IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0184143
(2005-07-19)
|
등록번호 |
US-7422796
(2008-09-09)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- E. I. du Pont de Nemours and Company
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
15 |
초록
▼
Disclosed are films comprising highly neutralized blends of ethylene acid copolymers, organic acid salts and ethylene containing polymers (e.g. ethylene/alkyl (meth)acrylate copolymers) and/or silicon-containing polymers to provide high oxygen permeability values (OPV). Such polymeric film and polym
Disclosed are films comprising highly neutralized blends of ethylene acid copolymers, organic acid salts and ethylene containing polymers (e.g. ethylene/alkyl (meth)acrylate copolymers) and/or silicon-containing polymers to provide high oxygen permeability values (OPV). Such polymeric film and polymeric film structures have improved oxygen permeability and desirable water vapor transmission, formability, and structural strength to be useful in wrapping food products requiring breathable films such as case ready meat, fish, sausage, fresh produce, and the like.
대표청구항
▼
What is claimed is: 1. A monolithic film obtained from a blend consisting essentially of: (a) one or more aliphatic organic acids or salts thereof having fewer than 36 carbon atoms; (b) at least one E/X/Y copolymer (ethylene acid copolymer) wherein E is derived from ethylene, X is derived from at l
What is claimed is: 1. A monolithic film obtained from a blend consisting essentially of: (a) one or more aliphatic organic acids or salts thereof having fewer than 36 carbon atoms; (b) at least one E/X/Y copolymer (ethylene acid copolymer) wherein E is derived from ethylene, X is derived from at least one C3 to C8 α,β-ethylenically unsaturated carboxylic acid, and Y is derived from a comonomer selected from alkyl acrylates and alkyl methacrylates, wherein the alkyl groups have from 1 to 8 carbon atoms, or ionomers of said E/X/Y copolymers, wherein X is from about 3 to about 30 weight % of said E/X/Y copolymer, and Y is from 0 to about 35 weight % of said E/X/Y copolymer, and wherein greater than 70% of all the total acid moieties from (a) plus (b) are neutralized to the corresponding metal salts; and (c) at least one additional polymer selected from the group consisting of: silicone-containing polymers and ethylene copolymers having comonomer units selected from the group consisting of alkyl acrylates, alkyl methacrylates, carbon monoxide, vinyl acetate, maleic anhydride, maleic anhydride derivatives and mixtures thereof. 2. The film of claim 1 wherein the acid moieties of (a) and of (b) are greater than about 80% nominally neutralized. 3. The film of claim 2 wherein the metal salts consist essentially of calcium and/or magnesium cations. 4. The film of claim 3 wherein the metal salts consist essentially of calcium cations. 5. The film of claim 3 wherein the metal salts consist essentially of magnesium cations. 6. The film of claim 5 wherein the acid moieties of (a) and of (b) are greater than about 80% nominally neutralized. 7. The film of claim 6 wherein the acid moieties of (a) and of (b) are greater than about 90% nominally neutralized. 8. The film of claim 7 wherein the acid moieties of (a) and of (b) are from about 91 to about 100% nominally neutralized. 9. The film of claim 8 wherein the organic acid of part (a) is present in an amount of from about 5 to about 150 parts per hundred parts by weight of the unsaturated carboxylic acid copolymer or ionomer. 10. The film of claim 9 wherein the organic acid of part (a) is present in an amount of from about 25 to about 80 parts per hundred parts by weight of the unsaturated carboxylic acid copolymer or ionomer. 11. The film of claim 10 wherein X is present in the unsaturated carboxylic acid copolymer in an amount of from about 4 to about 25 weight percent of the polymer. 12. The film of claim 11 wherein X is present in an amount of from about 5 to about 20 weight percent of the polymer. 13. The film of claim 10 wherein Y is 0 weight percent of the polymer. 14. The film of claim 13 wherein Y is present in from 0.1 to 35 weight percent of the polymer. 15. The film of claim 14 wherein Y is present in from 5 to 30 weight percent of the polymer. 16. The film of claim 15 wherein Y is selected from monomers in the group consisting of alkyl (meth)acrylates having alkyl groups having from 1 to 6 carbon atoms. 17. The film of claim 16 wherein Y is selected from monomers in the group consisting of alkyl (meth)acrylates having alkyl groups having from 1 to 4 carbon atoms. 18. The film of claim 1 wherein the additional polymer is an ethylene copolymer having comonomer units selected from the group consisting of vinyl acetate, alkyl acrylates and alkyl methacrylates. 19. The film of claim 16 wherein the component (c) silicon-containing polymer is selected from the group consisting of ethylene vinyl silane copolymers; polysiloxane; and silicone rubber. 20. A multilayer film comprising at least one film layer obtained from a blend consisting essentially of: (a) one or more aliphatic organic acids or salts thereof having fewer than 36 carbon atoms; (b) at least one E/X/Y copolymer wherein E is derived from ethylene, X is derived from at least one C3 to C8 α,β-ethylenically unsaturated carboxylic acid (ethylene acid copolymer), and Y is derived from a comonomer selected from alkyl acrylates and alkyl methacrylates, wherein the alkyl groups have from 1 to 8 carbon atoms, or ionomers of said E/X/Y copolymers, wherein X is from about 3 to about 30 weight % of said E/X/Y copolymer, and Y is from 0 to about 35 weight % of said E/X/Y copolymer, and wherein greater than 70% of all the total acid moieties from (a) plus (b) are neutralized to the corresponding metal salts; and (c) at least one additional polymer selected from the group consisting of: silicone-containing polymers and ethylene copolymers having comonomer units selected from the group consisting of alkyl acrylates, alkyl methacrylates, carbon monoxide, vinyl acetate, maleic anhydride, maleic anhydride derivatives and mixtures thereof. 