초록 ▼

The present invention relates to a film structure and a method of manufacturing the same. More specifically, the film structure may include a barrier material made from EVOH, nylon or other thermally sensitive barrier material encapsulated by a first adhesive material. The barrier material and the f

The present invention relates to a film structure and a method of manufacturing the same. More specifically, the film structure may include a barrier material made from EVOH, nylon or other thermally sensitive barrier material encapsulated by a first adhesive material. The barrier material and the first adhesive material form a barrier layer and a first set of adhesive layers when coextruded. The barrier layer and the first set of adhesive layers may be coextruded at the same or a similar temperature to form a first extrudate. The extrudate may be encapsulated by or otherwise coextruded with a second adhesive material to form a second extrudate at a higher temperature than the first extrudate that then may be formed into a flat sheet via a die. The first set of adhesive layers protects the barrier layer from high temperatures and long residence times related to the coextrusion/lamination process that may degrade the barrier layer. In addition, acid terpolymer consisting of ethylene/methyl acrylate/acrylic acid adheres a barrier material of EVOH to outer layers of the film structure.

대표청구항 ▼

1. A film structure comprising:a barrier layer comprising ethylene vinyl alcohol copolymer; first adhesive material encapsulating said barrier layer and forming first and second adhesive layers disposed on opposite surfaces of said barrier layer wherein said first adhesive material is selected from

1. A film structure comprising:a barrier layer comprising ethylene vinyl alcohol copolymer; first adhesive material encapsulating said barrier layer and forming first and second adhesive layers disposed on opposite surfaces of said barrier layer wherein said first adhesive material is selected from the group consisting of acid terpolymer, polyolefin having maleic anhydride grafted thereto, and polyamide; a third adhesive layer disposed adjacent to said first adhesive layer wherein said third adhesive layer comprises a polyethylene or polyethylene copolymer; a fourth adhesive layer disposed adjacent to said second adhesive layer wherein said fourth adhesive layer comprises a polyethylene or polyethylene copolymer; a heat sealant layer comprising ethylene vinyl acetate copolymer disposed adjacent to said third adhesive layer; and an outer layer comprising polyester wherein said barrier layer and first, second, third and fourth adhesive layers are extrusion laminated to said outer layer.