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US 7,118,790 B2Granted
Process for producing coated polymeric articles and the articles produced thereby
AssigneeHoechst Trespaphan GmbH
InventorRavi Prasad
Life of this patent
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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.
Claims11
A coated polymeric article comprising a film comprising:
- (a) a coextruded polypropylene substrate consisting of a first outer surface of a maleic anhydride modified polypropylene layer and a second outer surface of a selected polypropylene layer;
- and
- (b) a polysilicate coating on the maleic anhydride modified polypropylene layer,
- wherein component (a) is stretched approximately 4 to 5 times in the machine direction, followed by transverse stretching approximately 9 to 10 times, such that a thickness of component (a) in the range of about 0.5 to about 2 mil was achieved prior to coating;
- and wherein said coated polymeric article has an oxygen transmission rate of 3 to 15 cc/m2/day at 1 bar, 23° C. and 50% relative humidity.
2 more elements
A coated polymeric film comprising:
- (a) a coextruded polypropylene substrate consisting of a first outer surface of a maleic anhydride modified polypropylene layer and a second outer surface of a selected polypropylene layer;
- and
- (b) a polysilicate coating on the maleic anhydride modified polypropylene layer,
- wherein component (a) is stretched approximately 4 to 5 times in the machine direction, followed by transverse stretching approximately 9 to 10 times, such that a thickness of component (a) in the range of about 0.5 to about 2 mil was achieved prior to coating;
- and wherein said coated polymeric film has an oxygen transmission rate of 3 to 15 cc/m2/day at 1 bar, 23° C. and 50% relative humidity.
2 more elements
Dependencies are inferred from the claim text.