Peelable films as temporary supports

Abstract

The invention relates to a peelable film as a temporary support, comprising:-a substrate having a first surface having a predetermined roughness and / or a predetermined gloss, said substrate being selected from the group comprising plastic materials or metal compounds; and a film comprising at least one compound comprising SiCxOy: H and at least one SiCH3 functional group, said first face of said film being adhered to said substrate and arranged to receive said polymerizable reaction composition on its second face, characterized in that said film has an adjustable peel strength greater than 5 N / 25 mm, and the surface roughness of the film is equivalent to that of the substrate.

Description

Technical Field

[0001] The present invention relates to a peelable film which can be used as a support for polymerizing a reaction composition. Background Art

[0002] Generally, peelable films are used to temporarily support products and are removed after use.

[0003] There are several ways to obtain such films, generally by surface treating a substrate. This substrate can be made of a polymer. Deposition can be carried out by different methods to obtain a thin film on the substrate.

[0004] Such thin films are generally used to reduce the adhesion between the substrate and the product to be protected. Usually, such films need to have a "release" effect to facilitate removal.

[0005] However, these films are not suitable for coating a polymerizable composition or a reaction composition. One of the main drawbacks is the insufficient adhesion between the peelable film and the polymerizable composition, or the dewetting of the surface during the coating process. Therefore, it is difficult to use them as support elements.

[0006] In addition, other known peelable films also have limitations, that is, they cannot ensure good adhesion of the peelable film even when coating a polymerizable composition (dewetting of the surface), or even during the subsequent polymerization of the composition.

[0007] The adhesion of known peelable films cannot provide sufficient support, adhesion, and fixing force to facilitate the handling of reaction compositions or polymerizable compositions, such as polyurethanes or resins.

[0008] Therefore, it is indeed necessary to provide a peelable film that can be used as a support (primer) to enable the application of a polymerizable reaction composition. In this case, it is preferably possible to ensure that the film acts as a support throughout the use process, maintains sufficient film fixing force for a long time, and maintains appropriate adhesion to fully support the various elements inside it, and allows the removal of the peelable film when required according to the intended application. Summary of the Invention

[0009] To solve this problem, the present invention provides a peelable film as a temporary support, which is arranged to allow the polymerization of a reaction composition, the reaction composition comprising a compound containing at least one isocyanate end group and a compound having a group reactive with the at least one isocyanate end group, and comprising:

[0010] - a substrate having a first surface with a predetermined roughness and / or a predetermined glossiness, the substrate being selected from the group comprising plastic materials or metal compounds; and

[0011] - A film comprising at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least equal to 2, y is at least equal to 0.5, the film has a first side and a second side, the first side of the film adheres to the first surface of the substrate and is arranged to receive the polymerizable reaction composition on its second side,

[0012] Characterized in that the film has an adjustable peel strength greater than 5 N / 25 mm, preferably greater than 10 N / 25 mm, more preferably greater than 15 N / 25 mm relative to the substrate, and the first side of the film has a surface roughness and / or glossiness comparable to that of the first surface of the substrate, and optionally, the substrate and the film are arranged to allow the roughness to be transferred to the surface of the polymerizable composition.

[0013] Preferably, the polymerizable composition is based on polyurethane or resin.

[0014] Thus, the peelable film according to the present invention can be used as a support or a base support for a multilayer film system. This means that the second side of the film is ready to receive a (reactive) composition, preferably a polymerizable composition. Therefore, the application is very convenient because uniform application on the peelable film can be ensured. In addition, each film layer, i.e., the peelable film and the composition, will not separate during or after the application process, which is particularly advantageous for the user. This makes it possible to easily process the components according to the intended method. For example, precisely cut the multilayer film product.

[0015] Finally, the peelable film can also be easily removed without damaging the surface of the composition, which makes the film of the present invention have multiple uses.

[0016] The film according to the present invention is also found to have an advantage in terms of service life. After a cycle of at least 3 months, especially in the case of including a polymerizable composition, the film can still maintain its peel strength and surface energy characteristics. Detailed Description

[0017] Therefore, by controlling the adhesion energy generated by the peel strength, a peelable film can be provided, the adhesion of which is sufficient to handle and cut the multilayer film product when used as a support without separating the individual film layers from each other. However, the adhesion of this film should be low enough so that when the support film is removed, it will not damage the formed material or leave any traces on it. The peelable film according to the present invention can be peeled by hand or by thermal transfer to another substrate. In addition, the limited silicone content of the film according to the present invention can avoid transfer to the composition (the material applied to the second side of the film).

[0018] Surprisingly, it has been found that when the film is formed on the substrate, the film conforms to the surface roughness of the substrate. Thus, the film substantially matches the surface roughness of the substrate, which is particularly surprising. The same is true in terms of gloss. Assume that the gloss value of the substrate is 50. After film deposition, this gloss still remains at a comparable level to that of the film (comparable, i.e., approximately equal to the gloss value of the substrate). This is advantageous for the user.

[0019] In addition, optionally, the substrate and the film are arranged to allow the roughness to be transferred from the substrate to the surface of the polymeric composition. In other words, the polymeric composition (which can be in the form of a coating) will have a comparable roughness obtained by transfer. The same is true in terms of gloss.

[0020] More specifically, this also means that the gloss level of the substrate is not adversely affected by film deposition.

[0021] Preferably, during and after the application of the composition (preferably a polymerizable composition), the support provided by the release film can be effectively maintained for a long time.

[0022] The composition according to the invention can be an ink (preferably polyurethane or resin) which, after coating, can transfer a pattern to a T-shirt or any other substrate, or a sprayable composition, or a printable composition, such as a composition intended for vehicles (commonly referred to as "cast film"), preferably in the form of a printable coating on the film according to the invention.

[0023] In addition, in the case of a polymerizable reaction composition, it can be applied to the film by spraying, casting, coating, printing, etc. When the reaction composition comprises a compound containing a polyol and a compound containing an isocyanate end group, polyurethane is formed on the film. The resulting product is cured (e.g., by using a furnace). When using a coating, the release film can be removed.

[0024] Preferably, the polymerizable reaction composition according to the invention is a resin, optionally a prepolymer resin, selected from the group consisting of epoxy resins, polyimide resins, phenolic resins, bismaleimide resins, cyanoacrylate resins and mixtures thereof. Advantageously, the resin is an epoxy resin for a "prepreg" type system, as defined below.

[0025] Generally, the surface of the coating that has been in contact with the film will be used in various application fields and form the film layer of interest, especially "cast (packaging) film" or the covering of various objects. In addition, when the composition is an ink for forming a polyurethane pattern, this application method is generally used to transfer the pattern from one substrate to another, such as a T-shirt.

[0026] Preferably, the peelable film according to the invention is designed to allow the polymerization of a reaction composition which advantageously comprises a compound containing at least one isocyanate end group and a compound having a group reactive with the at least one isocyanate end group.

