast weight plate (Dick's Sporting Goods, Pittsburgh, Pennsylvania). Goods, Pittsburgh, PA) – This standard cast weight plate is used to apply a constant load to a coated surface. The weights are applied at 25.8 cm. 2 (4in 2 On the area, a pressure starting from 17.25 kPa (2.5 psi) was generated, and the pressure increased by 17.25 kPa (2.5 psi) with each additional weight applied, with two 4.54 kg (101 bs) weights providing a pressure of 34.5 kPa (5 psi). The assembly was held at 23°C, 50% RH or 50°C / 30% RH for 1 hour, after which the weights and partitions were removed. After 1 minute, the Leneta scrubber was removed to determine anti-adhesion. For each coated Q-plate, a total of two squares of coating were tested under the weight load shown, with identical results, thus the second square confirming the results of the first square. The nature of coating damage and the amount of coating removed were recorded. If the Leneta scrubber was easily removed, the coating passed. If removing the Leneta scrubber required effort or damaged the coating, the coating failed.

[0087] Anti-adhesion test using C-clamp In each embodiment shown in Table 3 below, a 100mm wide GARDCO is used. TMA multi-gap square applicator (Paul N. Gardner Corporation, Pompano Beach, Florida) was used to coat an oriented strand board (Georgia Pacific, Augusta, GA) substrate with the coating composition shown to cast a 381-micron thick wet film onto the substrate. The coating was dried under ambient conditions for 7 days (approximately 21°C and approximately 50% RH). Once dried, the coating was exposed to ultraviolet (UV) light (LC6BFusion) on a curing belt. TM A UV benchtop conveyor belt (Gaithersburg, Maryland) was used. This curing belt was equipped with lamps containing iron-doped mercury UV bulbs with a spectral window of 205 nm to 445 nm and emitting radiation in the UV-A range. The UV lamp intensity was set to 100%, and the conveyor belt speed was set to 16 feet per minute. UV-treated coated wood panels were passed through the curing belt a specified number of times prior to anti-adhesion testing to produce UV-treated coated wood panels.

[0088] Each UV-treated coated wooden board was placed directly and uniformly on top of a 10.24 × 15.36 × 0.64 cm (4 × 6 × 0.25 in) aluminum plate. A second wooden board, 5.12 × 5.12 × 0.96 cm (2 × 2 × 3 / 8 in), used as the block production material, was placed directly and uniformly on the coated square to form a test block. The second aluminum plate was placed directly and uniformly on top of the test blocks to form a bracket-type test assembly. Pressure was applied to the bracket-type test assembly using two C-shaped clamps with a 10.24 cm (4 in) wide opening. A torque wrench (calibrated at 20.3 Nm using the spring scale in the bracket-type test assembly to generate a 36 kg load (151 b-ft, generating an 80 lb load over 4 sq inches)) was used to apply a total pressure of 72.5 kg over 25.4 sq inches or 275 kPa (160 lb load or 40 psi over 4 sq inches) to the clamped bracket-type test assembly via two C-clamps. The bracket-type test assembly was then placed in a 50°C oven for 4 or 18 hours, as shown, to cure the coatings shown. After testing, the C-clamps were released, the pressure and aluminum plates were removed, and the anti-adhesion properties of the test samples were evaluated. Two square coatings were tested for each shown board, with identical results. For each shown coated board, the nature of the coating damage and the amount of coating removed were recorded. If the second board was easily removed, the coating passed. If removing the second board required effort or damaged the coating, the coating failed.

[0089] Anti-adhesion test using a hydraulic hot press In each embodiment shown in Table 4 below, a 100mm wide GARDCO is used. TMA multi-gap square applicator (Paul N. Gardner Corporation, Pompano Beach, Florida) was used to coat an oriented strand board (Georgia Pacific, Augusta, GA) substrate with the coating composition shown to cast a 381-micron (15 mil) thick wet film onto the substrate. The coating was dried under ambient conditions for several days (approximately 21°C and approximately 50% RH). Once dried, the coating was exposed to ultraviolet (UV) light (LC6BFUSION) on a curing belt. TM A UV benchtop conveyor belt (Gaithersburg, Maryland) was used for curing. The curing belt was equipped with iron-doped mercury lamps with a spectral window of 205 nm to 445 nm, emitting radiation in the UV-A range. The UV lamp intensity was set to 100%, and the conveyor belt speed was 16 feet per minute. Prior to anti-adhesion testing, the UV-treated coated wood panels were passed through the curing belt a specified number of times to produce UV-treated coated wood panels. The test block consisted of the UV-treated coated wood panels shown, with a second wood panel measuring 5.12 × 5.12 × 0.96 cm (2 × 2 × 3 / 8 in) placed directly and uniformly on the square of coating and used as the block production material.

[0090] A hydraulic hot press (Fred SCarver Inc., Menomonee Falls, WI) was used to apply a pressure of 275 kPa (40 psi) at 60°C. The test block assembly consisted of the test block shown and a hydraulic press including two insulated heating plates, one above the test block and one below it. Each plate was equipped with a thermocouple connected to a digital controller. Using 5.12 cm × 5.12 cm (2 in × 2 in) test blocks, the press was limited to a load of 72.6 kg (1601b) and a pressure of 275 kPa (40 psi). The test block assembly was held at the indicated temperature and pressure for 4 hours, then the pressure was released and the assembly was removed from the test block. The anti-adhesion properties of the test block were evaluated a few minutes to five minutes after the hydraulic press was safely shut off. For each UV-treated coated wood panel shown, a total of two squares of the coating were tested and the results were recorded. In each embodiment tested below, the results from the second square confirmed the results from the first square. For each coated wood panel shown, the nature of the coating damage and the amount of coating removed were recorded. If the second wood panel was easily removed, the coating passed. If removing the second wood panel required effort or damaged the coating, the coating failed.

[0091] Alcohol-resistant wiping anti-adhesion test Use 100mm wide GARDCOTM A multi-gap square applicator (Paul N. Gardner Corporation, Pompano Beach, Florida) was used to coat an oriented strand board (Augusta-Georgia-Pacific Corporation, Georgia) substrate with the coating composition shown to cast a 381-micron (15 mil) thick wet film onto the substrate to form a coating on the wood. The coating was dried under ambient conditions for 7 days (21°C and approximately 50% RH). Once dried, the coating was exposed to ultraviolet (UV) light (LC6B FUSION) on a curing belt. TM A UV benchtop conveyor belt (Gaithersburg, MD, USA) was used to cure the boards. The belt was equipped with iron-doped mercury bulbs with a UV spectral window of 205 nm to 445 nm and emitted radiation in the UV-A range. The UV lamp intensity was set to 100%, and the conveyor belt speed was 16 feet per minute. The coated boards were passed through the belt a specified number of times prior to anti-adhesion testing to produce UV-treated coated boards. After UV light exposure, KIMTECH boards were impregnated with isopropyl alcohol CAS#67-63-0 (Sigma Aldrich, St. Louis, MO). TM A dry wiping agent (Kimberly Clark; Dallas, Texas) was used to wipe the UV-treated coated wood panels shown, immersing them once in a lightly pressed isopropyl alcohol wet wiping agent. Each wiped UV-treated coated wood panel was dried for at least 10 minutes before the anti-adhesion test shown was performed.

[0092] As shown in Table 2 below, the wavelength of UV-A radiation emitted by the iron-doped mercury lamp matches the spectral activation window of the given photoinitiator BZP. The softer polymer coating of Example 2, with 38% PVC, passed the anti-blocking test at 23°C, 50% RH, and 34.5 kPa (5 psi). Furthermore, in the coating of the harder polymer of Example 4, UV treatment provided anti-blocking properties at 17.25 kPa (2.5 psi) under a high-temperature test at 50°C for 30% PVC. Anti-blocking properties are achieved through UV treatment where the UV wavelength used to treat the coating is at a wavelength that matches the activation energy of the initiator.

[0093] Table 1: Coating formulations used in the examples

[0094]

[0095] 1. TAMOL TM 731A dispersant, Dow Chemical Company, Mildred, Michigan (Dow); 2. TAMOL TM 831 dispersant, Dow Chemical Company; 3. TERGITOL TM15-S-40 surfactant, Dow Chemical Company; 4. ECOSURF TM LF-30 surfactant, Dow Chemical Company; 5. DEE FO TM 1015 defoamer, from Munzing Chemie, GmbH, Heilbronn, Germany (Munzing Chemie); 6. ZOCO TM 101_U539963 Pigment, Zochem, Inc., Brampton, ON, Canada; 7. SNOWHITE TM 12 Pigments, Omya, Inc., Cincinnati, OH (8. DEEFO) TM 1015 defoamer, Mingling; 9. Agitan TM 784 Defoamer, Mingling; 10. Sigma Aldrich, St. Louis, MO (Sigma); 11. Walocel TM MT 6000PV, Dow Chemical; 12. DOWANOL TM DPnB solvent, Dow Chemical Company; 13. COLORTREND 832 yellow iron oxide, Chromaflo Technologies, Ashtabula, OH (Chromaflo); 14. COLORTREND 832 brown clay pigment, Chromaflo; 15. COLORTREND 832 phthalocyanine green, Chromaflo.

