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KR970002914A - Base film for magnetic recording media and its manufacturing method - Google Patents

Base film for magnetic recording media and its manufacturing method Download PDF

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Publication number
KR970002914A
KR970002914A KR1019950015770A KR19950015770A KR970002914A KR 970002914 A KR970002914 A KR 970002914A KR 1019950015770 A KR1019950015770 A KR 1019950015770A KR 19950015770 A KR19950015770 A KR 19950015770A KR 970002914 A KR970002914 A KR 970002914A
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KR
South Korea
Prior art keywords
magnetic recording
base film
polyester
recording medium
recording media
Prior art date
Application number
KR1019950015770A
Other languages
Korean (ko)
Other versions
KR0157177B1 (en
Inventor
이재웅
한준희
Original Assignee
안시환
주식회사 에스 · 케이 · 씨
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 안시환, 주식회사 에스 · 케이 · 씨 filed Critical 안시환
Priority to KR1019950015770A priority Critical patent/KR0157177B1/en
Priority to US08/662,862 priority patent/US5718860A/en
Priority to JP8154431A priority patent/JPH09117960A/en
Publication of KR970002914A publication Critical patent/KR970002914A/en
Application granted granted Critical
Publication of KR0157177B1 publication Critical patent/KR0157177B1/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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/733—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the addition of non-magnetic particles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73923—Organic polymer substrates
    • G11B5/73927—Polyester substrates, e.g. polyethylene terephthalate

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

본 발명은 자기기록 매체용 기재 필름 및 그 제조 방법에 관한 것이다. 무기활제를 함유하고 있는 자기기록 매체용 기재필름에 있어서, 이축배향 폴리에스테르 필름의 양면중, 자성체가 도포될 면의 표면 결정화도가 50 내지 70%이고, 도포되지 않는 면의 표면결정화도가 40 내지 60%이며, 상기 양면의 표면결정화도 차이가 5% 이상이 되는 것을 특징을 하는 자기기록 매체용 기재 필름은 자성체와의 접촉강도와 비도포면의 내마모성 모두가 우수하다.The present invention relates to a base film for magnetic recording media and a method of manufacturing the same. In the base film for magnetic recording medium containing an inorganic lubricant, the surface crystallinity of the surface on which the magnetic material is to be applied is 50 to 70% of both surfaces of the biaxially oriented polyester film, and the surface crystallinity of the surface to which the non-coating is 40 to 60 is applied. %, The surface crystallinity difference between the two surfaces is 5% or more, the base film for a magnetic recording medium is excellent in both contact strength with the magnetic material and wear resistance of the uncoated surface.

Description

자기기록 매체용 기재 필름 및 그 제조 방법Base film for magnetic recording media and its manufacturing method

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

Claims (10)

