POLYESTER FILM FOR USE IN MAGNETIC RECORDING MATERIAL

Title:

POLYESTER FILM FOR USE IN MAGNETIC RECORDING MATERIAL

Document Type and Number:

Japanese Patent JPS58215723

Kind Code:

A

Abstract:

PURPOSE: To obtain the titled film capable of high-density recording and superiror in traveling performance, by regulating height of an average surface protuberance to a specified value or less, and its friction coefft. in a specified range.

CONSTITUTION: The present polyester film is prepared by using terephthalic acid 2,6-naphthalenedicarboxylic acid, or any of their alkyl esters, and ethylene glycol as starting materials, and when needed, another material as the third structural units. Its average surface protuberance height is ≤9nm, and its friction coefft. is 0.3W1.3. As a result, the obtained polyester film is superior in traveling performance, and capable of high-density magnetic recording, and suitable for use in a video magnetic tape, magnetic video disc, floppy disc, etc.

Inventors:

KAGIYAMA TAKASHI
OTONARI SATOSHI
IKUSHIMA KOUICHIROU
OKUMURA NORIO

Application Number:

JP9812282A

Publication Date:

December 15, 1983

Filing Date:

June 08, 1982

Export Citation:

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Assignee:

DAIAFOIL

International Classes:

B29C49/00; B29C55/00; B29C55/12; C08J5/18; C08L67/02; G11B5/73; (IPC1-7): B29D7/24; G11B5/70

Domestic Patent References:

JPS54157155A	1979-12-11
JPS5690423A	1981-07-22

Attorney, Agent or Firm:

Hasegawa Hajime

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