KR960025381A

KR960025381A - Method of manufacturing magnetic recording medium

Info

Publication number: KR960025381A
Application number: KR1019940039983A
Authority: KR
Inventors: 심충보; 최동규; 전관승
Original assignee: 배도; 동양폴리에스터 주식회사
Priority date: 1994-12-30
Filing date: 1994-12-30
Publication date: 1996-07-20

Abstract

본 발명은 비자성 지지체상에 강자성 분말을 결합제 중에 분산시킨 자성층을 코팅하여서 된 자기기록 매체에 있어, 자성층에 사용되는 자성체로서 코발트감마페라이트 70~90중량부에 대해서 크롬옥사이드를 30~10중량부 함유하고, 바인더로서 비닐계수지, 우레탄수지, 에폭시, 페녹시계 수지들중 하나 혹은 이들의 조합 형태를 사용하며, 자성체의 분산을 위해 초기 분산 1단계과정에서 상대적으로 분산이 어려운 코발트감마페라이트만을 고형분 50~80%로 하여 믹싱, 분산하고 크롬자성체는 상기의 믹싱이 완성된 뒤 2단계로 고형분을 낮추고 이중에 크롬을 투입하여 고형분이 35~50%가 되도록 하여 믹싱, 분산함을 특징으로 한다. 본 발명에 의한 자기기록 매체는 종래의 자기기록 매체에 비해 분산이 뛰어나고 자기기록성 및 전자특이 현저히 향상 되는 효과가 있다.The present invention is a magnetic recording medium obtained by coating a magnetic layer in which a ferromagnetic powder is dispersed in a binder on a nonmagnetic support, wherein the chromium oxide is 30 to 10 parts by weight based on 70 to 90 parts by weight of cobalt gamma ferrite as a magnetic material used for the magnetic layer. Containing only one of vinyl-based resin, urethane resin, epoxy, phenoxy resin, or a combination thereof, and only cobalt gamma ferrite, which is relatively difficult to disperse in the first stage of dispersing, for solid dispersion Mixing and dispersing to 50-80% and chromium magnetic material is characterized by mixing and dispersing by lowering the solid content in two stages after the above mixing is completed and by adding chromium to 35 to 50% solids. The magnetic recording medium according to the present invention has an effect of excellent dispersion and remarkable improvement of magnetic recording property and electronic characteristics compared with the conventional magnetic recording medium.

Description

Method of manufacturing magnetic recording medium

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

Claims

A method of manufacturing a magnetic recording medium by coating a magnetic layer obtained by dispersing a ferromagnetic powder in a binder on a nonmagnetic support, wherein the ferromagnetic powder used in the magnetic layer is 70 to 90 parts by weight of cobalt gamma ferrite and 30 to 10 weight of chromium oxide. Cobalt gamma ferrite, which contains a part and uses a vinyl-based resin, urethane resin, epoxy, or phenoxy resin, or a combination thereof, and the dispersion of the ferromagnetic powder is relatively difficult to disperse during the first stage of dispersion. Mix and disperse only 50 to 80% of the solid content, mix and disperse the solids in two steps after mixing is completed, and add chromium oxide to make 35 to 50% of the solids. A method of manufacturing a magnetic recording medium.

※ Note: The disclosure is based on the initial application.