Ultraviolet-curable and alkali-developing type photo solder resist ink
US6136506A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Jun 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D84/038
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An ultraviolet-curable and alkali-developing type photo solder resist ink comprises an epoxy resin obtained by extending chains of an epoxy compound by an isocyanate compound having at least two isocyanate groups per one molecule of the isocyanate compound, an ultraviolet-curable resin having carboxyl group and an ethylenically unsaturated group having a photopolymerization capability, a photopolymerization initiator, and a diluent. The resist ink shows a wide precuring acceptable width for providing an extended shelf life, a good tacky-dry property after a precuring step, excellent light-sensitivity at an exposing step, superior resolution, and improved removability of a film of the resist ink by an alkaline solution at a developing step. In addition, a solder resist obtained by a post-baking step of the resist ink film provides excellent resistances to molten solder and gold plating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.