Conductive paste for large greensheet screening including high thixotropic agent content
US5951917A · kind A · utility
3Cited by
10References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1998 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Mar 6, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K1/092
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Deformation of vias and shorting between vias during screening of conductive paste onto greensheets wider than 185 mm is avoided by a concentration of thixotropic agent in the conductive paste formulation to a concentration which raises the thixotropic index of the paste to within 5% to 25% of the maximum achievable thixotropic index for the organic vehicle in the paste. For a paste containing molybdenum powder in which the organic vehicle is a mixture of ethyl cellulose, texanol and oleoyl sarcosine, this criterion corresponds to a concentration of glycerl tri(-12-hydroxystearate) in the range of 1.4% to 1.8% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.