Electrically chargeable substrate
US6210793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1997 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Nov 21, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31667
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A thin film composed of a silane-based compound comprising an alkyl group or a fluoroalkyl group is bonded to the surface of an electrically insulating substrate through a covalent bond, thus obtaining an electrically chargeable substrate maintaining a charged state for a long time regardless of relative humidity of an atmosphere. A glass plate for placing a sheet in an overhead projector is dipped into a solution comprising CF.sub.3 (CF).sub.7 (CH.sub.2).sub.2 SiCl.sub.3. As a result, a molecular composed of CF.sub.3 (CF.sub.2).sub.7 (CH.sub.2).sub.2 Si(O).sub.3 --is chemically bonded to the glass surface. A high charged state, a water-repelling property having a static contact angle of pure water on the thin film formed on the glass surface of 110 degrees and a volume electric resistivity in the range of 1.times.10.sup.11 -1.times.10.sup.19.OMEGA..multidot.cm are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.