EVOH barrier film with reduced autoclave shock
AssigneeCryovac, Inc.
InventorsWalter B Mueller, Patrick W. Thompson
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Abstract
The presently disclosed subject matter is directed to a barrier film that maintains an oxygen barrier after being subjected to autoclaving conditions. The film comprises one EVOH layer positioned as a core layer, and one EVOH layer positioned directly adjacent to an outer layer comprising highly permeable material having a moisture vapor permeability greater than about 40 g-mil/100 in2-day-atm. During autoclaving, the barrier properties of the EVOH layer positioned adjacent to the outer layer allows improved recovery of oxygen barrier properties. In addition, during rewetting applications, the internal EVOH layer maintains the oxygen barrier. Also disclosed are methods of making and using the disclosed barrier film.
Claims26
A multilayer barrier film comprising:
- a. a first layer comprising a high permeable material having a moisture vapor permeability greater than about 40 g-mil/100 in2-day-atm;
- b. a second layer directly adjacent to the first layer comprising EVOH;
- c. a first region defining a third layer in direct contact with the second layer comprising 1 to 5 distinct sublayers comprising low permeable materials having moisture vapor permeability of less than about 20 g-mil/100 in2-day-atm;
- d. a fourth layer comprising EVOH;
- e. a second region defining a fifth layer in direct contact with the fourth layer comprising 1 to 5 sublayers comprising very low permeable materials having a moisture vapor transmission rate of less than about 5 g/100 in2-day-atm.
A package comprising:
- a. An oxygen sensitive product;
- and
- b. a sealed pouch containing the oxygen sensitive product, the pouch constructed from a film comprising:
- i. a first layer comprising a high permeable material having a moisture vapor permeability greater than about 40 g-mil/100 in2-day-atm;
- ii. a second layer directly adjacent to the first layer comprising EVOH;
- iii. a first region defining a third layer in direct contact with the second layer comprising 1 to 5 distinct sublayers comprising low permeable materials having moisture vapor permeability of less than about 20 g-mil/100 in2-day-atm;
- iv. a fourth layer comprising EVOH;
- v. a second region defining a fifth layer in direct contact with the fourth layer comprising 1 to 5 sublayers comprising very low permeable materials having a moisture vapor transmission rate of less than about 5 g/100 in2-day-atm.
A package comprising:
- a. a first pouch containing an oxygen sensitive product;
- and
- b. a second pouch containing the first pouch and the oxygen sensitive product, said second pouch constructed from a film comprising:
- i. a first layer comprising a highly permeable material having a moisture vapor permeability greater than about 40 g-mil/100 in2-day-atm;
- ii. a second layer directly adjacent to the first layer comprising EVOH;
- iii. a first region defining a third layer in direct contact with the second layer comprising 1 to 5 distinct sublayers comprising low permeable materials having moisture vapor permeability of less than about 20 g-mil/100 in2-day-atm;
- iv. a fourth layer comprising EVOH;
- v. a second region defining a fifth layer in direct contact with the fourth layer comprising 1 to 5 sublayers comprising very low permeable materials having a moisture vapor transmission rate of less than about 5 g/100 in2-day-atm.
Dependencies are inferred from the claim text.