Patent ID: 11879097
Assignee: TOKUYAMA CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 5:
6. The photochromic compound according to any of claim 1, having a group to form an aliphatic hydrocarbon ring along with the 13-position carbon atom of the indenonaphthopyran moiety, wherein the group to form an aliphatic hydrocarbon ring is a ring selected from:
a cyclopentane ring, a cyclohexane ring, a cycloheptane ring, a cyclooctane ring, a cyclononane ring, a cyclodecane ring, a cycloundecane ring, a cyclododecane ring and a spirodicyclohexane ring, and
the group to form the aliphatic hydrocarbon ring may have 1 to 10 substituents of an alkyl group having 1 to 3 carbon atoms or a cycloalkyl group having 5 to 7 carbon atoms, or
the group to form the aliphatic hydrocarbon ring may be a group of a condensed ring with a cycloalkyl group having 5 to 7 carbon atoms.