公开(公告)号：JPS6423416A

公开(公告)日：1989-01-26

申请号：JP15954888

申请日：1988-06-29

Applicant: BASF AG

Inventor： NORUBERUTO SHIYUNAIDAA ,  UBUE NOBUATSUKU ,  GERUTO NIKORAI ,  URUZURA KURAIN ,  BUERUNAA RENTSU ,  HERUMUUTO YAKUSHIYU ,  FUORUKAA KOTSUHO ,  FURIIDORITSUHI DOMASU

IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708 ,  G11B5/82

Abstract: PURPOSE: To always impart the required amt. of a lubricant by incorporating a porous pigment having 300-1,000m /g BET specific surface area into the surface layer part of a magnetic layer by 1-10wt.% of the amt. of a magnetic material when at least one side of a nonmagnetic substrate is coated with the magnetic layer. CONSTITUTION: When at least one side of a nonmagnetic substrate is coated with a magnetic layer, this magnetic layer is made of a magnetic material finely dispersed in an org. binder and a porous pigment having 300-1,000m /g BET specific surface area is incorporated into the surface layer part of the magnetic layer by 1-10wt.%, preferably 2-6wt.% of the amt. of the magnetic material so as to reduce friction. The pigment is made of a molecular filter based on metal-aluminum silicate having a special crystal structure and the spaces in a three-dimensional network structure are formed by the reaction of aq. solns. of sodium aluminate and sodium silicate. Sticking effect is also reduced.