Butyl rubber with increased impermeability
US9745388B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 16, 2013 |
| Grant date | Aug 29, 2017 |
| Priority date | — |
| Expiry date | Feb 4, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Surface modification methods based on a combination of plasma and chemical treatments render an unfilled butyl rubber surface highly reactive toward organosilanes, allowing formation of an organosilane self-assembled monolayer (SAM). Plasma oxidation of the butyl rubber surface followed by vapor deposition of SiCl4 produces a hydrophilic surface suitable for anchoring organosilanes. Fabrication of SAMs on this hydrophilic butyl rubber surface with n-octadecyltrichlorosilane (OTS) and trichloro(1H,1H,2H,2H-perfluorooctyl)silane (FOTS) via vapor deposition resulted in a 15% and 25% decrease in gas permeability, respectively, with no change in optical transparency of the butyl rubber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.