US Patent Issued to Nippon Kayaku on March 17 for "Inkjet ink, ink set, ink medium set, and printing medium" (Japanese Inventors)

ALEXANDRIA, Va., March 17 -- United States Patent no. 12,577,421, issued on March 17, was assigned to Nippon Kayaku K.K. (Tokyo).

"Inkjet ink, ink set, ink medium set, and printing medium" was invented by Shunta Misawa (Tokyo) and Keishiro Yoshida (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An inkjet ink which contains a pigment, a water-soluble organic solvent, and an organic compound (but excluding the pigment and the water-soluble organic solvent), and in which the log P value of the water-soluble organic solvent is less than 1.258, the interface tension of the organic compound with respect to OPP is less than 20.7 mN/m, the value of (B)/(A) is 0.01-0.50 where (A) represents the total mass of th...