[미국특허]
Multi-layer films having improved sealing properties
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-027/08
B32B-027/18
B32B-027/32
B32B-007/12
출원번호
UP-0096298
(2005-04-01)
등록번호
US-7537829
(2009-07-01)
발명자
/ 주소
Pellingra, Jr., Salvatore J.
Bader, Michael J.
출원인 / 주소
ExxonMobil Oil Corporation
인용정보
피인용 횟수 :
5인용 특허 :
34
초록▼
Multi-layer films that are suitable for packaging and having improved sealing properties are disclosed. Some embodiments may also provide a lower minimum sealing temperature. A soft polymer is blended in a core layer and a tie layer comprising the soft polymer and, optionally, another polymer. A sea
Multi-layer films that are suitable for packaging and having improved sealing properties are disclosed. Some embodiments may also provide a lower minimum sealing temperature. A soft polymer is blended in a core layer and a tie layer comprising the soft polymer and, optionally, another polymer. A sealable layer is provided on the side of the tie layer opposite the core layer. The multi-layer films may be transparent, contain a cavitating agent, or are pigmented to form an opaque film. Also, the multi-layer film may be metallized or coated with a barrier coating.
대표청구항▼
We claim: 1. A multi-layer film, comprising: (a) a core layer having a first side and a second side, said core layer comprising a core polymer and at least one soft polymer; (b) a first tie layer having a first side and a second side, the second side of the first tie layer on the first side of said
We claim: 1. A multi-layer film, comprising: (a) a core layer having a first side and a second side, said core layer comprising a core polymer and at least one soft polymer; (b) a first tie layer having a first side and a second side, the second side of the first tie layer on the first side of said core layer, said first tie layer comprising a soft polymer and, optionally, a tie layer polymer, the optional tie layer polymer comprising at least one of a C2-C8 alpha-olefin homo-, co-, or terpolymer, a metallocene catalyzed homo-, co-, or terpolymer comprising propylene, and blends thereof; and (c) a sealant layer on the first side of the first tie layer, wherein the soft polymer of at least one of the first tie layer and the core layer comprises a polymer having a flexural modulus of less than or equal to about 80 Kpsi and a Vicat softening point of less than or equal to about 221° F. (105° C.), wherein a seal formed by a crimp sealer of 200 gram/in weight, 20 psi pressure and 0.75 sec dwell time of said sealant layer to itself has a minimum seal temperature of less than or equal to about 180° F. (82.2° C.). 2. The multi-layer film of claim 1, wherein the seal of the sealant layer to itself has a seal strength of greater than about 600 grams per inch for a seal formed on the crimp sealer at a temperature of at least 200° F. (93.3° C.). 3. The multi-layer film of claim 1, wherein the soft polymer of the core layer comprises between about five percent by weight and about 40 percent by weight of said core layer. 4. The multi-layer film of claim 1, wherein the soft polymer of the core layer comprises between about 10 percent by weight and about 30 percent by weight of said core layer. 5. The multi-layer film of claim 1, wherein the core polymer comprises propylene. 6. The multi-layer film of claim 1, wherein the soft polymer of the first tie layer comprises at least about 25 percent by weight of the first tie layer. 7. The multi-layer film of claim 1, wherein the soft polymer of at least one of the first tie layer and the core layer comprises a polymer having a melting point temperature of less than or equal to about 288° F. (142° C.). 8. The multi-layer film of claim 1, wherein the soft polymer of at least one of the first tie layer and the core layer comprises a polymer having a flexural modulus of less than or equal to about 50 Kpsi. 9. The multi-layer film of claim 1, wherein the first tie layer further comprises an adhesive resin. 10. The multi-layer film of claim 1, wherein the sealant layer has a thickness of between about 0.02 mil and about 1.0 mil (0.5 μm-25 μm). 11. The multi-layer film of claim 1, wherein the sealant layer comprises a sealant-layer polymer selected from the group consisting of Zeigler-Natta or metallocene catalyzed; PP homopolymer, an EP copolymer, a PB copolymer, an EB copolymer, an EPB terpolymer, an ethylene vinyl acetate, and blends thereof. 12. The multi-layer film of claim 1, wherein at least one of the core layer and the first tie layer further comprises a hydrocarbon resin or antiblock. 13. The multi-layer film of claim 1, wherein at least one of the core layer and the first tie layer further comprises at least one additive selected from the group consisting of: i) an opacifying agent selected from the group consisting of iron oxide, carbon black, aluminum, titanium dioxide (TiO2), talc, and combinations thereof ii) a void-initiating particle selected from the group consisting of polybutylene terephthalate, calcium carbonate (CaCO3), and combinations thereof and iii) a hydrocarbon resin, the hydrocarbon resin comprising petroleum resin, terpene resin, styrene resin, cyclopentadiene resin, saturated alicyclic resin, and combinations thereof, said resin having a number average molecular weight of less than 5000, said resin having a softening point in the range of from 60°-180° C. 14. The multi-layer film of claim 1, wherein the film is formed as a package. 15. The package of claim 14, wherein the package is a pouch. 16. A multi-layer film, comprising: (a) a core layer having a first side and a second side, said core layer comprising a core polymer and at least one soft polymer; (b) a first tie layer having a first side and a second side, the second side of the first tie layer on the first side of said core layer, said first tie layer comprising a soft polymer and, optionally, a tie layer polymer, the optional tie layer polymer comprising at least one of a C2-C8 alpha-olefin homo-, co-, or terpolymer, a metallocene catalyzed homo-, co-, or terpolymer comprising propylene, and blends thereof; and (c) a sealant layer on the first side of the first tie layer, wherein the soft polymer of at least one of the first tie layer and the core layer comprises a polymer having a flexural modulus of less than or equal to about 80 Kpsi and a Vicat softening point of less than or equal to about 221° F. (105° C.), further comprising: an outer skin layer having a first side and a second side, the first side of the outer skin layer on the second side of the core layer, the outer skin layer comprising a polymer selected from the group consisting of polyethylene (PE), polypropylene (PP), ethylene-propylene (EP) copolymer, ethylene-propylene-butylene (EPB) terpolymer, an ethylene-vinyl alcohol (EVOH) polymer, and blends thereof: a second tie layer having a first side and a second side, the first side of the second tie layer is on the second side of the core layer and the second side of the second tie layer is on the first side of the outer skin layer, wherein the second tie layer comprises at least one of a propylene polymer, a soft polymer, and an adhesive resin, wherein the soft polymer of the second tie layer comprises between about 10 percent and 90 percent by weight of said second tie layer. 17. The multi-layer film of claim 16, wherein the propylene polymer is isotactic polypropylene, the adhesive resin comprises maleic-anhydride modified polypropylene, and the soft polymer of the second tie layer is the soft polymer of the first tie layer. 18. The multi-layer film of claim 16, wherein the second side of the outer skin layer is treated with a treatment selected from the group consisting of corona, flame, polarized flame, and plasma. 19. The multi-layer film of claim 18, wherein the second side of the outer skin layer is coated with at least one coating selected from the group consisting of EVOH, acrylic polymers, polyvinylidene chloride (PVDC), ethylene acrylic acid copolymers (EAA), ethylene methyl acrylate copolymers (EMA), poly(vinyl)alcohol (PVOH), and combinations thereof. 20. The multi-layer film of claim 18, wherein the second side of the outer skin layer is metallized. 21. The multi-layer film of claim 20, wherein the outer skin layer is metallized by vacuum deposition of a metal selected from the group consisting of aluminum, copper, silver, chromium, and mixtures thereof.
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