Composite fluoropolymer-perfluoropolymer assembly

A sheet comprising:

• a first layer comprising a perhalogenated polymer and optionally one or more adjuvants;
• a second layer comprising a partially-fluorinated polymer and optionally one or more adjuvants;
• and
• a bonding interface between said first layer and said second layer consisting essentially of a first material having the composition of said first layer and a second material having the composition of said second layer.

An article comprising:

• a first layer consisting essentially of a substantially solid thermoplastic perhalogenated polymer and optionally one or more adjuvants;
• a second layer consisting essentially of a substantially solid thermoplastic partially-fluorinated polymer and optionally one or more adjuvants;
• and
• a bonding interface between said first layer and said second layer consisting essentially of a first material having the composition of said first layer and a second material having the composition of said second layer, including any adjuvants.

A process for preparing a layered article comprising:

• a) providing a first layer consisting essentially of a substantially solid perhalogenated polymer and optionally one or more adjuvants;
• b) providing a second layer consisting essentially of a substantially solid partially-fluorinated polymer and optionally one or more adjuvants contacting a surface of the first layer;
• c) heating at least one layer to a temperature above its softening point or melting point for a time sufficient to bond the layers;
• and
• d) optionally pressing said first layer to said second layer, and
• wherein a bonding interface between said first layer and said second layer consists essentially of a first material having the composition of said first layer and a second material having the composition of said second layer.

A method of making a layered article comprising preparing a two-layer subassembly consisting essentially of:

• a) extruding a first layer consisting essentially of a substantially solid perhalogenated polymer and optionally one or more adjuvants;
• and
• b) extruding a second layer consisting essentially of a substantially solid partially-fluorinated polymer and optionally one or more adjuvants contacting a surface of the first layer,
• wherein a bonding interface between said first layer and said second layer consists essentially of a first material having the composition of said first layer and a second material having the composition of said second layer,
• and optionally wherein said first layer and said second layer are bonded while at least one layer is above its melting point or softening point.