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US 5,328,755 AGranted
Polymeric film
AssigneeImperial Chemical Industries PLC
InventorsPaul D. A. Mills, Anton R. Olek, Junaid A. Siddioui
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AssigneeImperial Chemical Industries PLC
InventorsPaul D. A. Mills, Anton R. Olek, Junaid A. Siddioui
Estimating the term…
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 a mixture of glass and silica particles. The glass particles have a volume distributed median particle diameter of 1.0 to 7.0 .mu.m and are present in the secondary layer at a concentration of 50 to 1000 ppm, while the silica particles are present in the range 200 to 2000 ppm and have an average primary particle size of 0.01 to 0.09 .mu.m. The film is suitable for use in a wide range of applications, particularly for information storage and display.
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, (a) 50 to 1000 ppm of glass particles having a volume distributed median particle diameter of 1.0 to 7.0 .mu.m, and (b) 200 to 2000 ppm of silica particles having an average primary particle size of 0.01 to 0.09 .mu.m.
A method of producing a polymeric film consisting essentially of forming a primary layer of unfilled synthetic film-forming polymeric material having on at least one surface thereof a secondary layer of polymeric material including, based upon the weight of the polymer in the secondary layer, (a) 50 to 1000 ppm of glass particles having a volume distributed median particle diameter of 1.0 to 7.0 .mu.m, and (b) 200 to 2000 ppm of silica particles having an average primary particle size of 0.01 to 0.09 .mu.m.
Dependencies are inferred from the claim text.