Heat sealable packaging materials having a peelable, easy-opening feature

Abstract

A heat sealable, co-extruded multi-layer packaging film with a peelable, easy-opening feature, comprising a first layer which comprises a blend of polypropylene and a primary resin. The primary resin may comprise ionomers or other acid copolymers, ethylene vinyl acetate, low density polyethylene, or linear low density polyethylene. The first layer is disposed in contact with a second outer layer, which is a heat sealant layer, comprising polybutylene. The heat sealant layer separates from said first layer when force is applied to the heat seal. The film may be laminated to additional components, and may be heat sealed to itself or to a similar film to form a package.

What is claimed is: 
     
       1. A multilayer, heat sealable polymeric film, comprising a first interior layer comprising polypropylene and a polymer selected from the group consisting of an ionomer, an acid copolymer, EVA, LDPE, and LLDPE; a second outer layer comprising polybutylene and a polymer selected from the group consisting of LDPE, LLDPE, EVA, EAA, and an ionomer, said second outer layer being heat sealable; said first interior layer and said second outer layer being disposed in face-to-face contact, wherein said first interior layer and said second outer layer form a delamination type peelable seal. 
     
     
       2. A film as described in claim 1, wherein said film is coextruded. 
     
     
       3. A film as described in claim 1, wherein said first interior layer is laminated to a substrate. 
     
     
       4. A film as described in claim 1, wherein said substrate is selected from the group consisting of paper, cardboard, and metal. 
     
     
       5. A package made from the film of any of claims 1 to 4, wherein said first interior layer is heat sealed to itself. 
     
     
       6. A package made from the film of any of claims 1 to 4, wherein said first interior layer is heat sealed to a second polymeric film.