Protective coating of plastic substrates via plasma-polymerization
US5569497A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1994 |
| Grant date | Oct 29, 1996 |
| Priority date | — |
| Expiry date | Oct 31, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C16/401
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A protective layer or film is deposited onto a face surface of a plastic substrate, e.g., a PMMA shaped article, by (a) placing such plastic substrate on a weakly or unpolarized electrode comprising a plasma-generating circuit, (b) plasma-pretreating the plastic substrate in an oxygen plasma, under primary vacuum, by a pulse of electrical power density of such minimum magnitude as to oxygen-activate a face surface thereof, and (c) plasma-polymerizing at least one organosilicon monomer onto the face surface of said plastic substrate, also under vacuum and from an oxygen/organosilicon monomer plasma, whereby depositing a thin protective layer or film thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.