Coating processes – With pretreatment of the base – Organic base
Patent
1975-06-06
1977-09-27
Smith, Ronald H.
Coating processes
With pretreatment of the base
Organic base
427262, 427280, 427322, 427374A, 427374R, 96 87R, 96 94R, 118 59, 118 68, 118 69, B05D 300, B05D 304
Patent
active
040512789
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.
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Eastman Kodak Company
Lawrence Evan K.
Lorenzo A. P.
Smith Ronald H.
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