Patent ID: 7789396
Filing Date: 2010-09-07
Classification: F16J

Abstract:
1. An oil seal comprising: a seal lip made of a rubber elastic material and provided with an air-side slope and a sealing fluid-side slope on both sides of a lip edge part, wherein the air-side slope has a coating film on the surface thereof, and a portion in contact with a shaft in the lip edge part is so made that a sealing fluid-side rubber part and an air-side coating film simultaneously contact with the shaft, wherein the coating film is formed of a coating agent for a vulcanized rubber comprising an organic solvent solution which includes 10 to 160 weight parts of a polyethylene resin and 10 to 160 weight parts of a fluororesin with respect to 100 weight parts of an isocyanate group containing 1,2-polybutadiene or a 1,2-polybutadiene mixture made by blending a hydroxyl group containing 1,2-polybutadiene with the isocyanate group containing 1, 2-polybutadiene and a solvent; a particle diameter of the fluororesin is 0.1 to 10 μm; and a coat thickness of the coating film is 2 to 7 μm.