| 摘要 |
PURPOSE:To obtain a thin ferromagnetic metallic film type magnetic recording medium having superior wear resistance and durability by forming a thin ferromagnetic metallic film on a nonmagnetic support and sticking an extreme pressure agent contg. halogen and an extreme pressure agent contg. sulfur to the metallic film so as to maintain the lubricity for a long period and to reduce the coefft. of friction. CONSTITUTION:An extreme pressure agent reacts with a metallic surface by frictional heat when the agent is brought into partial contact with the metal in a boundary lubricating region, and the agent performs friction and wear preventing actions by a formed reaction product film. Extreme pressure agents contg. halogen include bromine compounds such as allyl bromide, iodine compounds such as benzyl iodine and chlorine compounds such as hexa chloroethane. Extreme pressure agents contg. sulfur include sulfurized fats and oils, disulfides such as dibenzyl disulfide, monosulfides such as dibenzyl sulfide and polysulfides such as dimethyl trisulfide. An extreme pressure agent contg. halogen and an extreme pressure agent contg. sulfur are added to a lubricant acting usually as an oily agent and stuck to a thin ferromagnetic metallic film to form a protective layer. |
