Process for making a surface modified polymer article
US5110634A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1989 |
| Grant date | May 5, 1992 |
| Priority date | — |
| Expiry date | May 1, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J7/065
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A surface modified U.V. stabilized article is described which includes a resinous sheet whose sides are both exposed to the air. The surface regions of both sides of the sheet are substantially fully modified in situ with a stabilizing amount of an ingredient such as an ultraviolet light stabilizer material, while the exposed surfaces are substantially free of residual stabilizer and solvent material. The appearance and degree of surface perfection of the modified sides of the sheet are substantially the same as that of an untreated sheet. The U.V. stabilized resin article is made by a continuous process in which the resin body is immersed in a solution of an ultraviolet light stabilizer in a suitable organic solvent, and thereafter, residual stabilizer and solvent are displaced from the modified surfaces in situ. Both steps in the process are carried out in an environment which is non-evaporative of the solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.