| US 7,537,829 B2 | ||
| Multi-layer films having improved sealing properties | ||
| Salvatore J. Pellingra, Jr., Wolcott, N.Y. (US); and Michael J. Bader, Fairport, N.Y. (US) | ||
| Assigned to ExxonMobil Oil Corporation, Irving, Tex. (US) | ||
| Filed on Apr. 01, 2005, as Appl. No. 11/96,298. | ||
| Application 11/096298 is a continuation in part of application No. 10/079662, filed on Feb. 20, 2002, abandoned. | ||
| Application 10/079662 is a continuation in part of application No. 09/791325, filed on Feb. 22, 2001, abandoned. | ||
| Claims priority of provisional application 60/559369, filed on Apr. 02, 2004. | ||
| Prior Publication US 2005/0238874 A1, Oct. 27, 2005 | ||
| Int. Cl. B32B 27/08 (2006.01); B32B 27/18 (2006.01); B32B 27/32 (2006.01); B32B 7/12 (2006.01) | ||
| U.S. Cl. 428—336 [428/334; 428/339; 428/343; 428/346; 428/347; 428/349; 428/355 EN; 428/500; 428/515; 428/516; 428/520; 428/522; 428/523] | 21 Claims |
| 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.).
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