WO2023078980A1 - Identification de défauts de silicone pendant une opération de revêtement en cours de fonctionnement - Google Patents

Identification de défauts de silicone pendant une opération de revêtement en cours de fonctionnement Download PDF

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Publication number
WO2023078980A1
WO2023078980A1 PCT/EP2022/080643 EP2022080643W WO2023078980A1 WO 2023078980 A1 WO2023078980 A1 WO 2023078980A1 EP 2022080643 W EP2022080643 W EP 2022080643W WO 2023078980 A1 WO2023078980 A1 WO 2023078980A1
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WO
WIPO (PCT)
Prior art keywords
weight
release coating
silicone composition
release
film
Prior art date
Application number
PCT/EP2022/080643
Other languages
German (de)
English (en)
Inventor
Siegfried Schmitzer
Sahin SAYGILI
Werner Schmidt
Harald GERLACHER
Original Assignee
Loparex Germany Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Loparex Germany Gmbh & Co. Kg filed Critical Loparex Germany Gmbh & Co. Kg
Publication of WO2023078980A1 publication Critical patent/WO2023078980A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/401—Adhesives in the form of films or foils characterised by release liners characterised by the release coating composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/8422—Investigating thin films, e.g. matrix isolation method
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/005—Additives being defined by their particle size in general
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/016—Additives defined by their aspect ratio
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2483/00—Presence of polysiloxane
    • C09J2483/005—Presence of polysiloxane in the release coating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G01N21/6456—Spatial resolved fluorescence measurements; Imaging
    • G01N2021/646—Detecting fluorescent inhomogeneities at a position, e.g. for detecting defects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/8422—Investigating thin films, e.g. matrix isolation method
    • G01N2021/8427—Coatings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/8422—Investigating thin films, e.g. matrix isolation method
    • G01N2021/8438—Mutilayers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G01N21/57—Measuring gloss
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity

Definitions

  • the invention relates to a method for producing a carrier film coated with a silicone composition.
  • the process enables production errors to be identified during ongoing coating operations.
  • a silicone composition which comprises an auxiliary which can be detected by optical means is applied to one surface side of the carrier film, as a result of which a release coating which contains the auxiliary is obtained.
  • An optical property of the release coating is then determined in order to detect production errors in the release coating, the optical property being dependent on the auxiliary.
  • the film can then be printed on the opposite side of the surface.
  • Release films are often used as removable protective films for adhesive tapes, self-adhesive labels or adhesive sanitary and hygiene articles in order to prevent these products, which are adhesive on one or both sides, from sticking together during storage or processing.
  • release films must be characterized by a good release effect against adhesives such as pressure-sensitive adhesives, hot-melt adhesives or other adhesive materials.
  • release films often have a release coating on a carrier film, which can be based on a silicone composition, for example.
  • release liners it is often desirable to print the release liners for informational, aesthetic, manufacturing, or other reasons.
  • colored tactile, control and/or pressure marks i.e. colored markings
  • This colored tactile, control and / or pressure marks then allow in the manufacture or packaging of products such.
  • Silicone compositions containing colorants are known in the art.
  • US 4,737,537 relates to colored silicone compositions, which can be oils, fats, pastes, resins, emulsions and rubbers, and masterbatches therefor.
  • US Pat. No. 5,182,353 relates to a method for covalently bonding an analyte-sensitive dye compound to an addition-crosslinking silicone.
  • US 5,789,515 relates to a colorant having a siloxane-containing poly(oxyalkylene) copolymer substituent and more particularly to a colorant made from a reactive dye.
  • cationic radiation curable inks do not ghost when coated with solvent, solventless, and radiation curable silicone release coatings.
  • aggressive solvent-based adhesives are poured over ink applied to a substrate and stripped off after drying, no ghosting is observed.
  • WO 03/030796 relates to a single wrapping sheet for a disposable sanitary napkin comprising a nonwoven composite film consisting of a nonwoven fabric having a basis weight of 4 to 25 g/m 2 and a polymeric film having a basis weight of 2 to 20 g/m 2 , and a silicone release layer formed on the nonwoven composite film by applying a thermosetting colored silicone coating agent to the nonwoven composite film and thermosetting such a coating agent.
  • the silicone coating release liner contains organopolysiloxane and is partially formed on the nonwoven composite such that the release liner covers a hot melt of the sanitary napkin within a single package area of the sanitary napkin.
  • EP 2 623 077 relates to an individually wrapped product in which it is difficult to identify the individually wrapped product as an absorbent article from the outside, color does not easily transfer to other individually wrapped products, and the product is placed in a bag , bag, etc. can be brought in and easily transported.
  • WO 2011/103149 relates to release liner materials for use as packaging material for individually packaged disposable absorbent articles, typically sanitary napkins and the like, and release compositions for use in the release liner materials.
  • JP 2000 175964 relates to a plastic film which is produced by adding a colorant to a thermoplastic resin and which is used as a base material in a unit pack material of a sanitary napkin.
  • a colorant an inorganic pigment or an organic pigment or the like which is a component for optionally coloring the plastic film A is usually used.
  • the film defect detection system may include an image capturing unit configured to capture an image of a film in a manufacturing process of the film; a defect detection unit configured to detect defects in the film by analyzing the captured image of the film using a machine learning algorithm that has learned to detect a defect in advance when receiving the captured image of the film; and an information output unit configured to output information about the defects in the film detected by the defect detection unit.
  • TW 97140979 A relates to an optical thin film inspection device suitable for inspecting a thin film sample, the optical thin film inspection device comprising at least one light source with multiple wavelengths, a dispersion collimation module, a multi-channel polarization rotation module, a multi-channel phase delay module, a convergence collimation module, a polarization module and an imaging spectrograph.
  • CN 210322756 U relates to an auxiliary device for detecting defects in the surface of thin films.
  • R.-K. Sheu et al., Appl. May be. 2020, 10, 1206; doi: 10.3390/app 10041206 relates to a device and a method for detecting defects in polymer films.
  • Release films provided with a silicone-based release coating can usually have a full-area (“siliconized wrap film” (SWF)) or a partial area (“siliconized single wrap film” (SSWF)) coating.
  • SWF siliconized wrap film
  • SSWF siliconized single wrap film
  • the release coating is typically on the front of the release film, while the back can have another, e.g. decorative, print.
  • Such separating films are, for example, further processed into packaging or bags for feminine hygiene articles, for example, whereby folding and sealing processes are used on the one hand and the coated surfaces are used to cover adhesive closure surfaces on the other.
  • Printing methods for example flexographic printing methods, are usually used to coat the carrier films with the release coating.
  • Various production defects of the release coating can occur during the coating process.
  • problems with an applicator during printing can lead to large format or no release coating at all.
  • damaged areas of the release coating can be caused by folds or specks in the carrier film or in parts of the carrier film on the sleeve or plate.
  • Line-shaped dropouts within the release coating are also possible if the sleeve has been damaged, e.g. by knife cuts or similar tools.
  • Such production defects of the release coating can be particularly problematic, in which case the release coating is missing over the entire surface over several meters on the film.
  • release films With certain release films, it is also possible to identify possible production errors in the release coating during the coating operation. In the case of polyester-based release films with a smooth surface and silicone-based release coating, production errors can be detected, for example, due to the different gloss of the coated areas compared to areas that are not and/or incorrectly coated.
  • This problem could be counteracted, for example, by increasing the application weight of the release coating to, for example, more than 1.0 g/m 2 . This would increase the gloss of the release coating and it would also be possible to detect production defects in the release coating, even with thin, embossed release films. However, such high application weights of the release coating are usually not desirable since the production costs would increase significantly as a result.
  • DE 10 2009 050 659 A1 relates to a method which comprises stimulating a vehicle component to luminescence and using an adhesive for the vehicle component, the adhesive containing a luminescent dye. Surface contamination with the adhesive is considered a surface defect.
  • WO 2018 011465 A1 relates to a measuring method, a measuring arrangement and a measuring device.
  • a silicone-coated layer (1) is illuminated with a light source (2).
  • a imaging measuring device (4) an image of the silicone-coated layer (1) is generated.
  • the silicone coverage of the silicone coating is analyzed from the image observed image.
  • the object of the invention is to provide advantageous silicone compositions, advantageous release films and an advantageous method for producing such release films.
  • the method should enable the production of preferably embossed release films, which have a comparatively thin release coating, while at the same time detecting possible production errors in the release coating of such release films.
  • auxiliaries are, for example, organic or inorganic colorants which selectively absorb and/or scatter light in the visible wavelength range.
  • colorants can be, for example, dyes or pigments, which can be added in a matrix compatible with the silicone composition.
  • particulate auxiliaries, such as pigments are particularly suitable for detecting production errors in the release coating. These do not agglomerate when added to the silicone composition, and migration of the particles with the resultant ghost dust is also not observed.
  • even comparatively small amounts of such auxiliaries for example less than 1.0% by weight, based on the total weight of the silicone composition, are sufficient to enable production errors in the release coating to be detected.
  • the detection of production errors in the release coating when using corresponding silicone compositions comprising an auxiliary is possible via differences in optical properties between different areas of the release film, such as gloss, brightness and/or contrast.
  • the production errors can be detected, for example, by recording measured values of the optical properties and using the discernible differences in the optical properties between coated and uncoated or defectively coated areas of the release coating. It has been found that these differences, in particular the recording of measured values of the optical properties, can be recorded using an optical measuring device, e.g. a camera system. It is advantageous if these differences are detected directly after the coating and before any further prints are applied to the opposite rear side. In this way, possible disruptive effects due to the prints on the back showing through (contact) transparent release films can be avoided.
  • the color of the front release coating can be matched to the color of a back translucent print.
  • the color of the print on the back can correspond to the color of the release coating, so that the colored release coating is not uncomfortably noticeable when looking at the release film.
  • special decorative and/or marketing-relevant effects by using different colors for the print and the release coating.
  • the use of several printing units for applying, for example, silicone compositions of different colors Allows color schemes of the release coating. In this way, special optical effects can be created, for example in combination with a print on the back.
  • pigment mixtures and effect pigments such as, for example, flat, metallic metal effect pigments; refractive, transparent pearlescent pigments or interference pigments, are suitable as auxiliaries to enable detection of production defects in the release coating. At the same time, targeted optical effects can be generated.
  • the properties of the release coating such as release values, extraction values, reductions in adhesive force, anchoring resistances, coefficients of friction, refractive index, thermal conductivity, electrical conductivity and/or magnetic properties are not impaired by the addition of the auxiliary and are even improved in some cases.
  • the extract values can be lowered, the reduction in adhesive strength reduced and the release values increased or decreased as required.
  • a connection can be made between the curing state of the silicone composition and the optical properties of the release coating, such as, for example, using the color intensity and/or color brightness.
  • the orientation of the preferably particulate auxiliary, e.g. a pigment may depend on whether the silicone composition is in the uncured (e.g. liquid) or in the cured (e.g. solid) state.
  • the resulting optical differences such as differences in reflection, can be used, for example, to identify release coatings that are not cured or not completely cured.
  • the addition of the preferably particulate excipient can accelerate the curing of the silicone composition, thereby additionally avoiding a release coating that is not cured or not completely cured.
  • the application weights of the release coating can also be checked by comparing the measured values determined for the optical properties of the release coating with a reference value, which was determined beforehand, e.g. by means of X-ray fluorescence (XRF). This ensures a uniform coating of the separating films.
  • XRF X-ray fluorescence
  • a first aspect of the invention relates to a method for producing a release film and/or for detecting production defects in a release film, comprising the steps: (a) providing a carrier film which comprises a first surface side and an opposite second surface side, the first surface side comprising an area which is intended for the application of a release coating;
  • silicone composition comprising an auxiliary which can be detected by optical means; wherein the silicone composition is preferably curable and/or contains a solvent;
  • step (d) optionally curing the silicone composition applied in step (c) to obtain an area with a cured release coating
  • step (f) optionally marking of production defects identified in step (e);
  • step (h) possibly sorting out sections of the separating film which have production errors which were possibly marked in step (f).
  • Steps (d), (f), (g) and (h) of the method according to the invention are independently optional.
  • the separating film preferably has a total layer thickness in the range from 10 to 25 ⁇ m; and/or is micro-embossed and has a total embossed layer thickness in the range from 30 to 60 ⁇ m.
  • the release coating preferably has an application weight of at most 1.0 g/m 2 ; preferably at most 0.6 g/m 2 , more preferably at most 0.5 g/m 2 .
  • Release films are known to a person skilled in the art.
  • Release films for the purposes of the invention are preferably plastic-based films, particularly preferably polyolefin-based films, which are used to prevent a sticky surface from adhering prematurely.
  • Release films can be on one or be coated on both sides with a release agent which has a release effect against sticky materials such as glue or putty.
  • the release films according to the invention are preferably used for packaging and as a component of hygiene products, as release and surface films for applications in the construction industry and as a release film for technical adhesive tapes and special labels.
  • a carrier film is provided.
  • the carrier film according to the invention preferably comprises polyester, polyamide or polyolefin such as polyethylene or polypropylene, optionally with different surface treatments.
  • the carrier film can be stretched monoaxially or biaxially.
  • the carrier films according to the invention can serve various functions, which are preferably selected from the group consisting of oxygen barrier, aroma barrier, light protection, rigidity, puncture resistance, print carrier, etc.
  • the release film according to the invention comprises a release coating.
  • the release coating preferably serves to separate the release film from a sticky material, the carrier film being the carrier for the release coating.
  • Frequently used release agents for release coatings can be crosslinkable silicone, oils, fats, certain polyolefins or fluorocarbons.
  • a silicone composition comprises an optically detectable auxiliary and a solvent and/or is curable.
  • the silicone composition preferably serves to uniformly apply a release coating of controlled thickness to the carrier film.
  • the release coating can cover the entire surface and completely cover the carrier film, or only part of the surface and partially cover the carrier film.
  • Techniques preferably used according to the invention for coating, i.e. for applying the silicone composition with which the release coating is preferably formed after evaporation of the solvent, are printing processes. All weights and percentages are based on the total weight of the silicone composition unless expressly stated otherwise.
  • the silicone composition according to the invention comprises an auxiliary which can be detected by optical means, i.e. an auxiliary which can be detected by optical devices due to its interaction with light.
  • step (e) of the method according to the invention at least one optical property of the release coating is determined.
  • the optical properties of a material are determined by the nature of its interactions with incident light, such as diffraction, refraction, scattering, or reflection of the incident light.
  • production defects in the release coating are detected by the at least one optical property determined. Production errors according to the invention are points and/or areas of the release film at which the release coating is not applied to the carrier film and/or cured in the intended manner.
  • Steps (a) to (h) if appropriate are preferably carried out in alphabetical order, although other orders are also possible.
  • the order of steps (a) and (b) is immaterial.
  • all steps take place one after the other.
  • steps (e) and (f) occur simultaneously.
  • step (d) occurs entirely before step (e).
  • step (e) takes place after step (c) and optionally step (d), but before step (g).
  • step (g) occurs before step (h).
  • step (h) occurs before step (g).
  • the process is preferably carried out continuously.
  • the release film according to the invention which is produced using the method according to the invention, preferably has a total layer thickness of
  • - in the range of 5.0 to 50 pm preferably in the range of 10 ⁇ 5.0 pm, or 12.5 ⁇ 7.5 pm, or 12.5 ⁇ 5.0 pm, or 15 ⁇ 10 pm, or 15 ⁇ 7.5 pm, or 15 ⁇ 5, 0 pm, or 17.5 ⁇ 12.5 pm, or 17.5 ⁇ 10 pm, or 17.5 ⁇ 7.5 pm, or 17.5 ⁇ 5.0 pm, or 20 ⁇ 15 pm, or 20 ⁇ 12.5 pm, or 20 ⁇ 10 pm, or 20 ⁇ 7.5 pm, or 20 ⁇ 5.0 pm, or 22.55 ⁇ 17.5 pm, or 22.5 ⁇ 15 pm, or 22.5 ⁇ 12.5 pm, or 22.5 ⁇ 10 pm, or 22.5 ⁇ 7.5 pm, or 22.5 ⁇ 5.0 pm, or 25 ⁇ 20 pm, or 25 ⁇ 17.5 pm, or 25 ⁇ 15 pm, or 25 ⁇ 12.5 pm, or 25 ⁇ 10 pm, or 25 ⁇ 7.5 pm, or 25 ⁇ 5.0 pm.
  • the release film is preferably embossed; preferably micro-embossed; whereby the release film is given an embossed total layer thickness, which typically increases as a result of the embossing.
  • the embossed release film preferably has an embossed total layer thickness of - at least 10 pm on; preferably at least 15 pm, more preferably at least 20 pm, even more preferably at least 25 pm, most preferably at least 30 pm, and especially at least 35 pm;
  • the total layer thickness of an embossed release film indicates the total layer thickness without taking the embossed structure into account, i.e. the height of the embossed elevations relative to the main extension plane of the release film is not taken into account in the total layer thickness.
  • the embossed total layer thickness within the meaning of the invention indicates the total layer thickness of an embossed release film, taking into account the embossed structure, i.e. the height of the embossed elevations relative to the main plane of extension of the release film is taken into account in the embossed total layer thickness.
  • the separating film is preferably at least contact-transparent; preferably transparent.
  • the separating film according to the invention can be fully or partially contact-transparent, i.e. what lies behind the separating film is relatively clearly recognizable when it comes into contact with the film.
  • the separating film according to the invention is preferably fully or partially transparent, i.e. what lies behind the separating film can be seen relatively clearly, the separating film is therefore largely transparent to radiation of the visible spectrum.
  • the release coating is preferably applied to the release film over the entire surface or over part of the surface.
  • the release film according to the invention comprises the carrier film and the release coating, with the release coating preferably directly adjoining the carrier film.
  • the release film preferably has the release coating only on the front side.
  • the separating film comprises the print area, which is printed, on the reverse side on the opposite second surface side.
  • a carrier film which comprises a first surface side and an opposite second surface side, wherein the first surface side comprises an area which is provided for applying a release coating.
  • the carrier film preferably has one or more layers; preferably multilayer; more preferably three-layered.
  • the multilayer carrier film preferably consists of a total of two, three, four, five, six, seven, eight or nine layers; preferably three layers.
  • the carrier film is preferably produced by blown film coextrusion, but other production processes are also possible, in particular cast film extrusion.
  • the carrier film preferably has a symmetrical layer sequence.
  • the carrier film is preferably based on polyolefin, or the carrier film comprises at least one layer which is based on polyolefin.
  • the polyolefin is preferably selected from the group consisting of
  • thermoplastic olefins and or
  • olefin homo- or copolymers of ⁇ , ⁇ -unsaturated olefins having from 2 to 10 carbon atoms preferably selected from the group consisting of polyethylene, polypropylene, polybutylene, polyhexene, polyoctene, copolymers and/or mixtures of at least two of the polymers mentioned; preferably ethylene homo- or copolymers or propylene homo- or copolymers.
  • the carrier film is preferably based on a polyolefin mixture, or the carrier film comprises at least one layer which is based on a polyolefin mixture; preferably a blend of an ethylene homo- or copolymer and a propylene homo- or copolymer.
  • the ethylene homopolymer or the ethylene copolymer is selected from the group consisting of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE).
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • the at least one layer based on polyolefin or the at least one layer based on a polyolefin mixture preferably forms the first surface side of the carrier film.
  • the carrier film preferably comprises at least one layer which is based on an ethylene-vinyl acetate copolymer.
  • the at least one layer based on ethylene-vinyl acetate copolymer preferably forms the first surface side of the carrier film.
  • the first surface side of the carrier film is preferably non-planar.
  • the carrier film is preferably embossed; preferably micro-embossed, i.e. the carrier film is already embossed before the silicone composition according to the invention is applied.
  • the first surface side of the carrier film preferably has embossed elevations.
  • the embossed elevations preferably have an average height
  • the first surface side of the carrier film preferably has an average peak-to-valley height R z according to DIN EN ISO 4287
  • the area of the carrier film which is intended for application of the release coating comprises at least 50% of the first surface side; preferably at least 60%, more preferably at least 70%, even more preferably at least 80%, most preferably at least 90%, and especially 100%.
  • the area which is provided for applying the release coating consists of several sub-areas; preferably format-like sub-areas; particularly preferably rectangular sections.
  • the area which is provided for applying the release coating preferably comprises
  • the first surface side preferably at most 90%, more preferably at most 85%, even more preferably at most 80%, most preferably at most 75% and especially at most 70%.
  • the carrier film preferably comprises an additive or the carrier film comprises at least one layer which comprises an additive; wherein the additive is preferably selected from the group consisting of plasticizers; lubricants; emulsifiers; rheology additives; catalysts; flow control means; optical brighteners; light stabilizers; antioxidants; clarifying agents such as substituted or unsubstituted bisbenzylidene sorbitols; flame retardants; antistatic agents; UV absorbers such as benzoxazinones; propellants; and thiosynergists, such as thiodipropionic acid dilaurylestem or thiodipropionic acid distearyl esters.
  • the additive is preferably selected from the group consisting of plasticizers; lubricants; emulsifiers; rheology additives; catalysts; flow control means; optical brighteners; light stabilizers; antioxidants; clarifying agents such as substituted or unsubstituted bisbenzylidene
  • the carrier film preferably comprises at least one colorant; preferably a pigment.
  • the colorant of the carrier film is titanium dioxide and/or calcium carbonate.
  • the carrier film preferably has a white-beige coloring.
  • a silicone composition which comprises an auxiliary which can be detected by optical means, the silicone composition preferably being curable and/or containing a solvent.
  • the solvent is preferably a Ci-e-alkyl acid Ci-e-alkyl ester.
  • the solvent is preferably selected from the group consisting of ethyl acetate, propyl acetate and/or butyl acetate; preferably ethyl acetate.
  • the content of the solvent is preferably
  • the silicone composition preferably at least 50% by weight, more preferably at least 55% by weight, even more preferably at least 60% by weight, most preferably at least 65% by weight, and especially at least 70% by weight;
  • - ranges from 45 to 95% by weight relative to the total weight of the silicone composition; preferably in the range of 50 ⁇ 5.0% by weight, or 55 ⁇ 10% by weight, or 55 ⁇ 5.0% by weight, or 60 ⁇ 15% by weight, or 60 ⁇ 10% by weight %, or 60 ⁇ 5.0% by weight, or 65 ⁇ 20% by weight, or 65 ⁇ 15% by weight, or 65 ⁇ 10% by weight, or 65 ⁇ 5.0% by weight , or 70 ⁇ 25% by weight, or 70 ⁇ 20% by weight, or 70 ⁇ 15% by weight, or 70 ⁇ 10% by weight, or 70 ⁇ 5.0% by weight, or 75 ⁇ 20% by weight, or 75 ⁇ 15% by weight, or 75 ⁇ 10% by weight, or 75 ⁇ 5.0% by weight, or 80 ⁇ 15% by weight, or 80 ⁇ 10% by weight %, or 80 ⁇ 5.0% by weight 0 //o.
