Photoimageable composition with reduced cold flow due to salt-bridging by metal ions and dry film formed therefrom
US4943513A · kind A · utility
6Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1988 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | Oct 7, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/155
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A photoimageable composition of the negative acting type which includes a binder polymer which contains carboxyl groups is provided with a metal chelate in which the coordination number of the metal is 2 or higher. When the photoimageable composition is coated as a layer on a dry film, the metal chelate reacts with the carboxyl groups of the polymer, releasing a metal ion which bridges carboxyl groups of two or more polymer molecules. This bridging reduces cold flow of the photoimageable composition layer of the dry film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.