The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2000
Filed:
Oct. 09, 1998
Kenryo Namba, Tokyo, JP;
Sumiko Kitagawa, Saitama, JP;
Masahiro Shinkai, Chiba, JP;
Michio Suzuki, Hyogo, JP;
Satoshi Kimura, Hyogo, JP;
Kazuyoshi Hirako, Hyogo, JP;
TDK Corporation, Tokyo, JP;
Sumitomo Seika Chemicals Co., Ltd., Kako-gun, JP;
Abstract
The cyanine dyes of the invention are well soluble in solvents having a high evaporation rate and stable against light, and thus effective for improving productivity and realizing optical recording media, especially CD-R and DVD-R optical discs, having improved light resistance. The optical recording medium of the invention uses a photo-stabilized cyanine dye which is obtained as a counter ion bonded compound between an anion of the formula (1) and a cation of the formula (2): ##STR1## wherein R.sub.01 and R.sub.02 each are ##STR2## wherein each of R.sub.11 and R.sub.12 is an alkyl group of 1 to 4 carbon atoms or phenyl group, ##STR3## wherein m is equal to 3, 4, 5 or 6, ##STR4## or phenyl groups; M is a transition metal; each of Z.sub.1 and Z.sub.2 is a fused benzene ring or fused naphthalene ring; each of R.sub.21 and R.sub.22 is an alkyl group; and n is equal to 0, 1 or 2.