[0096]

[0097] As shown in Table 3 above, the UV-treated coated panel made from the coating composition of Example 10 passed the high pressure resistance and anti-blocking test at 275 kPa in combination with UV light exposure and isopropyl alcohol cleaning. However, when compared with Example 8, additional UV exposure may be required to achieve anti-blocking in the higher pressure and higher pressure duration tests. In the C-clamp test, the clamp can also compress the wood in the test block under the tested pressure, making the test difficult to pass. However, at higher test pressures and test durations without alcohol cleaning, the coatings of Examples 7 and 9, as well as Comparative Example 5, did not provide anti-blocking.

[0098] As shown in Table 4 above, the UV-treated coated panels made from the coating composition of Example 12 passed the highest pressure and temperature anti-adhesion test in combination with UV light exposure and isopropyl alcohol cleaning. However, as shown in Comparative Example 11, additional UV exposure may be required to pass the anti-adhesion test at very high pressure and for very long durations.

[0099] As shown in the above embodiments, the substrates that can be used to provide the anti-adhesion coating substrate of the present invention are not particularly limited in terms of materials, and the method according to the present invention can be applied to any type of substrate material to which a given coating composition will adhere.

Claims

1. A method for preparing an anti-adhesion coating substrate, wherein the method comprises: A water-based coating composition is used to at least partially coat the substrate to form a water-based coating, wherein the water-based coating composition contains one or more photoinitiators; The aqueous coating is at least partially cured or dried to form a coated substrate; as well as Exposing the coated substrate to ultraviolet light causes the coating to develop anti-blocking properties and forms an anti-blocking coated substrate; The water-based coating composition comprises the following: A) A metastable aqueous emulsion copolymer of one or more of butyl acrylate, 2-ethylhexyl acrylate, ethyl acrylate, dodecyl methacrylate or octadecyl methacrylate in copolymer form with B) butyl methacrylate, methyl methacrylate and C) a monomer containing acid and / or hydroxyl groups in copolymer form. One or more photoinitiators; Surfactants or emulsifiers; Water; and One or more optional components, selected from biological agents, pesticides, insect repellents, rheology modifiers, extenders, opaque pigments, colorants, fly ash, dispersants, defoamers, UV stabilizers, flame retardants, pH adjusters or buffers, coalescing agents, co-solvents, glass fibers, carbon fibers, microspheres, antifreeze agents, infrared reflective materials, and materials that impart freeze-thaw stability; and The amount of the monomer containing acid and / or hydroxyl group is from 0.2% to 2% by weight. The method further includes cleaning the surface of the anti-adhesion coated substrate with a polar solvent.

2. The method according to claim 1, wherein the one or more photoinitiators are selected from hydrogen abstraction initiators or other initiators that react in the presence of ultraviolet light or are activated in the presence of ultraviolet light.

3. The method according to claim 2, wherein the one or more photoinitiators are initiators containing a benzophenone group or a xanthonone group.

4. The method of claim 1, wherein exposing the coated substrate to ultraviolet light comprises exposing the coated substrate to ultraviolet light energy with a wavelength matching the spectral activation window of at least one of the one or more photoinitiators.

5. The method of claim 4, wherein when the coated substrate is exposed to ultraviolet light, the amount of ultraviolet light energy at which the wavelength of the exposed substrate matches the spectral activation window of the one or more photoinitiators is 3.5 J / cm². 2 Up to 30J / cm 2 Within the range.

6. The method of claim 1, wherein the coating on the coated substrate is completely dried or cured before exposure.

7. The method according to claim 1, wherein the polar solvent is an alkanol.

8. The method of claim 1, wherein the substrate is a plate, and wherein the method further comprises, when necessary, curing or drying the coating on the anti-adhesion coated substrate, and then stacking another plate or coated or uncoated substrate onto the anti-adhesion coated substrate.

9. The method of claim 1, wherein the aqueous coating composition comprises one or more aqueous emulsion polymers having environmental film-forming properties and a calculated glass transition temperature ranging from -100°C to 60°C.

Images