Method For Increasing Surface Energy Of Low Energy Substrate Utilizing A Limited Length Corona Or Plasma Discharge Treatment To Improve Adherence Of A Subsequently Applied Secondary Coating Thereto

摘要

A method for improving the adhesion characteristics of a secondary coating to a coated substrate material using a corona or plasma discharge treatment, in which the treatment is limited to a finite duration of time sufficient to increase the surface energy of the coated substrate above that of the secondary coating but insufficient to cause a loss or diminishment of the adhesion between any layers of coating of the coated substrate material or between the bottommost layer of the coating and the bare substrate. A secondary coating is applied to the treated substrate and at a desired thickness and cured or dried, depending upon its composition. The limited duration discharge treatment functions to improve the adhesion of the secondary coating to the coated substrate material without adversely affecting any previously applied coating layers.