EP0334400A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A sheet or web carrying an antistatic layer
Assignee: Agfa Gevaert NV
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Filing: 1989-01-30
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Granted: —
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Expires: 2009-01-30
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, characterised in that the antistatic layer is free from any cationic surfactant and consists for at least 70 % by weight of colloidal silica having an average particle size not larger than 10 nm and a surface area of at least 300 m2 per gram, the colloidal silica being present at a coverage of at least 50 mg per m2.
Inventors
- 👤 Etienne Adrianus Van Thillo
- 👤 Lucien Janbaptist Van Gossum
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 02:02
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: 10
Claim 1
Independent Claim
97 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, characterised in that the antistatic layer is free from any cationic surfactant and consists for at least 70 % by weight of colloidal silica having an average particle size not larger than 10 nm and a surface area of at least 300 m2 per gram, the colloidal silica being present at a coverage of at least 50 mg per m2.
Claim 2
Dependent Claim
97 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, characterised in that the antistatic layer is free from any cationic surfactant and consists for at least 70 % by weight of colloidal silica having an average particle size not larger than 10 nm and a surface area of at least 300 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
31 words
A sheet or web material according to claim 1, wherein the colloidal silica has a surface area of 500 m2 per gram and an average grain size smaller than 7 nm.
Claim 5
Dependent Claim
32 words
A sheet or web material according to any of claims 1 to 3, wherein the coverage of said colloidal silica is in the range of 100 mg to 500 mg per m2.
Claim 6
Dependent Claim
35 words
A sheet or web material according to any of claims 1 to 4, wherein said antistatic layer is coated from an aqueous dispersion of the colloidal silica in the presence of a non-ionic wetting agent.
Claim 7
Dependent Claim
21 words
A sheet or web material according to any of claims 1 to 5, wherein said support is a polyester resin support.
Claim 8
Dependent Claim
39 words
A sheet or web material according to any of the claims 1 to 6, 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 9
Dependent Claim
32 words
A sheet or web material according to claim 7, 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 10
Dependent Claim
21 words
A sheet or web material according to any of claims 1 and 8, wherein said antistatic layer contains friction lowering substances.
References Cited (Backward Citations)
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