Title:
光互変性スピロフルオレノピランおよびその使用
Document Type and Number:
Japanese Patent JP4884578
Kind Code:
B2
Abstract:
Photochromic spirofluorenopyran compounds corresponding to the general formula (I):in which B, B', R1 to R4 and G have the meanings defined herein. The compounds of the invention are useful in the production of photochromic articles, particularly articles made of synthetic resin materials, and exhibit rapid darkening and brightening rates, as well as long useful service lives. By appropriate selection of substituents, it is possible to adjust the properties of the compounds such as absorption maxima (color), brightening rate, etc.
Inventors:
Claudia Man
Udo Veigand
Manfred Meltz
Udo Veigand
Manfred Meltz
Application Number:
JP15278899A
Publication Date:
February 29, 2012
Filing Date:
May 31, 1999
Export Citation:
Assignee:
Rodenstock. Gezel Shaft. Mitt. Beschlenktel. Haftung
International Classes:
C07D311/94; C09B57/00; C07D311/96; C07D493/10; C09K9/02; G02B1/04; G03C1/73; G02B5/23
Foreign References:
| WO1996014596A1 | ||||
| WO1997048762A1 | ||||
| WO1997048993A1 |
Attorney, Agent or Firm:
Kenji Yoshitake
Yukitaka Nakamura
Konno Akio
Noritaka Yokota
Masaharu Takamura
Yukitaka Nakamura
Konno Akio
Noritaka Yokota
Masaharu Takamura