US Patent Issued to Zhejiang Wansheng on March 18 for "Preparation method of cardanol-modified polyamine curing agent with high corrosion resistance" (Chinese Inventors)

ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,581, issued on March 18, was assigned to Zhejiang Wansheng Co. Ltd (Zhejiang, China).

"Preparation method of cardanol-modified polyamine curing agent with high corrosion resistance" was invented by Qiuwei Wang (Zhejiang, China), Qi Gu (Zhejiang, China), Xufeng Li (Zhejiang, China), Jian Chen (Zhejiang, China) and Yunxing Lv (Zhejiang, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention discloses a preparation method of a cardanol-modified polyamine curing agent with high corrosion resistance. The method includes the following steps: subjecting cardanol, paraformaldehyde and an amine compound to Mannich reaction, after the Man...