Self-adhering packaging film and process for preparing it.

摘要

This invention is in the field of plastics films for packaging. It is concerned with the problem of causing surfaces of the packaging film to self-adhere (self-weld) so as to provide a second seal and close off the parts of the package not in contact with the packaged article.

The solution of the invention involves a packaging film of a blend of at least two ethylene polymers, one of the polymers having a melt flow substantially greater than that of the other. The film may be a single film or a surface layer (101) of a multi-ply film (laminate) (100'). Preferred ethylene polymers for the blend are the ethylene-vinyl acetate copolymers wherein one copolymer has a melt flow of less than 5.0 and the other has a melt flow greater than 28.0. Preferably the multi-ply film has 4 layers (104, 103, 102, 101)