  • the silicone composition is preferably curable by free-radical, cationic, and/or addition crosslinking, preferably by hydrosilylation; preferably radical.
  • the silicone composition is preferably curable thermally, by exposure to UV radiation, and/or by exposure to electron beams; preferably by exposure to UV radiation.
  • the silicone composition comprises a silicone component; preferably a chemically cross-linkable silicone component.
  • the silicone component preferably comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of addition-crosslinking, preferably metal-catalyzed addition-crosslinking; condensation-crosslinking, free-radically crosslinking, and/or cationically crosslinking polysiloxanes; preferably radically crosslinking polysiloxanes.
  • Suitable polysiloxanes are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFFTM from Dow Chemical, under the trade name SilcoleaseTM from Elkem Silicones, under the name DMS-R, DMS-U or DBE- U from Gelest, Inc. or under the designation KF-2005 or X-62-7205 from Shin-Etsu Chemical Co., Ltd.
  • the silicone component preferably comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes; preferably acrylate functionalized polysiloxanes chemically crosslinkable by UV radiation.
  • Suitable polysiloxanes are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFFTM from Dow Chemical, under the trade name SilcoleaseTM from Elkem Silicones, under the name DMS-R, DMS-U or DBE- U from Gelest, Inc. or under the designation KF-2005 or X-62-7205 from Shin-Etsu Chemical Co., Ltd.
  • the silicone component includes a release modifier; preferably the release modifier is an acrylate-functionalized polydimethylsiloxane.
  • Suitable release modifiers are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFFTM from Dow Chemical, or under the trade name SilcoleaseTM from Elkem Silicones.
  • the silicone component can consist of a single chemically crosslinkable polysiloxane or can comprise a mixture of several chemically crosslinkable polysiloxanes.
  • the silicone component preferably comprises at least one chemically crosslinkable polysiloxane and a release modifier.
  • the content of the silicone component is preferably
  • the silicone composition preferably at least 10% by weight, more preferably at least 14% by weight, even more preferably at least 18% by weight, most preferably at least 22% by weight, and especially at least 25% by weight;
  • - ranges from 5.0 to 55% by weight relative to the total weight of the silicone composition; preferably in the range of 10 ⁇ 5.0% by weight, or 15 ⁇ 10% by weight, or 15 ⁇ 5.0% by weight, or 20 ⁇ 15% by weight, or 20 ⁇ 10% by weight, or 20 ⁇ 5.0% by weight, or 25 ⁇ 20% by weight, or 25 ⁇ 15% by weight, or 25 ⁇ 10 wt%, or 25 ⁇ 5.0 wt%, or 30 ⁇ 25 wt%, or 30 ⁇ 20 wt%, or 30 ⁇ 15 wt%, or 30 ⁇ 10 wt% %, or 30 ⁇ 5.0% by weight, or 35 ⁇ 20% by weight, or 35 ⁇ 15% by weight, or 35 ⁇ 10% by weight, or 35 ⁇ 5.0% by weight , or 40 ⁇ 15% by weight, or 40 ⁇ 10% by weight, or 40 ⁇ 5.0% by weight, or 45 ⁇ 10% by weight, or 45 ⁇ 5.0% by weight, or 50 ⁇ 5.0% by weight.
  • the silicone composition preferably comprises a catalyst and/or a photoinitiator; preferably a photoinitiator.
  • the catalyst and/or photoinitiator is preferably selected from the group consisting of a-hydroxy, a-alkoxy or a-amino aryl ketones, acylphosphine oxides, aliphatic azo compounds, onium compounds or platinum compounds.
  • Suitable photoinitiators are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFFTM from Dow Chemical, or under the trade name SilcoleaseTM from Elkem Silicones.
  • platinum compounds examples include hexachloroplatinic acid, cisplatin, platinum carbonylcyclovinylmethylsiloxane complexes, platinum divinyltetramethyldisiloxane complexes, platinum cyclovinylmethylsiloxane complexes, and platinum octanaldehyde/octanol complexes.
  • the content of the catalyst and/or the photoinitiator is preferably
  • - at least 0.4% by weight relative to the total weight of the silicone composition; preferably at least 0.5% by weight, more preferably at least 0.6% by weight, even more preferably at least 0.7% by weight, most preferably at least 0.8% by weight, and especially at least 0.9% by weight. -%;
  • - ranges from 0.4 to 1.5% by weight relative to the total weight of the silicone composition; preferably in the range of 0.5 ⁇ 0.1% by weight, or 0.6 ⁇ 0.2% by weight, or 0.6 ⁇ 0.1% by weight, or 0.7 ⁇ 0.3 wt%, or 0.7 ⁇ 0.2 wt%, or 0.7 ⁇ 0.1 wt%, or 0.8 ⁇ 0.4 wt%, or 0.8 ⁇ 0 .3% by weight, or 0.8 ⁇ 0.2% by weight, or 0.8 ⁇ 0.1% by weight, or 0.9 ⁇ 0.5% by weight, or 0.9 ⁇ 0.4% by weight, or 0.9 ⁇ 0.3% by weight, or 0.9 ⁇ 0.2% by weight, or 0.9 ⁇ 0.1% by weight, or l .0 ⁇ 0.5% by weight, or 1.0 ⁇ 0.4% by weight, or 1.0 ⁇ 0.3% by weight, or 1.0 ⁇ 0.2% by weight, or 1.0 ⁇ 0.1% by weight, or 1.1 ⁇ 0.4% by weight, or 1.1 ⁇ 0.3% by weight, or 1.1 ⁇ 0.2% by weight %, or 1.1 ⁇ 0.1% by weight
  • the silicone composition preferably comprises a reactive diluent; preferably an acrylate functionalized reactive diluent.
  • the reactive diluent is preferably selected from the group consisting of hexanediol diacrylate (HDDA), dipentaerythritol hexaacrylate (DPHA), tripropylene glycol diacrylate (TPGDA), pentaerythritol triacrylate (PETA), pentaerythritol tetraacrylate, neopentyl glycol diacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate (HEMA), bis[methacryloyloxy]ethyl] phosphate, glycidyl acrylates, and glycidyl methacrylates.
  • HDDA hexanediol diacrylate
  • DPHA dipentaerythritol hexaacrylate
  • TPGDA tripropylene glyco
  • the content of the reactive diluent is preferably
  • the silicone composition preferably at least 1.0% by weight, more preferably at least 1.1% by weight, even more preferably at least 1.2% by weight, most preferably at least 1.3% by weight, and especially at least 1.4% by weight. -%;
  • - ranges from 0.9 to 2.0% by weight relative to the total weight of the silicone composition; preferably in the range of 1.0 ⁇ 0.1% by weight, or 1.1 ⁇ 0.2% by weight, or 1.1 ⁇ 0.1% by weight, or 1.2 ⁇ 0.3 wt%, or 1.2 ⁇ 0.2 wt%, or 1.2 ⁇ 0.1 wt%, or 1.3 ⁇ 0.4 wt%, or 1.3 ⁇ 0 .3% by weight, or 1.3 ⁇ 0.2% by weight, or 1.3 ⁇ 0.1% by weight, or 1.4 ⁇ 0.5% by weight, or 1.4 ⁇ 0.4% by weight, or 1.4 ⁇ 0.3% by weight, or 1.4 ⁇ 0.2% by weight, or 1.4 ⁇ 0.1% by weight, or l .5 ⁇ 0.5% by weight, or 1.5 ⁇ 0.4% by weight, or 1.5 ⁇ 0.3% by weight, or 1.5 ⁇ 0.2% by weight, or 1.5 ⁇ 0.1% by weight, or 1.6 ⁇ 0.4% by weight, or 1.6 ⁇ 0.3% by weight, or 1.6 ⁇ 0.2% by weight %, or 1.6 ⁇ 0.1% by weight, or 1.7
  • the silicone composition provided in step (b) of the method according to the invention comprises an auxiliary which can be detected by optical means and with the aid of which production errors in the release coating can be detected in step (e) of the method according to the invention.
