US4266016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic layer for silver halide photographic materials
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1979-08-27
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Granted: 1981-05-05
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Expires: 1999-08-27
Abstract
Abstract Silver halide photographic materials having excellent antistatic property and high acceptability for drafting, processing resistance and adhesion to hydrophobic supports can be obtained by providing antistatic layer which comprises (a) a styrene-maleic anhydride copolymer, (b) colloidal silica and (c) at least one compound selected from the group consisting of compounds having at least 2 ethyleneimino groups and compounds having at least 2 epoxy rings and which has a pH value of at least about 5, said antistatic layer being provided on one or both surfaces of the support.
Inventors
- 👤 Sukeaki Date
- 👤 Seigo Ebato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:53
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
95 words
In a silver halide photographic material which comprises a support having hydrophobic surface and at least one silver halide emulsion layer thereon, the improvement comprising an antistatic layer which comprises (a) a styrene-maleic anhydride copolymer, (b) colloidal silica and (c) at least one compound selected from the group consisting of compounds having at least 2 ethyleneimino groups in a molecule and compounds having at least 2 epoxy rings in a molecule and which has a pH value of at least about 5, said antistatic layer being provided on one or both surfaces of the support.
Claim 2
Dependent Claim
95 words
In a silver halide photographic material which comprises a support having hydrophobic surface and at least one silver halide emulsion layer thereon, the improvement comprising an antistatic layer which comprises (a) a styrene-maleic anhydride copolymer, (b) colloidal silica and (c) at least one compound selected from the group consisting of compounds having at least 2 ethyleneimino groups in a molecule and compounds having at least 2 epoxy rings in a molecule and which has a pH value of at least about 5, said antistatic layer being provided on one or both surfaces of the support.
Claim 3
Dependent Claim
16 words
A silver halide photographic material according to claim 1, wherein the support has polyolefin resin surface.
Claim 4
Dependent Claim
14 words
A silver halide photographic material according to claim 2, wherein the polyolefin is polypropylene.
Claim 5
Dependent Claim
26 words
A silver halide photographic material according to claim 1, wherein the antistatic layer is provided on the side opposite to the surface having the emulsion layer.
Claim 6
Dependent Claim
22 words
A silver halide photographic material according to claim 4, wherein dry solids weight of the antistatic layer is 0.5-5 g/m 2 .
Claim 7
Dependent Claim
35 words
A silver halide photographic material according to claim 5, the dry solids weight of the antistatic layer is smaller than the total dry solids weight of layers on the surface having silver halide emulsion layer.
Claim 8
Dependent Claim
37 words
A silver halide photographic material according to claim 1, wherein the component (c) is combination of compound having at least 2 ethyleneimino groups in a molecule and compound having at least 2 epoxy rings in a molecule.
Claim 9
Dependent Claim
68 words
A silver halide photographic material according to claim 1 or 4, wherein an intermediate layer mainly composed of water-soluble polymer substantially other than styrene-maleic anhydride copolymer and having a pH of not higher than about 5 is provided between the support and the antistatic layer comprising components (a), (b) and (c) of claim 1, pH value of said intermediate layer being lower than that of the upper layer.
Claim 10
Dependent Claim
21 words
A silver halide photographic material according to claim 8, wherein the intermediate layer is mainly composed of gelatin or gelatin derivatives.
Claim 11
Dependent Claim
27 words
A silver halide photographic material according to claim 8, wherein the difference in pH value of the upper layer and the intermediate layer is at least 0.5.
Claim 12
Dependent Claim
16 words
A silver halide photographic material according to 8, wherein the intermediate layer contains polyvalent metal compound.
Claim 13
Dependent Claim
16 words
A silver halide photographic material according to 8, wherein the intermediate layer contains polyvalent metal compound.
Claim 14
Dependent Claim
23 words
A silver halide photographic material according to claim 8, where the intermediate layer contains a particulate material having a particle size of 0.5-5μ.
Claim 15
Dependent Claim
76 words
A silver halide photographic material according to claim 1 wherein the amount of styrene maleic anhydride copolymer is about 20 to about 90% by weight of the dry solids of the antistatic layer, the colloidal silica is about 10 to about 80% by weight of the antistatic layer and the compound having the ethyleneimino groups or the epoxy groups is about 0.05 to 2 parts by weight per 10 parts by weight of styrene-maleic anhydride copolymer.
Claim 16
Dependent Claim
75 words
A silver halide photographic material according to claim 13 wherein the amount of styrene-maleic anhydride copolymer is about 20 to about 90% by weight of the dry solids of the antistatic layer, the colloidal silica is about 10 to about 80% by weight of the antistatic layer and the compound having the ethyleneimino groups or the epoxy groups is about 0.05 to 2 parts by weight per 10 parts by weight of styrene-maleic anhydride copolymer.
Claim 17
Dependent Claim
33 words
A silver halide photographic material according to claim 13 wherein the antistatic layer consists of the styrene-maleic anhydride copolymer, colloidal silica, compound having the ethyleneimino groups or epoxy groups and an anionic surfactant.
Claim 18
Dependent Claim
33 words
A silver halide photographic material according to claim 1 wherein the antistatic layer consists of the styrene-maleic anhydride copolymer, collodial silica, compound having the ethyleneimino groups or epoxy groups and an anionic surfactant.
Claim 19
Dependent Claim
32 words
A silver halide photographic material according to claim 1 wherein the antistatic layer consists essentially of the sytrene-maleic anhydride copolymer, colloidal silica and the compound having the ehyleneimino groups or epoxy groups.
Claim 20
Dependent Claim
17 words
A silver halide photographic material according to claim 1 wherein the antistatic layer is free of gelatin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |