US Patent Issued to SK CHEMICALS on Nov. 18 for "Highly heat-resistant polycarbonate ester and preparation method therefor" (South Korean Inventor)

ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,398, issued on Nov. 18, was assigned to SK CHEMICALS Co. LTD. (Seongnam-si, South Korea).

"Highly heat-resistant polycarbonate ester and preparation method therefor" was invented by Kwang Sei Oh (Seoul, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "A heat-resistant, bio-based polycarbonate ester prepared by melt polycondensation of 1,4:3,6-dianhydrohexitol and a carbonate or 1,4-cyclohexanedicarboxylate is disclosed. The heat-resistant, bio-based polycarbonate ester includes a repeat unit 1 of Formula 1, a repeat unit 2 of Formula 2, and a repeat unit 3 of Formula 3. The polycarbonate ester has excellent heat resistance, transparency, a...