EP4519083A1 - Article apte au contact alimentaire et son procédé de fabrication - Google Patents
Article apte au contact alimentaire et son procédé de fabricationInfo
- Publication number
- EP4519083A1 EP4519083A1 EP23727397.4A EP23727397A EP4519083A1 EP 4519083 A1 EP4519083 A1 EP 4519083A1 EP 23727397 A EP23727397 A EP 23727397A EP 4519083 A1 EP4519083 A1 EP 4519083A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- silicone
- substrate
- adhesive
- silicone composition
- food contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
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- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
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- B32B29/00—Layered products comprising a layer of paper or cardboard
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- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
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- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
- B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/42—Applications of coated or impregnated materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
- C09D5/1675—Polyorganosiloxane-containing compositions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives 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; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
- B32B2037/243—Coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
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- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/06—Coating on the layer surface on metal layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/12—Coating on the layer surface on paper layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/028—Paper layer
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- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/58—Cuttability
- B32B2307/581—Resistant to cut
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/582—Tearability
- B32B2307/5825—Tear resistant
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- B32B2317/00—Animal or vegetable based
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- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/28—Presence of paper
- C09J2400/286—Presence of paper in the pretreated surface to be joined
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2483/00—Presence of polysiloxane
- C09J2483/008—Presence of polysiloxane in the pretreated surface to be joined
Definitions
- TITLE Article suitable for food contact and its manufacturing process
- the present invention relates to the field of food packaging, and more precisely to food packaging based on a silicone substrate.
- silicone papers typically used in pastry making and commonly called baking paper or parchment paper. These papers consist of a paper base (cellulose) having particular porosity and roughness properties and having a weight of approximately 40 g/m 2 as well as a thin layer of silicone coated on one or both sides of the paper. this paper and having a thickness of between 0.1 pm and 1 pm. These silicone papers are suitable for food contact. They are non-stick and water-repellent: food does not stick to their packaging even after a storage period of one year or more at temperatures as low as -30°C, or even as low as -70°C. . They can withstand, without disintegrating, the constraints of rapid cooking techniques for frozen foods (temperature of around 300°C in microwave ovens, steam cooking). They are therefore interesting candidates for the manufacture of food packaging.
- the manufacturing of food packaging involves one or more assembly steps to create the sides and bottom of a bag, for example. These assembly steps can be carried out in the case of papers coated with a polyolefin coating, either by reusing an adhesive, or by a fusion welding step of the surface plastic layer.
- a difficulty in reusing silicone paper for the manufacture of food packaging lies in the bonding step on the silicone surface(s).
- the subject of the present invention is an article suitable for food contact, in particular food packaging, which preferably meets the following needs: we wish to have an article not comprising a petroleum-sourced polymer coating, capable of resistant to significant thermal amplitudes, having water barrier properties, waterproof, particularly in the assembly areas, and whose manufacturing is possible at high speed, preferably with standard industrial tools in the field of packaging.
- the article suitable for food contact comprises a first substrate and a second substrate joined by an adhesive, said first substrate comprising a support coated with a silicone coating suitable for food contact, said adhesive being inserted between the two substrates and being in contact with the silicone coating of said first substrate, characterized in that said adhesive is a structural silicone adhesive, suitable for food contact obtained by crosslinking a silicone composition crosslinkable by polyaddition reaction.
- the present invention also relates to a process for manufacturing an article suitable for food contact, said process comprising the steps consisting of:
- first substrate comprising a support coated with a silicone coating suitable for food contact
- the present invention also relates to the use of a structural silicone adhesive, suitable for food contact, obtained by crosslinking a silicone composition crosslinkable by polyaddition reaction for the manufacture of an article suitable for food contact.
- the present invention therefore relates to an article suitable for food contact comprising a first substrate and a second substrate joined by an adhesive.
- Said adhesive is a structural silicone adhesive.
- an adhesive can be qualified as “structural” as long as said adhesive is not the weak point of said assembly.
- the structural silicone adhesive as defined in the present invention is not a PSA (pressure sensitive adhesive).
- a PSA forms a bond with a substrate simply by contact or by applying light pressure to join the adhesive with the substrate surface. Physical bonds are created because the PSA adhesive is soft enough to wet the substrate surface, but also hard enough to resist flow when pressure is applied to the bonding area. When the adhesive and substrate surface are in close proximity, Van Der Waals-type molecular interactions can contribute significantly to bond strength.
- a PSA therefore forms a physical and non-chemical bond with the surface of the substrate.
- a chemical bond can be defined as a bond between reactive chemical groups at the adhesive-substrate interface.
- a physical bond can be defined as a non-chemical, temporary or reversible bond created by a physical interaction between the adhesive and the substrate.
- PSA silicone compositions generally consist of a hydroxylated silicone resin of the MQ(OH) type and a linear silicone gum in solution in an organic solvent, typically toluene and/or xylene.
- the structural silicone adhesive according to the present invention which is not a PSA, can form a chemical bond with the substrate, and can thus guarantee good adhesion between two substrates.
- the rupture between the two substrates assembled with the structural silicone adhesive according to the present invention is a cohesive rupture.
- the expression “cohesive failure” designates the failure which occurs in the body of the material, as opposed to the “adhesive failure” which occurs at the interface between the adhesive and the substrate.
- the silicone adhesive according to the present invention must be suitable for food contact.
- the suitability of an object for food contact, in the field of food packaging, means that the material of which it is made meets regulatory or normative requirements guaranteeing that there is no risk of induced toxicity, for food or drinks, by this object.
- the materials used must not release constituents to foods in quantities likely to present a danger to human health or to cause an unacceptable modification of the composition of the foodstuffs with or without an alteration of the organoleptic characteristics of the food.
- the silicone adhesive according to the present invention which is not a PSA, is obtained by crosslinking a silicone composition crosslinkable by polyaddition reaction.
- a silicone composition crosslinkable by polyaddition reaction comprising:
- At least one organopolysiloxane A having, per molecule, at least two C2-C12 alkenyl groups linked to silicon
- Organopolysiloxane A having, per molecule, at least two alkenyl groups, C2-C12 linked to silicon, can preferably be a linear organopolysiloxane formed:
- Y represents a C2-C12 alkenyl group, preferably a vinyl group
- R 1 represents a monovalent hydrocarbon group having from 1 to 12 carbon atoms, preferably chosen from alkyl groups having from 1 to 8 carbon atoms such as methyl, ethyl, propyl groups, cycloalkyl groups having from 3 to 8 atoms carbon and aryl groups having 6 to 12 carbon atoms
- a 1 or 2
- R 1 c SiO(4-o/2 in which R 1 has the same meaning as above and c 2 or 3.
- said organopolysiloxanes A are oils with a dynamic viscosity of between 100 mPa.s and 100,000 mPa.s, preferably between 1000 mPa.s and 100,000 mPa.s.
- the silicone composition according to the present invention does not comprise linear silicone gum.
- the linear organopolysiloxane A having, per molecule, at least two alkenyl groups, C2-C12 linked to silicon can preferably consist essentially of siloxyl units “D” chosen from the group consisting of the siloxyl units R ⁇ SiCLa, YR 1 SiO2/2 and Y 2 SiO2/2, and patterns terminal “M” siloxyls chosen from the group consisting of the siloxyl units YR ⁇ SiOi ⁇ , Y2R 1 SiOi/2 and R';SiOi 2.
- the symbols Y and R 1 are as described above.
- terminal “M” units mention may be made of trimethylsiloxy, dimethylphenylsiloxy, dimethylvinylsiloxy or dimethylhexenylsiloxy groups.
- D units mention may be made of dimethylsiloxy, methylphenylsiloxy, methylvinylsiloxy, methylbutenylsiloxy, methylhexenylsiloxy, methyldecenylsiloxy or methyldecadienylsiloxy groups.
- linear organopolysiloxanes which can be organopolysiloxanes A according to the invention are:
- organopolysiloxane A contains terminal dimethylvinylsilyl units and even more preferably organopolysiloxane A is a poly(dimethylsiloxane) with dimethylvinylsilyl ends.
- the organopolysiloxane compound A has a mass content of alkenyl unit of between 0.001% and 30%, preferably between 0.01% and 10%, preferably between 0.02% and 5%.
- the silicone composition preferably comprises from 50% to 95% by weight of organopolysiloxane A, even more preferably from 60% to 90% by weight of organopolysiloxane A.
- the silicone composition according to the present invention contains a branched organopolysiloxane or resin comprising C2-C12 alkenyl units.
- Branched organopolysiloxanes also called resins, contain “T” siloxyl units (R 1 SiCLn) and/or “Q” siloxyl units (SiOj 2).
- R 1 are as described above.
- Examples of branched organopolysiloxanes are:
- the silicone composition does not comprise branched organopolysiloxanes or resins comprising C2-C12 alkenyl units.
- the silicone composition according to the invention comprises at least one organopolysiloxane having, per molecule, two SiH units, and at least one organopolysiloxane having, per molecule, three or more SiH units.
- the silicone composition comprises at least one linear organopolysiloxane B having, per molecule, at least two SiH units and one organopolysiloxane B having a branched structure like a silicone resin.
- R 2 group may be the same or different from each other.
- R 2 may represent a monovalent radical chosen from the group consisting of alkyl groups having 1 to 8 carbon atoms, optionally substituted by at least one halogen atom such as chlorine or fluorine, cycloalkyl groups having 3 with 8 carbon atoms and aryl groups having 6 to 12 carbon atoms.
- R 2 can advantageously be chosen from the group consisting of methyl, ethyl, propyl, 3,3,3-trifluoropropyl, xylyl, tolyl and phenyl.
- the symbol d is preferably equal to 1.
- Organopolysiloxane B can have a linear, branched, or cyclic structure.
- the degree of polymerization is preferably greater than or equal to 2. Generally, it is less than 5000.
- the viscosity of the organopolysiloxane B is between 1 mPa.s and 5000 mPa.s, more preferably between 1 mPa. s and 2000 mPa.s, and even more preferably between 5mPa.s and 1000 mPa.s.
- linear organohydrogenopolysiloxanes which can be compounds B according to the invention are:
- the organopolysiloxane B according to the silicone composition of the invention comprises a linear organohydrogenopolysiloxane or several linear organohydrogenopolysiloxanes in mixtures.
- the organopolysiloxane B according to the silicone composition of the invention comprises an organohydrogenopolysiloxane B which is a poly(dimethylsiloxane-co-methylhydrogensiloxane) with hydrogenodimethylsilyl ends and an organohydrogenopolysiloxane B which is a poly(methylhydrogensiloxane) with trimethylisilyl ends .
- organohydrogenopolysiloxane B has a branched structure
- it is preferably chosen from the group consisting of the silicone resins of the following formulas:
- M siloxyl unit of formula R 2 3SiOi/2
- M' siloxyl unit of formula R 2 2HSiOi/2
- D siloxyl unit of formula R 2 2Si ⁇ 2/2
- D' siloxyl unit of formula R 2 HSiC>2/2
- T siloxyl unit of formula R 2 3SiOi/2
- Q siloxyl unit of formula SiOjn- where R 2 has the same meaning as above.
- the organopolysiloxane B according to the silicone composition of the invention comprises one or more linear organohydrogenopolysiloxane in mixtures, and a silicone resin.
- the organopolysiloxane B according to the silicone composition of the invention comprises an organohydrogenopolysiloxane B which is a poly(dimethylsiloxane-co-methylhydrogensiloxane) with hydrogenodimethylsilyl ends, an organohydrogenopolysiloxane B which is a poly(methylhydrogensiloxane) with trimethylisilyl ends and a silicone resin.
- organopolysiloxane B has a mass content of Si-H hydrogenosilyl functions of between 0.2% and 91%, more preferably between 3% and 80% and even more preferably between 15% and 70%.
- the molar ratio of the Si-H hydrogenosilyl functions of the organopolysiloxanes B to the alkene functions of the organopolysiloxanes A is between 0.01 and 20, preferably between 0.1 and 10, preferably between 0.5 and 5, more preferably between 1 and 5, and even more preferably between 1 and 3.
- the silicone composition according to the invention preferably comprises from 0.1% to 20% by weight, more preferably from 0.1% to 10%, and even more preferably from 0.5% to 5% by weight, of organopolysiloxane. b.
- the hydrosilylation catalyst C may in particular be chosen from platinum and rhodium compounds but also from silicon compounds such as those described in patent applications WO 2015/004396 and WO 2015/004397, germanium compounds such as those described in patent applications WO 20160/75414 or nickel, cobalt or iron complexes such as those described in patent applications WO 2016/071651, WO 2016/071652 and WO 2016/071654.
- Catalyst C is preferably a compound derived from at least one metal belonging to the platinum group. These catalysts are well known.
- catalyst C is a compound derived from platinum.
- the weight quantity of catalyst C, calculated in weight of platinum metal is generally between 2 ppm and 400 ppm by mass, more preferably between 50 ppm and 300 ppm, and even more preferably between 70 ppm. and 200 ppm, based on the total weight of the silicone composition.
- the weight quantity of catalyst C, calculated in weight of platinum metal can be between 5 ppm and 200 ppm by mass, more preferably between 20 ppm and 200 ppm,
- the catalyst C is a Karstedt platinum.
- the silicone composition according to the invention may optionally contain a crosslinking inhibitor D.
- Crosslinking inhibitors are designed to slow down the crosslinking reaction and are also called retarders.
- Crosslinking inhibitors are well known in the prior art. Mention may be made, for example, of cyclic polymethylvinylsiloxanes and acetylenic alcohols described in US patent 3,923,705, acetylenic alcohols described in US patent 3,445,420, heterocyclic amines described in US patent 3,188,299, diallyl maleate and other di-alkyl esters described in US Pat.
- mercaptans organic nitrogen compounds, acetylenic alcohols, silylated acetylenic alcohols, maleates, fumarates, ethylenically unsaturated or aromatic amides, ethylenically unsaturated isocyanates, olefinic siloxanes, unsaturated hydrocarbon monoesters and diesters, conjugated enene-ynes, hydroperoxides , nitriles and diaziridines.
- the crosslinking inhibitor D is preferably chosen from 1,3,5,7-tetramethyl-1,3,5,7-tetravinyl-cyclotetrasiloxane, 1-ethynyl-l-cyclohexanol (ECH), 3-methyl -l-butyn-3-ol, 2-methyl-3-butyn-2-ol, 3-butyn-l-ol, 3-butyn-2-ol, propargyl alcohol, 2-phenyl- 2-propyn-l-ol, 3,5-dimethyl-l-hexyn-3-ol, 1-ethynylcyclopentanol, l-phenyl-2-propynol, 3-methyl-l-penten-4-yn- 3-ol, 3-methyl-l-dodecyn-3-ol, 3,7,l l-trimethyl-l-dodecyn-3-ol, diphenyl-l,l-propyne-2-ol-l, 3,6-die
- the silicone composition crosslinkable by polyaddition reaction may optionally comprise a filler.
- the silicone composition comprises between 5% and 40% by weight of filler relative to the total weight of the silicone composition.
- the silicone composition comprises between 10% and 30% by weight of filler.
- the possible filler is preferably mineral.
- the filler may be a very finely divided product whose average particle diameter is less than 0.1 pm.
- the filler may in particular be siliceous. Regarding siliceous materials, they can play the role of reinforcing or semi-reinforcing filler.
- the reinforcing siliceous fillers are chosen from colloidal silicas, combustion and precipitation silica powders or mixtures thereof. These powders have an average particle size generally less than 0.1 pm (micrometers) and a BET specific surface area greater than 30 m 2 /g, preferably between 30 m 2 /g and 350 m 2 /g.
- Semi-reinforcing siliceous fillers such as diatomaceous earth or crushed quartz can also be used.
- silicas can be incorporated as is or after having been treated with organosilicic compounds usually used for this use.
- organosilicic compounds usually used for this use.
- these compounds are methylpolysiloxanes such as hexamethyldisiloxane, octamethylcyclotetrasiloxane, methylpolysilazanes such as hexamethyldisilazane, hexamethylcyclotrisilazane, tetramethyldivinyldisilazane, chlorosilanes such as dimethyldichlorosilane, trimethylchlorosilane, methylvinyldichlorosilane, di methylvinylchlorosilane, alkoxysilanes such as dimethyldimethoxysilane, dimethylvinylethoxysilane, trimethylmethoxysilane, and mixtures thereof.
- non-siliceous mineral materials they can be used as semi-reinforcing or filler mineral fillers.
- these non-siliceous fillers which can be used alone or in a mixture are calcium carbonate, optionally treated on the surface with a organic acid or by an ester of an organic acid, calcined clay, titanium oxide of the rutile type, oxides of iron, zinc, chromium, zirconium, magnesium, the different forms of alumina ( hydrated or not), boron nitride, lithopone, barium metaborate, barium sulfate and glass microbeads.
- These fillers are coarser with generally an average particle diameter greater than 0.1 pm and a specific surface area generally less than 30 m 2 /g. These fillers may have been modified on the surface by treatment with the various organosilicon compounds usually used for this use.
- the filler is silica, and even more preferably combustion silica.
- the silica has a BET specific surface area of between 75 m 2 /g and 410 m 2 /g.
- the silicone composition according to the present invention may also comprise other functional additives usual in silicone compositions.
- functional additives usual in silicone compositions.
- adhesion promoters adhesion modulators
- additives to increase consistency thermal resistance
- oil resistance or fire resistance additives for example metal oxides, virucides, bactericides, anti-abrasion additives, and pigments (organic or mineral).
- silicone compositions are not compatible with use for food contact. It is therefore preferable that the silicone composition does not contain any additional additive.
- an adhesion promoting compound may be an organosilicon compound comprising an adhesion promoting functional group.
- it may be an organosilicic compound comprising:
- organic groups chosen from mercaptan groups, the urea group, the isocyanurate group, (meth)acrylate, epoxy, and alkenyl radicals.
- an adhesion promoter compound may be an organic titanium compound, preferably a titanium chelate or a metal alkoxide of formula Ti(OR)4 where R is chosen from linear or branched Ci-Cs alkyl groups, alkoxyalkyl groups or acyl groups.
- the organic titanium compound is chosen from titanium alkylates such as butyl titanate, isopropyl titanate, methyl titanate and octyl titanate.
- the organic titanium compound is butyl titanate (TBOT).
- the silicone composition according to the present invention does not contain an adhesion promoter compound.
- the silicone composition according to the present invention preferably does not contain any of the adhesion promoting compounds mentioned individually above.
- the silicone composition according to the present invention preferably does not contain any organic solvent, typically no toluene or xylene.
- the silicone composition crosslinkable by polyaddition reaction according to the invention comprises, based on the total weight of the silicone composition:
- organopolysiloxane A presenting, per molecule, at least two C2-C12 alkenyl groups linked to silicon
- organopolysiloxane B presenting, per molecule, at least two SiH units
- - optionally, from 5% to 40%, preferably from 10% to 30%, of a silica filler.
- the silicone composition crosslinkable by polyaddition reaction according to the invention comprises, based on the total weight of the silicone composition:
- organopolysiloxane A presenting, per molecule, at least two C2-C12 alkenyl groups linked to silicon
- an organopolysiloxane B having, per molecule, at least two SiH units, and an organopolysiloxane B having a branched structure like a silicone resin,
- the silicone composition crosslinkable by polyaddition reaction according to the invention preferably has a viscosity greater than 5000 mPa.s, more preferably between 10000 mPa.s and 100000 mPa.s.
- the silicone composition according to the invention can be prepared from a two-component system characterized in that it is presented in two distinct parts intended to be mixed to form said silicone composition, and in this that one of the parts includes catalyst C and does not include organopolysiloxane B, while the other part includes organopoly siloxane B and does not include catalyst C.
- the silicone composition can be prepared by mixing all of the different components as described above.
- the mixing can be carried out with mixers suitable for such compositions, for example kneaders or planetary mixers under inert gas atmospheres.
- the two parts of the composition can be stored in a two-component glue cartridge, the mixing being ensured at the outlet of the cartridge by a static mixer.
- the silicone composition according to the invention forms a structural silicone adhesive allowing the assembly of several substrates.
- the article suitable for food contact according to the present invention comprises a first substrate and a second substrate, these two substrates joined being by the adhesive as described above.
- the first substrate comprises a support coated with a silicone coating suitable for food contact.
- the support is preferably a fibrous support.
- fibrous supports we can cite the various varieties of paper (such as Kraft paper, the degree of refinement of which can be any, crystal paper, parchment paper), cardboard, vegetable parchment, papers coated with polyethylene or carboxymethylcellulose, cellulose leaves.
- the support is chosen from paper and cardboard.
- a paper can preferably be selected having a Bendtsen porosity of between 0.1 mL/min and 500 mL/min according to the ISO 5636-3 standard and a COBB value for water of between between 5 and 30 according to the ISO 535 method.
- the support can be a polymeric material, for example a sheet of polymeric materials such as those made of polyethylene, polypropylene, polyethyl terephthalate, polyester or even natural polymer.
- the support can be made of metal, for example a metal sheet.
- the support according to the present invention is a flexible support.
- the term “flexible support” means a support which can be curved or folded by human force alone without breaking or being damaged.
- the support according to the present invention is a rigid or semi-rigid support.
- the term "rigid or semi-rigid support” means a support which cannot be curved or folded easily by human force alone without breaking or being damaged.
- the support is in the form of a sheet or film.
- any other form is possible within the framework of the present invention.
- the support of said first substrate is coated with a silicone coating suitable for food contact.
- the silicone coating can be present on one side of the support or on both sides.
- Such coatings are known to those skilled in the art.
- the silicone coating suitable for food contact can be obtained by coating the support then crosslinking a silicone composition.
