Razor blades and processes for the preparation thereof |
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| 申请号 | US3652342D | 申请日 | 1967-06-07 | 公开(公告)号 | US3652342A | 公开(公告)日 | 1972-03-28 |
| 申请人 | GILLETTE CO; | 发明人 | FISCHBEIN IRWIN W; FLAHERTY FRANCIS E; MCLAUGHLIN EDWARD P; WILLETT FRED T; | ||||
| 摘要 | The present invention is concerned with steel razor blades having a fluorocarbon polymeric coating thereon and more particularly with processes for producing improved blades of that nature. Generally, the improvements are brought about by providing a thin, cubic iron oxide layer beneath the polymeric coating. | ||||||
| 权利要求 | 2. A process as defined in claim 1 wherein said blade is a carbon steel blade. 3. A process as defined in claim 1 wherein said cubic iron oxide layer is in the range of about 50 to 800 Angstroms in thickness. 4. A process as defined in claim 1 wherein essentially the entire surface area immediately underlying said fluorocarbon polymer coating on said cutting edge is covered by said cubic iron oxide. 5. A process as defined in claim 1 wherein said blade is a carbon steel blade and said cubic iron oxide layer is in the range of about 50 to 800 Angstroms in thickness. 6. A process as defined in claim 1 wherein the fluorocarbon polymeric coating is polytetrafluoroethylene. 7. A process as defined in claim 1 wherein said cubic iron oxide layer is formed during the sintering step by carrying out said sintering in a limitedly oxidizing atmosphere. 8. A process as defined in claim 7 wherein the blade is a carbon steel blade and the cubic oxide is in the range of about 50 to 800 Angstroms in thickness. 9. A process as defined in claim 1 wherein said cubic oxide layer is formed prior to the sintering step. 10. A process as defined in claim 1 wherein said cubic oxide layer is formed subsequent to the sintering step. 11. In a process of applying a fluorocarbon polymeric coating to a steel blade cutting edge and sintering the coating to adhere it to the edge, the improvement of carrying out the sintering step in a slightly oxidizing atmosphere at a temperature between 600* and 750* F. for a time which will provide a cubic iron oxide layer in a range of about 50 to 800 Angstroms in thickness over a major portion of the surface of the cutting edge immediately underlying said fluorocarbon polymeric coating. |
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