  • at least one optical property of the release coating is preferably dependent on the auxiliary
  • the content of the auxiliary is preferably
  • the silicone composition preferably at most 1.0% by weight relative to the total weight of the silicone composition; preferably at most 0.95% by weight, more preferably at most 0.9% by weight, even more preferably at most 0.85% by weight, most preferably at most 0.8% by weight, and in particular at most 0.75% by weight.
  • -% and or - ranges from 0.2 to 1.0% by weight relative to the total weight of the silicone composition; preferably in the range of 0.3 ⁇ 0.1% by weight, or 0.4 ⁇ 0.2% by weight, or 0.4 ⁇ 0.1% by weight, or 0.5 ⁇ 0.3 wt%, or 0.5 ⁇ 0.2 wt%, or 0.5 ⁇ 0.1 wt%, or 0.6 ⁇ 0.4 wt%, or 0.6 ⁇ 0 .3% by weight, or 0.6 ⁇ 0.2% by weight, or 0.6 ⁇ 0.1% by weight, or 0.7 ⁇ 0.3% by weight, or 0.7 ⁇ 0.2% by weight, or 0.7 ⁇ 0.1% by weight, or 0.8 ⁇ 0.2% by weight, or 0.8 ⁇ 0.1% by weight, or 0 .9 ⁇ 0.1 wt%.
  • the auxiliary is preferably selected from the group consisting of colorants, preferably dyes and/or pigments; whitening; and their mixtures.
  • the adjuvant selectively absorbs and/or scatters light in the visible wavelength range; preferably in a wavelength range of 400 to 750 nm.
  • the adjuvant is a colorant; preferably an organic or an inorganic colorant.
  • a colorant is a coloring substance.
  • Colorants preferred according to the invention are inorganic colorants or organic colorants with regard to their chemical composition.
  • Colorants preferred according to the invention are natural colorants or synthetic colorants with regard to their origin.
  • Colorants preferred according to the invention are white colorants, black colorants, chromatic colorants, effect colorants or luminous colorants with regard to their color.
  • Colorants preferred according to the invention are pigments or dyes with regard to their solubility; Dyes are typically soluble in application media such as water or other solvents, while pigments are practically insoluble and exist in application media as a particulate solid, possibly in suspension.
  • the adjuvant preferably comprises a mixture of two or more colorants.
  • the colorant is preferably a dye, preferably selected from chromatic dyes, black dyes and/or fluorescent dyes.
  • the auxiliary comprises or consist of a fluorescent dye.
  • Coloring the silicone composition and thus also the release coating with fluorescent dye has the advantage that this is only visible under UV radiation and therefore does not impair the aesthetic appearance of the release film in daylight.
  • the adjuvant preferably does not include a fluorescent dye.
  • release films generally do not have sufficient barrier properties, so that fluorescent dyes within the intended storage time, which can cause so-called "ghost prints" to occur. It is therefore preferred according to the invention to use as auxiliaries those colorants which show little or no tendency to migrate.
  • the dye is preferably selected from the group consisting of alizarin violet, crystal violet, mauvein, indigo, process cyan, solid green, brilliant yellow, Indian yellow, chrome yellow, saffron, solid yellow, benzaurine, pyranthrone orange, eosin, crimson, naphthol red, aurine, and/or aniline black.
  • Dyes which are not toxic to humans are preferably used.
  • the colorant is a pigment; preferably selected from white pigments, colored pigments, black pigments, luminescent pigments, and/or effect pigments, preferably metal effect pigments, pearlescent pigments, or interference pigments.
  • the pigment is preferably selected from the group consisting of dioxazine violet, Berlin blue, indanthrone blue, cobalt blue, phthalocyanine blue, ultramarine, chromium oxide green, green earth, verdigris, cobalt green, phthalocyanine green, benzimidazolones, bismuth vanadate, brilliant yellow, chromium antimony titanate, indolinones, nickel dioxin yellow, Nickel titanium yellow, aureolin, cerium sulfide, perinone, quinacridones, dibromoanthanthrone, diketopyrrolopyrrole pigments, perylene red, 3,4,9,10-perylenetetracarboxylic acid dianhydride (PTCDA), umber, barium sulfate, white lead, calcium carbonate, lithopones, titanium dioxide , zinc oxide, zinc sulfide, aniline black, iron oxide black, and/or spinel black. Suitable pigments are commercially available,
  • Such pigments are preferably used which are not toxic to humans.
  • the colorant is preferably a blue, black and/or violet colorant.
  • the adjuvant preferably brings about a coloring of the silicone composition and thus also of the release coating.
  • the silicone composition is preferably colored blue, black and/or violet.
  • the adjuvant is preferably particulate; preferably with an average particle size of at least 10 nm, preferably at least 50 nm, more preferably at least 100 nm, even more preferably at least 200 nm, most preferably at least 500 nm, and in particular at least 1.0 ⁇ m; at most 10 pm, preferably at most 5.0 pm. more preferably at most 2.0 ⁇ m, still more preferably at most 1.0 ⁇ m, most preferably at most 0.5 ⁇ m, and especially at most 0.2 ⁇ m; and or
  • the excipient is non-spherical; preferably rod-shaped or plate-shaped.
  • the adjuvant preferably has an aspect ratio of at least 1.1; preferably at least 1.2, more preferably at least 1.3, even more preferably at least 1.4, most preferably at least 1.5, and especially at least 1.6.
  • the adjuvant is particularly preferably a particulate non-spherical pigment.
  • the excipient is preferably spatially anisotropically aligned in the course of the method according to the invention; preferably in step (d); particularly preferably by evaporating at least part of the solvent.
  • the spatial orientation of the adjuvant is preferably dependent on the curing state of the release coating.
  • the release coating can be in an uncured state or in a cured state.
  • the release coating is preferably liquid or pasty in the uncured state and the polysiloxanes preferably present are not crosslinked.
  • the release coating is preferably solid and the polysiloxanes that are preferably present are crosslinked.
  • the release coating is preferably in the cured state.
  • the adjuvant preferably orients itself spatially during the curing of the silicone composition to obtain the cured release coating.
  • the auxiliary contributes to influencing the optical properties of the release coating in such a way that production defects can be identified.
  • the auxiliary can be mixed in pure form with the other components of the silicone composition, i.e. with the solvent described above, the silicone component described above, optionally including a release modifier, the catalyst or photoinitiator described above, and/or the reactive diluent described above.
  • the auxiliary used as the starting material is not present in pure form, but rather already in a composition, referred to below as “matrix”.
  • matrix Such compositions are commercially available and known to a person skilled in the art.
  • the components of the matrix are compatible with the other components of the silicone composition.
  • the adjuvant is present in a matrix compatible with the silicone composition; the matrix in turn preferably comprising a polymerizable component, a reactive diluent and/or a photoinitiator.
  • the polymerizable component, the reactive diluent and the photoinitiator can each independently be the same as the silicone component, release modifier, catalyst, photoinitiator or reactive diluent in the silicone composition according to the invention, or they can be different.
  • the matrix compatible with the silicone composition is co-curable with the silicone composition.
