US Patent Issued to TOYOBO on Sept. 15 for "Biaxially oriented polyester film" (Japanese Inventors)

ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,735,541, issued on Sept. 15, was assigned to TOYOBO Co. LTD. (Osaka, Japan).

"Biaxially oriented polyester film" was invented by Kiwamu Kawai (Tsuruga, Japan), Akira Shimizu (Tsuruga, Japan) and Kenji Yoshino (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a biaxially oriented polyester film in which poor flatness that may be caused during heat processing is suppressed. In the biaxially oriented polyester film, the content rate of an ester constituting unit derived from an isophthalic acid component is 0.5-5.0 mol % with respect to 100 mol % of all ester constituting units, the amount of change in haze of the film is 5.0% or le...