Optical recording medium

Details Optical recording medium Optical recording medium

1995-03-30

1996-10-29

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 648, 428913, 4302701, 43027011, 43027014, 4304951, 430945, 369288, B32B 300

Patent

active

055695043

ABSTRACT:
A phthalocyanine dye of specific structure represented by the following general formula (1) or (2): ##STR1## where Y is O or S attached to the phthalocyanine ring, Z is the group of atoms recurred to complete a carbon or heterocyclic ring together with C, A.sub.1 is a monovalent substituent bulkier than a hydrogen atom, and each of X.sub.1 and X.sub.2 is H or a monovalent substituent or, in the alternative, X.sub.1 and X.sub.2, taken together, form a single bond, ##STR2## where Y and Z.sub.1 have the same meanings as defined for Y and Z in formula (1), All is a monovalent substituent having a branched alkyl group, which is attached to the ring completed by Z.sub.1, and s1 is the number of A.sub.11, is used for the recording layer of an optical recording layer. This phthalocyanine dye is unlikely to attack a substrate material such as PC, can be handled with ease, and has a high solubility in a coating solvent advantageous for film formation, for instance, an alcoholic solvent, e.g., ethyl cellosolve or an aliphatic hydrocarbon solvent.

REFERENCES:
patent: 5248538 (1993-09-01), Kovacs
patent: 5348840 (1994-09-01), Sakamoto
patent: 5449587 (1995-09-01), Itoh
Nikkei Electronics; 23 Jan. 1989 (No. 465).
The Functional Dye Department of the Kinki Chemical Society; Mar. 3, 1989.
SPIE vol. 1078; Optical Recording Topical Meeting (1989).

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