  • the polymerizable component of the silicone composition-compatible matrix comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of addition-crosslinking, preferably metal-catalyzed addition-crosslinking; condensation-crosslinking, free-radically crosslinking, and/or cationically crosslinking polysiloxanes; preferably radically crosslinking polysiloxanes; and/or selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes; preferably acrylate-functionalized polysiloxanes which can be chemically crosslinked by UV radiation.
  • chemically crosslinkable polysiloxane preferably selected from the group consisting of addition-crosslinking, preferably metal-catalyzed addition-crosslinking; condensation-crosslinking, free-radically crosslinking, and/or cationically crosslinking polysi
  • Suitable polysiloxanes are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFFTM from Dow Chemical, or under the trade name SilcoleaseTM from Elkem Silicones.
  • the reactive diluent of the matrix compatible with the silicone composition is preferably selected from the group consisting of hexanediol diacrylate (HDDA), dipentaerythritol hexaacrylate (DPHA), tripropylene glycol diacrylate (TPGDA), pentaerythritol triacrylate (PETA), pentaerythritol tetraacrylate, neopentyl glycol diacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate (HEMA ), bis-[methacryloyloxy]-ethyl]-phosphate, glycidyl acrylates, and glycidyl methacrylates.
  • the photoinitiator of the matrix compatible with the silicone composition is preferably selected from the group consisting of ⁇ -hydroxy, ⁇ -alkoxy or ⁇ -amino aryl ketones, acylphosphine oxides, aliphatic azo compounds, onium compounds or platinum compounds.
  • Suitable photoinitiators are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFFTM from Dow Chemical, or under the trade name SilcoleaseTM from Elkem Silicones.
  • the adjuvant preferably accelerates the curing of the silicone composition; preferably the adjuvant catalyzes the curing of the silicone composition.
  • the at least one optical property is preferably dependent on the release coating
  • the at least one optical property is preferably selected from transparency, opacity, opacity, transparency, color, hue, color brightness, color saturation, color contrast, luminance, relative luminance, luminance, refractive index, reflection, gloss, and/or gray values.
  • the at least one optical property is particularly preferably a light/dark contrast.
  • the light-dark contrast is preferably a contrast between black, white and/or shades of gray.
  • the light-dark contrast is preferably a contrast between two colors, with the colors preferably differing in their brightness.
  • the two colors are selected from all colors except black and white.
  • the backing film is violet in color and the silicone composition, and thus also the release coating, is yellow in color.
  • the optical property is preferably the contrast between uncoated violet areas of the release film and yellow areas of the release film with an optionally cured release coating.
  • the carrier film has a white-beige coloration and the silicone composition and thus also the release coating has a blue, black and/or violet coloration.
  • the optical property is preferably the contrast between uncoated white-beige areas of the release film and blue, black and/or violet areas of the release film with an optionally cured release coating.
  • the release coating preferably has an application weight
  • g/m 2 at least 0.1 g/m 2 ; preferably at least 0.15 g/m 2 , more preferably at least 0.2 g/m 2 , even more preferably at least 0.25 g/m 2 , most preferably at least 0.3 g/m 2 , and especially at least 0.35 g/m 2 square meters;
  • 0.1 g/m 2 in the range from 0.1 g/m 2 to 1.0 g/m 2 ; preferably in the range of 0.2 ⁇ 0.1 g/m 2 , or 0.3 ⁇ 0.2 g/m 2 , or 0.3 ⁇ 0.1 g/m 2 , or 0.4 ⁇ 0.3 g /m 2 , or 0.4 ⁇ 0.2 g/m 2 , or 0.4 ⁇ 0, 1 g/m 2 , or 0.5 ⁇ 0.4 g/m 2 , or 0.5 ⁇ 0, 3 g/m 2 , or 0.5 ⁇ 0.2 g/m 2 , or 0.5 ⁇ 0.lg/m 2 , or 0.6 ⁇ 0.4 g/m 2 , or 0.6 ⁇ 0 .3 g/m 2 , or 0.6 ⁇ 0.2 g/m 2 , or 0.6 ⁇ 0.lg/m 2 , 0.7 ⁇ 0.3 g/m 2 , or 0.7 ⁇ 0 .2 g/m 2 , or 0.7 ⁇ 0.lg/m 2 , or 0.8 ⁇
  • the coat weight of the release coating is the dry coat weight, i.e. the weight that the release coating has without volatile components such as solvents.
  • the release coating preferably has a layer thickness
  • - in the range of 0.1 to 4.0 pm preferably in the range of 0.5 ⁇ 0.25 pm, or 1.0 ⁇ 0.5 pm, or 1.0 ⁇ 0.25 pm, or 1.5 ⁇ 1.0 pm, or 1.5 ⁇ 0, 5 pm, or 1.5 ⁇ 0.25 pm, or 2.0 ⁇ 1.5 pm, or 2.0 ⁇ 1.0 pm, or 2.0 ⁇ 0.5 pm, or 2.0 ⁇ 0, 25 pm, or 2.5 ⁇ 1.5 pm, or 2.5 ⁇ 1.0 pm, or 2.5 ⁇ 0.5 pm, or 2.5 ⁇ 0.25 pm, or 3.0 ⁇ 1.0 pm, or 3.0 ⁇ 0.5 pm, or 3.0 ⁇ 0.25 pm, or 3.5 ⁇ 0.5 pm, or 3.5 ⁇ 0.25pm.
  • the release coating preferably comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.
  • the release coating preferably comprises at least one chemically crosslinked polysiloxane; preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.
  • the release coating preferably comprises the adjuvant.
  • the release coating preferably in combination with the microembossing of the release film, preferably has average release values in the range from 2.0 to 25 cN/cm compared to a test adhesive tape TESA® 7475 from Beiersdorf, preferably determined according to FINAT test method no. 10 .
  • the release coating preferably in combination with the micro-embossing of the release film, preferably has maximum release values in the range from 2.0 to 40 cN/cm compared to a test adhesive tape TESA® 7475 from Beiersdorf, preferably determined according to FINAT test method no. 10 .
  • the method according to the invention serves to produce a separating film and/or to detect production defects in a separating film.
  • step (e) of the method according to the invention at least one optical property of the release coating is determined at positions within the area in which a release coating is to be applied in order to detect production defects in the release coating.
  • the production defects in the release coating preferably differ at least in terms of the type of defect, the size of the defect and/or the position of the defect.
  • the production defects of the release coating are preferably selected from
  • Acceptable production errors are preferably those which do not impair the general properties of the release film according to the invention and/or are below a defined threshold value; the general properties are preferably functionality, optics and/or haptics of the release film.
  • Sections of the separating film which have acceptable production errors, which may have been marked in step (f) of the method according to the invention, are preferably not sorted out in step (h) of the method according to the invention.
  • Unacceptable production errors are preferably those which disturb the general properties of the release film according to the invention and/or are above a defined threshold value. Sections of the separating film which have unacceptable production errors, which may have been marked in step (f) of the method according to the invention, are preferably sorted out. Unacceptable production errors are preferably large areas of the release film according to the invention which are intended for application of the release coating but have a missing and/or insufficiently applied release coating.
  • Possible causes of the production errors are preferably selected from
  • the distances between the production errors preferably correlate with the scope of the commissioned work
  • step (d) Too high an oxygen content of a protective gas atmosphere under which the curing of the silicone composition in step (d) takes place; too high production speed;
  • Step (a) of the method according to the invention preferably additionally comprises the surface activation of at least that region which is intended for application of the release coating, of the first surface side of the carrier film provided in (a).
  • the surface activation is preferably carried out by a pretreatment with plasma or corona.
  • the silicone composition can be used as a finished product or can be produced by mixing the components just before the process is carried out.
