US4508764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating process employs surfactants
Assignee: Agfa Gevaert NV
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Filing: 1982-12-14
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Granted: 1985-04-02
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Expires: 2002-12-14
Abstract
Abstract Incorporation of a fluorocarbon and a hydrocarbon surfactant in a photographic silver halide emulsion for high speed slide flow coating increases coating latitude by reducing a disruptive standing wave and allowing broader vacuum pressure ranges. The increased coating latitude is particularly advantageous at coating speeds above 100 meters per minute when the emulsion contains from 0.02 to 2 g of fluorocarbon surfactant per 1.5 moles of silver halide.
Inventors
- 👤 Michael D. Zeldes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:15
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/38; G03C1/385; B; B05; B05C; B05C5/00; B05C5/007; G03C1/74; B05C9/00; B05C9/06; G03C2001/7411
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
In a process of slide flow coating wherein a stream of silver halide emulsion flows onto a moving support or web under vacuum conditions and, just prior to contact, said stream of emulsion exhibits a standing wave which causes nonuniform coating, ribbing or streaking as defects in the coating the improvement comprising reducing said standing wave by incorporating in the emulsion a hydrocarbon surfactant in combination with a surfactant.
Claim 2
Dependent Claim
69 words
In a process of slide flow coating wherein a stream of silver halide emulsion flows onto a moving support or web under vacuum conditions and, just prior to contact, said stream of emulsion exhibits a standing wave which causes nonuniform coating, ribbing or streaking as defects in the coating the improvement comprising reducing said standing wave by incorporating in the emulsion a hydrocarbon surfactant in combination with a surfactant.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the hydrocarbon surfactant is octyl phenoxy polyethoxy ethanol, sodium myreth sulphate, or ethylene oxide condensate.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the emulsion contains from 0.02 to 2 g of fluorinated surfactant per 1.5 mole of silver halide.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein an auxiliary layer is coated simultaneously over the emulsion layer, and contains from 0.1 to 2 g of fluorinated surfactant per 200 g of gelatin.
Claim 6
Dependent Claim
109 words
In a process of slide flow coating wherein a stream of silver halide emulsion flows onto a moving support or web under vacuum conditions and, just prior to contact, said stream of emulsion exhibits a standing wave which causes nonuniform coating, ribbing or streaking as defects in the coating, the improvement which comprises reducing said standing wave by incorporating in the emulsion a hydrocarbon surfactant in combination with 0.2 to 2 g of a fluorinated alkyl polyoxyethylene ethanol surfactant per 1.5 mole of silver halide, whereby a coating speed of about 100 meters/minute is maintained, and coating the silver halide emulsion simultaneously with a layer of an auxiliary coating.
Claim 7
Dependent Claim
109 words
In a process of slide flow coating wherein a stream of silver halide emulsion flows onto a moving support or web under vacuum conditions and, just prior to contact, said stream of emulsion exhibits a standing wave which causes nonuniform coating, ribbing or streaking as defects in the coating, the improvement which comprises reducing said standing wave by incorporating in the emulsion a hydrocarbon surfactant in combination with 0.2 to 2 g of a fluorinated alkyl polyoxyethylene ethanol surfactant per 1.5 mole of silver halide, whereby a coating speed of about 100 meters/minute is maintained, and coating the silver halide emulsion simultaneously with a layer of an auxiliary coating.
Claim 8
Dependent Claim
13 words
The process of claim 5 wherein the auxiliary coating is an antiabrasion layer.
Claim 9
Dependent Claim
10 words
A coated article made by a process of claim 5.
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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) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |