# US 6,296,995 B1 · Digital photographic element with biaxially oriented polymer base

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- Number: US 6,296,995 B1
- Document ID: US6296995B1
- Status: Granted
- Kind: B1
- Application number: 09/480,896
- Filed: 2000-01-11
- Granted: 2001-10-02
- Earliest claimed: 2000-01-11
- Assignees: Eastman Kodak Company
- Inventors: Alphonse D. Camp; Peter T. Aylward; Robert P. Bourdelais
- Web page: https://patentgrep.com/patent/US6296995B1

## CPC

- G03C 1/775: the base being of paper
- G03C 7/3041: {Materials with specific sensitometric characteristics, e.g. gamma, density}
- G03C 1/08: Sensitivity-increasing substances
- G03C 1/09: Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising (G03C1/34, G03C1/35 take precedence)
- G03C 1/79: Macromolecular coatings or impregnations therefor, e.g. varnishes
- G03C 1/7954: {Polyesters}
- G03C 7/3029: {Materials characterised by a specific arrangement of layers, e.g. unit layers, or layers having a specific function}
- G03C 2001/093: {Iridium}
- G03C 2001/7628: {Back layer}
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)

## Abstract

The invention relates to A reflective base photographic element comprising a support material comprising a microvoided biaxially oriented polymer sheet having an upper surface L* of at least 93.5 and imaging layers wherein said imaging layers have an exposure range of between 125 to 0.5 when there is a Status A reflection density shoulder loss of no more than 8 percent as a function of the cyan record, wherein said photographic element has an exposure range of at least 125 nanoseconds to 0.5 seconds when there is a Status A reflection density shoulder loss of no more than 8 percent as a function of the magenta color record, wherein said photographic element has an exposure range of at least 125 nanoseconds to 0.5 seconds when there is a Status A reflection density shoulder loss of no more than 4 percent as a function of the yellow color record, and wherein said photographic element has a Status A reflection density minimum of less than 0.100 in the cyan layer, has a Status A reflection density minimum of less than 0.100 in the magenta layer, has a Status A reflection density minimum of less than 0.08 in the yellow layer, and a modulation transfer function (MTF) of at least 78.0, and a cyan Dmax of at least 2.53, a magenta Dmax of at least 2.34, and a yellow Dmax of at least 2.16.

## Claims

### Claim 1

A reflective base photographic element comprising a support material comprising a microvoided biaxially oriented polymer sheet having an upper surface L* of at least 94.2 and photosensitive silver halide containing imaging layers wherein said imaging layers have an exposure range of between 125 to 0.5 when there is a Status A reflection density shoulder loss of no more than 8 percent as a function of the cyan record, wherein said photographic element has an exposure range of at least 125 nanoseconds to 0.5 seconds when there is a Status A reflection density shoulder loss of no more than 8 percent as a function of the magenta color record, wherein said photographic element has an exposure range of at least 125 nanoseconds to 0.5 seconds when there is a Status A reflection density shoulder loss of no more than 4 percent as a function of the yellow color record, and wherein said photographic element has a Status A reflection density minimum of less than 0.100 in the cyan layer, has a Status A reflection density minimum of less than 0.100 in the magenta layer, has a Status A reflection density minimum of less than 0.08 in the yellow layer, and a modulation transfer function (MTF) of at least 78.0, and a cyan Dmax of at least 2.53, a magenta Dmax of at least 2.34, and a yellow Dmax of at least 2.16 wherein between the photosensitive layers and a microvoided layer of an upper microvoided sheet there is at least one layer of polypropylene comprising between 18 and 24% TiO2.

### Claim 2 (depends on 1)

The element of claim 1 wherein said element comprises a paper sheet below said biaxially oriented polymer sheet and a biaxially oriented polymer sheet on the side opposite said photosensitive imaging layers.

### Claim 3 (depends on 1)

The element of claim 1 wherein silver halide grains of the imaging layers of said full color photographic element are comprised of at least 90 percent silver chloride and further comprise an iridium coordination complex containing a thiazole or substituted thiazole ligand.

### Claim 4 (depends on 3)

The element of claim 3 further comprising a hexacoordination metal complex which satisfies the formula:
[ML6]n (I)
wherein
n is zero, −1, −2, −3 or −4;
M is a filled frontier orbital polyvalent metal ion, other than iridium; and
L6 represents bridging ligands which can be independently selected, provided that at least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand.

### Claim 5 (depends on 1)

The element of claim 1 wherein the biaxially oriented polymer sheet comprises a polyester sheet.

### Claim 6 (depends on 1)

The element of claim 1 wherein none of the silver halide containing layers contain greater than 0.25 mg/m2 silver.

### Claim 7 (depends on 1)

The element of claim 1 wherein the biaxially oriented polymer sheet comprises at least one layer comprising polyethylene.

### Claim 8 (depends on 1)

The element of claim 1 wherein said substrate has an L* greater than 95.0.

### Claim 9 (depends on 3)

A radiation-sensitive emulsion according to claim 3 wherein a class (i) dopant is located within the central portion of grains in an interior region surrounding at least 50 percent of the total silver forming the grains and is present in a concentration of from 10−8 to 10−3 mole per mole of silver, and a class (ii) dopant is located within the central portion of the grains in a sub-surface shell region surrounding at least 50 percent of the total silver forming the grains and is present in a concentration of from 10−9 to 10−4 mole per mole of silver.

### Claim 10 (depends on 1)

The element of claim 1 wherein the biaxially oriented polymer sheet comprises at least one layer comprising optical brightener.

### Claim 11 (depends on 1)

The element of claim 1 further comprising a paper base that has an apparent density of between 1.05 grams/cc and 1.21 grams/cc.

### Claim 12 (depends on 1)

The element of claim 1 wherein there is provided between said overlaying biaxially oriented polymer sheet and a base an adhesive layer comprising white pigments.

### Claim 13 (depends on 2)

The element of claim 2 wherein the opposite side biaxially oriented polymer sheet is provided with multicolor indicia on the upper side.

### Claim 14 (depends on 2)

The element of claim 2 wherein said paper base is provided with multicolor indicia on its lower surface.

### Claim 15 (depends on 1)

The element of claim 1 wherein said element comprises
wherein
Ra and Rb independently represent H or a substituent; X is hydrogen or a coupling-off group; and Za, Zb, and Zc are independently a substituted methine group, ═N—, ═C—, or —NH—, provided that one of either the Za—Zb bond or the Zb—Zc bond is a double bond and the other is a single bond, and when the Zb—Zc bond is a carbon-carbon double bond, it may form part of an aromatic ring, and at least one of Za, Zb, and Zc represents a methine group connected to the group Rb.

### Claim 16 (depends on 1)

The element of claim 1 wherein said element comprises
wherein
R′ and R″ are substituents selected such that the coupler is a “NB coupler”, as herein defined; and
Z is a hydrogen atom or a group which can be split off by the reaction of the coupler with an oxidized color developing agent.

### Claim 17 (depends on 1)

The element of claim 1 wherein said element comprises
wherein R2 represents a substituent, X is hydrogen or a coupling-off group; Y represents an aryl group or a heterocyclic group; and Q3 represents an organic residue required to form a nitrogen-containing heterocyclic group together with the >N—.