| 摘要 |
<P>PROBLEM TO BE SOLVED: To develop an optical data recording medium excellent in hydrothermal resistance. <P>SOLUTION: The optical data recording medium uses at least one kind of a compound represented by formula (1) (wherein, R<SB>1</SB>-R<SB>8</SB>may be same or different and are each a substituent and at least one of R<SB>1</SB>-R<SB>8</SB>is a branched chain alkyl group, rings A and B may each have a substituent and X is an anion necessary for neutralizing charge) and/or a compound represented by formula (2) [wherein, R<SB>1</SB>-R<SB>8</SB>, rings A and B and X are same to those of the formula (1)]. <P>COPYRIGHT: (C)2003,JPO |
