US Patent Issued to 3M Innovative Properties on May 12 for "Polyester copolymers for use in optical films" (Minnesota Inventors)

ALEXANDRIA, Va., May 12 -- United States Patent no. 12,625,313, issued on May 12, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).

"Polyester copolymers for use in optical films" was invented by Stephen A. Johnson (Woodbury, Minn.), Carl A. Stover (St. Paul, Minn.), Kristopher J. Derks (Woodbury, Minn.) and Richard Yufeng Liu (Woodbury, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Polyester copolymeric materials include 40 to 51 mol % substituted naphthalate units, such as dimethyl-2,6-naphthalene dicarboxylate units, 10 to 40 mol % ethylene units, and 10 to 40 mol % hexane units. The polyester copolymers can be used to prepare multi-layer optical films by coextrusion and/or co-stretch...