Process for making surface modified U.V. stabilized PVC articles

Abstract

What is described herein is a process of making a U.V. stabilized PVC article wherein the surface region of the article is modified with a U.V. stabilizer and the treated surface is substantially free of residual stabilizer thereon. The process includes the steps of (a) applying a solution of a U.V. stabilizer in a solvent which is capable of swelling the PVC but is otherwise non-aggressive thereto, and (b) displacing residual solution remaining on said thus treated surface by a liquid which is non-miscible with said solvent. In the preferred form of the invention, step (b) is carried out by contacting the treated surface with water to cause physical removal of the residual solution out of its position on the treated surface, such as by agitation, a jet stream, ultrasonics, and the like.

Dependencies are inferred from the claim text.