Patent ID: 6777072
Filing Date: 2004-08-17
Classification: G11B,Y10T

Abstract:
A magnetic recording medium comprising:a) a substrate, b) at least one lower layer on said substrate, said at least one lower layer containing at least one binder in a binder matrix and at least one inorganic pigment, and c) at least one upper magnetic layer on said at least one lower layer, said at least one upper layer containing at least one magnetic pigment P2 and at least one binder in a binder matrix and at least one nonmagnetic pigment P3, (1) the binder matrix of the at least one upper magnetic layer comprising at least one binder, said at least one binder exclusively having a Tg of at least 50Â° C. and the binder matrix of the at least one lower layer containing at least one binder having a Tg<50 C.; (2) the at least one nonmagnetic pigment P3 of the at least one upper magnetic layer having a particle size which corresponds at least to the dry thickness of the upper magnetic layer; and (3) the upper magnetic layer containing at least one compound (A) and at least one compound (B), said at least one compound (A) comprising at least one compound of the following formula (A): R1â€”COOâ€”(R3â€”O)mâ€”R2â€ƒâ€ƒ(A) â€ƒwhere R1 is a saturated or unsaturated, straight-chain or branched hydrocarbon radical of 11 to 22 carbon atoms; R2 is a saturated or or unsaturated, straight-chain or branched hydrocarbon radical of 1 to 6 carbon atoms; R3 is an alkylene radical of 1 to 4 carbon atoms; and m is an integer from 2 to 4; and said at least one compound (B) comprising at least one compound of the following formula (B): R1â€”COOâ€”R4â€ƒâ€ƒ(B) â€ƒwhere R1 is as defined above and R4 is a saturated or mono-or polyunsaturated, straight-chain or branched hydrocarbon radical of 4 to 8 carbon atoms.