US Patent Issued to Kaneka on Feb. 25 for "Transparent polyimide film and production method therefor" (Japanese Inventors)

ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,234,323, issued on Feb. 25, was assigned to Kaneka Corp. (Japan).

"Transparent polyimide film and production method therefor" was invented by Takashi Ando (Settsu, Japan), Kohei Ogawa (Settsu, Japan) and Masahiro Miyamoto (Settsu, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a transparent polyimide film containing a polyimide and a phosphate ester. The content of the phosphate ester based on 100 parts by mass of the polyimide is 3 parts by mass or more, preferably 5 to 100 parts by mass. It is preferable to use a phosphate ester that has a high birefringence reduction effect and with which a decrease in the tensi...