US Patent Issued to DIC on Oct. 21 for "Pigment composition, printing ink, and method for manufacturing pigment composition" (Chinese, Japanese Inventors)

ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,448,531, issued on Oct. 21, was assigned to DIC Corp. (Tokyo).

"Pigment composition, printing ink, and method for manufacturing pigment composition" was invented by Shumei Ji (Qingdao, China), Issei Masuko (Kamisu, Japan), Masaki Hosaka (Kamisu, Japan), Kyoichi Okada (Kamisu, Japan), Nagatoshi Kobayashi (Kamisu, Japan), Xiyang Liao (Qingdao, China) and Wei Zhao (Qingdao, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The issue of the present invention is to provide a disazo pigment in which the polychlorinated biphenyl (PCB) content in addition to the primary aromatic amine (PAA) content is reduced. The present invention provides a pigment composi...