| 摘要 |
<p>METHOD FOR REDUCING MOTTLE IN COATING A SUPPORT WITH A LIQUID COATING COMPOSITION In coating a support, such as a flexible web of synthetic organic polymer, with a coating composition comprising a film-forming material in a 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. This 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.</p> |
