US4149891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion transfer photographic materials comprising polyvinyl ether neutralizing layer
Assignee: Konica Minolta Inc
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Filing: 1977-06-22
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Granted: 1979-04-17
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Expires: 1997-06-22
Abstract
Abstract An improved neutralization layer is disclosed for a diffusion transfer photographic material wherein said layer contains a copolymer having a monomer unit represented by the formula ##STR1## wherein A is a divalent radical selected from the group consisting of an alkylene group, an arylene group and a combination group consisting of at least one alkylene group and at least one arylene group; the alkylene group containing two or more carbon atoms; the alkylene group, the arylene group and the combination group containing at least one --COOR and/or at least one ##STR2## in which R is hydrogen or an alkyl group.
Inventors
- 👤 Yuzuru Sato
- 👤 Masao Asano
- 👤 Michitoshi Iwao
- 👤 Mikio Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:05
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
122 words
In a diffusion transfer photographic material having a support and thereon a neutralization layer for lowering a pH value increased by application of an alkaline processing composition, the improvement which comprises the neutralization layer comprising a copolymer containing, as a monomer unit, a monomer of the general formula: ##STR86## wherein A is a divalent radical selected from the group consisting of an alkylene group, an arylene group and a combination group consisting of at least one alkylene group and at least one arylene group; the alkylene group containing two or more carbon atoms; the alkylene group, the arylene group and the combination group containing at least one --COOR and/or at least one ##STR87## in which R is hydrogen or an alkyl group.
Claim 2
Dependent Claim
122 words
In a diffusion transfer photographic material having a support and thereon a neutralization layer for lowering a pH value increased by application of an alkaline processing composition, the improvement which comprises the neutralization layer comprising a copolymer containing, as a monomer unit, a monomer of the general formula: ##STR86## wherein A is a divalent radical selected from the group consisting of an alkylene group, an arylene group and a combination group consisting of at least one alkylene group and at least one arylene group; the alkylene group containing two or more carbon atoms; the alkylene group, the arylene group and the combination group containing at least one --COOR and/or at least one ##STR87## in which R is hydrogen or an alkyl group.
Claim 3
Dependent Claim
19 words
A diffusion transfer photographic material as claimed in claim 1 wherein the alkyl group for R is unsubstituted alkyl.
Claim 4
Dependent Claim
26 words
A diffusion transfer photographic material as claimed in claim 1 wherein the alkylene group, the arylene group or the combination group for A contains one -COOR.
Claim 5
Dependent Claim
26 words
A diffusion transfer photographic material as claimed in claim 1 wherein the alkylene group for A is an alkylene group having 2 to 8 carbon atoms.
Claim 6
Dependent Claim
23 words
A diffusion transfer photographic material as claimed in claim 1 wherein the alkyl group for R is of 1 to 8 carbon atoms.
Claim 7
Dependent Claim
28 words
A diffusion transfer photographic material as claimed in claim 1 wherein the at least one alkylene group for the combination group is of 1 to 4 carbon atoms.
Claim 8
Dependent Claim
27 words
A diffusion transfer photographic material as claimed in claim 1 wherein the copolymer contains the monomer in an amount of 10% or more in the molar proportion.
Claim 9
Dependent Claim
33 words
A diffusion transfer photographic material as claimed in claim 1 wherein the amount of the copolymer in the photographic material is 0.1 - 0.3 g per 100 cm 2 of the photographic material
Claim 10
Dependent Claim
50 words
A diffusion transfer photographic material as claimed in claim 1 wherein the photographic material comprises a transparent support, a receiving layer, a light-sensitive silver halide emulsion layer and a transparent cover sheet in this order, the photographic material comprising the neutralization layer between the emulsion layer and the cover sheet.
Claim 11
Dependent Claim
27 words
A diffusion transfer photographic material as claimed in claim 9 wherein the photographic material further comprises a timing layer between the neutralization layer and the emulsion layer.
Claim 12
Dependent Claim
48 words
A diffusion transfer photographic material as claimed in claim 1 wherein the photographic material comprises, in turn, a transparent support, a receiving layer, a light-sensitive silver halide emulsion layer and a transparent cover sheet, the photographic material comprising the neutralization layer between the support and the receiving layer.
Claim 13
Dependent Claim
27 words
A diffusion transfer photographic material as claimed in claim 11 wherein the photographic material further comprises a timing layer between the neutralization layer and the receiving layer.
References Cited (Backward Citations)
US2373782A
Cited
US3880658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |