US5232818A — Nucleated high contrast photographic elements con…

Claim 1

Independent Claim 113 words

A silver halide photographic element adapted to form a high contrast image when developed with an aqueous alkaline developing solution; said element comprising: (1) at least one silver halide emulsion layer, (2) a hydrazine compound that functions as a nucleator, (3) an amino compound that functions as an incorporated booster, and (4) a thioether compound that functions as a pepper fog inhibitor and image spread restrainer, said thioether compound being free of both hydrazino and amino functionality, and (a) containing within its structure at least one thio group, (b) containing within its structure a group comprised of at least three repeating ethyleneoxy units, and (c) having a partition coefficient of at least one.

Claim 2

Dependent Claim 113 words

A silver halide photographic element adapted to form a high contrast image when developed with an aqueous alkaline developing solution; said element comprising: (1) at least one silver halide emulsion layer, (2) a hydrazine compound that functions as a nucleator, (3) an amino compound that functions as an incorporated booster, and (4) a thioether compound that functions as a pepper fog inhibitor and image spread restrainer, said thioether compound being free of both hydrazino and amino functionality, and (a) containing within its structure at least one thio group, (b) containing within its structure a group comprised of at least three repeating ethyleneoxy units, and (c) having a partition coefficient of at least one.

Claim 3

Dependent Claim 57 words

A silver halide photographic element as claimed in claim 1 wherein said hydrazine compound is an aryl sulfonamidophenyl hydrazide of the formula: ##STR20## where R is a monovalent group comprised of at least three repeating ethyleneoxy units, m is 1 to 6, Y is a divalent aromatic radical, and R 1 is hydrogen or a blocking group.

Claim 4

Dependent Claim 53 words

A silver halide photographic element as claimed in claim 1 wherein said amino compound is a compound which (1) comprises at least one secondary or tertiary amino group, (2) contains within its structure a group comprised of at least three repeating ethyleneoxy units, and (3) has a partition coefficient of at least one.

Claim 5

Dependent Claim 80 words

A silver halide photographic element as claimed in claim 1 wherein said amino compound is a bis-tertiary amine of the formula: ##STR21## wherein n is an integer with a value of 3 to 50 , R 1 , R 2 , R 3 and R 4 are independently alkyl groups of 1 to 8 carbon atoms, R 1 and R 2 taken together and R 3 and R 4 taken together represent the atoms necessary to complete a heterocyclic ring.

Claim 6

Dependent Claim 54 words

A silver halide photographic element as claimed in claim 1 wherein said amino compound is a bis-secondary amine of the formula: ##STR22## wherein n is an integer with a value of 3 to 50 and each R is independently a linear or branched, substituted or unsubstituted alkyl group of at least 4 carbon atoms.

Claim 7

Dependent Claim 51 words

A silver halide photographic element as claimed in claim 1 wherein said thioether compound is represented by the formula: R--S--(CH.sub.2 CH.sub.2 O).sub.n --R' wherein R and R' are monovalent organic radicals which can be the same or different and n is an integer with a value of from 3 to 50.

Claim 8

Dependent Claim 56 words

A silver halide photographic element as claimed in claim 1 wherein said thioether compound is represented by the formula: R--S--(CH.sub.2 CH.sub.2 O).sub.n --R' wherein R and R' are alkyl, cycloalkyl, aryl, alkaryl, aralkyl or heterocyclic groups which can be the same or different and n is an integer with a value of from 3 to 50.

Claim 9

Dependent Claim 61 words

A silver halide photographic element as claimed in claim 1 wherein said thioether compound is a dithio ether represented by the formula: R--S--(CH.sub.2 CH.sub.2 O).sub.n --CH.sub.2 CH.sub.2 --S--R' wherein R and R' are alkyl, cycloalkyl, aryl, alkaryl, aralkyl or heterocyclic groups which can be the same or different and n is an integer with a value of from 3 to 50.

Claim 10

Dependent Claim 61 words

A silver halide photographic element as claimed in claim 1 wherein said thioether compound is a symmetrical dithio ether represented by the formula: R--S--(CH.sub.2 CH.sub.2 O).sub.n --R' wherein R is an alkyl, cycloalkyl, aryl, alkaryl, aralkyl or heterocyclic group, R' is a --CH 2 CH 2 --S--R group, and n is an integer with a value of from 3 to 50.

Claim 11

Dependent Claim 22 words

A silver halide photographic element as claimed in claim 1 wherein said thioether compound has a partition coefficient of at least three.

Claim 12

Dependent Claim 22 words

A silver halide photographic element as claimed in claim 1 wherein said thioether compound has a partition coefficient of at least four.

Claim 13

Dependent Claim 18 words

A silver halide photographic element as claimed in claim 1 wherein said thioether compound has the formula: ##STR23##

Claim 14

Dependent Claim 18 words

A silver halide photographic element as claimed in claim 1 wherein said thioether compound has the formula: ##STR24##

Claim 15

Dependent Claim 18 words

A silver halide photographic element as claimed in claim 1 wherein said thioether compound has the formula: ##STR25##

Claim 16

Dependent Claim 72 words

A silver halide photographic element as claimed in claim 1 wherein said hydrazine compound is present in an amount of from about 0.1 to about 10 millimoles per mole of silver, said amino compound is present in an amount of from about 1 to about 25 millimoles per mole of silver, and said thioether compound is present in an amount of from about 0.2 to about 5 millimoles per mole of silver.

Claim 17

Dependent Claim 25 words

A silver halide photographic element as claimed in claim 1 wherein said silver halide has a mean grain, size of about 0.4 microns or less.

Claim 18

Dependent Claim 20 words

A silver halide photographic element as claimed in claim 1 wherein said silver halide is silver bromide or silver bromoiodide.

Claim 19

Dependent Claim 22 words

A silver halide photographic element as claimed in claim 1 wherein said silver halide is silver chloride, silver chlorobromide or silver chlorobromoiodide.

Claim 20

Dependent Claim 91 words

A silver halide photographic element adapted to form a high contrast image when developed with an aqueous alkaline developing solution, said element comprising: (1) at least one silver halide emulsion layer, (2) a hydrazine compound that functions as a nucleator, said hydrazine compound having the formula: ##STR26## (3) an amino compound that functions as an incorporated booster, said amino compound having the formula: ##STR27## where Pr represents n-propyl, and (4) a thioether compound that functions as a pepper fog inhibitor and image spread restrainer, said thioether compound having the formula: ##STR28##

Claim 21

Dependent Claim 91 words

A silver halide photographic element adapted to form a high contrast image when developed with an aqueous alkaline developing solution, said element comprising: (1) at least one silver halide emulsion layer, (2) a hydrazine compound that functions as a nucleator, said hydrazine compound having the formula: ##STR26## (3) an amino compound that functions as an incorporated booster, said amino compound having the formula: ##STR27## where Pr represents n-propyl, and (4) a thioether compound that functions as a pepper fog inhibitor and image spread restrainer, said thioether compound having the formula: ##STR28##

Claim 22

Dependent Claim 91 words

A silver halide photographic element adapted to form a high contrast image when developed with an aqueous alkaline developing solution, said element comprising: (1) at least one silver halide emulsion layer, (2) a hydrazine compound that functions as a nucleator, said hydrazine compound having the formula: ##STR29## (3) an amino compound that functions as an incorporated booster, said amino compound having the formula: ##STR30## where Pr represents n-propyl, and (4) a thioether compound that functions as a pepper fog inhibitor and image spread restrainer, said thioether compound having the formula: ##STR31##

Claim 23

Dependent Claim 91 words

A silver halide photographic element adapted to form a high contrast image when developed with an aqueous alkaline developing solution, said element comprising: (1) at least one silver halide emulsion layer, (2) a hydrazine compound that functions as a nucleator, said hydrazine compound having the formula: ##STR29## (3) an amino compound that functions as an incorporated booster, said amino compound having the formula: ##STR30## where Pr represents n-propyl, and (4) a thioether compound that functions as a pepper fog inhibitor and image spread restrainer, said thioether compound having the formula: ##STR31##

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-08-02	1997-02-01	1997-08-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-08-02	2001-02-01	2001-08-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-08-02	2005-02-01	2005-08-03	$7700.00	Window Closed / Lapsed

Nucleated high contrast photographic elements containing thioether compounds to inhibit pepper fog and restrain image spread

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