  • the silicone composition is preferably applied in step (c) of the method according to the invention by means of a printing method; preferably a flexographic printing process.
  • the silicone composition is preferably applied in step (c) with more than one pressure roller; preferably with two pressure rollers, which are preferably passed through one after the other.
  • a first silicone composition and a second silicone composition are applied sequentially; preferably wherein the first and the second silicone composition differ at least in the excipient.
  • step (d) of the method according to the invention comprises evaporating at least part of the solvent; preferably evaporating the solvent prior to curing of the silicone composition.
  • step (d) preferably takes place at a temperature
  • At least 30 °C preferably at least 40°C, more preferably at least 50°C, even more preferably at least 60°C, most preferably at least 70°C, and especially at least 80°C;
  • step (d) The evaporation of the solvent in step (d) is preferably carried out at a pressure
  • At least 100 mbar preferably at least 150 mbar, more preferably at least 200 mbar, even more preferably at least 250 mbar, most preferably at least 300 mbar, and especially at least 350 mbar;
  • - in the range from 100 mbar to 900 mbar preferably in the range of 150 ⁇ 50 mbar, or 200 ⁇ 50 mbar, or 250 ⁇ 50 mbar, or 300 ⁇ 50 mbar, or 350 ⁇ 50 mbar, or 400 ⁇ 50 mbar, or 450 ⁇ 50 mbar, or 500 ⁇ 50 mbar , or 550 ⁇ 50 mbar, or 600 ⁇ 50 mbar, or 650 ⁇ 50 mbar, or 700 ⁇ 50 mbar, or 750 ⁇ 50 mbar, or 800 ⁇ 50 mbar, or 850 ⁇ 50 mbar.
  • Step (d) preferably comprises evaporating the solvent until it is odorless.
  • the solvent is preferably evaporated in step (d) down to a residual solvent content of at most 100 ppmw; preferably at most 80 ppmw, more preferably at most 60 ppmw, even more preferably at most 40 ppmw, most preferably at most 20 ppmw, especially completely (0 ppmw).
  • the silicone composition is preferably cured in step (d) by irradiating the silicone composition with UV radiation and/or with electron beams; preferably UV radiation.
  • the silicone composition is preferably irradiated in step (d)
  • the silicone composition is preferably irradiated in step (d) at one wavelength
  • At least 170 nm preferably at least 190 nm, more preferably at least 210 nm, even more preferably at least 230 nm, most preferably at least 250 nm, and especially at least 270 nm;
  • nm in the range from 170 nm to 400 nm; preferably in the range of 190 ⁇ 20 nm, or 200 ⁇ 20 nm, or 210 ⁇ 20 nm, or 220 ⁇ 20 nm, or 230 ⁇ 20 nm, or 240 ⁇ 20 nm, or 250 ⁇ 20 nm, or 260 ⁇ 20 nm , or 270 ⁇ 20 nm, or 280 ⁇ 20 nm, or 290 ⁇ 20 nm, or 300 ⁇ 20 nm, or 310 ⁇ 20 nm, or 320 ⁇ 20 nm, or 330 ⁇ 20 nm, or 340 ⁇ 20 nm, or 350 ⁇ 20 nm, or 360 ⁇ 20 nm, or 370 ⁇ 20 nm, or 380 ⁇ 20 nm.
  • the silicone composition is preferably irradiated in step (d) with an energy
  • At least 3.0 eV preferably at least 4.0 eV, more preferably at least 5.0 eV, even more preferably at least 6.0 eV, most preferably at least 7.0 eV, and especially at least 8.0 eV;
  • eV in the range from 3.0 eV to 12 eV; preferably in the range of 5.0 ⁇ 2.0 eV, or 6.0 ⁇ 2.0 eV, or 7.0 ⁇ 2.0 eV, or 8.0 ⁇ 2.0 eV, or 9.0 ⁇ 2, 0 eV, or 10 ⁇ 2.0 eV.
  • the irradiation of the silicone composition in step (d) preferably takes place under a protective gas atmosphere; the protective gas atmosphere preferably comprises essentially nitrogen.
  • the curing of the silicone composition in step (d) preferably takes place thermally; preferably at a temperature
  • the silicone composition comprises a photoinitiator and at least one chemically crosslinkable polysiloxane, preferably an acrylate-functionalized polysiloxane chemically crosslinkable by UV radiation.
  • the silicone composition is cured in step (d) by exposure to UV radiation.
  • the silicone composition comprises at least one chemically crosslinkable polysiloxane, preferably a chemically crosslinkable acrylate-functionalized polysiloxane, and no photoinitiator.
  • the silicone composition is cured in step (d) by irradiation with electron beams.
  • the silicone composition comprises a catalyst, preferably a platinum compound, and a chemically crosslinkable polysiloxane, preferably a metal-catalyzed addition-crosslinking polysiloxane.
  • the silicone composition is cured thermally.
  • Step (e) of the method according to the invention preferably comprises the recording of measured values relating to the at least one optical property of the release coating at positions within the area with a possibly cured release coating.
  • the measured values are preferably recorded with the aid of an optical measuring device; preferably using a camera system; most preferably with a linear CCD camera.
  • a camera system most preferably with a linear CCD camera.
  • Suitable camera systems are commercially available, e.g. under the designation LINE CAM 8000 HS (Dr. Schenk).
  • the camera has a resolution in the range 50 to 200 pm and more preferably 75 to 150 pm; the camera particularly preferably has a resolution of 100 ⁇ m.
  • the optical measuring device preferably measures in the visible wavelength range, in the infrared wavelength range and/or in the ultraviolet wavelength range; preferably in the visible wavelength range.
  • the detection of production defects in the release coating is preferably based on the in
  • step (e) recorded readings; preferred (i) on the basis of the difference between two or more measured values which were recorded at different positions within the area with a possibly cured release coating;
  • the reference value is preferably determined by means of an X-ray measuring method; preferably by X-ray fluorescence analysis.
  • the detection of production errors in the release coating in step (e) preferably takes place in a computer-implemented manner.
  • Step (e) preferably comprises illuminating the area with optionally cured release coating with light in the visible wavelength range, in the infrared wavelength range and/or in the ultraviolet wavelength range.
  • the illumination is preferably carried out by oblique light; whereby the measurement values are preferably recorded in bright field and/or in dark field.
  • the illumination preferably takes place by incident light; whereby the measurement values are preferably recorded in bright field and/or in dark field.
  • the illumination preferably increases the differences between two or more measured values which were recorded at different positions within the area with a possibly cured release coating.
  • the illumination preferably increases contrast differences, brightness differences and/or gloss differences between two or more measured values which were recorded at different positions within the area with a possibly cured release coating.
  • Step (c), step (e) and, if appropriate, step (f) of the process according to the invention preferably take place simultaneously.
  • the marking of the production errors of the release coating in step (f) of the method according to the invention is preferably carried out by means of electronic data processing.
  • a log is preferably created during the detection of production errors in step (e) of the method according to the invention.
  • the protocol preferably assigns at least the type of error, the size of the error and/or the position of the error to each production error in the release coating.
  • a threshold value is preferably defined for the extent and/or number of production errors.
  • the threshold value for production defects with a missing and/or insufficiently applied release coating is preferably 1 per 10 m 2 .
  • measures are preferably taken to eliminate the cause of the production error.
