Title:
PHOTOCHROMIC COMPOUND, PHOTOCHROMIC COMPOSITION, PHOTOCHROMIC ARTICLE, AND EYEGLASSES
Document Type and Number:
Japanese Patent JP2023111570
Kind Code:
A
Abstract:
To provide a photochromic article with a fast fading rate.SOLUTION: The present invention provides a photochromic compound expressed by general formula 1. In general formula 1, R represents a ring structure that is spiro-fused to an indeno-fused naphthopyran, the structure being a substituted or unsubstituted ring structure where the number of carbon atoms is from 3 to 20 inclusive (including the carbon atom at position 13 of the indeno-fused naphthopyran); and R1-R4, B and B' each independently represent a hydrogen atom or a substituent.SELECTED DRAWING: None
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Inventors:
KAWAKAMI HIRONORI
KOBAYASHI TAKASHI
HIGUCHI TSUYOSHI
KOBAYASHI TAKASHI
HIGUCHI TSUYOSHI
Application Number:
JP2022013482A
Publication Date:
August 10, 2023
Filing Date:
January 31, 2022
Export Citation:
Assignee:
HOYA LENS THAILAND LTD
International Classes:
C09K9/02; C07D311/04; C07D413/10; C09B57/00; G02C7/10
Attorney, Agent or Firm:
Sykes Patent Attorney Corporation