Photoimageable compositions having improved stripping properties in aqueous alkaline solutions
US5922509A · kind A · utility
5Cited by
11References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1998 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Mar 18, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/121
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A negative-acting photoimageable composition useful as a photoresist comprises an acid-functional binder polymer, a photopolymerizable component, and a photoinitiator chemical system, in which the binder polymer has a multi-modal molecular weight distribution used to promote faster photoresist stripping times and a smaller stripped particle size. The combination of faster stripping times and smaller stripped particle size allows for fully aqueous, environmentally friendly, stripping of the photoresist from overplated circuit boards.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.