Antichafing strip for shaving equipment head and shaving equipment head comprising same
US6405438B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Jun 28, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7186
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The anti-friction strip of the invention for a discardable razor is obtained by extruding a polymer mixture comprising an insoluble polymer material and polyethylene oxide. It has an initial coefficient of dynamic friction (KD) of the order of or less than 0.2. The mixture for extrusion includes, as its polyethylene oxide, only a substance whose mean molecular weight is greater than 3.5 million. The strip is preferably obtained by extruding a mixture comprising polystyrene and polyethylene oxide having a mean molecular weight greater than 4 million, and in particular a single polyethylene oxide having a molecular weight greater than 7 million. The invention also provides a shaving head having the above-specified anti-friction strip fixed thereto by ultrasonic welding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.