- Said silicone composition may be a silicone emulsion or a solvent-free silicone composition.
- silicone emulsions reference may in particular be made to European patent application EP 0253747 and international applications WO 99/35181 and WO 2018/178321.
- solvent-free silicone compositions we can for example refer to international application WO 2005/059039.
- a suitable silicone coating consists of a water-repellent and non-stick coating or film obtained by coating the support then crosslinking a silicone emulsion.
- Said silicone emulsion can crosslink via polycondensation chemistry or via polyaddition chemistry.
- said silicone emulsion is an aqueous silicone emulsion crosslinkable into a silicone elastomer by polyaddition reactions.
- polyaddition chemistry is preferred for reasons of suitability for food contact, because certain tin-based polycondensation catalysts cannot be used.
- a silicone coating obtained by polyaddition reactions could present residual chemical functions on the surface, potentially available to serve as an anchoring point for the structural silicone adhesive. which involves the same crosslinking chemistry.
- aqueous silicone emulsion crosslinkable into a silicone elastomer by polyaddition reactions, comprising:
- a bactericidal agent such as for example sorbic acid
- an antifreeze and/or wetting agent such as for example glycols such as propylene or ethylene glycol
- an antifoam a preferably mineral filler chosen from siliceous or non-siliceous materials, siliceous fillers being more particularly preferred, a dye or pigment, an acid
- silicone compositions are not compatible with use for food contact. It is therefore preferable that the silicone composition does not contain any additional additive.
- the manufacture of the support coated with a silicone coating according to the present invention can typically be carried out by in-line coating, that is to say directly on the machine manufacturing the support once the sheet has been formed.
- the silicone coating preferably has a thickness of between 0.05 g/m 2 and 1 g/m 2 .
- the quantity of silicone emulsion coated on the support must be adapted taking into account penetration of the silicone into the support. For example, if the penetration of silicone into the paper is between 0% and 50% and the paper is coated on both sides, then the total quantity of silicone per m 2 of paper is preferably between 0.1 g /m 2 and 4 g/m 2 .
- the second substrate according to the present invention is identical to the first substrate.
- the first substrate and the second substrate can be a single silicone sheet folded on itself.
- the second substrate therefore comprises a support coated with a silicone coating suitable for food contact.
- the support and the silicone coating can be as described previously for the first substrate.
- the structural silicone adhesive is preferably inserted between the two substrates and is in contact with the silicone coatings of the two substrates.
- the second substrate according to the present invention is different from the first substrate.
- the second substrate can be a support as described above without silicone coating.
- the second substrate may be a transparent sheet of polymeric material.
- the structural silicone adhesive is preferably inserted between the two substrates and is in contact with the silicone coating of the first substrate, the second substrate not necessarily having a silicone coating.
- the article suitable for food contact according to the invention can be obtained by a process comprising the steps consisting of:
- first substrate comprising a support coated with a silicone coating suitable for food contact
- the deposition of the crosslinkable silicone composition by polyaddition reaction suitable for food contact on the silicone coating of said first substrate can be implemented according to methods known to those skilled in the art. Deposition can typically be done by casting, brushing, scraping, immersion or extrusion. According to one embodiment, the deposition of the silicone composition is carried out continuously on a part of the silicone coating of the first substrate. Thus, the silicone coating of the first substrate is covered for example by a strip of silicone composition. This embodiment is advantageous if it is desired to obtain continuous and waterproof bonding between the first and the second substrate.
- the quantity of silicone composition deposited on the silicone coating of the first substrate could be between 1 g/m 2 and 50 g/m 2 , preferably between 5 g/m 2 and 20 g/m 2 .
- the method may comprise an optional step of surface treatment of the silicone coating of said first substrate, for example a Corona treatment.
- the assembly of the second substrate with the first substrate can be carried out continuously using contact cylinders and doctor blades.
- the silicone composition can crosslink without external intervention if the reactivity between the parts previously brought into contact is sufficient. However, it is preferable to thermally activate the crosslinking reaction.
- the means of thermal activation of crosslinking are conventionally ovens (for example tunnel ovens), heated laminating rolls, or infrared sources. This thermal activation can be supplemented by actinic activation and/or by electron bombardment.
- the crosslinking temperature can be greater than 120°C, without exceeding the degradation temperature of the support, preferably between 160°C and 200°C.
- the duration of this step of thermal activation of the crosslinking can be between 0.1 s and 30 s, preferably between 0.1 s and 5 s.
- the crosslinking reaction can be activated by irradiation, for example by UV.
