Eastman-kodak Company

Terence D Blake

Kenneth J Ruschak

Andrew Clarke

Gregory N Batts

William James Harrison

Rosemary Dobson

Stephen David Morley

A method for curtain coating various compositions at high speed onto a continuously moving receiving surface comprises

Method for electrostatically assisted curtain coating at high speeds

Method for curtain coating at high speeds

It is well known that coating speeds are limited due to the onset of air entrainment. These limiting coating speeds have been found to be highest on solid surfaces of intermediate wettability with respect to water, and in particular, on surfaces having high dispersion and low polar surface free energies as determined by contact angle analysis. Described herein is a method of controlling the solid surface free energies, and hence maximum coating speeds, by using suitably chosen surfactants in subbing layers and pre-coated packs of the material being coated. Aromatic hydrocarbon ionic surfactants, such as Alkanol XC, aryl-ended sulphosuccinates and aryl-ended tricarballylates, are particularly beneficial in this respect.

Coating processes

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Tring, United Kingdom

Terence D Blake