US Patent Issued to TOYOBO on July 29 for "Polyester resin and method for producing polyester resin" (Japanese Inventors)

ALEXANDRIA, Va., July 30 -- United States Patent no. 12,371,528, issued on July 29, was assigned to TOYOBO Co. LTD. (Osaka, Japan).

"Polyester resin and method for producing polyester resin" was invented by Satoru Nakagawa (Tsuruga, Japan), Kosuke Uotani (Tsuruga, Japan) and Shinya Kanetaka (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A polyester resin, such as polyethylene terephthalate and a copolymer thereof, that is produced by using a polymerization catalyst containing an aluminum compound, such as an aluminum acetate, and a phosphorus compound, such as a 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid dialkyl ester, that can reduce a catalyst cost, for which polymerization activity is ...