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US 6,649,235 B2Granted
Process for producing coated polymeric articles and the articles produced thereby
AssigneeHoechst Trespaphan GmbH
InventorRavi Prasad
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Abstract
A method for producing a coated polymeric article by co-extruding polypropylene and a maleic anhydride modified polypropylene, corona-treating, and applying a polysilicate barrier is described. Also provided are films and bottles produced using this method.
Claims8
A method for making a coated polymeric article comprising the steps of:
- (a) co-extruding a selected polyolefin and a maleic anhydride modified polyolefin, thereby producing a polymeric substrate having a first surface of modified maleic anhydride polyolefin and a second surface of polyolefin;
- (b) orienting the polymeric substrate biaxially prior to surface treatment by stretching the substrate up to 5 times in the machine direction and up to 10 times in the transverse direction;
- (c) treating the maleic anhydide surface of the polymeric substrate to permit receipt of a polysilicate barrier coating;
- and
- (d) applying a polysilicate barrier coating to the surface treated polymeric substrate of (c).
2 more elements
Dependencies are inferred from the claim text.