Film layers and methods for forming the same

A multilayer film, comprising:

• a first film layer and a second film layer sealed to said first film layer, at least one of said first film layer or said second film layer comprising;
• a first polymer comprising the reaction product of,
• chlorotrifluoroethene, and
• vinylidene fluoride utilized in said first polymer in an amount of at least 4 wt. % based on a total weight of all reactants utilized to form said first polymer, and
• a second polymer comprising the reaction product of,
• chlorotrifluoroethene, and
• optionally, vinylidene fluoride utilized in said second polymer in an amount of less than 4 wt. % based on a total weight of all reactants utilized to form said second polymer.

A multilayer film, comprising:

• a first film layer and a second film layer sealed to said first film layer, at least one of said first film layer or said second film layer comprising a first polymer comprising the reaction product of;
• chlorotrifluoroethene, and
• vinylidene fluoride utilized in said first polymer in an amount of at least 4 wt. % based on a total weight of all reactants utilized to form said first polymer;
• and
• a cavity defined between said first film layer and said second film layer, said first film layer and said second film layer are in contact at an interface disposed about said cavity, said interface comprises a first portion having a first seal strength and a second portion having a second seal strength, said first seal strength is lower than said second seal strength.

A method for forming a multilayer film, the multilayer film comprising a first film layer and a second film layer, said method comprising:

• providing a first polymer comprising the reaction product of;
• chlorotrifluoroethene, and
• vinylidene fluoride utilized in the first polymer in an amount of at least 4 wt. % based on total weight of all reactants utilized to form the first polymer;
• extruding the first polymer to form at least one of the first film layer or the second film layer;
• and
• heat sealing the first film layer and the second film layer together at an interface to form the multilayer film, the interface comprises a first portion having a first seal strength and a second portion having a second seal strength, the first seal strength is lower than the second seal strength.