KR960035451A - Magnetic recording medium and manufacturing method thereof - Google Patents

Magnetic recording medium and manufacturing method thereof Download PDF

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Publication number
KR960035451A
KR960035451A KR1019950006506A KR19950006506A KR960035451A KR 960035451 A KR960035451 A KR 960035451A KR 1019950006506 A KR1019950006506 A KR 1019950006506A KR 19950006506 A KR19950006506 A KR 19950006506A KR 960035451 A KR960035451 A KR 960035451A
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KR
South Korea
Prior art keywords
magnetic
recording medium
magnetic layer
magnetic recording
binder
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Application number
KR1019950006506A
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Korean (ko)
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KR100362752B1 (en
Inventor
아쓰시 가또
유지 가또
하루오 이시자끼
다까히로 다까야마
Original Assignee
오가 노리오
소니 가부시기가이샤
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Priority to KR1019950006506A priority Critical patent/KR100362752B1/en
Publication of KR960035451A publication Critical patent/KR960035451A/en
Application granted granted Critical
Publication of KR100362752B1 publication Critical patent/KR100362752B1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/702—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent
    • G11B5/7021—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent containing a polyurethane or a polyisocyanate
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/716—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by two or more magnetic layers

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

제1자성층(2)과 제2자성층(4)과를 적층하고, 하층의 제1자성층(2)의 결합제를 3급 아민을 극성기(極性基)로 하는 폴리우레탄수지 또는 이 수지와 경화제만으로 하고, 또는 3급 아민을 극성기로 하는 폴리우레탄수지와 아민변성염화비닐계 수지 또는 이들 수지와 경화제를 병용하는 자기기록매체, 제1자성층(2)에 특정 범위의 평균입자경 등을 가지는 카본블랙을 함유하는 자기기록매체.The first magnetic layer 2 and the second magnetic layer 4 are laminated, and the binder of the lower first magnetic layer 2 is made of only polyurethane resin having a tertiary amine as a polar group or a resin and a curing agent. Or carbon black having a specific range of average particle diameter in the first magnetic layer 2 or the magnetic recording medium in which a polyurethane resin having a tertiary amine as a polar group and an amine modified vinyl chloride-based resin or a combination of these resins and a curing agent are contained. Magnetic recording media.

자성도료의 코팅성이 좋아지고, 전자(電磁)변환특성(특히 비디오 S/N, 크로마출력, 크로마 S/N)이 개량된다. 또한, 가교성이 향상함으로써, 보존 후의 드롭아웃의 증가에 대하여 보다 효과적이다. 따라서, 본 발명에 의하면, 보다 엄격한 환경하에 있어서도, 장시간에 걸쳐서 고품질의 기록 · 재생을 행하는 자기기록매체의 제공이 가능하게 된다. 또, 전기저항, 광투과율, 주행내구성 등도 백코드층 없이도 양호하게 할 수 있다.The coating property of the magnetic paint is improved, and the electron conversion characteristics (especially video S / N, chroma output, chroma S / N) are improved. In addition, the crosslinkability is improved, which is more effective against an increase in dropout after storage. Therefore, according to the present invention, it is possible to provide a magnetic recording medium which records and reproduces high quality over a long time even in a more stringent environment. In addition, electrical resistance, light transmittance, running durability and the like can also be improved without a back cord layer.

Description

자기기록매체 및 그 제조방법Magnetic recording medium and manufacturing method thereof

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

제1도는 본 발명에 의한 자기기록매체의 일예의 단면도, 제2도는 본 발명에 의한 자기기록매체의 다른 예의 단면도.1 is a cross-sectional view of one example of a magnetic recording medium according to the present invention, and FIG. 2 is a cross-sectional view of another example of a magnetic recording medium according to the present invention.

Claims (10)

비자성(比磁性) 지지체상에, 자성분말을 결합제중에 분산시킨 제1자성층 및 제2자성층을 이 순으로 배설하여 이루어지는 자기기록매체에 있어서, 상기 제1자성층의 결합제가 3급 아민을 극성기(極性基)로서 가지는 폴리우레탄수지로 이루어지는 것을 특징으로 하는 자기기록매체.In a magnetic recording medium in which a first magnetic layer and a second magnetic layer in which magnetic powders are dispersed in a binder are disposed in this order on a nonmagnetic support, the binder of the first magnetic layer may contain a tertiary amine as a polar group ( A magnetic recording medium comprising a polyurethane resin having a resinous base. 제1항에 있어서, DBP 흡유량(吸油量)이 30~150㎖/100g, 평균입자경이 5~150㎚, BET법에 의한 비표면적(比表面積)이 40~300㎡/g인 카본블랙이 제1자성층에 함유되어 있는 것을 특징으로 하는 자기기록매체.The carbon black according to claim 1, wherein the DBP oil absorption is 30 to 150 ml / 100 g, the average particle diameter is 5 to 150 nm, and the specific surface area of the BET method is 40 to 300 m 2 / g. A magnetic recording medium which is contained in one magnetic layer. 제1항 또는 제2항에 있어서, 제1자성층의 결합제가 3급 아민을 극성기로서 가지는 폴리우레탄수지와, 아민계의 극성기를 가지는 염화비닐계 수지로 이루어지는 것을 특징으로 하는 자기기록매체.The magnetic recording medium according to claim 1 or 2, wherein the binder of the first magnetic layer is composed of a polyurethane resin having a tertiary amine as a polar group and a vinyl chloride resin having an amine polar group. 제1항~제3항 중 어느 한 항에 있어서, 3급 아민으로 이루어지는 극성기가 10-7~10-2몰/g의 비율로 폴리우레탄수지에 함유되어 있는 것을 특징으로 하는 자기기록매체.The magnetic recording medium according to any one of claims 1 to 3, wherein the polar group consisting of tertiary amines is contained in the polyurethane resin at a ratio of 10 -7 to 10 -2 mol / g. 제3항 또는 제4항에 있어서, 아민계의 극성기가 10-6~10-3몰/g의 비율로 염화비닐계 수지에 함유되어 있는 것을 특징으로 하는 자기기록매체.The magnetic recording medium according to claim 3 or 4, wherein the amine polar group is contained in the vinyl chloride resin at a ratio of 10 -6 to 10 -3 mol / g. 제3항~제5항 중 어느 한 항에 있어서, 제1자성층중의 폴리우레탄수지의 함유량은 결합제 전량의 50중량% 이상을 차지하는 것을 특징으로 하는 자기기록매체.The magnetic recording medium according to any one of claims 3 to 5, wherein the content of the polyurethane resin in the first magnetic layer accounts for 50% by weight or more of the total amount of the binder. 제1항~제6항 중 어느 한 항에 있어서, 제1자성층에, 경화제가 결합제 100중량부에 대하여 0~30중량부의 비율로 함유되는 것을 특징으로 하는 자기기록매체.The magnetic recording medium according to any one of claims 1 to 6, wherein the first magnetic layer contains a curing agent in a proportion of 0 to 30 parts by weight with respect to 100 parts by weight of the binder. 제1항~제7항 중 어느 한 항에 있어서, 제2자성층은 제1자성층의 상층으로 배설되고, 이 제1자성층의 자성분말보다 비표면적이 큰 자성분말을 함유하고, 또한 충분한 내구성을 가지고 있는 것을 특징으로 하는 자기기록매체.The magnetic material according to any one of claims 1 to 7, wherein the second magnetic layer is disposed on the upper layer of the first magnetic layer, contains a magnetic powder having a specific surface area larger than that of the first magnetic layer, and has sufficient durability. Magnetic recording medium, characterized in that. 제1항~제8항 중 어느 한 항에 있어서, 자성층을 배설한 면과는 반대측의 비자성지지체의 표면이 노출되어 있는 것을 특징으로 하는 자기기록매체.The magnetic recording medium according to any one of claims 1 to 8, wherein the surface of the nonmagnetic support on the side opposite to the surface on which the magnetic layer is disposed is exposed. 제1자성층에 첨가하는 카본블랙을 결합제와 함께 유기용매중에 미리 분산시켜 슬러리형으로 하고, 이 슬러리형 혼합물을 상기 제1자성층용의 자성도료의 분산종료시에 첨가하는 것을 특징으로 하는 제1항~제9항 중 어느 한 항에 기재된 자기기록매체의 제조방법.The carbon black added to the first magnetic layer is previously dispersed in an organic solvent together with a binder to form a slurry, and the slurry mixture is added at the end of dispersing the magnetic coating for the first magnetic layer. The method of manufacturing a magnetic recording medium according to any one of claims 9 to 11. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950006506A 1995-03-27 1995-03-27 Magnetic recording medium and its manufacturing method KR100362752B1 (en)

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KR1019950006506A KR100362752B1 (en) 1995-03-27 1995-03-27 Magnetic recording medium and its manufacturing method

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Application Number Priority Date Filing Date Title
KR1019950006506A KR100362752B1 (en) 1995-03-27 1995-03-27 Magnetic recording medium and its manufacturing method

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Publication Number Publication Date
KR960035451A true KR960035451A (en) 1996-10-24
KR100362752B1 KR100362752B1 (en) 2003-02-19

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0156576B1 (en) * 1989-12-27 1998-12-15 다끼사와 다께시 Binder for powder and magnetic recording media using the same

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