US5008178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet or web carrying an antistatic layer
Assignee: Agfa Gevaert NV
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Filing: 1989-02-02
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Granted: 1991-04-16
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Expires: 2009-02-02
Abstract
Abstract A sheet or web material being a subbed or unsubbed hydrophobic resin support or paper support coated with at least one hydrophobic resin layer having at least on one side an outermost antistatic layer containing colloidal silica, characterized in that the antistatic layer is free from any cationic surfactant and consists of at least 70% of weight of colloidal silica having an average particle size smaller thatn 7 nm and a surface area of at least 500 m2 per gram, the colloidal silica being present at a coverage of at least 50 mg per m2.
Inventors
- 👤 Etienne A. Van Thillo
- 👤 Lucien J. Van Gossum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:50
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/95; G03C1/005; G03C1/06; G03C1/32; G03C1/85; G03C1/853; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/27; Y10T428/273; Y10T428/31504; Y10T428/31786; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
A sheet or web material being a subbed or unsubbed hydrophobic resin support or paper support coated with at least one hydrophobic resin layer having at least on one side an outermost antistatic layer containing colloidal silica, wherein the antistatic layer is free from any cationic surfactant and consists for at least 70% by weight of colloidal silica having an average grain size smaller than 7 nm and a surface area of at least 500 m2 per gram, the colloidal silica being present at a coverage of at least 50 mg per m2.
Claim 2
Dependent Claim
93 words
A sheet or web material being a subbed or unsubbed hydrophobic resin support or paper support coated with at least one hydrophobic resin layer having at least on one side an outermost antistatic layer containing colloidal silica, wherein the antistatic layer is free from any cationic surfactant and consists for at least 70% by weight of colloidal silica having an average grain size smaller than 7 nm and a surface area of at least 500 m2 per gram, the colloidal silica being present at a coverage of at least 50 mg per m2.
Claim 3
Dependent Claim
20 words
A sheet or web material according to claim 1, wherein said antistatic layer is free from organic hydrophilic colloid binder.
Claim 4
Dependent Claim
28 words
A sheet or web material according to claim 1, wherein the coverage of said colloidal silica is in the range of 100 mg to 500 mg per m2.
Claim 5
Dependent Claim
31 words
A sheet or web material according to claim 1, wherein said antistatic layer is coated from an aqueous dispersion of the colloidal silica in the presence of a non-ionic wetting agent.
Claim 6
Dependent Claim
17 words
A sheet or web material according to claim 1, wherein said support is a polyester resin support.
Claim 7
Dependent Claim
34 words
A sheet or web material according to claim 1, wherein said material is a photographic material containing (a) silver halide emulsion layer(s) on a subbed hydrophobic resin support or hydrophobic resin coated paper support.
Claim 8
Dependent Claim
32 words
A sheet or web material according to claim 6, wherein the antistatic layer is present at the side of the hydrophobic resin support opposite with respect to the silver halide emulsion layer(s).
Claim 9
Dependent Claim
17 words
A sheet or web material according to claim 1, wherein said antistatic layer contains friction lowering substances.
References Cited (Backward Citations)
US3525621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |