Polyethylene-2,6-naphthalate film for magnetic recording tapes

Details Polyethylene-2,6-naphthalate film for magnetic recording tapes Polyethylene-2,6-naphthalate film for magnetic recording tapes

Filed on

1986-12-09

Date issued

1989-02-14

Examiner

Anderson, Harold D.

Patent Class

Synthetic resins or natural rubbers -- part of the class 520 ser

SubClass

Synthetic resins

SubSubClass

From phenol, phenol ether, or inorganic phenolate

Other Related Categories

428480, 428409, 428694, 427129, 26417719, C08G 6300, C08G 6322, B32B 2706

Type

Patent

Status

active

Patent number

048047368

Description

ABSTRACT:
Disclosed herein is a polyethylene-2,6-naphthalate film suitable for magnetic recording tapes and, in particular, a polyethylene-2,6-naphthalate film suitable for a base film of high-density magnetic recording tapes, having a Young's modulus of not less than 800 kg/mm.sup.2 in the machine direction (the longitudinal direction) and of not less than 600 kg/mm.sup.2 in the transverse direction.

REFERENCES:
patent: 3821156 (1974-06-01), Farrar
patent: 4202927 (1980-05-01), Yamaguchi et al.
patent: 4316927 (1982-02-01), Kimura et al.
patent: 4461797 (1984-07-01), Adachi et al.
patent: 4497865 (1985-02-01), Minami et al.
European Search Report (Apr. 28, 1987).

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