무기활제를 함유하고 있는 자기기록 매체용 기재 필름에 있어서, 이축배향 폴리에스테르 필름의 양면중,자성체가 도포될 면의 표면 결정화도가 50 내지 70%이고, 도포되지 않는 면의 표면결정화도가 40 내지 60%이며, 상기 양면의 표면결정화도 차이가 5% 이상이 되는 것을 특징을 하는 자기기록 매체용 기재 필름.In the base film for magnetic recording media containing an inorganic lubricant, the surface crystallinity of the surface on which the magnetic material is to be applied is 50 to 70% of both surfaces of the biaxially oriented polyester film, and the surface crystallinity of the surface to which the non-coating is 40 to 60 is applied. %, The difference in surface crystallinity of both surfaces is 5% or more. 제1항에 있어서, 상기 폴리에스테르는 주반복 단위의 80% 이상이 에틸렌테레프탈레이트인 것을 특징으로 하는 자기기록 매체용 기재 필름.The base film for magnetic recording media according to claim 1, wherein at least 80% of the main repeating units of the polyester are ethylene terephthalate. 제1항에 있어서, 상기 무기활제는 탄산칼슘 및 구상형 실리카로 이루어진 군에서 선택된 적어도 하나인 것을 특징으로 하는 자기기록 매체용 기재 필름.The base film for a magnetic recording medium according to claim 1, wherein the inorganic lubricant is at least one selected from the group consisting of calcium carbonate and spherical silica. 제3항에 있어서, 상기 탄산칼슘은 평균입경이 0.05 내지 3.0㎛이고, 상기 폴리에스테르를 기준으로 0.01내지 0.5중량%인 것을 특징으로 하는 자기기록 매체용 기재 필름.4. The base film for magnetic recording media according to claim 3, wherein the calcium carbonate has an average particle diameter of 0.05 to 3.0 mu m and is 0.01 to 0.5 wt% based on the polyester. 제3항에 있어서, 상기 구상형 실리카는 평균입경이 0.05 내지 3.0㎛이고, 상기 폴리에스테르를 기준으로0.01 내지 0.5중량%인 것을 특징으로 하는 자기기록 매체용 기재 필름.4. The base film for magnetic recording media according to claim 3, wherein the spherical silica has an average particle diameter of 0.05 to 3.0 mu m and is 0.01 to 0.5 wt% based on the polyester. 무기활제를 함유하는 폴리에스테르 수지를 용융압출하여 폴리에스테르 쉬트를 제조하는 단계; 상기 폴리에스테르 쉬트를 종, 횡방향으로 2.5 내지 6.0배 연신하는 단계; 및 상기 이축연신된 필름을 열고정하는 단계를 포함하는자기기록 매체용 기재 필름의 제조 방법에 있어서, 상기 열고정은 자성체가 도포될 면에 대해 170 내지 270℃의 범위에서1 내지 50초 동안, 자성체가 도포되지 않는 면에 대해 150 내지 250℃의 범위에서 1 내지 200초 동안 수행되는 것을 특징으로 하는 방법.Melting and extruding a polyester resin containing an inorganic lubricant to prepare a polyester sheet; Stretching the polyester sheet 2.5 to 6.0 times in the longitudinal and transverse directions; And heat-setting the biaxially stretched film, wherein the heat-setting is performed for 1 to 50 seconds in a range of 170 to 270 ° C with respect to the surface on which the magnetic body is to be applied. Characterized in that it is carried out for 1 to 200 seconds in the range of 150 to 250 ℃ for the uncoated side. 제6항에 있어서, 상기 폴리에스테르는 주반복 단위의 80% 이상이 에틸렌테레프탈레이트인 것을 특징으로 하는 자기기록 매체용 기재 필름의 제조 방법.The method of manufacturing a base film for magnetic recording medium according to claim 6, wherein at least 80% of the main repeating units of the polyester are ethylene terephthalate. 제7항에 있어서, 상기 무기활제는 탄산칼슘 및 구상형 실리카로 이루어진 군에서 선택된 적어도 하나인 것을 특징으로 하는 자기기록 매체용 기재 필름의 제조 방법.The method of manufacturing a base film for magnetic recording medium according to claim 7, wherein the inorganic lubricant is at least one selected from the group consisting of calcium carbonate and spherical silica. 제8항에 있어서, 상기 탄산칼슘은 평균입경이 0.05 내지 3.0㎛이고, 상기 폴리에스테르를 기준으로 0.01내지 0.5중량% 첨가되는 것을 특징으로 하는 자기기록 매체용 기재 필름의 제조 방법.The method for producing a base film for a magnetic recording medium according to claim 8, wherein the calcium carbonate has an average particle diameter of 0.05 to 3.0 mu m and is added in an amount of 0.01 to 0.5 wt% based on the polyester. 제8항에 있어서, 상기 구상형 실리카는 평균입경이 0.05 내지 3.0㎛이고, 상기 폴리에스테르를 기준으로0.01 내지 0.5중량% 첨가되는 것을 특징으로 하는 자기기록 매체용 기재 필름의 제조 방법.The method for manufacturing a base film for a magnetic recording medium according to claim 8, wherein the spherical silica has an average particle diameter of 0.05 to 3.0 mu m and is added in an amount of 0.01 to 0.5 wt% based on the polyester. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950015770A 1995-06-14 1995-06-14 Base film for magnetic recording media and its manufacturing method KR0157177B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019950015770A KR0157177B1 (en) 1995-06-14 1995-06-14 Base film for magnetic recording media and its manufacturing method
US08/662,862 US5718860A (en) 1995-06-14 1996-06-12 Process for the preparation of polyester base film for magnetic recording media
JP8154431A JPH09117960A (en) 1995-06-14 1996-06-14 Manufacture of polyester substrate film for magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950015770A KR0157177B1 (en) 1995-06-14 1995-06-14 Base film for magnetic recording media and its manufacturing method

Publications (2)

Publication Number Publication Date
KR970002914A true KR970002914A (en) 1997-01-28
KR0157177B1 KR0157177B1 (en) 1998-12-15

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KR1019950015770A KR0157177B1 (en) 1995-06-14 1995-06-14 Base film for magnetic recording media and its manufacturing method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100558566B1 (en) * 1998-01-03 2006-06-16 도레이새한 주식회사 Biaxially Stretched Polyester Film for Magnetic Recording Media

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100558566B1 (en) * 1998-01-03 2006-06-16 도레이새한 주식회사 Biaxially Stretched Polyester Film for Magnetic Recording Media

Also Published As

Publication number Publication date
KR0157177B1 (en) 1998-12-15

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