Polyester films containing substantially spherical particles useful as slot liners
US4274025A · kind A · utility
14Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1979 |
| Grant date | Jun 16, 1981 |
| Priority date | — |
| Expiry date | Apr 6, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Polyester films containing 0.2 to 0.9% by weight of filler particles having a nominal particle size of 2 to 10 .mu.m and a hardness of 2.5 to 7 on the moh scale are suitable for the production of slot liners and closures. The films have improved resistance to fibrillation or delamination and tearing during the formation of the slot liners and closures and improved slip properties to promote their insertion into electrical stators and rotors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.