초록 ▼

A multi layer film having enhanced barrier properties against transmission of oxygen and water vapor is provided. The multi layer film includes a polypropylene base layer, with a high density polyethylene layer on at least one surface of the polypropylene base layer. The polyethylene layer includes

A multi layer film having enhanced barrier properties against transmission of oxygen and water vapor is provided. The multi layer film includes a polypropylene base layer, with a high density polyethylene layer on at least one surface of the polypropylene base layer. The polyethylene layer includes a surface which has been subjected to plasma treatment with a hydroxyl-donating material such as a methanol. The film further includes a metal layer deposited on the plasma treated surface, such as a layer of vacuum deposited aluminum. Multi layer films according to the present invention are particularly useful as packaging films for food products.

대표청구항 ▼

[ What is claimed is:] [1.] A multi-layer film comprising:a polypropylene base layer;a high density polyethylene layer adhered to at least one side of said polypropylene base layer, said polyethylene layer having an exposed surface, said polyethylene layer being provided with a plasma coating of hyd

[ What is claimed is:] [1.] A multi-layer film comprising:a polypropylene base layer;a high density polyethylene layer adhered to at least one side of said polypropylene base layer, said polyethylene layer having an exposed surface, said polyethylene layer being provided with a plasma coating of hydroxyl groups from plasma deposition of a hydroxyl donating material selected from the group consisting of methanol, ethanol, propanol, butanol and mixtures thereof on said exposed surface; anda metal layer deposited on said polyethylene layer.