Para-aramid fibrid film
US9194061B2 · kind B2 · utility
1Cited by
20References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2004 |
| Grant date | Nov 24, 2015 |
| Priority date | — |
| Expiry date | Mar 22, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249924
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A para-aramid fibrid film is disclosed that has at least 95% of the bonds of the polymer are para-oriented. A method for making said para-aramid fibrid film by (a) polymerizing a para-oriented aromatic diamine and a para-oriented aromatic dicarboxylic acid halide to an aramid polymer having only para-oriented bonds in a mixture of solvents consisting of N-methylpyrrolidone or dimethylacetamide and calcium chloride or lithium chloride to obtain a dope wherein the polymer is dissolved in the mixture of solvents and the polymer concentration is 2 to 6 wt. %, and (b) converting the dope to para-aramid fibrid film is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.