Five-layered, biaxially-oriented, sealable tubular film for the packaging and wrapping of paste-like foodstuffs meat and meat with bones and use thereof
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-001/08
B32B-001/00
A21D-006/00
A24F-027/00
출원번호
US-0466773
(2001-02-01)
국제출원번호
PCT/EP01/001068
(2001-02-01)
§371/§102 date
20030801
(20030801)
국제공개번호
WO02/060267
(2002-08-08)
발명자
/ 주소
Grund,Hartmut
Lang,Horst
Schauer,Helmut
출원인 / 주소
Naturin GmbH &
Co.
대리인 / 주소
Oblon, Spivak, McClelland, Maier &
인용정보
피인용 횟수 :
2인용 특허 :
0
초록▼
The invention relates to a five-layered, biaxially oriented, shrinkable, sealable tubular film for the packaging and wrapping of paste-like foodstuffs, meat, or meat with bones and to the use thereof. The tubular film of the invention has an inner layer comprised of at least one copolyamide and at l
The invention relates to a five-layered, biaxially oriented, shrinkable, sealable tubular film for the packaging and wrapping of paste-like foodstuffs, meat, or meat with bones and to the use thereof. The tubular film of the invention has an inner layer comprised of at least one copolyamide and at least one modified polyolefin, a layer of a modified polyolefin, a middle layer comprised of at least one homopolyamide and/or at lest one copolyamide and/or at least one copolymer of ethylene and vinyl alcohol and/or a modified polyolefin, a layer of at least one ethylene-vinyl alcohol copolymer, and an outer layer comprised of at least one polyolefin and/or at least one modified polyolefin. Such tubular films involve a significant improvement in the seal seam strength, in particular at low sealing temperatures, a high impermeability to oxygen and a comparable to markedly higher resistance to puncturing compared to prior art films.
대표청구항▼
The invention claimed is: 1. A five-layered, biaxially oriented, shrinkable, sealable tubular film for the packaging and wrapping of paste-like foodstuffs, meat, or meat with bones, wherein the tubular film comprises: an inner layer comprised of at least one copolyamide and a polymer material selec
The invention claimed is: 1. A five-layered, biaxially oriented, shrinkable, sealable tubular film for the packaging and wrapping of paste-like foodstuffs, meat, or meat with bones, wherein the tubular film comprises: an inner layer comprised of at least one copolyamide and a polymer material selected from the group consisting of at least one amorphous polyamide, at least one homopolyamide, at least one modified polyolefin and mixtures thereof, a layer comprising a modified polyolefin, a middle layer comprised of a polymer material selected from the group consisting of at least one homopolyamide, at least one copolyamide, at least one copolymer of ethylene and vinyl alcohol, a modified polyolefin and mixtures thereof, a layer comprised of at least one ethylene-vinyl alcohol copolymer, and an outer layer comprised of at least one polyolefin, at least one modified polyolefin or a combination thereof. 2. The tubular film according to claim 1, wherein the inner layer comprises copolyamides produced from monomers selected from the group consisting of caprolactam, laurinlactam, ω-aminoundecanoic acid, adipic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, dodecanedicarboxylic acid, terephthalic acid, isophthalic acid, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine and xylylenediamine. 3. The tubular film according to claim 2, wherein the inner layer comprises at least one copolyamide which is present in an amount ranging from 50 to 95 wt %. 4. The tubular film according to claim 1, wherein the inner layer comprises at least one amorphous polyamide having a glass transition temperature ranging from 50 to 200째 C. in a dry state. 5. The tubular film according to claim 4, wherein the glass transition temperature of the amorphous polyamide ranges from 90 to 160째 C. 6. The tubular film according to claim 1, wherein the inner layer comprises homopolyamides produced from monomers selected from the group consisting of caprolactam, laurinlactam, ω-aminoundecanoic acid, adipic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, dodecanedicarboxylic acid, terephthalic acid, isophthalic acid, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine and xylylenediamine. 7. The tubular film according to claim 1, wherein the inner layers comprise at least one modified polyolefin, which is a copolymer of ethylene or propylene and optionally other linear α-olefins having from 3 to 8 C atoms and α,β-unsaturated carboxylic acids and/or metal salts and/or alkyl esters thereof, or graft copolymers of the above mentioned monomers on polyolefins, or partially saponified ethylene-vinyl acetate copolymers which are optionally graft-polymerized with an α,β-unsaturated carboxylic acid and have a low saponification level, or mixtures thereof. 8. The tubular film according to claim 1, wherein each of the amorphous polyamide, homopolyamide and modified polyolefin in the inner layer, is present in amounts ranging from 0 to 30 wt % relative to the total weight of the inner layer. 9. The tubular film according to claim 1, wherein the layer adjacent to the inner layer comprises a modified polyolefin or a mixture of modified polyolefins. 10. The tubular film according to claim 9, wherein the modified polyolefins are modified homo-or co-polymers of ethylene, propylene or combinations thereof and optionally other linear α-olefins having from 3 to 8 C atoms, which have monomers selected from the group consisting of α,β-unsaturated carboxylic acids or anhydrides, esters, amides or imides thereof grafted thereon. 11. The tubular film according to claim 9, wherein the modified polyolefins are copolymers of ethylene, propylene or combinations thereof and optionally other linear α-olefins having from 3 to 8 C atoms and α,β-unsaturated carboxylic acids, metal salts thereof, alkyl esters thereof or mixtures thereof, or graft copolymers of the above-mentioned monomers on polyolefins, or partially saponified ethylene-vinyl acetate copolymers which are optionally graft-polymerized with an α,β-unsaturated carboxylic acid and have a low saponification level, or mixtures thereof. 12. The tubular film according to claim 1, wherein the middle layer comprises at least one homopolyamide and/or at least one copolyamide produced from monomers selected from the group consisting of caprolactam, laurinlactam, ω-aminoundecanoic acid, adipic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, dodecanedicarboxylic acid, terephthalic acid, isophthalic acid, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine and xylylenediamine. 13. The tubular film according to claim 12, wherein the middle layer further comprises at least one modified polyolefin produced by copolymerization of ethylene or propylene and optionally other linear α-olefins having from 3 to 8 C atoms and α,β-unsaturated carboxylic acids, metal salts thereof, alkyl esters thereof or mixtures thereof, or graft copolymers of the above-mentioned monomers on polyolefins, or partially saponified ethylene-vinyl acetate copolymers which are optionally graft-polymerized with an α,β-unsaturated carboxylic acid and have a low saponification level, or mixtures thereof. 14. The tubular film according to claim 12, wherein the middle layer further comprises a copolymer of ethylene vinyl alcohol, and the amount of ethylene in the ethylene vinyl alcohol copolymer ranges from 27 to 48 mole %. 15. The tubular film according to claim 12, wherein the amount of the modified polyolefin and/or the ethylene vinyl alcohol copolymer ranges from 0 to 50 wt %, relative to the total weight of the middle layer. 16. The tubular film according to claim 1, wherein a layer comprised of at least one ethylene-vinyl alcohol copolymer is disposed between the middle layer and the outer layer. 17. The tubular film according to claim 16, wherein the amount of ethylene in said ethylene vinyl alcohol copolymer ranges from 27 to 48 mole %. 18. The tubular film according to claim 16, wherein the layer between the middle layer and outer layer further comprises homopolyamides, copolyamides, modified polyolefins or mixtures thereof. 19. The tubular film according to claim 18, wherein the homo-and copolyamides are produced from monomers selected from the group consisting of caprolactam, laurinlactam, ω-aminoundecanoic acid, adipic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, dodecanedicarboxylic acid, terephthalic acid, isophthalic acid, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine and xylylenediamine. 20. The tubular film according to claim 18, wherein the modified polyolefins are produced by co-polymerization of ethylene or propylene and optionally other linear α-olefins having from 3 to 8 C atoms and α,β-unsaturated carboxylic acids, metal salts thereof, alkyl esters thereof or mixtures thereof, or graft copolymers of the above-mentioned monomers on polyolefins, or partially saponified ethylene-vinyl acetate copolymers which are optionally graft-polymerized with an α,β-unsaturated carboxylic acid and have a low saponification level, or mixtures thereof. 21. The tubular film according to claim 18, wherein the amount of homopolyamide, copolyamide, modified polyolefin or mixtures thereof in the layer disposed between the middle and outer layer ranges from 0 to 40 wt %, relative to the total weight of the layer. 22. The tubular film according to claim 1, wherein the outer layer comprises at least one polyolefin, at least one modified polyolefin or mixtures thereof. 23. The tubular film according to claim 22, wherein the outer layer comprises at least one polyolefin selected from the group consisting of linear low-density polyethylene, high density polyethylene, polypropylene homopolymers, poly-propylene block copolymers and polypropylene random co-polymers. 24. The tubular film according to claim 22, wherein the outer layer comprises at least one modified polyolefin produced by co-polymerization of ethylene or propylene and optionally other linear α-olefins having from 3 to 8 C atoms and α,β-unsaturated carboxylic acids, metal salts thereof, alkyl esters thereof or mixtures thereof, or graft copolymers of the above-mentioned monomers on polyolefins, or partially saponified ethylene-vinyl acetate copolymers which are optionally graft-polymerized with an α,β-unsaturated carboxylic acid and have a low saponification level, or mixtures thereof. 25. The tubular film according to claim 22, wherein the modified polyolefins of the outer layer are modified homo-or co-polymers of ethylene, propylene or combinations thereof and optionally other linear α-olefins having from 3 to 8 C atoms, which have monomers selected from the group consisting of α,β-unsaturated carboxylic acids or anhydrides, esters, amides or imides thereof grafted thereon. 26. The tubular film according to claim 1, wherein the tubular film comprises a coextruded and biaxially stretched tubular film which has been subjected to heat-setting. 27. The tubular film according to claim 1, wherein the wall thickness thereof ranges from 30 to 100 μm. 28. A package for paste-like foodstuffs, meat, or meat with bones comprising the tubular film according to claim 1. 29. A bag comprising the tubular film according to claim 1 prepared by welding or sealing the inner layer on itself. 30. Paste-like foodstuffs, meat, or meat with bones packaged in a bag according to claim 29. 31. The tubular film according to claim 7, wherein the α ,β-unsaturated carboxylic acids are acrylic acid, methacrylic acid or combinations thereof. 32. The tubular film according to claim 8, wherein each of the amorphous polyamide, homopolyamide and modified polyolefin in the inner layer, is present in amounts ranging from 5 to 25 wt %, relative to the total weight of the inner layer. 33. The tubular film according to claim 10, wherein the α,β-unsaturated carboxylic acids are selected from the group consisting of maleic acid, fumaric acid, and itaconic acid. 34. The tubular film according to claim 11, wherein the α,β-unsaturated carboxylic acids are acrylic acid, methacrylic acid or mixtures thereof. 35. The tubular film according to claim 13, wherein the α,β-unsaturated carboxylic acids are acrylic acid, methacrylic acid or mixtures thereof. 36. The tubular film according to claim 14, wherein the amount of ethylene vinyl alcohol copolymer ranges from 27 to 38 mole %. 37. The tubular film according to claim 17, wherein the amount of ethylene/vinyl alcohol copolymer ranges from 34 to 48 mole %. 38. The tubular film according to claim 20, wherein the α,β-unsaturated carboxylic acids are acrylic acid, methacrylic acid or mixtures thereof. 39. The tubular film according to claim 24, wherein the α,β-unsaturated carboxylic acids are acrylic acid, methacrylic acid or mixtures thereof. 40. The tubular film according to claim 25, wherein the α,β-unsaturated carboxylic acids are selected from the group consisting of maleic acid, fumaric acid, and itaconic acid. 41. The tubular film according to claim 1, wherein the wall thickness thereof ranges from 40 to 80 μm.
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이 특허를 인용한 특허 (2)
Delius, Ulrich; Feron, Bernhard, Biaxially drawn tubular film comprising three adjacent polyamide-based layers.
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