A multilayer structure of, in succession, a metal layer or a metallized-substrate layer, a layer of a polypropylene-based binder extrusion-coated at a rate of more than 100 m/min. and optionally a polypropylene layer, the metal or metallized layer and the binder layer being made non-delaminable by h
A multilayer structure of, in succession, a metal layer or a metallized-substrate layer, a layer of a polypropylene-based binder extrusion-coated at a rate of more than 100 m/min. and optionally a polypropylene layer, the metal or metallized layer and the binder layer being made non-delaminable by heat treating the structure. The extrudable binder contains by weight: (A) 5 to 30% of a copolymer of ethylene and one or more comonomers chosen from the group of carboxylic acid esters, vinyl esters and dienes in particular the ethylene/alkyl (meth)acrylate/maleic anhydride terpolymer; (B) 40 to 93% of a stretchable polypropylene; and (C) 2 to 30% of a polypropylene functionalized by an unsaturated carboxylic acid anhydride, especially maleic anhydride; the MFI of the composition being between 10 and 50 g/10 min. (at 230° C./2.16 kg). the multi-layer structure is useful for the production of packages.
대표청구항▼
1. A multilayer structure comprising a metal layer or a metallized-substrate layer (5) and a binder layer (6) comprising polypropylene, extrusion-coated at a rate of more than 100 m/min. onto the metal or metallized-substrate layer, said layers (6, 5) being made non-delaminable by heat treating the
1. A multilayer structure comprising a metal layer or a metallized-substrate layer (5) and a binder layer (6) comprising polypropylene, extrusion-coated at a rate of more than 100 m/min. onto the metal or metallized-substrate layer, said layers (6, 5) being made non-delaminable by heat treating the said structure to a temperature above the melting point of the binder layer (6), and a polypropylene layer (2) having a melting point above the melting point of the binder, the binder layer (6) being sandwiched between the metal layer or metallized-substrate layer (5) and the polypropylene layer (2), wherein said structure is peelable between binder layer (6) and polypropylene layer (2), and said binder layer (6) comprises by weight:5 to 30% of a copolymer (A) based on ethylene and one or more comonomers chosen from the group consisting of carboxylic acid esters, vinyl esters and dienes; 40 to 93% of a stretchable polypropylene (B), stretchability being defined as the ability of a rod extruded at a temperature of between 190° C. and 240° C. and pulled at a pull rate of between 50 and 250 m/min. without breaking; 2 to 30% of an additional polypropylene (C) functionalized by an unsaturated carboxylic acid anhydride; the MFI of the composition being between 10 and 50 g/10 min. at 230° C./2.16 kg. 2. A structure according to claim 1, wherein the heat treatment is carried out by infrared radiation, by passing it through a hot air or induction-heating tunnel.3. A structure according to claim 1, wherein said structure comprises polypropylene layers (7) and (2) having a melting point above the melting point of the binder, the binder layer (6) being sandwiched between the metal layer or metallized-substrate layer (5) and the polypropylene layer (7), the heat treating being at a temperature below the melting temperature of the polypropylene layer (7).4. A process of producing the multi-layer structure of claim 3, comprising the step of extrusion-coating said binder layer at a rate of more than 100 m/min. onto said metal or metallized substrate layer, and heat treating the resultant extrusion coated structure at a temperature above the melting point of the binder layer, said heat treating being at a temperature below the melting temperature of the polypropylene layer (2).5. A structure according to claim 3, wherein said structure is peelable with a peel force for peeling a binder layer (6) off the polypropylene layer (7,2) of between 8 and 15 N/15 mm.6. A structure according to claim 1, wherein the copolymer (A) of the binder comprises an ethylene/alkyl (meth)acrylate copolymer containing from 5 to 40% by weight of alkyl (meth)acrylate, the MFI being between 0.5 and 200 g/10 min. at 190° C./2.16 kg.7. A structure according to claim 6, wherein the ethylene/alkyl (meth)acrylate copolymer contains 10-40% by weight of the alkyl acrylate.8. A structure according to claim 1, wherein the copolymer (A) of the binder comprises an ethylene/alkyl (meth)acrylate/maleic anhydride copolymer containing from above 0 to 10% by weight of maleic anhydride and from 2 to 40% by weight of alkyl (meth)acrylate, the MFI being between 0.5 and 200 g/10 min. at 190° C./2.16 kg.9. A structure according to claim 8, wherein the ethylene/alkyl (meth)acrylate/maleic anhydride copolymer contains 5 to 40% by weight of the alkyl meth(acrylate).10. A structure according to claim 1, wherein the copolymer (A) of the binder is a blend of copolymers (A), of an ethylene/alkyl (meth)acrylate copolymer containing 5 to 40% by weight of alkyl (meth)acrylate, and of an ethylene/alkyl (meth)acrylate/maleic anhydride copolymer containing from above 0 to 10% by weight of maleic anhydride and from 2 to 40% by weight of alkyl (meth)acrylate.11. A structure according to claim 1, in which the proportion of polypropylene (C) in the binder is between 1.5 and 6% by weight, said polypropylene (C) containing from 1.5 to 6% by weight of maleic anhydride.12. A structure according to claim 1, in which the proportion of polypropylene (C) in the binder is between 10 and 25% by weight, said polypropylene (C) containing from 0.8 to 1.5% by weight of maleic anhydride.13. A structure according to claim 1, in which the proportion of polypropylene (C) in the binder is between 3 and 5% by weight, said polypropylene (C) containing from 1.5 to 3% by weight of maleic anhydride.14. A package made with a structure according to claim 1.15. A package according to claim 14, characterized in that it is sterilizable and resistant to food acids and high-performance solvents and greases.16. A process of producing the multi-layer structure of claim 1, comprising the step of extrusion-coating said binder layer at a rate of more than 100 m/min. onto said metal or metallized substrate layer, and heat treating the resultant extrusion coated structure at a temperature above the melting point of the binder layer.17. A structure according to claim 1, wherein said structure is peelable with a peel force for peeling the binder layer (6) off the polypropylene layer (2) of between 8 and 15 N/15 mm.18. A multilayer structure comprising a metal layer or a metallized-substrate layer (5) and a binder layer (6) comprising polypropylene, extrusion-coated at a rate of more than 100 m/min. onto the metal or metallized-substrate layer, said layers (6, 5) being made non-delaminable by heat treating the said structure to a temperature above the melting point of the binder layer (6), and a polypropylene layer (2) having a melting point above the binder layer (6) being sandwiched between the metal layer or metallized-substrate layer (5) and the polypropylene layer (2), wherein said structure is peelable between binder layer (6) and polypropylene layer (2), and said binder layer (6) comprises a copolymer (A) based on ethylene and carboxylic acid esters, vinyl esters and dienes; polypropylene (B), and additional polypropylene (C) functionalized by an unsaturated carboxylic acid anhydride.19. A structure according to claim 18, wherein copolymer (A) is not grafted.20. A multilayer structure comprising a metal layer or a metallized-substrate layer (5) and a binder layer (6) comprising polypropylene, extrusion-coated at a rate of more than 100 m/min. onto the metal or metallized-substrate layer, said structure having been heat treated to a temperature above the melting point of the binder layer (6), and a polypropylene layer (2) the binder layer (6) being sandwiched between the metal layer or metallized-substrate layer (5) and the polypropylene layer (2), wherein said structure is peelable between binder layer (6) and polypropylene layer (2), and said binder layer (6) comprises a copolymer (A) based on ethylene and carboxylic acid esters, vinyl esters and dienes; polypropylene (B), and additional polypropylene (C) functionalized by an unsaturated carboxylic acid anhydride.
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이 특허에 인용된 특허 (7)
Boehrer Marianne (Selestat FRX), Container for a product to be heated in a microwave oven.
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