公开(公告)号：JP2003115105A

公开(公告)日：2003-04-18

申请号：JP2002209345

申请日：2002-07-18

Applicant: EMTEC MAGNETICS GMBH

Inventor： MUELLER STEFAN ,  SANDROCK JOHANNES ,  STURM ANDREA ,  GOEDE WOLFGANG ,  KOHL ALBERT ,  RAETHER BENEDIKT

IPC: G11B5/702 ,  G11B5/62 ,  G11B5/706 ,  G11B5/708 ,  G11B5/71 ,  G11B5/738 ,  G11B5/84

Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium nearly free from friction between the surface of a magnetic layer and a magnetic head. SOLUTION: The magnetic recording medium comprising a substrate, a lower layer and an upper magnetic layer is characterized in that a binder matrix of the upper magnetic layer has at least 50 deg.C glass transition temperature, a binder matrix of the lower layer contains at least one binder having -COO-(R -O)m -R ( wherein, R denotes a hydrocarbon group, R denotes a hydrocarbon group, R denotes an alkylene group and m denotes an integer of 1-4) and at least one compound represented by the formula R -COO-R (wherein R is as defined above and R denotes a hydrocarbon group). The manufacturing method for the magnetic recording medium is also provided.

公开(公告)号：DE10135957A1

公开(公告)日：2003-02-13

申请号：DE10135957

申请日：2001-07-24

Applicant: EMTEC MAGNETICS GMBH

Inventor： MUELLER STEFAN ,  SANDROCK JOHANNES ,  STURM ANDREA ,  GOEDE WOLFGANG ,  KOHL ALBERT ,  RAETHER BENEDIKT

IPC: G11B5/702 ,  G11B5/62 ,  G11B5/706 ,  G11B5/708 ,  G11B5/71 ,  G11B5/738 ,  G11B5/84 ,  G11B5/68

Abstract: A magnetic recording medium has on a support: (A) a lower layer containing a binder and an inorganic pigment (P1); and (B) an upper layer containing a binder and a magnetic pigment (P2), as well as a non-magnetic pigment (P3). A magnetic recording medium has on a support: (A) a lower layer containing a binder and an inorganic pigment (P1); (B) an upper layer containing a binder and a magnetic pigment (P2); and (C) a non-magnetic pigment (P3). The recording medium is such that: (i) binder (B) has Tg ≥ 50 degrees C and binder (A) a Tg below 50 degrees C; (ii) pigment (P3) has a particle size at least corresponding to the layer (B) dry thickness; and (iii) the layer (B) contains an alkoxylated fatty ester compound of formula R -COO-(R -O)m-R (I) as well as a fatty ester of formula R -COO-R (III): R = optionally unsaturated 11-22C hydrocarbyl group; R = optionally unsaturated 1-6C hydrocarbyl group; R = 1-4C alkylene; m = 1-4; and R = optionally unsaturated 4-8C hydrocarbyl group.