Surface-treated vinyl chloride polymer material including an adhering hydrophilic layer

摘要

The adherence of a hydrophilic layer containing a hydrophilic colloid binder upon the surface of a vinyl chloride polymer free of hydrophilic recurring units is improved by exposing the polymer surface to a corona discharge sufficient to satisfy a particular wetting test described in the specification, and colloidal silica is dispersed within the hydrophilic layer in a weight ratio range relative to the binder of 1:5-2:1.