US3751249A
Expired / Lapsed
US
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Photothermic silver halide element containing a bis-beta-naphthol reducing agent and a 1, 3-dihydroxy-benzene reducing agent
Assignee: Eastman Kodak Co
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Filing: 1971-03-15
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Granted: 1973-08-07
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Expires: 1991-03-15
Abstract
Abstract In photosensitive materials for processing with heat, a combination of a bis-beta-naphthol reducing agent with a 1,3dihydroxybenzene reducing agent, such as 2,4dihydroxybenzaldehyde or 2,4-dihydroxybenzophenone, provides surprisingly increased relative speed, maximum density and exposure latitude. This combination of reducing agents can be used in photosensitive and thermosensitive materials for processing with heat. These materials can contain addenda commonly employed in photosensitive materials such as activatortoning agents, stabilizers or stabilizer precursors, sensitizing dyes and the like.
Inventors
- 👤 G Hiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:18
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49827; G03C2200/00; G03C2200/42
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
36 words
A photothermographic element as in claim 1 comprising a support having thereon a. photosensitive silver halide, b. an oxidation-reduction image forming combination comprising i. silver behenate with ii. 2,2''-dihydroxy-1,1''-binaphthyl, and c. 2,4-dihydroxybenzaldehyde, 2,4-dihydroxybenzophenone, or 2'', 4''-dihydroxyacetophenone.
Claim 2
Dependent Claim
12 words
A photothermographic element as in claim 1 also comprising an activator-toning agent.
Claim 3
Dependent Claim
12 words
A photothermographic element as in claim 1 also comprising phthalimide or phthalazinone.
Claim 4
Dependent Claim
12 words
A photothermographic element as in claim 1 also comprising a stabilizer precursor.
Claim 5
Dependent Claim
10 words
A photothermographic element as in claim 1 also comprising 5-acetyl-2-benzyloxycarbonylthio-4-methylthiazole.
Claim 6
Dependent Claim
12 words
A photothermographic element as in claim 1 also comprising a sensitizing dye.
Claim 7
Dependent Claim
11 words
A photothermographic element as in claim 1 also comprising 3-carboxymethyl-5-((3-methyl-2(3H)-thiazolinylidene)isopropylidene) rhodanine.
Claim 8
Dependent Claim
62 words
A photothermographic element as in claim 1 comprising 0.01 to 0.50 moles of said photosensitive silver halide per mole of said heavy metal salt oxidizing agent; 0.4 to 2.0 moles of said bis-beta-naphthol reducing agent per mole of said heavy metal salt oxidizing agent; and wherein the ratio of said bis-beta-naphthol reducing agent to said 1,3-dihydroxybenzene compound is from 10:1 to 1:5.
Claim 9
Dependent Claim
30 words
A photothermographic element comprising a support having thereon a. photosensitive silver halide, b. silver behenate, c. 2,2''-dihydroxy-1,1''-binaphthyl, d. 2,4-dihydroxybenzaldehyde, 2,4-dihydroxybenzophenone or 2,4-dihydroxyacetophenone, e. phthalimide, f. 5-acetyl-2-benzyloxycarbonylthio-4-methyl-thiazole, and g. 3-carboxymethyl-5-((3-methyl-2(3H) -thiazolinylidene)isopropylidene)rhodanine.
Claim 10
Dependent Claim
37 words
A photothermographic composition comprising a. photosensitive silver halide, with b. an oxidation-reduction image forming combination comprising i. a heavy metal salt oxidizing agent with ii. a bis-beta-naphthol reducing agent, and c. a 1,3-dihydroxybenzene compound of the formula:
Claim 11
Dependent Claim
32 words
A photothermographic composition as in claim 11 comprising a. photosensitive silver halide b. an oxidation-reduction image forming combination comprising i. silver behenate with ii. 2,2''-dihydroxy-1,1''-binaphthyl, and c. 2,4-dihydroxybenzaldehyde, 2,4-dihydroxybenzophenone, or 2'', 4''-dihydroxyacetophenone.
Claim 12
Dependent Claim
12 words
A photothermographic composition as in claim 11 also comprising an activator-toning agent.
Claim 13
Dependent Claim
12 words
A photothermographic element as in claim 11 also comprising phthalimide or phthalazinone.
Claim 14
Dependent Claim
12 words
A photothermographic composition as in claim 11 also comprising a stabilizer precursor.
Claim 15
Dependent Claim
10 words
A photothermographic composition as in claim 11 also comprising 5-acetyl-2-benzyloxycarbonylthio-4-methylthiazole.
Claim 16
Dependent Claim
12 words
A photothermographic composition as in claim 11 also comprising a sensitizing dye.
Claim 17
Dependent Claim
11 words
A photothermographic composition as in claim 11 also comprising 3-carboxymethyl-5-((3-methyl-2(3H)-thiazolinylidene)isopropyl -idene)rhodanine.
Claim 18
Dependent Claim
61 words
A photothermographic composition as in claim 11 comprising 0.01 to 0.50 moles of said photosensitive silver halide per mole of said heavy salt oxidizing agent; 0.4 to 2.0 moles of said bis-beta-naphthol reducing agent per mole of said heavy metal salt oxidizing agent; and wherein the ratio of said bis-beta-naphthol reducing agent to said 1,3-dihydroxybenzene compound is from 10:1 to 1:5.
Claim 19
Dependent Claim
27 words
A photothermographic composition comprisng a. photosensitive silver halide, b. silver behenate, c. 2,2''-dihydroxy-1,1''-binaphthyl, d. 2,4-dihydroxybenzyaldehyde, 2,4-dihydroxybenzophenone, or 2, 4-dihydroxyacetophenone, e. phthalimide, f. 5-acetyl-2-benzyloxycarbonylthio-4-methyl-thiazole, and g. 3-carboxymethyl-5-((3-methyl-2(3H) -thiazolinylidene)isopropylidene)rhodanine.
Claim 20
Dependent Claim
50 words
A process of developing a latent image in an exposed photothermographic element comprising a support having thereon a. photosensitive silver halide, b. an oxidation-reduction image forming combination comprising i. a heavy metal salt oxidizing agent with ii. a bis-beta-naphthol reducing agent, and c. a 1,3-dihydroxybenzene compound represented by the formula:
Claim 21
Dependent Claim
23 words
The process of claim 28 wherein said element is heated to aboUt 80*C. to about 250*C. for about 0.5 to about 60 seconds.
Claim 22
Dependent Claim
51 words
A process of developing and stabilizing a latent image in an exposed photothermographic element comprising a support having thereon a. photosensitive silver halide, b. silver behenate, c. 2,2''-dihydroxy-1,1''-binaphthyl, d. 2,4-dihydroxybenzaldehyde, 2,4-dihydroxybenzo-phenone or 2,4-dihydroxyacetophenone, e. phthalimide, f. 5-acetyl-2-benzyloxycarbonylthio-4-methylthiazole, and g. 3-carboxymethyl-5-((3-methyl-2(3H) -thiazolinylidene)isopropylidene)rhodanine, comprising heating said element to about 80*C. to about 250*C.
Claim 23
Dependent Claim
23 words
The process of claim 30 wherein said element is heated at about 120*C. to about 180*C. for about 0.5 to about 5 seconds.
References Cited (Backward Citations)
GB1178800A
Cited
US3667958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |