Patent US4051278A successfully refreshed from Google Patents.
US4051278A
Expired / Lapsed
US
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Method for reducing mottle in coating a support with a liquid coating composition
Assignee: Eastman Kodak Co
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Filing: 1975-06-06
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Granted: 1977-09-27
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Expires: 1995-06-06
Abstract
Abstract In coating a support, such as a flexible web of synthetic organic polymer, with a coating composition comprising a film-forming material in an evaporable liquid vehicle, at least two of (1) the temperature of the atmosphere in the coating zone, (2) the temperature of the coating composition at the point where it is coated on the support, and (3) the temperature of the support at the point where the coating composition is applied thereto, are maintained at a temperature substantially equivalent to the equilibrium surface temperature of the coated layer within the coating zone. The equilibrium surface temperature is defined as the temperature assumed by the surface of a layer of the coating composition under steady state conditions of heat transfer following evaporative cooling of the layer in the coating zone. Such temperature control minimizes thermal gradients within the coated layer and significantly reduces the formation of mottle and similar coating defects. The method is especially useful in the coating of organic solvent solutions of polymeric resins and finds particular application in the manufacture of photographic elements.
Inventors
- 👤 Roger E. Democh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/74; G03C2001/7451; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
192 words
In a method of coating a support with a coating compositionn comprising a film-forming material in an evaparable liquid vehicle in which said support is coated with a layer of said coating composition and said coated layer is dried, coating of said layer taking place within a coating zone containing a gaseous atmosphere and evaporation of said liquid vehicle occuring within said coating zone to thereby cause the temperature of the surface of said coated layer to decrease, the improvement which comprises maintaining at least two of (1) the temperature of the atmosphere within said coating zone, (2) the temperature of said support at the point where said coating composition is applied thereto, and (3) the temperature of said coating composition at the point where it is applied to said support, at a temperature which is substantially equivalent to the equilibrium surface temperature of said coated layer within said coating zone, said equilibrium temperature being the temperature assumed by the surface of said coated layer under steady state conditions of heat transfer following evaporative cooling of said layer in said zone, whereby the formation of mottle in said coated layer is reduced.
Claim 2
Dependent Claim
192 words
In a method of coating a support with a coating compositionn comprising a film-forming material in an evaparable liquid vehicle in which said support is coated with a layer of said coating composition and said coated layer is dried, coating of said layer taking place within a coating zone containing a gaseous atmosphere and evaporation of said liquid vehicle occuring within said coating zone to thereby cause the temperature of the surface of said coated layer to decrease, the improvement which comprises maintaining at least two of (1) the temperature of the atmosphere within said coating zone, (2) the temperature of said support at the point where said coating composition is applied thereto, and (3) the temperature of said coating composition at the point where it is applied to said support, at a temperature which is substantially equivalent to the equilibrium surface temperature of said coated layer within said coating zone, said equilibrium temperature being the temperature assumed by the surface of said coated layer under steady state conditions of heat transfer following evaporative cooling of said layer in said zone, whereby the formation of mottle in said coated layer is reduced.
Claim 3
Dependent Claim
190 words
In a method of coating a support with a coating composition comprising a film-forming material in an evaporable liquid vehicle in which said support is coated with a layer of said coating composition and said coated layer is dried, coating of said layer taking place within a coating zone containing a gaseous atmosphere and evaporation of said liquid vehicle occuring within said coating zone to thereby cause the temperature of the surface of said coated layer to decrease, the improvement which comprises maintaining each of (1) the temperature of the atmosphere within said coating zone, (2) the temperature of said support at the point where said coating composition is applied thereto, and (3) the temperature of said coating composition at the point where it is applied to said support, at a temperature which is substantially equivalent to the equilibrium surface temperature of said coated layer within said coating zone, said equilibrium temperature being the temperature assumed by the surface of said coated layer under steady state conditions of heat transfer following evaporative cooling of said layer in said zone, whereby the formation of mottle in said coated layer is reduced.
Claim 4
Dependent Claim
190 words
In a method of coating a support with a coating composition comprising a film-forming material in an evaporable liquid vehicle in which said support is coated with a layer of said coating composition and said coated layer is dried, coating of said layer taking place within a coating zone containing a gaseous atmosphere and evaporation of said liquid vehicle occuring within said coating zone to thereby cause the temperature of the surface of said coated layer to decrease, the improvement which comprises maintaining each of (1) the temperature of the atmosphere within said coating zone, (2) the temperature of said support at the point where said coating composition is applied thereto, and (3) the temperature of said coating composition at the point where it is applied to said support, at a temperature which is substantially equivalent to the equilibrium surface temperature of said coated layer within said coating zone, said equilibrium temperature being the temperature assumed by the surface of said coated layer under steady state conditions of heat transfer following evaporative cooling of said layer in said zone, whereby the formation of mottle in said coated layer is reduced.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein said film-forming material is a polymeric resin and said evaporable liquid is an organic solvent, said resin being dissolved in said solvent.
Claim 6
Dependent Claim
13 words
The method of claim 3 wherein said coating composition additionally contains a pigment.
Claim 7
Dependent Claim
13 words
The method of claim 4 wherein said coating composition additionally contains a surfactant.
Claim 8
Dependent Claim
43 words
The method of claim 1 wherein said film-forming material is a polymeric resin and said evaporable liquid is an organic solvent having a boiling point at atmospheric pressure of from about 40° to about 85° C said resin being dissolved in said solvent.
Claim 9
Dependent Claim
26 words
The method of claim 1 wherein said film-forming material is a cellulose ester and said evaporable liquid is acetone, said ester being dissolved in said acetone.
Claim 10
Dependent Claim
28 words
The method of claim 1 wherein said film-forming material is a cellulose ester and said evaporable liquid is methyl ethyl ketone, said ester being dissolved in said ketone.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein said support is a web of synthetic organic polymeric material.
Claim 12
Dependent Claim
12 words
The method of claim 1 wherein said support is a polyethylene film.
Claim 13
Dependent Claim
13 words
The method of claim 1 wherein said support is a polyethylene terephthalate film.
Claim 14
Dependent Claim
14 words
The method of claim 1 wherein said support is a web of polyethylene-coated paper.
Claim 15
Dependent Claim
13 words
The method of claim 1 wherein said film-forming material is an acrylic polymer.
Claim 16
Dependent Claim
33 words
The method of claim 1 wherein said coating composition is coated on said support at a wet coverage of from about 0.01 to about 100 cubic centimeters per square foot of support surface.
Claim 17
Dependent Claim
33 words
The method of claim 1 wherein said coating composition is coated on said support at a wet coverage of from about 0.5 to about 10 cubic centimeters per square foot of support surface.
Claim 18
Dependent Claim
31 words
The method of claim 1 wherein said support is a web which is advanced through said coating zone at a speed of from about 50 to about 500 feet per minute.
References Cited (Backward Citations)
CA752333A
Cited
US1829153A
Cited
US1851509A
Cited
US2269169A
Cited
US2795522A
Cited
US2815307A
Cited
US2808340A
Cited
US3082144A
Cited
US3067056A
Cited
US3395034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |