Radiographic elements exhibiting increased speed and covering power
AssigneeEastman Kodak Company
InventorsAnthony Adin, Jerome J. Looker
Life of this patent
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Abstract
A radiographic element is disclosed containing in a high bromide tabular grain emulsion layer a 5-mercaptotetrazole to increase covering power. The 5-mercaptotetrazole is additionally capable of increasing imaging speed and producing colder image tones when provided with a phenyl substituent in the 1 ring position, which phenyl substituent is in turn substituted in its para position with a substituent satisfying the formula R(OCH.sub.2 CH.sub.2).sub.n O-- wherein n is an integer of from zero to 5; when n is 1 to 5, R is hydrogen, methyl or ethyl; and, when n is zero, R is methyl.
Claims10
A radiographic element comprised of a support and, coated on the support, an emulsion comprised of
- a hydrophilic colloid and
- radiation-sensitive silver halide grains containing greater than 50 mole percent bromide and less than 3 mole percent iodide, based on silver,
- greater than 50 percent of the total projected area of the silver halide grains being accounted for by tabular grains having a thickness of less than 0.3 .mu.m, and,
- in an amount sufficient to increase covering power, a 5-mercaptotetrazole,
- WHEREIN the 5-mercaptotetrazole is a 1-(4-M-phenyl)-5-mercaptotetrazole in which M satisfies the formula:
- R(OCH.sub.2 CH.sub.2).sub.n O--
- wherein
- n is an integer of from zero to 5;
- when n is 1 to 5, R is hydrogen, methyl or ethyl;
- and,
- when n is zero, R is methyl.
Dependencies are inferred from the claim text.