[0027] Advantageously, measured with a Tesa@7475 adhesive according to the FINAT 10 (FTM10) standard, the peel strength of the second side of the film is less than 30 N / 25 mm, preferably less than 28 N / 25 mm, more preferably less than 25 N / 25 mm, even more preferably less than 15 N / 25 mm, advantageously less than 10 N / 25 mm, more advantageously less than 8 N / 25 mm, and even more advantageously less than 5 N / 25 mm.

[0028] The film may also preferably be used as a support for applying, preferably, an ink based on polyurethane or resin, to transfer it to a separate substrate.

[0029] It has also been found that an adjustable peel strength greater than 5 N / 25 mm can achieve the effects of the present invention. A feature of the present invention is that this peel strength can be adjusted and reach a value of 15 N / 25 mm, preferably 29 N / 25 mm, 30 N / 25 mm, 31 N / 25 mm, 32 N / 25 mm, 33 N / 25 mm, 34 N / 25 mm or 35 N / 25 mm.

[0030] Preferably, the thickness of the film is less than or equal to 6 nm, preferably less than or equal to 5 nm, more preferably less than 3 nm. Even more preferably, the thickness can reach 1 nm. Depending on the desired application, it is thus possible to provide a film containing a certain amount of silicone while retaining the advantages described in the context of the present invention.

[0031] Advantageously, the surface energy of the film according to the invention is between 20 - 30 mN / m, preferably between 25 - 30 mN / m.

[0032] Controlling the surface energy, by limiting or even avoiding any dewetting areas, thus facilitating the application of the composition, which allows the composition to be applied in a uniform and flawless manner, preferably for coating.

[0033] Combining surface energy and peel strength can advantageously provide even more effective peelable films. It is particularly advantageous when the peel strength of the second side of the film according to the present invention (comprising the polymeric composition) is less than 30 N / 25 mm, preferably less than 28 N / 25 mm, more preferably less than 25 N / 25 mm, even more preferably less than 15 N / 25 mm, advantageously less than 10 N / 25 mm, more advantageously less than 8 N / 25 mm, and even more advantageously less than 5 N / 25 mm, as measured according to the FINAT 10 (FTM10) standard using a Tesa® 7475 adhesive. Thus, this peel strength is an advantageous feature of the second side of the film that is in contact with the polymeric composition.

[0034] More preferably, the substrate is made of a polymer material, preferably a biaxially oriented polymer material.

[0035] Advantageously, the substrate is a film made of polyester, polyimide, polyamide, polyetherketone and derivatives thereof.

[0036] Even more advantageously, according to the present invention, when the polymerizable reaction composition is a resin (optionally a prepolymerized resin), the substrate is made of a PET film or a polyimide.

[0037] Even more advantageously, the substrate material is coextruded and / or biaxially oriented.

[0038] Preferably, the substrate is a film made of a material selected from the group consisting of polyethylene terephthalate (PET), polyimide, polyamide, poly(ethylene naphthalate) (PEN), polyetheretherketone (PEEK) and derivatives thereof. Thus, these materials may be biaxially oriented, preferably coextruded and biaxially oriented.

[0039] PET will be preferred, in particular when the polymerizable composition comprises at least one polyisocyanate and one polyol to form a polymeric polyurethane as defined in the present invention.

[0040] Advantageously, the polyimide is chosen to be combined with the resin defined in the present invention.

[0041] In a preferred embodiment, the peelable film serving as a temporary support further comprises a resin, optionally a prepolymerized resin, the film comprising

[0042] a substrate having a first surface with a predetermined roughness and / or a predetermined glossiness, said substrate being selected from the group comprising plastic materials or metal compounds; and

[0043] - a thin film comprising at least one SiC x O yCompounds of H and at least one SiCH3 functional group, where x is at least equal to 2 and y is at least equal to 0.5. The film has a first side and a second side. The first side of the film adheres to the first surface of the substrate, and the resin, optionally pre-polymerized resin, is included on its second side.

[0044] It is characterized in that the film has an adjustable peel strength greater than 5 N / 25 mm, preferably greater than 10 N / 25 mm, more preferably greater than 15 N / 25 mm with respect to the substrate, and the surface roughness and / or glossiness of the first side of the film are comparable to those of the first surface of the substrate. Optionally, the substrate and the film are arranged to allow the roughness to be transferred from the substrate to the surface of the polymerization composition.

[0045] In the presence of the (pre-polymerized) resin, all of the above features can be combined with this preferred embodiment.

[0046] Advantageously, the peelable film according to the present invention can be obtained (or directly obtained) by applying an atmospheric pressure plasma method, which is preferably carried out continuously and includes the following steps:

[0047] - Prepare a plasma gas selected from the group consisting of inert gases and their mixtures;

[0048] - Prepare a volatile precursor selected from the group consisting of cyclic siloxanes, linear siloxanes, and their mixtures;

[0049] - In a coating unit equipped with a plasma, preferably using a roll-to-roll device, roll the substrate having a first surface.

[0050] - Expose the first surface of the substrate to cold plasma deposition in an atmospheric pressure chamber having a gaseous environment containing the plasma gas, preferably using dielectric barrier discharge (DBD), and carried out in the presence of the precursor;

[0051] - Form and deposit the film on the first surface of the substrate, where the film includes at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least 2 and y is at least 0.5, thereby forming the film.

[0052] Particularly advantageously, the exposure of the first side of the substrate occurs within a time period between 50 and 2500 milliseconds.

[0053] In a particular embodiment, the exposure is carried out by maintaining the plasma chamber and / or the substrate in an atmospheric pressure chamber at a temperature below 100 °C.

[0054] According to a preferred embodiment, the cyclic siloxanes are selected from the group consisting of hexamethylcyclotrisiloxane (D3), octamethylcyclopentasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6), vinyl 2,4,6,8 - tetramethyl - 2,4,6,8 - tetravinylcyclotetrasiloxane, and mixtures thereof.

[0055] The linear siloxanes are preferably selected from compounds having the structure: [SiO(CH3)2] n , where n is at least 2.

[0056] Even more preferably, the linear siloxanes are selected from the group consisting of hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, and 1,1,3,3 - tetramethyl - 1,3 - divinyldisiloxane.

[0057] Advantageously, for a useful film with a width of 2 m, the total amount of plasma gas is injected at a flow rate between 45 and 80 m 3 , preferably between 45 and 75 m 3 / h.

[0058] Advantageously, the feed rate of the substrate is between 9 and 70 m / min, preferably between 9 and 65 m / min, and even more preferably between 40 and 65 m / min. Particularly advantageously, the feed rate of the substrate is related to a certain total amount of the injected plasma gas.

[0059] Even more advantageously, for a useful film with a width of 2 m, the precursor is injected at a flow rate between 50 and 200 g / h, preferably between 50 and 150 g / h, and even more preferably between 75 and 115 g / h. Preferably, the feed rate of the substrate is between 9 and 70 m / min, preferably between 9 and 65 m / min, and even more preferably between 40 and 65 m / min. The two parameters of the flow rate and the feed rate can be combined.

