White, biaxially oriented polyester film with cycloolefin copolymer and process for producing the film
AssigneeMitsubishi Polyester Film GmbH
InventorJeffrey R. Rounsley
Life of this patent
Estimating the term…
Abstract
A method of controlling the gloss of a white biaxially oriented polyester film. The film will include at least one layer containing a cycloolefin copolymer at a concentration of about 4 to about 60% by weight of that layer. The method includes the step of stretching the film in a machine direction to a ratio of about 2.3 to about 3.4 to obtain desired gloss characteristics.
Claims15
A method of controlling the gloss of a white, biaxially oriented polyester film, wherein said film comprises at least one layer containing a cycloolefin copolymer at a concentration of about 4 to about 60% by weight of said layer, said method including the step of:
- stretching said film in a machine direction to a ratio of about 2.3 to about 3.4.
A method of forming a white, biaxially oriented polyester film having a gloss on at least one face of greater than about 70 at 20 degrees Celsius, wherein said film comprises at least one layer containing a cycloolefin copolymer at a concentration of about 4 to about 60% by weight of said layer, where the glass transition temperature of the cycloolefin copolymer is within the range from about 70 to about 270 degrees Celsius, said method including the step of:
- stretching said film in a machine direction to a ratio of about 3.0 to about 3.4.
A method of forming a white, biaxially oriented polyester film having a gloss on at least one face of less than about 50 at 20 degrees Celsius, wherein said film comprises at least one layer containing a cycloolefin copolymer at a concentration of about 4 to about 60% by weight of said layer, where the glass transition temperature of the cycloolefin copolymer is within the range from about 70 to about 270 degrees Celsius, said method including the step of:
- stretching said film in a machine direction to a ratio of about 2.3 to about 2.6.
Dependencies are inferred from the claim text.