KR940020310A - Magnetic recording medium - Google Patents

Magnetic recording medium Download PDF

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Publication number
KR940020310A
KR940020310A KR1019930002048A KR930002048A KR940020310A KR 940020310 A KR940020310 A KR 940020310A KR 1019930002048 A KR1019930002048 A KR 1019930002048A KR 930002048 A KR930002048 A KR 930002048A KR 940020310 A KR940020310 A KR 940020310A
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KR
South Korea
Prior art keywords
coercive force
average particle
recording medium
particle size
magnetic recording
Prior art date
Application number
KR1019930002048A
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Korean (ko)
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KR100282008B1 (en
Inventor
야코브 하랄트
쉬바프 에게하르트
쾨르너 라인하르트
뮐러 노르베르트
레네르트 루디
오링어 만프레트
아우베터 헬무트
야쿠쉬 헬무트
존 베이치 로날드
보브리히 미하엘
Original Assignee
베른하르트 라이싱어, 라이너 트리쉬만
바스프 마그네틱스 게엠베하
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Priority to KR1019930002048A priority Critical patent/KR100282008B1/en
Publication of KR940020310A publication Critical patent/KR940020310A/en
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Publication of KR100282008B1 publication Critical patent/KR100282008B1/en

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Abstract

비자성 기판 및 그 상부에 적용된 최소한 하나의 자성층을 포함하며, 중합 바인더 및 첨가제 내에 균일하게 분포된 바늘모양의 이산화크롬을 포함하며 최소한 60KA/m의 보자력을 가지며, 상기 이산화크롬의 평균입경이 300nm보다 작으며, 그 HD 인자는인 식을 만족하는 자기기록 매체에 관한 것이다.A nonmagnetic substrate and at least one magnetic layer applied thereon, including needle-shaped chromium dioxide uniformly distributed in the polymeric binder and the additive, having a coercive force of at least 60 KA / m, and having an average particle diameter of 300 nm Less than, and the HD factor is A magnetic recording medium satisfies the recognition.

여기서 KT는 380KA/m의 외부장에서 측정된 [KA/m]단위의 자성층의 보자력이고, L은 평균입경이고, ㅿL은 입자크기 분포 범위이며, 입경의 수치분포로부터 결정되며, 상기 양자는 [nm단위로 측정되며, 1.85보다 크다, 이 이산화크롬의 준비공정에 관한 것이다.Where KT is the coercive force of the magnetic layer in [KA / m] units measured at an external field of 380KA / m, L is the average particle diameter, ㅿ L is the particle size distribution range, and is determined from the numerical distribution of the particle diameter, both of which are [Measured in nm, greater than 1.85, pertaining to the preparation of chromium dioxide.

Description

자기기록매체Magnetic recording medium

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

Claims (3)

비자성 물질 및 적어도 하나의 자성층을 구비하여 폴리머 결합제 및 첨가제에서 균일하게 분포된 뾰족한 크로뮴 이산화물을 함유하며 적어도 60KA/m의 보자력을 갖는 자기 기록 매체에 있어서, 크로뮴 이산화물의 평균입자 길이는 300nm이하이며, 이수 HD는 다음식In a magnetic recording medium having a non-magnetic material and at least one magnetic layer and uniformly distributed pointed chromium dioxide in the polymer binder and the additive, and having a coercive force of at least 60 KA / m, the average particle length of the chromium dioxide is 300 nm or less. , HD is the following formula 으로서, 여기서 KT는, 380KA/m의 외부장에서 측정된, [KA/m]의 자성층의 보자력이며, L은 평균입자 길이이며 ㅿL은 입자 길이의 수치분산으로부터 결정되며 입자크기분산의 영역으로서, L 및 ㅿL은 모두 [nm]로 측정되며, 상기 HD는 1.85인 것을 특징으로 하는 자기 기록 매체.Where KT is the coercive force of the magnetic layer of [KA / m], measured at an external field of 380 KA / m, L is the average particle length and ㅿ L is determined from the numerical dispersion of the particle length and is the area of particle size dispersion. , L and ㅿ L are both measured in [nm] and the HD is 1.85. 제1항에 있어서, 상기 인수 HD는 1.85 내지 4.0인 것을 특징으로 하는 자기 기록 매체.2. The magnetic recording medium of claim 1, wherein the factor HD is 1.85 to 4.0. 철 및 텔루륨 또는 안티모니와 함께 변형되고, 이산화크롬을 주성분으로 하여 이산화철 및 산화텔류륨 또는 안티모니 화합물중 0.05 내지 10중량%가 첨가된 수용성 CrO3현탁액을 반응시킴으로써, 그리고 최소한 70바 하에서 250 내지 400℃의 유기환원제의 산화물 중에 형성된 물의 양을 고려하여 물 1부당 사용된 CrO31.54 내지 2.32 중량부, 4:2 내지 1:1의 Cr(VI);Cr(Ⅲ)의 비를 형성하기 위한 유기 환원제를 반응시킴으로써, 60KA/m보다 큰 보자력과, 85m Tm3/g보다 큰 포화자기화와 300nm보다 작은 평균입경의 작은 입경분포를 가지게 됨을 특징으로 하는 이산화크롬 준비공정.By reacting a water-soluble CrO 3 suspension modified with iron and tellurium or antimony and added with 0.05 to 10% by weight of iron dioxide and tellurium oxide or antimony compound with chromium as a main component, and at least under 70 bar Considering the amount of water formed in the oxide of the organic reducing agent at 250-400 ° C., a ratio of 1.54 to 2.32 parts by weight of CrO 3 used and Cr (VI) of 4: 2 to 1: 1; Cr (III) was formed per part of water. A reaction process for preparing chromium dioxide, characterized by having a coercive force greater than 60 KA / m, a saturation magnetization greater than 85 m Tm 3 / g, and a small particle size distribution with an average particle size smaller than 300 nm. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930002048A 1993-02-13 1993-02-13 Magnetic recording media KR100282008B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930002048A KR100282008B1 (en) 1993-02-13 1993-02-13 Magnetic recording media

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Application Number Priority Date Filing Date Title
KR1019930002048A KR100282008B1 (en) 1993-02-13 1993-02-13 Magnetic recording media

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KR940020310A true KR940020310A (en) 1994-09-15
KR100282008B1 KR100282008B1 (en) 2001-02-15

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