Razor blades and razors
Razors are described herein. In some instances the razors include a safety razor blade unit comprising a guard, a cap, and at least two blades with parallel sharpened edges located between the guard and cap. A first blade defines a blade edge nearer the guard and a second blade defines a blade edge nearer the cap. The first blade has a cutter force greater than the cutter force of the second blade. In some instances the razors provide a comfortable shave having improved closeness.
1. A razor comprising:
a safety razor blade unit comprising a guard, a cap, and at least two blades with parallel sharpened edges located between the guard and cap, wherein the blades are coated with different configurations of polymer coatings providing different frictional resistances, the at least two blades including a first blade defining a blade edge nearer the guard and a second blade defining a blade edge nearer the cap, wherein the polymer coating configuration of the first blade comprises at least a portion of the coating thereof being modified to increase the frictional resistance thereof such that the first blade has a frictional resistance hair cutter force at least about 0.1 lbs. greater than the frictional resistance hair cutter force of the second blade.
2. The razor of claim 1 wherein the first blade has a frictional resistance hair cutter force at least about 0.2 lbs. greater than the frictional resistance hair cutter force of the second blade.
3. The razor of claim 1 wherein the first blade has a frictional resistance hair cutter force from about 0.1 lbs. to about 1.0 lbs. greater than the frictional resistance hair cutter force of the second blade
4. The razor of claim 3 wherein the first blade has a frictional resistance hair cutter force from about 0.1 lbs. to about 0.5 lbs. greater than the frictional resistance hair cutter force of the second blade.
5. The razor of claim 4 wherein the first blade has a frictional resistance hair cutter force from about 0.2 lbs. to about 0.3 lbs. greater than the frictional resistance hair cutter force of the second blade.
6. The razor of claim 1 , wherein the frictional resistance hair cutter force of the first blade is between about 1.2 lbs and 1.5 lbs.
7. The razor of claim 1 wherein at least one of the polymer coatings is polyfluorocarbon.
8. The razor of claim 7 wherein the polyfluorocarbon is polytetrafluoroethylene.
9. The razor of claim 1 wherein the at least two blades comprises three blades with parallel sharpened edges.
10. The razor of claim 9 wherein the first blade is the blade nearest to the guard.
11. The razor of claim 9 wherein the first blade is not the blade nearest to the guard.
12. The razor of claim 1 wherein the at least two blades comprises four blades with parallel sharpened edges.
13. The razor of claim 12 wherein the first blade is the blade nearest to the guard.
14. The razor of claim 12 wherein the first blade is not the blade nearest to the guard.
15. The razor of claim 1 wherein the at least two blades comprises five blades with parallel sharpened edges.
16. The razor of claim 15 wherein the first blade is the blade nearest to the guard.
17. The razor of claim 15 wherein the first blade is not the blade nearest to the guard.
18. The razor of claim 1 wherein the polymer coating of the first blade is modified by exposure to plasma.
19. The razor of claim 1 wherein the polymer coating of the first blade is modified by exposure to electric current.
20. The razor of claim 1 wherein the polymer coating of the first blade is modified by exposure to a laser or electron beam.