Method for synthesizing polyamic acid for manufacturing flexible amorphous silicon solar cell
US5693745A · kind A · utility
2Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1996 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Feb 8, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present method provides a method for preparing the PI varnish which has the steps of: 1) preparing a mixed solution of 60-100% by weight aprotic solvent, and 0-40% by weight aromatic solvent; 2) adding into the mixed solution in a mole ratio of 1:9 two aromatic diamines; and 3) further adding in the mixed solution in a mole ratio of 1:5 two aromatic dianhydrides. Such PI has a suitable thermal expansion coefficient and characteristics different form those of the PI currently in use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.