Permanent antistatic primer layer
US6225040A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1994 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31797
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided a method for preparing a biaxially oriented polyester sheet or web, with improved antistatic properties, comprising the steps of PA1 (i) stretching said polyester sheet or web first in one direction and second in a direction perpendicular thereto PA1 (ii) coating said hydrophobic polyester sheet or web, either before stretching or between said first and second stretching operation, on one or both sides, with a transparent antistatic primer layer, wherein the coating composition of said transparent antistatic primer layer comprises (1) a dispersion of a polythiophene with conjugated polymer backbone and a polymeric polyanion compound and (2) a latex polymer having hydrophilic functionality. The primer layer is coated from an aqueous composition and does not show a substantial change in resistivity depending on relative humidity or wet processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.