US Patent Issued to IDEMITSU KOSAN on July 7 for "Polycarbonate-polyorganosiloxane copolymer" (Japanese Inventors)

ALEXANDRIA, Va., July 7 -- United States Patent no. 12,674,033, issued on July 7, was assigned to IDEMITSU KOSAN Co. LTD. (Tokyo).

"Polycarbonate-polyorganosiloxane copolymer" was invented by Yasuhiro Ishikawa (Ichihara, Japan), Hajime Watanabe (Ichihara, Japan) and Aki Yamada (Ichihara, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A polycarbonate-polyorganosiloxane copolymer comprises a polycarbonate block (A-1) formed of a repeating unit with a specific structure and a polyorganosiloxane block (A-2) containing a repeating unit with a specific structure. A difference between the haze value (haze A) after retention for 3 minutes and the haze value (haze B) after retention for 20 minutes, of the polyc...