- irradiation for example by UV.
- those skilled in the art will be able to choose a photo-activatable polyaddition catalyst, and possibly appropriate photosensitization additives.
- the steps of manufacturing the article suitable for food contact as described above can be carried out continuously, using devices known to those skilled in the art, in particular using machines for manufacturing packaging.
- the final thickness of the structural silicone adhesive can be between 1 pm and 50 pm, preferably between 5 pm and 20 pm.
- the article suitable for food contact according to the present invention can advantageously be food packaging. It can for example be chosen from:
- bags, pouches and pouches in particular for waterproof packaging, with the possible presence of a ventilation valve, bags for sandwiches, bags with or without transparent window, bloomer bags, etc.
- corrugated cardboard box (pizza box type).
- the article according to the present invention has properties which make it particularly interesting for food packaging professionals, and for the end consumer:
- Silicone when correctly formulated and used, is renowned for its non-toxicity and its inertness towards food products. In addition, thanks to the use of a polyaddition silicone adhesive, the product does not contain tin-based catalysts.
- the item is able to withstand significant thermal amplitudes, typically from -30°C to +250°C or from -70°C to +250°C.
- the item can be used for both freezing and cooking. It is particularly suitable for cooking in a microwave oven.
- the article has water barrier properties. It is also non-stick and water-repellent: food does not stick to its packaging even after storage.
- the manufacture of the article suitable for food contact according to the invention is possible at high speed, preferably with standard industrial tools in the field of packaging.
- the speed of crosslinking of the adhesive is compatible with the high speeds of the industry.
- the viscosity of the adhesive is also compatible with industrial removal tools.
- the crosslinking of the adhesive takes place without releasing any odor.
- the present invention also relates to the use of a structural silicone adhesive, suitable for food contact obtained by crosslinking a silicone composition crosslinkable by polyaddition reaction for the manufacture of an article suitable for food contact.
- An A5 format silicone baking paper was manually coated with a silicone composition.
- a second baking paper identical to the first, was applied manually to the coating and the assembly was crosslinked as detailed below.
- the silicone compositions tested are as follows:
- PSA 1 Silicone PSA consisting of polydimethylsiloxane gum and MQ(OH) hydroxylated resin in toluene. Dry matter content: 60%. Viscosity: 80000 mPa.s
- PSA 2 Silicone PSA consisting of polydimethylsiloxane gum and MQ(OH) hydroxylated resin in toluene. Dry matter content: 60%. Viscosity: 70000 mPa.s
- Adhesive 1 RTV2 type silicone composition, in 2 parts, crosslinking by polyaddition.
- organopolysiloxane oils B consisting of a polydimethylsiloxane oil with Si(CH 3 ) 2 H ends, and a polymethyl hydrogen siloxane oil with Si(CH 3 ) 3 ends, -23.48 parts of a silica treated combustion, 1
- Parts A and B are mixed in order to obtain a mass ratio of part A relative to part B equal to 10.
- Viscosity of adhesive 1 40000 mPa.s.
- Adhesive 2 (Modification 3): RTV2 type silicone composition, in 2 parts, crosslinking by polyaddition.
- organopolysiloxanes B consisting of an MM'Q type resin where the hydrogen atoms linked to silicon atoms are carried by the M groups, of a polymethylhydrogenosiloxane oil with Si(CH 3 ) ends 3 , and a poly(dimethylsiloxane-co-methylhydrogenosiloxane) oil with Si(CH 3 )2H ends,
- Parts A and B are mixed to obtain a mass ratio of part A to part B equal to 10.
- Viscosity of adhesive 2 40000 mPa.s.
- Adhesive 3 (Modification 7): RTV2 type silicone composition, in 2 parts, crosslinking by polyaddition.
- organopolysiloxane oils B consisting of polymethylhydrogensiloxane oil with Si(CH 3 ) 3 ends and a poly(dimethylsiloxane-co-methylhydrogensiloxane) oil with Si(CH 3 ) 2 H ends.
- Parts A and B are mixed to obtain a mass ratio of part A to part B equal to 10.
- Viscosity of adhesive 3 40000 mPa.s.
- Adhesive 4 (Comparison): RTV2 type silicone composition, in 2 parts, crosslinking by polyaddition.
- TBOT butyl titanate
- Parts A and B are mixed to obtain a mass ratio of part A to part B equal to 10.
- This composition is unsuitable for food contact due to the presence of adhesion promoters such as 3-glycidoxypropyl-trimethoxy silane (GLYMO) or butyl titanate (TBOT).
- adhesion promoters such as 3-glycidoxypropyl-trimethoxy silane (GLYMO) or butyl titanate (TBOT).
- the quality of adhesion was evaluated on a dynamometer using a T-peel method, inspired by the ASTM D1876 standard. Particular attention was paid to the fracture pattern of the specimens, which must be cohesive (tearing of the paper during the test) to guarantee optimal performance of the assembly.
- the results obtained with PSA type compositions are inconclusive and clearly behind structural adhesives.
- the adhesives of the present invention (1, 2 and 3) do not require the presence of an adhesion promoter to obtain satisfactory adhesion results.
- comparative example 5 is an adhesive which crosslinks by polycondensation and thus has the disadvantage of releasing acetic acid.
- adhesives 2 and 3 of the present invention lead to satisfactory results despite a low thickness of coated adhesive.
- these embodiments are particularly advantageous on an industrial scale. Coating test with cylinders
- a coating tool with two cylinders and a heated doctor blade was used. This tool is shown in Figure 1: a first substrate (1) and a second substrate (2) have been fixed on cylinders. An adhesive composition was applied by a dispensing means (3). A heated metal scraper (4) was brought into contact with the second support, before the assembly passed between 2 heated metal lamination cylinders (5). The air gap (6) was fixed between the 2 cylinders at 0.1 mm. Scrolling in the tool is manual and estimated at approximately 10m/min. The set temperature of the blade and the 2 metal cylinders is adjusted electronically.
- Substrate Commercial baking paper coated with silicone
- composition of the silicone adhesive as described above for adhesive 1 Composition of the silicone adhesive as described above for adhesive 1.
- crosslinking is visual and carried out by testing the clogging of the scissor blade: Just after crosslinking, a cutting test is carried out with a paper cutter or scissor to estimate the clogging of the blade. The blade of the cutting tool must not become clogged and remain free of silicone.
- Adhesion is evaluated manually: Just after crosslinking, the two parts of the assembly are held firmly during a shear test. The assembly must be able to withstand the constraints imposed by the production tool.
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Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2204179 | 2022-05-03 | ||
| PCT/FR2023/000072 WO2023214130A1 (fr) | 2022-05-03 | 2023-05-02 | Article apte au contact alimentaire et son procédé de fabrication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4519083A1 true EP4519083A1 (fr) | 2025-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23727397.4A Pending EP4519083A1 (fr) | 2022-05-03 | 2023-05-02 | Article apte au contact alimentaire et son procédé de fabrication |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20250296751A1 (fr) |
| EP (1) | EP4519083A1 (fr) |
| JP (1) | JP2025515648A (fr) |
| KR (1) | KR20250008763A (fr) |
| CN (1) | CN119300975A (fr) |
| CA (1) | CA3251509A1 (fr) |
| WO (1) | WO2023214130A1 (fr) |
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| US9986743B2 (en) * | 2016-03-18 | 2018-06-05 | Wacker Chemie Ag | Baking paper coated with a silicone-containing emulsion |
| WO2018178321A1 (fr) | 2017-03-30 | 2018-10-04 | Elkem Silicones France Sas | Procede de realisation d'un revetement hydrofuge et anti-adherent sur un support |
| JP7132188B2 (ja) * | 2019-07-17 | 2022-09-06 | 信越化学工業株式会社 | トリアリルシアヌレート含有付加硬化型シリコーン組成物及びその製造方法 |
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2023
- 2023-05-02 US US18/861,903 patent/US20250296751A1/en active Pending
- 2023-05-02 CA CA3251509A patent/CA3251509A1/fr active Pending
- 2023-05-02 JP JP2024565026A patent/JP2025515648A/ja active Pending
- 2023-05-02 CN CN202380043449.3A patent/CN119300975A/zh active Pending
- 2023-05-02 KR KR1020247039917A patent/KR20250008763A/ko active Pending
- 2023-05-02 EP EP23727397.4A patent/EP4519083A1/fr active Pending
- 2023-05-02 WO PCT/FR2023/000072 patent/WO2023214130A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CA3251509A1 (fr) | 2023-11-09 |
| KR20250008763A (ko) | 2025-01-15 |
| US20250296751A1 (en) | 2025-09-25 |
| CN119300975A (zh) | 2025-01-10 |
| JP2025515648A (ja) | 2025-05-20 |
| WO2023214130A1 (fr) | 2023-11-09 |
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