US4914018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic photographic base and light-sensitive element
Assignee: 3M Co
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Filing: 1988-12-01
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Granted: 1990-04-03
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Expires: 2008-12-01
Abstract
Abstract An improved antistatic base comprises a polymeric support film having coated thereon in sequence a first antistatic layer comprising a quaternary polyelectrolyte compound and a polymeric hydrophobic binder and a second protective layer comprising a polymeric hydrophobic binder, wherein said quaternary polyelectrolyte compound is a homopolymer or a copolymer of a diallyldialkylammonium salt compound. The antistatic base is particularly useful as a support for light-sensitive silver halide photographic elements.
Inventors
- 👤 Mauro Besio
- 👤 Alberto Valsecchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:52
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89; Y; Y10; Y10S; Y10S430/00; Y10S430/162; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31986
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
60 words
A base for use in a photographic element comprising a polymeric support film having coated thereon in sequence a first antistatic layer comprising a quaternary polyelectrolyte compound and a polymeric hydrophobic binder and a second protective layer comprising a polymeric hydrophobic binder, characterized in that said quaternary polyelectrolyte compound is a homopolymer or a copolymer of a diallyldialkylammonium salt compound.
Claim 2
Dependent Claim
60 words
A base for use in a photographic element comprising a polymeric support film having coated thereon in sequence a first antistatic layer comprising a quaternary polyelectrolyte compound and a polymeric hydrophobic binder and a second protective layer comprising a polymeric hydrophobic binder, characterized in that said quaternary polyelectrolyte compound is a homopolymer or a copolymer of a diallyldialkylammonium salt compound.
Claim 3
Dependent Claim
47 words
The photographic base as claimed in claim 1, wherein said quaternary polyelectrolyte compound is a homopolymer represented by the general formula ##STR3## wherein R 1 and R 2 are each alkyl groups, X - is an anion and n is an integral number, or a copolymer thereof.
Claim 4
Dependent Claim
17 words
The photographic base as claimed in claim 1, wherein said quaternary polyelectrolyte compound is a poly-N,N-dimethyl-3,5-dimethylenepiperidinium chloride.
Claim 5
Dependent Claim
16 words
The photographic base as claimed in claim 1, wherein said polymeric film support is cellulose triacetate.
Claim 6
Dependent Claim
28 words
The photographic base as claimed in claim 1, wherein said first antistatic layer comprises as a polymeric hydrophobic binder a cellulose derivative, a poly-alkyl(meth)acrylate or a silicone resin.
Claim 7
Dependent Claim
27 words
The photographic base as claimed in claim 5, wherein said cellulose derivative is cellulose diacetate, cellulose triacetate, cellulose acetate propionate, cellulose acetate butyrate, nitrocellulose, methylcellulose or ethylcellulose.
Claim 8
Dependent Claim
22 words
The photographic base as claimed in claim 1, wherein said second protective layer comprises as a polymeric hydrophobic binder a cellulose derivative.
Claim 9
Dependent Claim
29 words
The photographic base as claimed in claim 1, wherein said quaternary polyelectrolite compound is present as from 0.10 to 0.35 grams per square meter on said polymeric film support.
Claim 10
Dependent Claim
34 words
The photographic base as claimed in claim 1, wherein said polymeric hydrophobic binder is said firs antistatic layer is present as from 0.05 to 0.30 grams per square meter on said polymeric film support.
Claim 11
Dependent Claim
34 words
The photographic base as claimed in claim 1, wherein said polymeric hydrophobic binder of said second protective layer is present as from 0.10 to 0.50 grams per square meter on said polymeric film support.
Claim 12
Dependent Claim
39 words
A photographic element comprising a polymeric film support having coated on one side a light-sensitive silver halide emulsion layer or layers and coated on the other side a first antistatic layer and a second protective layer of claim 1.
References Cited (Backward Citations)
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US4070189A
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US4267266A
Cited
US4225665A
Cited
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Cited
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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) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |