Manufacturing process for coated polyester film
AssigneeDuPont Teijin Films U.S. Limited Partnership
InventorsRobert William Eveson, Andrew Nathan Hodgson, Duncan Henry MacKerron, Katsuyuki Hashimoto
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Abstract
A biaxially oriented composite film includes a polyester substrate supporting one or more coatings on one or both surfaces of said substrate, wherein the polyester substrate is a biaxially oriented film; wherein the one or more coatings is/are derived from a predominantly inorganic hardcoat coating composition including inorganic particles contained in a polymerisable predominantly inorganic matrix; and wherein the biaxially oriented composite film has been annealed at a temperature Ta (° C.) above Tg where Tg<Ta≦Tg+100 (° C.) for a time t after thermal equilibrium where 1 hour ≦t≦72 hours. A method of making the film is provided.
Claims31
A method of producing a biaxially oriented composite film comprising a polyester substrate supporting one or more coatings on one or both surfaces of said substrate, wherein said polyester substrate is a biaxially oriented film, said method comprising the steps of:
- disposing on one or both surfaces of said polyester substrate said coating wherein said coating is derived from a predominantly inorganic hardcoat coating composition comprising inorganic particles contained in a polymerisable predominantly inorganic matrix;
- and
- subsequently annealing said biaxially oriented composite film at a temperature Ta (° C.) above Tg where Tg<Ta≦Tg+100 (° C.) for a time t after thermal equilibrium where 1 hour ≦t≦72 hours.
A biaxially oriented composite film comprising a polyester substrate supporting one or more coatings on one or both surfaces of said substrate,
- wherein said polyester substrate is a biaxially oriented film;
- wherein said one or more coatings is/are derived from a predominantly inorganic hardcoat coating composition comprising inorganic particles contained in a polymerisable predominantly inorganic matrix;
- and
- wherein the biaxially oriented composite film has been annealed at a temperature Ta (° C.) above Tg where Tg<Ta≦Tg+100(° C.) for a time t after thermal equilibrium where 1 hour ≦t≦72 hours.
Dependencies are inferred from the claim text.