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Patent Searching and Data


Title:
CHROMENE COMPOUND
Document Type and Number:
WIPO Patent Application WO/2003/042203
Kind Code:
A1
Abstract:
A chromene compound represented by the following general formula (1): wherein R1 to R4 each is hydrogen, alkyl, etc. or R1 to R4 may be bonded to each other to form a ring; R5 and R6 each is alkyl, aryl, etc. or R5 and R6 in combination may form a ring; the cyclic group respectively containing X and Y each is an aromatic hydrocarbon group or aromatic heterocyclic group; and the bivalent group Z is alkylene, etc. The compound has excellent photochromic characteristics in that it shows reduced initial coloration, has a high fading rate and excellent durability, and develops an intermediate color tone.

Inventors:
IZUMI SHINOBU (JP)
NAGOH HIRONOBU (JP)
Application Number:
PCT/JP2002/011935
Publication Date:
May 22, 2003
Filing Date:
November 15, 2002
Export Citation:
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Assignee:
TOKUYAMA CORP (JP)
IZUMI SHINOBU (JP)
NAGOH HIRONOBU (JP)
International Classes:
C07D311/78; C07D311/94; C07D311/96; C07D491/06; C07D493/06; G02B1/04; G03C1/73; (IPC1-7): C07D311/78; C07D311/94; C07D491/06; C07D493/06; C07D311/96; G03C1/73; G02B5/23; G02B1/04; G02C7/10
Domestic Patent References:
WO2000015628A12000-03-23
WO2000077007A12000-12-21
WO2002090342A12002-11-14
Foreign References:
US4578469A1986-03-25
Other References:
See also references of EP 1445257A4
Attorney, Agent or Firm:
Ono, Hisazumi (Nishi-Shimbashi 1-chome Minato-ku, Tokyo, JP)
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