The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2017
Filed:
Aug. 01, 2014
Mitsui Chemicals, Inc., Minato-ku, Tokyo, JP;
Akinori Ryu, Arao, JP;
MITSUI CHEMICALS, INC., Tokyo, JP;
Abstract
The process for producing photochromic optical materials of the present invention includes a step (i) of reacting at least one polymerizable monomer (A) having two or more ethylene-based unsaturated groups with at least one polythiol (B) having two or more mercapto groups to obtain a prepolymer; a step (ii) of mixing the prepolymer and a photochromic compound (C) to obtain a polymerizable composition; and a step (iii) of polymerizing the polymerizable composition, wherein, before the reaction of the step (i), the molar number of the mercapto groups included in the polythiol (B) is smaller than the molar number of the ethylene-based unsaturated groups included in the polymerizable monomer (A).