MUMBAI, India, Nov. 7 -- Intellectual Property India has published a patent application (202537100318 A) filed by Tokuyama Corporation, Yamaguchi, Japan, on Oct. 16, for 'photochromic compound, propargyl alcohol compound, curable composition, optical article, lens, and spectacles.'
Inventor(s) include Miyazaki Masayuki.
The application for the patent was published on Nov. 7, under issue no. 45/2025.
According to the abstract released by the Intellectual Property India: "The purpose of the present invention is to provide: a photochromic compound having an excellent color fading rate and excellent durability; a propargyl alcohol compound that can serve as an intermediate for this photochromic compound; and a curable composition, an optical article, a lens, and spectacles each including this photochromic compound. Provided according to embodiments is a photochromic compound having a skeleton represented by formula (1). In formula (1), R3 is an aryl group or a heteroaryl group substituted with a group represented by formula (1a). In formula (1a), R1 is a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted fused polycycle in which an aromatic ring or an aromatic heterocycle has been fused to these substituents. R2 is a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted haloalkyl group, a substituted or unsubstituted cycloalkyl group, a group represented by formula (2a), or the like."
The patent application was internationally filed on July 05, 2023, under International application No.PCT/JP2023/024970.
Disclaimer: Curated by HT Syndication.
