Aromatic polyamide-type films
US3966686A · kind A · utility
125Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1974 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Dec 24, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31739
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Aromatic polyamide-hydrazide films, consisting of p-benzamide p-phenylene terephthalamide and/or terephthaloyl hydrazide recurring units, as major chain constituents, are removed from inorganic residue by an aqueous mixture which dissolves or swells the films, and are heated up to their crystallization temperatures in tension, giving rise to high tensile strength and modulus, good hygroscopic dimensional stability and excellent electrical insulation properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.