Information recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorKoji Wariishi
Life of this patent
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Abstract
An information recording medium having a high light-resistance has a recording layer containing an organic dye and a quaternary ammonium salt having the following formula (I): M.sup.n+.n/m X.sup.m- (I) in which M.sup.n+ represents a quaternary ammonium ion, X.sup.m- represents an anion, n represents an integer of 2 or more, and m represents an integer of 1 or more.
Claims7
An information recording medium comprising a support and a recording layer provided thereon, wherein said recording layer comprises an organic dye and a quaternary ammonium salt having the following formula (I):
- M.sup.n+.n/m X.sup.m- (I)
- in which M.sup.n+ represents a divalent cation of 2,2'-bipyridyl, 4,4'-bipyridyl or phenanthroline which has on each of its nitrogen atoms a substituent group selected from the group consisting of alkyl, alkenyl, alkynyl and aryl, X.sup.m- represents an anion, n represents an integer of not less than 2, and m represents an integer of not less than 1.
A method for preventing an organic dye from fading which comprises mixing the organic dye with a quaternary ammonium salt having the following formula (I):
- M.sup.n+.n/m X.sup.m- (I)
- in which M.sup.n+ represents a divalent cation of 2,2'-bipyridyl, 4,4'-bipyridyl or phenanthroline which has on each of its nitrogen atoms a substituent group selected from the group consisting of alkyl, alkenyl, alkynyl and aryl, X.sup.m- represents an anion, n represents an integer of not less than 2, and m represents an integer of not less than 1.
Dependencies are inferred from the claim text.