Patent ID: 6274223
Filing Date: 2001-08-14
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium comprising:a non-magnetic support member;a magnetic layer formed on either surface of said non-magnetic support member and mainly composed of magnetic powder and a binder; anda backcoat layer formed on another surface of said non-magnetic support member and structured such that non-magnetic powder is dispersed in a binder, whereinsaid backcoat layer contains said non-magnetic powder composed of carbon black and inorganic powder having Moh's hardness of 6 to 9 at a ratio of 90:10 to 85:15, said contained binder is made of phenoxy resin, polyurethane resin and nitrocellulose,said contained carbon black consists of carbon black having an average primary particle size of 25 nm to 55 nm and carbon black having an average primary particle size of 280 nm to 350 nm, andsaid contained inorganic powder consists of inorganic powder having an average primary particle size of 260 nm to 360 nm and inorganic powder having an average primary particle size of 390 nm to 490 nm.