SURFACE PROTECTIVE COATING

摘要

An inorganic protective coating of a thickness of from 400 A. to 5 microns is applied to a surface of an article at least the surface of which is formed of a synthetic resin to increase the surface hardness of the said article without any sacrifice in the inherent properties of the said article. The protective coating comprises discrete islets of an inorganic solid each having an area of at most 7 x 104 square microns and being firmly deposited on the synthetic resinous substrate, and being formed by evaporating an inorganic material through a shadow mask or screen onto the surface of the said article.