Method for modifying surface properties of shaped articles of vinyl chloride based resin with low temperature plasma
US4315808A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1980 |
| Grant date | Feb 16, 1982 |
| Priority date | — |
| Expiry date | May 13, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides a novel method for preventing bleeding of a plasticizer or other additive ingredients contained in a shaped article of a vinyl chloride-based resin composition on to the surface of the article by the treatment with low temperature plasma. Different from conventional procedures for the plasma treatment, much improved reliability and reproducibility as well as effectiveness are obtained by subjecting the article to intermittent exposure to the plasma atmosphere instead of continuous exposure. In the inventive method, the overall treatment time is an alternate sequence of exposure times, each being of the length of 0.001 second to 1000 seconds, and repose times, each being also of the length of 0.001 second to 1000 seconds. The gas for the plasma atmosphere is desirably an inorganic gas selected from the gases other than oxygenic gases, halogen containing gases and sulfur containing gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.