Antistatic opacifying layer for photographic roll film
US5876844A · kind A · utility
0Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1997 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | Apr 24, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31902
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention is a backing paper for photographic roll film. The backing paper includes a paper base having a first side and a second side. Superposed on the first side of the paper base is an antistatic opacifying layer which includes polyethylene and at least 10 weight percent of conductive carbon black particles, the carbon black particles having a surface chemistry of less than 1.5 percent by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.