ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,479,941, issued on Nov. 25, was assigned to Henghe Materials & Science Technology Co. Ltd. (Zhejiang, China).
"Preparation method of BOPP film stiffening agent" was invented by Meng Jun Yang (Zhejiang, China), Bin Wang (Zhejiang, China) and Xiang Dong Sun (Zhejiang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a preparation method of a BOPP film stiffening agent, including: taking cyclopentadiene or a derivative thereof and a norbornene monomer or C8 cycloolefin as a polymerization raw material, obtaining a polymerization resin liquid by continuous high-temperature polymerization, then preparing high-softening-po...