Film and film structures having improved oxygen transmission, forming, and puncture resistances

A packaged food product comprising an article of food requiring an oxygen and/or moist atmosphere selected from the group consisting of case ready meat, fish, sausage and fresh produce enclosed in a multilayer polymer film, wherein at least one layer of said multilayer polymeric film consists essentially of:

• (i) a blend of (a) one or more aliphatic, mono-functional 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 C3 to C8 α,β-ethylenically unsaturated carboxylic acids, and Y is derived from a softening comonomer, or ionomers of said E/X/Y copolymers, wherein X is about 3 to 30 wt. % of said E/X/Y copolymer, and Y is 0 to about 30 wt. % of said E/X/Y copolymer and wherein 100% of all acid moieties of (a) and of (b) are nominally neutralized to the corresponding salts of magnesium, sodium, zinc or mixtures thereof;
• (ii) a metallocene polyethylene having a density of less than 0.91 g/cc;
• or
• (iii) a blend of a metallocene polyethylene having a density of less than 0.91 g/cc and a low density polyethylene;
• and wherein at least one outer layer of said multilayer polymeric film consists essentially of an E/X/Y copolymer where E is derived from ethylene, X is derived from C3 to C8 α,β-ethylenically unsaturated carboxylic acids, and Y is derived from a softening comonomer, or ionomers of said E/X/Y copolymers, wherein X is about 3 to 30 wt. % of said E/X/Y copolymer, and Y is 0 to about 30 wt. % of said E/X/Y copolymer and wherein from 15% to 80% of the acid moieties are neutralized.

An oxygen- and moisture-permeable multilayer polymeric film comprising:

• (i) at least one polymeric layer consisting essentially of an E/X/Y copolymer where E is derived from ethylene, X is derived from C3 to C8 α,β-ethylenically unsaturated carboxylic acids, and Y is derived from a softening comonomer, or ionomers of said E/X/Y copolymers, wherein X is about 3 to 30 wt. % of said E/X/Y copolymer, and Y is 0 to about 30 wt. % of said E/X/Y copolymer and wherein from 15% to 80% of the acid is neutralized;
• (ii) at least one other polymeric layer consisting essentially of a blend of (a) one or more aliphatic, mono-functional 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 C3 to C8 α,β-ethylenically unsaturated carboxylic acids, and Y is derived from a softening comonomer, or ionomers of said E/X/Y copolymers, wherein X is about 3 to 30 wt. % of said E/X/Y copolymer, and Y is 0 to about 30 wt. % of said E/X/Y copolymer and wherein 100% of all acid moieties of (a) and of (b) are nominally neutralized to the corresponding salts of magnesium, sodium, zinc or mixtures thereof;
• and
• (iii) at least one additional polymeric layer consisting 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.

An oxygen and moisture permeable multilayer polymeric film comprising:

• (i) at least one polymeric layer consisting essentially of a blend of (a) one or more aliphatic, mono-functional 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 C3 to C8 α,β-ethylenically unsaturated carboxylic acids, and Y is derived from a softening comonomer, or ionomers of said E/X/Y copolymers, wherein X is about 3 to 30 wt. % of said E/X/Y copolymer, and Y is 0 to about 30 wt. % of said E/X/Y copolymer and wherein 100% of all acids of (a) and of (b) are nominally neutralized to the corresponding salts of magnesium, sodium, zinc or mixtures thereof;
• and
• (ii) at least one additional polymeric layer consisting 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.

An oxygen and moisture permeable multilayer polymeric film comprising:

• (i) at least one polymeric layer consisting essentially of an E/X/Y copolymer where E is derived from ethylene, X is derived from C3 to C8 α,β ethylenically unsaturated carboxylic acids, and Y is derived from a softening comonomer, or ionomers of said E/X/Y copolymers, wherein X is about 3 to 30 wt. % of said E/X/Y copolymer, and Y is 0 to about 30 wt. % of said E/X/Y copolymer and wherein from 15% to 80% of the acid moieties are neutralized;
• and
• (ii) at least one additional polymeric layer consisting 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.