US 7,615,270 B2
Films comprising a liquid-absorbant inner layer and an impermeable outer layer
I-Hwa Lee, Wilmington, Del. (US); James Michael McKenna, Hockessin, Del. (US); and Raghuram Narumanchi, Highland Park, Ill. (US)
Assigned to E. I. du Pont de Nemours and Company, Wilmington, Del. (US)
Filed on Nov. 11, 2003, as Appl. No. 10/704,934.
Claims priority of provisional application 60/425604, filed on Nov. 12, 2002.
Prior Publication US 2004/0146610 A1, Jul. 29, 2004
Int. Cl. B29D 22/00 (2006.01); B29D 23/00 (2006.01); B32B 1/08 (2006.01); B32B 27/32 (2006.01)
U.S. Cl. 428—35.2  [428/35.4; 428/34.8; 428/35.7; 428/36.6] 12 Claims
 
1. A laminate film comprising (i) a liquid absorptive inner layer useful for imparting flavor and color evenly to meat, and (ii) an outer impermeable barrier layer wherein:
(A) the liquid absorptive inner layer comprises a block copolyether ester polymer; and
(B) the outer impermeable barrier layer comprises a structure selected from the group consisting of single film layers, multilayer films and laminates, the barrier layer comprising: (a) at least one layer comprising a polymer, wherein the polymer is selected from the group consisting of: polyamides; mixtures of polyamides; ethylene vinyl alcohol copolymers; polyvinylidene chloride; polyolefins; and mixtures of any of these; and (b) optionally at least one tie layer;
wherein the liquid absorptive inner layer has a moisture vapor transmission rate of from about 1200 to about 20,000 g 25 micron/m2 24 hrs.