FR2257403A1 - Biaxially oriented polyethylene-2,6-naphthoate film - of high Youngs modulus-tensile strength, and uniform thickness for magnetic tape - Google Patents

Biaxially oriented polyethylene-2,6-naphthoate film - of high Youngs modulus-tensile strength, and uniform thickness for magnetic tape

Info

Publication number
FR2257403A1
FR2257403A1 FR7417818A FR7417818A FR2257403A1 FR 2257403 A1 FR2257403 A1 FR 2257403A1 FR 7417818 A FR7417818 A FR 7417818A FR 7417818 A FR7417818 A FR 7417818A FR 2257403 A1 FR2257403 A1 FR 2257403A1
Authority
FR
France
Prior art keywords
film
naphthoate
biaxially oriented
oriented polyethylene
tensile strength
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
FR7417818A
Other languages
French (fr)
Other versions
FR2257403B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teijin Ltd
Original Assignee
Teijin Ltd
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.)
Filing date
Publication date
Application filed by Teijin Ltd filed Critical Teijin Ltd
Publication of FR2257403A1 publication Critical patent/FR2257403A1/en
Application granted granted Critical
Publication of FR2257403B1 publication Critical patent/FR2257403B1/fr
Granted legal-status Critical Current

Links

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
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73923—Organic polymer substrates
    • G11B5/73927—Polyester substrates, e.g. polyethylene terephthalate
    • G11B5/73929—Polyester substrates, e.g. polyethylene terephthalate comprising naphthalene ring compounds, e.g. polyethylene naphthalate substrates

Abstract

Biaxially oriented polyethylene-2,6-naphthoate, film has a Young's modulus of >=100,00 esp. 120,000 kg/cm2 in the longitudinal direction, and an R value of =0.50 at any point selected in the transverse direction. The value of R is obtd. by (a) removing a sample with a length of >=10 cm in the transverse direction, and any desired length in the longitudinal direction, from any place in the film, (b) drawing indicator lines in the longitudinal direction of the sample at intervals of 2.5 cm, (c) continuously measuring the thickness of the sample in the transverse direction, (d) determining the average thickness, and the difference between the max. thickness and the min. thickness in each sector defined by two adjacent indicator lines, and (e) dividing the average value of these differences by the average thickness.
FR7417818A 1974-01-11 1974-05-22 Biaxially oriented polyethylene-2,6-naphthoate film - of high Youngs modulus-tensile strength, and uniform thickness for magnetic tape Granted FR2257403A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP49006016A JPS50102303A (en) 1974-01-11 1974-01-11

Publications (2)

Publication Number Publication Date
FR2257403A1 true FR2257403A1 (en) 1975-08-08
FR2257403B1 FR2257403B1 (en) 1976-12-24

Family

ID=11626892

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7417818A Granted FR2257403A1 (en) 1974-01-11 1974-05-22 Biaxially oriented polyethylene-2,6-naphthoate film - of high Youngs modulus-tensile strength, and uniform thickness for magnetic tape

Country Status (5)

Country Link
JP (1) JPS50102303A (en)
BE (1) BE815395A (en)
DE (1) DE2424466A1 (en)
FR (1) FR2257403A1 (en)
NL (1) NL7406918A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0229255A2 (en) * 1985-11-13 1987-07-22 Diafoil Hoechst Co., Ltd Polyethylene naphthalate film
EP0237954A2 (en) * 1986-03-20 1987-09-23 Sony Corporation A magnetic recording medium having an extremely thin total thickness
WO1989004854A1 (en) * 1987-11-23 1989-06-01 Eastman Kodak Company Polymer blends useful for hot fillable containers having improved gas barrier properties

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134442B (en) * 1983-01-18 1987-05-28 Diafoil Co Ltd Polyester film for magnetic recording media
JPS6126923A (en) * 1984-07-17 1986-02-06 Tdk Corp Magnetic recording medium
JPH0628098B2 (en) * 1985-07-23 1994-04-13 帝人株式会社 Magnetic recording tape
JPS62135339A (en) * 1985-12-09 1987-06-18 Diafoil Co Ltd Polyethylene-2,6-naphthalate film for magnetic recording medium
US5051292A (en) * 1989-02-01 1991-09-24 Teijin Limited Biaxially oriented film of polyethylene-2,6-naphthalate
JPH0677472U (en) * 1991-07-08 1994-10-28 ジェコー株式会社 Brush holder holding structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0229255A2 (en) * 1985-11-13 1987-07-22 Diafoil Hoechst Co., Ltd Polyethylene naphthalate film
EP0229255A3 (en) * 1985-11-13 1988-08-03 Diafoil Company, Limited Polyethylene naphthalate film
EP0237954A2 (en) * 1986-03-20 1987-09-23 Sony Corporation A magnetic recording medium having an extremely thin total thickness
EP0237954A3 (en) * 1986-03-20 1989-09-27 Sony Corporation A magnetic recording medium having an extremely thin total thickness
WO1989004854A1 (en) * 1987-11-23 1989-06-01 Eastman Kodak Company Polymer blends useful for hot fillable containers having improved gas barrier properties

Also Published As

Publication number Publication date
JPS50102303A (en) 1975-08-13
BE815395A (en) 1974-09-16
DE2424466A1 (en) 1975-07-31
NL7406918A (en) 1975-07-15
FR2257403B1 (en) 1976-12-24

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Legal Events

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