  • the measures for eliminating the cause of the production errors are preferably selected from
  • step (c) removing a foreign body on an application unit with which the application of the silicone composition in step (c) takes place; preferably for avoiding periodically recurring production errors in which the release coating is missing and/or insufficiently applied;
  • step (c) adjusting the viscosity of the silicone composition; preferably to avoid large-area production errors in which the release coating has coating weights that are too low and/or too high; preferably by modifying the solvent content and/or the temperature at which the silicone composition is applied in step (c);
  • step (d) Reduction of the oxygen content of a protective gas atmosphere under which the curing of the silicone composition in step (d) takes place; preferably to avoid production errors in which the release coating is not and/or not fully cured; preferred by adjusting the gap dimensions through which the separating film (1) reaches the area of the protective gas atmosphere.
  • step (d) increasing the power of a UV lamp used in step (d) to cure the silicone composition; preferably to avoid production errors in which the release coating is not and/or not fully cured;
  • the application of the silicone composition in step (c) and/or the curing of the silicone composition in step (d) of the method according to the invention is preferably interrupted if the threshold value is exceeded until the cause of the production error has been eliminated.
  • the interruption preferably takes place automatically or intentionally.
  • the production errors of the release coating are preferably marked in step (f) of the method according to the invention by means of a colored marking of the production errors.
  • the colored marking of the production errors is preferably carried out in addition to the electronic data processing.
  • the colored marking preferably makes it easier to later find production errors in the release coating within the release film.
  • the marking of the production errors of the release coating in step (f) of the method according to the invention is preferably carried out in a computer-implemented manner.
  • At least one printing area of the opposite second surface side is printed in step (g) by means of scattered printing; preferably in the form of a decorative print or a register print.
  • the pressure applied to the second surface side can preferably be seen on the opposite side through the release coating.
  • the pressure is preferably applied spatially offset to the release coating on the second surface side.
  • the pressure is preferably applied to the second surface side exactly opposite the release coating.
  • the print preferably has a color that is produced by a colorant.
  • the color of the print matches the color of the release coating.
  • the auxiliary is a colorant and the same colorant is preferably used to produce the color of the print.
  • the print is a different color than the release coating.
  • the auxiliary is a colorant and to produce the color of the print, a colorant is preferably used which differs from the auxiliary in that it produces a different color.
  • the printing area includes the opposite second surface side
  • Sections of the separating film that have production defects that may have been marked in step (f) are preferably sorted out by cutting the separating film.
  • Step (h) of the method according to the invention preferably comprises a rewinding process.
  • the separating film is preferably on a roll and can be transferred to another roll by a rewinding process. Sections of the separating film which have production errors and are sorted out in step (h) of the method according to the invention are preferably located at the beginning and/or at the end of the roll.
  • Step (h) of the method according to the invention preferably comprises the identification and cutting out of sections of the separating film which have production errors.
  • a further aspect of the invention relates to a release film comprising a carrier film which comprises a first surface side, an opposite second surface side and an area which has a release coating; where the release film
  • - has a total layer thickness in the range from 10 to 25 ⁇ m;
  • - is micro-embossed and has a total embossed layer thickness in the range of 30 to 60 ⁇ m; and wherein the release coating
  • - has an application weight of no more than 1.0 g/m 2 ; preferably at most 0.6 g/m 2 , more preferably at most 0.5 g/m 2 ;
  • auxiliary substance that can be detected by optical means, the auxiliary substance influencing the optical properties of the release coating in such a way that production defects can be identified.
  • the adjuvant is preferably a particulate non-spherical pigment.
  • the excipient is preferably spatially anisotropically aligned.
  • the release film of the present invention can be produced by the method of the present invention described above. All preferred embodiments according to the invention which have already been described above for the method according to the invention also apply analogously to the release film and will not be repeated at this point.
  • a further aspect of the invention relates to a preferably curable silicone composition
  • the content of the solvent is preferably at least 45% by weight, based on the total weight of the silicone composition; preferably at least 50% by weight, more preferably at least 55% by weight, even more preferably at least 60% by weight, most preferably at least 65% by weight, and especially at least 70% by weight; - at most 95% by weight relative to the total weight of the silicone composition; preferably at most 90% by weight, more preferably at most 85% by weight, even more preferably at most 80% by weight, most preferably at most 75% by weight, and especially at most 70% by weight; and or
  • - ranges from 45 to 95% by weight relative to the total weight of the silicone composition; preferably in the range of 50 ⁇ 5.0% by weight, or 55 ⁇ 10% by weight, or 55 ⁇ 5.0% by weight, or 60 ⁇ 15% by weight, or 60 ⁇ 10% by weight %, or 60 ⁇ 5.0% by weight, or 65 ⁇ 20% by weight, or 65 ⁇ 15% by weight, or 65 ⁇ 10% by weight, or 65 ⁇ 5.0% by weight , or 70 ⁇ 25% by weight, or 70 ⁇ 20% by weight, or 70 ⁇ 15% by weight, or 70 ⁇ 10% by weight, or 70 ⁇ 5.0% by weight, or 75 ⁇ 20% by weight, or 75 ⁇ 15% by weight, or 75 ⁇ 10% by weight, or 75 ⁇ 5.0% by weight, or 80 ⁇ 15% by weight, or 80 ⁇ 10% by weight %, or 80 ⁇ 5.0% by weight.
  • the adjuvant is preferably a particulate non-spherical pigment.
  • the silicone composition of the present invention can be used in the method of the present invention. All preferred embodiments according to the invention which have already been described above for the method according to the invention also apply analogously to the silicone composition and will not be repeated at this point.
  • a further aspect of the invention relates to a packaged item made from the above-described separating film according to the invention; preferably suitable for packaging individually packaged hygiene products.
  • a further aspect of the invention relates to the use of the release film according to the invention as described above as a detachable release and/or protective film for adhesive hygiene articles.
  • FIG. 1 schematically illustrates the method according to the invention, with different stages of the method being shown in FIGS. 1A to 1E.
  • Figure 1A shows the carrier film (2), which includes the first surface side (3) and the area (5) which is provided for applying the release coating (6a/b).
  • FIG. 1B shows the release film (1), which includes an area (5a/b) with an applied and possibly cured release coating (6a/b).
  • Figure IC shows the release film (1), which includes an area (5a/b) with an applied and optionally cured release coating (6a/b), the release coating (6a/b) having a production error (7).
  • Figure ID shows the release film (1), which includes an area (5a/b) with an applied and optionally cured release coating (6a/b), the release coating (6a/b) having a production error (7).
  • the print area (8) of the opposite, second surface side (4) is shown.
  • Figure IE shows the release film (1), which includes an area (5a/b) with an applied and possibly cured release coating (6a/b), the release coating (6a/b) having a production defect (7).
  • the pressure area (8) of the opposite, second surface side (4) is shown with pressure applied.
  • FIG. 2 shows the release film (1), which includes an area (5a/b) with an applied and optionally cured release coating (6a/b), the release coating (6a/b) not having any production errors (7).
  • the pressure area (8) of the opposite, second surface side (4) is shown with pressure applied.
  • Example 1 An exemplary silicone composition according to the invention is summarized in the following table and can be prepared by subsequently mixing the ingredients:

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Abstract

L'invention concerne un procédé de fabrication d'un film de support revêtu d'une composition de silicone. Le procédé permet l'identification de défauts de production pendant l'opération de revêtement en cours. À cet effet, une composition de silicone est appliquée sur un côté de surface du film de support et comprend une substance auxiliaire qui est détectable par des moyens optiques, ce par quoi un revêtement antiadhésif qui contient la substance auxiliaire est obtenu. Une propriété optique du revêtement antiadhésif est ensuite déterminée afin d'identifier des défauts de production dans le revêtement antiadhésif, la propriété optique dépendant de la substance auxiliaire. Le film peut ensuite être imprimé sur le côté de la surface opposée.
PCT/EP2022/080643 2021-11-04 2022-11-03 Identification de défauts de silicone pendant une opération de revêtement en cours de fonctionnement WO2023078980A1 (fr)

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