Polymeric film
AssigneeImperial Chemical Industries PLC
InventorsPaul D. A. Mills, Anton R. Olek, Junaid A. Siddiqui
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Abstract
A polymeric film, particularly a polyester film, comprising an essentially unfilled primary layer substrate and a filled secondary layer exhibiting an improved combination of transparency and handling properties. The filler is glass particles having a volume distributed median particle diameter of 1.0 to 7.0 .mu.m, which are present in the secondary layer at a concentration of 100 to 1000 ppm. The film is suitable for use in a vide range of applications, particularly for information storage and display.
Claims7
A polymeric film consisting essentially of an unfilled primary layer of a synthetic film-forming polymeric material having on at least one surface thereof a secondary layer consisting essentially of a synthetic film-forming polymeric material including, based upon the weight of the polymer in the secondary layer, 100 to 1000 ppm of glass particles having a volume distributed median particle diameter of 1.0 to 7.0 .mu.m.
A method of producing a polymeric film consisting essentially of forming a primary layer of synthetic film-forming unfilled polymeric material having on at least one surface thereof a secondary layer consisting essentially of a synthetic film-forming polymeric material including, based upon the weight of the polymer in the secondary layer, 100 to 1000 ppm of glass particles having a volume distributed medium particle diameter of 1.0 to 7.0 .mu.m.
Dependencies are inferred from the claim text.