Patent ID: 6720025
Filing Date: 2004-04-13
Classification: B05D

Abstract:
A method for slot extrusion coating comprising:providing a liquid composition including at least one polymer and a diluent, said composition being substantially free of crosslinking and gellation and having a measurable percent solids; operating a slot extrusion coater wherein said liquid composition is extruded from said slot extrusion coater; determining actual values of minimum wet thickness, Tw,min at a plurality of percent solids levels; obtaining a first graphical curve representing actual values of wet thickness, Tw,min as a function of percent solids level; identifying the critical wet thickness, Tw,min-critical on the first graphical curve; and identifying a window of operability as an area defined by the boundaries: percent solids greater than the point at which critical wet thickness, Tw,min-critical occurs; and an actual wet thickness greater than all points above the first graphical curve and equal to or less than the critical thickness, Tw,min-critical.