[0060] According to a preferred configuration, the method further includes applying a composition, preferably a polymerizable reaction composition, to the second side of the thin film after forming the film.

[0061] As described above, the support film used as the bottom film can receive the composition according to the present invention. Such a composition is preferably polymerizable and can be a resin (from a prepreg), or as described in the present application, can be obtained by reacting a polyisocyanate with a polyol.

[0062] In the case where the resin (from the prepreg) is prepolymerized, the release film according to the present invention can be applied to the resin and protect it.

[0063] In one example of preparing a prepreg, the resin can be applied to the film according to the present invention and then laminated with a reinforcing material (such as carbon fiber) to transfer the resin to the reinforcing material. This can be done on both sides of the reinforcing material (carbon fiber). In other words, the film according to the present invention is present on both sides of the prepreg. Then, one of the two layers of film can be removed and the other layer retained, so that the film can be rolled into a roll and stored. Thus, the release strength can be differentiated and adjusted as needed.

[0064] Other methods of manufacturing prepregs are possible and are known to those skilled in the art. Preferably, the polymerizable reaction composition is obtained by reacting a compound containing at least one isocyanate end group with a compound having a group reactive with the at least one isocyanate end group, or by using a resin, optionally a prepolymerized resin.

[0065] Examples of polyfunctional isocyanates include, but are not limited to: ethylene diisocyanate; 1,4-tetramethylene diisocyanate; 1,6-hexamethylene diisocyanate; 1,12-dodecane diisocyanate; cyclobutane-1,3-diisocyanate; cyclohexane-1,3- and -1,4-diisocyanates and mixtures of their isomers; isophorone diisocyanate; 2,4- and 2,6-hexahydrotoluene diisocyanates and mixtures of their isomers; dicyclohexylmethane-4,4'-diisocyanate (hydrogenated MDI or HMDI); 1,3- and 1,4-phenylene diisocyanate; 2,4- and 2,6-toluene diisocyanates and mixtures of their isomers (TDI); diphenylmethane-2,4'- and / or -4,4'-diisocyanate (MDI); naphthalene-1,5-diisocyanate; triphenylmethane-4,4',4"-triisocyanate; polyphenyl-polymethylene-polyisocyanates obtained by phosgenation after condensation of aniline with formaldehyde (polymeric MDI); meta- and para-isocyanatophenylsulfonyl isocyanate; perchlorinated aryl polyisocyanates; polyfunctional modified isocyanates containing carbodiimide groups, urethane groups, allophanate groups, isocyanurate groups, urea groups or biuret groups; polyfunctional isocyanates obtained by telomerization reactions; polyfunctional isocyanates containing ester groups; and polyfunctional isocyanates containing fatty acid groups. Those skilled in the art will recognize that mixtures of the above polyfunctional isocyanates can be used, preferably mixtures of polymeric MDI and mixtures of MDI isomers.

[0066] The compound having a group reactive with the at least one isocyanate end group is advantageously a polyfunctional polyol or a polyfunctional amine.

[0067] The polyfunctional polyols according to the present invention may be, but are not limited to, polyether polyols, polyester polyols, bio-based or renewable polyols, polyol polymers, or flammable polyols such as phosphorus-based or halogen-based polyols. These polyols may be used alone or in combination as a mixture.

[0068] Based on the total weight of the polymerizable composition, the amount of the polyfunctional polyol may be between 10% and 90%, preferably between 30% and 80%.

[0069] The polyether polyols according to the present invention include alkylene oxide polyether polyols such as ethylene oxide polyether polyols and propylene oxide polyether polyols, and copolymers of ethylene oxide and propylene oxide with terminal hydroxyl groups, which are derived from polyfunctional compounds including diols and triols; such as ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, pentaerythritol, glycerol, diglycerol, trimethylolpropane and similar low molecular weight polyols.

[0070] The polyester polyols according to the present invention include, but are not limited to, polyester polyols formed by the reaction of carboxylic acids with excess diols (such as adipic acid with ethylene glycol or butanediol), or lactones with excess diols (such as caprolactone with propylene glycol). In addition, the polyester polyols according to the present invention may also include linear (partially) branched aliphatic polyols with terminal hydroxyl groups (mainly adipates): low molecular weight aromatic polyesters; polycaprolactones; polycarbonate polyols. The branched or linear aliphatic polyols with terminal hydroxyl groups (mainly adipates) are formed by the reaction of dicarboxylic acids with excess diols, triols and mixtures thereof.

[0071] The renewable polyols according to the present invention include castor oil, sunflower oil, palm kernel oil, palm oil, canola oil, rapeseed oil, soybean oil, corn oil, peanut oil, olive oil, seaweed oil and mixtures thereof.

[0072] Examples of polyfunctional polyols also include, but are not limited to, graft polyols or polyurea-modified polyols. Graft polyols include triols graft copolymerized with vinyl monomers. Suitable vinyl monomers include, for example, styrene or acrylonitrile. Polyurea-modified polyols are polyols containing polyurea dispersions formed by the reaction of diamines and diisocyanates in the presence of polyols. A variant of polyurea-modified polyols is isocyanate polyaddition (PIPA) polyols, which are formed by the in-situ reaction of isocyanates and alkanolamines in polyols.

[0073] The polyfunctional amines used in the present disclosure may include polyether polyamines or polyester polyamines.

[0074] In a preferred embodiment, the compound having a reactive group on the at least one isocyanate end group is a polyether polyol.

[0075] Advantageously, the reaction composition provides a polyurethane. The polyurethane can also be a thermoplastic polyurethane, which can be provided by those skilled in the art.

[0076] Preferably, the polymerizable reaction composition is a resin, optionally a prepolymer resin, selected from the group consisting of epoxy resins, polyimide resins, phenolic resins, bismaleimide resins, cyanoacrylate resins, and mixtures thereof. Advantageously, the resin is an epoxy resin, optionally a prepolymerized epoxy resin. According to an advantageous embodiment, the (prepolymer) resin is formed on a composite structure comprising a reinforcing material selected from the group consisting of carbon fibers, glass fibers, aramid fibers, and combinations thereof.

[0077] Thus, the "prepreg" structure can include the peelable film according to the present invention. The film can be removed when the "prepreg" structure is fully polymerized.

[0078] Preferably, the composition is polymerized, and the surface roughness of the first surface of the substrate is transferred to the surface of the polymerized composition.

[0079] This means that when the polymerized composition is obtained, it matches the surface roughness of the substrate and the film, thereby forming a substantially equivalent roughness on the polymerized composition.

[0080] Advantageously, after removing the film from the polymerized reaction composition, the glossiness of the polymerized composition is preferably retained in the form of a coating.

[0081] This enables the composition to be used as a coating, for example, on another substrate. In terms of the resin, it can be part of a prepreg structure.

[0082] Advantageously, the (reaction) composition is applied by coating, flow coating, spraying, atomizing, or printing (in the case of applying a coating) or in a gaseous manner.

[0083] According to a more preferred embodiment, the service life of the peelable film as a support film is equivalent to at least 2 uses, preferably at least 5 uses, preferably at least 8 uses, and the surface energy and / or peel strength of the film are maintained during repeated use, where each use is equivalent to applying a separate other (reaction) composition on the second surface of the film.

[0084] Other embodiments of the film according to the present invention are specified in the appended claims.

[0085] The present invention also relates to a method for preparing a peelable film as a temporary support, which is arranged to allow the polymerization of a reaction composition comprising a compound containing at least one isocyanate end group and a compound having a group reactive with the isocyanate end group, the method comprising the following steps:

[0086] a. Prepare a plasma gas selected from the group consisting of inert gases and mixtures thereof,

[0087] b. Prepare a volatile precursor selected from the group consisting of cyclic siloxanes, linear siloxanes and mixtures thereof,

[0088] c. In a coating unit equipped with an atmospheric plasma, preferably using a roll-to-roll device, roll a substrate having a first surface and having a predetermined gloss and / or a predetermined surface roughness,

[0089] d. Expose the first surface of the substrate to cold plasma deposition in an atmospheric pressure chamber, optionally for a period of 200 to 2500 milliseconds, the atmospheric pressure chamber having a gaseous environment containing the plasma-forming gas, preferably using dielectric barrier discharge (DBD), and in the presence of the precursor,

[0090] e. Form and deposit the film having a first and a second surface, the film comprising at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least 2 and y is at least 0.5,

[0091] f. Collect the peelable film,

[0092] characterized in that the film has a peel strength greater than 5 N / 25 mm, preferably greater than 10 N / 25 mm, more preferably greater than 15 N / we5 mm, relative to the substrate, and the first surface of the film has a surface roughness and / or gloss comparable to the surface roughness and / or gloss of the first surface of the substrate, and optionally, the substrate and the film are arranged to allow the roughness to transfer from the first surface of the substrate to the surface of the polymerization composition.

[0093] All the features of the above peelable film also apply to the method and all possible combinations of embodiments.

[0094] Other embodiments of the method according to the present invention are specified in the appended claims.

[0095] The present invention also relates to a multilayer film system comprising

[0096] - A polymerizable reaction composition, which optionally comprises a compound containing at least one isocyanate end group and a compound having a group reactive with the at least one isocyanate end group, or a resin, optionally a prepolymer resin,

[0097] - A release film, which serves as a temporary support for the composition and comprises

[0098] ○ A substrate having a first surface with a predetermined roughness and / or a predetermined glossiness, the substrate being selected from the group comprising plastic materials or metal compounds; and on the substrate

[0099] ○ A thin film which comprises at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least equal to 2 and y is at least equal to 0.5, the thin film having a first side and a second side, the first side of the thin film adhering to the first surface of the substrate, and the second side of the thin film being in contact with the polymerizable reaction composition,

[0100] Characterized in that the thin film has a peel strength greater than 5 N / 25 mm, preferably greater than 10 N / 25 mm, more preferably greater than 15 N / 25 mm with respect to the substrate, and the first side of the thin film has a surface roughness and / or glossiness comparable to that of the surface of the substrate, and optionally, the substrate and the thin film are arranged to allow the roughness to transfer from the first surface of the substrate to the surface of the polymerization composition.

[0101] Similarly, all the features of the method and the film of the present invention mentioned above apply to a multi-layer film system, also including all possible combinations of features.

[0102] Other embodiments of the multi-layer film system are specified in the appended claims.

[0103] The present invention also relates to a prepreg-type article or a multi-layer film or system comprising a film according to the present invention. Thus, a prepreg structure can be an exemplary embodiment.

[0104] The present invention also relates to a prepreg-type article comprising a first side and a second side, characterized in that both the first side and the second side are provided with a film according to the present invention.

[0105] Advantageously, the peel strength of the second side of the thin film covering the first side of the prepreg-type article is less than the peel strength of another thin film covering the second side of the prepreg-type article.

[0106] Other embodiments of the article or multi-layer film according to the present invention are specified in the appended claims.

[0107] The present invention also relates to another embodiment, which relates to a peelable film as a temporary support, which is arranged to allow a metal film to be deposited thereon to form a hologram, and comprises:

[0108] a substrate having a first surface, and the substrate is selected from the group consisting of plastic materials or metal compounds; and on the substrate

[0109] - a thin film comprising at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least equal to 2 and y is at least equal to 0.5, the thin film having a first side and a second side, the first side of the thin film adhering to the first surface of the substrate and being arranged to receive the polymerizable reaction composition on its second side,

[0110] characterized in that the film has an adjustable peel strength of specifically greater than 20 N / 25 mm, preferably greater than 22 N / 25 mm, more preferably greater than 23 N / 25 mm, advantageously less than 30 N / 25 mm, and particularly advantageously between 22 - 29 N / 25 mm relative to the substrate.

[0111] Thus, the peelable film according to the present invention can be used as a support or a base support for a multilayer film system. This means that the second side of the thin film is ready to receive the metal film. Each film layer, namely the peelable film and the metal film, will not separate during or after the application process, which is particularly advantageous for the user. Therefore, this makes it possible to easily handle the components according to the intended application. For example, precisely cutting the multilayer film product. Finally, the peelable film can also be easily removed without damaging the surface of the composition, which enables the film of the present invention to have multiple uses.

[0112] By controlling the adhesion energy generated by the peel strength, a peelable film can be provided, the adhesion of which is sufficient to handle and cut the multilayer film product when used as a support without separating the individual film layers from each other. However, the adhesion of this film should be low enough so that when the support film is removed, it will not damage the formed material nor leave any traces on it. The peelable film according to the present invention can be peeled off by hand, usually when obtaining the final product. This means that other films can also be added. When using the final product, the peelable film according to the present invention can be removed. In addition, the limited silicone content of the film according to the present invention can avoid transfer to the composition (the material applied to the second side of the thin film).

[0113] In this case, the composition does not necessarily have to be reactive. Such a composition can be deposited as a metal film in gaseous form, preferably by chemical vapor deposition or evaporation deposition, or can also be applied in liquid form. A person skilled in the art knows how to apply such a composition in order to provide a metal film on the peelable film according to the invention.

[0114] Advantageously, measured with a Tesa@7475 adhesive according to the FINAT 10 (FTM10) standard, the peel strength of the second side of the film according to the invention relative to the metal film is preferably less than 5 N / 25 mm, preferably less than 4 N / 25 mm, more preferably less than 3 N / 25 mm, even more preferably less than 1 N / 25 mm, advantageously less than 0.5 N / 25 mm, and more advantageously less than 0.05 N / 25 mm.

[0115] Furthermore, preferably, the metal film is deposited on a substrate, such as PET. The metal film is then transferred from the PET to the embossed varnish, thereby providing a hologram.

[0116] Preferably, during and after the application of the composition (preferably a polymerizable composition), the support provided by the peelable film can be effectively maintained for a long time.

[0117] Preferably, the thickness of the thin film is less than or equal to 6 nm, preferably less than or equal to 5 nm, more preferably less than 3 nm, and the surface energy of the film is between 20 and 30 mN / m, preferably between 25 and 30 mN / m.

[0118] Preferably, the inert gas is selected from argon, helium, and mixtures thereof.

[0119] More preferably, the substrate is made of a polymer material, preferably a biaxially stretched polymer material.

[0120] More preferably, the substrate is made of a polymer material, preferably a biaxially stretched polymer material.

[0121] Advantageously, the substrate is a film made of polyester, polyimide, polyamide, polyether ketone, and their derivatives.

[0122] Even more advantageously, the substrate material is coextruded and / or biaxially stretched.

[0123] Preferably, the substrate is a film made of a material selected from the group consisting of polyethylene terephthalate (PET), polyimide, polyamide, poly(ethylene naphthalate) (PEN), polyether ether ketone (PEEK), and their derivatives. Thus, these materials can be biaxially stretched, preferably coextruded and biaxially stretched.

[0124] PET will be preferred.

[0125] Advantageously, the film according to this further embodiment can be obtained by successive application of an atmospheric pressure plasma process, which process comprises the following steps:

[0126] - preparing a plasma gas selected from the group consisting of inert gases and mixtures thereof;

[0127] - preparing a volatile precursor selected from the group consisting of cyclic siloxanes, linear siloxanes and mixtures thereof;

[0128] - in a coating unit equipped with a plasma, preferably using a roll-to-roll device, rolling the substrate having a first surface;

[0129] - exposing the first surface of the substrate to cold plasma deposition in an atmospheric pressure chamber having a gaseous environment containing the plasma gas, preferably using dielectric barrier discharge (DBD), and performing plasma polymerization in the presence of the precursor;

[0130] - forming and depositing the thin film on the first surface of the substrate, wherein the thin film comprises at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least 2 and y is at least 0.5, thereby forming the film.

[0131] Advantageously, for a useful film with a width of 2 m, the total amount of plasma gas is injected at a flow rate between 45 and 80 m 3 / h, preferably between 45 and 75 m 3 / h.

[0132] Advantageously, the feed rate of the substrate is between 9 and 70 m / min, preferably between 9 and 65 m / min, more preferably between 40 and 65 m / min. Particularly advantageously, the feed rate of the substrate is related to a certain total amount of the injected plasma gas.

[0133] Even more advantageously, for a useful film with a width of 2 m, the precursor is injected at a flow rate between 50 and 200 g / h, preferably between 50 and 150 g / h, more preferably between 75 and 115 g / h. Preferably, the feed rate of the substrate is between 9 and 70 m / min, preferably between 9 and 65 m / min, more preferably between 40 and 65 m / min. The two parameters of the flow rate and the feed rate can be combined.

[0134] According to an advantageous embodiment, the method further comprises, after forming the film, performing chemical vapor deposition of a metal film on the thin film.

[0135] According to a preferred configuration, the service life of the peelable film as a support film is equivalent to at least 2 uses, preferably at least 5 uses, preferably at least 8 uses, and maintains the surface energy and / or peel strength of the film during repeated use, where each use is equivalent to applying a new, separate metal film on the second side of the thin film by chemical vapor deposition.

[0136] According to another embodiment of the present invention, there is also provided a method for preparing a peelable film as a temporary support, which is arranged to allow the deposition of a metal film and includes the following steps:

[0137] a. Prepare a plasma gas selected from the group consisting of inert gases and their mixtures.

[0138] b. Prepare a volatile precursor selected from the group consisting of cyclic siloxanes, linear siloxanes, and their mixtures.

[0139] c. In a coating unit equipped with an atmospheric plasma, preferably using a roll-to-roll device, roll the substrate.

[0140] d. Expose the first surface of the substrate to cold plasma deposition in an atmospheric pressure chamber having a gaseous environment containing the plasma gas, preferably using dielectric barrier discharge (DBD), and in the presence of the precursor.

[0141] e. Form and deposit the thin film having first and second surfaces, the thin film comprising at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least 2 and y is at least 0.5.

[0142] f. Collect the peelable film.

[0143] The thin film has an adjustable peel strength relative to the substrate that is greater than 20 N / 25 mm, preferably greater than 22 N / 25 mm, more preferably greater than 23 N / 25 mm, advantageously less than 30 N / 25 mm, and particularly advantageously between 22 - 29 N / 25 mm.

[0144] Particularly advantageously, the exposure of the first side of the substrate occurs within a time period between 50 and 2500 milliseconds.

[0145] According to a specific embodiment, the exposure is carried out by maintaining the plasma chamber and / or the substrate at a temperature below 100 °C in an atmospheric pressure chamber.

[0146] According to a preferred embodiment, the cyclic siloxanes are selected from the group consisting of hexamethylcyclotrisiloxane (D3), octamethylcyclopentasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6), vinyl-2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, and mixtures thereof.

[0147] The linear siloxanes are preferably selected from compounds having the structure: [SiO(CH3)2] n , where n is at least 2.

[0148] Even more preferably, the linear siloxanes are selected from the group consisting of hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, and 1,1,3,3-tetramethyl-1,3-divinyldisiloxane.

[0149] Advantageously, for a useful film with a width of 2 m, the total amount of plasma gas is injected at a flow rate between 45 and 80 m 3 / h, preferably between 45 and 75 m 3 / h.

[0150] Advantageously, the feed rate of the substrate is between 9 and 70 m / min, preferably between 9 and 65 m / min, and even more preferably between 40 and 65 m / min. Particularly advantageously, the feed rate of the substrate is related to a certain total amount of the injected plasma gas.

[0151] Even more advantageously, for a useful film with a width of 2 m, the precursor is injected at a flow rate between 50 and 200 g / h, preferably between 50 and 150 g / h, and even more preferably between 75 and 115 g / h. Preferably, the feed rate of the substrate is between 9 and 70 m / min, preferably between 9 and 65 m / min, and even more preferably between 40 and 65 m / min. The two parameters of the flow rate and the feed rate can be combined.

[0152] Other embodiments of further embodiments of the film according to the invention are specified in the appended claims.

[0153] Another embodiment of the peelable film further includes a multi-layer film system, which includes:

[0154] - a metal film,

[0155] - a peelable film, which serves as a temporary support to allow the deposition of the metal film and includes:

[0156] ○ a substrate having a first surface, the substrate being selected from the group comprising plastic materials or metal compounds; and ○ a thin film on the substrate, which includes at least one containing SiC x Oy : A compound of H and at least one SiCH3 functional group, where x is at least 2 and y is at least 0.5. The film has a first side and a second side. The first side of the film adheres to the first surface of the substrate, and the second side of the film contacts the metal film.

[0157] The film has an adjustable peel strength relative to the substrate that is greater than 20 N / 25 mm, preferably greater than 22 N / 25 mm, more preferably greater than 23 N / 25 mm, advantageously less than 30 N / 25 mm, and particularly advantageously between 22 - 29 N / 25 mm.

[0158] Other embodiments of further embodiments of the method according to the invention are specified in the appended claims.

[0159] Furthermore, this other embodiment also relates to an article or a multilayer film that includes a peelable film according to this second embodiment.

[0160] For further embodiments of the film, in other words, for the film, the film obtained by the method, the film preparation method, the system, the article, or the multilayer film, all the features mentioned can be combined with each other.

[0161] Other embodiments of the article according to the invention are specified in the appended claims.

[0162] The invention also relates to an article that includes a prepreg provided with a film according to the invention (as described above), where the film serves as a release film.

[0163] Other embodiments of further embodiments of the method according to the invention are specified in the appended claims.

[0164] The method according to the invention requires the use of a plasma - generating device. The device includes a roll - to - roll system on which the substrate moves continuously. A reactor is also provided, which includes the following elements:

[0165] - A processing cylinder with a suitable dielectric coating (e.g., 400 mm in diameter and 800 mm in length). The cylinder places the substrate to be processed under the processing electrodes (preferably at least 3 electrodes) at a speed selected from the range of 7 to 60 m / min;

[0166] - A processing chamber located above the processing cylinder, which includes electrodes and gas injection devices; the injection devices adjacent to the electrodes can directly inject gases in front of the electrodes and onto the surface of the substrate to be processed. These gases are: inert gases, plasma gases, precursors, carrier gases, and any doping gases.

[0167] The plasma gas according to the invention is preferably argon or helium.

[0168] The electrode is connected to a low-frequency HV generator with variable power (0.1 W / cm 2 to 10 W / cm 2 ). The power density is between 0.10 W / cm 2 and 10 W / cm 2 , preferably between 0.15 W / cm 2 and 8 W / cm 2 , or even between 0.2 W / cm 2 and 5 W / cm 2 , more preferably between 0.25 W / cm 2 and 0.8 W / cm 2 , even more preferably between 0.35 W / cm 2 and 0.7 W / cm 2 . The surface area unit refers to the cumulative surface area of the electrode.

[0169] Therefore, the substrate rolling, exposure, and film-forming steps can be combined with the above elements.

[0170] The extraction system in the processing chamber can evacuate the plasma gas and any by-products generated in the plasma and not converted into deposits. The plasma gas generates plasma, which is a specific feature of atmospheric pressure discharge. The carrier gas is accompanied by the injection of precursors (monomers). The doping agent is injected in a smaller amount compared to the inert gas, plasma gas, and carrier gas. The inert gas, plasma gas, and / or carrier gas can be the same or different and can be argon and / or helium.

[0171] Advantageously, an inert processing atmosphere is maintained in the processing reactor, with an oxygen content of less than 50 ppm, preferably less than 20 ppm, and even more preferably less than 10 ppm.

[0172] The reactor is described, for example, as in patent applications WO2016170242 and application WO2019154976.

[0173] The inert gas, plasma gas, and / or carrier gas can be the same or different and can be argon and / or helium.

[0174] Advantageously, the distance between the active surface of the electrode and the film running below the active surface of the electrode on the processing cylinder can be adjusted to ensure the stability and uniformity of the plasma. For example, if the distance between the film and the active surface of the electrode is set to 1 mm, the standard deviation of this distance is +0.2 mm, with good stability.

[0175] Advantageously, the precursor can be directly injected into the discharge to maximize the concentration between the electrodes. This helps to achieve single-pass processing. A high concentration of the precursor in the discharge usually leads to the formation of powder in the plasma; this powder renders the product unusable and causes many reactor maintenance problems. A high gas velocity can reduce the residence time of the precursor molecules in the plasma, which avoids the formation of powder. Thus, it is possible to operate under conditions of high precursor concentration and perform single-pass deposition without forming powder.

[0176] Advantageously, for a useful film with a width of 2 m, the total amount of plasma gas is injected at a flow rate between 45 and 80 m 3 / h, preferably between 45 and 75 m 3 / h.

[0177] Advantageously, the feed rate of the substrate is between 9 and 70 m / min, preferably between 9 and 65 m / min, more preferably between 40 and 65 m / min. Particularly advantageously, the feed rate of the substrate is related to a certain total amount of the injected plasma gas.

[0178] Even more advantageously, for a useful film with a width of 2 m, the precursor is injected at a flow rate between 50 and 200 g / h, preferably between 50 and 150 g / h, more preferably between 75 and 115 g / h. Preferably, the feed rate of the substrate is between 9 and 70 m / min, preferably between 9 and 65 m / min, more preferably between 40 and 65 m / min. The two parameters of the flow rate and the feed rate can be combined.

[0179] Particularly advantageously, it has been found that when coating a polymerizable reaction composition to form a polyurethane, it is advantageous to process at 60 m / min on a substrate (semi-transparent film - Hostaphan MT50). Even more advantageously, in addition, when coating a polymerizable reaction composition on a substrate (super-matte film - Hostaphan XMTK) to form a polyurethane, it is carried out at 15 m / min. Thus, the feed rate of the film will be adjusted according to the expected requirements and properties.

[0180] The power generated in the plasma is preferably between 900 W and 2000 W, more preferably between 900 W and 1500 W. The plasma gas is preferably argon.

[0181] When the term "resin" is used, within the scope of the present invention, it refers to a resin, optionally a prepolymerized resin, selected from the group consisting of epoxy resins, polyimide resins, phenolic resins, bismaleimide resins, cyanoacrylate resins, and mixtures thereof. Advantageously, the resin is an epoxy resin for a "prepreg" type system as defined below.

[0182] The terms "pre-preg", "pre-preg structure", or "pre-preg product" or "pre-impregnated material" or any equivalent refer to a pre-impregnated structure that comprises a composite structure including a reinforcing material, preferably selected from the group consisting of carbon fibers, glass fibers, aramid fibers, and combinations thereof, and a resin, optionally a pre-polymerized resin, selected from the group consisting of epoxy resins, polyimide resins, phenolic resins, bismaleimide resins, cyanoacrylate resins, and mixtures thereof. Advantageously, the resin is (pre-polymerized) epoxy resin.

[0183] The term "pre-preg" means "pre-impregnated". In other words, a pre-preg product includes a resin, preferably a pre-polymerized resin (for storage / preservation), and a reinforcing material. The release film according to the present invention can protect the pre-preg product before final polymerization.

[0184] In the method for preparing a pre-preg, the reinforcing material is uniformly pre-impregnated with a certain amount of resin, which is usually partially polymerized, that is, it is not fully polymerized but exhibits a certain degree of polymerization. This partially polymerized state prevents the material from premature polymerization during storage and transportation.

[0185] Pre-preg structures are used for producing high-performance composite parts and are widely applied in industries such as aerospace, automotive, and sports equipment.

[0186] Therefore, the release film according to the present invention is a temporary protective film that functions during the preparation of the pre-preg structure, ensures proper handling, prevents premature curing of the resin, and promotes the production of high-quality composite structures using pre-impregnated materials.

[0187] During the process of using a pre-preg to prepare a composite material, the release film is usually removed before final curing. The release film acts as a temporary protective film during the installation and handling of the pre-impregnated material but can be designed to be easily removed before (or after) the curing process.

[0188] Generally, the method for preparing a pre-preg using the film according to the present invention is as follows:

[0189] - The films of the pre-preg structure are usually stacked together with the film provided according to the present invention to form the desired composite structure.

[0190] - In some cases, a debubbling step (pressurization and heating) may be included before final curing to remove air and excess resin and ensure proper consolidation of each layer.

[0191] - Before final polymerization, the release film is carefully removed from the composite structure. This is usually done to allow the resin in the pre-impregnated material to fully cure without being affected by the film.

[0192] For the purposes of the present invention, "substantially" means close to or equal to a reference value or parameter. The term also means that the analyzed value is approximately equal to the reference value or parameter.

[0193] The term "roughness" refers to surface roughness, which can be measured using a roughness meter or profilometer to obtain the coefficient Ra (arithmetic mean deviation from the mean line), the value of which represents the average roughness of the surface within the measurement length, i.e., the average deviation between the peaks and valleys. In addition, the use of atomic force microscopy (AFM) methods can also be considered.

[0194] The advantage of the expression "as a temporary support" is that the film according to the present invention can be pre-tended to be removed, and thus is a support that temporarily protects the product it covers / supports.

[0195] The term "gloss" refers to the gloss of a surface or material measured using devices such as an IGT glossmeter G60 (ISO 2813, ASTM D2457, and ASTM D523). The device used in the examples is an IGT G75, which corresponds to TAPPI reference T480 om-2009 and ISO 8254-1. This device uses a converging beam and can measure the gloss at an angle of 75° to the substrate.

[0196] A predetermined gloss or a predetermined roughness means that the gloss has a certain starting value.

[0197] The term "thin film" refers to the field of plasma, and those skilled in the art can fully understand its meaning.

[0198] The surface energy used in the present invention is calculated based on the Owens, Wendt, Rabel, and Kaelble (OWRK) model by measuring the contact angles of two liquids (water and diiodomethane) using a Krüss DSA 25 instrument.

[0199] Unless otherwise specified, the peel strength is determined based on tests conducted on the "tesa@7475" adhesive, using an AR1000 device according to the FTM 10 standard, preferably at 70 °C for 20 hours.

[0200] The FTM 10 standard is published by FINAT (the International Confederation of Manufacturers and Converters of Adhesives and Hot Melts for Paper and Other Substrates) and is well-known to those skilled in the art:

[0201] - FTM 10 "Quality of silicone-coated substrates for self-adhesive laminates: Peel strength (300 mm per minute)".

[0202] The thickness can be determined by applying XPS technology or by using TEM (transmission electron microscopy) cross-sectional image methods known to those skilled in the art.

[0203] Examples

[0204] Example 1

[0205] Using argon and monomer DMCPS (D5) as precursors, several films according to the present invention were provided. Table 1 below shows the types of PET substrates used and the feed rates applied when forming thin films on the substrates. The peel strength is indicated in the "Tesa 7475" column and is in units of N / 25 mm.

[0206] Table 1

[0207]

[0208] Table 2

[0209] Table 2 shows the surface energy values obtained for different films according to Example 1.

[0210]

[0211]

[0212] Example 2

[0213] It was observed that the gloss before and after film deposition was maintained (see the table below).

[0214]

[0215] Example 3

[0216] Example 3 relates to a nylon (polyamide) substrate which is treated by a plasma method according to the present invention to provide a peelable film comprising a thin film on one of its sides (see the table below).

[0217] Substrate Treatment Surface energy (mN / m) Fp 50110 (N / inch) Fp 7475 (N / inch) Nylon (polyamide) Untreated 48 11.46(±0.42) 30.69(±0.67) Nylon (polyamide) Treated with plasma <30 6.50(±0.46) 8.26(±0.76)

[0218] Example 4

[0219] Example 4 relates to a polyimide (Kapton) substrate which is treated by a plasma method according to the present invention to produce a peelable film comprising a thin film on one of its sides (see the table below).

[0220]

[0221] The peel strength (Fp) of Example 3 and Example 4 is expressed relative to Tesa@7475 adhesive or TESA@50110 adhesive.

[0222] Comparative example

[0223] The untreated PET film has a matte surface roughness and exhibits a given level of gloss. After applying the silicone-based film on the PET, a reduction in the matte effect was observed.

[0224] Furthermore, the peel strength of such films was observed to be 0.1 N / 25 mm.

[0225] Substrate Film Gloss level Untreated PET / 23.3 PET Conventional silicone-based compound 32.6

[0226] Within the scope of the present invention, any singular form of terms such as "a", "an", "the", "said", "of", or "its" can be replaced with terms representing plural forms such as "at least 2", "at least 3", "several", etc.

[0227] The term "comprising", "containing", or any equivalent or derivative term can be replaced with "consisting of" to define a list or exclusive option, thus excluding other elements not listed in the used expression.

[0228] Furthermore, the term "obtainable" or "obtain", or any similar or derivative expression, can be replaced with "directly obtained".

[0229] It should be understood that the present invention is not limited to the above embodiments, and many modifications can be made without departing from the scope of the appended claims.

Claims

1. A peelable film as a temporary support, which is arranged to allow the polymerization of a reaction composition, the reaction composition comprising a compound containing at least one isocyanate end group and a compound having a group reactive with the at least one isocyanate end group, and comprising: - a substrate having a first surface with a predetermined roughness and / or a predetermined glossiness, the substrate being selected from the group comprising polymer materials or metal compounds; and - A thin film comprising at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least equal to 2 and y is at least equal to 0.5, said thin film having a first face and a second face, said first face of said thin film adhering to said first surface of said substrate and being arranged to receive said polymerizable reaction composition on its second face, characterized in that the film has an adjustable peel strength greater than 5 N / 25 mm, preferably greater than 10 N / 25 mm, more preferably greater than 15 N / 25 mm relative to the substrate, and the first surface of the film has a surface roughness and / or glossiness comparable to that of the first surface of the substrate, and optionally, the substrate and the film are arranged to allow the roughness to transfer from the substrate to the surface of the polymerization composition.

2. The membrane according to claim 1, characterized in that, The thickness of the film is less than or equal to 6 nm, preferably less than or equal to 5 nm, more preferably less than 3 nm, and the surface energy of the film is between 20 and 30 mN / m, preferably between 25 and 30 mN / m.

3. The membrane according to claim 1 or 2, characterized in that, Measured with a Tesa@7475 adhesive according to the FINAT10 (FTM10) standard, the peel strength of the second surface of the film is less than 30 N / 25 mm, preferably less than 28 N / 25 mm, more preferably less than 25 N / 25 mm, even more preferably less than 15 N / 25 mm, advantageously less than 10 N / 25 mm, more advantageously less than 8 N / 25 mm, even more advantageously less than 5 N / 25 mm.

4. The membrane according to any one of the preceding claims, characterized in that, The substrate is made of a polymer material, preferably a biaxially stretched polymer material, more preferably the substrate is a film made of polyester, polyimide, polyamide, polyether ketone and their derivatives.

5. The membrane according to any one of the preceding claims, characterized in that, The film can be obtained by a continuous application of an atmospheric pressure plasma method, the method comprising the following steps: - preparing a plasma gas selected from the group consisting of inert gases and their mixtures; - preparing a volatile precursor selected from the group consisting of cyclic siloxanes, linear siloxanes and their mixtures; - in a coating unit equipped with a plasma, preferably using a roll-to-roll device, rolling the substrate having a first surface; - exposing the first surface of the substrate to cold plasma deposition in an atmospheric pressure chamber having a gaseous environment containing the plasma gas, preferably using dielectric barrier discharge (DBD), and performing plasma polymerization in the presence of the precursor; - Forming and depositing the thin film on the first surface of the substrate, wherein the thin film comprises at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least 2 and y is at least 0.5, thereby forming the film.

6. The membrane according to claim 5, wherein For a useful film with a width of 2 m, optionally for a feed rate of the substrate between 9 and 70 m / min, preferably between 9 and 65 m / min, more preferably between 40 and 65 m / min, the total amount of the plasma gas is injected at a flow rate between 45 and 80 m 3 / h, preferably between 45 and 75 m 3 / h.

7. The membrane according to claim 5 or 6, characterized in that, Optionally, for a feed rate of the substrate between 9 and 70 m / min, preferably between 9 and 65 m / min, more preferably between 40 and 65 m / min, for a useful film with a width of 2 m, the precursor is injected at a flow rate between 50 and 200 g / h, preferably between 50 and 150 g / h, more preferably between 75 and 115 g / h.

8. The film according to any one of claims 5 to 7, wherein the method further comprises, after forming the film, applying a polymerizable reaction composition to the second side of the film.

9. The membrane according to any one of claims 5 to 8, characterized in that, The polymerizable reaction composition is obtained by reacting a compound comprising at least one isocyanate end group with a compound having a group reactive with the at least one isocyanate end group, or by applying a resin, optionally by applying a prepolymer resin.

10. The membrane according to any one of claims 5 to 9, characterized in that, The composition is polymerized, and the surface roughness of the first surface of the substrate is transferred to the surface of the polymerized composition.

11. The membrane according to claim 10, wherein After removing the film, the gloss of the polymerized composition is preferably retained in the form of a coating.

12. The membrane according to any one of claims 5 to 11, characterized in that, The reaction composition is applied by printing, coating, flow coating, spraying, atomizing or gaseous means.

13. The membrane according to any one of claims 5 to 12, characterized in that The service life of the release film as a support film is equivalent to at least 2 uses, preferably at least 5 uses, preferably at least 8 uses, and the surface energy and / or peel strength of the film are maintained during repeated use, where each use is equivalent to applying a separate other reaction composition to the second side of the film.

14. A method for preparing a release film as a temporary support, the film being arranged to allow polymerization of a reaction composition comprising a compound containing at least one isocyanate end group and a compound having a group reactive with the isocyanate end group, the method comprising the following steps: a. Preparing a plasma gas selected from the group consisting of inert gases and mixtures thereof, b. Preparing a volatile precursor selected from the group consisting of cyclic siloxanes, linear siloxanes and mixtures thereof, c. In a coating unit equipped with an atmospheric plasma, preferably using a roll-to-roll device, rolling a substrate having a first surface and having a predetermined gloss and / or a predetermined surface roughness, d. Exposing the first surface of the substrate to cold plasma deposition in an atmospheric pressure chamber having a gaseous environment containing the plasma gas, preferably using dielectric barrier discharge (DBD), and in the presence of the precursor; e. Form and deposit the thin film having first and second surfaces, the thin film comprising at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least 2 and y is at least 0.5, f. Collecting the release film, characterized in that the film has a peel strength greater than 5 N / 25 mm, preferably greater than 10 N / 25 mm, more preferably greater than 15 N / 25 mm relative to the substrate, and the first side of the film has a surface roughness and / or gloss equivalent to the surface roughness and / or gloss of the first surface of the substrate, and optionally, the substrate and the film are arranged to allow the roughness to be transferred from the first surface of the substrate to the surface of the polymerized composition.

15. A multi-layer system comprising - a polymerizable reaction composition, optionally comprising a compound containing at least one isocyanate end group and a compound having a group reactive with the at least one isocyanate end group, or a resin, optionally a prepolymer resin, - a release film as a temporary support for the composition, comprising ○ a substrate having a first surface with a predetermined roughness and / or a predetermined glossiness, the substrate being selected from the group comprising plastic materials or metal compounds; and on the substrate ○ A thin film, which comprises at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least equal to 2, y is at least equal to 0.5, the thin film has a first side and a second side, the first side of the thin film adheres to the first surface of the substrate, and the second side of the thin film is in contact with the polymerizable reaction composition It is characterized in that the film has a peel strength relative to the substrate of greater than 5 N / 25 mm, preferably greater than 10 N / 25 mm, more preferably greater than 15 N / 25 mm, and the first face of the film has a surface roughness and / or glossiness comparable to the surface roughness and / or glossiness of the first surface of the substrate, and optionally, the substrate and the film are arranged to allow the roughness to transfer from the first surface of the substrate to the surface of the polymeric composition.

16. A prepreg article or multilayer film or system comprising a film according to any one of claims 1 to 13.

17. The prepreg article according to claim 16, wherein, The article comprises a first face and a second face, each face being provided with the film.

18. A peelable film as a temporary support, arranged to allow a metal film to be deposited thereon to form a hologram, and comprising: - A substrate having a first surface, wherein the substrate is selected from the group comprising plastic materials or metal compounds, and - A thin film on the substrate, which comprises at least one compound containing SiC x O y :H and at least one SiCH3 functional group, where x is at least equal to 2 and y is at least equal to 0.5, the thin film having a first face and a second face, the first face of the thin film adhering to the first surface of the substrate and being arranged to receive the polymerizable reaction composition on its second face, the film has an adjustable peel strength relative to the substrate of greater than 20 N / 25 mm, preferably greater than 22 N / 25 mm, more preferably greater than 23 N / 25 mm, advantageously less than 30 N / 25 mm, particularly advantageously between 22 - 29 N / 25 mm.

19. An article comprising a prepreg provided with a film according to any one of claims 1 to 13, wherein the film serves as a release film.

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