Irradiated aromatic polysulphones of increased flow resistance and molecular weight
US3959101A · kind A · utility
4Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1973 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | Jul 23, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/915
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Aromatic polymers of increased resistance to flow and molecular weight are obtained by irradiation using .beta.-rays or .gamma.-rays at temperatures up to 400.degree.C of an aromatic polymer whose molecular chains comprise benzenoid groups and bivalent linking groups, and where irradiation is .gamma.-rays by heating subsequent to irradiation at 200.degree.C to 400.degree.C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.