EP0127820A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Antistatic photographic base, method for preparing it and photographic element comprising said base
Assignee: 3M Co
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Filing: 1984-05-17
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Granted: —
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Expires: 2004-05-17
Abstract
Abstract A photographic base is protected against the adverse effects resulting from the accumulation of static electrical charges by providing it with a first antistatic hydrophilic layer and a second protective hydrophobic layer coated onto said first layer, said first layer having been formed by coating onto said base a liquid coating composition comprising a hydrophilic non-diffusing sulfonated polymer in the presence of an epoxy-silane compound. The antistatic base is particularly useful for photographic elements comprising at least one photosensitive image-forming layer, on one side thereof, and the first antistatic layer and the second protective layer on the opposite side thereof. The antistatic layer is durable, abrasion-resistant, non-tacky and can withstand the aqueous photographic processings without adverse effects.
Inventors
- 👤 Alberto Valsecchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 02:02
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31652; Y10T428/31663; Y10T428/31971
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
54 words
A photographic base comprising a polymeric support film coated with a first antistatic hydrophilic layer and a second protective hydrophobic layer coated onto said first layer, said first layer having been formed by coating onto said support a liquid coating composition comprising a hydrophilic non-diffusing sulfonated polymer in the presence of an epoxy-silane compound.
Claim 2
Dependent Claim
54 words
A photographic base comprising a polymeric support film coated with a first antistatic hydrophilic layer and a second protective hydrophobic layer coated onto said first layer, said first layer having been formed by coating onto said support a liquid coating composition comprising a hydrophilic non-diffusing sulfonated polymer in the presence of an epoxy-silane compound.
Claim 3
Dependent Claim
15 words
The photographic base as claimed in claim 1, wherein said support film is cellulose triacetate.
Claim 4
Dependent Claim
17 words
The photographic base as claimed in claim 1, wherein said hydrophilic sulfonated polymer is polystyrene sulfonic acid.
Claim 5
Dependent Claim
38 words
The photographic base as claimed in claim 1, wherein said hydrophilic sulfonated polymer is polyvinyltoluene sulfonic acid, polyindene sulfonic acid, (butylmethacrylate-vinyltoluene sulfonic acid) copolymer, (butylacrylate-styrene sulfonic acid) copolymer, (ethylhexylacrylate-styrene sulfonic acid) copolymer, polyvinyl sulfonic acid or polyvinylbenzal-2,4-disulfonic acid.
Claim 6
Dependent Claim
27 words
The photographic base as claimed in claim 1, wherein said protective hydrophobic film-forming layer is formed by coating a liquid composition comprising a hydrophobic film-forming polymeric substance.
Claim 7
Dependent Claim
15 words
The photographic base of claim 5, wherein said hydrophobic film-forming substance is a cellulose derivative.
Claim 8
Dependent Claim
26 words
The photographic base as claimed in claim 5, wherein said cellulose derivative is cellulose diacetate, cellulose triacetate, cellulose acetate propionate, cellulose acetate butyrate, methylcellulose or ethylcellulose.
Claim 9
Dependent Claim
20 words
The photographic base as claimed in claim 5, wherein said hydrophobic film-forming polymeric substance is a synthetic polymer or copolymer.
Claim 10
Dependent Claim
36 words
The photographic base as claimed in claim 8, wherein said synthetic polymer or copolymer is a polymer or copolymer of a polymerizable monomer selected from styrene, vinyl ethers, vinyl esters, vinyl ketones, vinyl chloride and acrylonitrile.
Claim 11
Dependent Claim
64 words
The photographic base as claimed in claim 1, wherein said epoxy-silane compound is represented by one of the formulas: wherein: R is a divalent hydrocarbon group of less than 20 carbon atoms; R is hydrogen, an aliphatic hydrocarbon group of less than 10 carbon atoms, an acyl group of less than 10 carbon atoms; n is 0 or 1; and is 1 to 3.
Claim 12
Dependent Claim
49 words
The photographic base as claimed in claim 1, wherein said epoxy-silane compound is represented by one of the formulas: wherein: R 2 and R 3 are independently alkylene groups of 1 to 4 carbon atoms} and R 4 is hydrogen or alkyl groups of 1 to 10 carbon atoms.
Claim 13
Dependent Claim
16 words
The photographic base as claimed in claim 1, wherein said functional epoxy-silane compound is f-glycydoxypropyltrimethoxy- silane.
Claim 14
Dependent Claim
14 words
The photographic base as claimed in claim 1, wherein said epoxy-silane compound is ß-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane.
Claim 15
Dependent Claim
89 words
A photographic element comprising a polymeric film support, at least one photosensitive image-forming layer on one side of said support and an antistatic layer on the opposite side of said support, said antistatic layer comprising a first antistatic hydrophilic layer and a second protective hydrophobic layer coated onto said first layer, said first layer having been formed by coating onto said support a liquid coating composition comprising a hydrophilic non-diffusing sulfonated polymer in the presence of an epoxy-silane compound, as claimed in any of claims from 1 to 13.
Claim 16
Independent Claim
123 words
A method for providing an antistatic layer for a photographic element comprising a polymeric support film coated on one side with at least one photosensitive image-forming layer, said antistatic layer being durable, abrasion-resistant, non-tacky and resistant to attack by the aqueous processing baths employed in photographic processing, which comprises coating on the opposite side of said support a first liquid composition comprising a hydrophilic non diffusing sulfonated polymer and an epoxy-silane compound and drying the coated composition to form a first layer, then coating a second liquid composition comprising a hydrophobic film-forming polymeric substance and drying the coating to form a second layer, the solvent of said second liquid composition being substantially unable to dissolve the hydrophilic sulfonated polymer of the first-coated layer.
Claim 17
Independent Claim
123 words
A method for providing an antistatic layer for a photographic element comprising a polymeric support film coated on one side with at least one photosensitive image-forming layer, said antistatic layer being durable, abrasion-resistant, non-tacky and resistant to attack by the aqueous processing baths employed in photographic processing, which comprises coating on the opposite side of said support a first liquid composition comprising a hydrophilic non diffusing sulfonated polymer and an epoxy-silane compound and drying the coated composition to form a first layer, then coating a second liquid composition comprising a hydrophobic film-forming polymeric substance and drying the coating to form a second layer, the solvent of said second liquid composition being substantially unable to dissolve the hydrophilic sulfonated polymer of the first-coated layer.
References Cited (Backward Citations)
No citation records indexed.
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