21. The multilayer film of claim 20 comprising at least a second film layer comprising a blend of (a), (b), and (c) that is a different composition from the at least first film layer. 22. The multilayer film of claim 20 comprising at least a second layer wherein the second layer comprises a blend of: (a) one or more aliphatic, organic acids having fewer than 36 carbon atoms, or salts thereof; and (b) one or more E/X/Y copolymers where E is derived from ethylene, X is derived from at least one C3 to C8 α,β-ethylenically unsaturated carboxylic acid, and Y is derived from a softening comonomer selected from alkyl acrylate and alkyl methacrylate, wherein the alkyl groups have from 1 to 8 carbon atoms, or ionomers of said E/X/Y copolymers, wherein X is from about 3 to about 35 weight % of said E/X/Y copolymer, and Y is from 0 to about 35 weight % of said E/X/Y copolymer, and wherein greater than about 70% of all the acid moieties of (a) and of (b) are neutralized. 23. The multilayer film of claim 20 comprising at least one other polymeric layer (ii) consisting essentially of one or more ethylene-containing polymers. 24. The multilayer film of claim 23 wherein the one or more ethylene-containing polymers of (ii) is selected from the group consisting of polyethylene homopolymers and copolymers, including LDPE, LLDPE, ULDPE, VLDPE, mPE, ethylene propylene copolymers, ethylene/propylene/diene monomer (EPDM) copolymers; and ethylene copolymers derived from copolymerization of ethylene and at least one polar comonomer selected from the group consisting of (meth)acrylic acid, alkyl (meth)acrylate, vinyl acetate, maleic anhydride, maleic acid, maleic acid monoester, and CO, wherein copolymers comprising acid groups (e.g. (meth)acrylic acid) optionally are at least partially neutralized. 25. The multilayer film of claim 24 wherein (ii) comprises a graft copolymer. 26. The multilayer film of claim 24 wherein (ii) consists essentially of a copolymer of ethylene and vinyl acetate. 27. The multilayer film of claim 26 comprising at least three polymeric layers wherein the outer layers consist essentially of an ethylene/vinyl acetate copolymer. 28. The multilayer film of claim 24 comprising at least two layers, wherein at least one of the additional polymeric layers consist essentially of a copolymer of ethylene and an alkyl (meth)acrylate. 29. The multilayer film of claim 24 comprising at least three polymeric layers wherein the outer layers each consist essentially of a copolymer of ethylene and an alkyl (meth)acrylate. 30. The multilayer film of claim 23 wherein (ii) consists essentially of a metallocene polyethylene having a density of less than 0.91 g/cc; or a blend of a metallocene polyethylene having a density of less than 0.91 g/cc and a low density polyethylene. 31. The multilayer film of claim 30 comprising at least three polymeric layers wherein the outer layers consist essentially of a metallocene polyethylene having a density of less than 0.91 g/cc; or a blend of a metallocene polyethylene having a density of less than 0.91 g/cc and a low density polyethylene. 32. The multilayer film of claim 23 wherein (ii) consists essentially of an E/X/Y copolymer wherein E is derived from ethylene, X is derived from at least one C3 to C8 α,β-ethylenically unsaturated carboxylic acid, and Y is derived from a softening comonomer selected from alkyl acrylate and alkyl methacrylate, or ionomers of the E/X/Y copolymers, wherein X is from about 3 to 35 weight % of the E/X/Y copolymer, and Y is from 0 to about 35 weight % of the E/X/Y copolymer and wherein from about 0% to about 90% of the acid in X is neutralized. 33. The multilayer film of claim 32 comprising at least three polymeric layers wherein the outer layers consists essentially of the ionomer of (ii). 34. The multilayer film of claim 23 comprising at least three polymeric layers wherein at least one polymeric layer (ii) consists essentially of an E/X/Y copolymer where E is derived from ethylene, X is derived from at least one C3 to C8 α,β-ethylenically unsaturated carboxylic acid, and Y is derived from a softening comonomer selected from alkyl acrylate and alkyl methacrylate, or ionomers of the E/X/Y copolymers, wherein X is from about 3 to 35 weight % of the E/X/Y copolymer, and Y is from 0 to about 35 weight % of the E/X/Y copolymer and wherein from about 0% to about 90% of the acid is neutralized; and at least one additional polymeric layer (iii) consists essentially of a metallocene polyethylene having a density of less than 0.91 g/cc; or a blend of a metallocene polyethylene having a density of less than 0.91 g/cc and a low density polyethylene. 35. The multilayer film of claim 23 comprising at least three polymeric layers wherein one polymeric layer (ii) consists essentially of an E/X/Y copolymer where E is derived from ethylene, X is derived from at least one C3 to C8 α,β-ethylenically unsaturated carboxylic acid, and Y is derived from a softening comonomer selected from alkyl acrylate and alkyl methacrylate, or ionomers of the E/X/Y copolymers, wherein X is from about 3 to 35 weight % of the E/X/Y copolymer, and Y is from 0 to about 35 weight % of the E/X/Y copolymer and wherein from about 0% to about 90% of the carboxylic acid in X is neutralized; and at least one additional polymeric layer (iii) consisting essentially of a copolymer of ethylene and vinyl acetate or a copolymer of ethylene and an alkyl (meth) acrylate. 36. A package comprising a film of claim 1. 37. A package comprising a film of claim 20.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.