Title:
PHOTOCHROMIC SPIROPIRANE COMPOUND
Document Type and Number:
Japanese Patent JPS6366178
Kind Code:
A
Abstract:
A series of novel photochromic spiropyrans are disclosed in which a spiro-adamantane group is introduced into the 2-position of the benzopyran or naphthopyran ring. The spiropyran compounds of the invention exhibit heliochromic properties, i.e. they colour in sunlight and fade rapidly at ambient temperatures in the absence of U.V. light, making them good candidates for use in the manufacture of sunglasses. The invention includes lenses which darken in sunlight and incorporate the novel spiropyrans and a process for the preparation of the spiropyran compounds.
Inventors:
HARII JIYOOJI HERAA
SUTEFUEN NIIGERU ORIBAA
JIYON FUITSUTOORU
AIAN TOMURINSON
SUTEFUEN NIIGERU ORIBAA
JIYON FUITSUTOORU
AIAN TOMURINSON
Application Number:
JP11719687A
Publication Date:
March 24, 1988
Filing Date:
May 15, 1987
Export Citation:
Assignee:
PLESSEY CO PLC
International Classes:
C07D311/96; C07D407/04; C07D409/04; C07D491/107; C07D493/04; C07D495/04; C08K5/1545; C09K9/02; G02B1/04; G03C1/72; (IPC1-7): C07D311/96; C09K9/02
Attorney, Agent or Firm:
Suzuki Ikuo