US4895792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic light-sensitive Silver halide element with antistatic backing layer
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1988-11-18
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Granted: 1990-01-23
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Expires: 2008-11-18
Abstract
Abstract Photographic light-sensitive materials having a coating layer containing a cation modified colloidal silica on one surface of a hydrophobic support have markedly improved antistatic properties.
Inventors
- 👤 Yasuhiro Aizawa
- 👤 Touru Noda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:34
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/853; G03C1/95
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A photographic light-sensitive element having improved antistatic properties consisting essentially of a hydrophobic support, a photographic light-sensitive silver halide emulsion layer on one side of the support, and an antistatic layer on the other side of the support, wherein the antistatic layer comprises a binder and a cation modified colloidal silica having an average particle diameter of 7-30 millimicrons, the surface of the colloidal silica being coated with a cation modifier chosen from finely divided hydrous metallic oxide selected from aluminum, zirconium, and tin in an amount of 0.5%-30% weight in terms of metal oxide based on the weight of the colloidal silica, and further wherein the coating amount (solid content) of cation modified colloidal silica applied to the support to form the antistatic layer is 30-200 mg/m 2 .
Claim 2
Dependent Claim
130 words
A photographic light-sensitive element having improved antistatic properties consisting essentially of a hydrophobic support, a photographic light-sensitive silver halide emulsion layer on one side of the support, and an antistatic layer on the other side of the support, wherein the antistatic layer comprises a binder and a cation modified colloidal silica having an average particle diameter of 7-30 millimicrons, the surface of the colloidal silica being coated with a cation modifier chosen from finely divided hydrous metallic oxide selected from aluminum, zirconium, and tin in an amount of 0.5%-30% weight in terms of metal oxide based on the weight of the colloidal silica, and further wherein the coating amount (solid content) of cation modified colloidal silica applied to the support to form the antistatic layer is 30-200 mg/m 2 .
Claim 3
Dependent Claim
26 words
A photographic light-sensitive element according to claim 1, wherein the coating layer contains a surfactant which does not form agglomerate with the cation modified colloidal silica.
Claim 4
Dependent Claim
22 words
A photographic light-sensitive element according to claim 1, wherein the coating layer contains an alkali metal salt of a styrene-maleic anhydride copolymer.
Claim 5
Dependent Claim
32 words
A photographic light-sensitive element according to claim 3, wherein the content of the alkali metal salt of styrene-maleic anhydride copolymer is 10-100% by weight (solid content) of the cation modified colloidal silica.
Claim 6
Dependent Claim
34 words
A photographic light-sensitive element according to claim 1, wherein the covering amount of the cation modifier for silica (in terms of SiO 2 ) is 5-20% by weight in terms of its metal oxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |