| 摘要 |
A photographic laser recording material is disclosed comprising a transparent base and at least one emulsion layer containing a silver halide emulsion which is sensitized to the near infra-red by the combination of a heptamethine chain containing dye according to general formula (I) and a supersensitizer characterized in that said emulsion layer further contains a compound according to general formula (II) : <CHEM> wherein, Z<1> and Z<2> represent a non metallic atomic group necessary to complete a benzothiazole, benzoxazole, naphtothiazole or naphtoxazole nucleus; R 5 and R6 each represent an alkyl or substituted alkyl group; R1, R2, R3, and R4 each represent a hydrogen atom, a substituted or unsubstituted alkyl, alkoxy, amino, phenyl or benzyl group; R 1 and R3, or R2 and R4 repectively may combine with each other to form a substituted or unsubstituted 5- or 6-membered ring; X<->n is an anion of the type commonly present in sensitizing dyes, e.g. bromide, chloride, iodide, methyl sulphate, p-tolyl sulphate; n is 0 or 1 (0 in case of an intramolecular salt via an anionic group in R ). <CHEM> wherein R11, R13, and R14 each represent a hydrogen atom or a substituted or unsubstituted lower alkyl group and R12 represents a substituted or unsubstituted alkyl or aryl group; the optionally substituted amino group is situated on the 6th or 7th position of the quinolone nucleus. By the addition of a compound according to general formula (II) an important speed increase in infra-red sensitized materials is achieved. Preferably the infra-red sensitized material is a laser recording material which provides a hard copy of radiographic information.
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