Process for making surface modified U.V. stabilized PVC articles
US4792465A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1987 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Jul 23, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J7/065
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.